公告版位


各位看倌是否瞭解呢?
美國億萬富翁、激進投資者卡爾·伊坎(Carl Icahn)已經收購了部分雅虎股份。
並有意發動代理權爭奪戰,
更換至少部分雅虎董事,
為的是給雅虎增壓力,
讓雅虎重啟同微軟的併購談判。
雅虎投資者在週 四前可以向董事會提出董事會成員候選人,
雅虎董事會10名組成人員今年都將在年度股東大會上進行重選。
雅虎將於今年7月份舉行股東大會。
不過雅虎管理層並 不太擔心代理權爭奪戰,
因為他們相信反對方無法獲得足夠多的股份支援。
雅虎聯合創始人楊致遠和David Filo共持有公司近10%的股份。
而版大個人則是認為,
他只不過希望賺更多的錢罷了,
希望微軟收購雅虎只不過是因為,
雅虎股價跌了他不爽想要大賺一筆罷了,
只是趁低收購被發現了~哈哈~
各位擺張凳子再多喝咖啡吧!
[資料來源]


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Porsche SE
Type Public
(Xetra: POR3)
(FWB: POR3)
Founded 1931: by Ferdinand Porsche and Ferry Porsche
Headquarters Flag of Germany Stuttgart, Germany
Key people Flag of Germany Dr. Wendelin Wiedeking, CEO and President
Products Automobiles
Revenue 7.273 billion (2006), 6.57 billion (2005)
Employees 11,910
Website porsche.com

Porsche SE, or just Porsche, is a German manufacturer of automobiles majority owned by the Porsche and Piëch families. Porsche SE holds two chief assets, the first of which is Dr. Ing. h.c. F. Porsche AG, often shortened to Porsche AG, manufacturer of the Porsche automobile line. The second asset is a large stake in Volkswagen AG.

It was founded in 1931 by Ferdinand Porsche, an Austro-Hungarian engineer, born in Maffersdorf, Austria-Hungary (today Vratislavice, Czech Republic) who also designed the first Volkswagen. The company is headquartered in Zuffenhausen, a city district of Stuttgart, Baden-Württemberg. They currently produce 911 (997), Boxster, and Cayman sports cars and Cayenne sport utility vehicles.

[edit] Reputation

1953 Porsche 356 American Roadster

1953 Porsche 356 American Roadster
1976 Porsche 911 Turbo Type 930

1976 Porsche 911 Turbo Type 930
2005 Porsche 911 (997) Carrera S

2005 Porsche 911 (997) Carrera S

In a May 2006 survey, Porsche was awarded the title of the most prestigious automobile brand by Luxury Institute, New York; it questioned more than 500 households with a gross annual income of at least US $200,000 and a net worth of at least US $720,000.[1] The current Porsche lineup includes sports cars from the Boxster roadster to their most famous product, the 911. The Cayman is a hard top car similar to the Boxster in a slightly higher price range. The Cayenne is Porsche's mid-size luxury SUV. The Carrera GT supercar was phased out in May 2006. Future plans include a high performance luxury saloon/sedan, the Panamera.

Porsche was awarded the 2006 J.D. Power and Associates award for highest Nameplate Initial Quality Study (IQS) of automobile brands.[2]

As a company, Porsche is known for weathering changing market conditions with great financial stability, while retaining most production in Germany during an age when most other German car manufacturers have moved at least parts of their production to Eastern Europe or overseas.[citation needed] The headquarters and main factory are still in Stuttgart-Zuffenhausen, but the Cayenne (and formerly the Carrera GT) is manufactured in Leipzig, Germany, the SUV also in Bratislava, Slovakia. Most Boxster and Cayman production is outsourced to Valmet Automotive in Finland. The company has been highly successful in recent times, and indeed claims to have the highest profit per unit sold of any car company in the world.[3]

Porsche has for many years offered consultancy services to various other car manufacturers. Audi, Studebaker, SEAT, Daewoo, Subaru and Yugo have consulted Porsche on engineering for their cars or engines. The Lada Samara[4] was partly developed by Porsche in 1984. Porsche also helped Harley-Davidson design their new engine in their newer V-Rod motorcycle.

[edit] Competitors

See also Auto racing, further down in this article.

In racing, Porsche's main rival has traditionally been Ferrari, though their production vehicles appeal to quite different personalities, if similar demographics. The rivalry is therefore primarily because of both companies' storied racing heritage and the fact that some of their vehicles are of comparable performance. Porsche has a reputation for offering equal or higher performing cars than the more expensive Ferrari models, while overall Ferrari sells far fewer cars at much higher prices (for example, there are no Ferraris under US $100,000, while several Porsches are priced below that figure).

In the daily-driver marketplace, Porsche's traditional rivals are its fellow German automakers Mercedes-Benz, Audi, and BMW (the Boxster competes directly with the BMW Z4 and the Mercedes-Benz SLK, for instance), as well as Lotus, Jaguar, and Maserati. Ferrari, on the other hand, competes more directly with firms such as Lamborghini, Bugatti and Pagani.

[edit] History

Professor Ferdinand Porsche initially started the company called "Dr. ing. h. c. F. Porsche GmbH" in 1931, with main offices at Königstrasse in the center of Stuttgart. The company offered motor vehicle development work and consulting, and did not initially build any cars under its own name. One of the first assignments the new company received was from the German government to design a car for the people, a "Volkswagen" in German.

The first Porsche, the Porsche 64, was developed in 1939 using many components from the Volkswagen Beetle. The Beetle was first called Type 12 in 1931 then Porsche 60. The name was not used until 1967 by Porsche/VW. During World War II Volkswagen production turned to the military version of the Volkswagen Beetle, the Kübelwagen, 52,000 produced and saw action in all German fronts and Schwimmwagen, 14,000 produced. During a contract bid for a new tank Porsche lost to Henschel & Son who subsequently produced the Tiger I. Ferdinand Porsche was hurt by this, knowing Adolf Hitler personally. Porsche would assist in the designing of the Tiger tank series and the Elefant tank.

After the war Ferdinand designs Beetle to the French as war reparations. Volkswagen factory fell inside the British occupied zone. Ferdinand lost ownership of Volkswagen and a British major, Ivan Hirst was put in charge. Ferdinand was not allowed at the reopening of the Volkswagen factory. December 15 the same year (1945) Ferdinand was arrested but was not tried for war crimes. During his 20 month imprisonment, Ferdinand Porsche's son, Ferry Porsche, decided to build his own car because he could not find an existing one that he would buy. The first models of what was to become the 356 were built in a small sawmill in Gmünd, Austria and had aluminum bodywork, hence the modern Porsche company was born. The prototype car was shown to German auto dealers, and when pre-orders reached a set threshold, production was begun. Many regard the 356 as the first Porsche simply because it was the first model sold by the fledgling company. Porsche commissioned Zuffenhausen-based company Reutter Carosseri, which had previously collaborated with Porsche on Volkswagen Beetle prototypes, to produce the 356's steel body. Porsche constructed an assembly plant across the street from Reutter Carosseri; that assembly plant is now known as Porschestrasse. The 356 was road certified in 1948.

Not long afterwards, on January 30, 1951, Ferdinand Porsche died from complications following a stroke.

In post-war Germany parts were generally in short supply, so the 356 automobile used components from the Volkswagen Beetle including its engine, gearbox, and suspension. The 356, however, had several evolutionary stages, A, B, and C, while in production and many VW parts were replaced by Porsche-made parts. The last 356s were powered by entirely Porsche-designed engines. The sleek bodywork was designed by Erwin Komenda who also had designed the body of the Beetle. Porsche's signature designs have, from the beginning, featured air-cooled rear-engine configurations (like the Beetle), rare for other car manufacturers, but producing automobiles that are very well balanced.

In 1964, after some success in motor-racing, namely with the Porsche 550 Spyder, the company launched the Porsche 911 another air-cooled, rear-engined sports car, this time with a 6-cylinder "boxer" engine. The team to lay out the body shell design was led by Ferry Porsche's eldest son, Ferdinand Alexander Porsche (F. A.). The design phase for the 911 caused internal problems with Erwin Komenda who led the body design department until then. F. A. Porsche complained Komenda made changes to the design not being approved by him. Company leader Ferry Porsche took his son's drawings to neighbouring body shell manufacturer Reuter bringing the design to the 1963 state. Reuter's workshop was later acquired by Porsche (so-called Werk II). Afterward Reuter became a seat manufacturer, today known as Keiper-Recaro.

The design group gave sequential numbers to every project (356, 550, etc) but the designated 901 nomenclature contravened Peugeot's trademarks on all 'x0x' names, so it was adjusted to 911. Racing models adhered to the "correct" numbering sequence: 904, 906, 908. The 911 has become Porsche's most well-known model, successful on the race-track, in rallies, and in terms of sales. Far more than any other model, the Porsche brand is defined by the 911. It remains in production; however, after several generations of revision, current-model 911s share only the basic mechanical concept of a rear-engined, six-cylinder coupe, and basic styling cues with the original car. A cost-reduced model with the same body, but 356-derived running gear (including its four-cylinder engine), was sold as the 912.

The Porsche 912, a Porsche of the 1960s

The Porsche 912, a Porsche of the 1960s

In 1972 the company's legal form was changed from limited partnership to public limited company (AG in German), because Ferry Porsche and his sister, Louise Piëch, felt their generation members did not team up well. This led to the foundation of an executive board whose members came from outside the Porsche family, and a supervisory board consisting mostly of family members. With this change, no family members were in operational charge of the company. F. A. Porsche founded his own design company, Porsche Design, which is renowned for exclusive sunglasses, watches, furniture, and many other luxury articles. Ferdinand Piëch, who was responsible for mechanical development of Porsche's serial and racing cars, formed his own engineering bureau and developed a 5-cylinder-inline diesel engine for Mercedes-Benz. A short time later he moved to Audi and pursued his career through the entire company, up to and including, the Volkswagen Group boards.

The first CEO of Porsche AG was Dr. Ernst Fuhrmann who had been working in Porsche's engine development. Fuhrmann was responsible for the so-called Fuhrmann-engine used in the 356 Carrera models, as well as the 550 Spyder, having four over-head camshafts instead of a central camshaft as in the Volkswagen-derived serial engines. He planned to cease the 911 during the 70s and replace it with the V8-front engined grand sportswagon 928. As we know today the 911 outlived the 928 by far. Fuhrmann was replaced in the early 80s by Peter W. Schutz, an American manager and self-proclaimed 911 aficionado. He was replaced in 1988 by the former manager of German computer company Nixdorf Computer AG, Arno Bohn, who made some costly miscalculations that led to his dismissal soon after, along with that of the development director, Dr. Ulrich Bez, who was formerly responsible for BMW's Z1 model and today is CEO of Aston Martin.

In 1990, Porsche drew up a memorandum of understanding with Toyota to learn and benefit from Japanese production methods. Currently Toyota is assisting Porsche with hybrid technology, rumored to be making its way into a Hybrid Cayenne SUV, as well as the upcoming four-door coupe, the Panamera.

Following the dismissal of Bohn, an interim CEO was appointed, longtime Porsche employee, Heinz Branitzki, who served in that position until Dr. Wendelin Wiedeking became CEO in 1993. Wiedeking took over the chairmanship of the board at a time when Porsche appeared vulnerable to a takeover by a larger company. During his long tenure, Wiedeking has transformed Porsche into a very efficient and profitable company.

Ferdinand Porsche's grandson, Ferdinand Piëch, was chairman and CEO of the Volkswagen Group from 1993 to 2002. Today he is chairman of the supervisory board. With 12.8 per cent of the Porsche voting shares, he also remains the second largest individual shareholder of Porsche AG after his cousin, F. A. Porsche, (13.6 per cent).

Porsche's 2002 introduction of the Cayenne also marked the unveiling of a new production facility in Leipzig, Saxony, which once accounted for nearly half of Porsche's annual output. The Cayenne Turbo S has the second most powerful production engine in Porsche's history, with the most powerful belonging to the Carrera GT.

In 2004, production of the 605 horsepower (451 kW) Carrera GT commenced in Leipzig, and at EUR 450,000 ($440,000 in the United States) it was the most expensive production model Porsche ever built.

As of 2005, the extended Porsche and Piech families controlled all of Porsche AG's voting shares. In early October 2005 the company announced acquisition of an 18.53% stake in Volkswagen AG and disclosed intentions to acquire additional VW shares in the future. As of June 2006, the Porsche AG stake in Volkswagen had risen to 25.1%, giving Porsche a blocking minority, whereby Porsche can veto large corporate decisions undertaken by VW.

In mid-2006, after years of the Boxster (and later the Cayenne) as the dominant Porsche in North America, the 911 regained its position as Porsche's backbone in the region. The Cayenne and 911 have cycled as the top-selling model since. In Germany the 911 clearly outsells the Boxster/Cayman and Cayenne. [5]

[edit] Relationship with Volkswagen

The company has always had a close relationship with Volkswagen Group, and as noted above, the first Porsche cars used many Volkswagen components. The two companies collaborated in 1969 to make the VW-Porsche 914 and 914-6, whereby the 914-6 had a Porsche engine, and the 914 had a Volkswagen engine, in 1976 with the Porsche 912E (USA only) and the Porsche 924, which used many Audi components and was built at an Audi Neckarsulm factory. Most Porsche 944s also were built there although they used far fewer VW components. In other words, Volkswagen was a cheap Porsche, but since 1924 they have risen up to be a leading car power. The Cayenne, introduced in 2002, shares its entire chassis with Volkswagen Touareg, which is built at the factory in Bratislava. Both Audi and Škoda are wholly owned subsidiaries of Volkswagen. In late 2005, Porsche took an 18.65% stake in the Volkswagen Group, further cementing their relationship, and preventing a takeover of Volkswagen, which was rumored at the time. Speculated suitors included DaimlerChrysler AG, BMW, and Renault.

On 26 March 2007, Porsche took its holding of Volkswagen shares to 30.9%, triggering a takeover bid under German law. Porsche formally announced in a press statement that it did not intend to take over Volkswagen (it would set its offer price at the lowest possible legal value), but intended the move to avoid a competitor taking a large stake or to stop hedge funds dismantling VW, which is Porsche's most important partner.[6] Porsche's move comes after the European Union moved against a German law that protected VW from takeovers. Under the so-called "Volkswagen Law", any shareholder in VW cannot exercise more than 20% of the firm's voting rights, regardless of their level of stock holding. The European Court of Justice struck the law down on 23 October 2007, potentially paving the way for a takeover.[7]

[edit] Corporate Restructure

With the Volkswagen stake acquisition, Porsche intends on reforming the company's format, with Dr Ing. h. c. F. Porsche AG becoming a subsidiary of a newly formed holding company called Porsche Automobil Holding SE, so as to separate the operating activities from holding activities of the company. There was an Extraordinary General Meeting for Porsche AG shareholders which took place on June 26, 2007 at the Porsche Arena in Stuttgart, Germany to discuss the change to the company structure. [8]

On 3 March 2008 Porsche set the stage for obtaining a majority stake in the fellow Volkswagen. Porsche sought on 4 March 2008 to allay fears it would attempt to force a merger with Volkswagen.[9]

[edit] Auto racing

Main article: Porsche in motorsport
The Martini Racing blue and green "psychedelic" livery on a 1970 917K. This car raced at Watkins Glen in 1970.

The Martini Racing blue and green "psychedelic" livery on a 1970 917K. This car raced at Watkins Glen in 1970.

Porsche has been successful in many branches of auto racing, scoring a total of more than 28,000 victories. Porsche is currently the world's largest race car manufacturer. In 2006, Porsche built 195 race cars for various international motor sports events. In 2007, Porsche is expected to construct no fewer than 275 dedicated race cars (7 RS Spyder LMP2 prototypes, 37 GT2 spec 911 GT3-RSRs, and 231 911 GT3 Cup vehicles).[10]

[edit] Pronunciation of "Porsche"

Porsche, a German proper name, is correctly pronounced PORSH-eh (IPA: /ˈpɔrʃə/).

Some tend to over-vocalize the e, which results in Por-SCHA (/pɔrˈʃʌ/). Others mistakenly treat the e as silent, a pronunciation rule that applies to most words in English and French, but not in German, producing the monosyllabic porsh (/pɔrʃ/). The most common pronunciation used in the United States is porsh (/pɔrʃ/). The correct pronunciation of "Porsche"

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Bewise Inc. www.tool-tool.com Reference source from the internet.
Volkswagen AG
Type Subsidiary and marque of Volkswagen Group
Founded 1937
Founder German Auto Association[citation needed]
Headquarters Wolfsburg, Germany
Area served Worldwide
Key people Martin Winterkorn,
Chairman of the Board of Management
Industry Automotive industry
Products mainstream Cars
Revenue 73.94 billion (2007)[1]
Operating income 1.94 billion (2007)[1]
Website Volkswagen.com
for Volkswagen cars only

Volkswagen is a German manufacturing brand/marque of motor car/automobile, based in Wolfsburg, Germany. It forms the major component (in volume of sales) of the much larger Volkswagen Group ("Volkswagen Aktiengesellschaft", or "Volkswagen AG"), which is the world's fourth largest car producer after Toyota, Ford, and General Motors respectively.

The Volkswagen name means "people's car" in German, in which it is pronounced [ˈfolksvagən]. Its current tagline or slogan is Das Auto (in English The Car). Its previous German tagline was Aus Liebe zum Automobil, which translates to: Out of Love for the Car, or, For Love of the Automobile, as translated by VW in other languages.

[edit] History

For vehicle timeline tables, see: Volkswagen (timeline)

[edit] Origins in 1930s Germany

Ferdinand Porsche's Type 12 from 1931

Ferdinand Porsche's Type 12 from 1931

Adolf Hitler had a keen interest in cars even though he did not drive. In 1933, shortly after taking over as leader of Germany, he asked Ferdinand Porsche to make changes to his original 1931 design to make it more suited for the working man. Hans Ledwinka discussed his ideas with Ferdinand Porsche, who used many Tatra design features in the 1938 "KdF-Wagen", later known as the VW Käfer - or Volkswagen Beetle. On 22 June 1934, Dr. Ferdinand Porsche agreed to design the "People's Car" for Hitler.

Changes included better fuel efficiency, reliability, ease-of-use, and economically efficient repairs and parts. The intention was that ordinary Germans would buy the car by means of a savings scheme ("Fünf Mark die Woche musst Du sparen, willst Du im eigenen Wagen fahren" — "Save five Marks a week, if you want to drive your own car"), which around 336,000 people eventually paid into. Volkswagen honoured its savings agreements in West Germany (but not in East Germany) after World War II[citation needed]. Prototypes of the car called the "KdF-Wagen" (German: Kraft durch Freude -- "strength through joy"), appeared from 1936 onwards (the first cars had been produced in Stuttgart). The car already had its distinctive round shape and air-cooled, flat-four, rear-mounted engine. The VW car was just one of many KdF programmes which included things such as tours and outings. The prefix "Volks" ("People's") was not just applied to cars, but also to other products in Nazi Germany; the "Volksempfänger" radio receiver for instance. On May 30, 1937, Volkswagen mbH was established.

VW Type 83

VW Type 83

Erwin Komenda, the longstanding Auto Union chief designer, developed the car body of the prototype, which was recognizably the Beetle we know today. It was one of the first to be designed with the aid of a wind tunnel; unlike the Chrysler Airflow, it would be a success.

The building of the new factory started 26 May 1938 in the new town of KdF-Stadt. Now called Wolfsburg, purpose-built for the factory workers, only produced a handful of cars by the time war started in 1939. None were actually delivered to holders of the completed saving stamp books, though one Type 1 Cabriolet was presented to Hitler on 20 April 1938 (his 49th birthday).

War meant production changed to military vehicles, the Type 81 Kübelwagen ("Bucket car") utility vehicle (VW's most common wartime model), and the amphibious Schwimmwagen which were used to equip the German forces.

Volkswagen factory with its own power plant

Volkswagen factory with its own power plant

[edit] 1945: British Army, Major Ivan Hirst, unclear future

The company owes its post-war existence largely to one man, British Army officer Major Ivan Hirst, REME. In April 1945, KdF-Stadt, and its heavily bombed factory were captured by the Americans, and subsequently handed over to the British, within whose occupation zone the town and factory fell. The factory was placed under the control of Oldham-born Hirst. At first, the plan was to use it for military vehicle maintenance. Since it had been used for military production, and had been in Hirst's words a "political animal" rather than a commercial enterprise, the equipment was in time intended to be salvaged as war reparations. Hirst painted one of the factory's cars green and demonstrated it to British Army headquarters. Short of light transport, in September 1945 the British Army was persuaded to place a vital order for 20,000. The first few hundred cars went to personnel from the occupying forces, and to the German Post Office.

Some UK Service personnel were allowed to take their VW Beetles' back to the UK when they were demobilized, and one of the very first Beetles brought back in that way (UK registration index JLT 420) is still owned by Peter Colborne-Baber, the son of the original proprietor of the UK's first official Volkswagen Importer, Colborne Carages of Ripley, Surrey.

By 1946 the factory was producing 1,000 cars a month, a remarkable feat considering it was still in disrepair. Due to roof and window damage, rain stopped production and steel to make the cars had to be bartered for new vehicles.

The car, and its town changed their Second World War-era names to "Volkswagen", and "Wolfsburg" respectively, and production was increasing. It was still unclear what was to become of the factory. It was offered to representatives from the British, American and French motor industries. Famously, all rejected it. After an inspection of the plant, Sir William Rootes, head of the British Rootes Group, told Hirst the project would fail within two years, and that the car "is quite unattractive to the average motorcar buyer, is too ugly and too noisy ... If you think you're going to build cars in this place, you're a bloody fool, young man". In a bizarre twist of fate, Volkswagen would manufacture a locally built version of Rootes' Hillman Avenger in Argentina in the 1980s, long after Rootes went bust at the hands of Chrysler in 1978—the Beetle outliving the Avenger by over 30 years.

Ford representatives were equally critical: the car was "not worth a damn". Henry Ford II, the son of Edsel Ford, did reportedly look at the possibility of taking over the VW factory, but dismissed the idea as soon as he looked up Wolfsburg on the map and found it to be too close for comfort to the East German border.

In France, Citroën started the 2CV on a similar marketing concept. Meanwhile, in Italy, the Fiat 500 "Topolino" was developed.

[edit] Survival in Allied occupied Germany

In Occupied Germany, the Allies followed the Morgenthau Plan, to remove all German war potential, by complete or partial pastoralisation. As part of this, in the Industrial plans for Germany, the rules for which industry Germany was to be allowed to retain were set out. German car production was set at a maximum of 10% of the 1936 car production numbers.[2]

The Volkswagen factory at Wolfsburg came under UK control in 1945, it was to be dismantled and shipped to Britain. Thankfully for Volkswagen, no British car manufacturer was interested in the factory; "the vehicle does not meet the fundamental technical requirement of a motor-car ... it is quite unattractive to the average buyer ... To build the car commercially would be a completely uneconomic enterprise".[3] The factory survived by producing cars for the British Army instead. Allied dismantling policy changed in late 1946 to mid 1947, although heavy industry continued to be dismantled until 1951. In March 1947 Herbert Hoover helped change policy by stating: "There is the illusion that the New Germany left after the annexations can be reduced to a 'pastoral state'. It cannot be done unless we exterminate or move 25,000,000 people out of it".[4] Thanks to the protection of British Army Major Ivan Hirst, Volkswagen survived the perilous times, and came to be part of the German economic miracle.

[edit] 1948–1974: icon for German regeneration

1949 Volkswagen Sedan

1949 Volkswagen Sedan
1958 Volkswagen Pickup

1958 Volkswagen Pickup
An original 1300 Deluxe, circa 1966.

An original 1300 Deluxe, circa 1966.
Rear, restored 1967 VW Beetle in Sri Lanka.

Rear, restored 1967 VW Beetle in Sri Lanka.
Volkswagen Beetle found in Torreon, Coahuila, Mexico

Volkswagen Beetle found in Torreon, Coahuila, Mexico

From 1948, Volkswagen became a very important element, symbolically and economically, of West German regeneration. Heinrich Nordhoff (1899–1968), a former senior manager at Opel who had overseen civilian and military vehicle production in the 1930s and 1940s, was recruited to run the factory in 1948. In 1949 Major Hirst left association with the company, as it was now re-formed as a trust, controlled by the West German government, and the government of the State of Lower Saxony. Apart from the introduction of the Volkswagen Type 2 commercial vehicle (van, pickup and camper), and the VW Karmann Ghia sports car, Nordhoff pursued the one-model policy until shortly before his death in 1968.

Volkswagens were first exhibited and sold in the United States in 1949, but only sold two units in America that first year. On its entry to the U.S. market, the VW was briefly sold as a "Victory Wagon". Volkswagen of America was formed in April 1955 to standardize sales and service in the United States. Production of the Type 1 Volkswagen Beetle increased dramatically over the years, the total reaching one million in 1955.

Sales soared — due in part to the famous advertising campaigns by New York advertising agency Doyle, Dane Bernbach. Led by art director Helmut Krone, and copywriters Julian Koenig and Bob Levinson, Volkswagen ads became as popular as the car, using crisp layouts and witty copy to lure the younger, sophisticated consumers with whom the car became associated. Despite the fact it was almost universally known as the Beetle (or the Bug), it was never officially labeled as such by the manufacturer, instead referred to as the Type 1. The first reference to the name Beetle occurred in U.S. advertising in 1968, but not until 1998 and the Golf-based New Beetle would the name be adopted by Volkswagen.

During the 1960s and early 1970s, although the car was becoming outdated, American exports, innovative advertising, and a growing reputation for reliability, helped production figures to surpass the levels of the previous record holder, the Ford Model T. By 1973, total production was over 16 million.

An original and unmodified 1963 VW Notchback.

An original and unmodified 1963 VW Notchback.

VW expanded its product line in 1961 with the introduction of several Type 3 models, which were essentially body style variations (Fastback, Notchback, Squareback) based on Type 1 mechanical underpinnings, and again in 1969 with the larger Type 4 (also known as the 411 and 412) models. These differed substantially from previous vehicles, with the notable introduction of monocoque/unibody construction, the option of a fully automatic transmission, electronic fuel injection, and a sturdier powerplant. Volkswagen added a "Super Beetle" (the Type 113) to its lineup in 1971. The Type 113 differed from the standard Beetle in its use of a MacPherson strut front suspension instead of the usual torsion bars. Also the nose of the car was stretched 2 inches (51 mm) to allow the spare tyre to lie flat, and the combination of these two features significantly increased the usable front luggage space. Despite the Super Beetle's (marketed outside North America as the VW 1302, later 1303) popularity with Volkswagen customers, purists preferred the standard Beetle with its less pronounced nose and its original torsion bar suspension. In 1973, Volkswagen introduced the military-themed Type 181, or "Trekker" in Europe and the UK, "Thing" in America, recalling the wartime Type 81. The military version was produced for the NATO-era German Army during the Cold War years of 1970 to 1979. The US Thing version only sold for two years, 1973 and 1974, due at least in part to Ralph Nader's automobile safety campaigns.

In 1964, Volkswagen succeeded in purchasing Auto Union, and in 1969, NSU Motorenwerke AG (NSU). The former company owned the historic Audi brand, which had disappeared after WW2. VW ultimately merged Auto Union and NSU to create the modern day Audi company, and would go on to develop it as its luxury vehicle marque. However, the purchase of Auto Union and NSU proved to be a pivotal point in Volkswagen's history, as both companies yielded the technological expertise that proved necessary for VW to survive when demand for its air-cooled models went into terminal decline as the 1970s dawned.

[edit] 1974: from Beetle to Golf/Rabbit

Volkswagen was in serious trouble by 1971.[citation needed] The Type 3 and Type 4 models had sold in much smaller numbers than the Beetle and the NSU-based K70 also failed to woo buyers. Beetle sales had started to decline rapidly in European and North American markets. The company knew that Beetle production had to end one day, but the conundrum of replacing it had been a never-ending nightmare. VW's ownership of Audi / Auto Union proved to be the key to the problem - with its expertise in front-wheel drive, and water-cooled engines which Volkswagen so desperately needed to produce a credible Beetle successor. Audi influences paved the way for this new generation of Volkswagens, known as the Polo, Golf and Passat.

The Volkswagen Polo was in fact simply a re-badging of the short-lived Audi 50, which had been hastily developed from a sedan design, the Audi 60. However, VW produced it shortly after the introduction of the Polo as the Volkswagen Derby. In the rear of the car can plainly be seen that panels are added to the Polo structure to make a "three-box" design of saloon (sedan), or saloon with a boot or trunk.

A 1975 American advertisement for the Volkswagen Golf, sold as the Rabbit in the U.S. and Canada.

A 1975 American advertisement for the Volkswagen Golf, sold as the Rabbit in the U.S. and Canada.

The Volkswagen Passat (Dasher in the U.S.), introduced in 1973, was again simply a fastback (available as either a hatchback or with separate boot) version of the Audi 80, using identical body and mechanical parts, and the Audi 80 was later produced on the same line in Wolfsburg as the Passat. Estate/wagon versions were offered for overseas markets, however, for two years, if British and South African customers wanted an estate/wagon version, they had to go considerably up-market and buy the Audi 80 GL estate.

However, the pivotal model which would turn Volkswagen's fortunes emerged as the Volkswagen Golf in 1974 (marketed in the United States and Canada as the Rabbit until 1985 and as the Golf until 2006, when the Rabbit name was re-introduced). This was a car unlike its predecessor in most significant ways, both mechanically as well as visually (its angular styling was designed by the Italian Giorgetto Giugiaro). Its design followed trends for small family cars set by the 1959 Mini and 1972 Renault 5 —the Golf had a transversely mounted, water-cooled engine in the front, driving the front wheels, and had a hatchback, a format that has dominated the market segment ever since. Beetle production at Wolfsburg ended upon the Golf's introduction, but continued in smaller numbers at other German factories (Hanover and Emden) until 1978, but mainstream production shifted to Brazil and Mexico.

[edit] Volkswagen from 1974 to 1990


Volkswagen Polo, 1990

Volkswagen Polo, 1990

While Volkswagen's range of cars soon became similar to that of other large European automakers, the Golf has been the mainstay of the Volkswagen lineup since its introduction, and the mechanical basis for several other cars of the company. There have been five generations of the Volkswagen Golf, the first of which was produced from the summer of 1974 until the end of 1983 (sold as the Rabbit in the United States and Canada and as the Caribe in Latin America). Its chassis also spawned the Volkswagen Scirocco sport coupe, Volkswagen Jetta saloon/sedan, Volkswagen Golf Cabriolet convertible, and Volkswagen Caddy pickup. North American production of the Rabbit commenced at a factory in New Stanton, Pennsylvania in 1978. The production numbers of the first-generation Golf has continued to grow annually in South Africa, with only slight modifications to the interior, engine and chassis. It would be produced in the United States as the Rabbit until the spring of 1984. The second-generation Golf hatchback/Jetta sedan ran from late 1983 to late 1991, and a North American version produced in Pennsylvania went on sale at the start of the 1985 model year.

In the 1980s, Volkswagen's sales in the United States and Canada fell dramatically, despite the success of models like the Golf elsewhere. The problems had stemmed from the Rabbit, which had developed a reputation for bad electrical systems and oil burning.[citation needed] The Japanese and the Americans were able to compete with similar products at lower prices. Sales in the United States were 293,595 in 1980, but by 1984 they were down to 177,709.[5] The introduction of the second-generation Golf, GTI and Jetta models helped Volkswagen briefly in North America. Motor Trend named the GTI its Car of the Year for 1985, and Volkswagen rose in the J.D. Power buyer satisfaction ratings to eighth place in 1985, up from 22nd a year earlier.[6] VW's American sales broke 200,000 in 1985 and 1986 before resuming the downward trend from earlier in the decade. Chairman Carl Hahn decided to expand the company elsewhere, and the New Stanton, Pennsylvania factory closed on 14 July 1988.[7] Meanwhile, Hahn expanded the company by purchasing a greater share of the Spanish car maker SEAT, which VW bought outright in 1990; the Czech car maker Škoda Auto was acquired the following year.

Volkswagen had entered the supermini market in 1976 with the Volkswagen Polo, a stylish and spacious three-door hatchback designed by Bertone. It was a strong seller in West Germany and most of the rest of Western Europe, being one of the first foreign small cars to prove popular in Britain. The second generation model, launched in 1981 and sold as a hatchback and "coupe" (with the hatchback resembling a small estate car and the coupe being similar to a conventional hatchback), was an even greater success for Volkswagen. It was facelifted in 1990 and was still selling well after 13 years, when it was replaced by the third generation Polo in 1994.

[edit] Volkswagen from 1991 to 2000

The 2000 Volkswagen Golf GL, in North American form

The 2000 Volkswagen Golf GL, in North American form

In 1991, Volkswagen launched the third-generation Golf, which was European Car of the Year for 1992 (the previous two generations were nominated but lost to the Citroën CX in 1975 and the Fiat Uno in 1984). The Golf Mk3 and Jetta arrived in North America just before the start of 1994 model year, first appearing in southern California in the late spring of 1993. The sedan version of the Golf was badged Vento in Europe (but remained Jetta in the USA, where its popularity eventually outstripped the Golf).

The late 1990s saw a gradual change in perception of the company's products - with Audi having elevated itself into same league as BMW and Mercedes-Benz, Volkswagen moved upmarket to fill the void left by Audi; with SEAT and Škoda now occupying what was once VW's core market. The first tangible evidence of this was the fifth-generation Passat in 1996 with its high-quality interior trim and standards of build quality which were demonstrably a cut above the run-of-the-mill Ford Mondeo, Opel/Vauxhall/Holden/Chevrolet Vectra and Peugeot 406.

This move upmarket was continued with the Golf Mk4, introduced at the end of 1997 (and in North America in 1999), its chassis spawned a host of other cars within the Volkswagen group — the Volkswagen Bora (the sedan, still called Jetta in the USA), New Beetle, SEAT Toledo, SEAT León, Audi A3, Audi TT and Škoda Octavia. However, it was beaten into third place for the 1998 European Car of the Year award by the winning Alfa Romeo 156 and runner-up Audi A6.

The other main models have been the Polo, a smaller car than the Golf, and the larger Passat for the segment above the Golf. The Scirocco and the later Corrado were both Golf-based coupés.

By the early 1990s, Volkswagen's annual sales in the United States were below 100,000, and many car buyers found the company's products to be lacking in value. Some automotive journalists believed that Volkswagen would have to quit the North American market altogether. VW eventually realized that the Beetle was the heart and soul of the brand in North America, and the firm quickly set about creating a new Beetle for American and Canadian showrooms.

In 1994, Volkswagen unveiled the J Mays-designed Concept One, a "retro"-themed car with a resemblance to the original Beetle but based on the Polo platform. Its genesis was secret and in opposition to VW management, who felt it was too backward-looking. Management could not deny the positive public response to the concept car and gave the green-light to its development as the New Beetle. The production car would be based on the Golf rather than the Polo, because the Polo frame was too small for the car to pass crash test standards in the U.S. It has been quite popular in the North America and is now gaining in the EU.

Volkswagen's fortunes in North America improved once the third-generation Golf and Jetta models became available there. Sharp advertising and savvy promotional stunts, like including Trek bicycles, and accompanying bike racks with a limited edition of the 1996 Jetta sedan, were credited for the firm's recovery in the U.S. and Canada, but the introductions of the New Beetle and the fifth-generation Passat were a major boost to the brand.

In the UK, Volkswagen's market share grew throughout the 1990s. In 1990, the Golf was Britain's 12th most popular car with nearly 50,000 units sold. The Mk3 Polo achieved similar success in the mid 1990s, but in 1999 the Mk4 Golf was Volkswagen's first-ever entrant in Britain's top 10 list of most popular new cars. Its success continued into the 2000s, while the Polo and Passat were never far outside the top 10. Bad news for Volkswagen during this era was a dip in customer satisfaction. A brand which had built its reputation on reliability was now being overtaken by marques whose reputations had been damaged by quality problems. This bad press took several years to eradicate.

[edit] Volkswagen in the 21st century

2006 Volkswagen Phaeton

2006 Volkswagen Phaeton

Volkswagen began introducing an array of new models after Bernd Pischetsrieder became Volkswagen Group CEO (responsible for all Group brands) in 2002. The fifth generation VW Golf was launched in 2004, came runner-up to the Fiat Panda in the 2004 European Car of the Year, and has spawned several cousins: SEAT Toledo, Škoda Octavia and Audi A3 hatchback ranges, as well as a new mini-MPV, the SEAT Altea. The GTI, a "hot hatchback" performance version of the Golf, boasts a 2.0 L Turbocharged FSI direct injection engine. VW began marketing the Golf under the Rabbit name once again in the U.S. and Canada in June 2006. (The GTI had arrived to North America four months earlier). The fifth-generation Jetta, and the performance version, the GLI, are also available in the United States and Canada. The sixth-generation Passat and the fifth-generation Jetta both debuted in 2005, and VW has announced plans to expand its lineup further by bringing back the Scirocco by 2008. Other models in Wolfgang Bernhard's (Volkswagen brand CEO) "product offensive" include the Tiguan mid-sized SUV in 2008 and a Passat Coupé. In November 2006 Bernd Pischetsrieder announced his resignation as Volkswagen Group CEO, and was replaced by Audi worldwide CEO Martin Winterkorn at the beginning of 2007. Winterkorn is credited with making Audi a challenger to the dominance of BMW and Mercedes, and his design-led strategy has led to Audi being considered one of the most important brands in the world. It remains to be seen how Winterkorn's focus on design shapes the Volkswagen brand's future. Nevertheless, Volkswagen continues to have complicated relations with both unions and shareholders. The German state of Lower Saxony owns significant stock in VW, as does sportscar manufacturer Porsche. Recently Porsche has announced to buy the majority of Volkswagen's stock, thus becoming the new owner of Volkswagen.

The fifth-generation Passat, from 2001.5 to 2005 features a facelift from the 98-01 model

The fifth-generation Passat, from 2001.5 to 2005 features a facelift from the 98-01 model

In North America, VW faced many challenges. After rising significantly between 1998 and 2001, VW's North American sales began to fall sharply leading to a 2005 loss of roughly $1 billion (U.S.) for its operations in the U.S. and Canada. Profitablility has not been strong, and the lack of reliability of the company's cars appears to bear some of the responsibility for this situation. By 2005, its models sat near the bottom of Consumer Reports reliability ratings, and J.D. Power and Associates ranked VW 35th out of 37 bands in its initial quality survey. Attempts to enter a new market segment also compromised Volkswagen's standing in North America. In 2002, Volkswagen announced the debut of its Phaeton luxury car, which was critically acclaimed but not well received in the marketplace. VW announced its discontinuance in the U.S. market for the 2007 model year due to the disappointing sales.

The 2006 Jetta

The 2006 Jetta

Volkswagen in 2005, despite challenges, still maintained North American sales of 224,195 -- a dramatic increase from the low in 1993 when US sales totaled only 49,533 vehicles. Momentum continued for fiscal 2006, as VW's North American sales for the year were 235,140 vehicles, a 4.9 percent increase over 2005, despite a slump in domestic North American manufacturer's sales. VW plans to close out the decade with the release on several new vehicles worldwide and a barrage of advertising. In conjunction with the introduction of new models, production location of Volkswagen vehicles also underwent great change. The 2007 Eos, a hardtop convertible, is produced in a new facility in Portugal. All Golf/Rabbit and GTIs as of 2006 are manufactured in Wolfsburg, Germany, rather than VW's Mexican factory in Puebla, where Golfs and GTIs for the North American market were produced from 1989 to 1998, and the Brazilian factory in Curitiba, where Golfs and GTIs were produced from 1999 to 2006. (The Jetta has principally been made in Mexico since 1989). VW is also in the process of reconfiguring an automotive assembly plant in Belgium. The new models and investments in manufacturing improvements were noticed immediately by automotive

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Steamer New York in c. 1908

Steamer New York in c. 1908

Naval architecture is an engineering discipline dealing with the design, construction and repair of marine vehicles.

Due to the complexity associated with operating in a marine environment naval architecture is by necessity a co-operative effort between groups of technically skilled individuals that are specialists in particular fields, often co-ordinated by a lead naval architect. This inherent complexity also means that the analytical tools available are much less evolved than those for designing aircraft, cars and even space craft. This is due primarily to the paucity of data on the environment the marine vehicle is required to work in and the complexity of the interaction of waves and wind on a marine structure.

The areas of expertise filled by naval architects are typically:

  • Hydrostatics (ex: trim & stability)
  • Hydrodynamics (ex: resistance and powering, seakeeping, manoeuvring)
  • Arrangements (ex: concept design, volume & access)
  • Structures (ex: global strength, seaway responses)

[edit] The craft of naval architecture

Venetian gondola

Venetian gondola

Traditionally, naval architecture has been more craft than science. The suitability of a vessel's shape was judged by looking at a half-model of a vessel or a prototype. Ungainly shapes or abrupt transitions were frowned on as being flawed. This included, rigging, deck arrangements, and even fixtures. Subjective descriptors such as ungainly, full, and fine were used as a substitute for the more precise terms used today. A vessel was, and still is described as having a ‘fair’ shape. The term ‘fair’ is meant to denote not only a smooth transition from fore to aft but also a shape that was ‘right.’ Determining what ‘right’ is in a particular situation in the absence of definitive supporting analysis encompasses the art of naval architecture to this day.

[edit] The science of naval architecture

Hull Form

Hull Form

Modern low-cost digital computers and dedicated software, combined with extensive research to correlate full-scale, towing tank and analytical data, have enabled naval architects to more accurately predict the performance of a marine vehicle. These tools are used for static stability (intact and damaged), dynamic stability, resistance, powering, hull development, structural analysis, etc. Curiously, analytical tools (such as Computational Fluid Dynamics) still have difficulty in predicting with absolute certainty the response of a floating body in a random sea. The challenge is being addressed by universities, towing tanks, and other marine research entities throughout the world. Data is regularly shared in international conferences sponsored by RINA, Society of Naval Architects and Marine Engineers (SNAME) and others.

[edit] The Naval Architect

A naval architect is a professional engineer who is responsible for the design, construction, and/or repair of ships, boats, other marine vessels, and offshore structures, both commercial and military, including:

Some of these vessels are amongst the largest and most complex and highly valued movable structures produced by mankind. They are the most efficient method of transporting the world's raw materials and products known to man. Without them our society could not exist as it currently does.

Modern engineering on this scale is essentially a team activity conducted by specialists in their respective fields and disciplines. However, it is the naval architects who often integrate their activities and take ultimate responsibility for the overall project. This demanding leadership role requires managerial qualities and the ability to bring together the often-conflicting demands of the various design constraints to produce a product, which is "fit for the purpose."

In addition to this leadership role, a naval architect also has a specialist function in ensuring that a safe, economic, and seaworthy design is produced.

To undertake all these tasks, a naval architect must have an understanding of many branches of engineering and must be in the forefront of high technology areas such as vessel arrangements, hydrodynamics, stability, and structures. He or she must be able to effectively utilize the services provided by scientists, lawyers, accountants, and business people of many kinds.

Naval architects typically work for shipyards, ship owners, design firms and consultancies, equipment manufacturers, regulatory bodies, navies, and governments.

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铣刀是多刃刀具,每一个齿相当于一把简单的刀具。如图 所示。


1-待加工表面 2-切屑 3-基面 4-前刀面 5-后刀面 6-已加工表面 7-切削平面 8-加工表面
图 圆柱铣刀及其组成部分
1. 铣刀各部分名称如图所示
(1) 待加工表面 工件上即将被切去的表面。
(2) 已加工表面 工件上已经加工好的表面。
(3) 基面 平面3是一个假象平面,称基面。它是通过刀刃上任意一点并于该点的切削速度方向垂直的表面。
(4) 切削平面 平面7也是一个假想平面,称切削平面。它是通过刀刃并于基面垂直的平面。
(5) 前刀面 切削时,切削流出的哪个面4叫前刀面。
(6) 后刀面 与加工表面8相对的那个面5叫后刀面。
2. 圆柱铣刀的主要几何角度及作用如图所示
(1)前角γ 前刀面与基面之间的夹角。其主要作用是使刀刃锋利。切削时金属变形减小,切销容易排出,从而使切削时省力。
(2)后角a 后刀面与切削平面之间的夹角。其主要作用是减少后刀面与切削平面之间的摩擦,减小工件的表面粗糙度。
(3)螺旋角β 螺旋齿刀刃上的切线与铣刀轴线之间的夹角。其主要作用是使刀齿逐渐的切入和切离工件,提高切削平稳性。同时对圆柱铣刀,还有使切削从端面顺利流出的作用。
3. 端铣刀的主要几何角度及作用
端铣刀的刀齿除了主切削刃外,在端面上还有副切削刃。因此,端铣刀的主要几何角度除了前脚、后角以外,还有主偏角、副偏角和刃倾角。如图 示。


图 端铣刀的构成
(1)主偏角kr 主切削刃与以加工表面之间的夹角。其变化影响主切削刃参加切削的长度,并能改变切屑的宽度和厚度。
(2) 副偏角krˊ 副切削刃与已加工表面之间的夹角。其主要作用是减少副切削刃与已加工表面的摩擦,并影响副切削刃对已加工表面的摩擦,并影响副切削刃对已加工表面的修光作用。
(3) 刃倾角λs 主切削刃与基面之间的夹角。主要起到斜刃切割的作用。

歡迎來到Bewise Inc.的世界,首先恭喜您來到這接受新的資訊讓產業更有競爭力,我們是提供專業刀具製造商,應對客戶高品質的刀具需求,我們可以協助客戶滿足您對產業的不同要求,我們有能力達到非常卓越的客戶需求品質,這是現有相關技術無法比擬的,我們成功的滿足了各行各業的要求,包括:精密HSS DIN切削刀具協助客戶設計刀具流程DIN or JIS 鎢鋼切削刀具設計NAS986 NAS965 NAS897 NAS937orNAS907 航太切削刀具,NAS航太刀具設計超高硬度的切削刀具BW捨棄式鑽石V卡刀BW捨棄式金屬圓鋸片木工捨棄式金屬圓鋸片PCD木工圓鋸片醫療配件刀具設計汽車業刀具設計電子產業鑽石刀具全鎢鋼V卡刀-電路版專用全鎢鋼鋸片焊刃式側銑刀焊刃式千鳥側銑刀焊刃式T型銑刀焊刃式千鳥T型銑刀焊刃式螺旋機械鉸刀全鎢鋼斜邊刀電路版專用鎢鋼焊刃式高速鉸刀超微粒鎢鋼機械鉸刀超微粒鎢鋼定點鑽焊刃式帶柄角度銑刀焊刃式螺旋立銑刀焊刃式帶柄倒角銑刀焊刃式角度銑刀焊刃式筒型平面銑刀木工產業鑽石刀具等等。我們的產品涵蓋了從民生刀具到工業級的刀具設計;從微細刀具到大型刀具;從小型生產到大型量產;全自動整合;我們的技術可提供您連續生產的效能,我們整體的服務及卓越的技術,恭迎您親自體驗!!

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摘要:指出了對高速鋼採用-196℃液氮深冷處理可使組織發生明顯變化,有效促使殘留奧氏體向馬氏體轉變及超細碳化物的析出,使模具獲得較佳的綜合力學性能,深冷處理後高速鋼模具的使用壽命較常規熱處理提高三倍以上,具有十分重要的使用價值。

關鍵詞 高速鋼
模具 殘留奧氏體 超細碳化物 使用壽命

1 引言

高速鋼自1990年問世以來,一直是以製造金屬切削
刀具而 著稱,隨著科學技術的飛躍發展,高速鋼的應用範圍不斷擴大。從60年代開始,日本以汽車、自行車工業為中心,試用高速鋼做模具取得成功,現在生產的高速鋼 約有15%用於製造模具。高速鋼主要是用來製造冷擠壓模具及冷墩壓模具,特別是Mo系高速鋼比W系高速鋼韌性更加優越。高速鋼用於模具的主要工藝難點在於 熱處理技術的掌握。目前我國使用最廣泛的高速鋼是鎢系W18Cr4V(簡稱18-4-1)鋼和鎢鉬系W6Mo5Cr4V2(簡稱6-5-4-2)鋼 [1]。這兩種鋼的傳統淬火回火工藝特點是:高溫淬火後需在一次硬化範圍內回火三次,以獲得高硬度和熱硬性,工藝規範如表1所示。主要缺點是在某些場所硬 度不足。為了改善模具強韌性,近年來高速鋼的傳統淬火回火工藝也發生了變革。

表1 高速鋼常用熱處理規格

鋼號 淬火加熱溫度範圍[切削髮
刀具] [冷作模具](℃) 回火規範
W18Cr4V 1240-1310 1240-1250 560℃×1h×3次
W6Mo5Cr4V2 1200-1250 1180-1200 560℃×1h×3次

2 深冷處理法原理及工藝過程

高 速鋼的冷處理是在三十年代後期提出的,按傳統概念,冷處理的目的是將淬火鋼件冷卻到零下(一般為-60℃---70℃),使鋼內的殘餘奧氏體轉變為馬氏 體。過去工業上採用高速鋼冷處理主要應用於縮短熱處理生產週期,即用淬火+冷處理+一次回火來代替處理方法[2],即在-100℃- -196℃(液氮)處理淬火零件,其後在400℃回火一次,不必需原來2-3次的重複回火。經深冷處理後零件的硬度和耐磨性進一步改善,耐磨性可提高 40%,既縮短回火時間,節省了能量,又明顯提高了模具使用壽命。20世紀70年代以來,國內外對深冷處理的研究工作卓有成效,前蘇聯、美國、日本等國均 已成功利用深冷處理提高工模具的使用壽命、工件的耐磨性及尺寸穩定性。

(1)深冷處理後的組織轉變。

經深冷處理的淬火高速鋼不但引起了奧氏體轉變,同時也引起了馬氏體轉變。過去幾十年來強調的是殘餘奧氏體轉變,馬氏體分解這一新發現可以看作近年來高速鋼深冷處理研究的新進展。

高 速鋼種的馬氏體最終轉變點Mf非常低,例如W18Cr4V鋼的Mf點約-100℃,因此淬火冷卻到室溫會殘留大量的奧氏體,一般認為鋼中殘留較多的奧氏體 是有害的,會降低鋼的硬度、耐磨性及使用壽命,還使許多物理性能特別是熱性能和磁性下降。試驗證明:採用深冷處理可使鋼中殘留奧氏體降至最低極限,由表2 可以看出W18Cr4V高速鋼經淬火、回火後,深冷處理可以使回火後的殘留奧氏體量降低24%。

表2 不同處理工藝對W18Cr4V鋼殘留奧氏體的影響(體積百分數%)

熱處理工藝 殘留奧氏體AR
1280℃淬火+500℃×1h×3次回火 10
-196℃深冷處理 7.6

前 蘇聯列寧格勒工業大學研究了-196℃液氮中15min的深冷處理對高速鋼轉變的影響,試驗結果表明,-70℃---75℃到-130℃-- -140℃範圍內進行深冷處理時發生馬氏體轉變,當冷卻到-196℃時轉變停滯。在-90℃---120℃溫度範圍內,出現試樣容積的見效,這證明馬氏體 已部分分解並在位錯面上析出了碳原子和形成了超顯微碳化物。可見,社冷處理使高速鋼析出碳化物的顆粒明顯增多,且瀰散均勻,W18Cr4V鋼經深冷處理後 碳化物顆粒約增加8%,W6Mo5Cr4V2鋼析出的碳化物顆粒約增加76%,基體組織亦明顯細化。

(2)深冷處理對高速鋼性能的影響。

深 冷處理過程中,大量的殘留奧氏體轉變為馬氏體,特別是過飽和的亞穩定馬氏體在從-196℃至室溫過程中會降低過飽和度,析出瀰散、尺寸僅為20-60A並 與基體保持共格關係的超微細碳化物,可以使馬氏體晶格畸變減小,微觀應力降低,而細小瀰散的碳化物在材料塑性變形時可以阻礙位錯運動,從而強化基體組織。 同時由於超微細碳化物顆析出,均勻分佈在馬氏體基體上,減弱了晶界催化作用,而基體組織的細化既減弱了雜質元素在晶界的偏聚程度,又發揮了晶界強化作用, 從而改善了高速鋼的性能,使硬度、衝擊韌性和耐磨性都顯著提高[3]。模具硬度高,其耐磨性也就好,如硬度由60HRC提高至62-63HRC,模具耐磨 性增加30%-40%。

可看出深冷處理後模具的相對耐磨性提高40%,延長深冷處理時間後,在硬度沒有太大變化的情況下,相對耐磨性ξ有所增大[4]。

(3)高速鋼模具深冷處理工藝過程

為防止高速鋼模具(特別是形狀複雜的模具)在深冷處理中發生斷裂和變脆,建議淬火後的高速鋼模具在560℃回火1h再進行液氮深冷處理,然後在400℃進行最終回火30-60min,這種熱處理工藝不但可以防止模具斷裂和脆化,而且可以提高模具壽命1.5-2倍。

高速鋼模具深冷處理工藝過程為」,模具除油垢→放入保溫罐中→少量多次注入液氮→保溫4h→取出模具→400℃回火45min。

3 高速鋼模具深冷處理應用實例

(1)凸模:汽車廠的高速鋼凸模,未經深冷處理時只能使用10萬次,而採用液氮經-196℃×4h深冷處理後再400回火,使用壽命提高到130萬次。
(2)沖壓凹模:生產使用結果表明,深冷處理後產量提高二倍多。
(3)硅鋼片冷沖模:為降低模具深冷處理後的脆性和內應力,將深冷處理與中溫回火相配合,可改善模具抗破壞性及其它綜合性能,模具的刃磨壽命提高3倍以上,穩定在5-7萬沖次。

4 結束語

(1)高速鋼深冷處理過程中,由於殘留奧氏體向馬氏體以及超細碳化物的析出,硬度、耐磨性、衝擊韌性、紅硬性得到提高。
(2)作為一種新工藝深冷處理應用在高速模具鋼的熱處理中,可顯著提高模具的使用壽命,具有很大的實用價值。

參考文獻
1 陳景榕.高速鋼冷作模具[J].機械工業材料,1994,(8)
2 中山久彥.用液氮進行的液體超冷處溫[J].國外金屬熱處理,1987,(1)
3 叢吉遠等.高速鋼深冷處理的組織轉變及耐磨性[J].熱加工工藝,1998,(3)
4 陳長風等.深冷處理對T12鋼磨料磨損性能的影響[J].金屬熱處理,2000,(10)
作者:空軍航空維修技術學院機電工程系(湖南長沙 410124) 劉勁松

歡迎來到Bewise Inc.的世界,首先恭喜您來到這接受新的資訊讓產業更有競爭力,我們是提供專業刀具製造商,應對客戶高品質的刀具需求,我們可以協助客戶滿足您對產業的不同要求,我們有能力達到非常卓越的客戶需求品質,這是現有相關技術無法比擬的,我們成功的滿足了各行各業的要求,包括:精密HSS DIN切削刀具協助客戶設計刀具流程DIN or JIS 鎢鋼切削刀具設計NAS986 NAS965 NAS897 NAS937orNAS907 航太切削刀具,NAS航太刀具設計超高硬度的切削刀具BW捨棄式鑽石V卡刀BW捨棄式金屬圓鋸片木工捨棄式金屬圓鋸片PCD木工圓鋸片醫療配件刀具設計汽車業刀具設計電子產業鑽石刀具全鎢鋼V卡刀-電路版專用全鎢鋼鋸片焊刃式側銑刀焊刃式千鳥側銑刀焊刃式T型銑刀焊刃式千鳥T型銑刀焊刃式螺旋機械鉸刀全鎢鋼斜邊刀電路版專用鎢鋼焊刃式高速鉸刀超微粒鎢鋼機械鉸刀超微粒鎢鋼定點鑽焊刃式帶柄角度銑刀焊刃式螺旋立銑刀焊刃式帶柄倒角銑刀焊刃式角度銑刀焊刃式筒型平面銑刀木工產業鑽石刀具等等。我們的產品涵蓋了從民生刀具到工業級的刀具設計;從微細刀具到大型刀具;從小型生產到大型量產;全自動整合;我們的技術可提供您連續生產的效能,我們整體的服務及卓越的技術,恭迎您親自體驗!!

BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 http://www.tool-tool..com / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS DIN Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolNAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end milldisc milling cutter,Aerospace cutting toolhss drillФрезерыCarbide drillHigh speed steelMilling cutterCVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden FingerEdge modifying knifeSolid carbide saw blade-V typeV-type locking-special use for PC boardMetal Slitting SawaCarbide Side milling CuttersCarbide Side Milling Cutters With Staggered TeethCarbide T-Slot Milling CuttersCarbide T-Slot Milling Cutters With Staggered TeethCarbide Machine ReamersHigh speed reamer-standard typeHigh speed reamer-long type’’PCD V-CutterPCD Wood toolsPCD Cutting toolsPCD Circular Saw BladePVDD End Millsdiamond tool V-type locking-special use for PC board Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) ‘FreseElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterNAS toolDIN or JIS toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

Bewise Inc. www.tool-tool.com

ようこそBewise Inc.の世界へお越し下さいませ、先ず御目出度たいのは新たな

情報を受け取って頂き、もっと各産業に競争力プラス展開。

弊社は専門なエンドミルの製造メーカーで、客先に色んな分野のニーズ

豊富なパリエーションを満足させ、特にハイテク品質要求にサポート致します。

弊社は各領域に供給できる内容は:

(1)精密HSSエンドミルのR&D

(2)Carbide Cutting tools設計

(3)鎢鋼エンドミル設計

(4)航空エンドミル設計

(5)超高硬度エンドミル

(6)ダイヤモンドエンドミル

(7)医療用品エンドミル設計

(8)自動車部品&材料加工向けエンドミル設計

弊社の製品の供給調達機能は:

(1)生活産業~ハイテク工業までのエンドミル設計

(2)ミクロエンドミル~大型エンドミル供給

(3)小Lot生産~大量発注対応供給

(4)オートメーション整備調達

(5)スポット対応~流れ生産対応

弊社の全般供給

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