BW Professional Cutter Expert www.tool-tool.com

Bewise Inc. www.tool-tool.com Reference source from the internet.

作者：Craig Kovacic

Yearly maintenance procedures will be different for every injection molding location depending on mold cycle volume. Here are some general guidelines that any molder can use for your hot runners, heaters, leader and ejector pins and more to keep your tooling running efficiently and to prevent unwanted surprises.
1. Check vents for telltale rust or moisture – If you see rust or moisture around a hot runner vent hole, it indicates internal condensation or the possibility that a water line popped off. This moisture causes a short and can be fatal to heaters. When machines are not running 24/7 and are turned off overnight or on weekends, the chances of such condensation increases.
2. Take the time to remind operators not to ‘clear’ nozzle tips from gates – If an operator happens to notice a tiny piece of steel flush with the gate of the mold, it may turn out to be a point-gate needle assembly. ‘Clearing’ this perceived obstruction usually destroys the nozzle tip. To prevent nozzle destruction, verify the tip style of the hot runner system before taking action and assure all operators are well trained to identify the different tip styles they will come in contact with.
3. Lubricate the slide retainers – This is an activity that really should be done once a week if running a 24/7 operation. Year-end is a great opportunity to create a routine maintenance program for lubricating these parts.
4. Cross-check your heater ohm readings – Assuming you checked the ohm readings when your heater was new, this is the time to take a new reading and compare. If the readings are up or down by 10 percent, it is time to start thinking about replacing the heater to ensure it does not fail at a critical time during your production process. If the initial ohm reading was never taken, get a reading now and use that as a baseline for future checks on that heater.
5. Look for signs of wear between leader pins and bushings – Look for scores or scrapes. This damage is due to a lack of grease. If marks are just beginning, you can extend the life of the leader pins and bushings by keeping them well greased. If you find significant wear, it is time to install new parts. Otherwise, cavities and cores may not line-up properly, resulting in unequal wall thickness on your part.
6. Check for water flow – Hookup a hose to the out port and run water through the water line into a bucket. Unclear or colored water may be a sign of rust and poor water flow signifies blockage. Drill out the water lines if these problems are found (or clean with whatever method you typically use). Future problems due to rust and blockage can be prevented by improvements in the plant’s water treatment system.
7. Clean the ejector pins – Over the course of one year, ejector pins will become dirty with gas buildup and film. A good cleaning with mold cleaner every six to12 months is recommended. Once clean, put a light coating of grease on the pins to prevent galling or breakage.
8. Look for nicks in the radius area of your sprue bushings – Nicks are caused by leftover loose, hardened pieces of plastic left in the machine nozzle that cause damage due to clamping force from the injection carriage unit during injection forward. Problems may also occur from a misalignment issue. Look for both possibilities when nicks are found. Replace sprue bushings if damage is bad to prevent a flower pot leak (an old molders term: leakage of plastic between the bushing and the machine nozzle tip).
Following these tips will help you to recognize and prevent potential problems, keeping your molds running at optimal levels.

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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 tool、aerospace tool .HSS  DIN Cutting tool、Carbide end mills、Carbide cutting tool、NAS Cutting tool、NAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end mill、disc milling cutter,Aerospace cutting tool、hss drill’Фрезеры’Carbide drill、High speed steel、Compound Sharpener’Milling cutter、INDUCTORS FOR PCD’CVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) ’Core drill、Tapered end mills、CVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden Finger’PCD V-Cutter’PCD Wood tools’PCD Cutting tools’PCD Circular Saw Blade’PVDD End Mills’diamond tool. INDUCTORS FOR PCD . POWDER FORMING MACHINE ‘Single Crystal Diamond ‘Metric end mills、Miniature end mills、Специальные режущие инструменты ‘Пустотелое сверло ‘Pilot reamer、Fraises’Fresas con mango’ PCD (Polycrystalline diamond) ‘Frese’POWDER FORMING MACHINE’Electronics cutter、Step drill、Metal cutting saw、Double margin drill、Gun barrel、Angle milling cutter、Carbide burrs、Carbide tipped cutter、Chamfering tool、IC card engraving cutter、Side cutter、Staple Cutter’PCD diamond cutter specialized in grooving floors’V-Cut PCD Circular Diamond Tipped Saw Blade with Indexable Insert’ PCD Diamond Tool’ Saw Blade with Indexable Insert’NAS tool、DIN or JIS tool、Special tool、Metal slitting saws、Shell end mills、Side and face milling cutters、Side chip clearance saws、Long end mills’end mill grinder’drill grinder’sharpener、Stub roughing end mills、Dovetail milling cutters、Carbide slot drills、Carbide torus cutters、Angel carbide end mills、Carbide torus cutters、Carbide ball-nosed slot drills、Mould cutter、Tool manufacturer.

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BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web  www.tool-tool.com  for more info.