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目前日期文章:201303 (3)

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The cutter materials and their contrast

This list includes eight cutter materials and their contrast as below:

  1. Mono Diamond)
  2. CO PCD
  3. Si PCD
  4. PCBN
  5. Si3N4
  6. SiC
  7. WC
  8. Steel
The cutter materials and their contrast
material Mono Diamond CO PCD si PCD PCBN Si3N4 SiC WC Steel
properties
Density g/cm3 3.52 3.8~4.10 3.4 4~4.20 3.2 3 15 7.8
Knoop Hadrness kg/mm2 6000~9000 5000~8000 5000 2700~3200 1800 2200 1500 560
Toughuess Mpam-2 3.4 6.1~8.9 6.9 4.1~7.2 6.4 4 11 46
Compression Strength Mpa 2000 7700 4200 3800 6800 7000 5400 1850
Tensile strength Mpa 2600 1300 600 500 470 400 1100 1760
Thermal Expansion 10-6/°C 0.8~4.8 1.5~3.8 3.8 3.5~4.2 3.5 3.8 4.3~5.6 11.2~14.3
Thermal Conductivity w/mk 600~1200 560 120 150 30 40 80 50
Friction   0.05~0.10 0.1 0.1 0.1 0.2 0.2 0.2 0.8

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tool-How to choose the cutting tool for hardening material above HRC50?
There are higher requirements and more difficulties for many hardened molds. Hence general carbide cutters cannot reach such request of accuracy. Therefore, it should pay more attention to selection of cutting tools for hardened material.

Since hardening material which HRC is above 50, with higher hardness, the carbide cutter is difficult to meet the processing requirements, it will cause badly wear even break after CNC machining for about ten minutes. General carbide cutters cannot reach the request accuracy because the hardened mold is with higher requirement and difficulty.

Some points for choosing cutters for machining hardened materials as below:

  1. Select super micro grain carbide rod and design high rigid tool body to ensure toughness and rigidity of the tool.
  2. Select the blade the design of the large helix angle ranging from sub-and four-blade design so that the cutters may reach radial beating with heavy cutting within high-speed and high hardness cutting.
  3. Choose carbide cutter with new crystal coating. PVD coating almost cannot be used in high hardness cutting.. the crystal coating may solve it basically about the high temperature / acid resistance / wear / and longer tool life.
  4. Cooperate with the powerful tool companies to get their further technical supports and tool configuration, reducing the procurement chain and purchasing costs.

Good carbide cutters with high rigidity of the tool body and new type coating may get high efficiency, precision, and longer tool life. From pre-hardened steel to hardened steel, during high-speed, and high efficient processing; from rough to high precision machining, to achieve a long life; high precision; high quality processing makes it is easier to proceed high-speed and high rigid machining.

Article reference source : NewMaker

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Bewise Inc., being a professional manufacturer of various cutting tools, is endeavoring to make excellent products. We are very experienced in custom-made tools, and good at solving customers’ problems when they meet difficulties and troubles. Through everlasting research and practices, we understand thoroughly about different materials of cutters and cutting tools.

 

BW's popular products for tool series including circular saw, carbide cutting tool, saw blade, wood saw blade, special tool,side milling cutter, …etc; For machines we have spiral tube cooler, cutter grinder, and the latest design and advanced powder forming machine / pelletizer. Bewise is a superior manufacturer and supplier of cutter production and machinery industry.

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How to choose woodworking cutters?--part2

Selection of woodworking cutters

  1. identify the main technical parameters of the cutter
    Main parameters:outer diameter, machining thickness, and the center diameter.
    Other technical parameters: number of teeth, the direction of rotation, rotation speed, feed rate, clamping way, and cutter material.
  2. Choose the structure type of cutter
    According the request and characteristics of cutting object, and consideration from both the technical and economic aspects, select the whole cutters or welding cutters, assembly cutters, and combination cutter.
  3. The choice of the cutter rotation direction
    Cutter rotation direction is determined in accordance with the direction of rotation of the processing machinery spindle and the tool axis and the feed of the work piece relative position of the whole cutter, or assembling cutter, the inclination of the cutting blade relative to cutter radius determines the rotation of the cutter direction.
  4. Selection of cutting amount of end mills
    Cutting amount of end mills are including cutting speed, feed speed of work material, and depth of milling. Cutting speed depends on the rpm and the radius of the end mills .. feed rate depends on the requirements of cutting surface .. the surface roughness of work material largely depends on the feed rate per tooth during cutting process, too much feed will cause too rough surface of work piece; too small feed will cause burnt phenomenon on the surface, so the feed rate must be appropriate.
  5. Operation stability of end mills
    The stability of the cutter operation is to ensure that the basis of the machining accuracy and surface quality .. including two aspects: one is cutter excited vibration in machining due to external forces; the other is that cutter happens deformation by external forces.
  6. Safety of milling process
    The safety of the milling cutter includes the limitation of rotation speed, the limitation of chip thickness, height restrictions of molding cutter contour and the thickness of assembly cutter, and stretched limit.
    Cutting timber is characterized by high speed cutting, the rotation speed of the milling cutters mostly above 3000 rpm. High speed cutting for timber brings high productivity and smooth surface .., it also brings a series of security problems. Therefore, when the spindle speed up to 9000 rpm, besides the cutter which diameter smaller than 16mm, it should prohibit to use assembly cutters and do strict testing and inspection for welding cutter.
    It is necessary to limit chip thickness for avoiding overload of cutters. For end mills, the clamping method, cutter height, and thickness of work piece are with close relationship. When you ensure the thickness of work piece, mill diameter, and center diameter, the height of cutter reflects its own strength, stiffness, and capacity of cutting resistance. The height must be limited to ensure the safety of cutter usage.
    The design point of welding end mills is clamping problem. No matter the body is cylindrical or disc-type, the blade clamp form must be guaranteed to provide sufficient clamping force to resist rotation centrifugal force .
Reference sources – China Timber Net

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