How to Choose the Suitable Tools for Metal Processing(二)

B5 Quenched and tempered steel, pre-hardened steel (HRC30~45)

●High strength and hardness, the processing difficulty is slightly higher than carbon steel
●Ensure the rigidity of the mechanical system
●The tool chooses a smaller entering angle and auxiliary angle
B6 Quenched and tempered steel, quenched steel (HRC45~55)
●Hardness and strength are difficult to process and the tool wears quickly
●Choose tools with high hardness, good wear resistance and good toughness
B7 Quenched and tempered steel, hardened steel, vermicular graphite cast iron, white cast
Iron, high-alloy wear-resistant cast iron, etc. (HRC55~60)
●High hardness, low thermal conductivity and dispersed fine carbide hard spots
●Heavy load on the cutting edge of the tool and fast wear
●Tungsten carbide tools with fine particles with good red hardness, good wear resistance, high strength and moderate bending strength should be used
B8 Quenched and tempered steel, quenched steel (HRC60~65)
●High hardness, high shear stress and high cutting resistance
●Using extremely fine particles of tungsten carbide cutting tools or ceramic cutting tools with high hardness, high rigidity and good bending strength
C1 super heat-resistant alloy steel

●The thermal conductivity is small, the work hardening is serious, and the tool is easy to wear.

●Under the medium and low cutting speed, it is easy to cold weld with the tool. At high temperature, the tool will undergo violent diffusion wear

C2 austenitic stainless steel
●High processing hardness and high temperature strength
●Small thermal conductivity, easy to extend, easy to generate knife edge
●High toughness tools should be used
●The feed speed should be increased to supply enough cutting oil
C3 internal heat alloy titanium alloy
●High strength, toughness, high chemical affinity with tools
●Fully cooling to control heat generation
C4 internal heat alloy nickel-cobalt alloy, high-nickel alloy cast iron, etc.
●Low thermal expansion material, high cohesion
●The more chromium in alloy cast iron, the more difficult it is to process
●Choose tools with large helix angle and sharp cutting edge
C5 high silicon aluminum alloy, super hard aluminum alloy
●Contains examples of high hardness, high cutting resistance
●The higher the silicon content, the greater the viscosity and the more serious the tool wear
●Choose high-hardness, high-rigidity tools
C6 die steel
●Contains hardened materials, high strength, high toughness, high hardness, wear resistance
●Choose high-rigidity tools suitable for high-speed machining
●The speed can be appropriately reduced and the feed rate can be increased
C7 high cobalt steel
●High strength, high toughness, serious work hardening
●Choose matching knives to improve the rigidity of tools and machinery
C8 cobalt chromium alloy
●Good corrosion resistance, good willfulness, good harmony
●Use a tool with good cutting breaking and wear resistance



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