Brief Introduction of New Cutting Tool Materials

A, The using of non-metallic tool material: The hardness and wear resistance of ceramic, natural (synthetic) diamond and cubic boron nitride are higher than that of general metal cutting tool materials, which can be used for cutting hardened steel, non-ferrous metal, carbide materials, etc. Because the brittleness is high, and the bending strength is extremely low, coupled with expensive prices of diamond and cubic boron nitride materials, so they are rarely used.

B, The transformation of high speed steel: In order to improve the hardness and wear resistance of high speed steel, people often adopt the following measures.

a, To add new element in the high speed steel: For example, our aluminium high speed steel is added aluminum in the process of production, which can make its harndness up 70 HRC, heat resistance more than 600 ℃. It is also called high performance high speed steel or super high speed steel.

b, To improve the technique of cutting tool manufacturing: High speed steel made by powder metallurgy is called powder metallurgy high speed steel, which can eliminate segregation of carbide and refine grain, improve the toughness and hardness of the materials, and reduce the heat treatment deformation. It is suitable for manufacturing various high precision cutting tools.

C, The improvement of carbide: In order to overcome low strength and toughness and other shortcomings of low common cemented carbide, people often use the following measures.

a, To adjust the chemical composition: Adding a small amount of tantalum carbide (TaC) and niobium carbide (NbC), can make cemented carbide both high hardness and good toughness.

b, To refine grain of alloy: For example, ultra-fine grain cemented carbide’s hardness can reach 90 ~ 90HRA, and bending strength can be up to 2.0 GPa.

c, To use coating blade: On the substrate surface of cemented carbide with good toughness (such as YG), coating TiC and TiN of 5 ~ 10 microns can improve the surface wear resistance.