CNC lathe commonly used tool material classification

1. high speed steel;

CNC lathe parameters of high-speed steel refers to the high alloy tool steel containing more tungsten, chromium, molybdenum, vanadium and other alloying elements. High-speed steel can be divided into ordinary high-speed steel and high-performance high-speed steel according to different uses.

General high speed steel has a certain hardness (63-66HRC), wear resistance, high strength and toughness. When processing ordinary steel, the cutting speed is 50-60 m/min, which is not suitable for high-speed cutting and superhard material processing. W18Cr4V and W6Mo5Cr4V2 are the main brands. The latter is superior to the latter in strength and toughness, but the thermal stability is poor.

2. hard alloy hard alloy;

Powder metallurgy products, made of high hardness, high melting point hard alloy (WC, TiC, TaC, NbC, etc.). Co, Mo, Ni and other elements as a binder. Its room temperature hardness can reach 78-82HRC, can be used at high temperatures of 800-1000 ℃, and its cutting speed is 4-10 times that of high-speed steel. However, its impact toughness and bending strength are much lower than high-speed steel, so it is rarely used as a whole tool. In practice, the cemented carbide tool block is usually fixed to the tool body by welding or mechanical clamping.

Commonly used hard alloy has the following three kinds;

1. Tungsten carbide cobalt (code YG) is composed of tungsten carbide and cobalt.

This cemented carbide has good toughness, but poor hardness and wear resistance, and is suitable for processing brittle materials (such as cast iron, etc.). The more Co in the tungsten carbide cobalt, the better the toughness. Commonly used brands are: YG8, YG6, YG3, the tool in order of roughing, semi-finishing and finishing.

2. Tungsten carbide titanium cobalt (code YT) is composed of tungsten carbide, titanium carbide and cobalt.

This cemented carbide has good heat resistance and wear resistance, but poor impact toughness, suitable for cutting strip steel and other plastic materials. Commonly used grades are YT5, YTl5, YT30, etc., where the number represents the content of titanium carbide. The higher the titanium carbide content, the better the wear resistance and the lower the toughness. Tungsten, titanium, cobalt three brands of tools are suitable for roughing, semi-finishing and finishing.

3. Tungsten titanium tantalum (niobium) cemented carbide (code YW) is composed of tungsten titanium cobalt cemented carbide with a small amount of tantalum carbide (TaC) or niobium carbide (NbC).