1. High-speed steel;
High-speed steel with CNC lathe parameters refers to high-alloy tool steel containing more alloying elements such as tungsten, chromium, molybdenum, and vanadium. 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 50-60m/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 is less thermally stable.
2. Cemented carbide;
Powder metallurgy products are made of hard alloys with high hardness and high melting point (WC, TiC, TaC, NbC, etc.). , Co, Mo, Ni and other elements as binders. Its room temperature hardness can reach 78-82HRC, it can be used at high temperature 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 those of high-speed steel, so it is rarely used as a solid tool. In practice, carbide inserts are usually fixed to the cutter body by welding or mechanical clamping.
There are three commonly used cemented carbides:
Introduction of CNC lathe
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 machining brittle materials (such as cast iron, etc.). The more Co in tungsten carbide cobalt, the better the toughness. Commonly used brands are: YG8, YG6, YG3, and the tools are roughing, semi-finishing and finishing in order.
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, and is suitable for cutting plastic materials such as strip steel. Commonly used grades are YT5, YTl5, YT30, etc., where the numbers represent the content of titanium carbide. The higher the titanium carbide content, the better the wear resistance and the lower the toughness. The three brands of tungsten, titanium and cobalt are suitable for roughing, semi-finishing and finishing respectively.
3. Tungsten-titanium-tantalum (niobium) cemented carbide (code YW) is composed of tungsten-titanium-cobalt cemented carbide and a small amount of tantalum carbide (TaC) or niobium carbide (NbC).