If you really know the key point of carbide woodworking tools?
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If you really know the key point of carbide woodworking tools?
Zhuzhou Cemented Carbide knife has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc., especially its high hardness and wear resistance, even at a temperature of 500 ℃, it is basically not Change, still high hardness at 1000 ℃. The material used in cemented carbide is widely used as tool materials, such as turning tools, milling cutters, planers, drills, boring cutters, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone, and ordinary steel. It can be used to cut difficult-to-machine materials such as heat-resistant steel, stainless steel, high manganese steel, and tool steel.
Some of the factors that affect the characteristics and applications of cemented carbide tools include:
(1) Challenging workpiece materials. Including alternative metal materials and difficult-to-process alloy materials. The workability of some of these materials is less than 1/4 of steel, and the price of some materials can be as high as hundreds of dollars per pound.
(2) Increasingly complex geometry of workpieces. For example, thin-walled workpieces and aerospace parts with complex shapes.
(3) Large size workpiece. Especially the demand for turbines and various heavy machinery parts is increasing. The high cost per piece of these workpieces puts high demands on the machining of carbide tools.
(4) Increasingly special quality and performance requirements. For example, the requirements for the surface fatigue strength of the processed parts.
Analysis of the determinants of the quality of cemented carbide tools:
(1) Hardness and toughness
Cemented carbide tools have unique advantages in both hardness and toughness. Tungsten carbide (WC) itself has a very high hardness (more than corundum or alumina), and its hardness rarely decreases when the working temperature rises. However, it lacks sufficient toughness, which is essential for cutting tools. In order to take advantage of the high hardness of tungsten carbide and improve its toughness, people use a metal bond to bond tungsten carbide together, so that this material has a hardness far exceeding that of high-speed steel, and at the same time can withstand most cutting processes. Cutting force. In addition, it can withstand the high temperature of high-speed machining.
Therefore, the suitability of cemented carbide tool performance and specific processing depends to a large extent on the original powdering process.
(2) Pulverizing technology of cemented carbide tools
Tungsten carbide powder is obtained by carburizing tungsten (W) powder. The characteristics of tungsten carbide powder (especially its particle size) mainly depend on the particle size of the raw tungsten powder and the temperature and time of carburizing. Chemical control is also critical, and the carbon content must be kept constant (close to the theoretical ratio of 6.13% by weight). In order to control the particle size of the powder through subsequent processes, a small amount of vanadium and/or chromium can be added before the carburizing treatment. Different process conditions and different processing uses of cemented carbide tools require specific combinations of tungsten carbide particle size, carbon content, vanadium content and chromium content. Through the changes of these combinations, various tungsten carbide powders can be produced.
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