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Basic knowledge of tungsten carbide machine knife materials
- Jul 18, 2018 -

Carbide blade material is the most widely used type of high speed machining (HSM) cutting tool material, this kind of material is produced by powder metallurgy process, by hard carbide (usually a tungsten carbide WC) particles and the quality of a material soft metal bond. At present, there are hundreds of different tungsten steel blade different composition of WC cemented carbide, most of them are using cobalt (C o) as binder, nickel (N I) and chromium (Cr) is the commonly used binder elements, in addition you can also add other alloying elements.

 

Hardness and toughness

 

WC-co and carbide blade materials have unique advantages in both hardness and toughness. Tungsten carbide (WC) itself has a high hardness (higher than corundum or alumina), and its hardness rarely decreases when the working temperature increases. However, it lacks enough toughness, which is essential for cutting tool performance. Food cutter is designed to make use of high hardness of tungsten carbide and improve its toughness. People use metal bond to tungsten carbide together, so that the material has far more than the hardness of high speed steel, at the same time, to withstand cutting force in most machining.

 

Milling process


Tungsten carbide powder is obtained by carburizing tungsten (W) powder. The properties of tungsten carbide powder (especially its grain size) are mainly determined by the size of raw tungsten powder and the temperature and time of carburizing. Chemical control is also essential, and carbon content must remain constant (close to the theoretical ratio of 6.13 percent by weight). In order to control the powder size through subsequent processes, a small amount of vanadium and/or chromium can be added before carburizing.

 

Hardness and toughness

 

WC-Co cemented carbide has unique advantages in both hardness and toughness. Tungsten carbide (WC) itself has a high hardness (higher than corundum or alumina), and its hardness rarely decreases when the working temperature increases. However, it lacks enough toughness, which is essential for cutting tool performance. Carbide blade material in order to use tungsten carbide of high hardness, and to improve its toughness, people will use metal bond tungsten carbide together, so that the material has far more than the hardness of high speed steel, at the same time, to withstand cutting force in most machining. In addition, it can withstand the cutting high temperature produced by high speed machining.