戻る
Depending on the characteristics (hardness and toughness) of the tool material, various types are used.
Hardness: The harder it is, the less likely it is to wear, but it is easy to break and chipping .
Toughness: The tougher it is, the harder it is to break, and the harder it is to chipping . If it is tough, it is easy to wear.
The "hardness" and "toughness" of the tool material are contradictory properties.
1) Carbide
It does not soften even at high temperatures (high-speed cutting increases the calorific value), and since it has high compressive strength, it is difficult to deform such as blade crushing, and it is hard.
2) Hyss
It has high toughness and can withstand even at feed rates that would break with carbide.
Even if the hard carbide breaks with a snap, the high-speed can be avoided by bending.
3) Names of other typical tool materials
PCD: Polycrystalline diamond (diamond powder sintered at high temperature and pressure)
CBN: Cubic boron nitride (solidified boron nitride compound, borazone)
Ceramics: ceramics (in a broad sense), metal oxides (in a narrow sense)
Glass, cement cermets: Composites of ceramics + metal (carbide)
SKS: Alloy tool steel (semi-high-speed) - Compared to high-speed steel, the hardness cannot be obtained because the carbide is extremely low, but the toughness is 2~3 times that of the huis.