The basic requirements for the milling cutter to cut part of the material
1) High hardness and wear resistance: At room temperature, the cutting part of the material must have enough hardness to cut into the workpiece, and with high wear resistance, the tool will not wear out and prolong the service life.
2) Good heat resistance: the tool will produce a lot of heat in the cutting process, especially when the cutting speed is high, the temperature will be very high, therefore, the tool material should have good heat resistance, both at high temperature can still maintain high hardness, and can continue to cut, this property with high temperature hardness, also known as hot hardness or red hardness.
3) High strength and good toughness: In the cutting process, the tool should withstand a large impact force, so the tool material should have high strength, otherwise it is easy to break and be damaged. Because the milling cutter will be subject to shock and vibration, therefore, the milling cutter material should also have good toughness, so that it is not easy to chip, chipping.
Common materials for milling cutters
1) High-speed tool steel (referred to as high-speed steel, front steel, etc.), which is divided into two types: general-purpose and special-purpose high-speed steel.
It has the following characteristics:
a. The content of alloying elements tungsten, chromium, molybdenum and vanadium is high, and the quenching hardness can reach HRC62-70. At a high temperature of 600°C, it can still maintain a high hardness.
b. Good edge strength and toughness, strong vibration resistance, can be used to manufacture tools with general cutting speed, for machine tools with poor rigidity, using high-speed steel milling cutters, can still cut smoothly.
c. The process performance is good, forging, processing and sharpening are relatively easy, and the shape of the tool can also be manufactured.
d. Compared with cemented carbide materials, there are still shortcomings such as low hardness, poor red hardness and wear resistance.
2) Cemented carbide: It is made of metal carbide, tungsten carbide, titanium carbide and metal binder based on cobalt by powder and metallurgical process.
