Common Materials for Milling Bur
When talking about its composite items, there are two kinds of common materials for milling bur. They are named high-speed tool steel and cemented carbide.
1) High-speed tool steel, divided into 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. It can still maintain a high hardness at a high temperature of 600 ° C.
b. The cutting edge has good strength and toughness, strong vibration resistance, and can be used to manufacture tools with average cutting speed. For machine tools with poor rigidity, high-speed steel milling bur can still be cut smoothly.
c. The process performance is good, forging, machining and sharpening are relatively easy, and tools with complex shapes can also be manufactured.
d. Compared with cemented carbide materials, there are still disadvantages such as lower hardness, poor red hardness and wear resistance.
2) Cemented carbide: It is made of metal carbide, tungsten carbide, titanium carbide and cobalt-based metal binder by powder metallurgy process. Its main features are as follows:
a. It can withstand high temperature and can still maintain good cutting performance at about 800-1000 ° C. When cutting, a cutting speed 4-8 times higher than that of high-speed steel can be selected.
b. High hardness at room temperature and good wear resistance.
c. Low bending strength, poor impact toughness, and the blade is not easy to sharpen.
Commonly used cemented carbide can generally be divided into three categories: tungsten and cobalt carbide, titanium-cobalt carbide and general-purpose cemented carbide.
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