Cutting Gear Manufacturers Talk about Good Cutting Body Materials for Cutting Gears of Tunneling Machines

Cutting Gear Manufacturers Talk about Good Cutting Body Materials for Cutting Gears of Tunneling Machines
Excavator teeth are one of the vulnerable parts in coal mining and tunnel excavation machinery, and are the main tools for coal falling and crushing. Their performance directly affects the production capacity and power consumption of the coal mining machine. Work stability and the service life of other related components. There are many types of cutting teeth, and the general structure is to embed a hard alloy cutting head on a low alloy structural steel cutting body that has been quenched and tempered. Hijacking can withstand high cyclic compressive stress, shear stress, and impact loads during work. The main forms of failure are the detachment of the cutting head, the collapse of the blade, and the wear and tear of the cutting head and body. Manufacturers of rotary excavator cutting teeth often directly affect the service life of the cutting teeth under certain working conditions due to the mechanical performance of the cutting body. Therefore, selecting the material of the cutting body and effective heat treatment methods reasonably has a positive significance in reducing the wear and fracture of the cutting blade body, reducing the consumption of coal mining, improving the mechanical operation rate of the coal mining machine, and increasing the comprehensive economic benefits of coal mining production.
When cutting coal and rock, rotary excavator cutter manufacturers bear high cyclic compressive stress, shear stress, and impact load. Although the hardness of coal is not very high, it often encounters hard minerals such as coal gangue. During the cutting process of coal and rock, friction and impact can cause the temperature of the cutter to rise. For cutters working under such complex working conditions, it is required that their cutter body should be both wear-resistant and have good impact resistance. The cutter body is generally made of low alloy structural steel.
From the actual use of imported and domestically produced cutting teeth in some domestic coal mines, the material of the cutter body is mostly 42CrMo, 35CrMnSi and other steel grades, and some coal mines are also using newly developed Si Mn Mo series quasi bainitic steel in China.
42CrMo steel has high strength, high hardenability, good toughness, small quenching deformation, and high creep and tensile strength at high temperatures. After heat treatment, 42CrMo steel has good low-temperature impact toughness.
35CrMnSi steel is also a material with good hardenability. After appropriate heat treatment, it can obtain comprehensive mechanical properties with good strength, hardness, toughness, and fatigue strength, which can adapt to the complex working conditions of coal mining production.