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The cause of the fracture of the diamond saw blade
- May 08, 2018 -

In recent years, the development of construction industry has led to the development of building materials industry in China. The vast market capacity has greatly increased the demand for the steel used for diamond saw blade. At present, 20% of the steel used for diamond saw blade in China is still dependent on the import, and the quality of the domestic production of diamond saw blade steel is far from the demand of the market.

The main steel for diamond saw blade in China is medium high carbon spring steel. Because of its superior cutting performance and wear resistance, it is widely used in stone processing, highway and airport construction. However, because of the characteristics of the steel self alloy elements of the saw blade, many problems have been brought to the actual production and use, such as large heat treatment deformation, uneven hardness, crack and so on. There are many factors that produce cracks in the steel of the diamond saw blade. The main factors are the chemical composition of the steel, the defects of the raw materials, the original structure of the steel, the heating factor, the cooling factor, the characteristic of the structure of the saw blade, and so on, which result in the distribution of various stress in the surface of the body, especially the tensile stress in the surrounding area is greatly increased. A potential factor for forming a crack.

At present, the main steel of diamond saw blade is medium high carbon spring steel, and the non-metallic inclusion, unhomogeneous structure, micro crack and surface defect in medium high carbon spring steel can be the energy zone of fatigue crack, which causes the early failure of the saw blade matrix. The non-metallic inclusions, surface defects and strip segregation in medium high carbon spring steel are the main factors affecting the service life of the saw blade matrix, because the surface of the diamond saw blade has hemp pits, defects or dense distribution of carbide particles or strip segregation in the subsurface layer. These as fatigue sources promote the fatigue of the saw blade matrix. Invalid。 In addition, because of the low fracture toughness, the fatigue fracture of the SAW substrate is too early.