1, The choice of diamond particle size
When the diamond has a coarse grain size and a single particle size, the blade blade is sharp and the sawing efficiency is high, but the bending strength of the diamond agglomerate is decreased; when the diamond particle size is fine or coarse and fine particle size is mixed, the blade blade has high durability, but Less efficient. Taking into account the above factors, it is more appropriate to select a diamond particle size of 50/60 mesh.
2. Selection of diamond distribution concentration
Within a certain range, when the diamond concentration changes from low to high, the sharpness and sawing efficiency of the saw blade gradually decrease, and the service life is gradually extended; however, if the concentration is too high, the saw blade becomes dull. With low concentration and coarse particle size, the efficiency will increase. The different effects of different parts of the cutter head during sawing are adopted, that is, the intermediate layer can adopt a lower concentration in the three-layer or more layer structure, and the middle groove is formed on the cutter head during the saw blade process, It helps to prevent the yaw of the saw blade and improve the quality of stone processing.
3, The choice of diamond strength
The strength of diamond is an important indicator to ensure cutting performance. Excessive strength will make the crystal difficult to break, the abrasive grains will be polished during use, and the sharpness will decrease, which will lead to deterioration of tool performance. When the diamond strength is insufficient, it will be easily broken after being impacted, and it is difficult to bear the heavy duty of cutting. Therefore, the strength should be selected from 130 to 140N.
4, The choice of binder phase
The performance of the saw blade does not depend solely on the diamond, but on the overall performance of the composite material of the cutter head formed by the proper fit of the diamond and the binder. For soft stone such as marble, the mechanical properties of the cutter head are required to be relatively low, and a copper-based binder may be selected. However, the copper-based binder has a low sintering temperature, low strength, low hardness, high toughness, and low bonding strength with diamond. When adding tungsten carbide (WC), WC or W2C is used as the framework metal, and an appropriate amount of cobalt is added to improve the strength, hardness and bonding characteristics, and a small amount of low-melting, low-hardness Cu, Sn, Zn and other metals are bonded. phase. The particle size of the main additive should be less than 200 mesh, and the particle size of the added component should be finer than 300 mesh.
5, The choice of sintering process
As the temperature increases, the degree of densification of the carcass increases, and the flexural strength increases. As the holding time increases, the flexural strength of the blank carcass and diamond agglomerates increases first and then decreases. Sintering at 800 ° C for 120 s to meet performance requirements.
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