1. Diamond particle size
Selection of diamond particle size When the diamond particle size is coarse and is a single particle size, the blade of the blade is sharp and the sawing efficiency is high, but the bending strength of the diamond agglomerate is reduced; when the diamond particle size is fine or the coarse and fine particle size is mixed, the blade of the blade is durable The degree is high, but the efficiency is low. Considering the above factors comprehensively, it is more appropriate to choose a diamond particle size of 50/60 mesh.
2. Diamond distribution concentration
The choice of diamond distribution concentration is 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; but if the concentration is too high, the saw blade will become dull. With low concentration and coarse particle size, the efficiency will increase.
Using the different functions of each part of the blade during sawing, different concentrations are used (that is, in the three-layer or more layer structure, the middle layer can use a lower concentration), and the middle groove is formed on the blade work during the sawing process. Helps prevent the saw blade from swinging, thereby improving the quality of stone processing.
3. Diamond strength
Selection of diamond strength Diamond strength is an important indicator to ensure cutting performance.
Too high strength will make the crystal difficult to break, the abrasive particles are polished during use, and the sharpness decreases, resulting in deterioration of tool performance; when the diamond strength is not enough, it is easy to break after being impacted, and it is difficult to shoulder the heavy responsibility of cutting. Therefore, the intensity should be selected from 130 to 140N.
4. Adhesive
Selection of binder The performance of the saw blade does not only depend on the diamond, but on the overall performance of the composite material of the cutter head composed of diamond and the binder.
For soft stones such as marble, the mechanical properties of the cutter head are required to be relatively low, and copper-based adhesives can be used.
However, the copper-based binder has a low sintering temperature, low strength and hardness, high toughness, and low bonding strength with diamond.
When tungsten carbide (WC) is added, WC or W2C is used as the framework metal, with an appropriate amount of cobalt to improve strength, hardness and bonding characteristics, and a small amount of Cu, Sn, Zn and other metals with low melting point and low hardness are used for bonding phase. The particle size of the main additive component should be finer than 200 mesh, and the particle size of the additive component should be finer than 300 mesh.
5. Sintering process
Selection of sintering process As the temperature increases, the densification of the carcass increases, and the flexural strength also increases, and with the extension of the holding time, the flexural strength of the blank carcass and diamond agglomerate increases first and then decreases. , You can choose 120s sintering process at 800 ℃ to meet the performance requirements. The so-called price is divided by price, but it does not mean that the most expensive one must be the best. The choice of diamond head should be based on the stone to be cut, and the head should be selected according to the stone.
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