The diamond segment is the working body of the diamond saw blade. The cutter head of the diamond saw blade is composed of diamond and matrix binder. Diamond is a superhard material that acts as a cutting edge. The matrix binder plays the role of fixing diamond. It is composed of simple metal powder or metal alloy powder Composition, different compositions are called formulas, and formulas are different from diamonds according to different uses.

1. Selection of diamond particle size

When the diamond particle size is coarse and single particle size, the saw blade head is sharp and the sawing efficiency is high, but the bending strength of the diamond agglomeration decreases; when the diamond particle size is fine or the coarse and fine particle sizes are mixed, the saw blade head has high durability, but less efficient. Taking the above factors into consideration, it is more appropriate to choose 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 cutting efficiency of the saw blade will gradually decrease, while the service life will gradually prolong; but if the concentration is too high, the saw blade will become blunt. And the use of low concentration, coarse particle size, the efficiency will be improved. Utilizing the different functions of each part of the cutter head during sawing, different concentrations are used (that is, a lower concentration can be used in the middle layer in a three-layer or more layer structure), and a middle groove is formed on the cutter head during the sawing process, which has a certain effect. It is beneficial to prevent the saw blade from deflecting, thereby improving the quality of stone processing.

3. Selection of diamond strength

The strength of diamond is an important indicator to ensure cutting performance. Too high strength will make the crystal not easy to break, the abrasive grains will be polished during use, and the sharpness will decrease, resulting in deterioration of tool performance; when the diamond strength is not enough, it will be easily broken after being impacted, and it is difficult to bear the heavy responsibility of cutting. Therefore, the strength should be selected at 130-140N

4. Selection 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 diamond saw blade and the cutter head formed by the proper cooperation of the binder. For soft stone materials such as marble, the mechanical properties of the cutter head are required to be relatively low, and copper-based binders can be used. However, the sintering temperature of the copper-based binder is low, the strength and hardness are low, the toughness is high, and the bonding strength with diamond is low. When tungsten carbide (WC) is added, WC or W2C is used as the skeleton metal, with an appropriate amount of cobalt to improve the strength, hardness and bonding characteristics, and a small amount of Cu, Sn, Zn and other metals with low melting point and low hardness are added for bonding Mutually. The particle size of the main ingredients should be finer than 200 mesh, and the particle size of the added ingredients should be finer than 300 mesh

5. Selection of sintering process

As the temperature increases, the degree of 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 agglomerates first increases and then decreases. Sintering at 800°C for 120s to meet performance requirements.