Choose Diamond Saw Blades According To Different Uses

The diamond bit is the main 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 metal powder or metal alloy powder Composition, different compositions are called formulas, and according to different uses, formulas and diamonds are different.

1. Selection of diamond strength

The strength of diamond is an important indicator to ensure cutting performance. If the strength is too high, the crystal will not be easily broken, the abrasive particles will be polished during use, and the sharpness will be reduced, which will lead to the deterioration of the tool performance; when the diamond strength is not enough, it will be easily broken after being impacted, and it is difficult to undertake the heavy duty of cutting. Therefore, the strength should be selected in the range of 130 to 140N

2. 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 diamond agglomeration decreases; when the diamond particle size is fine or coarse and fine particle size is mixed, the saw blade head has high durability, but less efficient. Considering the above factors, it is more appropriate to choose the diamond particle size as 50/60 mesh.

3. Selection of sintering process

With the increase of temperature, the degree of densification of the matrix increases, and the flexural strength also increases, and with the extension of the holding time, the flexural strength of the blank matrix and diamond agglomerates first increases and then decreases. Sintering at 800°C for 120s to meet the performance requirements.

4. 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, while 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 be improved. Taking advantage of the different functions of each part of the cutter head during sawing, different concentrations are used (that is, a lower concentration can be used for the middle layer in a three-layer or multi-layer structure). It is beneficial to prevent the saw blade from swaying, thereby improving the quality of stone processing.

5. Selection of binder phase

The performance of the saw blade depends not only on the diamond, but on the overall performance of the composite material of the cutter head formed by the proper combination of the diamond saw blade 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 binders can be used. However, the copper-based binder has 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 metals such as Cu, Sn, Zn, etc. with low melting point and low hardness are added for bonding. Mutually. 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.