Analysis on the reason of edge broken of diamond saw blade
1. Selection of diamond strength
The strength of diamond is an important index to ensure the cutting performance. High strength will make the crystal is not easy to break, the abrasive particles are polished in use, sharpness decreased, resulting in deterioration of tool performance. When the strength of diamond is not enough, it is easy to be broken after impact and difficult to undertake the heavy cutting task. Therefore, the strength should be between 130 and 140N.
2. The choice of bond
The performance of the saw blade does not only depend on the diamond, but on the overall performance of the composite material formed by the diamond saw blade and the binder properly matched. For soft stone 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 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, and an appropriate amount of cobalt is added 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 phase. The particle size of the main ingredients should be finer than 200 meshes, and the particle size of the added ingredients should be finer than 300 meshes.
3. Selection of sintered
As the temperature increases, the densification degree of the carcass increases, and the bending strength also increases. With the extension of the holding time, the bending strength of the blank carcass and diamond agglomerates first increases and then decreases. The sintering process at 800°C for 120s meets the performance requirements.