1. Selection of diamond particle size
When the diamond size is coarse and single, the blade head is sharp and the cutting efficiency is high, but the bending strength of diamond agglomeration decreases. When the diamond granularity is fine or mixed, the saw blade head has high durability but low efficiency. Considering the above factors, 50/60 mesh diamond size is suitable.
2. Selection of diamond distribution concentration
In a certain range, when the diamond concentration changes from low to high, the sharpness and cutting efficiency of the saw blade gradually decrease, but the service life is gradually extended. But if the concentration is too high, the blade will become dull. Using low concentration, coarse grain size, efficiency will be improved. The use of different parts of the tool head in sawing, using different concentrations (that is, in three layers or more layers of the structure of the middle layer can be used to lower concentration), the process of the saw head work on the formation of the middle groove, conducive to prevent the saw blade pendulum, so as to improve the quality of stone processing.
3. Selection of diamond strength
The strength of diamond is an important index to ensure the cutting performance. Too high strength will make the crystal is not easy to break, abrasive particles are polished in use, sharpness decreases, leading to the deterioration of tool performance; When the strength of diamond is not enough, it is easy to be broken after impact and difficult to bear the heavy duty of cutting. Therefore, the intensity should be selected in 130 ~ 140N. 4. Selection of bonding phase
The performance of the saw blade depends not only on the diamond, but also on the overall performance of the composite material which is formed by the proper combination of diamond and binder. For marble and other soft stone, the mechanical properties of the tool head is relatively low, can choose copper base binder. But the sintering temperature of copper base binder is low, the strength and hardness are low, the toughness is high, and the bonding strength with diamond is low. When WC is added, WC or W2C is used as the skeleton metal, with 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 hardness are added as the bonding phase. The particle size of the principal additive component should be finer than 200 mesh, and the particle size of the additive component should be finer than 300 mesh.
5. Selection of sintering process
With the increase of temperature, the degree of densification of the carcass increases, so does the bending strength. However, with the extension of holding time, the bending strength of blank carcass and diamond agglomeration first increases and then decreases. The sintering process of 120s at 800℃ can be selected to meet the performance requirements.
Post time: Feb-04-2023