How To Select Diamond Blades For Different Uses
Diamond head is the working body of diamond saw blade. The head of the diamond blade is composed of diamond and tire binding agent, diamond is a super-hard material, play the role of cutting edge, tire binding agent plays the role of fixing diamond, by metal monomer powder or metal alloy powder, different composition is called formula, depending on the use, formula and diamond different.
1. Diamond strength selection
The strength of diamond is an important index to ensure cutting performance. Too high strength will make the crystal not easy to break, grinding particles in use is polished, sharpness decreased, resulting in deterioration of tool performance; When the diamond strength is not enough, it is easy to break after the impact, it is difficult to bear the heavy responsibility of cutting. Therefore, the intensity should be selected at 130 to 140N
2. Diamond granularity selection
When the diamond particle size is thick and single-grained, the blade head is sharp and the cutting efficiency is high, but the bending strength of diamond block decreases. When diamond particle size is fine or coarse particle size mixed, the blade head is durable but inefficient. Taking the above factors into account, it is more appropriate to choose diamond granularity of 50/60.
3. Choice of sintering process
With the increase of temperature, the density of the tire body increases, the resistance to bending also increases, and with the extension of the insulation time, the resistance strength of blank fetal body and diamond block is increased and then reduced, the sintering 120s process can be selected at 800 degrees C to meet the performance requirements.
4. Selection of diamond distribution concentration
In a certain range, when the diamond concentration changes from low to high, the sharpness and sawing efficiency of the blade gradually decrease, and the service life is gradually extended; However, the concentration is too high and the blade becomes dull. With low concentration and coarse grain size, the efficiency will be improved. Using the different effects of the cutting of various parts of the head, different concentrations (i.e. lower concentrations can be used in the middle layer of the three-layer or more layer structure), the middle groove is formed on the tool work during the sawing, which is conducive to preventing the blade skew, thus improving the quality of stone processing.
5. Choice of bonding phase
The performance of the blade depends not only on diamond, but on the overall performance of the composite material such as the head that the diamond blade fits properly with the binder. For soft stone such as marble, the hydraulic performance of the head is relatively low, and copper-based binders are available. However, copper-based binder sintering temperature is low, strength, hardness is low, toughness is high, and the binding strength of diamond is low. When tungsten carbide (WC) is added, WC or W2C is used as a skeleton metal, with the appropriate amount of cobalt to improve strength, hardness and binding characteristics, and a small amount of low melting point, low hardness Cu, Sn, Zn and other metals for bonding phase.
