Introduction to the selection parameter standards of diamond saw blades

1. Selection of diamond particle size

When the diamond grit is coarse and of a single size, the saw blade head is sharp and the sawing efficiency is high, but the bending strength of the diamond agglomerate decreases. When the diamond grit is fine or a mixture of coarse and fine grit, the saw blade head is durable but the efficiency is low. Taking all the above factors into consideration, the diamond grit size of 50/60 mesh is more appropriate.

2. Selection of diamond distribution concentration

Within a certain range, as diamond concentration changes from low to high, the saw blade's sharpness and cutting efficiency gradually decrease, while its service life gradually increases. However, if the concentration is too high, the saw blade will become dull. Using a low concentration and coarse grain size, efficiency is improved. By utilizing the different roles played by different parts of the cutter head during sawing and using different concentrations (i.e., a lower concentration can be used for the middle layer in a three- or more-layer structure), a central groove is formed on the working surface of the cutter head during sawing, helping to prevent saw blade deflection and thus improving stone processing quality.

3. Selection of diamond strength

Diamond strength is a crucial factor in ensuring cutting performance. Too high a strength can make the crystal difficult to break, causing the abrasive grains to be polished during use, reducing sharpness and deteriorating tool performance. Insufficient diamond strength can easily break upon impact, making it difficult to perform the heavy cutting task. Therefore, a strength of 130-140N should be selected.

4. Selection of bonding phase

The performance of a saw blade does not depend solely on the diamond itself, but rather on the overall performance of the composite material, the cutter head, which is composed of a properly matched diamond and binder. For soft stone materials such as marble , the mechanical properties of the cutter head are relatively low, and a copper-based binder can be used. However, copper-based binders have a 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 skeleton metal, with an appropriate amount of cobalt to improve strength, hardness, and bonding properties, and a small amount of metals with low melting points and low hardness, such as Cu, Sn, and Zn, are added as a bonding phase. The particle size of the main additive should be finer than 200 mesh, and the particle size of the additive should be finer than 300 mesh.

5. Selection of sintering process

As the temperature rises, the densification of the matrix increases and the flexural strength also increases accordingly. Moreover, as the holding time increases, the flexural strength of the blank matrix and diamond agglomerates first increases and then decreases. The sintering process at 800°C for 120s can be selected to meet the performance requirements.