Particle size

The commonly used diamond particle size is in the range of 30/35 to 60/80. The harder the rock, the finer the particle size should be. Because under the same pressure conditions, the finer the diamond, the sharper it is, which is conducive to cutting into hard rocks. In addition, generally large-diameter saw blades require high sawing efficiency, so it is advisable to use coarser particle sizes, such as 30/40, 40/50; small-diameter saw blades have low sawing efficiency and require smooth sawing sections, so it is advisable to use finer particle sizes, such as 50/60, 60/80.

Segment concentration

The so-called diamond concentration refers to the density of diamond distribution in the working layer matrix (that is, the weight of diamonds contained per unit area). The "Specification" stipulates that when there are 4.4 carats of diamonds in each cubic centimeter of the working matrix, its concentration is 100%, and when there are 3.3 carats of diamonds, its concentration is 75%. Volume concentration indicates the volume occupied by diamonds in the agglomerate, and stipulates that the concentration is 100% when the volume of diamonds accounts for 1/4 of the total volume. Increasing the diamond concentration is expected to extend the life of the saw blade, because increasing the concentration reduces the average cutting force on each diamond. However, increasing the concentration will inevitably increase the cost of the saw blade, so there is an economic concentration, and this concentration increases with the increase in sawing rate.

Segment hardness

Generally speaking, the higher the hardness of the binder, the stronger its wear resistance. Therefore, when sawing abrasive rocks, the binder hardness should be high; when sawing soft rocks, the binder hardness should be low; when sawing abrasive and hard rocks, the binder hardness should be moderate.

Effect

During the process of cutting stone, diamond circular saw blades will be subjected to alternating loads such as centrifugal force, sawing force, and sawing heat.

Due to force effect and temperature effect, diamond circular saw blades are worn and damaged.

Force effect: During the sawing process, the saw blade is subjected to axial force and tangential force. Due to the force in the circumferential and radial directions, the saw blade is wavy in the axial direction and disc-shaped in the radial direction. Both deformations will cause uneven rock cut surface, more stone waste, loud noise and increased vibration during sawing, resulting in early breakage of diamond agglomerates and reduced saw blade life.

Temperature effect: Traditional theory believes that the influence of temperature on the saw blade process is mainly manifested in two aspects: one is the graphitization of diamonds in the agglomerates; the other is the thermal stress between diamonds and the matrix, which causes the diamond particles to fall off prematurely. New research shows that the heat generated during the cutting process is mainly transmitted to the agglomerates. The temperature in the arc zone is not high, generally between 40 and 120°C. The temperature at the grinding point of the abrasive is relatively high, generally between 250 and 700°C. The coolant only reduces the average temperature in the arc zone, but has little effect on the abrasive temperature. Such a temperature will not cause graphite carbonization, but will change the friction performance between the abrasive and the workpiece, and cause thermal stress between the diamond and the additive, which will lead to a fundamental change in the failure mechanism of diamond. Studies have shown that temperature effect is the biggest factor affecting saw blade breakage.