Influencing Factors Of Diamond Saw Blade

1. Granularity
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 selected. Because under the same pressure conditions, the finer the diamond, the sharper it is, which is conducive to cutting into hard rock. In addition, generally large-diameter saw blades require high sawing efficiency, and coarser particle sizes should be selected, such as 30/40, 40/50; small-diameter saw blades have low sawing efficiency, and rock sawing sections are required to be smooth. Choose a finer grain size, such as 50/60, 60/80.
2. Blade concentration
The so-called diamond concentration refers to the density of diamond distribution in the matrix of the working layer (that is, the weight of diamond contained in a unit area). The "standard" stipulates that when the working matrix contains 4.4 carats of diamonds per cubic centimeter, its concentration is 100%, and when it contains 3.3 carats of diamonds, its concentration is 75%. The volume concentration indicates the volume of diamond in the agglomerate, and it is stipulated that when the volume of diamond accounts for 1/4 of the total volume, the concentration is 100%. Increasing the diamond concentration is expected to prolong the life of the saw blade, because increasing the concentration reduces the average cutting force per diamond. However, increasing the concentration will inevitably increase the cost of the saw blade, so there is a most economical concentration, and the concentration increases with the increase of the sawing rate.
3. Blade hardness
In general, the higher the hardness of the bond, the stronger its wear resistance. Therefore, when sawing abrasive rocks, the hardness of the binder should be high; when sawing soft rocks, the hardness of the binder should be low; when sawing abrasive and hard rocks, the hardness of the binder should be moderate .
4. Effect
In the process of cutting stone, the diamond circular saw blade will be subjected to alternating loads such as centrifugal force, sawing force, and sawing heat.
Wear and tear of diamond circular saw blades due to force effects and temperature effects.
Force effect: During the sawing process, the saw blade is subjected to axial force and tangential force. Due to the force in the circumferential direction and the radial direction, the saw blade is wavy in the axial direction and disc-shaped in the radial direction. These two deformations will cause the rock cut surface to be uneven, waste more stone, make noise and aggravate vibration during sawing, cause early damage to diamond agglomeration, and reduce the life of the saw blade.
Temperature effect: The traditional theory holds that the influence of temperature on the saw blade process is mainly manifested in two aspects: one is the graphitization of the diamond in the agglomeration; the other is the thermal stress between the diamond and the carcass, which causes the diamond particles to fall off prematurely. New research shows that the heat generated during the cutting process is mainly transferred to the agglomerates. The temperature in the arc zone is not high, generally between 40 and 120 °C. However, the temperature of the abrasive grinding point is relatively high, generally between 250 and 700 °C. The coolant only reduces the average temperature of the arc area, but has little effect on the temperature of the abrasive grains. Such a temperature does not cause graphite carbonization, but it will change the frictional properties between the abrasive grains and the workpiece, and cause thermal stress between the diamond and the additive, resulting in a fundamental change in the failure mechanism of the diamond. Studies have shown that temperature effects are the biggest contributor to blade breakage.
Wear and tear: Due to the force effect and temperature response, saw blades tend to wear and tear after a period of use. The forms of wear and tear mainly include the following types: abrasive wear, local crushing, large area crushing, shedding, and mechanical abrasion of the bonding agent along the sawing speed direction. Abrasive wear: The diamond particles are constantly rubbing against the workpiece, and the edges are passivated into planes, losing cutting performance and increasing friction. The heat of sawing will cause a graphitized thin layer on the surface of the diamond particles, greatly reducing the hardness and aggravating wear: the surface of the diamond particles is subjected to alternating thermal stress and alternating cutting stress, and fatigue cracks will appear and partially broken, revealing Sharp new edges are formed, which is an ideal form of wear; large-area crushing: diamond particles are subjected to impact loads when cutting in and out, and the more prominent particles and grains are consumed prematurely; shedding: alternating cutting forces make diamonds The particles are constantly shaken in the binder to loosen them. At the same time, the abrasion of the bonding agent itself and the heat of sawing during the sawing process soften the bonding agent. This reduces the holding force of the binder, and when the cutting force on the particles is greater than the holding force, the diamond particles will fall off. No matter which kind of wear is closely related to the load and temperature borne by diamond particles. Both of these depend on the sawing process and cooling and lubrication conditions.