Factors affecting the efficiency and life of diamond circular saw blades include sawing process parameters, diamond particle size, concentration, and bond hardness. The sawing parameters are saw blade line speed, sawing density, and feed speed.

1. Linear speed of saw blade: In actual work, the linear speed of a diamond circular saw blade is limited by equipment conditions, saw blade quality, and the nature of the stone being sawed. From the perspective of the best saw blade service life and sawing efficiency, the linear speed of the saw blade should be selected according to the properties of different stones. When sawing granite, the linear speed of the saw blade can be selected within the range of 25m to 35m/s. For granite with high quartz content which is difficult to say, the lower limit of the linear speed of the saw blade is appropriate. When producing granite tiles, the diameter of the diamond circular saw blade used is small, and the linear speed can reach 35m/s.

Sawing depth: Sawing depth is an important parameter involving diamond wear, effective sawing, force on the saw blade, and the properties of the stone being sawed. Generally speaking, when the linear speed of the diamond circular saw blade is high, a small cutting depth should be selected. From the current technology, the depth of sawing diamond can be selected between 1mm and 10mm. Generally, when cutting granite blocks with large-diameter saw blades, the cutting depth can be controlled between 1mm and 2mm, and at the same time, the feed speed should be reduced. When the linear speed of the diamond circular saw blade is large, a large depth of cut should be selected. However, when the performance of the saw machine and the strength of the tool allow, the cutting concentration should be taken as large as possible to improve the cutting efficiency. When there is a requirement for the machined surface, a small depth cut should be used.

Feed speed: The feed speed is the feed speed of the stone being sawed. Its size affects the cutting rate, the force on the saw blade, and the heat dissipation in the sawing area. Its value should be selected according to the nature of the stone being sawn. Generally speaking, when sawing soft stone, such as marble, the feed speed can be appropriately increased. If the feed speed is too low, it is more conducive to improving the sawing rate. When sawing fine-grained and relatively homogeneous granite, the feed speed can be appropriately increased. If the feed speed is too low, the diamond blade will be easily ground. However, when sawing granite with a coarse-grained structure and uneven hardness, the feed speed should be reduced, otherwise, it will cause the saw blade to vibrate and cause the diamond to break and reduce the sawing rate. The feed speed for sawing granite is generally selected within the range of 9m to 12m/min.

2. Other influencing factors:

Diamond particle size: The commonly used diamond particle size is in the range of 30/35 to 60/80. The harder the rock, the finer grain size should be selected. Because under the same pressure conditions, the finer and sharper the diamond is, which is conducive to cutting into hard rocks. 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, requiring smooth rock sawing sections, and should Use a finer granularity, such as 50/60, 60/80.

Tool head concentration: The so-called diamond concentration refers to the density of diamonds distributed in the matrix of the working layer (ie the weight of diamonds contained in a unit area). The “Specification” states that the concentration of 4.4 carats of diamond per cubic centimeter of the working matrix is ​​100% and that of 3.3 carats of diamond 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 depth 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 cut-rate.

3. The hardness of the cutter head binder: Generally speaking, the higher the hardness of the binder, the stronger its anti-wear ability. 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

Fourth, force effect, temperature effect and grinding damage: 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. The wear and tear of the diamond circular saw blade is caused by the force effect and the temperature effect.

① Force effect: During the sawing process, the saw blade is subjected to the action of 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 dish-shaped in the radial direction. These two kinds of deformation will cause uneven rock sections, waste of stone material, loud noise, and intensified vibration during sawing, resulting in early damage of diamond agglomeration and shortening of saw blade life.

② Temperature effect: The traditional theory believes that the influence of temperature on the saw blade process is mainly manifested in two aspects: one is to cause the graphitization of diamond in the agglomeration; the other is to cause the thermal force between the diamond and the matrix to cause premature diamond particles to fall off. New research shows that the heat generated during the cutting process is mainly transferred to the agglomerates. The arc zone temperature is not high, generally between 40 and 120 °C. The abrasive grinding point temperature is relatively high, generally between 250 ~ 700 ℃. The coolant only reduces the average temperature of the arc zone but has little effect on the temperature of the abrasive particles. Such a temperature will not cause carbonization of graphite, but will change the friction properties between the abrasive particles and the workpiece, and cause thermal stress between the diamond and the additive, resulting in fundamental bending of the failure mechanism of the diamond. Studies have shown that temperature effects are the biggest factor in breaking saw blades.

③ Wear damage: Due to the force effect and temperature, the saw blade will often be worn and damaged after a period of use. The main forms of abrasion damage are as follows: abrasive wear, local crushing, large-scale crushing, falling off, and mechanical abrasion of the binder along the direction of the sawing speed. Abrasive wear: The diamond particles are constantly rubbed against the workpiece, the edges are passivated into a flat surface, the cutting performance is lost, and the friction is increased. The heat of sawing will cause a graphitized thin layer on the surface of the diamond particles, the hardness will be greatly reduced, and the wear will be aggravated: the surface of the diamond particles is subjected to alternating thermal stress and alternating cutting stress, and fatigue cracks will appear and partially break, revealing A sharp new edge is an ideal wear pattern; large-scale crushing: diamond particles are subjected to impact load when cutting in and out, and the more prominent particles and grains are consumed prematurely; falling off: alternating cutting forces make diamond The particles are constantly shaken in the binder to loosen. At the same time, the wear of the bond itself during sawing and the heat of sawing soften the bond. This reduces the holding force of the bond, and when the cutting force on the particles is greater than the holding force, the diamond particles will fall off. Either type of wear is closely related to the load and temperature to which the diamond particles are subjected. And both of them depend on the cutting process and cooling and lubrication conditions.