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The sharpness of the diamond saw blade is influenced by many factors, and any change in one of the factors may change the sharpness of the diamond saw blade, thus affecting the user experience.
The commonly used diamond size is within 30/35 ~ 60/80 range. The harder the rock, the finer grain size. Because under the same pressure conditions, the diamond is finer and sharper, which helps to cut into the hard rock. In addition, generally large diameter saw blades require high cutting efficiency, which should be selected with coarser grain size, such as 30/40, 40/50; The small diameter saw blade has a low efficiency, which requires a smooth cutting section of the rock, which is suitable for fine particle size, such as 50/60,60/80.
Concentration of the cutting tools
The so-called diamond concentration refers to the density of the diamond in the working layer (i.e. the weight of the diamond in the unit area). The "specification" stipulates that the concentration of diamonds containing 4.4 carats per cubic centimeter of working body is 100%, and the concentration of diamond containing 3.3 carat is 75%. The volume concentration indicates the volume of the diamond in the lump, and stipulates that the concentration of diamond is 100% when the volume of the diamond is 1/4 of the total volume. Increasing the concentration of diamond can prolong the life of the saw blade, because increasing the concentration reduces the average cutting force of each diamond. However, increasing the concentration must increase the cost of the saw blade, so there is a most economical concentration, and the concentration increases with the increase of sawing rate.
The hardness of the cutting tools
Generally speaking, the higher the hardness of the binder, the stronger the resistance to wear. As a result, when sawing and grinding large rocks, the bond hardness is high; When sawing material soft rock, the bond hardness is low; When sawing and grinding large and hard rock, the bond hardness is appropriate.
In the process of cutting stone, diamond circular saw blade will be affected by centrifugal force, sawing force, sawing heat, etc.
Because of the force effect and temperature effect, the diamond circular saw blade is worn out.
Force effect: during sawing, the blade is affected by axial force and tangential force. Because of the force acting on the circumferential direction and the radial force, the saw blade is wavy in the axial direction and is in a disc shape in the radial direction. These two kinds of deformation will result in the uneven surface of the rock, the waste of stone, the loud noise and vibration of the sawing, resulting in the early damage of the diamond and the reduced life of the saw blade.
Temperature effect: the traditional theory holds that the influence of temperature on the sawblade process is mainly reflected in two aspects: first, the diamond graphitization in the block; The second is to cause the thermal stress of the diamond and the body and lead to the premature loss of diamond particles. New research shows that the heat generated during the cutting process is mainly afferent. Arc temperature is not high, generally between 40 ~ 120 ℃. And the abrasive grinding temperature is higher, generally between 250 ~ 700 ℃. The cooling liquid only reduces the average temperature of the arc zone, but has little effect on the abrasive temperature. That not make the graphite carbonization temperature, however, can make the friction between abrasive grain and workpiece properties change, and thermal stress occurred between diamond and additives, and to cause a fundamental change of the failure mechanism of diamond. The study shows that the temperature effect is the most important factor that causes the blade breakage.
Abrasion: due to the force effect and temperature, the use of the saw blade for a period of time tends to produce wear and tear. There are several types of abrasion: abrasive wear, local crushing, large area crushing, falling off, and mechanical abrasion along the cutting speed. Abrasive wear: constant friction between diamond particles and components, the edge passivating into a plane, losing cutting performance and increasing friction. Cutting heat can make the diamond particle surface graphitization thin layer, the hardness is greatly reduced, increase the wear: diamond particles surface under alternating thermal stress, as well as cutting under alternating stress, fatigue cracks will occur and local breakage and show new sharp edge, is the ideal wear form; Large area crushing: the diamond particles bear the impact load when cutting into the cutting, and the prominent grains and grains are consumed prematurely. Shedding: the alternating cutting force causes the diamond particles to be shaken continuously in the binder. At the same time, the wear and sawing heat of the combined agent in the sawing process soften the binding agent. This reduces the control power of the binder, and when the cutting force on the particle is greater than the control force, the diamond particles will fall off. Any kind of wear is closely related to the load and temperature of the diamond particles. Both depend on sawing and cooling conditions.