How to improve the life of diamond saw blades?
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Author: Publish Time:2017-10-16 16:02:13 Origin:
Roma Diamond Tools
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How to improve the life of diamond saw blades?
Diamond saw blade is an indispensable tool for stone cutting and processing. The factors that determine its efficiency and life are multifaceted. In general, the following parameters are mainly included.
1st, Cutting Parameters
(1) Cutting line speed: In actual work, the linear speed of the diamond saw blade is limited by the conditions of the equipment, the quality of the saw blade and the nature of the saw blade. From the best saw blade life and sawing efficiency, the speed of the saw blade should be selected according to the nature of the different stone. Cutting granite, the line speed can be selected in the range of 25m ~ 35m / s. For the quartz content is high and difficult to cut the granite, saw blade line speed limit is appropriate. In the production of granite brick, the use of diamond saw blade diameter is smaller, line speed can reach 35m / s.
(2) Cutting depth: Cutting depth is involved in diamond wear, effective cutting, saw blade force and saw the nature of the important parameters of stone. In general, when the diamond saw blade line speed is high, should choose a small cut depth, from the current technology, the depth of the cutting diamond can be selected between 1mm ~ 10mm. Usually with large diameter saw blade saw the granite block, the cutting depth can be controlled between 1mm ~ 2mm, at the same time should reduce the feed speed. When the linear speed of the diamond saw blade is large, a large cutting depth should be selected. However, when the cutting performance and tool strength within the scope of permission, should try to take a larger cutting concentration for cutting to improve the cutting efficiency. When required for machined surfaces, small depth cutting should be used.
(3) Feeding speed: Feeding speed is the feed rate of cutting stone. Its size affects the sawing rate, saw blade force, and the heat dissipation of the cutting area. Its value should be selected according to the nature of the stone. In general, cutting soft stone, such as marble, may be appropriate to improve the feed speed, if the feed speed is too low, more conducive to improve the cutting rate. Cutting fine grain structure, relatively homogeneous granite, may be appropriate to improve the feed speed, if the feed speed is too low, the diamond blade is easy to be polished. However, cutting the coarse grain structure and soft and hard granite, should reduce the feed speed, otherwise it will cause the blade vibration led to diamond fragmentation and reduce the cutting rate. Cutting granite feed rate is generally selected in the range of 9m ~ 12m / min.
2nd, other factors
(1) Diamond particle size: commonly used diamond particle size in the range of 30/35 ~ 60/80. The harder the rock, it is desirable to use a finer particle size. Because under the same pressure conditions, the more sharp and more sharp diamond, is conducive to cut into the hard rock. In addition, the general large diameter saw blade requires high cutting efficiency, should be selected with coarse particle size, such as 30 / 40,40 / 50; small diameter saw blade sawing low efficiency, requiring rock sawing section smooth Choose a smaller particle size, such as 50 / 60,60 / 80.
(2) the tip of the concentration: the so-called diamond concentration, refers to the diamond in the working layer of the distribution of the density of the carcass (that is, the weight per unit area of the diamond). "Specification" provides that the per cubic centimeter of work in the carcass containing 4.4 carats of diamonds, the concentration of 100%, containing 3.3 karats of diamonds, the concentration of 75%. The volume concentration represents the volume of the diamond in the agglomerate, and provides that the concentration of the diamond is 100% of the total volume of 1/4. Increasing the diamond concentration is expected to extend the life of the saw blade because increasing the concentration reduces the average cutting force per diamond. But increasing the depth will inevitably increase the cost of the saw blade, and thus there is a most economical concentration, and the concentration increases with the cut rate increases.
(3) hardness of the tip of the binder: In general, the higher the hardness of the binder, the stronger the wear resistance. Therefore, when the sawing of large rock grinding, the hardness of the binder should be high; when the sawing of soft rock, the hardness of the binder should be low; when cutting rough and hard rock, the hardness of the binder should be moderate The
(4) force effect, temperature effect and wear damage: diamond saw blade in the process of cutting stone, will be centrifugal force, sawing force, sawing heat and other alternating load role.
*Due to the effect of force and temperature effects caused by the diamond saw blade wear and tear damage.
Force Effect: During sawing, the saw blade is subjected to axial forces and tangential forces. Due to the presence of forces in the circumferential and radial directions, the saw blades are wavy in the axial direction and in the radial direction. These two kinds of deformation will cause the rock surface is not straight, stone waste, sawing noise, vibration intensified, resulting in early damage to the diamond agglomeration, saw blade life reduced. Stone Research Society (micro-signal stone5A)
Temperature effect: the traditional theory that: the impact of temperature on the blade process is mainly manifested in two aspects: First, lead to agglomeration in the diamond graphitization; the second is caused by diamond and carcass of the heat force and lead to premature loss of diamond particles The New research shows that the heat generated during the cutting process is mainly introduced into the agglomeration. Arc area temperature is not high, generally between 40 ~ 120 ℃. While the abrasive grinding point temperature is higher, generally between 250 ~ 700 ℃. While the coolant only reduces the average temperature of the arc area, but has little effect on the abrasive grain temperature. This temperature does not cause the carbonization of graphite, but it will make abrasive and workpiece friction between the performance changes, and the diamond and additives between the thermal stress, resulting in the diamond failure mechanism of a fundamental bending. Studies have shown that the temperature effect is the biggest factor affecting the breakage of the saw blade.
Grinding damage: due to the effect of force and temperature should be more than a period of time after the use of the blade will often produce grinding damage. The main form of wear and tear is the following: abrasive wear, local crushing, large area crushing, shedding, bonding agent along the sawing speed of mechanical abrasion. Abrasive wear: diamond particles and pieces of continuous friction, edge passivation into a flat, loss of cutting performance, increase friction. Sawing heat will cause the diamond particles on the surface of the graphitized thin layer, greatly reduce the hardness, exacerbate wear: diamond particles to withstand the alternating thermal stress, but also bear the alternating cutting stress, there will be fatigue cracks and local broken, revealed The sharpness of the new edge, is the ideal wear pattern; large area broken: diamond particles cut in the cut to bear the impact load, the more prominent particles and grains prematurely consumed; off: the cutting force of the diamond The particles are constantly shaking in the binder and are loosened. At the same time, the abrasion and sawing of the binder itself during the sawing process soften the binder. This reduces the gripping force of the binder, and when the cutting force on the particles is greater than the holding force, the diamond particles will fall off. Whichever wear is closely related to the load and temperature of the diamond particles. Both of which depend on the cutting process and the cooling lubrication conditions.
