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News

Diamond Saw Technology - other factors

  • Author:Chois Dong
  • Source:boreway.net
  • Release on:2017-09-16
Diamond size
Conventional diamond particle size in the range of 30/35 ~ 60/80. The more hard rock, should be chosen with finer granularity. Because under the same pressure conditions, the more detailed the more sharp diamond, cut in favor of hard rock. In addition, the general saw blade sawing large diameter require high efficiency, should be chosen with coarse granularity, such as 30 / 40,40 / 50; lower small-diameter blade cutting efficiency, cutting cross-section requires smooth rock, should selection of finer particle size, such as 50/60, 60/80.
Segment concentration
The so-called diamond concentration refers to the density of diamond distribution in the working layer of the carcass (ie contained within the diamond weight per unit area). "Norms" provides work every cubic centimeter carcass containing 4.4 karats of diamonds, at a concentration of 100%, including 3.3 karats of diamonds, at a concentration of 75%. Volume concentration of diamond indicates how many lumps of share volume, and provides that when the concentration of 1/4 of the volume of the total volume of diamond is 100%. Increases the concentration of diamond saw blades are expected to extend the life, because of the increased concentration that is reduced by an average of each piece of diamond cutting force suffered. But it will increase the cost of increasing the depth of the blade so that there is a concentration of the most economical, and the concentration increases with shear rate increases Cheng.
Segment hardness binding agent
In general, the higher the hardness binding agent, its wear resistance is stronger. Thus, when a large rock cutting abrasive, binder hardness should be high; when cutting soft rock material, the hardness of the binding agent should be low; when cutting abrasive large and hard rock, the binding agent should moderate hardness ʱ??
Force effect, temperature effect and wear damage
Diamond saw blades in cutting stone in the process, it will be subject to alternating load of centrifugal force, cutting force, cutting heat and so on.
And temperature effects due to the force caused by diamond saw blade worn donate loss.
Force effect: during sawing, the blade is subject to axial force and tangential force. Due to the presence of the force in the circumferential direction and radially acting, in the axial direction so that the blade wavy, dish-shaped in the radial direction. Both will result in deformation of the rock section is not flat, stone waste more time sawing noise, vibration intensified, resulting in early breakage diamond agglomeration, reduce blade life.
Temperature effects: the traditional theory: the effect of temperature on the blade process mainly manifested in two aspects: First, cause agglomeration of diamond graphitization; the second is caused by hot carcass Wilson force diamond and the diamond particles resulting from premature loss ʱ?? New research shows that: the heat generated during the cutting main incoming caking. Arc temperature is not high, generally between 40 ~ 120 ℃. The abrasive grinding point has high temperature, generally between 250 ~ 700 ℃. While only reducing the average temperature of the coolant arc zone, the temperature has little effect on the grain. Such temperatures do not cause charring graphite, but make friction between the abrasive properties and the workpiece changes, and thermal stresses between the diamond and additives, which led to a fundamental failure mechanisms diamond bend of. Research shows that the temperature effect is to make the maximum impact factor blade breakage.
Grinding damage: due to the force effect and temperature than should, after a period of use the blade tends to produce mill damaged. Grinding damaged mainly the following forms: abrasive wear, local crushing, a large area broken off, binders direction along the cutting speed mechanical abrasion. Abrasive: the diamond particles and the type member constant friction, edge passivation into a flat, losing cutting, increasing friction. Sawing heat causes the surface of the diamond particles graphitized thin, the hardness greatly reduced, increased wear: diamond particle surface subjected to alternating thermal stresses, and also subjected to an alternating stress of cutting, the fatigue crack occurs locally broken, revealing a sharp new edge, is an ideal wear patterns; a large area broken: to withstand impact loads when the diamond particles in the Leads, the more prominent of grains and grain consumed prematurely; off: alternating diamond cutting force binding agent particles are constantly being generated by shaking loose. At the same time, wear and thermal cutting process of cutting binding agent itself causes the binding agent to soften. This makes the binder holding force decline, when the cutting force is greater than the holding force on the particles, the diamond particles will fall off. No matter what kind of wear and tear are closely related to the diamond particles bear the load and temperature. Both of which depend on the process and Cheng cut cooling and lubrication conditions.