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    Factors affecting the sharpness of diamond saw blades

    > From:TianYi Browse:- Release date:2016/7/16【

    The commonly used diamond size in 30/35 ~ 60/80 range. The harder the rock is, the finer grain size should be used. Because under the same pressure conditions, the diamond is more and more sharp, is conducive to cut into the hard rock. In addition, the general requirements of large diameter blade sawing efficiency is high, should be selected with coarse granularity, such as 30/40, 40/50; the efficiency of small diameter saw blades sawing low requirements ishisaw smooth section, should be selected with fine granularity, such as 50/60, 60/80.
    Cutter head concentration
    The so-called diamond concentration refers to the density distribution in the working layer of diamond matrix (i.e. the unit area contained within the diamond weight). "Standard" provisions, including the 4.4 carat diamond per cubic centimeter work matrix, the concentration of 100%, containing 3.3 carat diamond when its concentration was 75%. The volume concentration indicates the amount of diamond in the agglomeration, and the concentration of 1/4 is 100% when the volume of the diamond is occupied. Increasing the diamond concentration is expected to extend the life of the saw blade, because the average cutting force is reduced by increasing the concentration. But increasing the concentration will inevitably increase the cost of the saw blade, so there is one of the most economical concentration, and the concentration increases with the increase of the sawing rate.
    Cutter head hardness
    In general, the hardness of bond is higher, and its ability to resist wear is stronger. Therefore, when the saw cutting abrasive rock, bond hardness should be high; when cutting material soft rock, bond hardness should be low; when the grinding of large and hard rock, bond hardness should be moderate.
    In the process of diamond sawblade stone cutting, sawing, sawing will heat alternating load by centrifugal force, the role of.
    As a result of the force effect and temperature effect caused by the wear of diamond saw blade.
    Force effect: in the process of sawing, the saw blade is subjected to axial force and tangential force. Due to the action of the force in the circumferential direction and the radial direction, the saw blade is wave shaped in the axial direction and is in the radial direction. These two kinds of deformation can cause the plane of the rock is not straight, the stone waste is much, the noise is big, the vibration is intensified, the early damage of diamond agglomeration, and the life of the saw blade is reduced.
    Temperature effect: the traditional theory that: the effect of temperature on the saw blade process mainly in two aspects: one is the result of graphitization of diamond caking in; the two is caused by diamond and matrix thermal stress and lead to premature loss of diamond particles. The new research shows that the heat generated during the cutting process is mainly incoming. Arc temperature is not high, generally between 40 to 120 degrees C. The grinding point temperature is higher, generally between 250 to 700 degrees celsius. The coolant only reduces the average temperature of the arc region, but has little effect on the grinding grain temperature. This temperature does not cause the carbonization of graphite, it will make the friction performance change between abrasive particle and workpiece, and the thermal stress between diamond and additives, and lead to fundamental changes in the failure mechanism of diamond. The research shows that the temperature effect is the biggest influencing factor of the saw blade breakage.
    Grinding damage: due to the effect of stress and temperature, the saw blade after a period of use often produce wear and damage. In the form of wear and tear, there are the following: abrasive wear, local crushing, large area of broken, fall off, bond along the cutting speed of the direction of mechanical abrasion. Abrasive wear: diamond particles and the friction, edge passivation into the plane, the loss of cutting performance, increase friction. Cutting heat will make the diamond particles appear on the surface of the graphite layer, the hardness is greatly reduced, increasing the wear diamond particle surface under alternating thermal stress, while also cutting under alternating stress, the fatigue crack will appear partially broken, showing a new edge sharp edge, is the ideal form of wear; large area crushing impact load cutting of diamond particles in the breakthrough, the more prominent the grains and grain soon consumed; off the cutting force of alternating diamond particles in a binder are constantly shaking loose. At the same time, the cutting process of the bond in the process of wear and saw cutting heat to soften the bond. This makes the holding force of the bond decreased, when the particle on the cutting force is greater than the control force, the diamond particles will fall off. No matter what kind of wear and diamond particles are closely related to the load and temperature. Both of them depend on sawing process and cooling lubrication conditions.

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