The Correct Use Of The Polishing Machine

The correct use of the polishing machine:

The key to the operation:

Try to get the maximum polishing rate so that the damaged layer will be removed as soon as possible. At the same time, polishing damage layer will not affect the final observed tissue, that is, no false tissue will be created. The former requires the use of coarser abrasives to ensure a larger polishing rate to remove the abrasive damage layer, but the polishing damage layer is also deep; the latter requires the use of the finest material to make the polishing damage layer relatively shallow, but the polishing rate is low. The best way to solve this contradiction is to divide the polishing into two stages. The purpose of coarse throwing is to remove the polishing damage layer. This stage should have the maximum polishing rate. The surface damage formed by the rough casting is a minor consideration, but it should be as small as possible; the second is the fine throwing (or final throw), which aims to remove the surface damage caused by the rough throwing and minimize the polishing damage.


When the polishing machine is polished, the surface of the specimen and the discs should be absolutely parallel and evenly pressed on the discs, to prevent the specimen from flying out and producing new grinding marks due to too much pressure. At the same time, the specimen should be rotate and move back and forth along the radius direction of the disc in order to avoid the rapid local wear of the polished fabric in the process of polishing. The humidity is too much to weaken the polished grinding mark, making the hard phase in the sample floating convex, nonmetallic inclusions in steel and the "drag tail" of graphite phase in cast iron. The humidity is too low, the friction heat will cause the sample to rise, the lubrication effect decreases, the grinding surface loses luster, even the black spot, the light alloy will throw the surface. . In order to reach the goal of rough throwing, the rotating speed is low, and it is best not to exceed 500r/min; the polishing time should be longer than the time needed to remove the scratch, because the deformation layer should be removed. After polishing, the grinding surface is smooth but dull. Under the microscope, there are uniform and detailed grinding marks, which need to be eliminated by polishing. The speed of the turntable can be increased properly when polishing is finished, and the polishing time should be used to throw away the damaged layer. After polishing, the grinding surface is as bright as a mirror. No scratches can be observed under the microscope's field of view, but wear marks can still be observed under the condition of phase contrast illumination.


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