The polishing machine is a power tool, and the polishing machine consists of basic elements such as a base, a throwing disc, a polishing fabric, a polishing cover and a cover. The motor is fixed on the base, and the taper sleeve for fixing the polishing disc is connected with the motor shaft through screws. The polishing fabric is fastened on the polishing disc through the ferrule. After the motor is powered on through the switch on the base, the sample can be polished on the rotating polishing disc by applying pressure to the sample by hand. The polishing liquid added in the polishing process can flow into the square plate placed next to the polishing machine through the drain pipe in the plastic plate fixed on the base. The polishing cover and cover can prevent dirt and other debris from falling on the polishing fabric when the machine is not in use and affecting the use effect.

working principle
The key to the operation of the polishing machine is to try to get the maximum polishing rate so as to remove the damage layer produced during polishing as soon as possible. At the same time, the polishing damage layer should not affect the final observed tissue, that is, it will not cause false tissue. The former requires the use of coarser abrasives to ensure a larger polishing rate to remove the polished damage layer, but the polishing damage layer is also deeper; the latter requires the use of the finest materials to make the polishing damage layer shallower, but polishing rate is low.

The best way to solve this contradiction is to divide the polishing into two stages. The purpose of rough polishing is to remove the polishing damage layer. This stage should have the maximum polishing rate. The surface damage formed by rough polishing is a secondary consideration, but it should also be as small as possible; by fine polishing (or final polishing), Its purpose is to remove the surface damage caused by rough polishing and minimize polishing damage. When polishing by the polishing machine, the grinding surface of the sample and the polishing disc should be absolutely parallel and lightly pressed on the polishing disc evenly. Pay attention to prevent the sample from flying out and new grinding marks due to too much pressure. At the same time, the sample should be rotated and moved back and forth along the radius of the turntable to avoid local wear of the polishing fabric too fast. During the polishing process, the micro-powder suspension should be continuously added to keep the polishing fabric in a certain humidity. If the humidity is too high, the wear scar effect of polishing will be weakened, and the hard phase in the sample will be embossed, and the non-metallic inclusions in the steel and the graphite phase in the cast iron will cause a "tail" phenomenon; if the humidity is too small, the friction heat will cause the sample to be When the temperature rises, the lubrication effect is reduced, the grinding surface loses its luster, and even black spots appear, and the light alloy will scratch the surface. In order to achieve the purpose of rough polishing, the rotating speed of the turntable is required to be low, preferably not more than 600r/min; the polishing time should be longer than the time required to remove the scratches, because the deformation layer is also removed. After rough polishing, the grinding surface is smooth, but dull, and there are even and fine wear marks observed under the microscope, which need to be eliminated by fine polishing.

During fine polishing, the speed of the turntable can be appropriately increased, and the polishing time is appropriate to discard the damaged layer of rough polishing. After fine polishing, the polished surface is as bright as a mirror, and no scratches can be seen in the bright field of the microscope, but the scratches can still be seen under the condition of phase contrast illumination. The polishing quality of the polishing machine seriously affects the structure of the sample, which has gradually attracted the attention of relevant experts. A lot of research work has been done on the performance of polishing machines at home and abroad, and many new models and new generations of polishing equipment have been developed, which are developing from the original manual operation to various semi-automatic and fully automatic polishing machines.
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