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Polishing machine working principle
Dec 18, 2017

The best way to solve this conflict is to divide the polishing into two stages. The purpose of the rough polishing is to remove the polished damage layer, which should have the largest polishing rate at this stage. The surface damage caused by the rough polishing is a secondary consideration, but it should also be as small as possible. The second is the fine polishing (or final polishing) Its purpose is to remove surface damage caused by rough throwing, to minimize polishing damage. Polishing machine polishing, the polished surface of the specimen and the polishing plate should be absolutely parallel and gently pressed on the polishing disc, pay attention to prevent the sample from flying out and because the pressure is too large and produce a new wear marks. At the same time, the sample should be rotated and moved back and forth along the radius of the turntable to avoid the local abrasion of the polishing fabric too fast. During the polishing process, the suspension of the fine powder should be continuously added to keep the polishing fabric at a certain humidity. If the humidity is too high, the abrasion mark will be weakened and the hard phase in the sample will appear embossed and the non-metallic inclusions in the steel and the graphite phase in the cast iron will produce a "trailing tail" phenomenon. When the humidity is too small, the sample Heating, reducing the role of lubrication, grinding lose luster, and even dark spots, light alloy will be the surface of the wound. In order to achieve the purpose of rough throwing, the turntable is required to rotate at a lower speed, preferably not exceeding 600r / min; the polishing time should be longer than the time required to remove scratches because the deforming layer is also removed. Rough polished surface after polishing, but bleak, observed under a microscope uniform and detailed wear marks, to be refined polishing to be eliminated.

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