The most important thing for the operation of the Wheel Polishing Machine is to get the maximum polishing rate so that it can quickly remove a damaged layer from the polishing. At the same time, polishing the damaged layer does not affect the final observed structure. The front is required to use a relatively coarse abrasive to ensure a large polishing rate to remove the damaged layer when polishing, but the polished damage layer is also deep, but for the latter It is required to use a relatively fine material, and then the polishing damage layer has a lower polishing rate.
However, for this contradiction, we should better solve it in two stages. For rough polishing, it is mainly to remove the polished damage layer. For this stage, it should have the maximum polishing rate. However, the surface damage caused by rough polishing is a secondary consideration, but it should be as small as possible. Secondly, fine polishing Or the purpose of throwing it at the end is to remove the surface damage caused by the rough polishing and then minimize the polishing damage. When the polisher is polished, the sample grinding surface and the polishing disc should be absolutely parallel and evenly pressed against the polishing disc.
Also pay attention to prevent the sample from flying or creating a new wear scar 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 fine powder suspension should be continuously added to keep the polishing fabric at a certain humidity. Too much humidity will weaken the wear scar, so that 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 "tailing" phenomenon; if the humidity is too small, the sample will be generated due to frictional heat generation. The temperature rises, the lubrication is reduced, the surface is tarnished, and even dark spots appear, and the light alloy will throw the surface. In order to achieve the purpose of rough throwing, the rotating speed of the turntable is required to be low, preferably not exceeding 600r/min; the polishing time should be longer than the time required to remove the scratches, because the deformed layer is also removed. After rough polishing, the surface is smooth, but it is dull and dull. Under the microscope, there is a uniform and fine wear scar, which needs to be removed by fine polishing.
The speed of the turntable can be appropriately increased during fine polishing, and the polishing time is preferably to throw away the damage layer of the rough throw. After fine polishing, the polished surface is as bright as a mirror. No scratches can be seen under the bright field conditions of the microscope, but the wear marks are still visible under phase contrast lighting conditions. The polishing quality of the polishing machine seriously affects the structure of the sample, which has gradually attracted the attention of relevant experts. At home and abroad, a lot of research work has been done on the performance of the polishing machine. Many new models and a new generation of polishing equipment have been developed, which have been developed into various semi-automatic and fully automatic polishing machines from the original manual operation.
information about wheel polishing machine : https://www.zhongyun-machine.com/product/wheel-polishing-machine/
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