How does the metallographic polishing machine remove the polished damage layer?- Trojan (Suzhou) material technology Co., Ltd.

How does the metallographic polishing machine remove the polished damage layer?

07-01-2022

The key to the operation of the metallographic polishing machine is to try to remove the damaged layer produced during polishing as soon as possible. We can require the use of coarser abrasives to ensure a greater polishing rate to remove the polished damage layer, but the polishing damage layer is also deeper; we can also require the use of finer materials to make the polishing damage layer shallower, but The polishing rate is low.

When polishing with a metallographic polishing machine, the grinding surface of the sample and the polishing disk should be absolutely parallel and lightly pressed on the polishing disk evenly. Take care to prevent the sample from flying out and creating new wear marks due to excessive pressure. At the same time, the sample should be rotated and moved back and forth along the radius of the turntable to avoid local abrasion of the polishing fabric too fast. During the polishing process, the micro-powder suspension should be continuously added to keep the polishing fabric at a certain humidity.

What are the effects of humidity on the quality of polishing?
Too much humidity will weaken the effect of polished wear marks, causing the hard phase of the sample to appear embossed and non-metallic inclusions in steel and graphite phase in cast iron to produce "tailing"; when humidity is too low, friction and heat will cause the sample 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 damage the surface. The purpose of rough polishing is to remove the polished damage layer. This stage should have a larger polishing rate. The surface damage formed by rough polishing is a secondary consideration, but it should also be as small as possible; the second is fine polishing, which aims to remove rough The surface damage caused by polishing reduces the polishing damage to a very small extent.

The latest use method of metallographic polishing machine:
1. First, turn on the power to make the machine enter the standby state
2. Then turn on the switch to make the disc rotate. If the disc rotates normally and there is no abnormal noise, it can be polished.
3. After use, turn off the switch and turn off the power supply on the right side.