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Metallographic Grinding and Polishing Machine Manufacturer: Key Steps for Fine Polishing with a Metallographic Grinding and Polishing Machine
Release Date:
2021-04-06
Metallographic Grinding and Polishing Machine The core principle of the operation is to achieve the highest possible polishing rate, so that a single polishing pass during the machining process can rapidly eliminate damage. At the same time, the polished layer must not obscure the damage morphology revealed in the final inspection, nor should it introduce spurious features. These two requirements are inherently contradictory: the former calls for coarse grinding to ensure rapid removal of the damaged layer through reciprocating motion and to penetrate deeper into the damaged zone, whereas the latter demands the use of the finest polishing materials to produce a shallower damaged layer at a lower material-removal rate. The optimal approach is to implement the process in two stages—thus reconciling these conflicting objectives.
The metallographic polishing machine should ensure that the polished damage layer does not interfere with the final microstructural observation, i.e., it should not produce artificial microstructures. The former requires the use of coarser abrasives to achieve a higher polishing rate and thereby remove the polished damage layer; however, this also results in a deeper damage layer. The latter calls for the use of the highest-quality polishing materials, which yields a shallower damage layer but at a lower polishing rate. The optimal solution to this trade-off is to divide the polishing process into two stages: rough polishing, whose purpose is to eliminate the polished damage layer, should be carried out at the highest possible polishing rate while minimizing surface damage caused by the rough polishing; and fine polishing (or final polishing), whose goal is to remove any surface damage introduced during rough polishing and to minimize the remaining polished damage.
First is coarse polishing, the purpose of which is to remove the polishing-induced damage layer; this stage should achieve the highest polishing rate. The second step is to introduce damage onto the rough polished surface—ideally, only minimal damage should be introduced. Finally comes fine grinding (or final grinding), whose objective is to eliminate the surface damage incurred during coarse grinding and to minimize any remaining grinding-induced damage. During polishing, the ground and polished specimen must be held absolutely parallel and evenly pressed against the polishing cloth; excessive pressure can lead to the formation of new abrasion marks, so careful sample preparation and fly reproduction are essential.
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