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Metallographic Grinding and Polishing Machine Manufacturer: A Brief Introduction to Metallographic Grinding and Polishing Machines
Release Date:
2021-01-19
Metallographic Grinding and Polishing Machine The purpose of polishing is to remove the fine abrasive marks left on the polished surface of metallographic specimens by fine grinding, thereby producing a smooth, flawless mirror finish. Although polishing is the final step in metallographic sample preparation and results in a smooth mirror surface, experienced metallographers emphasize that extra care must be taken during polishing, because the polishing process can only eliminate the very thin surface layer and any residual metal; thus, the quality of polishing is largely dependent on the quality of the preceding steps. In some cases, deep abrasion marks may remain on the ground surface prior to polishing, and even prolonged polishing may fail to remove them, necessitating a second polishing pass.
Metallographic Grinding and Polishing Machine Principle of mechanical polishing: Mechanical polishing results from the relative interaction between the polishing powder and the surface of the metallographic specimen. Polishing powders are finer than polishing abrasives. It is generally believed that, during the polishing process, the polishing agent exerts two types of action on the specimen surface.
Metallographic Grinding and Polishing Machine Abrasive action: Polishing particles are embedded in the pores of the polishing cloth to achieve temporary adhesion, functioning similarly to abrasive sandpaper; however, the cutting and scratching inflicted on the sample surface are significantly more severe than with polishing.
Metallographic Grinding and Polishing Machine Rolling action: Polishing particles readily detach from the polishing cloth and may even be ejected from the polishing disc. During polishing, these detached particles become entrapped between the polishing cloth and the abrasive surface of the specimen, where they undergo mechanical rolling motion, causing protrusions on the metal surface to migrate into recessed areas. In addition, the mechanical friction between the polishing cloth and the abrasive surface also facilitates “metal flow.”
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