Brief introduction of scraping and grinding

Scraping is a finishing process that uses scraper, datum plane, measuring tool and display agent to measure and scrape the workpiece manually, so that the workpiece can meet the requirements of size, geometry, surface roughness and compactness specified in the process. Because the tools used are simple and universal, with small machining allowance and high precision, they are widely used in machine tool manufacturing and mechanical equipment repair. Usually, the guide rail, carriage and bushing of sliding bearing of machine tool are finished by scraping and grinding.

Manual scraping is one of the methods of plane repair. Its purpose is to reduce the surface roughness value and improve the contact accuracy and geometric accuracy, so as to improve the matching stiffness, lubrication performance, mechanical benefit, service life and flatness of machine tools. If only surface grinder and guideway grinder are used for machining, it is difficult to achieve the best effect. Manual scraping and grinding is a necessary processing technology for high-grade machine tools, cast iron plates and precision measuring tools.