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In the 1950s and 1960s, the car, milling, drilling, boring and planing masters of the machinery factory constantly improved the geometry and angle of the tool with the attitude of the owner to improve the production efficiency and tool life. At that time, the main application tool was welded. Carbide inserts or integral high-speed steel cutters, which have led to a large number of famous knives and cutting experts. They often form a promotion team to demonstrate the passing of treasures, and often organize technical exchanges on holidays. Many teachers and technicians have difficulties in their own processing.