In order to achieve high efficiency, high precision and continuous reduction of processing costs, machining has developed rapidly in the past 20 years. The speed of the machine tool and the cutting depth of the tool are continuously improved. The tool material is developed from carbon steel and high-speed steel to cemented carbide and ceramic materials. The workpiece is improved to high-strength, high-toughness and difficult-to-machine materials, which increases the difficulty of cutting. In addition, due to high-speed grinding, slow-feeding for strong grinding, precision grinding,
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