Special machining refers to new machining methods other than cutting, also known as non-traditional machining methods. Different from traditional machining methods, special machining does not require tools that are harder than workpieces, and does not require significant mechanical force during processing. Instead, it directly uses mechanical energy such as electrical energy, chemical energy, acoustic energy, and light energy. In addition to the other energy to remove the excess part of the workpiece in order to achieve a certain shape, size and surface roughness requirements. There are many special processing methods. The main methods used for mold processing are: EDM forming, WEDM, electrolytic machining, electrolytic polishing, electrolytic grinding, electroforming, ultrasonic machining, and laser processing.
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