When punching holes with a concave die, the standard of hole diameter is based on the diameter of the convex die. For example, if the hole diameter is ф10mm, the diameter of the punching die is 10mm, and the die clearance is adjusted by the size change of the punching die. 2. The selection of the punching die When punching different materials with the punching die, the different materials of the punching die will affect the selection of the die clearance. In order to ensure the quality of the hole section, dimensional accuracy, and to improve the service life of the punching die and the die, the die clearance is usually selected in consideration of the deviation in the production of the die and the wear and tear in use, and usually, only an appropriate range can be selected as a reasonable clearance.

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