PLUG USED IN PIERCING MACHINE AND PLUG REGENERATION METHOD

摘要

The objective of the present invention is to provide a plug which is used in a piercing machine that pierce-rolls a billet, and for which the number of uses of said plug can be improved, and to provide a method for regenerating a plug. This plug (10) is used in a piercing machine (30) that pierce-rolls a billet (36). The plug (10) is equipped with a main body part (18), a cylindrical part (20), and a sprayed coating (16). The maximum diameter of the main body part (18) is at the rear end. The cylindrical part (20) has the same diameter as the rear end of the main body part (18), and extends from the rear end of the main body part (18). The sprayed coating (16) is formed on the surfaces of the main body part (18) and the cylindrical part (20).