Method for producing micro-bores in metal work-piece involves forming hardened points on plate which is used as punch for sheet metal work-piece placed in die

摘要

The method of forming a micro-bore uses bit formed from a plate (8) with pints formed at zero, thirty and fifty millimetres to form a laminated punch. The plate is mounted on a support (11) for fitting on the head of a press (15) to form multiple micro-bores in a plate placed in an open die (9) which is closed by the points penetrating the metal sheet work-piece (10). DETAILED DEWCRIPTION - claims include a punch for carrying out the method