초록 ▼

A method of controlling the spacing between a material forming punch and a complemental die includes advancing a punch shell and a pressure sleeve into engagement with the material and holding the material with the sleeve and blanking it with the punch shell. The material is then preliminarily forme

A method of controlling the spacing between a material forming punch and a complemental die includes advancing a punch shell and a pressure sleeve into engagement with the material and holding the material with the sleeve and blanking it with the punch shell. The material is then preliminarily formed by clamping the periphery between the pressure sleeve and a die core ring and advancing a punch core past the top of the die core ring and clamping the material against a die core to establish the desired dimension. The material is then finally formed by further advancement of the punch core with the die core and die core ring moving together. The apparatus includes a die core and die core ring which are concentrically arranged and independently supported but movable into engagement with each other after a predetermined amount of travel so as to move together through any further travel caused by movement of a punch core against the die core.

대표청구항 ▼

A method of controlling the spacing between a material forming punch carried by a movable slide and a forming die carried by a fixed base in a double acting press, comprising the steps of: (a) advancing a punch shell and a pressure sleeve into engagement with the material; (b) holding the material w

A method of controlling the spacing between a material forming punch carried by a movable slide and a forming die carried by a fixed base in a double acting press, comprising the steps of: (a) advancing a punch shell and a pressure sleeve into engagement with the material; (b) holding the material with the pressure sleeve against an opposed die core ring and blanking it by advancing the punch shell; (c) preliminarily forming the material and establishing a predetermined dimension by engaging a peripheral area of the material between the pressure sleeve and the top of the die core ring and advancing a punch core past the top of the die core ring so as to engage a central area of the material and clamp the same against a die cover; and (d) engaging the normally independently movable and supported die core ring and the die core at the end of step (c) so that further advancement of the punch core will cause the die core and the die core ring to move together while maintaining their relationship with each other.