METHOD AND SYSTEM FOR METAL DRAWING AND REDRAWING

摘要

A system and method of forming a drawn cup for production of a metal container is provided. The system and method contemplates the provision of gap pins to control the relative movements of cup forming features and provide for reduced risk of damage including pinching, chatter, slivering, and thinning of portions of the cup.

主权项

1. A method of forming a drawn metallic cup having a sidewall, and a dome comprising:
providing a sheet of stock metal material; forming a plurality of through holes in the sheet, the through holes provided for receiving gap pins of a forming tool; providing a forming tool, the forming tool comprising:
i. a draw die;ii. a draw pad;iii. a blank and draw die;iv. a center punch; andv. a plurality of gap pins; providing said gap pins through said through holes such that distal ends of said gap pins are provided proximal a flange portion of said draw pad; wherein the stock material to be formed is provided between said draw pad and said blank and draw die; sheering the sheet to form a generally circular blank; forming the generally circular blank into a first shape by moving the draw die in a first direction, wherein a portion of the generally circular blank conforms to the draw die under pressure, and wherein the generally circular blank is transitioned out of a space between the draw pad and the blank and draw die; contacting said flange portion of said draw pad with the distal ends of the gap pins; contacting an upper surface of the stock material with the center punch travelling in a second direction which is substantially an opposite direction as the first direction to form the blank in a second shape.