초록 ▼

A method and apparatus for forming tapered metal container bodies from relatively hard material having a Rockwell hardness within the range of 73 and 79. A disc-shaped blank is formed into a cup having an integral bottom wall and cylindrical sidewall, wherein the sidewall has an axial height general

A method and apparatus for forming tapered metal container bodies from relatively hard material having a Rockwell hardness within the range of 73 and 79. A disc-shaped blank is formed into a cup having an integral bottom wall and cylindrical sidewall, wherein the sidewall has an axial height generally equal to one-half the axial height of the desired final container body without thinning the metal. The cup is then redrawn at a first redraw station to form a first stage container body having the desired axial height and bottom wall diameter with the sidewall being cylindrical or having a very slight taper. This first stage container body is then redrawn at a second redraw station to impart a taper of between 2.degree. and 4.degree. to the sidewall without affecting the axial height of the sidewall or the metal thickness thereof. The apparatus includes a draw station and at least two redrawn stations and may include a die for profiling the bottom wall of the final container body.

대표청구항 ▼

[ I claim:] [1.] A method of forming a tapered container body from a metal blank, wherein said container body has a tapered sidewall with a predetermined axial height and an integral bottom wall, including the steps of:A) forming the blank into a cup having a substantially cylindrical sidewall and a

[ I claim:] [1.] A method of forming a tapered container body from a metal blank, wherein said container body has a tapered sidewall with a predetermined axial height and an integral bottom wall, including the steps of:A) forming the blank into a cup having a substantially cylindrical sidewall and an integral bottom wall with said sidewall having an axial height less than the predetermined axial height of the container body;B) redrawing the cup into a first stage container body by redrawing the sidewall and bottom wall by reducing the diameter of the bottom wall and increasing the axial height of the sidewall to a height substantially equal to the said predetermined axial height of the container body while maintaining the metal thickness of the bottom wall and sidewall to that of the metal blank; andC) redrawing the first stage container body into the container body by imparting a final taper to said sidewall.