Patent ID: 7240531
Filing Date: 2007-07-10
Classification: B21D

Abstract:
1. A press for forming a container with a bottom profile having a preselected height and a sidewall having a preselected height from a supply of material entering the press at a forming station, the press comprising: a punch with a preselected profile secured to the press which is selectively actuated up and down by movement of the press; a pressure sleeve concentrically slidably disposed around the punch; a blank and draw punch secured to the press which is concentrically disposed around the pressure sleeve with the blank and draw punch being selectively actuated up and down by movement of the press; a fixed base having a top surface and a bottom surface; a die core riser supported within the fixed base which is axially movable within the base; a profile pad with a preselected profile secured to an end of the die core riser with the profile pad being structured to be disposed within the fixed base in opposed relationship to the punch; a redraw die concentrically disposed around a portion of the profile pad in opposed relationship to the pressure sleeve; a draw pad concentrically slidably disposed around the redraw die in opposed relationship to the blank and draw punch; a cut edge located adjacent to the draw pad; a piston operatively connected to the die core riser; a cylinder disposed below the base which houses the piston; a first passage communicating with the cylinder above the piston and a second passage communicating with the cylinder below the piston, the passages being connected to a fluid or gas supply to selectively pressurize the cylinder on at least one side of the piston, whereby the passages selectively control movement of the profile pad up and down through movement of the die core riser up and down for the profile pad to selectively form the bottom profile in the container in cooperation with the punch; a biasing member located in the base structured to accommodate expansion in at least one of the profile pad and the punch and in at least one of the redraw die and the pressure sleeve during operation of the press; wherein the blank and draw punch is structured to blank the material against the cut edge and draw the material into an inverted container by wiping the material over the redraw die during descent of the blank and draw punch while the pressure sleeve and redraw die hold the material between the pressure sleeve and the redraw die; wherein the punch is structured to redraw the inverted container into a container by pulling the inverted container over the redraw die during descent of the punch; wherein the profiled punch and the profile pad are structured to cooperate with each other to form the bottom profile of the container; and wherein the biasing member located in the base is compressed as the at least one of the profile pad and the punch and the at least one of the redraw die and the pressure sleeve expand due to heat generated by the press during operation of the press in order to control the height of the bottom profile and the height of the sidewall of the container.