US 4,732,031 A · Method of forming a deep-drawn and ironed container

Abstract

A method of forming a deep-drawn and ironed container having a bottom profile wherein a cup is formed by drawing an inverted cup and reverse drawing the cup and simultaneously imparting a bottom profile thereto while controlling the thickness of the material in the bottom. The method also includes providing support to the profiled bottom while ironing the cup thus formed. The method is accomplished by a system which includes a draw-redraw station wherein the inverted cup is adjustably held by a fluidly actuated lift out ring and draw pad in the bottom area against a punch during reverse drawing to control metal thickness in the bottom. A separate pressure sleeve is also engaged with the profiled bottom during ironing to prevent pulling material from the bottom.

Claims8

Dependent claims

A method of forming a deep drawn and ironed container having a profiled bottom, comprising the steps of:

(a) blanking a generally circular blank;
(b) wiping the peripheral edge of the blank about a die core ring to form an inverted cup;
(c) reverse drawing the inverted cup and forming a profiled bottom by advancing a punch having a contoured central portion against a movable die core having a complementally contoured central portion;
(d) removing the profiled cup to a body maker;
(e) engaging the profiled cup between an ironing punch and a profiling post;
and
(f) passing said cup through one or more ironing rings while supporting the profiled area thereof.

4 more elements

Dependencies are inferred from the claim text.

Method of forming a deep-drawn and ironed container

Life of this patent

Method of forming a deep-drawn and ironed container

Life of this patent

Abstract

Claims8