Method of manufacturing an undercut deep-drawn workpiece

Details Method of manufacturing an undercut deep-drawn workpiece Method of manufacturing an undercut deep-drawn workpiece

1996-05-22

1998-07-07

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723792, B21D 2200, B21D 2221, B21C 3702

Patent

active

057751595

ABSTRACT:
A method of manufacturing of an undercut deep-drawn workpiece from a sheet material including deforming a sheet material into a pot-shaped piece having a circular cross-section with a diameter, which decreases in a course of deformation, while retaining a flat circumferential rim flange, increasing a depth of the pot-shaped piece with formation of an outwardly cambered bottom substantially simultaneously with decreasing the diameter of the pot-shaped piece, forming, one after another, two opposite flat surface side walls on the pot-shaped piece, with bringing them into divergent, relative to each other, angular positions, while synchronously flattening the bottom of the pot-shaped piece, and forming two further opposite parallel flat surface side walls to obtain a substantially rectangular cross-section of the pot-shaped piece.

REFERENCES:
patent: 1389739 (1921-09-01), Carlson
patent: 1891316 (1932-12-01), Nyberg
patent: 4423616 (1984-01-01), Pease
patent: 4453395 (1984-06-01), Takeda et al.

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