Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1991-07-29
1992-09-22
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72347, B21D 2226
Patent
active
051486962
ABSTRACT:
A process for manufacturing an integral metal furniture top having formed and drawn sides and connecting drawn corners in a single step. Each connecting corner has a radius of approximately 3/32 inch. A segmented die is employed having surface treated steel corner pieces with working faces at an approximately 90.degree. angle and steel side pieces having a compound working face including a metal forming face and a trailing coining projection for substantially removing the shockline produced during the forming operation. A metal blank has metal cut out of each corner that would interfere with the drawing process. The metal blank is placed on a mandrel and surrounding pressure plate. The segmented die then closes on the metal blank forming the sides and drawing the corners of the furniture top in a single operation. The sheet metal used to form the top is approximately 0.028 to 0.031 inch thick and to die/mandrel clearance is approximately 0.032 to 0.033 inch. The furniture top and segmented die are also disclosed.
REFERENCES:
patent: 1944527 (1934-01-01), Pfaendler
patent: 3314275 (1967-04-01), Mullen
patent: 4833903 (1989-05-01), de Smet
Larson Lowell A.
Spectta Products Corporation
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