Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1996-04-22
1997-07-08
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72350, B21D 2200, B21D 2221
Patent
active
056449437
ABSTRACT:
A method for forming a stainless steel sink bowl having a top edge, a sidewall and a bottom surface interconnected by smooth corner surfaces from a single sheet is provided. The method comprises drawing a stainless steel blank between a first draw die and a first forming die to form a first drawn blank having an unfinished bowl with a length, width and depth which are less than the finished length and width and generating a deformation warmth in the blank at the corner surfaces in proximity to the rim as the first drawn blank is being formed to a temperature of approximately 70.degree. C. to 90.degree. C. The first drawn blank is immediately removed from the first draw die and the first forming die and transferred to a finish draw die. The first drawn blank is finish drawn, prior to loss of the deformation warmth, between the finish draw die and a finish forming die to form a finish drawn blank having a finished bowl while simultaneously forming a grid ledge at a medial position in a portion of the sidewall of the finished bowl. A stainless steel sink bowl formed from a single sheet of material and having a grid ledge is also provided.
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Franke 1193 Catalog, pp. 10, 12 and cover (front and back) showing cast sink bowls with ledge.
Butler Rodney A.
Franke Inc.
Larson Lowell A.
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