B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 51/18 (2006.01) B21D 22/26 (2006.01)
Patent
CA 2203227
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°C to 90°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.
Franke Inc.
Gowling Lafleur Henderson Llp
Niro-Plan Ag
LandOfFree
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