Method for forming a seamless stainless steel sink bowl with a grid ledge and product
US5644943A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1996 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Apr 22, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/18
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.