Method of levelling two-layered clad metal sheet
US4768363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Jul 2, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2001/383
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for preventing the camber of a two-layered clad metal sheet having a base layer and a covering layer of different metals which exhibit different amounts of thermal contraction. The method comprises developing a temperature difference .DELTA. T expressed by the following formula between the base layer and the covering layer during a hot levelling, by providing a greater cooling effect before or during levelling to the layer which exhibits the greater thermal contraction than to the layer which exhibits the smaller thermal contraction: EQU .DELTA.T=f (.DELTA..alpha., .alpha., a, To) where, PA1 .DELTA..alpha.: the difference in thermal expansion coefficient between both metals PA1 a: the clad ratio (ratio of covering layer thickness to total sheet thickness) PA1 To: hot leveller inlet temperature (.degree.C.) PA1 .alpha.: mean thermal expansion coefficient of both metals. Since the layer which exhibits a greater thermal contraction is forcibly cooled before or during a hot levelling adequately and by a required amount, the clad metal sheet does not exhibit any substantial camber after cooled down to the room temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.