Method of stamping for aluminum or aluminum alloy sheet

B - Operations – Transporting – 21 – D

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Details

B21D 22/10 (2006.01) B21D 22/20 (2006.01) B21D 37/16 (2006.01) B21D 37/18 (2006.01) C10M 101/02 (2006.01) C10M 105/04 (2006.01) C10M 105/38 (2006.01)

Patent

CA 2091035

ABSTRACT A method of stamping for an aluminum or aluminum alloy sheet which comprises coating a liquid lubricant which becomes waxy at a cryogenic temperature to the aluminum or aluminum alloy plate, cooling the sheet and applying stamping in a cryogenic temperature region by using a die of a non-cooling structure type, by which formability is improved. A mineral series or synthetic oil series lubricant is used as the liquid lubricant. Further, a lubricant containing paraffin as the main ingredient and having a viscosity at 40°C of less than 50 cSt or a lubricant containing an ester as the main ingredient, having a pour point from within a range - 50°C to -100°C and a viscosity at 40°C of less than 50 cSt is used. In another forming method, stamping is applied by using a cooling structure type form made of a material not causing transition temperature and in which liquid nitrogen is circulated through the inside of a punch for cooling and is jetted out from upper portion thereof as a forming die, while controlling the die temperature to a range from -50°C to -196°C and controlling the aluminum or aluminum alloy sheet to a range from -50°C to -196°C, by which the formability - 35 - equal with or superior to that of the steel sheet can be obtained. - 36 -

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