Di forming water-based coolant of laminated metal sheet and method of di forming laminated metal sheet

Abstract

A method of DI forming a laminated metal sheet includes drawing a laminated metal sheet; and redrawing and ironing the drawn laminated metal sheet, wherein a water-based coolant including (a) at least one base selected from the group consisting of alkanolamines and alkali metal hydroxides, (b) a fatty acid, and (c) water is used in the redrawing and ironing, and wherein a total content of the base (a) and the fatty acid (b) is 0.02 to 4% by mass and a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is 80 to 100% by mass.

1 . A method of DI forming a laminated metal sheet comprising:
 drawing a laminated metal sheet; and   redrawing and ironing the drawn laminated metal sheet,   wherein a water-based coolant comprising (a) at least one base selected from the group consisting of alkanolamines and alkali metal hydroxides, (b) a fatty acid, and (c) water is used in the redrawing and ironing, and   wherein a total content of the base (a) and the fatty acid (b) is 0.02 to 4% by mass and a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is 80 to 100% by mass.   
     
     
         2 . The method according to  claim 1 , wherein a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is about 90 to 100% by mass. 
     
     
         3 . The method according to  claim 1 , wherein pH of the water-based coolant at 40° C. is 7.3 to 11.5. 
     
     
         4 . The method according to  claim 1 , wherein the at least one base (a) is selected from the group consisting of ethanolamine or the alkali metal hydroxides. 
     
     
         5 . The method according to  claim 1 , wherein a molar ratio of the base (a)/the fatty acid (b) is 0.42 to 4.1. 
     
     
         6 . The method according to  claim 1 , wherein the straight-chain fatty acid in the fatty acid (b) is at least one kind selected from the group consisting of caproic acid, caprylic acid, and capric acid. 
     
     
         7 . The method according to  claim 1 , wherein a metal sheet constituting the laminated metal sheet is a chromium steel sheet or a tinned steel sheet. 
     
     
         8 . A method of manufacturing a laminated DI-formed body by DI forming a laminated metal sheet comprising:
 drawing a laminated metal sheet into a cup; and   redrawing and ironing the cup into the laminated DI body,   wherein a water-based coolant comprising (a) at least one base selected from the group consisting of alkanolamines and alkali metal hydroxides, (b) a fatty acid, and (c) water is used in the redrawing and ironing,   wherein a total content of the base (a) and the fatty acid (b) is 0.02 to 4% by mass and a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is 80 to 100% by mass.   
     
     
         9 . The method according to  claim 8 , wherein a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is about 90 to 100% by mass. 
     
     
         10 . The method according to  claim 8 , wherein pH of the water-based coolant at 40° C. is 7.3 to 11.5. 
     
     
         11 . The method according to  claim 8 , wherein the at least one base (a) is selected from the group consisting of ethanolamine or the alkali metal hydroxides. 
     
     
         12 . The method according to  claim 8 , wherein a molar ratio of the base (a)/the fatty acid (b) is 0.42 to 4.1. 
     
     
         13 . The method according to  claim 10 , wherein the straight-chain fatty acid in the fatty acid (b) is at least one kind selected from the group consisting of caproic acid, caprylic acid, and capric acid. 
     
     
         14 . The method according to  claim 8 , wherein a metal sheet constituting the laminated metal sheet is a chromium steel sheet or a tinned steel sheet. 
     
     
         15 . A method of manufacturing a laminated DI-formed body by DI forming a laminated metal sheet comprising:
 drawing a laminated metal sheet into a cup; and   redrawing an ironing the cup into the laminated DI body,   wherein a water-based coolant comprising as least (a) a base selected from the group consisting of ethanolamines and alkali metal hydroxides, (b) a fatty acid, and (c) water is used in the redrawing and ironing,   wherein a total content of the base (a) and the fatty acid (b) is 0.02 to 4% by mass, a ratio of a straight-chain fatty acid having a carbon number of 6 to 12 in the fatty acid (b) is about 90 to 100% by mass, pH of the water-based coolant at 40° C. is 7.3 to 11.5, and a molar ratio of the base (a)/the fatty acid (b) is 0.42 to 4.1.   
     
     
         16 . The method according to  claim 15 , wherein the straight-chain fatty acid in the fatty acid (b) is at least one kind selected from the group consisting of caproic acid, caprylic acid, and capric acid. 
     
     
         17 . The method according to  claim 1 , wherein the straight-chain fatty acid in the fatty acid (b) has a carbon number of 6 to 10. 
     
     
         18 . The method according to  claim 8 , wherein the straight-chain fatty acid in the fatty acid (b) has a carbon number of 6 to 10. 
     
     
         19 . The method according to  claim 15 , wherein the straight-chain fatty acid in the fatty acid (b) has a carbon number of 6 to 10.