Method for manufacturing bottomed cylindrical body

Abstract

Provided is a manufacturing method of a bottomed cylindrical body, which can achieve both severe can making processing such as conventional drawing and ironing, and cost reduction and environmental load reduction in a washing step. A manufacturing method of a bottomed cylindrical body includes a drawing step of drawing a metal sheet by use of forming members each of which has a hardness of Hv 1500 to 12000 at its processing surface, and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a carbon film at its processing surface, and the coolant is a water-soluble coolant or a coolant having a boiling point of lower than 300° C., or a manufacturing method of a bottomed cylindrical body includes a drawing step of drawing a metal sheet by use of a drawing die, which has a hardness of more than Hv 1500 to 12000 at its processing surface, and a drawing punch, which has a hardness of Hv 1000 to 12000 at its processing surface, and an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a hardness of Hv 1500 to 12000 at its processing surface, and the coolant satisfies at least any one of (a) a coolant of lower than 4.0 vol. % concentration of contained oil, (b) a water-soluble coolant, and (c) a coolant having a boiling point of lower than 300° C.

1 . A manufacturing method of a bottomed cylindrical body, comprising:
 a drawing step of drawing a metal sheet by use of forming members each of which has a hardness of more than Hv 1500 to 12000 at a processing surface thereof; and   an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a carbon film at a processing surface thereof,   wherein the coolant is a water-soluble coolant and/or a coolant having a boiling point of lower than 300° C.   
     
     
         2 . The manufacturing method according to  claim 1 , wherein the bottomed cylindrical body is a seamless can body. 
     
     
         3 . The manufacturing method according to  claim 1 , wherein the metal sheet is an aluminum alloy. 
     
     
         4 . The manufacturing method according to  claim 1 , wherein the carbon film is a diamond film. 
     
     
         5 . The manufacturing method according to  claim 1 , further comprising:
 before the drawing step of drawing the metal sheet, a lubricant application step of applying, to the metal sheet, a water-soluble lubricant and/or a lubricant having a boiling point of lower than 300° C.,   wherein the hardness of the processing surface of each forming member in the drawing step is Hv 1500 to 12000.   
     
     
         6 . The manufacturing method according to  claim 1 , wherein the coolant contains a preservative and/or a corrosion inhibitor. 
     
     
         7 . The manufacturing method according to  claim 1 , further comprising:
 a washing step of removing a lubricant and/or the coolant attached on a surface of the bottomed cylindrical body.   
     
     
         8 . The manufacturing method according to  claim 1 , further comprising:
 a purification step of purifying effluent discharged in the ironing step and/or a washing step.   
     
     
         9 . A manufacturing method of a bottomed cylindrical body, comprising:
 a drawing step of drawing a metal sheet by use of a drawing die, which has a hardness of more than Hv 1500 to 12000 at a processing surface thereof, and a drawing punch, which has a hardness of Hv 1000 to 12000 at a processing surface thereof; and   an ironing step of ironing a workpiece into the bottomed cylindrical body via a coolant by use of forming members each of which has a hardness of Hv 1500 to 12000 at a processing surface thereof,   wherein the coolant satisfies at least any one of (a) a coolant of lower than 4.0 vol % concentration of contained oil, (b) a water-soluble coolant, and (c) a coolant having a boiling point of lower than 300° C.   
     
     
         10 . The manufacturing method according to  claim 9 , wherein the bottomed cylindrical body is a seamless can body. 
     
     
         11 . The manufacturing method according to  claim 9 , wherein the metal sheet is an aluminum alloy. 
     
     
         12 . The manufacturing method according to  claim 9 ,
 wherein a carbon film is formed on the processing surface of each forming member in the drawing step, and/or on the processing surface of each forming member in the ironing step.   
     
     
         13 . The manufacturing method according to  claim 9 , further comprising:
 before the drawing step, a lubricant application step of applying a lubricant to surfaces of the metal sheet,   wherein the hardness of the processing surface of the drawing die in the drawing step is Hv 1000 to 12000.   
     
     
         14 . The manufacturing method according to  claim 9 , further comprising:
 a purification step of purifying effluent discharged in the ironing step or a washing step after the ironing step.