US2023119966A1PendingUtilityA1

Method for manufacturing bottomed cylindrical body

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Assignee: TOYO SEIKAN GROUP HOLDINGS LTDPriority: Mar 27, 2020Filed: Mar 9, 2021Published: Apr 20, 2023
Est. expiryMar 27, 2040(~13.7 yrs left)· nominal 20-yr term from priority
Inventors:Ryozo ShiroishiNaoya MatsumotoMasahiro ShimamuraTakuho KumagaiTomohiro Ogawa
C23G 1/36C23G 1/22C23G 1/125B21D 22/28B21D 22/286B21D 22/30B21D 35/005B21D 24/16B21D 51/26B21D 51/2669B21D 35/007B21D 37/18
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Claims

Abstract

There is provided a method for manufacturing a bottomed cylindrical body, the method being capable of achieving both a conventional hard can manufacturing process such as drawing and ironing and reduction in the cost and the environmental load in a degreasing step. The method for manufacturing a bottomed cylindrical body includes a lubricant application step of applying liquid (lubricant) having a viscosity of lower than 200 mPa·s to a surface of a metal plate, a drawing step of drawing the metal plate to which. the lubricant has been applied, with use of a forming member having a processing surface having a hardness of Hv 1000 to 12000, an ironing step of ironing, with use of another forming member having a processing surface having a hardness of Hv 1500 to 12000, a workpiece with a coolant interposed between the workpiece and the another forming member, to form a bottomed cylindrical body, and a degreasing step of degreasing oil on a surface of the bottomed cylindrical body with use of a cleaning agent. The concentration of oil contained in the coolant is lower than 4.0 percent by volume. The cleaning agent contains any one of sulfuric acid, hydrofluoric acid, potassium carbonate, sodium hydroxide, and potassium hydroxide. The temperature of the cleaning agent in the degreasing step is lower than 75° C.

Claims

exact text as granted — not AI-modified
1 . A method for manufacturing a bottomed cylindrical body, comprising:
 a lubricant application step of applying liquid lubricant having a viscosity of lower than 200 mPa·s to a surface of a metal plate;   a drawing step of drawing the metal plate to which the lubricant has been applied, with use of a forming member having a processing surface having a hardness of Hv 1000 to 12000;   an ironing step of ironing, with use of another forming member having a processing surface having a hardness of Hv 1500 to 12000, a workpiece with a coolant interposed between the workpiece and the another forming member, to form a bottomed cylindrical body; and   a degreasing step of degreasing oil on a surface of the bottomed cylindrical body with use of a cleaning agent, wherein   a concentration of oil contained in the coolant is lower than 4.0 percent by volume,   the cleaning agent contains any one of sulfuric acid, hydrofluoric acid, potassium carbonate, sodium hydroxide, and potassium hydroxide, and   a temperature of the cleaning agent in the degreasing step is lower than 75° C.   
     
     
         2 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the bottomed cylindrical body is a seamless can body. 
     
     
         3 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the metal plate is made of an aluminum alloy. 
     
     
         4 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the metal plate is a resin-coated metal plate having resin coated on at least one face thereof. 
     
     
         5 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein a weight change of the bottomed cylindrical body before and after the degreasing step is smaller than 100 mg/m2. 
     
     
         6 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein degreasing time in the degreasing step is shorter than 45 seconds. 
     
     
         7 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the viscosity of the lubricant is lower than 100 mPa·s. 
     
     
         8 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the viscosity of the lubricant is lower than 100 mPa·s and besides degreasing time in the degreasing step is equal to or shorter than 30 seconds. 
     
     
         9 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the cleaning agent contains any one of sulfuric acid, hydrofluoric acid, potassium carbonate, sodium hydroxide, and potassium hydroxide. 
     
     
         10 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , wherein the processing surface of the forming members is formed from carbon or ceramics. 
     
     
         11 . The method for manufacturing a bottomed cylindrical body according to  claim 10 , wherein the carbon is a diamond. 
     
     
         12 . The method for manufacturing a bottomed cylindrical body according to  claim 1 , further comprising:
 a purification step of purifying waste water discharged in the ironing step and/or the degreasing step.

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