Can manufacturing method and device

Abstract

To provide a can manufacturing method performing air assist capable of smoothly pulling out a punch from a processed can by appropriately performing air assist. Provided is a can manufacturing method including drawing and/or drawing-and-ironing using a press machine, the method including stripping that includes removing a punch from a can after the drawing and/or the drawing-and-ironing. In the stripping, air is blown out from an air blowing port at a tip end of the punch to perform air assist of assisting extraction of the punch. In the air assist, a pressure of the air and/or a blowing timing of the air is adjusted for each shot to a pressure and/or a blowing timing according to a condition of the shot.

1 . A can manufacturing method including drawing and/or drawing-and-ironing using a press machine, the method comprising:
 stripping that includes removing a punch from a can after the drawing and/or the drawing-and-ironing, wherein   in the stripping, air is blown out from an air blowing port at a tip end of the punch to perform air assist of assisting extraction of the punch, and   in the air assist, a pressure of the air and/or a blowing timing of the air is adjusted for each shot to a pressure and/or a blowing timing according to a condition of the shot.   
     
     
         2 . The can manufacturing method according to  claim 1 , wherein
 the pressure of the air is adjusted to a pressure corresponding to an operation speed during the shot.   
     
     
         3 . The can manufacturing method according to  claim 1 , wherein
 when the shot is a shot for a first can after a start of an operation, the pressure of the air is adjusted to be higher than a pressure during a shot where other conditions of the shot are the same, and/or the blowing timing of the air is adjusted to be earlier than a blowing timing during a shot where the other conditions of the shot are the same.   
     
     
         4 . The can manufacturing method according to  claim 1 , wherein
 the blowing timing of the air is adjusted to a timing corresponding to an operation speed and/or the pressure of the air during the shot.   
     
     
         5 . The can manufacturing method according to  claim 1 , wherein
 the press machine is a body maker.   
     
     
         6 . A can manufacturing device for manufacturing cans using drawing and/or drawing-and-ironing, the device comprising:
 a punch; a stripper; and a controller, wherein   the punch includes an air blowing port configured to blow air at a tip end thereof, and   the controller performs air blowing control of blowing air from the air blowing port while the stripper is engaged with an end portion of a can and the punch is being removed from the can, and   in the air blowing control, a pressure of the air and/or a blowing timing of the air is adjusted for each shot to a pressure and/or a blowing timing according to a condition of the shot.   
     
     
         7 . The can manufacturing device according to  claim 6 , wherein
 the controller adjusts the pressure of the air to a pressure corresponding to an operation speed during the shot.   
     
     
         8 . The can manufacturing device according to  claim 6 , wherein
 when the shot is a shot for a first can after a start of an operation, the controller adjusts the pressure of the air to be higher than a pressure during a shot with the same other conditions of the shot, and/or adjusts the blowing timing of the air to be earlier than a blowing timing during a shot where other conditions of the shot are the same.   
     
     
         9 . The can manufacturing device according to  claim 6 , wherein
 the controller adjusts the blowing timing of the air to a timing corresponding to an operation speed and/or the pressure of the air during the shot.   
     
     
         10 . The can manufacturing method according to  claim 6 , wherein
 the manufacturing device is a body maker.