Press, method for manufacturing the metal plate, method for manufacturing the liquid spray head, method for manufacturing the liquid spray apparatus

Abstract

A pressing apparatus 30 performs plastic working by pressing a punch 36 into a metal plate 31. The pressing apparatus 30 includes a rough surface part 47 that is formed at a front-end-side area of an outer surface of the punch 36, the level of surface roughness of the rough surface part 47 being greater than that of other area part, and a smooth surface part 48 that is formed at a base-end-side area that is located at a relatively base-end side in comparison with the area of the rough surface part 47, the smooth surface part 48 being smoother than the rough surface part 47. The punch is inserted up to a point where the rough part goes beyond one surface of the metal plate that is opposite to the other surface thereof that is provided at a side at which the insertion of the punch into the metal plate is started. By this means, the formation of a bump on the punched-side surface is prevented.

1 . A pressing apparatus that performs plastic working by pressing a punch into a metal material plate, the pressing apparatus comprising:
 a rough part that is formed at least at a front-end-side area of an outer surface of the punch that is brought into contact with the metal material plate, the level of surface roughness of the rough part being greater than that of other area part.   
   
   
       2 . The pressing apparatus according to  claim 1 , further comprising a smooth part that is formed at a base-end-side area that is located at a relatively base-end side in comparison with the area of the rough part, the smooth part being smoother than the rough part, wherein the diameter of the rough part is not larger than that of the smooth part. 
   
   
       3 . The pressing apparatus according to  claim 1 , the punch being inserted up to a point where the rough part goes beyond one surface of the metal material plate that is opposite to the other surface thereof that is provided at a side at which the insertion of the punch into the metal material plate is started. 
   
   
       4 . The pressing apparatus according to  claim 3 , the punch including a straight part that is uniform in outer diameter from the front end of the punch toward the base end thereof; and the rough part being formed at a front-end-side area of an outer surface of the straight part whereas the smooth part is formed at a base-end-side area that is located at a relatively base-end side in comparison with the area of the rough part. 
   
   
       5 . The pressing apparatus according to  claim 4 , the punch including a tapered part that is formed at a relatively base-end side in comparison with the area of the straight part; the diameter of the tapered part gradually increasing from the front-end side toward the base-end side; and the rough part being formed in the outer surface of the tapered part. 
   
   
       6 . The pressing apparatus according to  claim 1 , the rough part being pear-peel finished. 
   
   
       7 . A metal plate manufacturing method for manufacturing a metal plate by forming a hole as a result of pressing a punch into a metal material plate, the metal plate manufacturing method comprising:
 a first step of forming a hole by pressing, into the metal material plate, the punch that includes a rough part that is formed at least at a front-end-side area of an outer surface of the punch that is brought into contact with the metal material plate, the level of surface roughness of the rough part being greater than that of other area part.   
   
   
       8 . The metal plate manufacturing method according to  claim 7 , in the first step, the punch being inserted up to a point where the rough part goes beyond one surface of the metal material plate that is opposite to the other surface thereof that is provided at a side at which the insertion of the punch into the metal material plate is started. 
   
   
       9 . The metal plate manufacturing method according to  claim 7 , further comprising a second step of removing a bulged part that is formed around the hole formed in the first step on the one surface of the metal material plate that is opposite to the other surface thereof that is provided at the side at which the insertion of the punch into the metal material plate is started. 
   
   
       10 . The metal plate manufacturing method according to  claim 7 , further comprising a step of surface treatment. 
   
   
       11 . A method for manufacturing a liquid spray head, comprising:
 mounting a metal plate that has been worked by means of the metal plate manufacturing method according to  claim 7 , as a nozzle plate from the hole of which liquid is ejected.   
   
   
       12 . A method for manufacturing a liquid spray apparatus, comprising:
 mounting a liquid spray head that has been manufactured by the liquid spray head manufacturing method according to  claim 11 .