Method for making punch head of paper punch

Abstract

A method for making punch heads includes a step of pulling a cylindrical metal material wrapped around a mandrel; a step of cutting the cylindrical metal material into sections; a step of inserting the sections into concavity of a mold set and punching a recess in a first end of each section by a first tool; a step of punching the recess into V-shaped recess and including a punching edge by a second tool; a step of pushing the sections out from the mold set by a pushing rod; and a step of obtaining a punch head.

1 . A method for making punch heads, comprising: 
 step  1 : pulling cylindrical metal material wrapped around a mandrel;    step  2 : cutting the cylindrical metal material into sections;    step  3 : inserting the sections into concavity of a mold set and punching a recess in a first end of each section by a first tool;    step  4 : punching the recess into a V-shaped recess and including a punching edge by a second tool;    step  5 : pushing the sections out from the mold set by a pushing rod;    step  6 : obtaining a punch head.    
   
   
       2 . The method as claimed in  claim 1  further comprising two guide wheels and the cylindrical metal material being transported by rotation of the two guide wheels.  
   
   
       3 . The method as claimed in  claim 1 , wherein a second end of each section is pressed to form a rounded edge in step  3 .  
   
   
       4 . The method as claimed in  claim 1 , wherein the cylindrical metal material is a solid cylindrical strip.  
   
   
       5 . The method as claimed in  claim 1 , wherein the concavity includes a narrow section which forms an inclined shoulder and the second end of each section is pressed onto the inclined shoulder to form the rounded edge.  
   
   
       6 . The method as claimed in  claim 1  further comprising a step of making a groove or a hole in the section between steps  5  and  6 .