Rolling die

Abstract

A rolling die is provided. The rolling die includes a bite portion having bite processing teeth at a bite starting point for a workpiece, and a finishing portion having finishing processing teeth. The bite processing teeth at the starting point in the bite portion have lower tooth height than the finishing processing teeth in the finishing portion. The bite processing teeth have a larger tooth tip angle and a larger trough angle than the finishing processing teeth.

1 . A rolling die, comprising: 
 a bite portion having bite processing teeth at a bite starting point for a workpiece; and    a finishing portion having finishing processing teeth, wherein the bite processing teeth at the bite starting point in the bite portion have lower tooth height than the finishing processing teeth in the finishing portion, and the bite processing teeth have a larger tooth tip angle and a larger trough angle than the finishing processing teeth.    
   
   
       2 . The rolling die of  claim 1 , wherein the tooth height of the bite processing teeth becomes continuously higher toward the finishing portion, and a trough becomes deeper and wider from the bite portion to the finishing portion.  
   
   
       3 . The rolling die of  claim 1 , wherein the bite processing teeth have a tooth tip angle and a trough bottom angle of 60 degrees or greater, and the trough angle between the finishing processing teeth corresponds to a standard trough angle value for a screw.  
   
   
       4 . The rolling die of  claim 2 , wherein the bite processing teeth have a tooth tip angle and a trough bottom angle of 60 degrees or greater, and the trough angle between the finishing processing teeth corresponds to a standard trough angle value for a screw.  
   
   
       5 . The rolling die of  claim 1 , further including a pair of solid-rectangular shaped die members having the bite portion and the finishing portion.  
   
   
       6 . The rolling die of  claim 2 , further including a pair of solid-rectangular shaped die members having the bite portion and the finishing portion.  
   
   
       7 . The rolling die of  claim 3 , further including a pair of solid-rectangular shaped die members having the bite portion and the finishing portion.  
   
   
       8 . The rolling die of  claim 4 , further including a pair of solid-rectangular shaped die members having the bite portion and the finishing portion.  
   
   
       9 . The rolling die of  claim 1 , further including a pair of cylindrical die members having the bite portion and the finishing portion.  
   
   
       10 . The rolling die of  claim 2 , further including a pair of cylindrical die members having the bite portion and the finishing portion.  
   
   
       11 . The rolling die of  claim 3 , further including a pair of cylindrical die members having the bite portion and the finishing portion.  
   
   
       12 . The rolling die of  claim 4 , further including a pair of cylindrical die Members having the bite portion and the finishing portion.