A die or punch for a press tool

Abstract

A die or punch is provided for a press tool. The die or punch includes a body and a roller assembly having a holder and a roller. The holder is shaped to slidably engage with a complementary cavity in the body to facilitate secure installation of the holder in the body. The holder is able to be removably inserted into the body to present the roller as a forming edge to shape a work piece in a press tool. The roller is able to turn with respect to the holder when shaping a work piece to protect the roller against wear.

1 - 21 . (canceled) 
     
     
         22 . A die or punch for a press tool comprising:
 a body; and   a roller assembly having a holder and a roller;   
       the holder shaped to slidably engage with a complementary cavity in the body to facilitate secure installation of the holder in the body, the holder being able to be removably inserted into the body to present the roller as a forming edge to shape a work piece in a press tool, the roller being able to turn with respect to the holder when shaping the work piece to protect the roller against wear. 
     
     
         23 . A die or punch for a press tool according to  claim 22 , wherein the roller comprises a cylinder arranged to turn, and which is replaceable, with respect to the holder. 
     
     
         24 . A die or punch for a press tool according to  claim 23 , wherein the roller is releasably secured to the holder by way of a clip. 
     
     
         25 . A die or punch for a press tool according to  claim 23 , wherein the roller has a groove to facilitate securement by the clip. 
     
     
         26 . A die or punch for a press tool according to  claim 23 , wherein the holder comprises a slot to facilitate securement of the clip. 
     
     
         27 . A die or punch for a press tool according to  claim 23 , wherein the clip is generally in a horseshoe shape. 
     
     
         28 . A die or punch for a press tool according to  claim 22 , wherein ends of the roller are held in end retaining plates and the roller is able to rotate with respect to the plates. 
     
     
         29 . A die or punch for a press tool according to  claim 22 , wherein the holder has at least one channel adapted to enable the passage of lubricant from an aperture in the holder to the roller. 
     
     
         30 . A die or punch for a press tool according to  claim 29 , wherein there are two of the channels which run from opposite ends of the holder. 
     
     
         31 . A die or punch for a press tool according to  claim 30 , wherein the holder has at least one fastening groove in a side thereof adapted to engage with a complementary protrusion in the body to facilitate secure installation of the holder in the body. 
     
     
         32 . A die or punch for a press tool according to  claim 31 , wherein there are two of the fastening grooves, each running substantially the length of opposite sides of the holder. 
     
     
         33 . A die or punch for a press tool according to  claim 22 , wherein the holder is shaped to retain the roller in place in the press tool. 
     
     
         34 . A die or punch for a press tool according to  claim 22 , wherein the roller assembly is at an angle with respect to the body. 
     
     
         35 . A die or punch for a press tool according to  claim 22 , wherein the press tool is fitted to a power press. 
     
     
         36 . A die or punch for a press tool according to  claim 22 , wherein the press tool is formed from hardened steel. 
     
     
         37 . A die or punch for a press tool according to  claim 22 , wherein the roller assembly is retrofitted to the die or punch. 
     
     
         38 . A die or punch for a press tool according to  claim 22 , wherein the holder has a wider portion at or towards the base of the holder when compared to the roller end of the holder.