Roll die assemblies for pilger mills

Abstract

The utilization of smaller dies than those originally intended for a given size pilger mill is made possible for the first time by a new means of strengthening the necessarily small diameter shaft and by novel bearing blocks wherein smaller bearings are mounted off center. The smaller die assembly constructed according to this invention is completely and simply interchangeable with the original die sets and can be inserted in the pilger mill as a matter of course without modifications or adjustments to the machine proper.

1 . A die assembly for insertion into an already existing pilger mill said die assembly containing a set of smaller diameter dies than the mill was originally designed and built for, said dies being elongated transversely to increase their width to almost reach the inside members of the existing mill saddle and mounted by shrink fit on shafts, said shafts being supported by bearings mounted in bearing blocks with off-center bore, center line of said bearings being approximately as much closer to the center line of the pass as the difference said dies' radius and the radius of the larger dies originally designed for the mill. 
   
   
       2 . A die assembly as described in  claim 1  having dies of any width less than the dimension between the saddle sides of the pilger mill. 
   
   
       3 . A die assembly as described in  claim 1  in which a smaller ring die replaces a larger half die. 
   
   
       4 . A pilger mill die assembly with dies any diameter within 17 inches and 3 inches with the roll shafts strengthened by shrinking on the die and said shaft repositioned in the bearing blocks.