Rolling Processing Device and Rolling Processing Method

Abstract

A rolling processing device and a rolling processing method are provided to be capable of producing annular members by rolling-forming three or more cylindrical members at the same time while reducing the possibility of breakage of a mandrel. For this purpose, a rolling processing device includes a forming roll, a support roll, and a mandrel. Plural workpieces are arranged on the mandrel alternately in the radial direction of the mandrel. The rolling processing method includes an arranging process for arranging the workpieces on the mandrel and a rolling process.

1 . A rolling processing device comprising:
 a forming roll configured to abut with an outer peripheral surface of a cylindrical member;   a support roll configured to abut with the outer peripheral surface of the cylindrical member; and   a mandrel having an outer peripheral surface configured to abut with an inner peripheral surface of the cylindrical member,   wherein rotary shafts of the forming roll, the support roll, and the mandrel are arranged to be capable of getting closer to one another,   wherein at least three of the cylindrical members are arranged on the outer peripheral surface of the mandrel alternately in a radial direction of the mandrel,   wherein a plurality of protrusions, each having a disc shape, are provided on the forming roll and the support roll depending on the number of the cylindrical members, and   wherein outer peripheral surfaces of the plurality of protrusions of at least one of the forming roll or the support roll are pressed against the outer peripheral surface of the cylindrical member.   
     
     
         2 . The rolling processing device according to  claim 1 , wherein at least a first engaging groove is provided on the outer peripheral surface of the mandrel, the first engaging groove having a diameter decreasing in an axial direction of the mandrel, and being configured to abut the inner peripheral surfaces of the three or more of the cylindrical members alternately in the radial direction of the mandrel. 
     
     
         3 . The rolling processing device according to  claim 2 , wherein a second engaging groove is provided on the outer peripheral surface of at least one of the forming roll or the support roll to be engaged with the outer peripheral surface of the cylindrical member and an end surface in the axial direction of the cylindrical member to correspond to the first engaging groove. 
     
     
         4 . The rolling processing device according to  claim 1 , wherein a plurality of the first engaging grooves are provided depending on the number of the cylindrical members. 
     
     
         5 . The rolling processing device according to  claim 1 , wherein a pair of rotating bodies are provided on at least one of the forming roll or the support roll to be arranged rotatably with respect to the forming roll and the support roll, which are opposed to each other in the axial direction, and are configured to bias both end surfaces of the cylindrical member in the axial direction. 
     
     
         6 . A rolling processing method comprising:
 an arranging process for arranging a cylindrical member in a rolling processing device comprising a forming roll configured to abut with an outer peripheral surface of the cylindrical member, a support roll configured to abut with the outer peripheral surface of the cylindrical member, and a mandrel having an outer peripheral surface configured to abut with an inner peripheral surface of the cylindrical member, rotary shafts of the forming roll, the support roll, and the mandrel being arranged to be capable of getting closer to one another; and   a rolling-forming process for rolling-forming the cylindrical member to expand a diameter of the cylindrical member by use of the forming roll and the mandrel to produce annular members,   wherein the arranging process is a process for arranging at least three of the cylindrical members in an axial direction of the mandrel with respect to a first engaging groove provided on the outer peripheral surface of the mandrel such that the inner peripheral surfaces of the at least three f the cylindrical members abut alternately in a radial direction of the mandrel and an outer peripheral surface of at least one of the protrusions of the forming roll or the support roll abuts with the outer peripheral surface of the cylindrical member.   
     
     
         7 . The rolling processing method according to  claim 6 , wherein a plurality of the first engaging grooves are provided depending on the number of the cylindrical members. 
     
     
         8 . The rolling processing method according to  claim 6 , wherein a pair of rotating bodies are provided on at least one of the forming roll or the support roll to be arranged rotatably with respect to the forming roll and the support roll, which are opposed to each other in the axial direction, and are configured to bias both end surfaces of the cylindrical member in the axial direction.