Method for satining a ring made of rigid material and jig therefor

Abstract

Disclosed are a jig and a method for forming a satin surface on an outer peripheral surface of a ring made of a rigid material by processing the outer peripheral surface of the ring using a diamond bite in a state in which inner and outer peripheral surfaces of the ring do not represent a perfect roundness and a center of the outer peripheral surface of the ring is offset from that of the inner peripheral surface of the ring. The method includes the steps of supporting both sides of the ring while rotating the ring, and processing the outer peripheral surface of the ring by using the diamond bite.

1 . A method for forming a satin surface on an outer peripheral surface of a ring made of a rigid material by processing the outer peripheral surface of the ring using a diamond bite in a state in which inner and outer peripheral surfaces of the ring do not represent a perfect roundness and a center of the outer peripheral surface of the ring is offset from that of the inner peripheral surface of the ring, the method comprising the steps of: 
 supporting both sides of the ring while rotating the ring; and    processing the outer peripheral surface of the ring by using the diamond bite.    
   
   
       2 . The method as claimed in  claim 1 , further comprising the steps of: 
 interposing the ring between a first jig and a second jig, in which one end of the first jig is inserted into a chuck of a lathe and the second jig is fitted around a tail spindle, and rotating the ring by means of a rotational force of the chuck while supporting both sides of the ring using the first and second jigs; and    moving the diamond bite, which is installed in a feed unit of the lathe, toward the outer peripheral surface of the ring being rotated, thereby processing the outer peripheral surface of the ring, wherein the first and second jigs are aligned along a same rotational center line.    
   
   
       3 . A jig assembly unit used for forming a satin surface on an outer peripheral surface of a ring by processing the outer peripheral surface of the ring using a diamond bite installed in a feed unit of a lathe in a state in which inner and outer peripheral surfaces of the ring do not represent a perfect roundness and a center of the outer peripheral surface of the ring is offset from that of the inner peripheral surface of the ring, the jig assembly comprising: 
 a first jig fixedly inserted into a chuck of a headstock in such a manner that a front end portion of the first jig is able to support one side of the ring; and    a second jig fitted around a tail spindle of a tailstock in such a manner that a front end portion of the second jig is able to support the other side of the ring,    wherein the first and second jigs are aligned along a rotational center line of the chuck or the tail spindle,    the first jig has a tubular shape and a first chamfering section is formed on the front end portion of the first jig, and    a second chamfering section is formed on the front end portion of the second jig.    
   
   
       4 . The jig assembly as claimed in  claim 3 , wherein a flange is provided at an outer peripheral surface of a middle part of the second jig, a stepped portion is formed at an inner peripheral surface of the second jig such that the stepped portion makes contact with a tapered portion formed at a front end of the tail spindle, the stepped portion is tapered corresponding to the tapered portion of the tail spindle, a rear end portion of the second jig is inserted into a bearing fitted around the tail spindle, and the flange of the second jig makes contact with a front end portion of the bearing, so that the flange is biased toward the first jig by means of the bearing.