Vibration Stop Device

Abstract

A vibration stop device that can prevent a problem caused by intrusion of a pressure contact region of a holding part of the vibration stop device into a recess of a processing region of a work includes a plurality of holding parts for the vibration stop which hold an outer circumferential surface of a columnar work in a process stage under a pressure contact state with pressure supplied from a hydraulic cylinder, and a pressure contact position on the outer circumferential surface is changed by rotation of the work, and an angular range formed by opposite ends of each of the holding parts for the vibration stop is larger than an angular range of the processing region regarding an angular range based on a position of an axis of the rotation.

1 . A vibration stop device comprising:
 a vibration stop device including a plurality of holding parts for a vibration stop for holding an outer circumferential surface of a columnar work in a process stage under a pressure contact state with pressure supplied from a hydraulic cylinder, and wherein a pressure contact position on the outer circumferential surface is changed by rotation of the work, and   an angular range around the work which is formed by two opposite ends of each of the holding parts for the vibration stop is larger than an angular range of a processing region of the work based on a position of an axis of the rotation.   
     
     
         2 . The vibration stop device according to  claim 1 , wherein the holding parts for the vibration stop each have an arc shaped surface on a pressure contact side thereof, and a radius of curvature of the arc is the same as a radius of curvature of the work. 
     
     
         3 . The vibration stop device according to  claim 1 , wherein the holding parts for the vibration stop each have an arc shaped surface on a pressure contact side thereof, and a radius of curvature of the arc is larger than a radius of curvature of the work. 
     
     
         4 . The vibration stop device according to  claim 1 , wherein the holding parts for the vibration stop each have a flat surface on a pressure contact side thereof. 
     
     
         5 . The vibration stop device according to  claim 1 ,
 wherein a pair of the holding parts for the vibration stop comes into pressure contact with two sides of the work, and the two sides of the work are rotatably connected to the pair of the holding parts for the vibration stop, and   further comprising a pressure transmission part which is interlocked with a single hydraulic cylinder for approaching and separating of the holding parts for the vibration stop to and from the work by changing oil pressure.   
     
     
         6 . The vibration stop device according to  claim 1 , wherein the holding parts for the vibration stop are each independently interlocked with a hydraulic cylinder for approaching and separating of the holding parts for the vibration stop to and from the work by changing oil pressure. 
     
     
         7 . The vibration stop device according to  claim 6 , wherein there are three said holding parts for the vibration stop. 
     
     
         8 . The vibration stop device according to  claim 1 , further comprising a hydraulic circuit for supplying pressure to achieve the pressure contact, the hydraulic circuit including a relief valve in juxtaposition with a solenoid valve for supplying oil pressure to the vibration stop device.