Polishing method for a workpiece and polishing tool used for the polishing method

Abstract

Provided is a polishing tool capable of forming a high-quality surface of a workpiece for a short period of time. A polishing tool includes: a rotation shaft arranged parallel to a sending direction of moving the polishing tool relative to a workpiece; and at least two polishing bodies. The polishing body includes a foamed resin such as a foamed polyurethane resin, and has an outer peripheral surface having a porosity higher than that of the polishing body. The polishing body includes a non-foamed resin such as a non-foamed polyurethane resin being a material more rigid than that for the polishing body. When polishing-processing, the polishing body performs polishing removal on a surface of the workpiece, and the polishing body smoothes a waviness formed on the surface through the polishing removal.

1 . A polishing tool for polishing-processing a surface of a workpiece, comprising:
 a rotation shaft;   a disk-like first polishing body, which is provided to the rotation shaft and includes an outer peripheral surface serving as a work surface; and   a disk-like second polishing body, which is provided to the rotation shaft so as to be adjacent to the first polishing body and includes an outer peripheral surface serving as a work surface, wherein:   the outer peripheral surface of the first polishing body is formed into a shape having a porosity higher than a porosity of the outer peripheral surface of the second polishing body; and   the second polishing body comprises a material more rigid than a material for the first polishing body.   
     
     
         2 . The polishing tool according to  claim 1 , further comprising a support member provided for deformation prevention on a side surface of at least one of the first polishing body and the second polishing body. 
     
     
         3 . The polishing tool according to  claim 1 , wherein the first polishing body comprises a foamed resin. 
     
     
         4 . The polishing tool according to  claim 1 , wherein the outer peripheral surface of the second polishing body comprises multiple grooves formed parallel to a direction of the rotation shaft. 
     
     
         5 . A workpiece processing method for polishing-processing a surface of a workpiece, comprising:
 bringing a disk-like first polishing body and a disk-like second polishing body into press-contact with a workpiece, the first polishing body and the second polishing body being adjacently provided to a same rotation shaft and each including an outer peripheral surface serving as a work surface; and   moving the first polishing body and the second polishing body relative to the workpiece in a direction parallel to the rotation shaft, to thereby process the surface of the workpiece, wherein:   the outer peripheral surface of the first polishing body is formed into a shape having a porosity higher than a porosity of the outer peripheral surface of the second polishing body;   the second polishing body comprises a material more rigid than a material for the first polishing body; and   the second polishing body removes a waviness formed through processing performed by the first polishing body.   
     
     
         6 . The workpiece processing method according to  claim 5 , wherein the second polishing body is arranged, with respect to the first polishing body, upstream in a direction of moving the first polishing body and the second polishing body.