Method of grinding a cutter for skive-machining and device for grinding the skive-machining cutter

Abstract

A method of grinding a cutter for skive-machining a work and a device for grinding the skive-machining cutter which method and device allow formation of a better gear with a cutting operation. The target of grinding is a skive-machining cutter in which a plurality of helical groove portions are formed. A first grinding step is effected for grinding one of a pair of blade lateral faces facing the groove portion. A second grinding step is effected for grinding the other of the pair of blade lateral faces. Then, a third grinding step is effected for forming a blade tip face to be continuous with the blade lateral face formed in the first grinding step and the blade lateral face formed in the second grinding step.

1 . A method of grinding a skive-machining cutter having a plurality of cutting blade portions formed by forming a plurality of groove portions helically about a rotational axis in an outer circumference of a material so that the plurality of cutting blade portions are arranged at positions between respective adjacent pairs of the groove portions and radially about the rotational axis, the method comprising:
 a first grinding step for grinding one of a pair of blade lateral faces facing the groove portion;   a second grinding step for grinding the other of the pair of blade lateral faces; and   a third grinding step for grinding a blade tip face in a region extending from the pair of blade lateral faces to a projecting side of the cutting blade portion;   wherein an order is set such that the third grinding step is effected after the first grinding step and the second grinding step; and   wherein in the third grinding step, a grinding operation is effected such that the blade tip face formed by grinding is formed steplessly continuous with the one blade lateral face formed by the first grinding step and the other blade lateral face formed by the second grinding step.   
     
     
         2 . The method of grinding a skive-machining cutter according to  claim 1 , wherein the first grinding step employs a disc-like first grindstone having a grinding face having a shape along the one blade lateral face and driven to rotate for the grinding operation and the second grinding step employs a disc-like second grindstone having a grinding face having a shape along the other blade lateral face and driven to rotate for the grinding operation. 
     
     
         3 . The method of grinding a skive-machining cutter according to  claim 2 , wherein the third grinding step employs a third grindstone having a grinding face along the blade tip face and driven to rotate for the grinding operation; and the blade tip face formed by this third grindstone is formed continuous with the one blade lateral face formed by the first grindstone and the other blade lateral face formed by the second grindstone. 
     
     
         4 . The method of grinding a skive-machining cutter according to  claim 2 , wherein the grinding operation of the blade lateral face is effected by moving at least one of the first grindstone and the second grindstone toward a circumferential direction about the rotational axis by an amount needed for adjustment of blade thickness. 
     
     
         5 . The method of grinding a skive-machining cutter according to  claim 1 , wherein in the third grinding step, the grinding operation is effected by buff or blast of shot peening material. 
     
     
         6 . A device for grinding a skive-machining cutter comprising:
 a cutter supporting section for a skive-machining cutter having a plurality of cutting blade portions formed by forming a plurality of groove portions helically about a rotational axis in an outer circumference of a material so that the plurality of cutting blade portions are arranged at positions between respective adjacent pairs of the groove portions and radially about the rotational axis;   a first grinding section for grinding one of a pair of blade lateral faces facing the groove portion;   a second grinding section for grinding the other of the pair of blade lateral faces;   a third grinding section for grinding a blade tip face in a region extending from the pair of blade lateral faces to a projecting side of the cutting blade portion; and   a controlling section for controlling the device such that grinding operations by the first grinding section and the second grinding section are effected on the skive-machining cutter supported to the cutter supporting section and then a grinding operation is effected by the third grinding section for forming the blade tip face steplessly continuous with the one blade lateral face formed by the first grinding step and the other blade lateral face formed by the second grinding step.   
     
     
         7 . The method of grinding a skive-machining cutter according to  claim 3 , wherein the grinding operation of the blade lateral face is effected by moving at least one of the first grindstone and the second grindstone toward a circumferential direction about the rotational axis by an amount needed for adjustment of blade thickness. 
     
     
         8 . The method of grinding a skive-machining cutter according to  claim 2 , wherein in the third grinding step, the grinding operation is effected by buff or blast of shot peening material.