Method for manufacturing treatment device and treatment device

Abstract

A tapered cutting edge portion and a continuous raise portion from the tapered cutting edge portion are ground in an edge portion of a straight grinding raw material so that an eccentricity is not generated. In a method for grinding a treatment device, one end portion of a tapered grinding raw material is inserted between a grinding surface of a grindstone and a pressing surface of a press block, and finishing surfaces opposite each other while having a predetermined dimension, shape, and angle are ground so that a direction in which abrasive grains of the grindstone run corresponds to a direction of a shaft center. At this point, before the finishing surfaces are ground in the predetermined dimension, shape, and angle which are previously set corresponding to an objective reamer, pre-grinding is performed while a necessary finishing margin with respect to at least one of the surfaces, and then finishing grinding is performed to the other surface.

1 . A method for manufacturing a treatment device which grinds one side end portion of a thin bar-shaped raw material by pressing the thin bar-shaped raw material against a grinding surface of a rotating disk-shaped grindstone with a press block so that a direction of grinding traces is similar to an axial direction of a thin bar-shaped raw material in forming a first surface and an opposite second surface to the first surface at a predetermined dimension, shape, and angle by pressing the thin bar-shaped raw material against the grinding surface of the grindstone, 
 wherein pre-grinding leaving a finishing margin to be further ground in the first surface is performed in at least a first grinding operation and then a grinding operation grinding the second surface is performed.    
   
   
       2 . A method for manufacturing a treatment device according to  claim 1 , wherein after pre-grinding of the first surface, the second surface is ground in the predetermined dimension, shape, and angle by the second grinding operation, and the first surface is ground in the predetermined dimension, shape, and angle by a following grinding operation.  
   
   
       3 . A method for manufacturing a treatment device according to  claim 1 , wherein the pre-grinding leaving the finishing margin to be further ground in the second surface is performed even in at least the grinding operation of the second surface, the first surface is ground in the predetermined dimension, shape, and angle by the following grinding operation, and the second surface is ground in the predetermined dimension, shape, and angle by a fourth grinding operation.  
   
   
       4 . A method for manufacturing a treatment device according to  claim 1 , wherein the treatment device having a spiral groove is formed by twisting the thin bar-shaped raw material about the axial direction of the thin bar-shaped raw material, the first and second surfaces, which are in a relation of front and back, ground in the predetermined dimension, shape, and angle being formed in the thin bar-shaped raw material.  
   
   
       5 . A treatment device in which a first surface and an opposite second surface to the first surface are formed at a predetermined dimension, shape, and angle by pressing one side end portion of a thin bar-shaped raw material against an grinding surface of a rotating disk-shaped grindstone and by grinding the thin bar-shaped raw material while the thin bar-shaped raw material is pressed against the grinding surface of the grindstone with a press block so that a direction of grinding traces is similar to an axial direction of a thin bar-shaped raw material, wherein the treatment device which is formed by performing pre-grinding leaving a finishing margin to be further ground in a first grinding operation grinding at least the first surface.  
   
   
       6 . A treatment device according to  claim 5 , wherein the treatment device is formed by twisting the thin bar-shaped raw material about the axial direction of the thin bar-shaped raw material, the first and second surfaces, which are in a relation of front and back, ground in the predetermined dimension, shape, and angle being formed in the thin bar-shaped raw material.  
   
   
       7 . The method for manufacturing a treatment device according to  claim 2 , wherein the treatment device having a spiral groove is formed by twisting the thin bar-shaped raw material about the axial direction of the thin bar-shaped raw material, the first and second surfaces, which are in a relation of front and back, ground in the predetermined dimension, shape, and angle being formed in the thin bar-shaped raw material.  
   
   
       8 . The method for manufacturing a treatment device according to  claim 2 , wherein the treatment device having a spiral groove is formed by twisting the thin bar-shaped raw material about the axial direction of the thin bar-shaped raw material, the first and second surfaces, which are in a relation of front and back, ground in the predetermined dimension, shape, and angle being formed in the thin bar-shaped raw material.