Outer blade cutting wheel and making method

Abstract

An outer blade cutting wheel includes an annular thin disc base and a blade section of bonded abrasive grains formed on the periphery of the base. The blade section includes widthwise side portions each of which is provided with channels extending from an inner perimeter to an outer perimeter of the blade section. The cutting wheel is capable of cutoff machining at a high feed speed while maintaining a high accuracy and a low cutting load.

1 . An outer blade cutting wheel comprising an annular thin disc base having a pair of planar surfaces and a periphery, and a blade section composed of abrasive grains and a bond and formed on the periphery of the base,
 wherein the blade section includes widthwise side portions each of which is provided with channels extending from an inner perimeter to an outer perimeter of the blade section.   
     
     
         2 . The cutting wheel of  claim 1  wherein the channels penetrate through the blade section at both the inner perimeter and the outer perimeter, or the channels penetrate through the blade section at the inner perimeter and are closed at the outer perimeter. 
     
     
         3 . The cutting wheel of  claim 1  wherein the channels extend in a radial direction of the base or at an angle of up to 60° relative to the radial direction. 
     
     
         4 . The cutting wheel of  claim 1  wherein the channels reach the base or an underlay on the base if any. 
     
     
         5 . The cutting wheel of  claim 1  wherein the bond is an electroplating metal. 
     
     
         6 . A method for preparing the outer blade cutting wheel of  claim 5 , comprising the steps of:
 clamping the base at its planar surfaces between a pair of jig segments so as to cover a portion, exclusive of the periphery, of the base where the blade section is not to be formed, and attaching a mesh member to the jig segments to define a cavity extending along and surrounding the base periphery, the mesh member having openings sufficient to allow passage of gas and liquid, but insufficient to allow passage of abrasive grains,   filling the cavity with abrasive grains and closing the cavity,   immersing the base, jig segments and mesh member in a plating solution, and   effecting electroplating with the base made cathode and allowing a plating metal to precipitate for thereby bonding the abrasive grains along with the plating metal onto the base periphery,   wherein each jig segment includes a flange which is spaced apart from the base periphery and defines the cavity in part and which is provided with protrusions for forming the channels.