Linear grinding member, brush-like grinding stone, and method for manufacturing linear grinding member

Abstract

A brush-like grinding stone ( 1 ) includes a linear grinding member ( 11 ) obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments. As the linear grinding member ( 11 ), a linear grinding member ( 11 A) having a square cross-sectional shape, a linear grinding member ( 11 B) having a rectangular cross-sectional shape, or a linear grinding member ( 11 C) having an elliptical cross-sectional shape is used. While the linear grinding member ( 11 A) is hard to bend in the diagonal directions of the cross section, the linear grinding member ( 11 B) and the linear grinding member ( 11 C) are hard to bend in directions along the long side and the major axis, respectively, of the cross section. Thus, each of the linear grinding members ( 11 A to 11 C) has an edge effect and provides high grading performance.

1 . A linear grinding member comprising a composite yarn including inorganic filaments that has been stiffened with a resin binder, wherein
 the linear grinding member has a square, rectangular, or elliptical cross-sectional shape.   
     
     
         2 . The linear grinding member according to  claim 1 , wherein
 the linear grinding member has a rectangular or elliptical cross-sectional shape an aspect ratio of which is in a range of 1.1 to 5.0.   
     
     
         3 . The linear grinding member according to  claim 1 , wherein
 the composite yarn has been twisted.   
     
     
         4 . The linear grinding member according to  claim 3 , wherein
 the linear grinding member has a square cross-sectional shape, and   a length dimension of the linear grinding member corresponding to one turn of twisting is set in a range of 1 cm to 4 cm.   
     
     
         5 . The linear grinding member according to  claim 3 , wherein
 the linear grinding member has a rectangular or elliptical cross-sectional shape, and   a length dimension of the linear grinding member corresponding to one turn of twisting is set in a range of 1 cm to 4 cm if the aspect ratio is in a range of 1.1 to 1.9, and is set in a range of 10 cm to 20 cm if the aspect ratio is in a range of 2.0 to 5.0.   
     
     
         6 . A brush-like grinding stone comprising:
 a plurality of linear grinding members; and   a holder that holds the plurality of linear grinding members in the form of bundles, wherein   each of the linear grinding members is obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments, and   each of the linear grinding members has a square, rectangular, or elliptical cross-sectional shape.   
     
     
         7 . A method for manufacturing a linear grinding member obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments, the method comprising:
 an impregnation step of impregnating the composite yarn with an uncured resin binder;   a shaping step of passing the composite yarn impregnated with the resin binder through a die to shape a cross-sectional shape of the composite yarn into a square, rectangle, or ellipse; and   a resin-curing step of curing the resin binder after the shaping step or in parallel with the shaping step.   
     
     
         8 . The method for manufacturing a linear grinding member according to  claim 7 , further comprising
 a twisting step of twisting the composite yarn before the impregnation step.   
     
     
         9 . A method for manufacturing a linear grinding member obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments, the method comprising:
 an impregnation step of impregnating the composite yarn with an uncured resin binder;   a resin-curing step of curing the resin binder; and   a polishing shaping step of polishing an outer circumferential surface of the composite yarn to shape a cross-sectional shape of the composite yarn into a square, rectangle, or ellipse.