GB822058A - Grinding wheel - Google Patents

Abstract

822,058. Grinding wheels. SUPER-CUT Inc. Nov. 1, 1956, No. 33416/56. Class 60. A grinding wheel for grinding a flat piece of glass, marble, etc., comprises a plurality of concentrically-arranged annular members 9, 10, 11, Figs. 1 and 4, secured to the outer face of a disc-like body 8 and provided with abrasive facings 24, 37, 43 which have their peripheral edges shaped so that the facings are of progressively-increasing radial width from their outer to their inner faces ; the outer faces of the facings of respective annular members are arranged in steps with the face of the outermost facing 9 nearest to the body 8. The body 8 is made of metal and formed with annular ribs providing grooves 19 for the reception of the annular members 9, 10, 11 which are of steel, brass, bronze, &c. and each constituted by a series of spaced arcuate segments. The abrasive facing 24, 32, 42 on each segment consists of a matrix with embedded diamond or other abrasive particles soldered or otherwise fixed to the segment; the mesh of the abrasive particles may be the same or be of progressively decreasing size from the outer-most member 9 to the innermost member 11. The gaps between the arcuate segments of each annular member 9, 10, 11 are staggered in relation to those of the adjacent member. The operative faces of the facings may be flat, convex or rounded, and their radially outer edges are bevelled in order that they may be of progressively greater radial width from the operative faces to their bases ; the radially inner edges and the end edges of the facings may be similarly bevelled. Screws 25 engaging with the arcuate segments permit the adjustment of the axial spacing of the operative abrasive faces from the body 8, and other screws 26 are used to lock the segments in their adjusted position. Coolant of low surface tension is fed to the grinding face from grooves 45, 48, 51 in the rear face of the body 8 through inclined holes 46, 49, 52 respectively arranged so that their outlets discharge radially inwards of the annular members 9, 10, 11 ; the disposition of the grooves, holes and ribs 14, 16, 18 forming the inner walls of the grooves 19 is such as to aid the flow of coolant due to centrifugal force. The coolant also serves to clear abrasive particles and products of abrasion from the grinding faces. The thickness of the abrasive facings is arranged to be at least as great as the respective grinding depths. Instead of providing the wheel with three annular rings 9, 10, 11 it may have two such members or more than three.