GB946908A - Improvements in or relating to trueing devices for splined shaft grinding machines - Google Patents

Abstract

946,908. Dressing grinding wheels. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. Aug. 16, 1962 [Sept. 2, 1961], No. 31499/62. Heading B3D. The grinding wheel of a machine for splinegrinding is dressed by a device comprising a guide member pivotable through the spline angle and a diamond holder displaceable on the guide member in a radial direction parallel to the spline flanks wherein the same diamond is used for trueing the " base " curvature and the flanks of the wheel and is mounted so as to rotate and pivot respectively about two parallel axes spaced apart by a distance of R - b/2, (R being the " base " or bottom curvature radius and b the width of the splines), the trueing device and the tailstock of the grinding machine beng so disposed on a common base that the centre of the " base " trueing arc lies on the extension of the tailstock centre axis, whereby the flanks of the wheel and the " base " curvature can be trued in one operation centered on the longitudinal axis of the workpiece. Fig. 1 shows the sequence of operations of a diamond holder 102 for trueing the peripheral surface 2 and coned edge surfaces 3, 4 of a grinding wheel 1 for grinding the cylindrical and end surfaces of a spline; the successive positions of the holder 102 are shown by the numerals I, II, III, IV and V, the holder being swung through 90 degrees of positions II and IV for the correct positioning of the diamond 101. A somewhat similar sequence is employed for trueing two grinding wheels used in a spline grinding operation, each of the wheels thus having only one coned edge. The operating mechanism of the trueing tools is shown in Fig. 4, whilst Figs. 7 and 8 show a tool in positions II and III of Fig. 1 at the extremes of wheel-flank dressing movements. Rough and fine diamond tools 101, 101a, Fig. 3, are provided on a holder 102 for rough and fine trueing respectively, the complete unit being axially movable on a slide 140 between stops 138, 139 to bring the tools successively into the plane of the wheel. The cam-plate 115 is rotatable on a shaft 118 carried within a sleeve 119 in a support 120 capable of radial displacement by an adjusting spindle 123 whereby the radius R, Fig. 1, relative to the axis H is determined. The movements of the levers 111, 112, Fig. 4, are effected by the rotation of a plate 105 having shoulders 106, 107 which, striking a stop 108 in the plate 129 to which the tool-holder 102 is secured, permit a 90 degree rotation of the diamond to either side of the vertical. A spring-loaded plunger 117 maintains pressure on the rollers 116, 116a to hold them in alignment. A hand lever 135 is connected to a gear-wheel 133 which meshes with a pinion 132 on the end of the shaft 118 through which the device is operated.