GB754999A - Improvements in grinding wheel manufacture - Google Patents

Abstract

754,999. Securing grinding-wheels on shafts. UNITED STATES RUBBER CO. Oct. 29, 1954 [Dec. 15, 1953], No. 31271/54. Class 80(2) [Also in Groups XXIII and XXV] A grinding wheel 2, formed of a cured mixture of abrasive grains and a curable organic plastic binder, has a plastic-containing liner 1 tightly bonded to the wheel by curing the mixture while the liner is in position and a metallic insert 3 having a hollow cylindrical portion 4 with a roughened exterior tightly held within the liner by frictional engagement therewith. The insert 3 has one end tapered at 5 to facilitate introduction of the insert into the liner 1; the diameter at the extreme end 6 of the tapered portion is preferably slightly less than the inside diameter of the liner 1. The insert 3 may have an integral flange portion 7 which engages the side face of the wheel directly or through an annular disc 8 of yielding or compressible paper, e.g. blotting paper. The bore of the insert 3 is threaded at 10 to engage a threaded drive shaft, or may be smooth and the insert retained on the shaft by a nut. The flange 7 may be polygonal or may be round and slotted to receive a wrench. The bond for the wheel may be a vulcanizable rubber, a thermosetting resin or a rubber-resin blend. The liner 1 may be made by impregnating a base material such as paper with a synthetic varnish containing "A" or "B" stage thermosetting phenolic resin, wrapping the impregnated sheet around a mandrel to desired inside and outside diameter, effecting conversion of the resin to "C" stage by heat and pressure, and cutting the tube to desired length. The insert 3 is one of a range all having the same outside diameter but different internal diameters, and the wheel 2 is one of a range have different thickness, outside diameter, grain structure &c. but all having the same internal diameter of liner 1.