GB837942A - Surface treating apparatus for grinding wheels or the like - Google Patents

Abstract

837,942. Dressing grinding wheels. SHEFFIELD CORPORATION. Sept. 15, 1958 [Nov. 13, 1957], No. 29446/58. Class 60. An apparatus for removing work material from between the abrasive grains of a grinding wheel 10 or the like comprises supply means 40 for flooding at least a portion of the wheel surface with liquid, and a member 20 which is disposed in closely spaced relation to the wheel surface and reciprocated by a driver unit 30 at high frequency and minute amplitude so as to cause cavitation of the liquid between the wheel surface and member for removal of work material from the wheel surface. As shown applied to a machine for grinding cylindrical workpiece, the member 20, which is arcuately and transversely shaped to the profile of the wheel as formed by a crushing roller 13 operated by a handwheel 17, as connected by a body 32 to the drive unit in the form of an ultrasonic magnetostrictive transducer 30 in a housing 22. The transducer is excited by electrical energy from a connection 37 and cooled by liquid supplied through conduits 34, 35. The housing is clamped to a slide which is adjustable by a rack-an-pinion controlled by a handwheel 24, and a screw-nut controlled by a handwheel 26 for coarse and fine adjustment, respectively, on a bracket 16. The member 20 is adjusted to within a few thousandths of an inch of the surface of the wheel which, during operation on the workpiece, accumulates particles of material between its abrasive grains. Liquid is supplied to a pipe 40 which surrounds the member 20 and has orifices 41, Fig. 3, which direct the liquid to the space between the wheel surface and member 20, the latter having slots 42 to ensure flooding of the surface. The high frequency of the member 20 causes collapse of vacuous pockets formed within the liquid because of cavitation and provides energy and agitation for the removal of the work material from the wheel surface.