GB1302114A - - Google Patents

Abstract

1302114 Grinding HEALD MACHINE CO 9 April 1970 [25 June 1969] 16942/70 Heading B3D A machine, e.g. for grinding the outer race 16 of a bearing comprises a base 11, a workhead 12 for rotating the workpiece 16, a wheelhead 33 supporting a profiled grinding-wheel 35; first means 49 for causing axial relative movement of the wheel 35 and workpiece 16, second means 37 for imparting relative movement perpendicular to their axes, and control means 46 for operating the first and second means simultaneously. At the start of a grinding cycle, an hydraulic piston/cylinder unit 58 advances a workhead table 13 on ways 14 so that the wheel 35 enters the bore to be ground. A grinding- wheel cross-slide 25 is then moved by a further piston/cylinder unit 32 so that the wheel 35 engages the workpiece, and the workpiece is advanced by means of a stepping motor 49 linked to the piston-rod 57 of the unit 58, leading to rough grinding, impingement of an adjustable finger 27 on the slide 25 against a stop 28 on a compensation slide 26 limiting the infeed. For finish grinding, the motor 49 and a further stepping motor 37 geared to the slide 26 are actuated in synchronism, retraction of the slide 26 allowing further infeed under the action of the unit 32 accompanied by corresponding advance of the table 13. A pneumatic gauge 18 governs the final bore diameter, and also indicates necessity for wheel dressing by means of a diamond truing device 17, the control means 46 actuating the motors 37, 49 during truing to cause compensating movements of the slides 26, 13. The finger 27 and stop 28 constitute an electric switch which may position the gauge 18.