GB569082A - Improvements in or relating to machines for grinding tooth flanks of gear wheels by means of profiled abrasive discs - Google Patents

Abstract

569,082. Grinding. AEPPLI, A. June 23, 1943, No. 10156. Convention date, June 18, 1942. [Class 60] [Also in Group XXII] A machine for grinding gears by means of discs having the shape of the tooth flanks has two discs 19 for acting on opposite flanks of a gear 6, one at least of the discs being angularly adjustable about the axis of the gear. The work 6 is mounted between a headstock and tailstock on a vertical slide 3 which is reciprocated on a pillar 2 by mechanical or hydraulic mechanism. Each disc 19 is carried by a spindle driven by an electric motor 23 and mounted in a bearing 22 on a slide 11 movable by a screw 12 on a base 8 pivotally mounted on the frame of the machine about the axis of the work and angularly adjustable by an arcuate rack 9 and pinion 10. After each traverse or reciprocation of the slide 3 the work is indexed and the depth of cut may be adjusted by rotating the work and one of the bases 8, but preferably by maintaining the work stationary and rotating both of the bases 8. The operative face of each disc 19 is trued by a diamond 15 on a pivoted holder which is given a rolling motion relatively to a slide 13 so as to generate an involute surface, the slide 13 being adjusted radially on the slide 11 by a screw. The screw 12 is rotated by hand at 7 to adjust the disc 19 to suit the diameter of the work and the screw may be coupled to the screw 12 by gearing 17, 18 such that the trueing slide 13 will be traversed through twice the distance moved by the slide 11 to compensate for the reduction in diameter of the disc due to trueing. The rolling motion of the trueing diamond may be effected automatically or by hand and one trueing device only may be mounted on the slide 3 to roll about the axis of the work, the device being rotated through 150 degrees for operating on each of the discs 19 in turn. Instead of reciprocating the slide 3, this slide may be stationary with the axis of the work vertical or horizontal and the reciprocation along the work axis given to the discs 19, and the work and grinding discs may have inclined axes for producing helical gears. Specification 569,081 is referred to.