GB949936A - Improvements in or relating to apparatus for the dressing of profile grinding wheels - Google Patents

Abstract

949,936. Grinding. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. June 30, 1960 [June 30, 1959], No. 22940/60. Heading B3D. A dressing device for simultaneously dressing two involute surfaces of a wheel 55 for grinding teeth flanks of gears, the device being adjustable for gears of different base circle diameters, has two pairs of generating arcuate members 1, 2, 3, 4 and two rolling plates 8, 9 engaging the members, each plate fixedly carrying a slideway 35 in which a slide 36 is adjustable in a direction at right angles to the plate, and a separate guide rod 37 mounted in each slide, one end of each rod having a diamond holder 38, 39 and the other end of each rod being guided along members 43 pivotally connected to the rolling plates and guided in bushes 45 at the ends of control rods 44 pivotable about the common centre 5 of the generating members 1, 2, 3, 4. The plates 8, 9 are maintained in rolling engagement with the arcuate members by tapes 15, 16, 17, 18 which are connected to the plates and o fixing points 49, 50. Rolling of the plates about the arcuate members is effected by hydraulic or pneumatic units 23, 24, 25, 26 connected by tapes 19, 20, 21, 22, guided over rollers 27, 28, 29, 30, to the ends of support members 11, 12 secured to the plates. The slides 36 are adjustable along the slideways 35 to adjust the device for dressing the profile of the grinding wheel to a desired base circle diameter. Each plate has a slideway 35 and slide 36 at the front and back of the device, and the guide rods 37 of the associated pairs of slides are interconnected by braces 40, the forward ends of which carry the diamond holders 38, 39. The braces can be adjusted relative to each other to accommodate the helix angle # of the gear for which the grinding wheel is being dressed. The control rods 44, which are pivotable about the axis 5 of the generating members 1, 2, 3, 4 and slidably receive the rods 43 in bushes 45, maintain parallelism between the guide rods 37 and plates 8, 9 during a dressing operation. The generating members are adjustable about the axis 5 by screw-and-nut mechanisms 33, 34 engaging slotted lugs 46 on the members to accommodate the breadth of the tooth on the gear to be ground; the adjustment may result in a separation of the diamonds such that the flanks of teeth 58, 60 are ground while an intermediate tooth 59 is in a recess 57 in the grinding wheel. Alternatively, two grinding wheels may be used having a gap therebetween and fixed together by spacing means. Stops 31, 32 on the generating members 1, 2, 3, 4 are contacted by the opposed inner edges of the plates 8, 9 when the plates reach limiting positions.