GB634395A - Improvements in or relating to profile generating machines - Google Patents

Abstract

634,395. Grinding turbine-blades and the like. FAIREY AVIATION CO., Ltd., and LYON, G. April 21, 1947, No. 10577. Addition to 633,550. [Class 60] [Also in Group XXII] The machine of the parent Specification is modified by mounting the work on the opposing faces of face-plates arranged to be swung about an axis, the inclination of which to the direction of length of the work is adjustable. The tracer k, Fig. 1, which may be a ball-ended stylus, is supported by a member 34 slidable along an arm m pivoted about the axis n, n and carrying the tool driven by a motor 38. A carriage 48 traversed by a lead screw 50 driven by suitable transmission mechanism from a motor 100 pivotally supports the arm. The master form a is mounted on an arrangement of slides which allows it to be adjusted in two mutually perpendicular directions on a carriage z reciprocated by a crank disc and crosshead mechanism driven from the motor 100 through shafts 102 and 19. The slide on which the master form is mounted is fed intermittently in the direction of the length of the master form by a lead screw driven through a gear train by a ratchet wheel 26 which strikes a pawl 27 secured to the base 29 of the machine as the carriage z reciprocates. To prevent lateral deflection of the arm m its free end is accommodated in a forked member 30 traversed by a lead screw driven through shafts 33 and 103 from the motor 100. The work e is supported in a trough-shaped member 39 mounted on trunnions between the opposing faces of a U-shaped member 45, Fig. 7. One trunnion is free to turn in a ball 42 mounted in a bearing block 43 which is adjustable on one face of the member 45 while the other trunnion 41 is mounted in a bearing 58 free to move about an axis 59, 59, Fig. 18, on pintles 60, 60 carried in the limbs of a forked block 61 adjustable on a face plate 62. The member 45 is supported by trunnions 51, 52 on a table 55 the inclination of which may be varied by the mechanism shown in Fig. 14. In this mechanism, a U-shaped member 57 adjustable in the main base 29 by a lead screw 116 is provided with two slots 117 and two slots 118 through which pass the ends of shafts 119, 119 provided with pinions 120, 120 engaging racks 121, 121. One of the shafts 119 is journalled in lugs 56 forming part of the table 55 while the other shaft 119 is journalled in a slide on the bottom thereof. Both shafts are rotated through worm drives from shafts 127 and the table is secured at the desired inclination by bolts 128. To oscillate the work about the axis 46, 46 the trunnion 51 is extended to carry a freely mounted segment 64, Fig. 11, formed with an arm 69 connected to a selector valve 71 for a hydraulic cylinder 66 pivotally connected with a lever 65 which is keyed to the trunnion extension and has its piston rod 67 pivotally anchored to the table 55. Attached to the opposite ends of the arcuate surface of the segment 64 are the ends of two flexible metal bands 72, 72 the other ends of which are attached to two arms 73, 73 fixed to the ends of a carriage 75, Fig. 9, slidable horizontally in a support 76. A pin 92, Fig. 12, secured to the carriage, is slidable in half the depth of a slot 89 in a lever 90, the other half of the slot being occupied by a pin 87 secured to a carriage 86. The lever pivots about a pin 97 slidable in a slot 94 and is oscillated about this pin by the carriage 86 which is reciprocated by a crank disc and crosshead mechanism driven from a worm drive splined on a shaft 106 driven by the shaft 102. The carriage 86 is supported by a carriage slidable on a guide 77 and coupled to the carriage 48 by a link 79 the effective length of which is adjustable. To produce work twisted in form the carrier 39 has an angularly adjustable arm 132, Fig. 8, attached to it. A slot 135 in this arm is engaged by a pin 136 on a bar 138 slidable in the bifurcations 139, 140 of the bearing 58 and provided with a roller 151. A hydraulic cylinder pivotally supported between the free end of the lever 132 and an extension of the bifurcation 140 maintains the roller in contact with a cam 150 mounted on a carriage 146 slidable on a guide 145 integral with the bearing 58. This carriage is provided with a tongue 157 the opposite parallel faces of which are engaged by two rollers 160, 161, Fig. 9, secured to a carriage 164. A lead screw 112 driven from the motor 100 traverses the carriage 164 on a guide 165 thus moving the cam relatively to the roller and causing the work to rotate on its longitudinal axis through the lever 132. A gear box 101 provides the desired variety of directions and speeds of rotation of the shafts 102 and 103. Specification 606,620, [Group XXIX], is referred to.