Patent GB-1104814-A (GB)
Title: Improvements in or relating to a honing machine
IPC: B24B33/10
Filed: 1966-08-10
Abstract: 1,104,814. Honing. MICROMATIC HONE CORPORATION. 10 Aug., 1966 [20 Sept., 1965], No. 35761/66. Heading B3D. A honing machine comprises: (1) an upright support, (2) a rotatable and reciprocatable spindle mounted in the support, (3) a drive-shaft connected to the spindle, (4) a honing tool having an upper portion extending within a portion of the drive shaft and a lower portion extending below the drive shaft, (5) honing stones mounted on the said lower portion, and (6) means interposed between the drive shaft and the honing tool whereby the tool is movable laterally to accommodate eccentric rotation. A honing machine (Fig. 1) has a base (10). A workpiece (16), e.g. a brake drum, is supported on fixtures (18) on a fixture frame (14) supported on the base (10). An upright frame (12) secured to the base (10) carries an hydraulic cylinder (20) in which a piston (22) is reciprocated, a lower spindle bearing (24) being connected to the lower end of the piston. A spindle shaft (26) extending through the cylinder is rotated through belt and pulley means (28) by a motor and carries at its lower end an adapter flange (30). A drive shaft assembly 42, Fig. 2, comprises an adapter flange 44 adapted to be connected to the adapter flange (30), a tubular shaft 46 and an adapter 48, the latter being connected by screws 52 to a body housing 54. A tubular body 70 has a reduced diameter portion 72 extending within the drive shaft assembly 42. The body 70 is retained by a ring 196 secured by screws 198 to the body housing 54. A bronze ring 184, Fig. 6, has diametrically opposed slots 186 on one face and diametrically opposed slots 188 on the opposite face. A key 190 is disposed in each slot. Pins 192 project from the upper keys into bores in the body housing 54 and other pins 192 project from the lower keys into bores 194 of the body 70; the body 70 can thus shift laterally of the drive shaft assembly. Bores 200 in the ring 184 each receive a ball 202 to assist the lateral shifting. Coolant and swarf drain through radial slots 204, 206 in the ring 184 and leave through slots 208. A member 166 secured by screws 178 to the body 70, with an interposed drive key 180, has radial recesses receiving stone holders 162 in each of which a stone 168 is removably held by a clamp plate 170. The stones are retracted by a spring 174. Bronze guides 176 for guiding the tool into and out of the workpiece W are detachably secured to the member 166 by screws 177. A piston 76 in the portion 72 of the body 70 is connected by a push rod 80 to an expander 94. Bell crank levers 148 are pivoted about pins 150 mounted in the body 70. One portion 152 of each lever 148 is held in a recess 154 of the skirt 99 of the expander 94 by an end plate 156 secured to the bottom of the expander by screws 158; a portion 160 of the lever contacts the inner end of a stone holder 162. Downward movement of the piston 76 to expand the stones 168 is effected by fluid admitted through coupling 246. Upward movement of the piston is effected by fluid admitted through coupling 248 and flowing via a recess 254 and recesses 256 in the piston. A bore 100 extends diametrically through the closed top end 74 of the portion 72 of the body 70 and connects with a bore 102 leading to an outlet port controlled by a rod 106 resting on the expander 94. Air is supplied to the bore 100 through a filter 114, a pressure regulator 118, a flow controller 120 and a pneumatic coupling 112. The air pressure operates a normally open pressure responsive switch 138, 140. As the stones wear, the rod 106 descends. When the outlet port 144 is uncovered the switch closes due to the drop in pressure; relay 142 is energized, opening contacts 143 to de-energize the motor relay M to discontinue honing; relay 128 is energized, closing contacts 129 to energize a light R to indicate that the stones need replacing. A tubular member 218 encircling the lower portion of the push rod 80 is screwed into a locator arbor 230 which is advanced by a spring 238 to an extent limited by engagement of a cushion 226 at the top end of the member 218 with a bushing 212 secured to the lower end of the push rod 80. As the honing tool is lowered into the workpiece W the arbor 230 extends through the central opening of the workpiece until the bearing surface 250 contacts the corresponding surface on the arbor 230. Withdrawal of the arbor is prevented by an element located in the fixture frame 14 engaging the portion 244 of the arbor.