Patent GB-1219928-A (GB)
Title: Honing machines
IPC: B24B19/06
Filed: 1968-03-06
Abstract: 1,219,928. Abrading. MICROMATIC HONE CORP. 6 March, 1968 [6 March, 1967], No. 10875/68. Heading B3D. A honing machine for operating on rotating cylindrical or frusto-conical workpiece surfaces comprises a tool mounted for reciprocation along the surface and actuated by a shaft pivotally mounted on a housing on a movable slide assembly. Workpiece rotating means comprises an electromagnetic chuck 11 (see particularly Fig. 6) including a drive plate 24 adapted to seat against one end surface 149 of a workpiece 14. The chuck is mounted on a spindle 28 carrying a pulley 57 driven by an electric motor 61. The spindle and motor are supported by a housing 43, 54, 63 mounted on the machine base 18. Lead wires 31, 32 for the chuck coil pass through the spindle 28; current is supplied through commutator rings 34, 35 and brushes (36), 37. A load shoot includes upper guide rails 66, 67 and lower guide rails 68, 69 between which a workpiece can roll (Figs. 1, 9, 10, 12). The guide rail 67 is secured by guide bars 76, 77, on which the guide rail 66 is adjustable, to a support block 70 slidably mounted on guide bars 71, 72. The guide rail 69 is secured by guide bars 78, 79, on which the guide rail 68 is adjustable, to a support block 74. The support blocks 70, 74 are moved towards or away from each other by a shaft 83 having oppositely handed screwthreaded portions; the shaft is centrally journalled on a support block 82 which carries the guide bars 71, 72. The block 82 is secured to a mounting block 86 attached to a vertical column 87. Fixed to the block 82 is an elongated slide bushing 89 having a bore 90 and a slot 91. Means for actuating workpieces down toward the chuck comprises a dog 94 slidable in the bore 90. A feed finger 96 is pivotally mounted in the front end of the dog. The dog 94 has a bore in which is slidable an actuator dog 98; a transverse pin 99 mounted in the dog 94 extends through an elongated slot 100 in the front end of the dog 98. The dog 98 is connected to the piston-rod 101 of a cylinder 102, e.g. a pneumatic cylinder, adjustable relatively to the mounting block 86 by a screw 105. When the cylinder 102 is energized to move the rod 101 to the left, Fig. 10, the dog 98 moves to the left until the pin 99 engages the rear end of the slot 100, whereupon the finger 96 is pivoted clockwise and the finger and dog 94 are moved together to urge a workpiece down the shoot. A limit switch 8LS is operated by a workpiece in the load shoot. An unload shoot, for the discharge by gravity of workpieces into a receptacle or into a work transfer means for conveying the workpieces to another machine for a succeeding operation, comprises guide rails 109, 110 (Figs. 1, 9) carried on guide bars 111, 111, the rail 109 being adjustable on the bars. The bars are fixed to a support block 112 secured to guide bars 114, 115 secured through blocks 117, 118 to the vertical column 87. The workpieces are moved from the load shoot into the working position and then to the unload shoot by an oscillating dial loader 125 (Figs. 1, 7, 9) having a work-receiving pocket 126. When the loader 125 turns clockwise to discharge a workpiece into the unload shoot a key 122, secured in a slot 124 in guide rail 110, engages the workpiece in the loader and breaks it loose so that it will roll by gravity from the pocket into the unload shoot. The loader is mounted by a plate 128 on a plate 130 having an opening 131 which exposes the chuck 11 to the rear side of the loader. The plate 130 is rotatably mounted on guide rollers 132, 133, 134 carried by a support plate 136 mounted on the base 18. A ring gear 137 secured to the plate 130 meshes with a drive gear 139 on the output shaft of a rotary fluid motor 141. The workpiece may be a cone of a tapered roller bearing having a bore 145 and an external tapered bearing surface 146 (Fig. 13) which is to be honed, bounded by lips 147, 148. A locating arbor 15, mounted on a shaft 166 carried by a compound slide assembly 16, includes a shaft 167 carrying four carbide shoes 168; the width of the shoes is greater than the pitch distance from peak to peak of the waves shown on a polar geometry chart of a workpiece profile. Fluid to form a film between the shoes and the workpiece bore is supplied by a pump through an axial bore 173 and transverse bores 174 in the arbor. When honing the internal tapered bearing surface 183 (Fig. 24) of the cup 180 of a tapered roller bearing, the arbor shaft 167a is semicircular and provided with carbide shoes 168a, the honing being done by an abrasive stone 192 in a holder 13. This may also be used for external honing. A tool holder assembly 13 comprises a tool feed cylinder 186 (Fig. 131) mounted in a tool engagement cylinder 187 mounted in a carrier 188. The cylinder 186 contains a piston 190 having a recess 191 receiving the upper end of the stone 192; the lower end of the stone slides through a bore in an adapter 209 secured to a second adapter secured in the cylinder end sleeve 211. When the stone is so worn as to need replacement, the piston 190 is in position 213 and touches a contact 214 to actuate a stone wear signal 5LS. The body 220 of the cylinder 187 slides in a sleeve 219 seated in the bore of the carrier 188. The upper end of the body 220 has a reduced outer diameter 222. A gland 223 is attached to the body 220, and a gland 233 is attached to the sleeve 219. The cylinder spaces 238, 239 are connected to ports 240, 241. A limit switch 7LS is operated by a block 229 when the cylinder 187 is in its operative position. The stone 192 is pneumatically urged against the workpiece surface 146 while the stone is being reciprocated at high speed on a path parallel to the workpiece axis. The cylinder 187 can raise the cylinder 186 to get workpieces with lips such as 147, 148 on and off the workpiece locating structure; in the upward position of the cylinder, a limit switch 6LS is actuated. To provide for angular adjustment about a horizontal axis of the tool holder assembly 13, the latter includes a housing 247 mounted on the front end of a spindle 248 (see also Figs. 14, 15) slidable in a housing 250. The housing 250 has a projection 251 to which is attached a partcircular clamp plate 252 carrying a shaft 253 pivotal in a bore in a horizontal slide 254. The housing 250 also has a shaft 255 pivotal in a wall 256 having upper mounting arms (257), (258) and a lower arm (259) secured to the slide 254. The clamp plate 252 can be clamped to the slide 254 by a clamp block (260) on a threaded shaft (261) actuated by a handle 262. A worm-wheel 266 secured to the spindle housing 250 meshes with a worm gear on a shaft 267 rotatable, in a housing 269 fixed to a bracket 270 secured to the slide 254, by a hand wheel 268. A reciprocating drive assembly 19 (Figs. 1, 14, 15) includes means for adjusting the stroke of the spindle 248. A bar 273 is fixed at a central point thereon to a block 274 fixed to the rear end 275 of the spindle 248. A bar 276 has its front end pivotally mounted by a shaft 277 in a journal 278 fixed to a bracket 279 secured to the spindle housing 250. The bars 273, 276 are connected by a link 280 having holes 281 for securing the link to the bars in various relationships. One end of the link 280 is connected to the bar 276 by a screw 282 having a T-head 283 slidable in a T-slot 284 in the bar 276; the head 283 is engaged by an adjusting screw 285 having a nut-shaped head 289. The screw 290 connecting the other end of the link 280 to the bar 273 is similarly adjustable by a screw 291. A lever 300 connected to the bar 276 adjacent the pivot shaft 277 carries a roller 301 following the cam track of a cam 303 driven, through a reducer 305, by an electric motor 306 mounted on the spindle housing 250. The cam may have 2À5 ins. maximum rise and 1À5 ins. minimum rise with a 10 degrees dwell on each side of centre on each end of stroke, providing a 20 degrees total dwell, whereby more stock is removed nearer the ends. The horizontal slide 254 is mounted on flat ways 310, 311 (Figs. 1, 2) on a vertical slide 312 and is movable forwardly and backwardly by an air cylinder 313 mounted on the vertical slide. The slide 254 carries actuators (321), (322) (Fig. 4, not shown), for operating limit switches 3LS, 4LS controlling the cylinder 313. The slide 254 can be clamped to the vertical slide 312 by a block 327 operated by a screw 326 with a crank 325. The vertical slide 312 is mounted on flat ways 328, 329 on a column 17 and is moved upwardly and downwardly by a screw 333 operated, through worm gearing 335, by a hand wheel 337. The housing 18 (Fig. 1) includes a trough 342 to catch coolant. Automatic cycle.-Operation of start, switch (354) (Fig. 17, not shown), energizes coolant pump motor (175) and magnetic separator (360) and prepares control circuit. Cycle start switch (369) is operated, lighting lamp (371) and causing admission of pressure air to the loader motor 141 and load shoot cylinder 102. When the loader 125 is in hone position, limit switch 2LS causes admission of pressure air to slide cylinder 313 to advance horizontal slide 254 locating arbor 15 within the workpiece. Limit switch 4LS is operated to admit pressure air to tool feed cylinder 186. Pressure air is admitted to tool engagement cylinder 187 to bring the tool into engagement with the workpiece. The magnetic chuck is then energized. Spindle motor 61 and reciprocation motor 306 are energized. The tool assembly is reciprocated quickly until fast reciprocation timer times out and then slowly until slow reciprocation timer times out. Spindle motor 61 and reciprocation motor 306 are stopped. The chuck is demagnetized. Slide 254 is retracted and motor 141 energized to unload the workpiece. Another cycle is started.