Patent GB-884519-A (GB)
Title: Improvements in boring machines and other machine tools
IPC: B23B31/175
Filed: 1958-12-05
Abstract: 884,519. Boring machines. KEARNEY & TRECKER CORPORATION. Dec. 5, 1958 [Feb. 6, 1958] No. 39255/58. Class 83 (3). A boring machine, particularly adapted for boring the hubs of railway wheels, has the latter supplied to the machine in a loading station and then the wheels are automatically moved to a work position and again automatically moved out of the work station as another wheel is moved in. One embodiment of the invention comprises a boring head 37, Fig. 1, with a cutter bar 39 rotated by an electric motor 42 all mounted on a base 15 to face a slidable work-holding head 18. The latter is moved by a fluid-pressure cylinder 27 but in a second embodiment the boring head is moved and the work-holding head remains stationary during cutting. The boring-bar has two sets of cutters 45, 46, the second set being adapted to cut a layer diameter hole when heavier wheels are operated upon. A frame 50, 51, 55, 56, 62, 63, Fig. 4, is secured to the base transversely of guideways 24, 25, for the work-holding head and adapted to function as a work-feeding and removal device. The workpieces are rolled from outside the machine into the frame where they are supported between upper and lower rails 48, 47, respectively. One wheel W2 is shown ready for feed into the machine head while another wheel W1 is being operated on. The wheels can be rolled along to the right, Fig. 4, by transfer mechanism comprising rollers 149, 149a, 149b, carried on arms keyed to a shaft 130. This shaft is moved axially by a fluid-pressure cylinder 164 carried on the top of the frame and a rotary fluid motor 174 is adapted to rotate the shaft 130 and rollers to an out-of-the-way position, Fig. 5, during retraction of the transfer device. Fences 64, 65, Fig. 4, maintain the wheels in an upright position either side of the working position, but, in the latter a beam 73 with a boss 71 is pressed against the wheel hub by a weight 90, Fig. 1, and cables 91 connected to rods 74 to which the beam is secured. The centre wheel is thus in position for being gripped by the work-holding member 192, Fig. 3. The slideable head 18 carries three radially movable jaws such as 207 moved by arms 216 pivoted at 217 with their longer lever parts spring-pressed against a conical sleeve member 224. The latter is moved by a fluid-pressure cylinder 245 when the jaws 208 are in position to grip a wheel. The wheel is lifted slightly from the lower track 47 and is then moved forward sufficiently for the desired set of boring cutters to bore out the wheel hub. Operation. All operations are performed automatically after pressing switch button 363 or 364, one controlling the smaller diameter bore and the other the larger diameter. Electric circuits and solenoids control valves in fluidcircuitry to obtain the required sequence of operations. Lubricating and cooling; cuttings catching &c. Coolant for the tool is supplied through a delivery pipe 266, Fig. 3, and passes via the space 262 to a discharge pipe 271 adjacent the work. The cuttings pass down a bore 278, 279, provided in the head 18.