Patent GB-972224-A (GB)
IPC: B24B53/053
Filed: 1963-09-19
Abstract: 972,224. Securing grinding discs on shafts. NORTON CO. Sept. 19, 1963 [Sept. 19, 1962], No. 36891/63. Heading F2U. [Also in Division B3] Apparatus for making spindle-supported grinding points comprises a support adapted to hold a point containing a hole at one end which has previously been filled with an activatable binder with the hole uppermost, a dressing wheel, a support adapted to hold a spindle above the point support and to be moved therefrom to a position adjacent the dressing wheel, said point support being movable up to the spindle support to embed the lower end of a spindle held in the spindle support in a point held in the point support and containing induction heating means for activating the binder, and control means operable to raise the point support to engage a point held therein with a spindle held in the spindle support, hold the point and spindle engaged for a predetermined length of time and then lower the point support, energize the induction heating means during the time the point and spindle are held engaged and following lowering of the point support move the spindle support to said position adjacent the dressing wheel preparatory to dressing. Filling station FS.-A support 62 holds a point upright with its open end uppermost beneath a crosshead 64 vertically movable on rods 66, 66 by an hydraulic cylinder 70 controlled by a solenoid-operated valve S7. The crosshead carries a container 72 for powdered binder having in its bottom an orifice surrounded by a gasket. With the crosshead lowered to register the orifice with the hole in the point, vacuum, under the control of a solenoid-operated valve G, draws binder into the hole. Vertical movement of the crosshead operates limit switches LS5, LS6. Lending station LS.-A support 30 has an opening 38 within which a point may be seated, with its filled hole uppermost. The support also includes an induction heater H and is vertically movable by an hydraulic cylinder 36 controlled by solenoid-operated valves S13, S13b. Vertical movement of the support operates limit switches LS1, LS7. Transfer device TD.-A headblock 14 is mounted on a shaft 12 rotated by a reversible hydraulic motor 13 under the control of a valve V2 operated by solenoids S9, S10. The headblock carries two spindle supports 16 and two motor supports 17. The spindle supports carry hollow shafts 19 belt driven by motors 22, and have at their lower ends chucks 20 opened and closed by air supplied through lines 28 and the shafts 19 under the control of solenoid-operated valves S2, S4. A shaft 63 driven by the motor 13 carries cams 59, 61 actuating limit switches LS4, LS8. Dressing station DS, including binder flash removing apparatus BR.-A dressing wheel 32 is rotated by a motor 42, and is vertically reciprocated by an hydraulic cylinder 48 controlled by a valve V1 actuated by a motor-driven cam. The wheel slide 43 is connected by a pivoted arm 44 to an hydraulic cylinder 47 controlled by a solenoid-operated valve S12 so as to advance and retract the slide. The pivot of the arm 44 is carried by a member 50 adjustable by a screw 52 and hand wheel 54. The dressing wheel is surrounded by a hood 55 having an exhaust duct 57. Horizontal movement of the wheel slide 43 operates limit switches LS2, LS3. Turning.-An adjustable flash-removing tool assembly 33 is pivotable and yieldably mounted on an adjustable member 35 supported by a lever 37 advanced through a spring 51 and positively retracted by an hydraulic cylinder 41 controlled by the solenoid-actuated valve S12. The tool is spring urged clockwise towards a stop screw, so that as it advances it removes flash without digging into the point surface. Operation.-A filled point is taken from support 62 and placed on support 30, and replaced by an unfilled point. Footswitch FSW is depressed, opening the chuck which is at the loading station and initiating the vacuum filling. A spindle is placed in the chuck, and the footswitch FSW released, closing the chuck on the spindle; the vacuum filling continues. When filling was initiated, the crosshead 64 was lowered. Thereafter suction was applied for a timed period, the crosshead 64 raised, and an air blast, controlled by a solenoid-operated valve I, is operative for a timed period to lift the point from the support 62. Filling terminates until the next operation of the switch FSW or operation of a push-button Vb. Switches 56L, 56R are now actuated. Support 30 is raised, rapidly at first and then slowly until it comes to rest with the spindle embedded in the filled hole. The induction heater operates for a timed period to activate the binder. The support 30 is then lowered. The transfer device then rotates moving the mounted point from the loading station to the dressing station, during which movement chuck rotation starts, and moving a dressed mounted point from the dressing station to the loading station, during which movement chuck rotation stops. The dressing tool and flash removing tool advance and then retract, terminating the cycle.