GB987949A - Improvements in or relating to automatic machine tools for machining fittings - Google Patents

Abstract

987,949. Machine tool details. USTAV PRE ROZVOJ STROJARENSKEHO SPOTREBNEHO TOVARU. June 18, 1963 [June 20, 1962], No. 24246/63. Heading B3C. An automatic machine tool comprises a drum 7, hydraulic self-centring chucking devices 8, a workpiece inserting device 15, drilling and screwing heads 9-14, and work conveying means 16, the chucking devices being disposed on the drum along its axis in two rows, and staggered relative to one another. The machine has a bed 1, 2, Figs. 1-4, vertical columns 3, frames 5, 6, the indexable work carrying drum 7 having the work gripping devices 8, four spindle drill heads 9-11, four spindle screwthread cutting heads 12-14, the work-inserting device 15, and the work conveyer 16. Devices 8, Figs. 7, 8, 15, are mounted on drum 7 in two rows, and each of the devices comprises a pair of jaws 47, 51 slidably carried on a base 53, and actuated by a fluid pressure piston 63, and a pair of bell-crank levers 60, the jaws having replaceable linings 50, 75, 72, and 49, 76, 71. Drum 7 is rotatably carried by frames 5, 6, Fig. 7, and is indexed by a wheel 42 driven by means 41. A ring 30 has a groove 31 filled with Novoplast or like pressure medium, a piston 26 engages the groove and pistons 29 co-operate with the Novoplast to move the drum against a flange 38, thus clamping the drum. Chucking devices 8 are operated by a rotary valve 35 which can be moved from the position of Fig. 8, to the position of Fig. 10, by a piston 67. A frame 83 of work-inserting device 15, Figs. 16- 20, is movably mounted on piston-rods 78 secured to frames 5, 6, and a bracket 79. Abutments 92 are carried by brackets 79, and two pairs of jaws 80, Fig. 19, and a work-holding basket 86, are secured to frame 83. In operation, the chucking devices in positions 21-23, Fig. 4, hold workpieces, and drilling and screwing heads 9-14 operate on the work. When the operations are completed the heads are retracted, a signal is transmitted to driving device 41, and drum 7 is indexed to bring newly inserted workpieces from position 21 to position 22, and to unload workpieces from position 24. Valve 35 is simultaneously actuated to open devices 8 in position 24 to release the workpieces on to conveyer 76, which conveys them to pallets 20. Pistons 29 lock drum 7, and the operations by the heads are restarted. Frame 83 is moved towards the drum, and into the position of Fig. 17, where workpieces held in jaws 80 are introduced into the open chucking devices in position 21. Valve 35 is actuated to clamp the workpieces at position 21, frame 83 is retracted, and stops 92 move the next workpieces into the jaws of device 15.