| 摘要 |
1,141,481. Making tube reducing rolls; electro erosion. INDUSTRIAL TOOL ENG. CO. 16 Feb., 1966 [13 Sept., 1965], No. 6858/66. Headings B3A and B3V. A roll such as 42 for reducing tubes has tapered grooves 32 formed thereon by electroerosion using tapered electrodes 81. Two similar rolls 42, 43 supported on rollers (47), Fig. 8 (not shown) and located axially by end stops (53), (54), Fig. 7 (not shown), have each three pre-formed grooves eroded simultaneously by parallel electrodes 81, Fig. 9 (not shown). The electrodes are each mounted between a lower pin 77 and an upper adjustable pin 76, the pins being supported on arms 75, 74 connected by columns 65, (66) to form a vertical movable carriage. This carriage is moved vertically by an hydraulic jack (60), Fig. 10 (not shown). A vertical rack 82 on arm 72 drives a pinion (85), Fig. 8 (not shown) meshing with gears (87), (88) on the rolls 43, 42 whereby the latter are rotated to correspond with the movement of the electrodes. The gears (87), (88) are removably secured to the rolls by split clamping rings (90), Fig. 12 (not shown). Movement of the carriage may be arrested by a cable (116), Fig. 14 (not shown) wrapped around column 65 and which can be tensioned by an eccentric (128) operated by a handle (127). The electrodes operate in an oil bath 99, the ends 101 of which have openings 102 with oil seals 103 enveloping the rolls. The latter are made from forged steel and after machining parallel grooves (32), Fig. 3 (not shown) and keyways (38), the rolls are heat treated before the grooves are tapered by the electro-erosion process. |
