METHOD AND DEVICE FOR BORING Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: during a boring of a groove the bor-rod is supported by at least two supports. The boring is carried out in two stages: roughing boring and, after the complete machining of the part from outside, finishing boring. The device has bor-rod with an extension and boring head 3 that carries replaceable holders 4 for cutting tools. The holders are provided with right-cutting and left-cutting members 5,6. Mechanism for radial movement of holder 4 has worm pair whose worm wheel 7 engages worm 9 arranged inside the housing of boring head 3. One end of the housing is provided with gear wheel 10 that engages gear wheel 11 rigidly secured to shaft 12 mounted inside bor-rod 1. When worm 9 rotates holder 4 also rotates and right- cutting member 5 bores surface 13 of the groove and then cylindrical surface 38. After that head 3 moves back until left-cutting member 6 is set in operation. Left- cutting member 6 bores surface 39 of the groove. EFFECT: simplified method and device. 2 cl, 3 dwg