| 摘要 |
1,111,032. Boring bar. COMMISSARIAT A L'ENERGIE ATOMIQUE. 2 Aug., 1966 [16 Aug., 1965], No. 34670/66. Heading B3C. A boring bar for making grooves in a deep bore in a rotatable workpiece comprises a laterally deformable beam 1, Figs. 1-3 fixable to a tool turret at one end 2, a part 3 fixed to the beam at the other end, a part 6 radially slidable relative to part 3, parts 3 and 6 having guiding rollers 5, and 9, 10 respectively, and a cutting tool 4 carried by part 3. Part 6 has guide rods 7 which are slidable in bores 8 in part 3, and an eccentric pin 12 fixed to a transmission bar 13, co-operates with a slot 11 in part 6, so that when an hexagonal end 15 of bar 13 is rotated, part 6 is moved radially, rollers 9, 10 engage the bore 23 of workpiece 25, beam 1 bends until roller 5 engages the bore, the workpiece is rotated, and tool 4 cuts a groove of depth A. In a modification, the fixed and movable parts 26, 29, Fig. 5, have locating pads 27, 30, 31, part 29 being movable radially by an eccentric 32 operated by a pawl and ratchet mechanism. Tool 41 is carried on a plate 43 secured to a shaft which can be rotated so that the tool can have a progressively increasing depth of cut. In a further modification, tool 41 is carried on a plate (48), Fig. 8 (not shown), which is radially movable, guided by pins (49), due to the action of an eccentric (52). |
