| 摘要 |
<p>1471380 Shearing HATEBUR UMFORMMASCHINEN AG 3 May 1974 [5 May 1973] 19620/74 Heading B3W A device for shearing rod sections in a multistage press comprises a reciprocable cutter carriage 11, the working stroke of which is transverse to the feed direction of the rod, an impact carriage 18 coaxial with the cutter carriage, a reciprocable drive means 25 rigidly coupled to the carriage 18 and having a stroke which enables the carriage 18 to stike the carriage 11 and cause shearing during the final portion of the stroke an element 30 coupling the carriages and rigidly connected to one carriage, as shown the carriage 11, and connected to the other carriage so that the rod is moved with that carriage over only part of its stroke, and a braking device for acting on the carriage 11 or the coupling rod to stop relative movement between the carriages in both directions. The carriage 18 is driven by a lever 20 rocked by the engagement of cam faces 19a, 19b with followers 23a, 23b on arms 23, 24. The cam disc 19 is geared to the press crank-shaft. A piston 37 mounted on the rod 30 is disposed with clearance 47 in an hydraulic cylinder 28a formed by the interior of the carriage constitutes the braking device. In operation, rod (8), Fig. 2, not shown, is fed by rollers (9) through a bore 10 in the carriage 11 to a gauging stop (17). As the carriage 18 is moved to the right it first closes the gap "a" and hits the carriage 11 to cause shearing when it reaches its maximum speed. A stop 44 on the carriage 11 moves between faces 51 and 49 of a groove 45, the braking action of the fluid flow past the piston 37 damping the impact of the stop. An ejector (16) aligned with the bore in carriage 11 at the end of the shearing stroke, i.e. at 15, pushes the cut section (13) into the first gripper pair 4a on a reciprocable carriage 7 which feeds the rod to first dies (1a), 3a. The return stroke of the carriage 11 is similarly damped. The hydraulic cylinder 28a is surrounded by a helical cooling water passage 39. The piston 37 may have one or more through bores instead of the gap 47. In an alternative embodiment, Fig. 6 (not shown), the piston 37 operates in a cylinder (58) fixed to the press. In a further alternative, Figs. 7 and 8 (not shown), the piston and cylinder device is replaced by brake shoes (63) acting directly on the carriage 11.</p> |
