| 摘要 |
<p>646,933. Broaching. OILGEAR CO. Aug. 5, 1947, No. 21258. Convention date, Oct. 2, 1944. [Class 83 (iii)] A broaching machine comprises a tool carriage 5 reciprocable on longitudinal guides 3, 4 secured to the front face of a frame 1, a worktable 29 supported for rotation in a vertical plane on a sub-frame 30 which is rigidly attached to the frame I so as to form an effective part thereof, and means for indexing the table 29 through a predetermined angular distance alternately with the movements of the carriage 5. The latter is reciprocated by a hydraulic motor 6, 7 operated from a pump 10, driven by an electric motor 11, through the intermediary of a differential valve 16, the pump being controlled by solenoids C5, C7. The table 29 is connected to a shaft 33 provided with a pinion 50 which is adapted to be engaged by a rack 51 reciprocated by a hydraulic motor 53, 54. The rack 51 is moved into engagement with the pinion 50 by means of a cam 57, operated by a hydraulic motor 43, 44, which operates simultaneously a plunger 38 to unlock the work-table. The motors 43, 44 and 53, 54 are operated from a gear pump 61 through the intermediary of valves 65, 73 controlled by solenoids C1, C2, C3, C4, an electrical circuit being provided for causing the hydraulic motors to operate in a predetermined sequence. In operation, the rack 51 is first moved downward in an idle stroke, the plunger 38 is then retracted from the table 29 and at the same time the cam 57 causes the rack 51 to mesh with the pinion 50 on the table shaft. The rack is then retracted to index the table through 90 degrees and the plunger 38 is then moved to lock the table in the indexed position. The tool carriage 5 is then advanced to broach the work after which operation it initiates a second indexing cycle upon completion of which the tool carriage is retracted.</p> |
