| 摘要 |
A machine tool (10) utilizing two speed hydraulic indexing with direction control valves (86,88) which are energized to stop. A turret (12) is rotated during indexing by a hydraulic motor (36). An open loop control system is utilized to locate the turret (12) position before clamping. A plurality of cams (40,42,44,46,48,50) which trigger associated proximity switches (41,43,45,47,49,51) are used to provide control information to the electric control circuit (17) for turret indexing. A final position cam (50) which rotates at a multiple of the turret (12) indexing speed is provided for final positioning of the turret (12) at a desired work station. The final position cam (50) is adjustable so that the tool turret (12) will be accurately stopped at a selected work station. The final position cam (50) also provides information which is utilized for switching from a high speed indexing mode to a low speed indexing mode when the selected work station is approached. Cams (40,42) and associated proximity switches (41,43) are also utilized for detecting when the tool turret (12) is in a clamped or unclamped position. The disclosed hydraulic circuit (59) provides for clamping and unclamping of the tool turret (12), high and low speed indexing, accurate positioning of the turret (12) at a selected work station, and safety relief to prevent over pressure in the hydraulic lines.
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