| 摘要 |
1,139,806. Forging. DAVY & UNITED ENG. CO. Ltd. 29 March, 1966 [7 April, 1965], No. 14810/65. Heading B3H. In the forging of a workpiece 21 carried by a manipulator 12 moving at a constant pro-set speed, the press cycle is initiated automatically when the manipulator has moved through a distance corresponding to the desired bite. The manipulator is driven along rails 10 by a variable speed hydraulic motor 8 as described in Specifications 874,909 and 1,011,774 and its peel 20 is movable relatively to the manipulator carriage under hydraulic control as described in Specification 1,015,711. The forging press 14 is driven hydraulically and controlled as described in Specification 1,114,234. Movement of the manipulator along its rails 10 produces pulses from a pulse generator 22, which pulses are passed to a counter 23 and compared in a coincidence unit 24 with the desired bite preset by means 25. When this bite is reached a signal is passed along line 26 through gate 30 to the press control 27 for initiating a new press cycle. Simultaneously a re-set signal is passed along line 28 to the counter 23. If the manipulator moves through the desired bite before the press crosshead 16 reaches its upper limit, the gate 30 remains closed to prevent initiation of the next press cycle. Gate 30 is only opened by a press signal along line 31. If coincidence occurs before the reset counter signal on line 28, due to the manipulator speed being set too fast, a signal is passed by gate 33 to line 34 for stopping both the manipulator and the press. Reference has been directed by the Comptroller to Specification 947,863. |
