| 摘要 |
<p>1,109,075. Automatic size control. GENERAL DYNAMICS CORPORATION. Nov. 23, 1966 [Feb. 4, 1966], No. 52490/66. Heading G3R. A transverse dimension of a workpiece is reduced by passing it longitudinally through a machine in which the degree of reduction is automatically controlled in dependence on deviations of draft ratio and input thickness to maintain an output dimension of the workpiece substantially constant. In Fig. 1, material 7, uncoiled from a mandrel 5, passes through reversing rolls 4 and is re-coiled on a mandrel 6. Electrical pulses produced by generators 12, 13 driven by travel of the material before and after rolling are applied to a comparator 18 the output signal of which, on line 23, corresponds to deviation of the draft ratio from a datum value determined by a signal applied to line 19. A radiation or contact gauge 8 produces a signal, corresponding to deviation of ingoing thickness from a datum value, which is delayed by a unit 15 for a time equal to that required for the material to move from gauge 8 to rolls 4. This delay is produced in unit 15 by causing pulses from generator 12 to operate stepby-step switches which periodically charge condensers and later transfer those charges to the output circuit. The draft ratio and delayed ingoing thickness deviation signals are respectively amplified at 24, 21 and modified by potentiometers 25, 22 set in accordance with the datum values of ingoing thickness and draft ratio so that when combined in an integrating amplifier 30, a signal is produced representative of outgoing thickness, variations of which are then automatically corrected by control of an electrically or hydraulically operated roll separation adjusting device 3 of the wedge or screw type. Filtered signals from a further thickness gauge 9 may be applied to amplifier 30 to ensure greater accuracy in maintaining outgoing thickness at a desired value. A more accurate prediction of outgoing thickness may be obtained by also applying the product of the draft ratio and ingoing thickness deviation signals to input terminal C of amplifier 30. Correction may be effected by automatic control of mandrel drives 28, 29 instead of or in addition to roll separation. Application to tube drawing is referred to.</p> |
