| 摘要 |
PURPOSE:To prevent rotation of a punch and to keep the quality and shape of a U-can under good conditions by providing a rotation angle detector in a locker die and adjusting the pressure of an auxiliary cylinder to set the difference of rotation angle within specified limits. CONSTITUTION:Rotation angle detectors 18 and 17 are attached to locker dies 1 and 2. An output from the rotation detectors is sent to a comparator 19 and a rotation angle difference signal is outputted. The output is sent to a servo pump 20. The servo pump 20 supplies oil to an auxiliary cylinder 23 or 9 attached to the locker die of smaller rotation angle out of locker dies 1 or 2. Oil is recovered from the auxiliary cylinder attached to the locker die having larger rotation angle. Accordingly, left and right locker dies 1, 2 are synchronously controlled by feed back of signals from the rotation angle detectors 18, 17. |
