| 摘要 |
<p>The rotational speed of the forming rolls is different during the heating up of the direct resistance heated workpiece, than during the actual size reduction work cycle. Pref. the heating up cycle speed of the rolls is lower. Suitable controls are incorporated for changing the rotational speed of the rolls when a preset temp. of the workpiece has been reached. The advantage of lower speed are less sparking and more uniform heating of the workpiece.</p> |
