| 摘要 |
<p>A process for heating elongate metal material (2), for example elongate aluminium, in stepwise passage through a plurality of series-arranged, separately controllable heating zones (A, B, C), for each of which an intended temperature is preset and monitored at a check-measuring point, the elongate metal material (2) is, after it has reached the intended temperatures, conveyed forward by the distance A + X for shearing off a block of length X and, after this block has been sheared off, conveyed back by the length A, A being the distance between the front end of the metal material located before the forward-conveying in the last heating zone (d) and the shears (3), the temperatures on the surface of the metal material at the check-measuring point of at least the first heating zone (A) and at a measuring point offset rearwards therefrom by the length L are detected immediately before the metal material is conveyed forward, with L >/= X. From these two temperature measurements, the temperature gradient is determined. Starting from this, that heating power is determined and applied which, after the forward-conveying by the length A + X and the back-conveying by the length A, gives again essentially the intended temperature at least at the check-measuring point of the first heating zone. The required heating power can, on the basis of these measurements, also be calculated for the next and/or further heating zones, for which the determination of a temperature gradient between the check-measuring points of successive heating zones can be helpful. <IMAGE></p> |
