| 摘要 |
<p>The invention relates to a method of quenching, profiled elements (1) that have been produced by profiling sheet billets. The method employs the use of a heat treatment device having a hardening zone (2) which includes an inductor (7) and a water shower arrangement (10). Profiled elements are advanced through the hardening zone by means of rear feed rollers (3) and front pulling rollers (4) provided on respective sides of the hardening zone. The rollers (3, 4) keep the profiled elements stretched by rotating at mutually different peripheral speeds, therewith avoiding changes in shape of the profiles during the hardening process. The tensile stress to which the profiles are subjected during the profile stretching process is controlled in relation to the properties of the profiles by using mutually independent drive units (5, 6), such as to optimally stretch a given profiled element. The drive units (5, 6) enable the relative peripheral speed of said rollers to be continuously controlled. The relative position of the profiled element (1) is determined as the profiled element is drawn through the heating zone and the tensile stress to which said element is subjected is calculated at each moment in time and sent in signal-form to a computer (11). On the basis of these data and predetermined, computer-stored reference data relating to the given profiled element, the computer controls and adjusts the tensile strss to a value determined on the basis of said reference data, with the aid of said drive units (5, 6).</p> |
