| 摘要 |
An apparatus (G) for producing soldered multi-layer metal tubes (10) has a rolling device (A-E) with several forming-roller pairs (21, 21; 24, 25) for the gradual plastic forming of a flat metal strip (11) into a slit tube (at 17) and then into an at first unsoldered, multi-layer tubular body (RK). The multi-layer tubular body (RK) passes through electric feeder points (P1, P2) of a conductive heating zone (Z). The electric feeder points (P1, P2) have contact rollers (24, 25; 28, 29) arranged at an axial distance from one another. The conductive heating zone (Z) has a preheating zone (ZV) and an annealing zone (ZG) following downstream. A cooling section (at 32) follows the annealing zone (ZG). A forming-roller pair (24, 25) enclosing the unsoldered, multi-layer tubular body (RK) at the same time forms the first contact-roller pair arranged upstream, which represents a first electric feeder point (P1) at the start of the heating zone (Z). A second contact-roller pair (28, 29) arranged downstream of the first contact-roller pair (24, 25) forms the second electric feeder point (P2) as well as the end of the heating zone (Z) and is provided with a separate drive for a greater circumferential speed than that of the first contact-roller pair (24, 25). The tube-conveying device (F) arranged downstream behind the cooling section (at 32) can be adjusted as a function of the tube-feed rate prevailing in the area of the second contact-roller pair (28, 29). <IMAGE> |
