| 摘要 |
PURPOSE:To continuously draw a hardly workable material and to improve a productivity by heat-treating to soften a blank pipe on line during each cold drawing process. CONSTITUTION:The base pipe fed from base pipe feeding apparatus 11 is reduced its diameter and thickness by a drawing die and a drawing plug constituting a drawing unit 13 after straightened at a warp correcting apparatus 12. A winding drum 14 for drawing generates a drawing force by winding the blank pipe around the drum by several rounds. The blank pipe is wound on the winding drum 14 for drawing by several rounds, then inserted into the on line heat-treating apparatus 15, a work hardened structure by the cold drawing work is softened. After that, solution annealing is performed through a water cooling apparatus 16. Through the drawing unit 13-the water cooling apparatus 16, the water cooling drawing and its softening heat treatment of one round is completed and by repeating this process continuously, thin pipes of small diameter are produced efficiently. After working is finished, the pipe is wound by the coil take-up apparatus 17.
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