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    • 4. 发明授权
    • Method of forming a composite tubular unit by expanding, low-frequency
induction heating and successively quenching
    • 通过膨胀,低频感应加热和连续淬火形成复合管状单元的方法
    • US5097585A
    • 1992-03-24
    • US642137
    • 1991-01-15
    • Robert E. Klemm
    • Robert E. Klemm
    • B21C37/15B23P11/02B21D39/20H05B6/06
    • B23P11/025B21C37/154Y10S29/024Y10T29/49865Y10T29/49911Y10T29/4994
    • A multi-walled composite tube member is formed from two superimposed pipes having a gap therebetween. The inner pipe is forcibly expanded in excess of the gap to deform and expand the outer pipe. The expander including a mandrel is forced through the aligned pipes while maintaining the longitudinal alignment. The diameter of the mandrel corresponding to the final desired diameter to finally size the composite pipe section and establish a true round inner passage. An induction heating coil operating at a low frequency operating in the range of low hundreds hertz in contrast to a conventional high frequency unit operating at thousands of hertz is coupled to and moved relative to the expanded pipe unit, progressively heats small lengths of the expanded pipe unit. The expanded pipe unit is quenched with a chilled brine solution applied to both surfaces. The brine solution provides a rapid interchange of heat and hardening of the inner liner, while the application to both surfaces improves the hardening of the outer pipe wall. The composite pipe is formed in a single pass to avoid distortion which may occur on each of a plurality of heating passes, and to improve grain growth, minimize cracking and reduce energy consumption and cost.
    • 多壁复合管构件由两个在其间具有间隙的重叠管形成。 内管被强制地膨胀超过间隙以使外管变形和膨胀。 包括心轴的膨胀器在保持纵向对准的同时被迫通过对准的管道。 心轴的直径对应于最终期望的直径,以最终对复合管段进行大小并建立真正的圆形内部通道。 与以数千赫兹工作的常规高频单元相比,在低数百赫兹范围内工作的低频工作的感应加热线圈相对于膨胀管单元耦合并移动,逐渐加热较小长度的膨胀管 单元。 膨胀管单元用施加到两个表面的冷冻盐水溶液淬火。 盐水溶液提供内衬的热和硬化的快速交换,同时应用于两个表面改善了外管壁的硬化。 复合管以单程形成,以避免在多个加热通道中的每一个上可能发生的变形,并且改善晶粒生长,使开裂最小化并降低能量消耗和成本。