西安重型所与资阳钢管厂正在共同研制螺旋焊管冷扩径机。冷扩径时,要求内焊缝自动对准扩径头上的外刻槽,以免焊缝同扩径头相接触。为此,先后设计了位移式、杠杆式和电磁式三种方案并进行了试验。其中电磁式具有精度高、效果好、简单可靠等优点,现简介如 Xi’an Heavy and Ziyang Steel Plant are jointly developed spiral welded pipe cold expansion machine. Cold expansion, the internal weld automatically adjust the outer diameter of the groove on the groove, in order to avoid the weld with the expansion head contact. To this end, has designed a displacement, leverage and electromagnetic three programs and conducted a test. Among them, the electromagnetic type has the advantages of high precision, good effect, simple and reliable, and the like