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生产无缝钢管时,斜轧穿孔过程对内折产生有很大影响。内折的产生是由于顶头前管坯中心部位金属的完整性被破坏和孔腔开裂的结果。许多论著研究了轴心缺陷如何形成这一课题。轴心孔腔的形成与管坯轴向送进摩擦力和扭转有关的穿轧过程特点没有直接关系:试验证实。金属破坏前管坯轴心部份金属发生显著拉缩。金属轴心部份拉缩及其被破坏与管坯的横向辗轧有密切关系。横向辗轧程度越大,轴心部份金属的拉缩程度和塑性变形就越大,
During the production of seamless steel pipe, the process of cross-piercing piercing has a great influence on the folding inside. The internal fold is due to the destruction of the integrity of the metal at the center of the pre-head tube and the cracking of the cavity. Many studies have examined how axis defects form this issue. The formation of axial cavity and tube axial feeding friction and torsion-related characteristics of the wear-rolling process has no direct relationship: the test confirmed. Before the metal rupture of the tube axis part of the metal significant contraction. Part of the metal axis of contraction and its destruction and the tube rolling is closely related to the lateral. The greater the degree of horizontal rolling, the axis of the metal part of the degree of contraction and the greater the plastic deformation,