The common way of designing the section of steel-structure axle-center pressed structural member is trying means or gradual approaching means.
一般钢结构的轴心受压构件，其截面设计都采用试凑法或逐次逼近法。
The steel axle of this kind of pig can bend under greater thrust force, it is helpful to pass through elbow or the section of converting pipe, so it can avoid efficiently block accident.
该清管器的钢轴能在较大推力作用下发生弯曲变形，有利于通过弯头或变形管段，可有效避免堵卡事故的发生。
IHPF is fit for manufacturing hollow components with changeable cross-section including typical structural components, hollow axle parts and special shape pipes.
内高压成形适合于制造空心变截面构件，给出了用内高压成形制造的典型结构件、空心轴类件和异形管件。
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