According to double radius method and edge bend method, this paper introduces the design theory of roll pass with opposite direction bend in middle part for cold forming of round pipe.
本文在双半径法和边缘弯曲法的基础上，介绍了一种冷弯圆管的中部反向弯曲孔型设计理论。
A cold roll forming machine of side beam has been introduced with analysis of the new electrical equipment design and its implementation means.
结合某汽车厂引进的汽车纵梁冷弯成形设备，分析了新设备的电气方案设计及其实现手段。
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