选择合适的预紧力才能保证预应力机架稳定运行。本文对七辊棒材矫直机预应力机架立柱系统进行受力分析，并对预紧力进行计算校核，原安装时机架液压螺母预紧压力为15 MPa，远低于计算结果，故需要对机架重新进行预紧，确定预紧压力为32 MPa。通过试生产验证，机架原有振动基本消失，整机稳定性大为提高。%Select an appropriate pretightening is a precondition for operate the prestressed frame stable.This paper made a stress analysis to the pillar system of Seven roll bar straightening machine and got a calculation of pretightening,the pretightening force on hydraulic screw nut when installing frame is only 15 MPa,badly lower than that of calculation.Then pretightening frame again,confirmed the force of 32 MPa.The productive practice showed that the original vibration of frame is gone,and stability of press is increased.
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