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高强度钢筋在弯箍机上进行弯箍加工成一定角度后,在残余应力作用下钢筋会产生回弹现象。为了提高箍筋角度的精度,需要考虑回弹角度对箍筋角度的影响。基于弹塑性弯曲回弹理论,考虑加工硬化影响的情况下,推导出箍筋角度与回弹角度的关系式。并基于弯箍转盘几何模型,推导出弯箍转盘转角与箍筋角度的关系。应用MARC有限元软件建立弯箍模型,分析了弯箍成形速度、弯箍轴回转半径对钢筋回弹角的影响。进行弯箍成形实验,结果表明,弯箍成形速度对回弹角度影响较小,回弹角随着弯箍轴回转半径的增大而增大,实验结果与有限元模拟结果基本吻合。
High-strength steel in the bending hoop bending machine hoop processing into a certain angle, the residual stress in the rebar will produce rebound phenomenon. In order to improve the accuracy of stirrup angle, we need to consider the effect of rebound angle on stirrup angle. Based on the elastic-plastic bending rebound theory, considering the effect of work hardening, the relationship between stirrup angle and rebound angle is deduced. Based on the geometrical model of the hoop turntable, the relation between the angle of the hoop turret and the angle of the stirrup is deduced. The finite element software MARC was used to establish the model of the bending band, and the influence of the forming speed of the bending band and the turning radius of the bending band on the rebound angle of the bar was analyzed. The results show that the forming speed of the bending band has little effect on the bouncing angle, and the bouncing angle increases with the turning radius of the bending band. The experimental results are in good agreement with the finite element simulation results.