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针对六辊矫直机不能对管材头尾实现“三点压弯”进行矫直的问题,采用了双曲线辊型和二辊反弯辊型相结合的复合辊型管材矫直机对管材全长进行高精度矫直。以金属弹塑性理论为基础,推导了强化金属管材弯矩公式,并根据此公式通过Matlab编程计算最佳二辊反弯曲率比取值,与以往依靠经验取值的方法有所不同。通过Matlab求解辊型曲线,并绘制了相应的辊型图。通过有限元模拟软件Marc,建立复合辊型矫直机模型,对矫直过程进行有限元分析,最终得到最佳压弯量(第一对辊子1.0 mm,第二对辊子1.15 mm,第三对辊子1.15 mm,第四对辊子0.4 mm)和压扁量(11.5 mm)。
Aiming at the problem that the six-roller straightening machine can not straighten the head and the tail of the pipe to achieve the three-point bending, the double-curve roller type and the two-roller reverse bending type Full-length pipe for high-precision straightening. Based on the theory of metal elasticity and plasticity, the bending moment formula of metal pipe is deduced. According to this formula, the best two-roll bending ratio is calculated by Matlab programming, which is different from the previous method of relying on experience value. Solve the roll curve by Matlab, and draw the corresponding roll diagram. Through the finite element simulation software Marc, the model of compound roller straightener was established, and the finite element analysis of the straightening process was carried out to get the optimal bending deflection (the first pair of rollers 1.0 mm, the second pair of rollers 1.15 mm, the third pair Roller 1.15 mm, fourth pair of rollers 0.4 mm) and flattening (11.5 mm).