基于改进BP算法的折弯机核心算法研究

Kernel Algorithm Research of Bending Machine Based on Improved BP Algorithm

针对数控折弯系统的控制精度不高,计算误差较大的问题,从工程实际的可操作性出发,构建BP网络,使用大量来源于生产现场的样本对网络进行训练,拟合出折弯半径和下模开口宽度、板材厚度间的关系曲线。根据平面几何和三角函数原理,利用折弯半径这一重要纽带,研究出进深和后档料的计算公式。把研究出的公式应用到自主研发的折弯数控系统中,并进行数据记录,测试结果表明,利用研究的计算公式可以精确定位后档料,准确控制上模滑块的行程,加工出来的样件完全符合工艺要求,大大提高了系统控制精度。

Definition is an important index for the performance of bending machine.It depends on the algorithm of control system.At present,for the reason of computing error,CNC bending system can＇t control very well.BP network is established to simulate the connection between bend segment radius and open slot width,material thickness.And numerous sample data is used to train the network.Then bend segment radius is used to research ram stroke and the back gauge moving,based on plane geometry and trigonometric function.Test result shows that the computing formula worked out by this paper can make back gauge positioned accurately,and control ram stroke moving well and truly.