电极损耗分层预变形补偿方法

发布时间：2018-05-30 12:04

本文选题：电火花成型加工(DEDM) + 电极损耗　；参考：《浙江大学学报(工学版)》2017年03期

【摘要】：为了提高大损耗量条件下电火花成型加工(DEDM)的精度,提出一种基于初始形状预变形的电极损耗补偿方法.分析电极损耗预变形补偿基本原理,建立以相对体积损耗比为基础的电极损耗量模型.在非均匀有理B样条曲线(NURBS)三维表征的基础上进行电极曲面的离散;根据单次放电损耗量与总损耗量的线性关系,提出基于放电间隙的等损耗非均匀的分层补偿方法;构建基于平均曲率的偏移长度和基于伺服进给的偏移方向的计算模型,得出补偿矢量.结合能量法和遗传算法进行曲面光顺,并建立电极损耗的预变形补偿流程模型,计算电极的预变形形状.算例和实验结果表明,采用该方法补偿后的电火花成型加工产生的平均几何误差小于30μm,有助于实现精密加工.
[Abstract]:In order to improve the accuracy of EDM under the condition of large loss, an electrode loss compensation method based on initial shape predeformation is proposed. The basic principle of electrode loss predeformation compensation is analyzed and the electrode loss model based on relative volume loss ratio is established. Based on the three-dimensional representation of nonuniform rational B-spline curves, the surface of the electrode is discretized, and according to the linear relationship between the loss of single discharge and the total loss, an equal-loss compensation method based on discharge gap is proposed. The model of offset length based on mean curvature and offset direction based on servo feed is constructed, and the compensation vector is obtained. Based on the energy method and genetic algorithm, the surface fairing is carried out, and the pre-deformation compensation flow model of electrode loss is established to calculate the pre-deformation shape of the electrode. Numerical examples and experimental results show that the average geometric error produced by EDM compensated by this method is less than 30 渭 m, which is helpful to the realization of precision machining.
【作者单位】：浙江大学流体动力与机电系统国家重点实验室;浙江纺织服装职业技术学院;
【基金】：国家自然科学基金资助项目(51675470) 中央高校基本科研业务费专项资金资助项目(2015QNA4003) 浙江省自然科学基金资助项目(LY15E050003) 宁波市科技创新资助项目(2015B1109)
【分类号】：TG661

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