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浙江大学学报(工学版)
机械与能源工程     
电极损耗分层预变形补偿方法
陈健, 王进, 陆国栋
1.浙江大学 流体动力与机电系统国家重点实验室,浙江 杭州310027
2.浙江纺织服装职业技术学院,浙江 宁波 315211
Electrode wear layered compensation method with pre-deformation
CHEN Jian, WANG Jin, LU Guo-dong
1. State Key Laboratory of Fluid Power Transmission and Mechatronic Systems and Control, Zhejiang University, Hangzhou 310027, China; 
2. Zhejiang Fashion Institute of Technology, Ningbo 315211, China
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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30 μm,有助于实现精密加工.

Abstract:
A new compensation method was developed to improve the die-sinking electrical discharge machining (DEDM) precision by the layered and pre-deformation of the initial electrode shape when the wear value is high. Firstly, the pre-deformation compensation theory was analyzed, and a model was set up to compute the wear volume with the wear ratio between the electrode and workpiece. Then, the electrode shape was dispersed to compensate the wear volume after non-uniform rational B-splines (NURBS)fit; an equal-loss but non-uniform layered compensation method was presented based on the linear relationship between the total wear volume and the single wear one. By this method, a layer pre-deformation compensation was molded, whose offset length was decided by the curvature and the feed path decides the offset direction. Finally, the offset shape was smoothed by the energy method and genetic algorithm; the compensation process was designed to obtain the initial shape of the electrode. Example and experiment results show that the average geometry error of the DEDM with the compensation method is less than 30 μm, which helps to achieve precision machining.
出版日期: 2017-03-01
CLC:  TG 661  
基金资助:

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)

通讯作者: 王进,男,副教授,博士. ORCID: 0000-0003-3106-021X.     E-mail: dwjcom@zju.edu.cn
作者简介: 陈健(1979—),男,博士生,从事电火花加工技术研究.ORCID: 0000-0002-8830-5401. E-mail: chj_zju@zju.edu.cn
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引用本文:

陈健, 王进, 陆国栋. 电极损耗分层预变形补偿方法[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2017.03.002.

CHEN Jian, WANG Jin, LU Guo-dong. Electrode wear layered compensation method with pre-deformation. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2017.03.002.

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