脉冲振动电解加工相位耦合控制策略研究与应用

发布时间：2018-03-18 12:08

本文选题：电解加工　切入点：振动　出处：《南京航空航天大学》2017年硕士论文　论文类型：学位论文

【摘要】：电解加工技术是航空发动机叶片、机匣等核心部件的关键制造技术,但随着航空工业的发展,新型发动机零部件结构日趋复杂,精度要求日益提高,对现有的电解加工技术提出了越来越多的挑战。本文以提升电解加工精度与加工整平能力为目标,开展脉冲振动相位耦合电解加工技术研究,分析了脉冲振动耦合电解加工的产物输运情况和加工电流,掌握了脉冲振动相位耦合参数对加工精度与整平能力的影响,并采用脉冲振动相位耦合技术完成了典型航空发动机模锻叶片加工试验。本文的主要研究内容如下:(1)搭建了脉冲振动相位耦合研究平台。设计了工具阴极往复机械振动装置与加工间隙可视化的工装夹具,完善了基于IGBT的脉冲振动相位耦合控制系统,采用高速摄像、电流传感器、电涡流位移传感器、示波器和记录仪建立了脉冲振动相位耦合信号采集与检测系统,实现了加工电流波形、振动位移波形、间隙内视频图像等信息实时采集与记录。(2)提出了脉冲振动错位前置耦合策略。在分析直流与工具振动耦合电解加工基础上,发现了加工电流波形前置于工具阴极振动波形的现象,提出了以直流与工具振动耦合电解加工中电流波形的波峰为中心,对称分布脉冲电流开通角的错位前置耦合策略。通过传统与错位前置方法的对比试验、不同开通角范围的加工试验,证明了脉冲振动错位前置耦合策略的合理性。(3)开展了脉冲振动错位前置耦合电解加工试验研究。为了进一步比较传统与错位前置耦合方法的合理性,开展了传统同相位耦合与错位前置耦合的极限加工速度、最小稳定加工间隙、加工整平能比对比试验,试验结果表明错位前置耦合策略更具合理性。以典型航空发动机涡轮叶片为对象,针对叶片模锻毛坯试件精度差,余量小等特点,采用错位前置耦合电解加工工艺成功加工出叶片试件,试件具有较好的加工精度与表面质量。
[Abstract]:ECM technology is the key manufacturing technology of aero-engine blade, casing and other core components. However, with the development of aviation industry, the structure of new engine parts is becoming more and more complex, and the precision requirement is increasing day by day. More and more challenges have been put forward to the existing ECM technology. In order to improve the precision and leveling ability of ECM, the pulse vibration phase coupled ECM technology is studied in this paper. The product transport and machining current of pulse vibration coupled electrolytic machining are analyzed, and the influence of pulse vibration phase coupling parameters on machining accuracy and leveling ability is grasped. The pulse vibration phase coupling technique is used to complete the machining experiment of typical aero-engine die forging blade. The main research contents in this paper are as follows: 1) the research platform of pulse vibration phase coupling is built, and the tool cathode reciprocating machine is designed. Mechanical Vibration device and Machining clearance Visualization fixture, The pulse vibration phase coupling control system based on IGBT is perfected. The acquisition and detection system of pulse vibration phase coupling signal is established by using high speed camera, current sensor, eddy current displacement sensor, oscilloscope and recorder. The information of machining current waveform, vibration displacement waveform and video image in gap are collected and recorded in real time. The forward coupling strategy of pulse vibration dislocation is put forward. Based on the analysis of DC and tool vibration coupled electrolytic machining, The phenomenon that the machining current waveform is placed in front of the tool cathode vibration waveform is found, and the peak of the current waveform in the DC and tool vibration coupled electrolytic machining is proposed as the center. The misplacement precoupling strategy of symmetrical distributed pulse current opening angle. Through the contrast test between traditional and misplaced preposition method, the processing test of different opening angle range, It is proved that the precoupling strategy of pulse vibration misalignment is reasonable. (3) the experimental study of pulse vibration dislocation front coupling ECM is carried out. In order to further compare the rationality of traditional and misplaced front coupling methods, The limit machining speed, the minimum stable machining clearance and the machining leveling energy ratio of the traditional in-phase coupling and misalignment front coupling are carried out. The test results show that the misalignment leading coupling strategy is more reasonable. Taking typical aero-engine turbine blades as an example, the characteristics of low precision and small margin of blade die forging blank specimen are discussed. The blade specimen was successfully machined by staggered front coupled electrolytic machining (ECM) process. The specimen has good machining accuracy and surface quality.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG662

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