带冠整体叶轮电火花加工电极及其运动轨迹同步设计方法
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摘要
电火花加工是带冠整体叶轮整体制造的重要工艺方法,其电极及加工运动轨迹设计直接影响加工质量和加工效率。由于带冠整体叶轮叶间流道弯扭狭窄,使得电极及其运动轨迹设计往往比较复杂。提出一种以保证电极成形面完整和最大刚度为核心的电极及其运动轨迹同步设计方法,并基于计算机辅助设计UG二次开发平台研究了该同步设计方案的实现方法。以某型带冠整体叶轮的试制加工为例进行了试验验证,结果表明该方法可显著提高设计效率,并能够满足加工精度和加工稳定性要求。
Electrical discharge machining( EDM) is an important process technique to machine the cowled integral impeller,and the processing quality and efficiency are directly influenced by the design of electrode and its feeding path. The design of electrode and its feeding path is very complicated because of the narrow and twisted channel between two blades. A synchronous design method of electrode and its feeding path is put forward to get a maximum stiffness electrode with complete forming surface corresponding to the blade's surface,and its implement method is also studied based on UG software. The design efficiency,machining accuracy and stability are all improved significantly. A cowled integral impeller's EDM experiment is verified.
Electrical discharge machining( EDM) is an important process technique to machine the cowled integral impeller,and the processing quality and efficiency are directly influenced by the design of electrode and its feeding path. The design of electrode and its feeding path is very complicated because of the narrow and twisted channel between two blades. A synchronous design method of electrode and its feeding path is put forward to get a maximum stiffness electrode with complete forming surface corresponding to the blade's surface,and its implement method is also studied based on UG software. The design efficiency,machining accuracy and stability are all improved significantly. A cowled integral impeller's EDM experiment is verified.
引文
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[2]Zhang M,Chu Q,Li J,et al.Failure analysis of a welded impeller in coke oven gas environment[J].Engineering Failure Analysis,2014,38(2):16-24.
[3]Zhu D,Zhu D,Xu Z,et al.Trajectory control strategy of cathodes in blisk electrochemical machining[J].Chinese Journal of Aeronautics,2013,26(4):1064-1070.
[4]杨振朝.整体涡轮电火花加工工艺研究[D].西安:西北工业大学,2006.YANG Zhen-chao.Research on machining technique of solid turbine with EDM[D].Xi'an:Northwestern Polytechnical University,2006.(in Chinese)
[5]赵建社,刘辰,吴锐,等.闭式整体构件组合电加工关键技术研究[J].机械工程学报,2011,47(1):169-176.ZHAO Jian-she,LIU Chen,WU Rui,et al.Key technology research of combined electrical machining of closed integral structure[J].Journal of Mechanical Engineering,2011,47(1):169-176.(in Chinese)
[6]孙晓岚.闭式整体叶盘电火花加工表面质量研究[D].上海:上海交通大学,2013.SUN Xiao-lan.Key techniques for EDM of shrouded blisk's surface quality[D].Shanghai:Shanghai Jiao Tong University,2013.(in Chinese)
[7]郭紫贵,云乃彰,张磊.数控展成电解加工带冠整体叶轮的运动规划及其实现[J].电加工与模具,2007(5):20-24.GUO Zi-gui,YUN Nai-zhang,ZHANG Lei.Movement design and realization for integral impeller with ring in NC-electrochemical contour evolution machining[J].Electromachining&Mould,2007(5):20-24.(in Chinese)
[8]贠敏,爨莹,于源,等.六轴联动创成式电火花加工的运动变分原理及电极轮廓计算[J].汽轮机技术,2001,43(5):313-316.YUN Min,CUAN Ying,YU Yuan,et al.Six axis synchronal generating EDM motion variation theory and electrode contour calculation[J].Turbine Technology,2001,43(5):313-316.(in Chinese)
[9]赵万生,詹涵菁,王刚,等.带冠涡轮叶盘弯扭通道中复杂电极的进给轨迹[J].国防科技大学学报,2000,22(5):78-82.ZHAO Wan-sheng,ZHAN Han-jing,WANG Gang,et al.Feeding complex electrodes through twist channels of rimed turbine blisks[J].Journal of National University of Defense Technology,2000,22(5):78-82.(in Chinese)
[10]Li G,Zhao W S,Wang Z L,et al.A special CAD/CAM software for electro-discharge machining of shrouded turbine blisks[J].Journal of Shanghai University:English Edition,2007,11(1):74-78.
[11]Liu X,Kang X,Zhao W,et al.Electrode feeding path searching for 5-axis EDM of integral shrouded blisks[J].Procedia Cirp,2013,6(8):107-111.
[12]Liu X,Kang X,Xi X,et al.Electrode feed path planning for multi-axis EDM of integral shrouded impeller[J].The International Journal of Advanced Manufacturing Technology,2013,68(5):1697-1706.
[13]Ayesta I,Izquierdo B,Sanchez J A,et al.Optimum electrode path generation for EDM manufacturing of aerospace components[J].Robotics and Computer-Integrated Manufacturing,2016,37:273-281.
[14]刘辰,徐家文,赵建社,等.三元流闭式叶轮组合电加工技术研究Ⅲ——数控电火花精加工关键技术[J].航空学报,2010,32(6):1299-1304.LIU Chen,XU Jia-wen,ZHAO Jian-she,et al.Research of combined electrical machining of 3D-flow closed impellersⅢ—key techniques of numerically controlled electron discharge machining for precision work[J].Acta Aeronautica et Astronautica Sinica,2010,31(6):1299-1304.(in Chinese)