航空发动机叶片等离子焊修复精确成形控制方法研究

项目名称： 航空发动机叶片等离子焊修复精确成形控制方法研究

项目编号： No.U1333128

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 李亮玉

作者单位： 天津工业大学

项目金额： 36万元

中文摘要： 针对目前民航客机发动机叶片基本上都要送到国外维修的现状，根据民航适航要求，开展发动机叶片的叶尖磨损（或腐蚀）等离子焊精确修复成形技术研究，提出一种基于高频电磁场产生附加分布电磁力克服表面张力变化，获得焊接熔池精确成形的控制方法。 通过研究叶片这种特殊条件下焊接熔池的力学行为，掌握熔池表面张力、电弧力、重力对熔池成形精度的影响规律；研究叶片修复时热积累和温度场的变化导致表面张力的变化，获得温度场对熔敷成形精度的作用规律；研究外加高频磁场参数对熔池内附加电磁力分布规律和大小的影响，研究附加电磁力对叶片熔池力学行为及对焊缝成形的作用规律，为叶片熔池精确成形磁场控制建立相应的理论基础；提出控制激磁线圈的电流大小，从而实现控制附加电磁力克服表面张力变化的方法，通过对比实验，验证叶片精确成形控制的有效性。本项目旨在为较低成本的叶片修复精确成形提供一条新的途径并建立相应的理论基础。

中文关键词： 薄壁零件；熔池；表面张力；电磁压力；

英文摘要： According to the civil airworthiness requirement, the technology of the precision forming for aero-engine blade repair is researched using plasma arc welding in the present situation that aero-engine blade must be repaired abroad. A control method of welding pool precision forming is put forward using high frequency electromagnetic field to overcome the surface tension of welding pool on the blade tip. The influence mechanism on the welding pool forming precision affected by surface tension, arc force and gravity is to obtain by studying the mechanical behavior of welding pool on the blade tip. To study surface tension varied with heat accumulation and temperature field, for obtaining the actual mechanism of temperature field to welding pool forming precision. To research external electromagnetic force distribution and magnitude in welding pool and its variance with electrical parameters of high frequency magnetic field, and to research welding forming mechanism on external electromagnetic force to blade pool mechanical behavior, for obtaining theoretical basis of precision forming of blade pool. A method is put forward that the electromagnetic force is applied to overcome surface tension ,which is controlled by altering current value of exciting coil. The validity of precise forming control method is veri

英文关键词： Thin-walled parts；Welding pool；Surface tension；Electromagnetic pressure；