大型薄壁回转体加工变形研究

发布时间：2018-06-02 05:14

本文选题：航空薄壁件 + 车削加工　；参考：《沈阳航空航天大学》2016年硕士论文

【摘要】：随着我国航空事业的快速发展,航空制造业对零件的使用性、安全性、环保性等各方面性能的要求不断提高。为了提高推重比,飞机零部件广泛使用薄壁整体结构件,然而这类薄壁件尺寸大,刚性差,在加工过程中容易变形从而难以满足加工要求,影响零件的使用性能乃至飞机服役寿命。针对航空发动机二级低压短筒机匣加工变形问题,论文通过有限元模拟仿真、ABAQUS软件二次开发技术、切削实验等科学方法,实现了大型薄壁回转体的加工变形预测并对影响薄壁件加工变形较为突出的装夹问题做了研究。首先,通过对有限元方法切削方法的研究,探讨动态切削仿真、静态切削仿真两种建模方法的关键技术,对比两种方法的优缺点。基于ABAQUS软件的二次开发技术,通过研究切削力载荷自动加载与卸载和最大加工变形分析及识别等关键技术,提出一种有限元快速仿真技术。其次,运用ABAQUS有限元仿真软件,建立高温合金材料GH4169车削加工的三维动态车削模型,分析工件的应力场和温度场的模拟结果,分析切削力在不同切削参数下的变化规律。再次,通过动态车削仿真的切削力预测结果和有限元快速仿真技术,运用所开发软件建立大型薄壁回转体零件的车削加工变形预测模型,对薄壁回转体的整体变形进行预测。最后,对薄壁件加工变形影响较为突出的装夹问题进行研究,对比工件使用辅助支撑和无辅助支撑两种条件下的加工变形计算结果,分析辅助支撑在切削加工中的作用,并研究不同辅助支撑元件数目、长度、位置等因素对加工变形量的影响规律。
[Abstract]:With the rapid development of the aviation industry in China, the requirements of the aviation manufacturing industry for the performance of parts, such as usability, safety, environmental protection, etc. In order to improve the push-weight ratio, thin-walled integral parts are widely used in aircraft parts. However, such thin-walled parts are large in size and poor in rigidity, so they are easily deformed in the process of processing and are difficult to meet the processing requirements. It affects the performance of parts and even the service life of aircraft. In order to solve the problem of machining deformation of aeroengine two-stage low-pressure short cylinder casing, this paper uses finite element simulation software Abaqus software secondary development technology, cutting experiment and other scientific methods. The prediction of machining deformation of large thin-walled rotary body is realized and the clamping problem which affects the machining deformation of thin-walled parts is studied. Firstly, the key techniques of dynamic cutting simulation and static cutting simulation are discussed, and the advantages and disadvantages of the two methods are compared. Based on the secondary development technology of ABAQUS software, a fast finite element simulation technique is proposed by studying the key technologies such as automatic loading and unloading of cutting force load and maximum machining deformation analysis and identification. Secondly, using ABAQUS finite element simulation software, the three-dimensional dynamic turning model of GH4169 turning of superalloy material is established, and the simulation results of stress field and temperature field of workpiece are analyzed, and the variation law of cutting force under different cutting parameters is analyzed. Thirdly, through the cutting force prediction results of dynamic turning simulation and the fast finite element simulation technology, the prediction model of turning deformation of large thin-walled rotary parts is established by using the developed software, and the integral deformation of thin-walled rotary body is forecasted. Finally, this paper studies the clamping problem of thin-walled workpiece machining deformation, compares the calculation results of machining deformation between workpiece with auxiliary support and without auxiliary support, and analyzes the role of auxiliary support in cutting machining. The effects of the number, length and position of different auxiliary support elements on the machining deformation are studied.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V263

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