高速冲压装备施力机构热态特性分析及优化研究

发布时间：2018-05-31 20:49

本文选题：高速冲压装备 + 施力机构　；参考：《浙江大学》2016年硕士论文

【摘要】：施力机构的热态特性是影响高速冲压装备工作性能最重要的因素之一,在很大程度上决定了高速冲压装备的加工精度和加工效率。论文以高速冲压装备施力机构为研究对象,分析了施力机构的热源与热传递方式,给出了施力机构内部发热与传热的计算公式,提出了考虑多形变机制的接触热阻计算模型,通过有限元仿真分析与实验验证了提出模型的有效性。在此基础上,进行了高速冲压装备施力机构的热结构耦合分析,提出了改善施力机构热态特性的措施。论文主要研究内容包括:第一章综述了高速冲压装备热态特性及优化设计研究现状,分析了现有研究的不足,阐述了论文的研究意义和研究内容。第二章分析了高速冲压装备施力机构的热源分布以及热传递的方式,建立了各热源发热量及对流换热的计算模型。第三章考虑了动摩擦因素的影响,给出了综合考虑微凸体的弹性、弹塑性、完全塑性三种形变机制和基体热阻、收缩热阻、不同面积接触点间热阻的固体接触面接触热阻计算模型。第四章利用提出的模型进行了施力机构的瞬态热平衡仿真分析,得到了施力机构的瞬态温度场变化及达到热平衡所需时间,并与不考虑接触热阻的仿真结果进行了比较。在此基础上,将仿真结果与热平衡实验结果数据进行对比,验证所提出的热态特性分析模型和接触热阻计算模型的有效性。第五章对高速冲压装备施力机构进行了热结构耦合仿真分析,详细讨论了滑块、主轴、连杆等主要零件的热变形情况,并在分析滑块热刚度影响因素的基础上,提出了增强其热刚度的方法。第六章总结了论文的研究工作,并展望了今后的研究方向。
[Abstract]:The hot state characteristic of the force acting mechanism is one of the most important factors that affect the working performance of high speed stamping equipment. To a great extent, it determines the machining precision and efficiency of the high speed stamping equipment. In this paper, the heat source and heat transfer mode of the force acting mechanism are analyzed, the calculation formula of heat and heat transfer inside the force acting mechanism is given, and the calculation model of contact thermal resistance considering multi-deformation mechanism is put forward. The validity of the proposed model is verified by finite element simulation and experiments. On the basis of this, the thermal structure coupling analysis of the force mechanism of high speed stamping equipment is carried out, and the measures to improve the thermal behavior of the mechanism are put forward. The main contents of this paper are as follows: the first chapter summarizes the research status of hot state characteristics and optimization design of high-speed stamping equipment, analyzes the shortcomings of the existing research, and expounds the significance and content of the research. In the second chapter, the heat source distribution and heat transfer mode of the force acting mechanism of high speed stamping equipment are analyzed, and the calculation models of heat and convection heat transfer of each heat source are established. In the third chapter, considering the influence of dynamic friction factors, three deformation mechanisms including elastic, elastoplastic and complete plasticity, thermal resistance of matrix and thermal resistance of shrinkage are given. Calculation model of contact thermal resistance of solid contact surface between different contact points. In chapter 4, the transient thermal balance of the mechanism is simulated by using the proposed model. The transient temperature field of the mechanism and the time required to achieve the thermal balance are obtained, and the results are compared with the simulation results without considering the contact thermal resistance. On this basis, the simulation results are compared with the results of the thermal balance experiment to verify the validity of the proposed thermal analysis model and the contact thermal resistance calculation model. In chapter 5, the thermal structure coupling simulation analysis of the force applying mechanism of high-speed stamping equipment is carried out, and the thermal deformation of the main parts such as slider, spindle and connecting rod is discussed in detail, and based on the analysis of the factors affecting the thermal stiffness of the slider. A method to enhance its thermal stiffness is proposed. The sixth chapter summarizes the research work of the thesis and looks forward to the future research direction.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG385

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