塑窗焊接机焊接热应力分析及工艺参数优化

发布时间：2018-03-06 02:15

本文选题：塑窗焊接机构　切入点：有限元分析　出处：《济南大学》2013年硕士论文　论文类型：学位论文

【摘要】：PVC塑窗是国家重点推广的节能建筑产品,焊接加工是塑窗组装中的重要工序之一,其加工质量与效率直接影响门窗的生产。由于目前缺少对塑窗焊接机焊接工况下工艺参数影响规律的研究,塑窗加工设备的焊接技术水平受到了制约。在总结国内外塑窗焊接研究现状的基础上,根据塑窗焊接机焊接机理及塑窗型材特有的热力学性能,通过计算机数值模拟仿真的方法,采用三维建模技术对焊接机焊板结构及型材焊接接头建立三维模型,运用有限元分析软件ANSYS对焊板预热及型材加热过程中的温度场、热应力应变场进行了数值模拟分析。采用实验方法验证了有限元仿真计算结果的正确性,并针对企业实际焊接过程中出现的问题,探索性提出了一种焊板内电热丝结构优化改进方案,得到不同焊接加热温度下对焊接热应力的影响规律。针对焊接过程中出现的焊板温度场分布不均匀问题,建立了焊接机焊板三维模型并进行了焊板预热过程中的温度场、应力应变场的有限元数值模拟仿真分析,获得了焊板预热后的温度场、应力应变场分布规律,并通过实验验证了仿真结果的正确性。通过分析导致焊板温度分布不均的原因,探索性提出了一种焊头机构焊板内部电热丝的结构优化方案,为塑窗设备生产企业改进产品提供数据支持,同时提供可参考的实验数据。在PVC型材实际焊接过程中,焊接工艺参数对焊接质量的影响尤为重要,论文研究了焊接加热温度参数对焊接角强度的影响规律。由于焊接加热温度的不同导致焊接接头内部产生不同的内应力,它的存在往往导致焊后型材出现焊接角强度不足等问题,影响构件的强度。对焊接接头在不同焊接加热温度下加热过程中的温度场与应力场进行了有限元数值仿真模拟,获得了焊接接头处温度场与应力场分布状况,得到了最大内应力的变化规律,提出了参数优化方案。通过焊接角强度测量实验得到了不同焊接温度下焊角强度的变化规律,通过内应力变化规律与角强度变化规律的综合分析与对比,验证了所提出的工艺参数优化方案的可行性。为以后进行其他的焊接工艺参数的研究提供研究方法与理论参考,有利于企业对塑窗焊接的加热温度工艺参数的优化选择。
[Abstract]:PVC plastic window is one of the most important energy-saving building products in China. Welding is one of the most important processes in plastic window assembly. Its processing quality and efficiency directly affect the production of windows and doors. The welding technology level of plastic window processing equipment is restricted. On the basis of summarizing the research status of plastic window welding at home and abroad, according to the welding mechanism of plastic window welding machine and the special thermodynamic properties of plastic window profile, Through the method of computer numerical simulation, the three-dimensional modeling technology is used to establish the three-dimensional model of welding plate structure and profile welded joint of welding machine, and the temperature field in the process of preheating and section heating of welding plate is analyzed by using finite element analysis software ANSYS. Numerical simulation analysis of thermal stress-strain field is carried out. The correctness of finite element simulation results is verified by the experimental method, and the problems in the actual welding process of enterprises are pointed out. In this paper, a scheme of optimizing and improving the structure of electric heating wire in welding plate is put forward, and the influence of welding heating temperature on welding thermal stress is obtained. In order to solve the problem of uneven distribution of welding plate temperature field in welding process, a three-dimensional model of welding machine welding plate is established, and the finite element numerical simulation analysis of temperature field and stress strain field in welding plate preheating process is carried out. The distribution of temperature field and stress strain field after preheating is obtained, and the correctness of the simulation results is verified by experiments, and the reasons leading to the uneven temperature distribution of the welding plate are analyzed. This paper presents a scheme for optimizing the structure of electric heating wire in solder plate of welding head mechanism, which provides data support for improving products of plastic window equipment production enterprises, and provides reference experimental data at the same time. In the actual welding process of PVC profile, the influence of welding process parameters on welding quality is particularly important. The influence of welding heating temperature parameters on welding angle strength is studied in this paper. Its existence often leads to problems such as insufficient welding angle strength and so on, which affect the strength of components. The finite element numerical simulation of the temperature field and stress field of welded joint during heating process at different welding heating temperature is carried out. The distribution of temperature field and stress field in welded joint is obtained, the variation law of maximum internal stress is obtained, the parameter optimization scheme is put forward, and the variation law of welding angle strength under different welding temperature is obtained by measuring the welding angle strength. Through the comprehensive analysis and comparison of internal stress variation law and angle strength change law, the feasibility of the proposed optimization scheme is verified, which provides a research method and theoretical reference for other welding process parameters in the future. It is advantageous for enterprises to optimize the heating temperature parameters of plastic window welding.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU532.65;TG43

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