叉车门架的焊接变形趋势的研究(有限元分析ANSYS)(含答辩ppt,论文说明书32000字,ansys-模拟分析,焊接分析图片)
摘要
焊接是牵涉到电弧物理、热传导、冶金和力学的复杂过程。过去，生产中的焊接变形主要凭借经验，其规律往往难以预测和控制。通常，预测焊接变形的方法是采用热弹塑性有限元法，近年来，国内外采用热弹塑性有限元法来分析焊接变形取得了很大的成功，但是这种方法往往需要大容量的计算机和很长计算时间，对于较复杂的三维焊接结构，这种方法即使可能也是不经济的。相反，焊接变形的固有应变法就可以通过较少的计算解决复杂结构的焊接变形问题，具有非常好的应用前景和实用价值。
本论文研究的是柳工CPCD30叉车外门架的焊接变形趋势。叉车外门架的焊接变形对叉车的工作性能有着重要的影响，外门架焊接总成时，主要由七个结构件的20多条焊缝焊接而成。本论文通过使用大型有限元软件ANSYS,以固有应变为理论基础较全面的对CPCD30叉车外门架总成的焊接变形进行分析，为以后叉车门架的焊接工作提供有效的参考数据。
关键词 焊接变形 CPCD30叉车外门架 固有应变 有限元
Abstract
Welding is a complex process involving electric-arc physics, heat transferring, mechanics and metallurgy. The welding appearance includes the electromagnetic welding, heat-transferring process, the metal melting and solidification, the phase-changing cooling, welding stress and deformation, and so on. Prediction and control of welding deformation is urgently settled by welding manufacturing. Formerly, the welding deformation prediction and control is usually based on experience, so that the rule of welding deformation is hardly dope out and controlled. Usually, the thermal elasto-plastic finite element method(FEM) is deal with the predition of welding deformation. Recently the thermal elasto-plastic finite element method(FEM) is developed to analyse the prediction of welding deformation, which gain certain successes, but this method requires large volume computer memory and long computational time to the sulution of large end complicated 3D welding stucture, which is not efficient and economical for the above situation. Contrally, the inherent strain FEM has great superiority in predicting large scale welding struture deformation with relatively shorter computational time, which holds well application prospects and practical value.
In this paper, which studys the trend of welding deformation of outside door frame of Liugong CPCD30 forklifts. Welding deformation of forklifts’ outside door frame has great impact to capability of forklifts. The outside door frame of forklift assembly is made up of seven strutural frame with more than 20 welds. The paper adopt generic large-scale finite element software(ansys) to analyse welding deformation based on the theory of inherent strain, which provides effective referenced data for welding henceforth in the future.
Keywords welding deformation, CPCD30 outside door frame, inherent strain, finite element method (FEM)
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