本文選題：塑窗焊接機(jī)構(gòu)　切入點：有限元分析　出處：《濟(jì)南大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：PVC塑窗是國家重點推廣的節(jié)能建筑產(chǎn)品,焊接加工是塑窗組裝中的重要工序之一,其加工質(zhì)量與效率直接影響門窗的生產(chǎn)。由于目前缺少對塑窗焊接機(jī)焊接工況下工藝參數(shù)影響規(guī)律的研究,塑窗加工設(shè)備的焊接技術(shù)水平受到了制約。在總結(jié)國內(nèi)外塑窗焊接研究現(xiàn)狀的基礎(chǔ)上,根據(jù)塑窗焊接機(jī)焊接機(jī)理及塑窗型材特有的熱力學(xué)性能,通過計算機(jī)數(shù)值模擬仿真的方法,采用三維建模技術(shù)對焊接機(jī)焊板結(jié)構(gòu)及型材焊接接頭建立三維模型,運(yùn)用有限元分析軟件ANSYS對焊板預(yù)熱及型材加熱過程中的溫度場、熱應(yīng)力應(yīng)變場進(jìn)行了數(shù)值模擬分析。采用實驗方法驗證了有限元仿真計算結(jié)果的正確性,并針對企業(yè)實際焊接過程中出現(xiàn)的問題,探索性提出了一種焊板內(nèi)電熱絲結(jié)構(gòu)優(yōu)化改進(jìn)方案,得到不同焊接加熱溫度下對焊接熱應(yīng)力的影響規(guī)律。 針對焊接過程中出現(xiàn)的焊板溫度場分布不均勻問題,建立了焊接機(jī)焊板三維模型并進(jìn)行了焊板預(yù)熱過程中的溫度場、應(yīng)力應(yīng)變場的有限元數(shù)值模擬仿真分析,獲得了焊板預(yù)熱后的溫度場、應(yīng)力應(yīng)變場分布規(guī)律,并通過實驗驗證了仿真結(jié)果的正確性。通過分析導(dǎo)致焊板溫度分布不均的原因,探索性提出了一種焊頭機(jī)構(gòu)焊板內(nèi)部電熱絲的結(jié)構(gòu)優(yōu)化方案,為塑窗設(shè)備生產(chǎn)企業(yè)改進(jìn)產(chǎn)品提供數(shù)據(jù)支持,同時提供可參考的實驗數(shù)據(jù)。 在PVC型材實際焊接過程中,焊接工藝參數(shù)對焊接質(zhì)量的影響尤為重要,論文研究了焊接加熱溫度參數(shù)對焊接角強(qiáng)度的影響規(guī)律。由于焊接加熱溫度的不同導(dǎo)致焊接接頭內(nèi)部產(chǎn)生不同的內(nèi)應(yīng)力,它的存在往往導(dǎo)致焊后型材出現(xiàn)焊接角強(qiáng)度不足等問題,影響構(gòu)件的強(qiáng)度。對焊接接頭在不同焊接加熱溫度下加熱過程中的溫度場與應(yīng)力場進(jìn)行了有限元數(shù)值仿真模擬,獲得了焊接接頭處溫度場與應(yīng)力場分布狀況,得到了最大內(nèi)應(yīng)力的變化規(guī)律,提出了參數(shù)優(yōu)化方案。通過焊接角強(qiáng)度測量實驗得到了不同焊接溫度下焊角強(qiáng)度的變化規(guī)律,通過內(nèi)應(yīng)力變化規(guī)律與角強(qiáng)度變化規(guī)律的綜合分析與對比,驗證了所提出的工藝參數(shù)優(yōu)化方案的可行性。為以后進(jìn)行其他的焊接工藝參數(shù)的研究提供研究方法與理論參考,有利于企業(yè)對塑窗焊接的加熱溫度工藝參數(shù)的優(yōu)化選擇。
[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.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU532.65;TG43

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