本文關(guān)鍵詞： 激光透射焊接 相容性 焊接強度 工藝優(yōu)化 溫度場　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：激光透射焊接技術(shù)以其焊接效率高、焊接質(zhì)量好、殘余應(yīng)力小、易于控制等優(yōu)點,廣泛應(yīng)用于醫(yī)療器械、汽車零部件、電子器件產(chǎn)品和包裝工業(yè)等領(lǐng)域。然而,由于異種聚合物材料之間的相容性比同種材料的相容性差,導(dǎo)致異種材料的激光透射焊接強度不是很高,所以需要進(jìn)一步研究。本文選用PMMA(聚甲基丙烯酸甲酯)和PBT(聚對苯二甲酸丁二醇酯)作為激光透射焊接的上下層材料。這兩者相容性較差,焊接強度低。本文通過在激光透射焊接PMMA和PBT中間添加一層PC(聚碳酸酯)薄膜,來增強兩者的焊接強度,探究材料之間的可焊性機理,并對焊接工藝和溫度場的數(shù)值模擬進(jìn)行研究。首先,根據(jù)激光吸收面的選擇和薄膜厚度的選擇實驗來選擇激光吸收面和薄膜厚度;在激光透射焊接實驗中,通過對比有無PC薄膜焊接件的焊接強度,發(fā)現(xiàn),添加PC薄膜作為中間層的焊接件的焊接強度可達(dá)到?jīng)]有PC薄膜的焊接件的焊接強度4倍左右。其次,從微觀角度,激光透射焊接有PC薄膜作為中間層的PMMA與PBT的焊縫區(qū)的氣泡比直接激光透射焊接PMMA與PBT的焊縫區(qū)的氣泡多,在一定程度上,氣泡在焊縫區(qū)域可以形成微鉚接來提高焊接強度;根據(jù)流變實驗的結(jié)果和蠕動模型來分析計算PMMA、PC和PBT的蠕動時間,發(fā)現(xiàn)三個時間都處于毫秒級別,PMMA的蠕動時間最大,PBT的蠕動時間最小,通常蠕動時間比材料熔融狀態(tài)的時間越小,焊接強度就越高,這可以得出PC與PBT的焊接強度比PMMA與PC的焊接強度高;通過計算平衡界面寬度以及相對焊接能力,得出PMMA與PBT的焊接能力差,而PMMA與PC、PC與PBT的焊接能力相對高一點,也說明了添加PC薄膜層提高焊接PMMA與PBT焊接強度的可焊性機理。隨后,通過旋轉(zhuǎn)中心復(fù)合設(shè)計法(CCRD)對實驗進(jìn)行設(shè)計與規(guī)劃,采用響應(yīng)曲面方法(RSM)構(gòu)建了添加PC薄膜作為中間層的激光透射PMMA和PBT焊接件的焊接強度與各個工藝參數(shù)之間的數(shù)學(xué)分析模型,分析了各個工藝參數(shù)對焊接強度的交互影響,并根據(jù)目標(biāo)優(yōu)化標(biāo)準(zhǔn)對工藝參數(shù)進(jìn)行了優(yōu)化。最后,建立激光透射焊接有PC薄膜作為中間層的PMMA與PBT的焊接界面處的溫度場有限元模型,得到焊接界面處溫度場的變化規(guī)律;發(fā)現(xiàn)兩個界面處的模擬焊縫寬度值隨工藝參數(shù)的變化而變化的趨勢基本保持一致。通過對比焊縫寬度的實驗值和模擬值來驗證模型的可靠性。本文為研究相容性較差的異種聚合物的激光透射焊接提供一種新途徑,并為激光透射焊接添加薄膜的PMMA和PBT奠定理論基礎(chǔ)。
[Abstract]:Laser transmission welding technology is widely used in medical devices, automobile parts, electronic devices and packaging industry because of its high welding efficiency, good welding quality, low residual stress, easy control and so on. The miscibility of heterogeneous polymer materials is worse than that of the same materials, so the laser transmission welding strength of dissimilar materials is not very high. In this paper, PMMA (polymethyl methacrylate) and PBT (polybutylene terephthalate) are selected as the upper and lower layers of laser transmission welding. The welding strength is low. In this paper, the welding strength of PMMA and PBT is enhanced by adding a layer of PC-film between laser transmission welding and PBT, and the solderability mechanism between the two materials is explored. The numerical simulation of welding process and temperature field is also studied. Firstly, the laser absorption surface and film thickness are selected according to the selection of laser absorption surface and film thickness. By comparing the welding strength of the welded parts with or without PC thin film, it is found that the welding strength of the welded parts with PC film as the intermediate layer is about 4 times that of the welding parts without PC film. Secondly, from the microscopic point of view, In laser transmission welding, there are more bubbles in the weld zone of PMMA and PBT with PC film as the interlayer than in the weld zone of direct laser transmission welding with PMMA and PBT. To a certain extent, the bubbles can form micro-riveting in the weld zone to improve the welding strength. According to the results of rheological experiments and creep model, the creeping time of PMMA-PC and PBT is analyzed and calculated. It is found that all three times are in the millisecond level, the maximum peristaltic time of PMMA-PBT is the smallest, and the peristaltic time is usually smaller than that of the melting state of the material. The higher the welding strength, the higher the welding strength of PC and PBT is than that of PMMA and PC. By calculating the width of balance interface and the relative welding ability, it is concluded that the welding ability of PMMA and PBT is poor. However, the weldability of PMMA and PC-PC and PBT is relatively high, which also explains the solderability mechanism of adding PC film layer to improve the welding strength of PMMA and PBT. Then, the experiment is designed and planned by the method of rotating center composite design. A mathematical analysis model of laser transmitted PMMA and PBT welds with PC film as intermediate layer was constructed by using response surface method (RSM), and the interaction between each process parameter and welding strength was analyzed. Finally, the finite element model of the temperature field at the interface of PMMA and PBT with PC film as the interlayer is established, and the variation of the temperature field at the interface is obtained. It is found that the variation trend of the simulated weld width at the two interfaces is basically consistent with the change of the process parameters. The reliability of the model is verified by comparing the experimental and simulated weld width values. Laser transmission welding of poor dissimilar polymers provides a new way. It also lays a theoretical foundation for PMMA and PBT of laser transmission welding.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG456.7

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