【摘要】：伴隨著汽車工業(yè)快速發(fā)展,人們對(duì)汽車的品質(zhì)要求越來(lái)越高。汽車腐蝕損壞是影響汽車品質(zhì)的重要因素,因此,汽車的各種腐蝕防護(hù)措施就顯得越來(lái)越重要。電泳涂裝工藝是一種有機(jī)涂膜形成方法,其形成的電泳漆成膜質(zhì)量的好壞,直接決定了整車的防腐蝕性能。本文選定東風(fēng)柳州汽車有限公司某乘用車型,針對(duì)整車耐腐蝕性與車身電泳工藝進(jìn)行了以下研究:(1)分析汽車的使用環(huán)境以及腐蝕現(xiàn)狀,闡述了汽車防腐性能設(shè)計(jì)的必要性及防腐設(shè)計(jì)的主要方法,查找汽車使用過(guò)程中的腐蝕原因;(2)研究汽車防腐處理工藝中電泳涂裝的反應(yīng)機(jī)理及典型的電泳涂裝工藝,對(duì)電泳工藝耐腐蝕性能的主要影響因素進(jìn)行了講解,分析了常見(jiàn)的電泳漆膜的性能評(píng)價(jià)標(biāo)準(zhǔn)及缺陷,對(duì)各項(xiàng)電泳缺陷問(wèn)題進(jìn)行了詳細(xì)的調(diào)查及原因分析,制定了解決措施,并制定相關(guān)工藝規(guī)程及管理要求;(3)通過(guò)選用仿真軟件中VPS/EDC、VPS/Toolkit模塊對(duì)風(fēng)行汽車新車型進(jìn)行建模計(jì)算分析,模擬白車身在油漆槽中電流作用下車身上的電泳涂層的電沉積過(guò)程,在真正進(jìn)行批量生產(chǎn)之前通過(guò)對(duì)白車身的任意位置的涂層厚度結(jié)果進(jìn)行預(yù)測(cè)。結(jié)果表明這種仿真分析方法比較可靠,能夠直觀、量化的得出車身內(nèi)外表面的成膜數(shù)據(jù),也能顯示各零件的最大、最小膜厚,節(jié)省了大量的時(shí)間和成本;(4)通過(guò)實(shí)車解剖,測(cè)定膜厚,觀察電泳不上的部位,對(duì)電泳車身泳透力情況進(jìn)行全面驗(yàn)證,并對(duì)泳不上電泳漆部位原因進(jìn)行分析,主要是因?yàn)榕艢饪自O(shè)置數(shù)量不夠、孔徑過(guò)小或位置不合理導(dǎo)致局部的氣體無(wú)法排出,鈑金結(jié)構(gòu)間隙過(guò)小而產(chǎn)生電場(chǎng)屏蔽效應(yīng),并提供車身設(shè)計(jì)下一步改善的方向。
[Abstract]:With the rapid development of automobile industry, people are demanding more and more high quality of automobile. Automobile corrosion damage is an important factor affecting automobile quality. Therefore, various corrosion protection measures are becoming more and more important. Electrophoretic coating process is an organic film forming method. The quality of electrophoretic coating directly determines the anticorrosion performance of the whole vehicle. In this paper, a passenger vehicle of Dongfeng Liuzhou Automobile Co., Ltd. is selected, and the corrosion resistance and electrophoretic process of the whole vehicle are studied as follows: (1) the use environment and corrosion status of the vehicle are analyzed. This paper expounds the necessity of automobile anticorrosive performance design and the main methods of anticorrosion design, finds out the corrosion reasons in the process of automobile use, (2) studies the reaction mechanism of electrophoretic coating and typical electrophoretic coating process in automobile anticorrosive treatment process. The main factors affecting the corrosion resistance of electrophoretic process are explained, the performance evaluation standards and defects of the common electrophoretic coatings are analyzed, the problems of the electrophoretic defects are investigated and the reasons are analyzed in detail, and the solving measures are worked out. The related process rules and management requirements are established. (3) the electrodeposition process of electrophoretic coating on the white body under the action of the current in the paint tank is simulated by selecting the VPS/EDC,VPS/Toolkit module in the simulation software to model and calculate the new car model. The results of coating thickness at any position of the body are predicted before mass production. The results show that this simulation analysis method is reliable and can be used to quantify the film-forming data of the inner and outer surfaces of the body, and can also show the maximum and minimum film thickness of each part, thus saving a lot of time and cost. (4) through the actual dissection of the vehicle, Determine the thickness of the film, observe the parts not on the electrophoresis, verify the swimming permeability of the electrophoretic body comprehensively, and analyze the reasons for the location of the electrophoretic paint, mainly because the number of exhaust holes is not enough. Too small aperture or unreasonable position lead to local gas can not be discharged, sheet metal structure gap is too small to produce electric field shielding effect, and provide the direction of the next improvement of body design.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U466

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