本文關(guān)鍵詞： 異質(zhì)板材 嵌入式 冷壓變形連接 連接強度 連接質(zhì)量　出處：《哈爾濱理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會的不斷進步與發(fā)展，環(huán)保等問題受到的關(guān)注與日俱增。在追求節(jié)能減排等實效的驅(qū)動下，大量的新型材料或結(jié)構(gòu)被航空航天、汽車制造等領(lǐng)域廣泛采用。異質(zhì)材料連接作為實現(xiàn)輕量化的主要途徑之一逐漸成為研究者們共同關(guān)注的焦點，與激光焊、攪拌摩擦焊等方法相比，螺紋連接、鉚接和沖壓連接等機械連接方法在解決異質(zhì)板材連接過程中存在的板厚差異大、層數(shù)多等瓶頸問題中更具優(yōu)勢。 為了進一步提高異質(zhì)板材連接的法向承載能力及可靠性，本文提出了嵌入式板材冷壓變形連接法即對連接部位整體加載作用后，一側(cè)板材受壓變形后嵌入到對側(cè)板材的預(yù)制孔中形成互鎖連接結(jié)構(gòu)。并設(shè)計了搭接-嵌入式、交互-嵌入式和插孔-嵌入式等三種不同的接頭結(jié)構(gòu)方案，以工業(yè)純鋁1100與304不銹鋼板為例，利用萬能材料試驗機進行連接實驗及連接強度測試。 本文首先確定了異質(zhì)板材冷壓變形連接過程可分為三個主要階段：調(diào)整階段、壓合階段和嵌入階段，結(jié)合各階段的變形連接特征揭示了其主導(dǎo)的因素并加以深入闡述；然后研究了加載壓力、預(yù)制孔型和沖頭壓下量等對異質(zhì)板材冷壓變形連接過程及連接質(zhì)量等方面的影響。其中，，利用有限元模擬分析了不同方案連接過程中的兩板材接頭部位的塑性變形特征、金屬流動行為和嵌入充填行為等規(guī)律；又借助工藝實驗研究了板材連接部位的宏觀形貌、寬度及厚度變化并進行了工藝優(yōu)化，結(jié)合具體工藝條件分析確定失效形式及內(nèi)因機理。 上述研究結(jié)果表明，不同方案連接過程中鋁板在加載壓力作用下均有向不銹鋼板預(yù)制孔內(nèi)產(chǎn)生充填流動并嵌入其中的趨勢。同時，連接部位的厚度均為從對稱面處向兩側(cè)依次遞減且與加載壓力呈反比關(guān)系變化。經(jīng)三種冷壓變形連接方案連接強度的對比可得知，插孔-嵌入式方案明顯高于其它兩種方案。
[Abstract]:With the continuous progress and development of the society, environmental protection issues are getting more and more attention. Driven by the pursuit of energy saving and emission reduction, a large number of new materials or structures have been aerospace, Heterogeneity material connection as one of the main ways to achieve lightweight has gradually become the focus of attention of researchers. Compared with laser welding, friction stir welding and other methods, thread connection, The mechanical connection methods such as riveting and punching are more advantageous in solving the bottleneck problems such as large difference in thickness and number of layers in the process of heterogeneous plate joining. In order to further improve the normal bearing capacity and reliability of the heterogeneity plate connection, this paper proposes an embedded plate cold-pressing deformation connection method, that is, after the integral loading of the connection site, After compression deformation, one side plate is embedded into the prefabricated hole of the opposite side plate to form interlocking connection structure. Three different joint structure schemes are designed: lap-embedded, interactive-embedded and Jack-embedded. Taking the industrial pure aluminum 1100 and 304 stainless steel plate as an example, the connection experiment and the joint strength test were carried out by using universal material testing machine. In this paper, we first determine that the process of cold-pressing deformation of heterogeneous plates can be divided into three main stages: the adjustment stage, the compression stage and the embedded stage. Combined with the deformation and connection characteristics of each stage, the dominant factors are revealed and explained deeply. Then, the effects of loading pressure, preform pass and punch reduction on the connection process and connection quality of heterostructure sheet are studied. The plastic deformation characteristics, metal flow behavior and embedded filling behavior of the joint of two plates are analyzed by finite element simulation, and the macroscopic morphology of the joint is studied by means of technological experiments. The width and thickness of the process were optimized, and the failure form and internal mechanism were determined by analyzing the specific process conditions. The results show that under the loading pressure, the aluminum plate has the tendency of filling flow and embedding in the prefabricated hole of stainless steel plate during the connection process of different schemes. The thickness of the connection site decreases from the symmetrical plane to the two sides in turn and is inversely proportional to the loading pressure. Through the comparison of the connection strength of the three cold compression deformation connection schemes, it can be seen that the Jack embedded scheme is obviously higher than the other two schemes.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG457.19

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