本文選題：激光沖擊成形 + 金屬箔板��； 參考：《江蘇大學》2017年碩士論文

【摘要】：隨著生物醫(yī)療器械和微機電系統(tǒng)的迅猛發(fā)展,產品的精密化和微型化成為了工業(yè)制造發(fā)展的一個重要趨勢,而在精密微器械的制造過程中離不開異種輕質材料的耦合使用,因此微制造業(yè)迫切需要可以連接異種箔板材料的高效微連接技術。本文結合激光沖擊成形技術和無鉚釘鉚接技術提出了一種激光間接沖擊金屬箔板剪切微鉚接新工藝,旨在實現微尺度下同種或異種金屬箔板的連接,以擴大基于材料塑性變形的連接技術的應用范圍。本工藝采用脈沖激光代替?zhèn)鹘y(tǒng)微沖頭,利用軟膜作為沖擊壓力的傳遞媒介,結合微細電火花加工的微凹模完成微尺度下金屬箔板的鉚接過程。本文從基礎理論、可行性分析、工藝參數三個方面對激光間接沖擊金屬箔板剪切微鉚接工藝進行了研究:首先,研究了激光與物質之間相互作用產生等離子體的機理,確立了沖擊波峰值壓力的數學模型;討論了軟膜和工件之間的阻抗匹配;探討了高應變率下材料的塑性變形屈服條件;研究了傳統(tǒng)剪切鉚接技術中連接點的形成過程和連接機理。其次,進行了激光間接沖擊金屬箔板剪切微鉚接工藝的可行性實驗研究。實驗結果表明:單次脈沖下無法形成較大內鎖,需要使用多次脈沖激光并結合適中的激光能量才能解決該問題;材料組合總厚度與模具深度之間存在匹配關系,隨著總厚度的增加,能夠使其形成較大內鎖的模具深度也相應增大;本工藝更適合連接上板厚于下板的材料組合;在可形成內鎖的激光能量區(qū)間內,隨著激光能量的增大,兩層金屬箔板之間的內鎖尺寸逐漸增大,而上層箔板的最小厚度逐漸減小;相同的板厚條件下,Al/SS材料組合的拉伸強度最高,約為Al/Cu與Cu/Cu材料組合的三倍;另外,Cu/Cu、Al/Cu、Al/SS三種材料組合經過拉伸剪切實驗后的失效形式各不相同,分別為:下板部分剪切、完全脫扣以及上板部分剪切。最后,采用脈沖激光能量更大的激光器驗證了該工藝在連接較厚箔板時的適用性,改進了激光間接沖擊金屬箔板剪切微鉚接工藝的實驗系統(tǒng),研究了新系統(tǒng)中工藝參數對金屬箔板連接效果的影響,通過拉伸剪切實驗探討了內鎖尺寸和上板頸部厚度對拉伸強度及其失效模型的影響,通過納米壓痕實驗測試了連接點處上下層金屬箔板納米硬度的變化。實驗結果表明:吸收層厚度對箔板的材料流動和內鎖的形成有很大影響,實驗中可根據所使用激光能量的大小來選取最優(yōu)的吸收層厚度;相比其余厚度的軟膜,厚度為100μm的軟膜更適合激光間接沖擊金屬箔板剪切微鉚接工藝;在單層板厚小于200μm的范圍內,本工藝的最優(yōu)模具深度可由近似80%的上板厚度與下板厚度相加得到;連接點的拉伸強度及其失效模型都取決于內鎖尺寸和上板頸部厚度,連接點只有同時具備較大的內鎖尺寸和較大的上板頸部厚度才能具有較高的連接強度;經過激光沖擊后連接點處的材料納米硬度都有所提高,且材料塑性變形程度越大的區(qū)域其相應的納米硬度越高。本文研究為微尺度下金屬箔板的連接提供了新途徑并為進一步應用奠定了理論基礎。
[Abstract]:With the rapid development of biological medical instruments and microelectromechanical systems, the precision and miniaturized production of products is an important trend for the development of industrial manufacturing. In the manufacturing process of precision micro devices, the coupling of different light materials can not be used. Therefore, the micro manufacturing industry is urgently required to connect the high efficiency micro connection of the dissimilar foil material. In this paper, a new technology of laser indirect impact metal foil plate shearing micro riveting is proposed by laser shock forming technology and riveting without riveting. The purpose is to realize the connection of the same or dissimilar metal foil in the micro scale, so as to expand the application range of the connection technology based on the plastic deformation of the material. The micro punch, using the soft film as the transmission medium of the impact pressure, combined with micro EDM micro die to complete the riveting process of the metal foil on the micro scale. This paper has studied the laser indirect impact metal foil plate shearing micro riveting process from three aspects: basic theory, feasibility analysis and process parameters. First, the laser is studied. The mechanism of plasma interaction with matter is produced, the mathematical model of the peak pressure of shock wave is established, the impedance matching between the soft film and the workpiece is discussed, the yield condition of the plastic deformation under the high strain rate is discussed, the forming process and the connection mechanism of the connection point in the traditional shear riveting technology are studied. Secondly, it has been carried out. The experimental study on the micro riveting process of laser indirect impact metal foil plate is studied. The experimental results show that a large internal lock can not be formed under a single pulse. It is necessary to use multiple pulse lasers and moderate laser energy to solve the problem. The total thickness of the material has a matching relationship with the depth of the die, and the total thickness increases with the total thickness. With the increase of laser energy, the internal lock size between two layers of foil plates increases gradually with the increase of laser energy, and the minimum thickness of the upper foil plate decreases gradually; the same is the same. Under the condition of plate thickness, the tensile strength of Al/SS composite is the highest, about three times the combination of Al/Cu and Cu/Cu. In addition, the failure forms of the three kinds of material combinations of Cu/Cu, Al/Cu and Al/SS are different after the tensile shear test, respectively: the partial shear of the lower plate, the complete release and the partial shear of the upper plate. Finally, the pulse laser energy is greater. The laser verified the applicability of the technology in connecting the thick foil plate, improved the experimental system of the laser indirect impact metal foil plate shearing micro riveting, and studied the effect of the process parameters on the bonding effect of the metal foil plate. The tensile shear test was used to explore the tensile strength and the tensile strength of the inner lock and the thickness of the upper plate. The results show that the thickness of the absorption layer has a great influence on the material flow and the formation of the internal lock. In the experiment, the optimum thickness of the absorption layer can be selected according to the size of the laser energy used in the experiment, and the thickness of the absorption layer can be selected in the experiment. The soft film with the thickness of 100 mu m is more suitable for the laser indirect impact metal foil plate shear micro riveting process. The optimum die depth of this process can be obtained by adding approximately 80% of the thickness of the upper plate and the thickness of the lower plate in the range of less than 200 mu, and the tensile strength and failure model of the connection point depend on the size and the upper of the internal lock. The thickness of the plate neck, the connection point only with the larger internal lock size and the larger plate neck thickness can have higher connection strength. After the laser shock, the nanoscale hardness of the material at the connection point is improved, and the higher the plastic deformation degree of the material, the higher the hardness of the nanoscale. This paper is a micro scale. The connection of metal foil provides a new way and lays a theoretical foundation for further application.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG665;TG938

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