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

【摘要】：隨著生物醫(yī)療器械和微機(jī)電系統(tǒng)的迅猛發(fā)展,產(chǎn)品的精密化和微型化成為了工業(yè)制造發(fā)展的一個(gè)重要趨勢,而在精密微器械的制造過程中離不開異種輕質(zhì)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(shù)。本文結(jié)合激光沖擊成形技術(shù)和無鉚釘鉚接技術(shù)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(shí)現(xiàn)微尺度下同種或異種金屬箔板的連接,以擴(kuò)大基于材料塑性變形的連接技術(shù)的應(yīng)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(jié)合微細(xì)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(chǔ)理論、可行性分析、工藝參數(shù)三個(gè)方面對(duì)激光間接沖擊金屬箔板剪切微鉚接工藝進(jìn)行了研究:首先,研究了激光與物質(zhì)之間相互作用產(chǎn)生等離子體的機(jī)理,確立了沖擊波峰值壓力的數(shù)學(xué)模型;討論了軟膜和工件之間的阻抗匹配;探討了高應(yīng)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(shù)中連接點(diǎn)的形成過程和連接機(jī)理。其次,進(jìn)行了激光間接沖擊金屬箔板剪切微鉚接工藝的可行性實(shí)驗(yàn)研究。實(shí)驗(yàn)結(jié)果表明:單次脈沖下無法形成較大內(nèi)鎖,需要使用多次脈沖激光并結(jié)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(guān)系,隨著總厚度的增加,能夠使其形成較大內(nèi)鎖的模具深度也相應(yīng)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(nèi)鎖的激光能量區(qū)間內(nèi),隨著激光能量的增大,兩層金屬箔板之間的內(nèi)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(qiáng)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(jīng)過拉伸剪切實(shí)驗(yàn)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(yàn)證了該工藝在連接較厚箔板時(shí)的適用性,改進(jìn)了激光間接沖擊金屬箔板剪切微鉚接工藝的實(shí)驗(yàn)系統(tǒng),研究了新系統(tǒng)中工藝參數(shù)對(duì)金屬箔板連接效果的影響,通過拉伸剪切實(shí)驗(yàn)探討了內(nèi)鎖尺寸和上板頸部厚度對(duì)拉伸強(qiáng)度及其失效模型的影響,通過納米壓痕實(shí)驗(yàn)測試了連接點(diǎn)處上下層金屬箔板納米硬度的變化。實(shí)驗(yàn)結(jié)果表明:吸收層厚度對(duì)箔板的材料流動(dòng)和內(nèi)鎖的形成有很大影響,實(shí)驗(yàn)中可根據(jù)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(nèi),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(diǎn)的拉伸強(qiáng)度及其失效模型都取決于內(nèi)鎖尺寸和上板頸部厚度,連接點(diǎn)只有同時(shí)具備較大的內(nèi)鎖尺寸和較大的上板頸部厚度才能具有較高的連接強(qiáng)度;經(jīng)過激光沖擊后連接點(diǎn)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(yīng)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(jìn)一步應(yīng)用奠定了理論基礎(chǔ)。
[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(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG665;TG938

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張?jiān)?何曉聰;盧毅;王醫(yī)鋒;;鈦合金壓印接頭熱處理前后靜態(tài)失效機(jī)理分析[J];材料導(dǎo)報(bào);2015年16期

2 張?jiān)?何曉聰;王醫(yī)鋒;盧毅;;基于試驗(yàn)和數(shù)值模擬的鈦合金異種材料壓印連接研究[J];熱加工工藝;2015年15期

3 張?jiān)?何曉聰;王醫(yī)鋒;盧毅;;鈦合金同種和異種板材壓印連接研究[J];熱加工工藝;2015年09期

4 劉福龍;何曉聰;曾凱;王醫(yī)鋒;趙倫;;局部熱處理對(duì)壓印接頭力學(xué)性能的影響分析[J];熱加工工藝;2014年14期

5 楊慧艷;何曉聰;丁燕芳;曾凱;;鋁合金壓印接頭的強(qiáng)度研究[J];應(yīng)用力學(xué)學(xué)報(bào);2014年02期

6 楊慧艷;何曉聰;周森;曾凱;丁燕芳;;Al5052壓印接頭與材料力學(xué)性能的對(duì)比研究[J];熱加工工藝;2013年19期

7 鄭俊超;何曉聰;唐勇;竇煒;;壓印接頭力學(xué)分析及預(yù)成角對(duì)接頭強(qiáng)度的影響研究[J];材料導(dǎo)報(bào);2012年24期

8 馮模盛;何曉聰;嚴(yán)柯科;張玉濤;;壓印連接工藝過程的數(shù)值模擬及實(shí)驗(yàn)研究[J];科學(xué)技術(shù)與工程;2011年23期

9 陳根余;梅麗芳;張明軍;劉旭飛;王祖建;;激光焊接、切割在汽車制造中的應(yīng)用[J];激光與光電子學(xué)進(jìn)展;2009年09期

10 唐靖林;曾大本;;面向汽車輕量化材料加工技術(shù)的現(xiàn)狀及發(fā)展[J];金屬加工(熱加工);2009年11期

相關(guān)碩士學(xué)位論文 前4條

1 周璐瑤;基于耐撞性無鉚釘鉚接接頭建模方法研究[D];吉林大學(xué);2014年

2 彭松;AZ31鎂合金板件壓力連接技術(shù)研究[D];華南理工大學(xué);2012年

3 陳怡星;脈沖激光表面微造型的數(shù)值模擬與實(shí)驗(yàn)研究[D];江蘇大學(xué);2007年

4 劉亞麗;無鉚釘連接技術(shù)研究及有限元模擬[D];南京航空航天大學(xué);2005年

，

本文編號(hào)：2063910