本文關(guān)鍵詞：不同加載方式下磁性介質(zhì)輔助加壓板材成形性能研究　出處：《哈爾濱理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 板材 磁性介質(zhì) 柔性成形 成形性能 壁厚分布

【摘要】：隨著科學(xué)技術(shù)的發(fā)展,許多新的智能材料逐漸被發(fā)現(xiàn)或制造出來,其中,它們很多已經(jīng)被應(yīng)用于工業(yè)實際生產(chǎn)之中,產(chǎn)生了巨大的經(jīng)濟和社會效益。在此背景推動下,智能材料的發(fā)展為板材柔性介質(zhì)成形領(lǐng)域注入了新活力,磁性介質(zhì)是由磁導(dǎo)率較高且磁滯性較低的微納米級軟磁性顆粒、非導(dǎo)磁性液體及添加劑混合而組成的懸浮體。此種磁性介質(zhì)在零磁場情況下可呈現(xiàn)出牛頓流體的特性,而在磁場作用下能瞬間從液態(tài)轉(zhuǎn)化為半固態(tài)甚至類固態(tài),值得說明的是磁性介質(zhì)的此種轉(zhuǎn)變是瞬時可逆的。首先分析研究了智能材料磁性介質(zhì)的組分、性能特點等,購置了本次研究所需的磁性介質(zhì)。其次,提出了磁性智能介質(zhì)性能測試方法,研制了相應(yīng)的專用工裝結(jié)構(gòu)并對介質(zhì)性能進行了系統(tǒng)的測試分析。結(jié)合有限元模擬,給出了勵磁凸模直徑、通電電流及線圈匝數(shù)與磁場分布的關(guān)系,優(yōu)化得出了最佳的工藝方案。本文以304不銹鋼板為例,在不同加載方式下,系統(tǒng)研究了磁性介質(zhì)輔助加壓對板材的成形高度、成形極限及壁厚分布等的影響規(guī)律。不同磁場作用下,磁性介質(zhì)的流變特性會隨之發(fā)生變化,從而導(dǎo)致了板材在成形過程中其受力狀態(tài)、變形行為的改變。隨著電流強度的增加,同等凸模加載量情況下板件的成形高度相應(yīng)變大,其各部位減薄程度也隨之增加,且底角部減薄程度最為嚴重。隨后進行了磁性介質(zhì)雙向加壓板材成形工藝實驗,研制了背壓單元,實現(xiàn)了對板材雙側(cè)同步加載的作用。研究結(jié)果表明:當電流由0 A增至4 A時板材極限成形高度的增幅達到了18.03%;當凸模加載量為15 mm時壁厚最大減薄率由28%降至22.6%且成形高度有增大趨勢變化�？芍谠黾与娏鲝姸群螽a(chǎn)生的漸強磁場作用下,磁性介質(zhì)的加載傳力效果及粘附作用促進了板件壁厚分布及變形均勻性的改善。隨著該工藝的逐漸成熟,有望為板材柔性介質(zhì)加壓成形工藝的研究開辟一條新思路。
[Abstract]:With the development of science and technology, many new intelligent materials have been discovered or created, among them, many of them have been used in industrial production, produced a huge economic and social benefits. This background under the impetus of the development of smart materials has injected new vitality into the medium of sheet metal flexible forming field, magnetic media is made micro nano particles and high permeability soft magnetic hysteresis of the low - magnetic liquid and additive composition. The magnetic suspension medium may exhibit characteristics of Newton fluid in zero magnetic field case, and in the magnetic field can instantly from liquid into semi solid or solid, it is worth the change of magnetic medium is instantaneous reversible. The analysis of smart materials and magnetic media components, performance characteristics, acquisition of magnetic medium in this study required the. Second, the method is presented to test the performance of smart magnetic medium, developed a special structure and corresponding frock on dielectric properties were analyzed. The test system based on the finite element simulation, gives the excitation of punch diameter, through the relationship between electric current and the number of turns of the coil and the magnetic field distribution, optimization to obtain the optimal process scheme in this paper. In the 304 stainless steel plate as an example, under different loading modes, magnetic media assisted pressure forming height on board system to study the influence of forming limit and wall thickness distribution. Under different magnetic fields, the rheological properties of magnetic medium will be changed, which leads to the plate in the process of forming the stress state and the deformation behavior change. With the increase of current intensity, the same punch loading conditions of plate forming height increased, the various parts of thinning degree also increased, and the bottom of the thinning degree Serious. Followed by a magnetic medium of biaxial compression sheet forming process experiment, developed pressure unit, the realization of bilateral synchronous loading sheet. The results show that when the current increased from 0 A to 4 A sheet forming limit height reached 18.03% increase; when the punch load is 15 mm thick wall the maximum thinning rate from 28% to 22.6% and the increasing trend of forming height changes. The crescendo magnetic field produced an increase in the current strength of the magnetic medium, loading force effects and promote the adhesion of the plate wall thickness distribution and deformation uniformity is improved. As the process is expected to gradually mature, flexible sheet the research on the forming process of medium pressure opens up a new idea.

【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】：2017
【分類號】：TB381

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