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  本文關(guān)鍵詞： 微拉深 盒形件 本構(gòu)模型 有限元分析 微模具設(shè)計　出處：《大連海事大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著微機械及微機電系統(tǒng)的發(fā)展,微零件需求量逐漸增加,微拉深成形技術(shù)以其高效率、低成本及可實現(xiàn)大批量生產(chǎn)等優(yōu)點關(guān)注度逐漸升高,但微拉深成形屬于微觀尺度下塑性變形,其成形理論及生產(chǎn)經(jīng)驗不成熟,制約了微拉深成形技術(shù)的應(yīng)用。微拉深工藝可成形各類腔體,多種因素影響其復雜的成形工藝,現(xiàn)有研究成果多局限于回轉(zhuǎn)體,而盒形件微拉深成形相關(guān)研究較少。本文以盒形件為研究對象,采用數(shù)值模擬的方法對其微拉深成形進行分析,確定成形規(guī)律的影響因素,并以此為依據(jù),設(shè)計出成形盒形件的微拉深模具。針對微成形中特有的尺度效應(yīng)現(xiàn)象,在對現(xiàn)有體現(xiàn)尺度效應(yīng)的本構(gòu)理論進行整理分析的基礎(chǔ)上,對表面層模型進行修正,推導出適用于面心或體心立方晶格材料的本構(gòu)關(guān)系。在此基礎(chǔ)上,對微拉深成形試驗進行有限元數(shù)值模擬,通過模擬結(jié)果與試驗結(jié)果對比分析,驗證該修正表面層模型的合理性。將修正表面層模型應(yīng)用到盒形件微拉深成形有限元分析中,以工件、模具及成形工藝等參數(shù)為變量因素進行對比分析。分析結(jié)果表明:盒形件在微拉深成形中圓角與直邊成形會相互影響,與傳統(tǒng)拉深成形過程類似;板料材料晶粒尺度會影響微拉深力及工件成形厚度的變化,存在尺度效應(yīng);模具間隙、凸模圓角及模具零件加工質(zhì)量均會影響微拉深力的變化趨勢;沖壓速度對微拉深力的影響較小。研究盒形件微拉深的成形規(guī)律對其機理研究、工藝設(shè)計及模具設(shè)計具有一定的指導意義�；谟邢拊治鼋Y(jié)果,結(jié)合盒形件微拉深加工尺寸小、形狀特殊等特點,對模具凸、凹模尺寸等參數(shù)進行優(yōu)化計算,設(shè)計出一套微拉深模具。為避免手工送料與卸料對毛坯和工件的影響,設(shè)計出自動送料機構(gòu)與彈性自動卸料機構(gòu)。通過運動仿真證明模具結(jié)構(gòu)合理、運動無干涉,可為同類型微模具設(shè)計提供參考。
[Abstract]:With the development of micro machinery and micro electromechanical system, the demand for micro parts is increasing gradually, and the attention of micro drawing technology is increasing because of its high efficiency, low cost and the ability to realize mass production. However, micro-drawing forming belongs to micro-scale plastic deformation, and its forming theory and production experience are not mature, which restricts the application of micro-drawing technology. Micro-drawing process can form all kinds of cavities. Many factors affect the complex forming process, and most of the existing research results are confined to the rotary body, but the research on the box micro-drawing forming is less. This paper takes the box as the research object. The method of numerical simulation is used to analyze the micro-drawing forming, and the influencing factors of forming law are determined, which is based on it. According to the special scale effect phenomenon in microforming, the surface layer model is modified on the basis of the analysis of the existing constitutive theory which embodies the scale effect. On the basis of this, the finite element numerical simulation of micro-drawing forming test is carried out, and the simulation results are compared with the experimental results. To verify the rationality of the modified surface layer model, the modified surface layer model is applied to the finite-element analysis of micro-drawing forming of box-shaped parts. The parameters such as die and forming process are compared and analyzed. The results show that the circular corner and straight edge forming of box parts in micro-drawing will interact with each other, which is similar to the traditional drawing process. The grain size of sheet metal will affect the variation of micro-drawing force and forming thickness of workpiece, and there is a scale effect. The change trend of micro-drawing force will be affected by die clearance, punch fillet and machining quality of die parts. The influence of stamping speed on the micro-drawing force is small. The research on the forming law of box micro-drawing has a certain guiding significance for its mechanism research, process design and die design. Based on the results of finite element analysis. Combined with the characteristics of small dimension and special shape of the box parts, the parameters such as die convex and die size are optimized and calculated. In order to avoid the influence of manual feeding and unloading on blank and workpiece, the automatic feeding mechanism and elastic automatic unloading mechanism are designed. The motion has no interference and can provide reference for the design of the same type of micromould.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG38

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本文編號：1471707