發(fā)布時間：2018-06-13 15:19

  本文選題：熱成形 + 熱力耦合��； 參考：《上海應用技術大學》2017年碩士論文

【摘要】：高強度板料沖壓成形是一個極其復雜的物理過程,在板料成形時,高強度鋼板在沖壓過程中比普通鋼板更易產(chǎn)生破裂、起皺和回彈等現(xiàn)象。高強度鋼板的成形過程是一個高度多元化動態(tài)過程。隨著鋼板強度的提高,其抗變形能力增強,所需的成形力較大,鋼板的成形性能較差,容易破裂且回彈大,很難保證零件的精度要求。對于一些復雜的零配件,傳統(tǒng)冷沖壓工藝得到的工件精度難以保證。由此就引導研究出了熱沖壓成形技術。熱沖壓成形技術主要應用于高強度鋼板的沖壓成形。是一種將板料的成形與淬火同時進行的沖壓成形技術。熱沖壓成形后得到的工件普遍應用于汽車行業(yè),其強度高、滿足強度需求的情況下質(zhì)量輕、耐沖擊性能好。相比于冷沖壓成形工藝,熱成形具有成形性能好、精度高、能生產(chǎn)復雜零配件的優(yōu)點。為了準確地進行金屬板材的熱沖壓成形過程,避免長時間的試模和修模,降低生產(chǎn)成本,可以采用大型有限元分析軟件進行仿真模擬。本研究以熱沖壓成形中常用的簡單工件U型件為研究對象,采用有限元分析軟件進行數(shù)值模擬,通過與實驗分析相結(jié)合對U型件的熱沖壓成形進行深入的研究,建立U型件熱力耦合沖壓成形有限元模型及冷沖壓有限元模型,進而研究改變板料初始成形溫度、成形速度和保壓時間等對板料成形性能的影響機理,研究模具間隙、板料厚度及材料性能對冷沖壓成形回彈影響。提出減小冷成形回彈參考方法,探討熱沖壓成形過程中如何協(xié)同控制板料初始成形溫度、成形速度和保壓時間等關鍵工藝參數(shù)的變化,確定優(yōu)化方案,實現(xiàn)金屬板料的控形控性一體化成形,得到符合生產(chǎn)實際需求的工件。
[Abstract]:High strength sheet metal stamping is an extremely complex physical process. During sheet metal forming, high strength steel sheet is more prone to crack, wrinkle and springback than ordinary steel sheet. The forming process of high strength steel plate is a highly diversified dynamic process. With the improvement of the strength of the steel plate, the deformation resistance of the steel plate is enhanced, and the forming force required is large. The forming property of the steel plate is poor, easy to break and the springback is large, so it is difficult to ensure the precision of the parts. For some complicated parts, the precision of the workpiece obtained by traditional cold stamping process is difficult to guarantee. Thus the hot stamping forming technology is developed. Hot stamping technology is mainly used in high-strength steel sheet forming. Is a sheet metal forming and quenching at the same time stamping forming technology. The workpiece obtained by hot stamping is widely used in automobile industry, which has high strength, light quality and good impact resistance. Compared with cold stamping process, hot forming has the advantages of good forming performance, high precision and the ability to produce complex parts. In order to accurately carry out the hot stamping process of metal sheet, avoid long trial and repair of die, and reduce the production cost, a large finite element analysis software can be used for simulation and simulation. In this study, the simple workpiece U-shaped which is commonly used in hot stamping forming is taken as the research object, and the numerical simulation is carried out by using finite element analysis software, and the hot stamping forming of U-shaped workpiece is deeply studied by combining with the experimental analysis. The finite element model of U-shaped thermo-mechanical stamping forming and cold stamping finite element model are established, and the influence mechanism of changing the initial forming temperature, forming speed and holding time of sheet metal on sheet metal forming performance is studied, and the die clearance is studied. The effect of sheet thickness and material properties on springback of cold stamping. This paper presents a method to reduce springback of cold forming, discusses how to control the change of key process parameters such as initial forming temperature, forming speed and holding time of sheet metal in hot stamping process, and determines the optimization scheme. The shape control and controlling forming of metal sheet is realized, and the workpiece that meets the actual production requirement is obtained.
【學位授予單位】：上海應用技術大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG386

【參考文獻】

相關期刊論文 前10條

1 周健;;關于金屬學中超塑性變形教學內(nèi)容的幾點思考[J];教育教學論壇;2016年46期

2 梁繼才;李義;高嵩;滕菲;;型材多點柔性拉彎成形回彈預測[J];吉林大學學報(工學版);2017年01期

3 吳斌;曹志福;;超高強鋼板U形件熱沖壓回彈研究[J];熱加工工藝;2016年11期

4 郭春紅;陶忠;張品樂;;ABAQUS顯式算法的準靜態(tài)加速分析方法研究[J];低溫建筑技術;2015年08期

5 閆華;張培磊;于治水;;改性高錳鋼裂紋萌生與擴展的原位拉伸研究[J];熱加工工藝;2014年02期

6 雷呈喜;崔俊佳;邢忠文;古田;趙浩;;高強鋼盒形件熱沖壓成形組織預測[J];塑性工程學報;2012年06期

7 馬寧;申國哲;張宗華;孫宏圖;胡平;;高強度鋼板熱沖壓材料性能研究及在車身設計中的應用[J];機械工程學報;2011年08期

8 賈書偉;何承源;;行(列)轉(zhuǎn)置矩陣的性質(zhì)[J];內(nèi)江師范學院學報;2011年02期

9 馬寧;胡平;胡平;翟述基;郭威;;高強度鋼板熱成形技術及其工程實現(xiàn)[J];汽車工藝與材料;2009年12期

10 徐偉力;管曙榮;艾健;羅愛輝;;鋼板熱沖壓新技術介紹[J];塑性工程學報;2009年04期

相關博士學位論文 前2條

1 付澤民;高強度金屬板多道次漸進折彎成形及回彈研究[D];華中科技大學;2010年

2 倪正順;鋁熱擠壓模具熱力耦合數(shù)值分析與結(jié)構(gòu)優(yōu)化設計研究[D];中南大學;2006年

相關碩士學位論文 前5條

1 王永剛;變高度U形梁熱沖壓數(shù)值模擬研究[D];吉林大學;2016年

2 馬繼剛;高氮奧氏體不銹鋼的組織與性能研究[D];長春工業(yè)大學;2016年

3 崔龍;基于ANSYS Workbench輪胎活絡模具結(jié)構(gòu)優(yōu)化及傳熱—應力模擬分析[D];青島科技大學;2015年

4 馮艷斌;Mg-Al-Sr-RE合金及其組織性能研究[D];重慶大學;2008年

5 馬瑩;往復擠壓Mg_2Si/Mg-Al基復合材料組織與性能的研究[D];西安理工大學;2006年

，

本文編號：2014461