本文選題：輥彎成形　切入點(diǎn)：超高強(qiáng)度鋼　出處：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：輥彎成形技術(shù)能夠生產(chǎn)高強(qiáng)度、性能佳、高精度的型鋼產(chǎn)品,并且具有高效、節(jié)能、省材等特點(diǎn),在汽車、建筑等領(lǐng)域得到廣泛運(yùn)用。本文采用解析法、有限元模擬以及實(shí)驗(yàn)等方法對(duì)超高強(qiáng)度鋼輥彎成形變形機(jī)理展開研究。本文建立了超高強(qiáng)度鋼輥彎成形ABAQUS有限元仿真模型,通過對(duì)比實(shí)驗(yàn)工件和模擬工件的最終截面尺寸,驗(yàn)證了有限元模型的準(zhǔn)確性;考慮了縱向彎曲應(yīng)變對(duì)最終縱向應(yīng)變值的影響,解析分析了超高強(qiáng)度鋼輥彎成形板材縱向應(yīng)變,修正了計(jì)算縱向應(yīng)變理論公式,并通過數(shù)值模擬和實(shí)驗(yàn)驗(yàn)證了解析結(jié)果,仿真和實(shí)驗(yàn)結(jié)果表明,解析計(jì)算得出的縱向應(yīng)變值和實(shí)驗(yàn)所得縱向應(yīng)變值誤差為5E-4。本文闡述了輥彎成形變形機(jī)理,輥彎成形過程是板材重復(fù)進(jìn)行加載-卸載的受力過程,板材在經(jīng)過各道次軋輥后,各單元結(jié)點(diǎn)的等效應(yīng)力發(fā)生階段性釋放。所以輥彎成形工件的回彈是由于多道次彈性應(yīng)力逐次釋放引起的,,而工件最終成形是多道次總塑性應(yīng)變累積的結(jié)果。針對(duì)超高強(qiáng)度鋼輥彎成形件的回彈缺陷,提出了控制回彈的成形工藝方法。本文分析兩種軋輥設(shè)計(jì)方案,板材下彎角處的應(yīng)力、應(yīng)變場(chǎng),結(jié)果表明,實(shí)彎能夠有效增大彎角區(qū)的塑性變形,增大等效塑性應(yīng)變值,提高輥彎成形件精度,成形件彎角區(qū)的板材的變厚情況得到明顯改善,使板材下彎角區(qū)材料流動(dòng)更加合理。對(duì)比軋輥改良前后,成形板材的成形精度得出改善,優(yōu)化后成形件的回彈角度最大誤差為1.66%。
[Abstract]:Roll forming technology can produce high strength, good performance, high precision steel products, and has the characteristics of high efficiency, energy saving, saving materials and so on, and has been widely used in automobile, building and other fields. The deformation mechanism of ultra-high strength steel roll bending forming is studied by finite element simulation and experiment. In this paper, the ABAQUS finite element simulation model of ultra high strength steel roll bending forming is established, and the final cross section dimensions of experimental workpiece and simulated workpiece are compared. The accuracy of the finite element model is verified, the effect of longitudinal bending strain on the final longitudinal strain is considered, the longitudinal strain of sheet metal formed by ultra-high strength steel roll bending is analytically analyzed, and the theoretical formula for calculating longitudinal strain is revised. The analytical results are verified by numerical simulation and experiments. The results of simulation and experiment show that the errors between the calculated longitudinal strain values and the experimental longitudinal strain values are 5E-4. The deformation mechanism of roll bending forming is described in this paper. The forming process of roll bending is the process of repeated loading and unloading of sheet metal. After the plate passes through each pass of roll, The equivalent stress of each unit node is released in stages. Therefore, the springback of the roll formed workpiece is caused by the successive release of the elastic stress, and the final forming of the workpiece is the result of the accumulation of the total plastic strain of multiple passes. Springback defects of roll bending forming parts of ultra-high strength steel, This paper analyses two kinds of roll design schemes, the stress and strain fields at the lower corner of sheet metal. The results show that the actual bending can effectively increase the plastic deformation in the corner zone and increase the equivalent plastic strain value. By improving the precision of roll bending forming parts, the thickening of sheet metal in the corner zone of forming parts is obviously improved, which makes the material flow more reasonable in the lower corner zone of sheet metal. Compared with the improvement of roll, the forming accuracy of forming sheet metal is improved. The maximum error of springback angle is 1.66.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG306

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 武萬(wàn)斌;年雪山;;汽車輕量化技術(shù)發(fā)展趨勢(shì)[J];汽車工程師;2017年01期

2 張艷君;;汽車輕量化材料技術(shù)發(fā)展現(xiàn)狀[J];汽車零部件;2016年04期

3 蘇春建;王薛滔;王清;;波形板輥彎工藝分析與設(shè)計(jì)[J];鍛壓技術(shù);2015年12期

4 郭玉琴;朱新峰;楊艷;熊倪;;汽車輕量化材料及制造工藝研究現(xiàn)狀[J];鍛壓技術(shù);2015年03期

5 閻昱;王海波;趙n，

本文編號(hào)：1699353