本文關(guān)鍵詞： 薄壁槽鋼零件 輥彎成形 邊波 波動量 有限元數(shù)值模擬　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,冷彎型鋼產(chǎn)品類型逐漸向薄壁、輕量化、高強度、復(fù)雜斷面等方向發(fā)展,而薄壁冷彎型鋼零件輥彎成形時更容易產(chǎn)生邊波等缺陷,嚴重影響產(chǎn)品外觀和使用性能。盡管輥彎成形技術(shù)在國內(nèi)外得到了極大的發(fā)展,但是其成形理論仍然不夠系統(tǒng),實際生產(chǎn)中亦只能依靠經(jīng)驗進行軋輥設(shè)計和工藝調(diào)整。因此,研究薄壁冷彎型鋼零件輥彎成形過程及其成形缺陷具有重要的意義。本文利用ABAQUS有限元軟件對薄壁槽鋼零件輥彎成形過程進行有限元模擬,揭示了薄壁槽鋼零件在輥彎成形過程中的金屬變形規(guī)律和特點,分析了薄壁槽鋼零件輥彎成形過程中邊波(邊緣波浪)的成形的機理,設(shè)計了一個邊緣波動量的評估標(biāo)準(zhǔn)Δy,并以波動量Δy為評估參數(shù),設(shè)計了邊波影響因素的正交模擬實驗,分析了零件材料的屈服強度σs、輥彎成形道次n、零件翼緣高度h、材料厚度t等因素對輥彎成形邊波波動量Δy的影響,主要結(jié)論如下:1)薄壁槽鋼零件輥彎成形過程中,較大的應(yīng)力應(yīng)變主要集中在彎角部位,應(yīng)力應(yīng)變大小隨著彎曲角度的增加(即道次序數(shù)的增加)而增加,而應(yīng)變分布比應(yīng)力分布較均勻。在逐步折彎過程中,材料在寬度方向上被拉長,相應(yīng)地在長度方向上縮短、厚度方向變薄,且橫向(寬度方向)應(yīng)變值遠大于縱向及厚向應(yīng)變值。2)邊波產(chǎn)生的機理是由于零件翼緣部位各點產(chǎn)生了縱向應(yīng)力和不可恢復(fù)的縱向塑性應(yīng)變、且其大小沿翼緣長度方向(縱向)及高度方向分布不均勻引起的:分布不均的縱向應(yīng)力在翼緣邊部產(chǎn)生彎矩,在縱向拉應(yīng)力處產(chǎn)生縱向塑性伸長,翼緣邊部向外側(cè)傾斜;在縱向壓應(yīng)力處產(chǎn)生縱向塑性壓縮,邊部向內(nèi)側(cè)傾斜。3)板料的屈服強度σs、成形道次n、翼緣高度h以及板料厚度t等因素均會影響邊波的產(chǎn)生和波動量的大小,對邊波波動量Δy的影響程度為htσsn。4)邊波波動量Δy隨著材料屈服強度σs和板料厚度t的增大而減小;隨著翼緣高度h的增加而顯著增大;隨成形道次n的增加,Δy先減小后增大。5)在設(shè)計薄壁槽鋼零件時,為避免成形時產(chǎn)生邊波,應(yīng)盡可能減小翼緣高度并選用屈服強度較高的材料;在設(shè)計薄壁槽鋼零件輥彎成形工藝時,應(yīng)選擇合理的成形道次并采取潤滑、增加整形工序等工藝措施來控制邊波的波動量。
[Abstract]:In recent years, the product types of cold-formed steel have gradually developed towards thin-walled, lightweight, high-strength and complex cross-sections, while the defects such as side waves are more easily produced in the roll forming of thin-walled cold-formed steel parts. Although roll bending technology has been developed greatly at home and abroad, its forming theory is still not systematic enough, and it can only rely on experience to design and adjust the roll in practice. It is of great significance to study the roll forming process and its forming defects of thin-walled cold-formed steel parts. In this paper, ABAQUS finite element software is used to simulate the roll bending process of thin-walled channel steel parts. The metal deformation law and characteristics of thin-walled channel steel parts in roll bending process are revealed. The forming mechanism of edge wave (edge wave) in roll bending forming of thin-walled channel steel parts is analyzed. An evaluation criterion of edge fluctuation 螖 y is designed, and the orthogonal simulation experiment of the influence factors of edge wave is designed with the fluctuation 螖 y as the evaluation parameter. The effects of yield strength 蟽 s, roll bending pass number n, flange height h and material thickness t on the wave momentum 螖 y at the edge of roll bending forming are analyzed. The main conclusions are as follows: 1) in the process of roll bending forming of thin-walled channel steel parts, The larger stress and strain are mainly concentrated in the corner, the magnitude of stress and strain increase with the increase of bending angle (that is, the number of trace sequence), and the distribution of strain is more uniform than that of stress. The material is elongated in the width direction, shortened in the length direction, thinned in the thickness direction, The mechanism of the lateral (width direction) strain value is much larger than the longitudinal and thick strain value. 2) the mechanism is that the longitudinal stress and the unrecoverable longitudinal plastic strain are produced at each point of the flange of the part. And its size along the flange length direction (longitudinal) and height direction distribution is not uniform: uneven distribution of longitudinal stress in the flange edge of bending moment, in the longitudinal tensile stress caused by longitudinal plastic elongation, flange edge edge to the lateral tilt; Longitudinal plastic compression occurs at the longitudinal compression stress, and the yield strength 蟽 s of the sheet is inclined to the inner side, the forming pass is nn, the height of the flange h and the thickness of the sheet metal t all affect the generation of the side wave and the magnitude of the fluctuation. The influence degree of wave momentum 螖 y on the edge wave is ht 蟽 n. 4) the wave momentum 螖 y decreases with the increase of material yield strength 蟽 s and sheet thickness t, and increases significantly with the increase of flange height h. When designing thin-walled channel steel parts, the flange height should be reduced as much as possible and the material with higher yield strength should be selected in order to avoid the edge wave in the design of thin-walled channel steel parts. When designing the roll bending forming process of thin-walled channel steel parts, it is necessary to select reasonable forming passes and take some technological measures such as lubrication and increasing shaping procedure to control the fluctuation of side wave.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG306

【相似文獻】

相關(guān)期刊論文 前10條

1 尹紀(jì)龍;李大永;彭穎紅;王飛舟;;動力顯式有限元法輥彎成形全流程仿真技術(shù)研究[J];塑性工程學(xué)報;2006年01期

2 郭烈恩;趙亞莉;涂文斌;;輥彎成形仿真分析與參數(shù)優(yōu)化(英文)[J];Transactions of Nanjing University of Aeronautics & Astronautics;2009年01期

3 田偉;臧勇;王曉玉;;風(fēng)管共板法蘭輥彎成形過程的有限元仿真[J];冶金設(shè)備;2009年03期

4 李大永;蔣勁茂;彭穎紅;尹紀(jì)龍;;輥彎成形過程仿真與參數(shù)優(yōu)化[J];系統(tǒng)仿真學(xué)報;2007年04期

5 羅曉亮;曾國;李淑慧;于忠奇;;材料參數(shù)對高強鋼輥彎成形邊波影響的有限元分析[J];上海交通大學(xué)學(xué)報;2008年05期

6 劉續(xù);陽振峰;;一種三維輥彎成形裝備的電機控制方案分析[J];黑龍江科技信息;2013年30期

7 張寶;丁武學(xué);彭斌彬;;下山法成形在輥彎成形中的應(yīng)用[J];鍛壓技術(shù);2014年01期

8 徐樹成,劉才;方矩形管第一道次輥彎成形過程的變形和應(yīng)力場[J];燕山大學(xué)學(xué)報;2000年01期

9 曾國;來新民;于忠奇;林忠欽;;多道次輥彎成形動力顯式仿真的虛擬速度[J];上海交通大學(xué)學(xué)報;2008年09期

10 岳遠旺;溫彤;劉磊;吳穎;;多輥輥彎成形工藝設(shè)計方法的對比研究[J];熱加工工藝;2013年05期

相關(guān)會議論文 前2條

1 晏培杰;韓靜濤;馬越峰;;高強鋼熱輥彎成形技術(shù)及其發(fā)展[A];第十四屆中國科協(xié)年會第8分會場：鋼材深加工研討會論文集[C];2012年

2 劉霞;景作軍;;不銹鋼圓管輥彎成形的有限元分析及回彈控制[A];中國計量協(xié)會冶金分會2014年會暨能源計量與綠色冶金論壇論文集[C];2014年

相關(guān)博士學(xué)位論文 前1條

1 曾國;多道次輥彎成形冷彎型鋼殘余應(yīng)力有限元仿真與實驗研究[D];上海交通大學(xué);2009年

相關(guān)碩士學(xué)位論文 前10條

1 石碧瑩;定模動輥變截面輥彎成形生產(chǎn)線控制系統(tǒng)研究[D];北方工業(yè)大學(xué);2015年

2 黎宇;薄壁槽鋼零件輥彎成形數(shù)值模擬及其邊波缺陷研究[D];湘潭大學(xué);2015年

3 裴少偉;高強鋼S型輥彎成形工藝研究[D];北方工業(yè)大學(xué);2013年

4 王婷;變截面輥彎成形質(zhì)量評估及影響因素研究[D];北方工業(yè)大學(xué);2013年

5 陽振峰;高強鋼三維輥彎成形生產(chǎn)線樣機機械系統(tǒng)動力學(xué)分析[D];北方工業(yè)大學(xué);2013年

6 王世鵬;變截面輥彎成形缺陷機理研究[D];北方工業(yè)大學(xué);2013年

7 劉進;汽車B柱輥彎成形仿真及試驗研究[D];北方工業(yè)大學(xué);2011年

8 王貫軍;變截面輥彎成形運動控制成套硬件體系架構(gòu)研究[D];北方工業(yè)大學(xué);2013年

9 仇素萍;方管雙輥交互式輥彎成形新技術(shù)的數(shù)值仿真研究[D];上海交通大學(xué);2007年

10 劉志青;轎車防撞梁輥彎成形關(guān)鍵技術(shù)研究[D];吉林大學(xué);2009年

，

本文編號：1508344