本文選題：無(wú)芯模旋壓 + 變參數(shù)成形��； 參考：《浙江大學(xué)》2017年博士論文

【摘要】：旋壓成形技術(shù)因設(shè)備簡(jiǎn)單、變形力小、改善材料性能及無(wú)屑成形等優(yōu)勢(shì),已廣泛應(yīng)用于機(jī)械加工領(lǐng)域。但特定芯模的使用限制旋壓成形的柔性,阻礙旋壓技術(shù)的進(jìn)一步發(fā)展。無(wú)芯模旋壓采用通用芯模增強(qiáng)旋壓成形的柔性,是一種頗具潛力的新型金屬成形技術(shù),具有廣闊的研究及應(yīng)用前景。鑒于旋壓成形工藝參數(shù)對(duì)不同質(zhì)量參數(shù)的影響通常呈現(xiàn)矛盾趨勢(shì),采用恒定成形工藝參數(shù)難以實(shí)現(xiàn)無(wú)芯模旋壓參數(shù)化、智能化和精密化的發(fā)展要求。為解決上述問(wèn)題,本文建立了基于環(huán)向應(yīng)變量的旋壓成形量參數(shù)化表征模型及旋輪軌跡曲線參數(shù)化模型,為構(gòu)建工藝參數(shù)-成形質(zhì)量影響模型確立奠定基礎(chǔ);構(gòu)建坯料成形過(guò)程顯式分析與坯料回彈過(guò)程隱式分析相結(jié)合的有限元分析模型,獲取無(wú)芯模旋壓坯料自由變形機(jī)理;基于自主研發(fā)的復(fù)合式板料旋壓機(jī)建設(shè)無(wú)芯模旋壓成形試驗(yàn)平臺(tái)及成形件質(zhì)量參數(shù)測(cè)量方法。對(duì)變參數(shù)旋壓方法的機(jī)理進(jìn)行分析,形成關(guān)鍵旋壓工藝參數(shù)的調(diào)整思路。提出了基于道次間環(huán)向應(yīng)變量?jī)?yōu)化分配的無(wú)芯模旋壓變軌跡形狀設(shè)計(jì)方法�；诘来伍g環(huán)向應(yīng)變量?jī)?yōu)化分配,獲取道次間距優(yōu)化設(shè)計(jì)方案,為后續(xù)研究奠定工藝方案基礎(chǔ)。比較了四種軌跡形狀設(shè)計(jì)和三種道次間距設(shè)計(jì)方法,進(jìn)而提出軌跡形狀設(shè)計(jì)中利于形狀誤差抑制的“幾何相似性原則”及利于壁厚保持的“小曲率原則”;道次間距設(shè)計(jì)中利于形狀誤差抑制的“環(huán)向應(yīng)變量趨大原則”及利于壁厚保持的“環(huán)向應(yīng)變量均勻分配原則”。在此基礎(chǔ)上根據(jù)終道次優(yōu)先的改進(jìn)思路提出變軌跡綜合優(yōu)化設(shè)計(jì)方案。提出了基于道次間/內(nèi)環(huán)向應(yīng)變量逐層分解的無(wú)芯模旋壓變進(jìn)給比旋壓方法.將總環(huán)向應(yīng)變量進(jìn)行道次間分解,根據(jù)各道次環(huán)向應(yīng)變量進(jìn)行道次間成形時(shí)間優(yōu)化分配,提出有利于提高形狀精度的“環(huán)向應(yīng)變勻速分解原則”及“終道次充分成形原則”,通過(guò)與道次間環(huán)向應(yīng)變量相聯(lián)系的道次間變進(jìn)給方法實(shí)現(xiàn)坯料整體勻速變形。將終道次內(nèi)環(huán)向應(yīng)變量進(jìn)行分解,根據(jù)局部環(huán)向應(yīng)變進(jìn)行道次內(nèi)成形時(shí)間優(yōu)化分配,并提出有利于抑制形狀誤差的“環(huán)向應(yīng)變趨大充分成形原則”。提出了基于環(huán)向應(yīng)變量-形狀誤差分治的無(wú)芯模旋壓變軌跡形狀修正方法。通過(guò)動(dòng)態(tài)-靜態(tài)分步求解方法獲取回彈及過(guò)成形誤差的形成機(jī)理與分布特征,從而建立二者與環(huán)向應(yīng)變量的影響模型。提出利于回彈誤差控制的“環(huán)向應(yīng)變均勻分布原則”及利于過(guò)成形誤差控制的“環(huán)向應(yīng)變均勻變化原則”。通過(guò)無(wú)芯模旋壓變軌跡形狀修正方法實(shí)現(xiàn)回彈和過(guò)成形誤差的分離及基于形狀誤差數(shù)據(jù)的一次修正,并在此基礎(chǔ)上根據(jù)形狀誤差-環(huán)向應(yīng)變量關(guān)系模型實(shí)現(xiàn)“繼發(fā)性”形狀誤差的預(yù)補(bǔ)償。為驗(yàn)證本文所提出變參數(shù)成形方法的有效性,將變軌跡設(shè)計(jì)、變進(jìn)給比方法和變軌跡形狀修正三項(xiàng)變參數(shù)關(guān)鍵技術(shù)分別應(yīng)用于三個(gè)罩殼類回轉(zhuǎn)件產(chǎn)品的旋壓過(guò)程中,分別改善了成形件開(kāi)裂失效、起皺失效及形狀精度,從而驗(yàn)證了無(wú)芯模旋壓變參數(shù)成形方法的實(shí)際效果。
[Abstract]:Because of the advantages of simple equipment, small deformation force, improving material performance and non chip forming, spinning technology has been widely used in the field of mechanical processing. However, the use of specific core mould limits the flexibility of spinning forming, which hinders the further development of spinning technology. The new metal forming technology has a broad prospect of research and application. In view of the contradictory tendency of the technological parameters of the spinning process to different quality parameters, it is difficult to realize the development requirements of the non core mould spinning parameterization, intellectualization and precision with the constant forming process parameters. The parameterized characterization model and the parameterized model of the rotary wheel trajectory curve are established to establish the foundation for the establishment of the process parameter forming quality influence model, and the finite element analysis model combining the explicit analysis of blank forming process with the implicit analysis of the billet springback process is constructed to obtain the free deformation of the non core mould spinning blank. Mechanism, based on the independent research and development of the compound plate spinning machine, the test platform of the core free mould spinning forming and the measurement method of the quality parameters of the forming parts are constructed. The mechanism of the variable parameter spinning method is analyzed, and the adjustment idea of the key spinning process parameters is formed. Shape design method. Based on the optimal allocation of the intersecondary ring direction variables, the optimal design scheme of the channel spacing is obtained, which lays the foundation for the process plan for the follow-up research. Four kinds of trajectory shape design and three ways of the design of the channel spacing are compared, and the "geometric similarity principle" which is beneficial to the shape error suppression in the trajectory shape design is put forward and the advantage of the "geometric similarity" is put forward. "The principle of small curvature" for the wall thickness, the "principle of the ring direction variable" which is beneficial to the shape error suppression and the principle of "uniform distribution of the circumferential stress" for the wall thickness. On this basis, a comprehensive optimization design scheme for the variable trajectory is proposed based on the improvement thought of the final channel priority. The inter / inner ring is decomposed to the corresponding variable by layer by layer. The total ring is decomposed to the corresponding variable, and the distribution of the forming time is optimized according to the corresponding variables. The principle of "circumferential strain uniform resolution principle" and the "final full forming principle" are put forward to improve the shape precision. The integral uniform deformation of the billet is realized by the method of intercourse variable feed link with the cross link to the channel. The final inner ring is decomposed to the corresponding variable. According to the local circumferential strain, the distribution of the forming time in the channel is optimized, and the principle of "the full forming of the circumferential strain" is put forward to restrain the shape error. Based on the circumferential strain and shape error dividing method, the formation mechanism and distribution characteristics of the springback and over forming error are obtained by the dynamic and static method, and the influence model of the two and the circumferential variables is established, and the "uniform distribution original of the loop strain" is proposed for the control of the return elastic error. The principle of "uniform change of circumferential strain", which is favorable for over forming error control, is used to realize the separation of springback and over forming errors and a correction based on shape error data through the shape correction method of the non core model spinning variable trajectory shape, and on this basis, the "secondary" shape is realized on the basis of the shape error loop strain relation model. To verify the error precompensation, in order to verify the validity of the variable parameter forming method proposed in this paper, the key techniques of variable trajectory design, variable feed ratio and variable trajectory shape correction three variable parameters are applied to the spinning process of three shell and shell revolving parts respectively, and the cracking failure, wrinkling failure and shape accuracy of the formed parts are improved, respectively. The actual effect of the variable parameter forming method of spinning without core mold is verified.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【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 潘國(guó)軍;李勇;王進(jìn);陸國(guó)棟;;普通旋壓工藝及旋輪軌跡研究現(xiàn)狀與發(fā)展[J];浙江大學(xué)學(xué)報(bào)(工學(xué)版);2015年04期

2 Yong LI;Jin WANG;Guo-dong LU;Guo-jun PAN;;無(wú)芯模旋壓旋輪軌跡曲線對(duì)其成形精度影響的仿真研究（英文）[J];Journal of Zhejiang University-Science A(Applied Physics & Engineering);2014年06期

3 繆偉亮;劉大海;邵雪明;;工藝參數(shù)對(duì)薄壁件多道次旋壓變形均勻性的影響[J];精密成形工程;2014年02期

4 曾超;張賽軍;夏琴香;謝紅希;;旋輪軌跡和工藝參數(shù)對(duì)多道次拉深旋壓成形質(zhì)量的影響研究[J];鍛壓技術(shù);2014年01期

5 農(nóng)應(yīng)斌;;機(jī)械設(shè)計(jì)制造及其自動(dòng)化發(fā)展方向的研究[J];科技傳播;2013年02期

6 毛華杰;陳榮創(chuàng);劉君;;基于單元法向插值的模面回彈補(bǔ)償方法研究[J];精密成形工程;2011年06期

7 張晉輝;楊合;詹梅;陳飛;;旋輪參數(shù)對(duì)大型變壁厚橢圓封頭強(qiáng)力旋壓成形的影響[J];塑性工程學(xué)報(bào);2011年02期

8 林波;谷建民;周尚榮;劉建軍;蔡偉;方雷;;超半球殼體多道次拉深旋壓工藝研究[J];機(jī)械工程學(xué)報(bào);2011年06期

9 吳統(tǒng)超;詹梅;蔣華兵;古創(chuàng)國(guó);楊合;;旋壓間隙對(duì)大型復(fù)雜薄壁殼體多道次旋壓中第二道次成形質(zhì)量的影響[J];西北工業(yè)大學(xué)學(xué)報(bào);2011年01期

10 劉獻(xiàn)禮;陳濤;;機(jī)械制造中的低碳制造理論與技術(shù)[J];哈爾濱理工大學(xué)學(xué)報(bào);2011年01期

相關(guān)博士學(xué)位論文 前1條

1 付秀娟;變速/變載條件下板料沖壓成形性能及其變形機(jī)理研究[D];華中科技大學(xué);2012年

相關(guān)碩士學(xué)位論文 前3條

1 李飛;基于彎曲量的曲母線件多道次軌跡規(guī)劃及變進(jìn)給旋壓方法研究[D];浙江大學(xué);2016年

2 林孝俊;曲母線件多道次普旋關(guān)鍵參數(shù)對(duì)成形質(zhì)量影響分析及其優(yōu)化[D];浙江大學(xué);2014年

3 李勇;無(wú)芯模旋壓回彈變形特性及多道次軌跡規(guī)劃方法仿真研究[D];浙江大學(xué);2014年

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