本文選題：鈦合金管材　切入點(diǎn)：金屬?gòu)?qiáng)化　出處：《燕山大學(xué)》2015年碩士論文

【摘要】：隨著鈦合金管材在航空、航天和船舶領(lǐng)域的廣泛應(yīng)用,對(duì)其需求量和質(zhì)量要求越來越高,矯直是鈦合金管材生產(chǎn)中的關(guān)鍵工序,矯直質(zhì)量直接影響產(chǎn)品質(zhì)量,所以對(duì)其探索新的矯直技術(shù)成為亟待解決的問題。對(duì)于鈦合金管材矯直,若采用雙曲線多斜輥矯直機(jī)進(jìn)行矯直,會(huì)使管材頭尾得不到矯直;若采用二輥矯直機(jī),因?yàn)殁伜辖饛椥阅Ａ啃?反彎半徑小,使用單向反彎二輥輥型必然使輥端輥腰半徑差加大,使咬入傾角過大產(chǎn)生應(yīng)力集中降低矯直質(zhì)量,使用雙向反彎輥型因其屈服極限高矯直力就會(huì)加大,不利于矯直。本文研究了復(fù)合輥型矯直機(jī)對(duì)鈦合金管材的矯直過程,管材先經(jīng)前置六個(gè)雙曲線輥矯直,再經(jīng)后置二輥進(jìn)行頭尾補(bǔ)充矯直使其全長(zhǎng)得到矯直,并且從整體設(shè)計(jì)角度對(duì)二輥輥型進(jìn)行了設(shè)計(jì)。本文根據(jù)塑性變形深度的不同,給出了考慮金屬?gòu)?qiáng)化時(shí)管材彎矩計(jì)算模型,與以往對(duì)其推導(dǎo)方式不同。在此基礎(chǔ)之上,研究管材反彎彈復(fù)過程,為減小矯直輥端與輥腰直徑差,對(duì)二輥輥型進(jìn)行較短輥身長(zhǎng)度設(shè)計(jì),使輥型平緩,通過編程計(jì)算不同反彎曲率比下的殘余曲率比,來確定最佳反彎曲率比組合以彌補(bǔ)較短輥長(zhǎng)設(shè)計(jì)對(duì)矯直精度的影響,使管材在此種輥型設(shè)計(jì)下達(dá)到最高的矯直精度。確定輥型結(jié)構(gòu)參數(shù)之后,求解了輥型曲線,并編輯了輥型設(shè)計(jì)可視化界面。通過有限元軟件對(duì)復(fù)合輥型矯直機(jī)的矯直過程進(jìn)行仿真,分析了整個(gè)矯直過程中的應(yīng)力、應(yīng)變和矯后管材殘余應(yīng)力。分析了不同壓彎量和壓扁量下管材的殘余應(yīng)力、直線度等參數(shù)并對(duì)矯直最佳壓扁量和壓彎量進(jìn)行選取。對(duì)于管材在后置二輥為單向反彎輥型和雙向反彎輥型下的矯直質(zhì)量進(jìn)行對(duì)比,選擇最佳輥型并且進(jìn)行輥型修正降低了管材殘余應(yīng)力,提高了直線度和圓度。最后,復(fù)合輥型矯直機(jī)與六輥雙曲線輥型矯直機(jī)矯直質(zhì)量進(jìn)行對(duì)比,可看出其解決了管材頭尾矯直的問題且使管材全長(zhǎng)矯直精度有所提高。
[Abstract]:With the wide application of titanium alloy pipe in the fields of aviation, aerospace and ship, the demand and quality requirements for titanium alloy pipe are more and more high. Straightening is the key process in the production of titanium alloy pipe, and straightening quality directly affects the product quality.Therefore, to explore new straightening technology has become an urgent problem.For titanium alloy pipe straightening, if a hyperbolic multi-oblique roll straightening machine is used to straighten the pipe, the head and tail of the pipe will not be straightened; if a two-roll straightener is used, because the titanium alloy has a small elastic modulus and a small reverse bending radius,The use of unidirectional reverse bending two-roll profile will inevitably increase the difference of roll waist radius at the end of the roll and cause stress concentration to decrease the straightening quality due to excessive bite angle. The use of two-way reverse bending roller will increase due to its high yield limit straightening force, which is not conducive to straightening.In this paper, the straightening process of titanium alloy pipe by compound roller straightening machine is studied. The tube is straightened by six front hyperbolic rollers, and then by two rollers after which the full length of the pipe is straightened by the head and tail supplementary straightening.And from the overall design point of view of the two-roll design.According to the different depth of plastic deformation, a calculation model of pipe bending moment considering metal strengthening is presented in this paper, which is different from the previous derivation.On this basis, the reverse bending process of pipe is studied. In order to reduce the diameter difference between straightening roll end and roll waist, the short roll body length is designed to make the roll shape smooth, and the residual curvature ratio under different ratio of reverse bending rate is calculated by programming.In order to make up for the influence of short roll length design on straightening accuracy, the best combination of reverse bending ratio is determined to make the tube achieve the highest straightening accuracy under the design of this kind of roll shape.After determining the structural parameters of the roll profile, the roll profile curve is solved and the visual interface of the roll profile design is edited.The simulation of the straightening process of the compound roller straightener was carried out by finite element software, and the stress, strain and residual stress of the tube after straightening were analyzed.The parameters of residual stress and straightness of pipe under different bending and flattening quantities are analyzed and the optimum flattening and bending amount are selected.The straightening quality of pipe is compared under the condition that the back two rollers are unidirectional reverse bending roll and bidirectional reverse bending roll. The optimum roll shape is selected and the residual stress of pipe is reduced and the straightness and roundness are improved.Finally, by comparing the straightening quality of compound roller straightening machine with that of six-high hyperbolic roller straightening machine, it can be seen that the problem of pipe head and tail straightening has been solved and the straightening accuracy of the whole length of pipe has been improved.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG333.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 朱美珍,黃雨華,王春香;對(duì)向六斜輥管材矯直機(jī)壓扁壓下量研究[J];包頭鋼鐵學(xué)院學(xué)報(bào);1998年01期

2 趙炳利,趙紅雁,劉志亮,李叔彥;斜輥矯直機(jī)矯直輥輥形對(duì)安裝角和接觸線長(zhǎng)度的影響[J];燕山大學(xué)學(xué)報(bào);1998年02期

3 李連進(jìn);;六輥斜軋無(wú)縫鋼管矯直機(jī)的壓下量研究[J];鍛壓技術(shù);2008年05期

4 劉鵠然，李強(qiáng);矯直輥輥形分析與管棒材矯直的密切關(guān)系[J];鋼管;1995年04期

5 李漢杰,康儉;利用AutoCAD設(shè)計(jì)二斜輥矯直輥型的新方法[J];河北冶金;2001年03期

6 項(xiàng)凌松;王會(huì)民;王淑貞;王正平;;六輥矯直機(jī)消除無(wú)縫鋼管矯后管端壓扁的工藝研究[J];黑龍江冶金;2000年02期

7 苑國(guó)強(qiáng),吳鳳芳;輥型曲面的計(jì)算方法[J];山東工業(yè)大學(xué)學(xué)報(bào);1999年05期

8 江志強(qiáng);楊合;詹梅;許旭東;李光俊;;鈦合金管材研制及其在航空領(lǐng)域應(yīng)用的現(xiàn)狀與前景[J];塑性工程學(xué)報(bào);2009年04期

9 崔甫;二輥式矯直機(jī)的理論分析與計(jì)算[J];冶金設(shè)備;1982年05期

10 胡高舉,鄭才剛,王勤,劉勛;斜輥矯直機(jī)輥型曲線的一種新算法[J];重型機(jī)械;2002年06期

相關(guān)碩士學(xué)位論文 前1條

1 朱洪志;鈦合金的三輥斜軋穿孔工藝分析[D];太原科技大學(xué);2013年

，

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