本文關(guān)鍵詞：鋁鋰合金非對(duì)稱(chēng)截面型材四軸滾彎工藝研究　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 鋁鋰合金 非對(duì)稱(chēng) 2形型材 L形型材 四軸滾彎 斜彎曲 變曲率

【摘要】：非對(duì)稱(chēng)截面新型鋁鋰合金型材被廣泛應(yīng)用于我國(guó)自主研制的大型客機(jī)C919中后機(jī)身的重要桁架零件制造,這類(lèi)零件需采用四軸滾彎的成形方法。由于這類(lèi)鋁鋰合金型材的材料比強(qiáng)度高、截面非對(duì)稱(chēng)、輪廓變曲率,采用傳統(tǒng)滾彎方法不僅難于加工出高質(zhì)量的型材,而且加工效率低、廢品率高。為了滿足飛機(jī)的研制,急需進(jìn)行相關(guān)工藝研究。為此,本文以2099-T83鋁鋰合金2形及2099-T3鋁鋰合金L形型材的四軸滾彎成形為例,開(kāi)展了相關(guān)關(guān)鍵工藝技術(shù)的研究。通過(guò)2099-T3及2099-T83鋁鋰合金材料的成形性能試驗(yàn)研究,得到了兩種材料的主要成形性能參數(shù)及本構(gòu)方程,進(jìn)行了2099-T3及2099-T83鋁鋰合金板料的彎曲試驗(yàn)及模擬,分析了板料厚度、材料類(lèi)型、下壓量對(duì)板料回彈后彎曲角的影響,為后續(xù)的工藝模擬分析提供依據(jù)。從力學(xué)角度分析了2形及L形型材的滾彎過(guò)程,分析了滾彎成形中可能產(chǎn)生的工藝問(wèn)題。以MC4P431IAS新型數(shù)控滾彎?rùn)C(jī)為對(duì)象,進(jìn)行了兩種型材的等曲率滾彎模擬。首先,分析了摩擦系數(shù)對(duì)2形及L形型材滾彎回彈的影響,得到在不影響型材送料的情況下,型材與滾輪之間摩擦越小越好。然后,討論了2形型材與滾輪之間間隙、下滾輪與2形型材下表面之間豎直方向預(yù)留間隙、左右滾輪X方向移動(dòng)量對(duì)2形型材滾彎斜彎曲的影響;研究了不同上下滾輪夾緊型材量對(duì)L形型材滾彎斜彎曲的影響。由此得到了兩種型材的滾彎斜彎曲控制方法,確定了兩種型材的最佳滾彎工藝參數(shù)。最后,基于最佳滾彎工藝參數(shù),完成了兩種型材在不同左右滾輪抬升量下的等曲率滾彎模擬,得到了兩種型材的滾彎成形規(guī)律及回彈規(guī)律。根據(jù)兩種型材的最佳滾彎工藝參數(shù)及滾彎成形規(guī)律,設(shè)計(jì)并制造了2形及L形型材滾彎成形的滾輪模具,采用分段等曲率滾彎方法進(jìn)行了兩種型材的變曲率滾彎模擬及工藝驗(yàn)證試驗(yàn),試驗(yàn)與模擬結(jié)果一致性較好。對(duì)滾彎試驗(yàn)后兩種變曲率型材的縱向輪廓度、斜彎曲程度及截面尺寸偏差進(jìn)行了分析,結(jié)果表明試驗(yàn)后的兩種變曲率型材均滿足設(shè)計(jì)要求。本文研究獲得如下成果:(1)提出了2形及L形型材的滾彎斜彎曲控制方法。(2)得出了兩種型材的滾彎成形規(guī)律。(3)提出了分段等曲率滾彎方法來(lái)解決變曲率型材零件的加工方案。完成了2形及L形變曲率型材的試制,攻克了C919客機(jī)型材滾彎成形工藝難題。研究取得的成果已成功應(yīng)用于C919客機(jī)型材滾彎成形的生產(chǎn),提升了我國(guó)型材滾彎加工水平。
[Abstract]:The important parts of non symmetrical section truss model of aluminum lithium alloy material has been widely used in China's self-developed large passenger aircraft C919 in the rear fuselage manufacturing, this kind of parts required by the four axis roll bending forming method. Because this kind of lithium aluminium alloy profiles material with high specific strength, non symmetrical section, contour curvature, the the traditional method is not only difficult to roll out processing profiles of high quality, and low processing efficiency, high rejection rate. In order to meet the urgent need for the development of aircraft, research related technology. Therefore, this paper takes 2099-T83 aluminium lithium alloy 2 and 2099-T3 aluminum lithium alloy L section four axis roll bending as an example, to carry out research the related key technology. Through the experimental investigation on formability of materials 2099-T3 and 2099-T83 aluminum lithium alloy, the main forming performance parameters of two kinds of materials and the constitutive equation of lithium aluminium alloy plate 2099-T3 and 2099-T83 materials The bending test and the simulation, the thickness of the plate material type, material analysis, under the pressure of springback of bending angle, provide the basis for the subsequent analysis of the process simulation. From the point of view of mechanics analysis of the roll bending process 2 and L profiles, analysis of the roll bending process problems that may arise in forming MC4P431IAS. With the new CNC bending machine as the object, the two section curvature bending simulation. Firstly, analyzed the influence of friction coefficient on the 2 and L section bending springback, obtained without affecting the profile feeding condition, the friction between the roller and the smaller the better profile. Then, the gap between the 2 section and the roller, the lower roller and the 2 profile under the surface between the vertical roller clearance, about X moving in 2 profile bending effect of oblique bending; Study on different roller clamping profiles amount on L profile bending oblique bending The effects are obtained. Oblique bending roll bending control method of two kinds of profiles, the optimum roll bending process parameters of two kinds of profiles are determined. Finally, the optimum roll bending process parameters based on the completion of two kinds of profiles in the different uplift under the left wheel curvature bending simulation, the roll bending two profiles of the law and law of springback. According to the two section of the optimum roll bending process parameters and roll bending rules, the design and manufacture of mold shaped and L shaped roller 2 roll bending forming, using piecewise curvature bending methods are two kinds of variable curvature roll simulation and process verification test the results of simulation and test agree well. The rolling bending test after two kinds of variable curvature profiles of the longitudinal profile deviation, oblique bending degree and section size were analyzed, the results show that two kinds of variable curvature profile after the test and meet the design requirements of this research. The results were as follows: (1) put forward the control method of 2 roll skew bending shape and L section. (2) the roll forming law of two sections. (3) proposed roll bending method for piecewise curvature to solve variable curvature profile machining scheme. Completed the trial and 2 L deformation curvature profile, to capture the C919 aircraft profile roll bending process problem. The research results have been successfully applied to the production of roll bending forming of C919 aircraft, raised China's profile bending processing level.

【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：V261

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