發(fā)布時(shí)間：2018-06-01 04:24

  本文選題：Al-W合金 + 本構(gòu)方程�。� 參考：《中北大學(xué)》2015年碩士論文

【摘要】：近年來(lái),汽車工業(yè)的發(fā)展非常迅速,已經(jīng)成為了我國(guó)的支柱產(chǎn)業(yè),為了達(dá)到汽車輕量化的目標(biāo),鋁合金作為一種新的輕合金被廣泛地應(yīng)用到了汽車制造中。隨著人們的生活水平的提高,對(duì)汽車的安全性和舒適度等又提出了新的要求。汽車空調(diào)是保證汽車舒適的重要零部件,而渦旋盤屬于汽車空調(diào)制冷壓縮機(jī)的核心零部件,對(duì)汽車空調(diào)的性能有著極其重要的影響,尤其是耐磨性,跟汽車的安全性能密切相關(guān),故針對(duì)渦旋盤的材料和成形工藝的研究得到越來(lái)越多的重視。傳統(tǒng)的渦旋盤成形采用的是普通鋁合金,本文采用了一種新型的Al-W粉末材料,并針對(duì)該材料提出了新的粉末成形方法,以克服傳統(tǒng)粉末冶金構(gòu)件局部密度超差、產(chǎn)品結(jié)構(gòu)形狀有一定限制的缺點(diǎn),并提高零件的耐磨性。 本文研究的原材料是機(jī)械合金化得到的Al-W粉末,隨著通過(guò)粉末壓制的方法得到Al-W合金熱壓坯,將其作為渦旋盤的零件毛坯,然后對(duì)熱壓坯料進(jìn)行了熱壓縮試驗(yàn),對(duì)Al-W合金的熱變形力學(xué)行為進(jìn)行了研究。通過(guò)回歸分析的方法,分析了熱變形過(guò)程中Al-W合金的流變應(yīng)力σ、應(yīng)變速率ε及變形溫度T之間的相關(guān)性,并建立了Al-W合金的應(yīng)變補(bǔ)償型Arrhenius本構(gòu)方程,為數(shù)值模擬工作提供必要的材料模型和參數(shù),得到的本構(gòu)模型如下： 以材料動(dòng)態(tài)模型為基礎(chǔ),繪制出Al-W合金的加工圖,并對(duì)其加以分析,最后確定了Al-W合金最佳的安全加工區(qū)域?yàn)椋簻囟?60℃-570℃,應(yīng)變速率為0.01s-1-0.001s-,此時(shí),其功率耗散因子達(dá)到最大值0.55,為Al-W合金的工藝制定提供了實(shí)驗(yàn)參數(shù)。 利用DEFORM-3D軟件對(duì)Al-W合金渦旋動(dòng)盤背壓成形進(jìn)行了數(shù)值模擬,分析了成形過(guò)程中材料的流動(dòng)規(guī)律,并對(duì)模具圓角半徑大小對(duì)成形力、等效應(yīng)力分布規(guī)律的影響進(jìn)行了分析,為渦旋動(dòng)盤的工藝制定和模具設(shè)計(jì)提供了合理的依據(jù),得到的結(jié)論為：隨著圓角半徑的增大,成形力有所減小。圓角半徑越大,渦旋體部位的等效應(yīng)力分布越均勻,變形越均勻,最終確定合適的圓角半徑應(yīng)為2.5。最后對(duì)渦旋動(dòng)盤零件進(jìn)行了實(shí)驗(yàn)試制，對(duì)有限元模擬結(jié)果的準(zhǔn)確性進(jìn)行驗(yàn)證。
[Abstract]:In recent years, the automobile industry has developed very rapidly and has become the pillar industry of our country. In order to achieve the goal of automobile lightweight, aluminum alloy has been widely used in automobile manufacturing as a new light alloy. With the improvement of people's living standard, new requirements are put forward for the safety and comfort of automobiles. Automobile air conditioning is an important part to ensure automobile comfort, and scroll disc is the core part of automobile air conditioning refrigeration compressor, which has an extremely important influence on the performance of automobile air conditioning, especially the wear resistance. It is closely related to the safety performance of automobile, so more and more attention has been paid to the material and forming process of vortex disc. Conventional aluminum alloy is used in the traditional vortex disk forming. A new Al-W powder material is used in this paper, and a new powder forming method is put forward to overcome the local overdensity difference of the traditional powder metallurgy component. The structure of the product has some limitations on the shape of the defects and improve the wear resistance of the parts. The raw material studied in this paper is the Al-W powder obtained by mechanical alloying. With the method of powder compaction, the hot pressed billet of Al-W alloy is obtained, which is used as part blank of vortex disk, and then the hot compression test of hot pressed blank is carried out. The thermal deformation mechanical behavior of Al-W alloy was studied. The correlation between flow stress 蟽, strain rate 蔚 and deformation temperature T of Al-W alloy during hot deformation was analyzed by regression analysis, and the strain compensated Arrhenius constitutive equation of Al-W alloy was established. The necessary material models and parameters are provided for the numerical simulation work. The constitutive models are obtained as follows: Based on the material dynamic model, the machining diagram of Al-W alloy was drawn and analyzed. Finally, the optimum safe processing area of Al-W alloy was determined as follows: temperature 560 鈩，

本文編號(hào)：1962827