本文關(guān)鍵詞： 再制造 傳動(dòng)軸 臨界平面法 有限元分析 修正系數(shù) 壽命預(yù)測(cè)　出處：《蘭州理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：由于能源日漸趨于緊張、氣候環(huán)境惡化的影響，低碳、環(huán)保、節(jié)能減排成為世界關(guān)注的話題。全球倡導(dǎo)低碳節(jié)能，我國承諾到2020年單位國內(nèi)生產(chǎn)總值二氧化碳排放比2005年下降40％至45％。隨著工業(yè)化、城鎮(zhèn)化步伐的加快，伴隨鐵礦石價(jià)格上漲、人口眾多、經(jīng)濟(jì)發(fā)展水平較低等實(shí)際現(xiàn)狀，我國要達(dá)到這一減排目標(biāo)面臨著巨大的壓力和挑戰(zhàn)。但也正是這樣的硬性約束指標(biāo)，推動(dòng)了我國再制造行業(yè)的加速發(fā)展，促進(jìn)我國循環(huán)經(jīng)濟(jì)健康有序的可持續(xù)發(fā)展。作為再生資源利用的一種高級(jí)形式，再制造為發(fā)展循環(huán)經(jīng)濟(jì)、推動(dòng)節(jié)能減排創(chuàng)造了條件，推動(dòng)了機(jī)械行業(yè)的可持續(xù)發(fā)展。 再制造產(chǎn)品能否滿足下一個(gè)生命周期的使用，直接決定了再制造本身的價(jià)值及意義。因此再制造零、部件的壽命預(yù)測(cè)成為整個(gè)再制造工程中的一項(xiàng)技術(shù)難題。針對(duì)這一難題，本文圍繞再制造鏟運(yùn)機(jī)傳動(dòng)軸壽命評(píng)估展開研究： 本文利用PRO/E軟件下建立傳動(dòng)軸三維模型，在ANSYS軟件Workbench環(huán)境下對(duì)該軸進(jìn)行彈塑性有限元分析，獲得危險(xiǎn)部位的應(yīng)力應(yīng)變數(shù)據(jù)，再以坐標(biāo)變換原理建立并確定鏟運(yùn)機(jī)傳動(dòng)軸的臨界平面及臨界平面上關(guān)鍵損傷參量。根據(jù)升降法疲勞試驗(yàn)結(jié)果，研究了材料42CrMo及其具有3Crl3電弧噴涂涂層的傳動(dòng)軸疲勞行為（不同涂層厚度下傳動(dòng)軸的扭轉(zhuǎn)疲勞極限），并提出采用修正系數(shù)來對(duì)高速電弧噴涂修復(fù)的再制造傳動(dòng)軸實(shí)現(xiàn)壽命預(yù)測(cè)；主要以臨界平面法中的Brown-Miller多軸疲勞模型為例，采用修正系數(shù)對(duì)多軸疲勞模型改造，最后結(jié)合多軸疲勞參數(shù)、各損傷參量，在幾種多軸疲勞模型下對(duì)傳動(dòng)軸新品和再制造傳動(dòng)軸分別進(jìn)行壽命預(yù)測(cè)和分析。 在國內(nèi)外對(duì)再制造和多軸疲勞研究現(xiàn)狀的基礎(chǔ)上，本文對(duì)熱噴涂技術(shù)處理的再制造鏟運(yùn)機(jī)傳動(dòng)軸進(jìn)行壽命預(yù)測(cè)。以噴涂后零件疲勞極限為基礎(chǔ)，，研究并提出了一種經(jīng)修正系數(shù)改造多軸疲勞模型的方法。該修正法適用于各種“加材料”方法得到的再制造產(chǎn)品的壽命預(yù)測(cè)。同時(shí)為如何判斷該類再制造零、部件的疲勞壽命提供了可靠的理論數(shù)據(jù)支持。
[Abstract]:Because of the increasingly tense energy sources, the impact of the deterioration of the climate environment, low carbon, environmental protection, energy conservation and emission reduction has become a topic of concern in the world. China has promised to reduce its carbon dioxide emissions per unit of GDP by 40% to 45 percent by 2020 compared with 2005. With the acceleration of industrialization and urbanization, with the price of iron ore rising, China has a large population and a low level of economic development. China is facing great pressure and challenge to achieve this emission reduction target. However, it is precisely this kind of rigid constraint index that has promoted the accelerated development of China's remanufacturing industry. As an advanced form of utilization of renewable resources, remanufacturing has created conditions for the development of circular economy, energy saving and emission reduction, and promoted the sustainable development of machinery industry. Whether the remanufacturing product can satisfy the use of the next life cycle directly determines the value and significance of the remanufacturing itself. This paper focuses on the life evaluation of the transmission shaft of the remanufacturing LHD. In this paper, the three-dimensional model of transmission shaft is established by using PRO/E software. The elastic-plastic finite element analysis of the shaft is carried out under the environment of ANSYS software Workbench, and the stress-strain data of dangerous parts are obtained. Then the critical plane and critical damage parameters of the shaft of the scraper are established and determined by the coordinate transformation principle. According to the fatigue test results of the lifting method, The fatigue behavior of 42CrMo and its transmission shaft with 3Crl3 arc spraying coating was studied. The torsional fatigue limit of transmission shaft with different coating thickness was studied. The correction coefficient was proposed to predict the life of remanufactured transmission shaft repaired by high speed arc spraying. Taking the Brown-Miller multiaxial fatigue model in the critical plane method as an example, the modified coefficient is adopted to modify the multiaxial fatigue model. Finally, the damage parameters are combined with the multiaxial fatigue parameters. Life prediction and analysis of new and remanufactured drive shafts are carried out under several multiaxial fatigue models. On the basis of the research status of remanufacturing and multiaxial fatigue at home and abroad, this paper predicts the life of the driving shaft of the remanufacturing scraper treated by thermal spraying technology, which is based on the fatigue limit of the sprayed parts. This paper studies and proposes a modified method for modifying the multiaxial fatigue model. The modified method is applicable to the life prediction of the remanufactured products obtained by various "adding materials" methods. At the same time, how to judge the remanufacturing zero of this kind of products is proposed. The fatigue life of components provides reliable theoretical data support.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH133.2

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本文編號(hào)：1516203