本文選題：航空薄壁件 + 車削加工�。� 參考：《沈陽航空航天大學(xué)》2016年碩士論文

【摘要】：隨著我國航空事業(yè)的快速發(fā)展,航空制造業(yè)對(duì)零件的使用性、安全性、環(huán)保性等各方面性能的要求不斷提高。為了提高推重比,飛機(jī)零部件廣泛使用薄壁整體結(jié)構(gòu)件,然而這類薄壁件尺寸大,剛性差,在加工過程中容易變形從而難以滿足加工要求,影響零件的使用性能乃至飛機(jī)服役壽命。針對(duì)航空發(fā)動(dòng)機(jī)二級(jí)低壓短筒機(jī)匣加工變形問題,論文通過有限元模擬仿真、ABAQUS軟件二次開發(fā)技術(shù)、切削實(shí)驗(yàn)等科學(xué)方法,實(shí)現(xiàn)了大型薄壁回轉(zhuǎn)體的加工變形預(yù)測(cè)并對(duì)影響薄壁件加工變形較為突出的裝夾問題做了研究。首先,通過對(duì)有限元方法切削方法的研究,探討動(dòng)態(tài)切削仿真、靜態(tài)切削仿真兩種建模方法的關(guān)鍵技術(shù),對(duì)比兩種方法的優(yōu)缺點(diǎn)�；贏BAQUS軟件的二次開發(fā)技術(shù),通過研究切削力載荷自動(dòng)加載與卸載和最大加工變形分析及識(shí)別等關(guān)鍵技術(shù),提出一種有限元快速仿真技術(shù)。其次,運(yùn)用ABAQUS有限元仿真軟件,建立高溫合金材料GH4169車削加工的三維動(dòng)態(tài)車削模型,分析工件的應(yīng)力場(chǎng)和溫度場(chǎng)的模擬結(jié)果,分析切削力在不同切削參數(shù)下的變化規(guī)律。再次,通過動(dòng)態(tài)車削仿真的切削力預(yù)測(cè)結(jié)果和有限元快速仿真技術(shù),運(yùn)用所開發(fā)軟件建立大型薄壁回轉(zhuǎn)體零件的車削加工變形預(yù)測(cè)模型,對(duì)薄壁回轉(zhuǎn)體的整體變形進(jìn)行預(yù)測(cè)。最后,對(duì)薄壁件加工變形影響較為突出的裝夾問題進(jìn)行研究,對(duì)比工件使用輔助支撐和無輔助支撐兩種條件下的加工變形計(jì)算結(jié)果,分析輔助支撐在切削加工中的作用,并研究不同輔助支撐元件數(shù)目、長(zhǎng)度、位置等因素對(duì)加工變形量的影響規(guī)律。
[Abstract]:With the rapid development of the aviation industry in China, the requirements of the aviation manufacturing industry for the performance of parts, such as usability, safety, environmental protection, etc. In order to improve the push-weight ratio, thin-walled integral parts are widely used in aircraft parts. However, such thin-walled parts are large in size and poor in rigidity, so they are easily deformed in the process of processing and are difficult to meet the processing requirements. It affects the performance of parts and even the service life of aircraft. In order to solve the problem of machining deformation of aeroengine two-stage low-pressure short cylinder casing, this paper uses finite element simulation software Abaqus software secondary development technology, cutting experiment and other scientific methods. The prediction of machining deformation of large thin-walled rotary body is realized and the clamping problem which affects the machining deformation of thin-walled parts is studied. Firstly, the key techniques of dynamic cutting simulation and static cutting simulation are discussed, and the advantages and disadvantages of the two methods are compared. Based on the secondary development technology of ABAQUS software, a fast finite element simulation technique is proposed by studying the key technologies such as automatic loading and unloading of cutting force load and maximum machining deformation analysis and identification. Secondly, using ABAQUS finite element simulation software, the three-dimensional dynamic turning model of GH4169 turning of superalloy material is established, and the simulation results of stress field and temperature field of workpiece are analyzed, and the variation law of cutting force under different cutting parameters is analyzed. Thirdly, through the cutting force prediction results of dynamic turning simulation and the fast finite element simulation technology, the prediction model of turning deformation of large thin-walled rotary parts is established by using the developed software, and the integral deformation of thin-walled rotary body is forecasted. Finally, this paper studies the clamping problem of thin-walled workpiece machining deformation, compares the calculation results of machining deformation between workpiece with auxiliary support and without auxiliary support, and analyzes the role of auxiliary support in cutting machining. The effects of the number, length and position of different auxiliary support elements on the machining deformation are studied.
【學(xué)位授予單位】：沈陽航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V263

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