本文選題：鈦合金圓弧榫齒 + 成型磨削�。� 參考：《南京航空航天大學(xué)》2015年碩士論文

【摘要】：鈦合金寬弦空心風(fēng)扇葉片作為先進(jìn)航空渦扇發(fā)動(dòng)機(jī)核心部件之一,其制造精度是影響發(fā)動(dòng)機(jī)涵道比和推重比進(jìn)一步提升的關(guān)鍵因素。圓弧榫齒是風(fēng)扇葉片連接葉盤(pán)的重要結(jié)構(gòu)形式,加工精度和表面質(zhì)量對(duì)風(fēng)扇葉片乃至渦扇發(fā)動(dòng)機(jī)性能有著重要影響。當(dāng)前,鈦合金榫齒主要存在加工質(zhì)量不穩(wěn)定、生產(chǎn)效率低、產(chǎn)品報(bào)廢率高以及刀具磨損嚴(yán)重等問(wèn)題。為此,本課題開(kāi)展了成型磨削和成型銑削加工鈦合金試驗(yàn),分別對(duì)提高工件輪廓精度、控制磨削燒傷以及切削振動(dòng)等方面進(jìn)行研究,實(shí)現(xiàn)了鈦合金圓弧榫齒的高效精密加工。本文完成的主要工作如下:1、鈦合金成型磨削試驗(yàn)研究中,通過(guò)分析砂輪形貌、修整效率,確定采用金剛石成形滾輪制作成形砂輪;綜合分析磨削力、力比和磨削比,通過(guò)優(yōu)化磨削行程與修整周期的關(guān)系,實(shí)現(xiàn)了工件輪廓精度的有效控制;分析了冷卻條件、工藝參數(shù)對(duì)磨削比能、磨削溫度的影響,提出控制磨削燒傷的對(duì)策及優(yōu)化參數(shù);最后進(jìn)行工件表面完整性分析,并對(duì)優(yōu)化參數(shù)進(jìn)行了驗(yàn)證。2、鈦合金成型銑削試驗(yàn)研究中,通過(guò)討論刀具材料、切削參數(shù)對(duì)切削力的影響,結(jié)合切削力頻域特性分析,優(yōu)化了成型銑削鈦合金的切削速度范圍;研究了成型銑削鈦合金時(shí)刀具的主要磨損、破損形式,并結(jié)合刀具耐用度制定了粗、精加工工藝參數(shù);最后對(duì)精加工條件下工件表面完整性進(jìn)行了分析。3、根據(jù)鈦合金圓弧榫齒結(jié)構(gòu)特點(diǎn)設(shè)計(jì)并制作了相應(yīng)的試驗(yàn)工裝和圓弧加工試件;依據(jù)某型風(fēng)扇葉片圓弧榫齒加工技術(shù)要求和毛坯實(shí)際加工余量,采用優(yōu)化的成型磨削、成型銑削工藝參數(shù),進(jìn)行了鈦合金圓弧榫齒高效精密加工試驗(yàn);最后對(duì)試件的輪廓精度和表面形貌進(jìn)行了分析,驗(yàn)證了加工工藝的可行性。
[Abstract]:As one of the core components of advanced aeronautical turbofan engine, the manufacture accuracy of titanium alloy wide chord hollow fan blade is the key factor that affects the further improvement of the ductility ratio and the push-weight ratio of the engine. Arc tenon is an important structural form of fan blade connecting disk. Machining accuracy and surface quality have important influence on the performance of fan blade and even turbofan engine. At present, the machining quality of titanium alloy tenon teeth is unstable, the production efficiency is low, the product scrap rate is high, and the tool wear is serious. Therefore, the experiments of forming grinding and milling titanium alloy were carried out in this paper. The research on improving the contour accuracy, controlling grinding burn and cutting vibration were carried out, and the high-efficiency precision machining of titanium alloy arc tenon teeth was realized. The main work accomplished in this paper is as follows: in the experimental study of titanium alloy forming grinding, through analyzing the grinding wheel morphology and dressing efficiency, the diamond forming roller is used to make the forming grinding wheel, and the grinding force, force ratio and grinding ratio are analyzed synthetically. By optimizing the relationship between grinding stroke and dressing cycle, the effective control of workpiece contour accuracy is realized, the effects of cooling conditions and process parameters on grinding specific energy and grinding temperature are analyzed, and the countermeasures and optimization parameters for controlling grinding burn are put forward. Finally, the surface integrity of the workpiece is analyzed, and the optimized parameters are verified. In the experimental study of titanium alloy forming and milling, the influence of cutting tool material and cutting parameters on cutting force is discussed, and the characteristics of cutting force in frequency domain are analyzed. The cutting speed range of forming and milling titanium alloy was optimized, the main wear and breakage forms of cutting tool in forming milling titanium alloy were studied, and the coarse and finishing processing parameters were made according to tool life. Finally, the surface integrity of the workpiece under finishing condition is analyzed. According to the structural characteristics of titanium alloy arc tenon teeth, the corresponding test tools and arc machining specimens are designed and manufactured. According to the technical requirement of machining arc tenon tooth of a fan blade and the actual machining allowance of blank, the high efficiency precision machining test of titanium alloy arc tenon tooth was carried out by adopting the optimized forming grinding and forming milling technology parameters. Finally, the contour accuracy and surface morphology of the specimen are analyzed, and the feasibility of the processing technology is verified.
【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】：2015
【分類(lèi)號(hào)】：V263.1

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