本文關(guān)鍵詞： 航發(fā)葉片 葉根和阻尼臺轉(zhuǎn)接R 砂帶磨削 磨拋工具系統(tǒng) 磨削工藝　出處：《重慶大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：葉片作為航空發(fā)動機(jī)的關(guān)鍵零件之一,對航空發(fā)動機(jī)的性能有著至關(guān)重要的影響。葉根和阻尼臺轉(zhuǎn)接R處葉片厚度突變,應(yīng)力集中現(xiàn)象十分嚴(yán)重,故在葉片高負(fù)荷運(yùn)轉(zhuǎn)過程中,易在應(yīng)力集中處產(chǎn)生斷裂,導(dǎo)致葉片報(bào)廢,嚴(yán)重影響航空發(fā)動機(jī)的安全性和壽命。當(dāng)前普遍采用手工打磨的方式對葉根和阻尼臺轉(zhuǎn)接R進(jìn)行加工,但其磨效率低,次品率高,且容易在轉(zhuǎn)接R處形成刮痕,加劇應(yīng)力集中。現(xiàn)有的數(shù)控砂帶磨削技術(shù)在葉片型面的加工中已經(jīng)得到了很好的應(yīng)用,但由于葉根和阻尼臺轉(zhuǎn)接R曲率半徑小,使得現(xiàn)有的砂帶磨削技術(shù)和裝置難以對葉根和阻尼臺轉(zhuǎn)接R進(jìn)行有效加工。為了能夠?qū)崿F(xiàn)葉根和阻尼臺轉(zhuǎn)接R的自動化加工,本課題針對其加工特點(diǎn),提出一種新型開式砂帶磨削技術(shù),設(shè)計(jì)一套拋磨工具系統(tǒng),并進(jìn)行磨削工藝研究,為實(shí)現(xiàn)葉根和阻尼臺轉(zhuǎn)接R的磨削加工提供指導(dǎo)�；谛滦烷_式砂帶磨削技術(shù)的理論分析,研究新型開式砂帶磨削系統(tǒng)的動態(tài)特性,并建立基于阿基米德螺旋線原理的卷繞系統(tǒng)數(shù)學(xué)模型�；谏鲜隼碚摲治�,針對航空發(fā)動機(jī)葉片葉根和阻尼臺轉(zhuǎn)接R的加工技術(shù)要求,進(jìn)行磨拋機(jī)構(gòu)、驅(qū)動機(jī)構(gòu)、張緊機(jī)構(gòu)、壓力控制機(jī)構(gòu)等關(guān)鍵部件的分析設(shè)計(jì),設(shè)計(jì)一套新型的開式砂帶磨拋工具系統(tǒng);針對上述研制的磨拋工具系統(tǒng),對其靜力學(xué)特性和振動特性進(jìn)行有限元分析,驗(yàn)證其強(qiáng)度、靜剛度和動態(tài)特性;在上述研究的基礎(chǔ)上,通過正交試驗(yàn),探究鈦合金材料新型開式砂帶磨削參數(shù)對表面粗糙度和磨削深度的影響規(guī)律,并采用灰色關(guān)聯(lián)分析法對磨削參數(shù)進(jìn)行優(yōu)化分析。利用優(yōu)化后的磨削參數(shù)對葉根和阻尼臺轉(zhuǎn)接R進(jìn)行工藝試驗(yàn),驗(yàn)證所設(shè)計(jì)的拋磨工具系統(tǒng)加工葉根和阻尼臺轉(zhuǎn)接R的可行性和有效性。
[Abstract]:As one of the key parts of the aero-engine, the blade has a vital influence on the performance of the aero-engine. The blade thickness changes at the blade root and damping table connecting R, and the stress concentration is very serious, so in the process of the blade running at high load, It is easy to break at the stress concentration, leading to blade scrapping, which seriously affects the safety and life of aero-engine. At present, manual grinding is widely used to process the blade root and the transfer R of damping table, but its grinding efficiency is low, and the rate of defective products is high. The existing NC abrasive belt grinding technology has been applied well in the machining of the blade profile, but because of the small radius of curvature of the blade root and damping table connecting R, it is easy to form scratches at the transfer R and increase the stress concentration. It is difficult for the existing abrasive belt grinding technology and equipment to process the blade root and damping table transfer R effectively. In order to realize the automatic machining of blade root and damping table transfer R, this subject aims at its processing characteristics. A new open belt grinding technology is proposed, a set of grinding tool system is designed, and grinding technology is studied, which provides guidance for the grinding process of blade root and damping table connecting R. Based on the theoretical analysis of new open belt grinding technology, The dynamic characteristics of the new open belt grinding system are studied, and the mathematical model of the winding system based on the Archimedes helix principle is established. Based on the above theoretical analysis, the processing technology requirements of the blade root of the aeroengine blade and the transfer R of the damping table are discussed. To analyze and design the key parts such as grinding mechanism, driving mechanism, tensioning mechanism, pressure control mechanism and so on, to design a set of new open abrasive belt grinding tool system, aiming at the grinding tool system developed above, Finite element analysis of its static and vibration characteristics is carried out to verify its strength, static stiffness and dynamic characteristics. The effect of grinding parameters on surface roughness and grinding depth of a new type of open abrasive belt for titanium alloy materials was investigated. The grinding parameters are optimized by grey correlation analysis. The technological tests of blade root and damping table transfer R are carried out by using the optimized grinding parameters. The feasibility and effectiveness of the designed polishing tool system for machining blade root and damping table transfer R are verified.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：V263

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