本文關(guān)鍵詞： 鋁合金薄壁件 有限元 低應(yīng)力 振動(dòng)時(shí)效 檢測(cè)技術(shù)　出處：《北華航天工業(yè)學(xué)院》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：鋁合金復(fù)雜薄壁件由于具有良好的綜合力學(xué)性能,已被廣泛用于導(dǎo)彈武器裝備系統(tǒng)、航空航天產(chǎn)品中,但其在實(shí)際加工生產(chǎn)中存在變形難控制、高精度尺寸及形位公差無(wú)法保證的問(wèn)題,追求結(jié)構(gòu)材料的輕量化,導(dǎo)致其無(wú)法滿足設(shè)計(jì)使用要求,使其在實(shí)際生產(chǎn)中受到制約。本文針對(duì)實(shí)際加工中遇到的幾個(gè)主要因素,采用理論和實(shí)踐相結(jié)合的方法,對(duì)鋁合金復(fù)雜薄壁件精密加工技術(shù)進(jìn)行了研究。本文具體研究?jī)?nèi)容如下:首先,對(duì)影響精密加工變形的殘余應(yīng)力進(jìn)行研究,找出合適的測(cè)量方法。應(yīng)用頻譜諧波振動(dòng)時(shí)效的方法消除殘余應(yīng)力,在此基礎(chǔ)上建立了有限元振動(dòng)時(shí)效仿真模型,優(yōu)化了進(jìn)給量、轉(zhuǎn)速、切深等主要切削工藝參數(shù),給出了消除內(nèi)應(yīng)力振動(dòng)時(shí)效參數(shù),并通過(guò)試驗(yàn)的方法進(jìn)行驗(yàn)證,為控制加工變形提供了理論依據(jù)。然后,分析了低應(yīng)力裝夾過(guò)程對(duì)精密加工的影響,建立綜合工件-工裝的剛度分析模型,利用有限元仿真技術(shù)分析對(duì)比了不同裝夾下應(yīng)力及變形情況,得出最優(yōu)的裝夾方案,并對(duì)裝夾及采樣點(diǎn)的分布確定進(jìn)行了研究,研究?jī)?yōu)化切削許用值對(duì)精密加工變形的影響,分析得出最優(yōu)的參數(shù)組合,實(shí)現(xiàn)低應(yīng)力裝夾在精密加工中的優(yōu)化應(yīng)用。最后,對(duì)結(jié)構(gòu)件進(jìn)行了精密加工性能的檢測(cè)和分析,以驗(yàn)證結(jié)構(gòu)件是否滿足型號(hào)使用要求。其中三維尺寸、內(nèi)部質(zhì)量、表面粗糙度、殘余應(yīng)力檢測(cè)用于結(jié)構(gòu)件質(zhì)量與缺陷檢測(cè),模態(tài)、振動(dòng)試驗(yàn)用于驗(yàn)證結(jié)構(gòu)件性能是否滿足使用需求。
[Abstract]:Aluminum alloy complex thin-walled parts have been widely used in missile weapon systems and aerospace products because of their good comprehensive mechanical properties, but the deformation is difficult to control in actual processing and production. The problems of high precision size and tolerance of shape and position can not be guaranteed, and the pursuit of lightweight structural materials leads to its inability to meet the requirements of design and use, which makes it restricted in actual production. This paper aims at several main factors encountered in practical processing. The precision machining technology of complex thin-walled aluminum alloy is studied by combining theory and practice. The main contents of this paper are as follows: firstly, the residual stress which affects the deformation of aluminum alloy is studied. The method of spectrum harmonic vibration aging is used to eliminate residual stress. On this basis, the finite element simulation model of vibration aging is established, and the main cutting process parameters, such as feed rate, rotational speed and cutting depth, are optimized. The vibration aging parameters for eliminating internal stress are given and verified by experimental method, which provides a theoretical basis for controlling machining deformation. Then, the influence of low stress clamping process on precision machining is analyzed. The stiffness analysis model of integrated workpiece and tooling is established. The stress and deformation under different clamps are analyzed and compared by using finite element simulation technology. The optimal clamping scheme is obtained, and the distribution of clamping and sampling points is studied. The effect of the allowable value of optimal cutting on the deformation of precision machining is studied, and the optimal parameter combination is obtained to realize the optimal application of low stress clamping in precision machining. Finally, the precision machining performance of structural parts is tested and analyzed. In order to verify that the structural parts meet the requirements of the use of the model. The three-dimensional dimension, internal quality, surface roughness, residual stress detection for structural quality and defect detection, modal, Vibration tests are used to verify that the performance of the structure meets the operational requirements.
【學(xué)位授予單位】：北華航天工業(yè)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG156.92;TG506

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本文編號(hào)：1548767