空心葉片自適應(yīng)加工模型匹配技術(shù)研究
本文選題:空心葉片 + 自適應(yīng)加工; 參考:《南京航空航天大學(xué)》2017年碩士論文
【摘要】:寬弦空心風扇葉片是渦扇發(fā)動機的重要零件之一,其加工質(zhì)量直接影響著發(fā)動機的性能。目前,寬弦空心風扇葉片多采用“超塑成型/擴散連接(SPF/DB)+機械加工”的方式制造而成。寬弦空心風扇葉片機械加工面臨著毛坯個性化、余量分布不均勻、外形加工受內(nèi)形約束等問題,自適應(yīng)加工技術(shù)是解決此類問題的有效手段。針對空心葉片自適應(yīng)數(shù)控加工中實際毛坯與零件加工模型不匹配的情況,研究了空心葉片自適應(yīng)加工模型匹配技術(shù)。論文的主要研究內(nèi)容與工作包括以下四個方面:(1)研究了寬弦空心風扇葉片外形及壁厚在機測量技術(shù)。闡述了寬弦空心風扇葉片外形及壁厚在機測量方法,提出了外形測量時測頭半徑補償及壁厚測量時法矢方向找正的方案。(2)研究了基于測量數(shù)據(jù)的模型重建技術(shù);诮Y(jié)構(gòu)點數(shù)據(jù),研究了NURBS曲面插值技術(shù),建立了葉片模型;基于散亂點數(shù)據(jù),研究了一種三角網(wǎng)格重構(gòu)方法,建立了葉片網(wǎng)格模型。(3)研究了基于自由變形技術(shù)的模型修改方法。針對空心葉片數(shù)控加工時加工模型與毛坯不匹配的情況,研究了模型自由變形技術(shù),修改了葉片加工模型。(4)基于本文提出的理論算法,針對空心葉片試驗件進行了自適應(yīng)數(shù)控加工,成功完成了葉片進排氣邊圓角加工,驗證了本文算法的正確性。
[Abstract]:Wide chord hollow fan blade is one of the important parts of turbofan engine, and its machining quality directly affects the performance of the engine. At present, the wide-chord hollow fan blades are manufactured by superplastic forming / diffusion bonding SPF / DBmachining. The machining of wide chord hollow fan blade is faced with some problems such as individuation of blank uneven distribution of allowance and constraint of shape. Adaptive machining technology is an effective method to solve this kind of problem. In view of the mismatch between the actual blank and the machining model of parts in adaptive NC machining of hollow blade, the matching technology of adaptive machining model for hollow blade is studied. The main contents and work of this paper include the following four aspects: 1) the measurement technology of blade shape and wall thickness of wide chord hollow fan is studied. The measurement method of the blade shape and wall thickness of wide chord hollow fan is described. The scheme of compensating the radius of the probe and the normal vector direction in the measurement of wall thickness is put forward.) the model reconstruction technology based on the measurement data is studied. Based on the structural point data, the Nurbs surface interpolation technology is studied, and the blade model is established, and a triangular mesh reconstruction method based on scattered point data is studied. The blade mesh model. 3) the model modification method based on free deformation technology is studied. In view of the mismatch between machining model and blank in NC machining of hollow blade, the free deformation technology of the model is studied, and the blade machining model is modified. (4) based on the theoretical algorithm proposed in this paper, The self-adaptive NC machining for the hollow blade is carried out, and the machining of the inlet and exhaust edges of the blade is successfully completed, which verifies the correctness of the algorithm in this paper.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TG659
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