本文關(guān)鍵詞： 寬弦空心葉片 適應(yīng)性加工 路徑規(guī)劃 配準(zhǔn) 模型再設(shè)計(jì)　出處：《南京航空航天大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：寬弦空心葉片是大推重比航空發(fā)動(dòng)機(jī)的關(guān)鍵零部件之一,其加工質(zhì)量對(duì)航空發(fā)動(dòng)機(jī)的性能有重要的影響。目前,寬弦空心葉片的一種典型復(fù)合制造流程是先采用超塑性成形/擴(kuò)散連接獲得與葉片最終尺寸形狀十分接近的葉片毛坯,然后采用適應(yīng)性數(shù)控切削對(duì)前緣、后緣等部位進(jìn)行加工以保證其精度。因此,適應(yīng)性加工技術(shù)是寬弦空心葉片加工過(guò)程中的一項(xiàng)關(guān)鍵技術(shù)。本文以航空寬弦空心葉片制造為應(yīng)用背景,對(duì)葉片適應(yīng)性加工中激光掃描測(cè)量路徑規(guī)劃、毛坯測(cè)量數(shù)據(jù)定位以及前后緣型面再設(shè)計(jì)等關(guān)鍵技術(shù)進(jìn)行研究,并開發(fā)葉片激光掃描測(cè)量規(guī)劃和適應(yīng)性修形軟件系統(tǒng)。本文研究的主要內(nèi)容和創(chuàng)新點(diǎn)概況如下:1.研究了激光掃描測(cè)量路徑規(guī)劃技術(shù)。提出一種基于K-Means的測(cè)頭位姿規(guī)劃算法,通過(guò)該算法計(jì)算出完成葉片毛坯型面測(cè)量所需最少的激光測(cè)頭位姿以及每個(gè)位姿下的測(cè)量點(diǎn)集;研究了基于激光掃描測(cè)量特性和測(cè)量點(diǎn)排序的測(cè)量路徑計(jì)算方法。2.研究了葉片毛坯測(cè)量點(diǎn)云和CAD模型數(shù)據(jù)配準(zhǔn)技術(shù)。給出了以葉盆葉背為基準(zhǔn)的葉片毛坯測(cè)量點(diǎn)云配準(zhǔn)方法。3.研究了葉片前后緣再設(shè)計(jì)方法。提出一種基于葉片截面線關(guān)鍵點(diǎn)調(diào)整的前后緣再設(shè)計(jì)方法,該方法在對(duì)前后緣輪廓線的設(shè)計(jì)公差和毛坯加工余量分析基礎(chǔ)上得到輪廓的可調(diào)整區(qū)域,利用余量約束下的模型配準(zhǔn)得到實(shí)際調(diào)整的旋轉(zhuǎn)分量,并優(yōu)化平移調(diào)整量,生成再設(shè)計(jì)后的前后緣輪廓線。4.在對(duì)理論和算法研究的基礎(chǔ)上,使用UG提供的UG/OPEN工具包自主開發(fā)了葉片測(cè)量規(guī)劃和適應(yīng)性修形軟件系統(tǒng),并以某寬弦葉片為實(shí)例檢驗(yàn)了系統(tǒng)各個(gè)功能。
[Abstract]:The wide chord hollow blade is one of the key parts of the large thrust weight ratio aero-engine, and its machining quality has an important effect on the performance of the aeroengine. A typical composite manufacturing process for wide chord hollow blades is to use superplastic forming / diffusion bonding to obtain blade blanks that are very close to the final size and shape of the blade, and then apply adaptive NC cutting to the leading edge. Therefore, adaptive machining technology is a key technology in the machining process of wide chord hollow blade. This paper takes the manufacture of aviation wide chord hollow blade as the application background. The key technologies such as path planning of laser scanning measurement, positioning of blank measurement data and redesigning of front and rear edge surface in blade adaptive machining are studied. The main contents and innovations of this paper are as follows: 1. The path planning technology of laser scanning measurement is studied, and an algorithm of head position and pose planning based on K-Means is proposed. By using this algorithm, the position and pose of the laser probe and the set of measuring points under each position are calculated, which are the least needed to complete the measurement of the blank surface of the blade. The calculation method of measuring path based on laser scanning measurement characteristic and measuring point ranking is studied. 2. The registration technology of cloud and CAD model data for blade blank measurement is studied. The measuring point of blade blank based on the back of leaf basin is given. Cloud registration method .3.The method of blade front and rear edge redesign is studied. A new method of front and rear edge redesign based on the key point adjustment of blade cross section line is proposed. Based on the analysis of the design tolerances of the front and rear contour lines and the margin of the blank machining, the adjustable region of the contour is obtained, and the actual adjusted rotation component is obtained by the model registration under the residual constraints, and the translation adjustment quantity is optimized. On the basis of the research on theory and algorithm, the software system of blade measurement planning and adaptive shape modification is developed by using the UG/OPEN toolkit provided by UG. Taking a wide chord blade as an example, all functions of the system are tested.
【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】：2016
【分類號(hào)】：V232.4

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