發(fā)布時(shí)間：2018-05-30 00:44

  本文選題：逆向工程 + 數(shù)據(jù)測(cè)量　； 參考：《華北電力大學(xué)》2011年碩士論文

【摘要】：反求工程是先進(jìn)制造技術(shù)的重要手段,分為數(shù)據(jù)獲取、數(shù)據(jù)預(yù)處理、數(shù)據(jù)分塊與曲面重構(gòu)、CAD模型構(gòu)造以及快速原型等五大關(guān)鍵技術(shù)。利用反求工程可重構(gòu)產(chǎn)品零件的實(shí)體模型,也可對(duì)原型進(jìn)行修改和再設(shè)計(jì)。通過逆向工程,建立和掌握自己的產(chǎn)品開發(fā)設(shè)計(jì)技術(shù),進(jìn)行產(chǎn)品的創(chuàng)新設(shè)計(jì),是提升我國(guó)制造業(yè)技術(shù)水平的重要手段。 本文以典型的復(fù)雜曲面零件汽輪機(jī)葉片的反求過程為例,研究了復(fù)雜曲面的反求設(shè)計(jì)過程,實(shí)現(xiàn)了反求工程中設(shè)計(jì)與制造的一體化。 首先介紹了數(shù)字化測(cè)量的原理與方法,分析了接觸式測(cè)量與非接觸式測(cè)量的特點(diǎn),探討了接觸式三坐標(biāo)測(cè)量機(jī)測(cè)量曲面的過程。在現(xiàn)有測(cè)量方法的基礎(chǔ)上提出了豎直縱向采點(diǎn)的測(cè)量方案,該方案不僅提高了采點(diǎn)速度,也利于以后提高曲面重構(gòu)精度。最后利用GLOBAL 575型三坐標(biāo)測(cè)量機(jī)得到了葉片的數(shù)字化點(diǎn)云數(shù)據(jù)。 在曲面重構(gòu)的原理基礎(chǔ)上,經(jīng)過數(shù)據(jù)預(yù)處理后,采用CATIA V5軟件,通過點(diǎn)-線-面的曲面重構(gòu)方式,重構(gòu)了葉片的三維模型。利用曲面偏置命令,解決了三坐標(biāo)測(cè)量機(jī)的半徑補(bǔ)償誤差問題。 在葉片曲面重構(gòu)的基礎(chǔ)上,分析了葉片的加工工藝,確定了葉片加工的切削參數(shù)和走刀路線。利用UG NX 7.0的CAM功能模塊,結(jié)合葉片的結(jié)構(gòu)特點(diǎn)及四軸加工中心的特點(diǎn),規(guī)劃了刀路軌跡,完成了汽輪機(jī)葉片的四軸加工,并進(jìn)行了加工仿真。結(jié)合現(xiàn)有加工條件,通過選擇合適的加工參數(shù),對(duì)加工過程進(jìn)行后置處理,生成了數(shù)控加工NC代碼。最后利用數(shù)控加工中心及線切割完成了葉片的實(shí)體加工。
[Abstract]:Reverse engineering is an important means of advanced manufacturing technology, which includes five key technologies: data acquisition, data preprocessing, data partition and surface reconstruction, CAD model construction and rapid prototyping. The prototype can also be modified and redesigned by using the solid model of reconfigurable parts in reverse engineering. Through reverse engineering, it is an important means to improve the technological level of our manufacturing industry to establish and master their own product development and design technology and carry out product innovation design. In this paper, the reverse design process of complex curved surface is studied, and the integration of design and manufacture in reverse engineering is realized by taking the reverse process of turbine blade of typical complex curved surface part as an example. Firstly, the principle and method of digital measurement are introduced, the characteristics of contact measurement and non-contact measurement are analyzed, and the process of measuring curved surface by contact CMM is discussed. Based on the existing measurement methods, a vertical sampling point measurement scheme is proposed, which not only improves the sampling speed, but also improves the precision of surface reconstruction in the future. Finally, the digital point cloud data of the blade are obtained by using GLOBAL 575 CMM. Based on the principle of surface reconstruction, after data preprocessing, the blade 3D model is reconstructed by using CATIA V5 software and the method of point-line-surface reconstruction. The radius compensation error of CMM is solved by using curved surface offset command. Based on the reconstruction of blade surface, the machining technology of blade is analyzed, and the cutting parameters and cutting path are determined. Based on the CAM function module of UG NX7.0, combined with the structural characteristics of the blade and the characteristics of the four-axis machining center, the path of the cutter path was planned, the four-axis machining of the turbine blade was completed, and the machining simulation was carried out. According to the existing machining conditions, NC codes of NC machining are generated by selecting suitable machining parameters and postprocessing the machining process. Finally, the solid machining of blade is finished by NC machining center and wire cutting.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH122;TP391.7

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本文編號(hào)：1953183