本文選題：面形再設(shè)計(jì) + 測(cè)量規(guī)劃系統(tǒng)��； 參考：《大連理工大學(xué)》2012年碩士論文

【摘要】：面形再設(shè)計(jì)類零件制造過程中設(shè)計(jì)、加工、測(cè)量互為上下游,具有環(huán)節(jié)多、要求高、信息量大、關(guān)系復(fù)雜等特點(diǎn)。幾何量測(cè)量作為面形再設(shè)計(jì)的基礎(chǔ)和最終零件檢驗(yàn)評(píng)價(jià)的依據(jù),在整個(gè)制造過程中至關(guān)重要,現(xiàn)有的測(cè)量方法難以滿足面形再設(shè)計(jì)零件制造過程中的測(cè)量要求。零件CAD模型包含了零件幾何信息,按照CAD模型進(jìn)行測(cè)量規(guī)劃,能極大提高測(cè)量精度和效率,研究面向面形再設(shè)計(jì)零件加工過程的CAD制導(dǎo)測(cè)量技術(shù)對(duì)多源約束面形再設(shè)計(jì)類零件制造理論和技術(shù)的發(fā)展具有重要意義。本論文提出了基于IGES表面模型的測(cè)量規(guī)劃系統(tǒng)開發(fā)方法,完成了測(cè)量規(guī)劃系統(tǒng)的總體設(shè)計(jì),研究了曲面的采樣策略、測(cè)量規(guī)劃和可視化顯示方法。 論文詳細(xì)分析了面形再設(shè)計(jì)零件制造過程中的測(cè)量要求,確定采用IGES作為測(cè)量規(guī)劃系統(tǒng)的開發(fā)基礎(chǔ),根據(jù)IGES特點(diǎn)和測(cè)量的任務(wù)要求分析了檢測(cè)規(guī)劃系統(tǒng)的開發(fā)工作,設(shè)計(jì)了軟件的功能模塊、制訂了軟件的開發(fā)方法和層次結(jié)構(gòu)。 針對(duì)一般曲面測(cè)量要求,提出均勻采樣和按照曲率變化進(jìn)行中點(diǎn)二次采樣相結(jié)合的采樣方法,并基于該方法為IGES中常見的三類曲面分別設(shè)計(jì)了采樣規(guī)則。為剔除被裁剪區(qū)域的采樣點(diǎn),提出將曲面及其邊界映射到歸一化的二維參數(shù)空間,在參數(shù)空間對(duì)被裁剪點(diǎn)進(jìn)行剔除的方法。為解決典型特征面的測(cè)量和評(píng)價(jià)問題,設(shè)計(jì)了典型特征面的識(shí)別以及被分割旋轉(zhuǎn)面的重構(gòu)方法,研究了典型特征面的Hamersley采樣。研究的采樣策略為實(shí)現(xiàn)零件表面信息的精確高效測(cè)量提供了保障。 針對(duì)測(cè)量方向和速度影響測(cè)量精度和效率的問題,設(shè)計(jì)了沿曲面法線進(jìn)行測(cè)量的測(cè)量方法,研究了各類曲面法線的計(jì)算方法,并對(duì)定位點(diǎn)、測(cè)量行程、測(cè)量順序等進(jìn)行了規(guī)劃。為識(shí)別零件各面的拓?fù)浣Y(jié)構(gòu)以合理安排測(cè)量路徑規(guī)劃和避障,研究了邊界匹配流程和方法。為零件整體測(cè)量規(guī)劃奠定了基礎(chǔ)。 為提高系統(tǒng)靈活性和適用范圍,采用基于OpenGL的測(cè)量對(duì)象和過程可視化技術(shù),研究了將旋轉(zhuǎn)面和列表柱面轉(zhuǎn)化為NURBS曲面表達(dá)的方法,并設(shè)計(jì)了轉(zhuǎn)化算法。模擬結(jié)果表明,設(shè)計(jì)的轉(zhuǎn)化算法和顯示方法能很好的實(shí)現(xiàn)CAD模型及規(guī)劃路徑的顯示。 綜上所述,本論文研究的測(cè)量方法和技術(shù),能滿足面形再設(shè)計(jì)類零件制造過程中的測(cè)量要求,為進(jìn)一步研究面形再設(shè)計(jì)類零件加工理論和技術(shù)提供了理論參考和實(shí)踐保障,具有一定的參考價(jià)值。
[Abstract]:The design, processing and measurement of surface redesigned parts are upstream and downstream, with many links, high requirements, large amount of information and complex relationships. As the basis of surface redesign and the basis of final part inspection and evaluation, geometric measurement is of great importance in the whole manufacturing process, and the existing measurement methods are difficult to meet the measurement requirements in the manufacturing process of surface redesigned parts. The part CAD model contains the geometric information of the part. According to the CAD model, the measurement precision and efficiency can be greatly improved. It is of great significance to study the CAD guidance and measurement technology for the machining process of surface redesigned parts, which is of great significance to the development of the manufacturing theory and technology of multi-source constrained surface redesigned parts. In this paper, a method of developing measurement planning system based on IGES surface model is proposed, and the overall design of measurement planning system is completed. The sampling strategy, measurement planning and visual display method of surface are studied. In this paper, the measurement requirements in the manufacturing process of the surface redesigned parts are analyzed in detail, and the IGES is adopted as the development basis of the measurement planning system. According to the characteristics of the IGES and the requirements of the measurement task, the development work of the inspection planning system is analyzed. The function module of the software is designed, and the development method and hierarchy of the software are worked out. According to the requirements of general surface measurement, a sampling method based on uniform sampling and mid-point quadratic sampling according to curvature change is proposed. Based on this method, the sampling rules are designed for three kinds of surfaces that are common in IGES. In order to eliminate the sample points of the clipped region, a method is proposed to remove the clipped points in the parametric space by mapping the surface and its boundary to a normalized two-dimensional parametric space. In order to solve the problem of measuring and evaluating the typical feature surface, the recognition of the typical feature surface and the reconstruction method of the segmented rotating surface are designed, and the Hamersley sampling of the typical characteristic surface is studied. The studied sampling strategy provides a guarantee for the accurate and efficient measurement of the surface information of parts. Aiming at the problem that the direction and speed of the measurement affect the accuracy and efficiency of the measurement, the measurement method along the normal line of the curved surface is designed, the calculation method of the normal line of the various surfaces is studied, and the positioning point, the measuring stroke and the measuring sequence are planned. In order to identify the topological structure of each surface of the part and arrange the measuring path planning and obstacle avoidance, the boundary matching flow and method are studied. It lays a foundation for the whole measuring plan of parts. In order to improve the flexibility and applicability of the system, the method of transforming the rotating surface and the list cylinder surface into the representation of the NURBS surface is studied by using the OpenGL based measurement object and process visualization technology, and the transformation algorithm is designed. The simulation results show that the proposed transformation algorithm and display method can well display the CAD model and the planning path. To sum up, the measurement methods and techniques studied in this paper can meet the measurement requirements in the manufacturing process of surface redesigned parts, and provide a theoretical reference and practical guarantee for further research on the theory and technology of surface redesign parts. It has certain reference value.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH122

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