本文關(guān)鍵詞： 快速成型 直接分層 混合填充 均勻壁厚 填充路徑　出處：《內(nèi)蒙古科技大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：快速成型技術(shù)(Rapid Prototyping，簡稱RP)，又稱快速原型制造技術(shù)，是基于離散/堆積的成型思想，用積分法原理來制造三維實(shí)體的。RP技術(shù)突破了傳統(tǒng)加工中“減材料”的工藝方法；將計(jì)算機(jī)上建模的零件三維CAD模型沿高度方向按一定厚度分層切片，得到每層的截面信息；然后輸出到快速成型設(shè)備上逐層填充，再沿高度方向上粘結(jié)疊加，逐步成型三維實(shí)體。 目前市場(chǎng)上FDM工藝的快速成型系統(tǒng)只能讀取STL格式文件，，而STL格式文件是CAD模型的近似表達(dá)，即用一系列三角形平面片近似的表示CAD模型的數(shù)據(jù)文件，本身存在零件的幾何失真現(xiàn)象�；诖烁袷竭M(jìn)行分層得到的二維層片是由直線段相連而成的多邊形輪廓，使得模型層片信息也存在幾何失真，從而導(dǎo)致快速成型件表面精度比較差；再有目前截面內(nèi)部填充均采用平行的直線段，對(duì)于薄壁類截面的填充，生成的填充路徑呈鋸齒形，還存在不連續(xù)和不均勻現(xiàn)象，使得成型件存在壁厚不均勻、物理性能差等問題。 針對(duì)基于STL模型分層所產(chǎn)生幾何失真的問題，本課題提出直接對(duì)CAD模型進(jìn)行分層，并通過AutoCAD二次開發(fā)工具實(shí)現(xiàn)了在軟件中的直接分層，所得層片的二維輪廓為光滑曲線，從而保證成型件精度。針對(duì)均勻壁厚薄壁類零件截面內(nèi)部填充軌跡的問題，本課題提出在Z方向采用兩種軌跡混合填充的方法，即奇數(shù)層采用平行的直線段填充，偶數(shù)層采用輪廓軌跡偏置線填充；并通過AutoCAD2002二次開發(fā)工具ObjectARX2002在Visual C++6.0開發(fā)平臺(tái)上實(shí)現(xiàn)軟件的開發(fā)；運(yùn)行編制好的軟件可在AutoCAD2002中實(shí)現(xiàn)這兩種軌跡的模擬，并分別計(jì)算填充路徑的長度；通過顯示結(jié)果分析，這種方法不僅緩解了平行線填充帶來的一系列弊端，同時(shí)在很大程度上提高了快速成型效率。通過本課的研究，實(shí)現(xiàn)了在不增加成本條件下，提高成型效率、制件精度和完善成型件性能，從而為下一步擴(kuò)展到快速成型設(shè)備提供可行性。
[Abstract]:Rapid Prototyping, also called Rapid Prototyping, is based on the idea of discrete / stacking. The 3D CAD model of the parts modeled on the computer is sliced along the height direction according to a certain thickness, and the section information of each layer is obtained, and then output to the rapid prototyping equipment to fill layer by layer, and then it is bonded and superimposed along the height direction. Step by step forming three-dimensional entity. At present, the rapid prototyping system of FDM process can only read the STL format file in the market, and the STL format file is the approximate expression of the CAD model, that is, a series of triangular plane slices are used to approximate represent the CAD model data file. There is geometric distortion of the part itself. The two-dimensional laminates based on this scheme are polygonal contours connected by straight lines, which make the information of the model layers also have geometric distortion. As a result, the surface accuracy of rapid prototyping parts is poor. At present, parallel straight lines are used in the filling of sections. For thin-walled cross-sections, the filling path is serrated, and there is discontinuity and non-uniformity. The forming parts have the problems of uneven wall thickness and poor physical properties. In order to solve the problem of geometric distortion caused by stratification based on STL model, this paper proposes a direct delamination of CAD model, and realizes the direct delamination in software by AutoCAD secondary development tool. The two-dimensional contour of the resulting layer is a smooth curve. In order to ensure the precision of the forming parts, aiming at the problem of filling trajectory in the section of thin-walled parts with uniform wall thickness, this paper puts forward two methods of mixed filling in Z direction, that is, the odd layer is filled with parallel straight lines. The even layer is filled with contour trajectory bias line, and the software is developed on Visual C 6.0 platform through AutoCAD2002 secondary development tool ObjectARX2002. The software can be used to simulate the two trajectories in AutoCAD2002. This method not only alleviates a series of disadvantages brought by parallel line filling, but also improves the efficiency of rapid prototyping to a great extent. Under the condition of no increasing the cost, the forming efficiency, the precision and the performance of the molded parts are improved, which provides the feasibility for the next step to extend to the rapid prototyping equipment.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH164

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本文編號(hào)：1536318