本文選題：三角網(wǎng)格 + CL路徑法�。� 參考：《廣東工業(yè)大學(xué)》2017年博士論文

【摘要】：近年來(lái),隨著航空航天、汽車、模具及消費(fèi)產(chǎn)品等行業(yè)的快速發(fā)展,復(fù)雜曲面零件得到了越來(lái)越多的應(yīng)用。三角網(wǎng)格模型可用于曲面零件的外觀表達(dá),具有快速靈活及拓?fù)溥m應(yīng)能力強(qiáng)的優(yōu)點(diǎn),在增材制造、質(zhì)量檢測(cè)、再設(shè)計(jì)與再制造工程等相關(guān)技術(shù)領(lǐng)域得到了廣泛應(yīng)用�；谌蔷W(wǎng)格模型的直接數(shù)控加工可避免反求曲面模型的繁瑣操作、誤差控制及曲面質(zhì)量等問(wèn)題,是實(shí)現(xiàn)快速制造的一個(gè)重要途徑。然而,三角網(wǎng)格模型僅由網(wǎng)格面片組成,在數(shù)控代碼生成、加工精度及加工質(zhì)量等方面仍存在問(wèn)題,并有待于進(jìn)一步的研究。本論文針對(duì)三角網(wǎng)格模型直接數(shù)控加工中的刀具軌跡生成方法,開(kāi)展較為深入的研究�；贑L路徑法的三角網(wǎng)格模型實(shí)驗(yàn)加工與缺陷分析,提出一種面向復(fù)雜曲面網(wǎng)格模型的刀具軌跡生成新方法,其中包括網(wǎng)格模型的頂點(diǎn)偏置方法、離散誤差補(bǔ)償?shù)牡段稽c(diǎn)生成算法及雙向插值的刀具軌跡生成算法,開(kāi)發(fā)復(fù)雜曲面網(wǎng)格模型的直接數(shù)控加工系統(tǒng),生成復(fù)雜曲面網(wǎng)格模型的刀具軌跡,實(shí)現(xiàn)三角網(wǎng)格模型的直接數(shù)控加工。本論文的主要研究?jī)?nèi)容包括以下幾個(gè)方面:(1)深入調(diào)研復(fù)雜曲面網(wǎng)格模型的直接數(shù)控加工方法,了解該領(lǐng)域的國(guó)內(nèi)外研究現(xiàn)狀,分析目前三角網(wǎng)格模型刀具軌跡生成的CL路徑法,指明當(dāng)前三角網(wǎng)格模型刀具軌跡生成中存在的關(guān)鍵技術(shù)問(wèn)題,確定本論文的研究?jī)?nèi)容與實(shí)施方案。(2)基于模型文件的格式描述,分析網(wǎng)格模型的質(zhì)量問(wèn)題對(duì)刀具軌跡生成的影響,提出模型數(shù)據(jù)的拓?fù)渲貥?gòu)方法,為網(wǎng)格模型的刀具軌跡生成提供有效的模型數(shù)據(jù)。基于網(wǎng)格模型的CL路徑法,實(shí)現(xiàn)粗細(xì)兩種網(wǎng)格模型的實(shí)際加工,分析加工零件的表面質(zhì)量,發(fā)現(xiàn)網(wǎng)格模型加工表面出現(xiàn)的凸面凹坑、凹面凹槽及區(qū)域三角化缺陷問(wèn)題,明確目前網(wǎng)格模型CL路徑法的關(guān)鍵技術(shù)問(wèn)題。(3)研究網(wǎng)格模型的頂點(diǎn)偏置方法,提出基于邊界頂點(diǎn)相鄰網(wǎng)格面片補(bǔ)齊的邊界頂點(diǎn)法矢修正算法及基于相鄰面片偏置誤差加權(quán)的頂點(diǎn)偏置距離補(bǔ)償算法,有效改善三角網(wǎng)格模型的偏置效果。針對(duì)邊界頂點(diǎn)法矢計(jì)算偏差所引起的加工過(guò)切問(wèn)題,通過(guò)邊界頂點(diǎn)相鄰網(wǎng)格面片補(bǔ)齊的邊界頂點(diǎn)法矢修正計(jì)算,消除邊界區(qū)域的實(shí)際加工問(wèn)題�；谄媚Ｐ偷膶�(shí)際偏置距離,分析模型偏置距離不足造成加工過(guò)切問(wèn)題,通過(guò)基于相鄰面片偏置誤差加權(quán)的頂點(diǎn)偏置距離補(bǔ)償,減小偏置模型的偏置誤差。(4)研究偏置模型的刀位點(diǎn)生成方法,提出基于近似曲面輪廓曲線截平面求交的離散誤差補(bǔ)償?shù)段稽c(diǎn)生成算法,避免三角網(wǎng)格模型離散誤差造成的刀位點(diǎn)計(jì)算精度問(wèn)題。在走刀方式選擇及殘留高度計(jì)算的基礎(chǔ)上,詳細(xì)研究偏置模型刀位點(diǎn)生成的截平面求交法,探討截平面與網(wǎng)格面片的位置關(guān)系,給出截面交點(diǎn)的計(jì)算方法。詳細(xì)分析三角網(wǎng)格模型離散誤差對(duì)截面交點(diǎn)計(jì)算精度的影響,重點(diǎn)研究網(wǎng)格模型加工零件表面的缺陷機(jī)理,通過(guò)刀位點(diǎn)的離散誤差補(bǔ)償,改善刀位點(diǎn)的計(jì)算精度。(5)研究刀位點(diǎn)的刀具軌跡生成方法及刀具軌跡的插補(bǔ)算法,提出雙向插值的刀具軌跡生成算法,實(shí)現(xiàn)刀具軌跡的光滑處理。采用三次非均勻B樣條曲線插值的方法,實(shí)現(xiàn)截平面方向的刀具軌跡生成及光順處理。通過(guò)刀位點(diǎn)的雙向插值,解決垂直于截平面方向的刀具軌跡連接問(wèn)題�；谧叩恫介L(zhǎng)與逼近誤差的幾何關(guān)系,分析樣條曲線的插補(bǔ)方法,通過(guò)等參數(shù)直線逼近的方法,實(shí)現(xiàn)刀具軌跡的插補(bǔ)點(diǎn)坐標(biāo)計(jì)算。(6)基于三角網(wǎng)格模型的刀具軌跡生成方法,開(kāi)發(fā)了復(fù)雜曲面網(wǎng)格模型的直接數(shù)控加工系統(tǒng),實(shí)現(xiàn)了本論文提出的面向復(fù)雜曲面網(wǎng)格模型刀具軌跡生成新方法。通過(guò)多個(gè)實(shí)例模型的加工實(shí)驗(yàn)與結(jié)果分析,對(duì)刀具軌跡生成新方法的有效性進(jìn)行了驗(yàn)證,為復(fù)雜曲面網(wǎng)格模型的直接數(shù)控加工提供了有效的理論依據(jù)。最后,進(jìn)行全文的總結(jié),并總結(jié)展望在復(fù)雜曲面網(wǎng)格模型的直接數(shù)控加工方法研究中存在和需進(jìn)一步解決的若干問(wèn)題。
[Abstract]:In recent years, with the rapid development of aerospace, automobile, molds and consumer products, complex surface parts have been more and more applied. Triangular mesh model can be used to express the appearance of surface parts. It has the advantages of rapid flexibility and strong topological adaptability. It is used in the manufacturing of timber, quality detection, redesign and remanufacture engineering, etc. The field of related technology has been widely used. Direct numerical control machining based on triangular mesh model can avoid the complicated operation of reverse surface model, error control and surface quality. It is an important way to realize rapid manufacturing. However, triangular mesh model is composed of mesh only, the NC code is generated, the machining accuracy and the addition are added. There are still problems in the work quality and other aspects, which need further research. In this paper, the tool path generation method in the triangular mesh model direct numerical control machining is studied. The tool path of the complex surface mesh model is proposed by the experimental processing and defect analysis of the triangular mesh model based on the CL path method. The new method is generated, including the vertex offset method of grid model, the algorithm for generating the tool locus of the discrete error compensation and the tool path generation algorithm of the bidirectional interpolation, developing the direct numerical control machining system of the complex surface mesh model, generating the tool track of the complex surface mesh model, and realizing the direct numerical control machining of the triangular mesh model. The main research contents of this paper include the following aspects: (1) in-depth investigation of the direct numerical control processing method of complex surface mesh model, understanding the current research status at home and abroad in this field, analyzing the CL path method of cutting tool path generation in the triangular mesh model, and pointing out the key technologies in the tool path generation of the current triangular mesh model. The research content and implementation plan of this paper are determined. (2) based on the format description of the model file, the influence of the quality of the grid model on the tool path generation is analyzed, and the topology reconstruction method of the model data is proposed, which provides the effective model data for the tool path generation of the grid model. The CL path method based on the grid model is implemented. The actual processing of two kinds of mesh models is used to analyze the surface quality of the machined parts. The problem of convex concave pits, concave grooves and regional triangulation defects on the surface of the mesh model is found, and the key technical problems of the current grid model CL path method are clearly defined. (3) the vertex offset method based on the boundary vertex is proposed. The boundary vertex normal vector correction algorithm and the vertex offset distance compensation algorithm based on the weighting error of the adjacent face offset error can effectively improve the bias effect of the triangular mesh model. The boundary vertex method is used to solve the cutting problem caused by the deviation of the boundary vertex normal vector. The vector correction calculation eliminates the actual machining problem in the boundary area. Based on the actual bias distance of the bias model, the analysis of the offset distance is not enough to cause the cutting problem, and the offset error is reduced by the offset distance compensation based on the weighted offset error of the adjacent face offset error. (4) the tool loci generation side of the bias model is studied. Method based on the discrete error compensation tool site generation algorithm based on the intersection of approximate curved surface contour curve, which avoids the precision problem of the knife site calculation caused by the triangular mesh model discretization error. On the basis of the selection of the cutter and the calculation of the residual height, the cross section intersection method is studied in detail. The relation between the surface and the position of the mesh surface, the calculation method of cross section intersection is given. The influence of the discrete error of the triangular mesh model on the calculation precision of cross section intersection is analyzed in detail. The mechanism of the defect on the surface of the part is studied by the grid model. The calculation precision of the knife site is improved by the discrete error compensation of the knife site. (5) the knife site knife is studied. With the path generation method and the interpolation algorithm of tool path, the tool path generation algorithm of bidirectional interpolation is proposed to realize the smooth processing of the tool path. The tool path generation and smoothing of the cutting plane direction are realized by using the three inhomogeneous B spline curve interpolation method. Through bidirectional interpolation of the knife site, the vertical to the cutting plane square is solved. Based on the geometric relationship between the tool path length and the approximation error, the interpolation method of the spline curve is analyzed. The interpolation point coordinates of the tool path are calculated by the method of equal parameter straight line approximation. (6) the direct numerical control of the complex surface mesh model is developed based on the tool path generation method based on the triangular mesh model. In this paper, a new method of tool path generation for complex surface mesh model is realized. The effectiveness of the new method of tool path generation is verified by the processing experiments and results of multiple example models, which provides an effective theoretical basis for the direct numerical control machining of the complex surface mesh model. Finally, A summary of the whole paper and a summary of some problems that need further solution in the study of direct NC machining methods for complex curved surface mesh models are given.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG659

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 林俊鋒;黃常標(biāo);祁楊停;;復(fù)雜三角網(wǎng)格模型分治加工刀具軌跡生成[J];計(jì)算機(jī)輔助設(shè)計(jì)與圖形學(xué)學(xué)報(bào);2015年02期

2 陳曉兵;廖文和;;復(fù)雜網(wǎng)格曲面高效加工數(shù)控編程策略研究與應(yīng)用[J];機(jī)械制造與自動(dòng)化;2012年06期

3 鐘國(guó)宇;高健;文豪;;面向三角網(wǎng)格模型數(shù)控加工的研究現(xiàn)狀分析[J];機(jī)床與液壓;2012年17期

4 胡津銘;楊旭靜;周元生;;三角形網(wǎng)格模型上刀觸點(diǎn)的加權(quán)補(bǔ)償法矢量計(jì)算方法[J];中國(guó)機(jī)械工程;2012年10期

5 孫殿柱;崔傳輝;康新才;王超;;基于散亂點(diǎn)云數(shù)據(jù)的五軸數(shù)控加工刀軌生成算法[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2012年05期

6 陳瑞華;;數(shù)控加工過(guò)程中進(jìn)給速率F的優(yōu)化方法[J];機(jī)械研究與應(yīng)用;2012年02期

7 孫全平;陳前亮;;一種基于STL模型的5軸高速加工刀軌優(yōu)化策略[J];工程圖學(xué)學(xué)報(bào);2011年05期

8 孫殿柱;崔傳輝;李延瑞;康新才;;三角網(wǎng)格模型多軸數(shù)控雕刻刀軌生成算法[J];江蘇大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年04期

9 劉建元;劉世能;;基于Z-Map留量模型的補(bǔ)加工研究[J];制造技術(shù)與機(jī)床;2011年02期

10 孫殿柱;李心成;李延瑞;劉健;;三角網(wǎng)格曲面高精度刀軌快速生成算法[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2010年07期

相關(guān)博士學(xué)位論文 前10條

1 谷明輝;三角網(wǎng)格表面模型的重建及處理相關(guān)技術(shù)研究[D];重慶大學(xué);2015年

2 郭保蘇;復(fù)雜網(wǎng)格曲面高效加工編程關(guān)鍵技術(shù)研究[D];南京航空航天大學(xué);2015年

3 陳岳坪;復(fù)雜曲面零件精密檢測(cè)與誤差補(bǔ)償技術(shù)研究[D];廣東工業(yè)大學(xué);2012年

4 徐寅;高質(zhì)量三角網(wǎng)格的生成及性質(zhì)研究[D];浙江大學(xué);2012年

5 陳曉兵;口腔修復(fù)體高效數(shù)控加工編程技術(shù)研究與實(shí)現(xiàn)[D];南京航空航天大學(xué);2011年

6 楊勝培;復(fù)雜曲面數(shù)控加工的若干基礎(chǔ)技術(shù)研究[D];湖南大學(xué);2009年

7 張頂學(xué);遺傳算法與粒子群算法的改進(jìn)及應(yīng)用[D];華中科技大學(xué);2007年

8 程筱勝;口腔修復(fù)曲面設(shè)計(jì)系統(tǒng)關(guān)鍵技術(shù)研究與實(shí)現(xiàn)[D];南京航空航天大學(xué);2007年

9 楊旭靜;自由曲面高性能數(shù)控加工刀具路徑技術(shù)研究[D];湖南大學(xué);2006年

10 趙向軍;網(wǎng)格曲面造型技術(shù)研究[D];浙江大學(xué);2006年

相關(guān)碩士學(xué)位論文 前10條

1 黃麗;基于STL模型的分層算法研究與軟件實(shí)現(xiàn)[D];山東農(nóng)業(yè)大學(xué);2016年

2 趙方;3D打印中基于STL文件的分層算法比較[D];大連理工大學(xué);2016年

3 蔡光輝;三角網(wǎng)格模型的等殘留高度刀具軌跡規(guī)劃及擬合[D];湘潭大學(xué);2015年

4 羅文煜;3D打印模型的數(shù)據(jù)轉(zhuǎn)換和切片后處理技術(shù)分析[D];南京師范大學(xué);2015年

5 李廣亞;機(jī)械零件快速成型的關(guān)鍵技術(shù)研究與開(kāi)發(fā)[D];濟(jì)南大學(xué);2014年

6 陳建;通用五軸數(shù)控加工仿真系統(tǒng)研發(fā)[D];西南交通大學(xué);2014年

7 王紅艷;三角網(wǎng)格曲面優(yōu)化展開(kāi)技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2013年

8 王小芳;面向數(shù)控加工的三角網(wǎng)格曲面刀具路徑設(shè)計(jì)方法研究[D];湖南大學(xué);2013年

9 趙秋艷;面向數(shù)控加工的三角網(wǎng)格法矢量與曲率計(jì)算方法研究[D];湖南大學(xué);2013年

10 林歡;基于逆向工程的空間曲面重構(gòu)及數(shù)控仿真[D];陜西科技大學(xué);2013年

，

本文編號(hào)：2040447