【摘要】：隨著技術的進步,機械零件中出現(xiàn)了大量的有著表面形狀復雜,外形呈自由曲面的零件。一旦這些零件因磨損、斷裂、腐蝕等原因失效,整個機器將不可避免徹底失去其使用功能。傳統(tǒng)的零件維修方法在修復這些失效零件,要么修復過程繁瑣、復雜,要么無法修復。這造成了巨大的浪費。為了精確地、方便地修復這些形狀復雜、有著自由曲面特征的零件,本文嘗試了引入逆向工程技術中的表面數據采集技術,結合快速成型技術對這些失效零件進行修復,為復雜表面的失效零件提供了一種新的修復手段。 本文的研究包括以下幾個方面： 1)逆向工程輔助的零件修復技術的總體方案設計,研究了使用于使用本方法進行修復的零件失效形式,逆向工程數字化采集方法的選擇,以及零件缺損部位數字模型的獲得和快速成型修復的總體流程。 2)研究了分析了失效零件表面數據采集與一般逆向工程數據采集之間的不同之處,提出了針對以修復零件為目的的失效零件表面數據采集的方法。 3)通過將失效零件表面數據與原始CAD模型作對比,得到零件缺損部位的數字化模型。在具體比較方法上,本文提出了點云比較法和實體比較法兩種獲得缺損部位的數字化模型的方法。 4)提出了使用快速成型技術,對零件進行修復的技術。本文研究了根據零件材質的不同,選擇不同類型的快速成型方法進行修復。根據各種快速成型方法的技術特點,將失效零件的修復方法分為直接修復法和間接修復法兩類。 論文最后,通過兩個失效零件的實例數據采集與快速成型修復,驗證了將逆向工程技術與快速成型手段相結合,修復復雜表面零件的可行性與實際運用價值。
[Abstract]:With the development of technology, there are a lot of parts with complicated surface shape and free-form surface. Once these parts fail due to wear, fracture, corrosion and so on, the whole machine will inevitably lose its function completely. The traditional method of repairing these invalid parts is either complicated, complicated or impossible to repair. This caused a great waste. In order to accurately and conveniently repair these parts with complex shapes and free-form surface features, this paper attempts to introduce the surface data acquisition technology in reverse engineering technology, combining with rapid prototyping technology to repair the failure parts. It provides a new repair method for the failure parts of complex surface. The research of this paper includes the following aspects: 1) the overall scheme design of the reverse engineering aided part repair technology, the research of the failure form of the parts used in the repair using this method, and the selection of the digital acquisition method of reverse engineering. As well as the part defect location digital model and rapid prototyping repair of the overall process. 2) the difference between surface data acquisition and general reverse engineering data acquisition is analyzed, and the method of surface data acquisition for repairing parts is put forward. 3) by comparing the surface data of the defective parts with the original CAD model, the digital model of the defective parts is obtained. In this paper, point cloud comparison method and solid comparison method are proposed to obtain the digital model of the defect. 4) using rapid prototyping technology to repair parts. In this paper, different types of rapid prototyping methods are chosen to repair parts according to their different materials. According to the technical characteristics of various rapid prototyping methods, the repairing methods of failure parts are divided into direct repair method and indirect repair method. Finally, the feasibility and practical application value of repairing complex surface parts by combining reverse engineering with rapid prototyping are verified by data collection and rapid prototyping repair of two invalid parts.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH13;TP391.72

【引證文獻】

相關碩士學位論文 前1條

1 張軍強;數字化模型獲取技術在模具修復中的應用[D];南昌大學;2012年

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本文編號：2427291