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| Geometric reverse resolution and model reconstruction of excavator dipper teeth based on feature extraction |
| WANG Chun-Xiang, LI Le, WANG Jian-Guo |
| School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China |
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Abstract To develop a new composite material excavator dipper teeth, which matches the holder of excavators in service on worksites, all design data of old tooth should be available. The excavator dipper tooth is a functional component with irregular shape, fitting constraints in inner cavity, and complex figure. It is extremely time-consuming to measure the size of teeth through general instruments, meanwhile the measuring accuracy can not be guaranteed, and especially its inner cavity and pinhole position was even harder to measure. So the material object reverse engineering technique was used to obtain the sizes and 3D model of the tooth exactly. The methods for extracting feature curves needed in the following tooth modeling from measured 3D coordinate points of the tooth were proposed, including the tooth 3D modeling based on extracted curves. The procedures and key links during feature extracting using Imageware and solid modeling based on those curves in Pro/E were also presented. First-trial-production dipper teeth according to the drawing generated from reconstructed CAD model can match with its holder and work well on the worksite, it indicates that the model reconstruction method mentioned above is effective and practical.
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Published: 28 June 2010
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基于提取特征的挖掘机斗齿的几何反求和模型重建
为了研制可以和现场机型斗齿座配套的挖掘机新型复合材料斗齿,首先需知斗齿结构的全部设计数据.斗齿是一种外形不规则、内腔有配合要求的形状复杂的功能零件，要获取其全部结构尺寸参数,使用一般的测量器具极其费时,测量精度也无法保证，尤其是对精度要求相对最高的斗齿内腔形状和销孔位置等部分参数更是难以检测.为此,采用实物反求工程的技术路线,研究了斗齿结构参数的获取方法.针对实测到的斗齿点云数据,提出以实体模型的建立为目的首先提取关键形状的特征线,再将提取结果用于三维模型的重建.介绍了借助Imageware软件完成特征线提取以及Pro/E软件创建实体模型的策略和步骤.按反求CAD模型生成的工程图样试制的斗齿,经过了现场试用,结果表明包括斗齿内腔表面和销孔位置等重要参数在内的尺寸和形状反求精度符合要求,说明了所采用的技术路线可行、有效.
关键词：
斗齿,
逆向工程,
特征提取,
参数化建模
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