Abstract： Hand drawings and two dimensional （2D） CAD drawings have been replaced by three dimensional （3D） CAD models in mechanical design, but some 2D drawings produced before are needed in the new design. Howev...Abstract： Hand drawings and two dimensional （2D） CAD drawings have been replaced by three dimensional （3D） CAD models in mechanical design, but some 2D drawings produced before are needed in the new design. However, the techniques and software packages for automatically converting 2D drawings into 3D-CAD models with high precision have not yet been developed due to the difficulties to verify the validity of the drawings, to decide the hidden lines and eoncavo-convex faces, and to represent free-form surfaces. In addition, it is very time consuming to manually convert a large number of 2D drawings into 3D CAD models. To address these problems, we propose an approach for converting 2D drawings into 3D-CAD models automatically.展开更多
提出了一种基于CAD零件离散体素模型的异质材料建模方法,重点对多材料模型和功能梯度材料模型建模进行阐述,提出固定参考特征活动梯度源(Fixed reference features ＆ active gradient sources,FRF＆AGs)的概念,引入复合AGS和不同方向FR...提出了一种基于CAD零件离散体素模型的异质材料建模方法,重点对多材料模型和功能梯度材料模型建模进行阐述,提出固定参考特征活动梯度源(Fixed reference features ＆ active gradient sources,FRF＆AGs)的概念,引入复合AGS和不同方向FRF的建模算子,提高异质材料/零件建模的效率和灵活性。并将传统CAD实体建模的交、并、差等布尔算子扩展到异质材料零件的建模中。最后给出了设计实例。展开更多
An algorithm for compensating the varying section contour within the extent of each layer thickness is proposed to improve the rapid prototyping part’s shape and size precision.
文摘Abstract： Hand drawings and two dimensional （2D） CAD drawings have been replaced by three dimensional （3D） CAD models in mechanical design, but some 2D drawings produced before are needed in the new design. However, the techniques and software packages for automatically converting 2D drawings into 3D-CAD models with high precision have not yet been developed due to the difficulties to verify the validity of the drawings, to decide the hidden lines and eoncavo-convex faces, and to represent free-form surfaces. In addition, it is very time consuming to manually convert a large number of 2D drawings into 3D CAD models. To address these problems, we propose an approach for converting 2D drawings into 3D-CAD models automatically.
文摘提出了一种基于CAD零件离散体素模型的异质材料建模方法,重点对多材料模型和功能梯度材料模型建模进行阐述,提出固定参考特征活动梯度源(Fixed reference features ＆ active gradient sources,FRF＆AGs)的概念,引入复合AGS和不同方向FRF的建模算子,提高异质材料/零件建模的效率和灵活性。并将传统CAD实体建模的交、并、差等布尔算子扩展到异质材料零件的建模中。最后给出了设计实例。
基金Supported by College Science Foundation of Jiangsu(07KJB460113)
文摘An algorithm for compensating the varying section contour within the extent of each layer thickness is proposed to improve the rapid prototyping part’s shape and size precision.
