In this way, the direction of the tangent vector of the intersecting line on the curved surface and the tangent vector of the expansion curve on the expansion plane are the same, that is, the direction cosine value is the same. After deriving the parametric equation, the tangent unit vector of the intersecting line can be obtained, and the vector component is the direction cosine value of the tangent unit vector.įor the intersecting line on the deployable surface, the unfolding curve on the unfolding plane can be considered as the mark left by the unfolding blue surface on the unfolding plane after pure rolling on the unfolding plane. By projecting to the coordinate surface, after eliminating the coordinate parameters, the intersection line is obtained. It is to transform all the surface equations that intersect with the surface to be developed into the coordinate system on the surface to be developed. Analytical algorithm has always been a subject of research. When drawing the unfolding diagram, the intersecting lines on the curved surface must be calculated to obtain the unfolding curve on the unfolding plane. The visualization and parametric drawing system of sheet metal parts developed in this paper can not only shorten the production cycle, save human resources, improve productivity and drawing accuracy, but also analyze the graphics of the unfolded drawings that change with the size of the sheet metal parts. With the development of computer technology, computer drawing technology is advancing by leaps and bounds, it is necessary to use computer to draw unfolded drawings of sheet metal parts. In actual production, the traditional drawing method of unfolded sheet metal parts is time-consuming and labor-intensive, and the accuracy is low.
#Error loading dialog control file autocad r14 windows
Based on AutoCAD R14, using Auto LISP & DCL language to develop a visualization and parametric drawing system for unfolded sheet metal parts running on Windows 95, 98/NT operating system. Abstract: This paper introduces the numerical algorithm of the unfolded drawing of sheet metal parts.