The Research And Implementation Of Engineer Drawing Key Technology Based On The 3D CAD Platform

With the development of CAD technology and the demand of engineering applications, more and more domestic enterprises have begun using the foreign mature 3D CAD system for product and engineering design. But these CAD system are all universal platform, they haven't provide the 2D engineering drawing functions which met the national standard, so it's necessary to integrate these functions to facilitate the demand of domestic enterprises. This paper was based on the demand of CISDI's 3D CAD system's 2D engineering, against the national standards and enterprise criterion, then researched and developed the 3D CAD system's 2D engineering's national standard drawing and document management functions.First, this paper researched the customization methods of 3D CAD platform's engineering drawing file templates, and then achieved the template's customization which met the enterprise criterion; with the research of 3D assemble partslist object, achieved the auto generation and distilling of the partslist; with the research of engineering drawing text, achieved the technology label's import and export; with the controlling of national standards and enterprise criterion, achieved the engineering drawing's tolerance modification function.For engineering drawing's balloon, the existing 3D CAD system are all think about the balloon functions only from the point of program design, the balloon can't be created by the engineering drawing standard. For the simple and complex balloon sort condition, this paper proposes the corresponding auto sorting algrithom. For balloon layout problem, uses the inclusive box technology, abstracts the balloon layout's math model, and then proposes an auto layout algorithm.Aimed at the demand of 3D CAD system's engineering drawing document management, researched and implemented the batch print and batch convertion function; through the deeply analysing and researching, implemented the drawing sheets content's auto generation. To satisfy the demanding of the different people in enterprise, used the 3D CAD platform's file index database, implemented the B/S model's drawing file browser function.Through the Inventor's Automation Interface and the C++ program language, developed the engineering drawing model and document manage model which met the national engineering drawing standard and enterprise criterion. This paper's research and development enhanced 3D CAD system's auto design level, facilitated users to drawing GB engineering drawing paper, and reduced the time of drawing paper.