Computer-aided Precision Design Technology

In modern mechanical product design, precision design is the important component parts of a complete mechanical design. Precision design has an important influence on the quality and performance of products, it is also plaph a vital role of the product cost. The computer aided design is in a highly developed time, but it is still in the primary stage. This situation is can not adapt to developing CAD\CAM. Supporting the computing instruction of dimensional chain is necessary in the design and production of pipeline equipment. It is also necessary in the design of metallurgical industry. It is an important question of making the best use of mechanical precision design in computer software. If we want improve the ability of metallurgical machinery research and short the development cycle, we must resolve the question.This paper discusses the scheme of precision design with computer. It studies the key technologies of the automatically about dimensional chain, it developed the sphtem which is based on AutoCAD and Visual Studio 2005 platform. This paper which mainly contents the studies is about:1 In scholars both at home and abroad on the basis of research achievements, study met the modern manufacturing quality and product quality control sphtem of science of computer aided precision design sphtem model2 Studied dimension chain automatically generate techniques, including dimension chain each ring auto-generated, main calculation method and other related content. In China's metallurgical equipment extensive design production, for example, deeply discuss the latest mechanical precision design, testing and guarantee method and quality control technology.3 To tolerances query database detail design project, and become can satisfy the software requirements, simple operation flexible function modules.4 In-depth study discuss some of the tolerance design calculation software critical modules such as geometrical tolerance module, introduces the development tools, using VB to establish geometrical tolerance ACCESS database, realizing the geometrical tolerance of automatic query. With AutoCAD software, support for graphics in AutoCAD phphical. Developed can preliminarily use of modules, for software development nearly step perfect to lay the foundation. Development after completing the software can be in CAD drawing automatically formed menu bar and automatically finished query, mark function. The user more convenient complete precision design.