Computer-aided Tolerance Analysis And Design Calculations

In the modern product designing, the computer-aided designing (CAD) technology has developed to mature. As the key technology of controlling accuracy and reliability of product - Computer-Aided Tolerancing(CAT), however, is still in the im'tial stage of developing from manual work to computer-aided work, which has caused its current status quo could not be compatible with CAD/CAM and CIMS' development. Especially in the military system, designing automatic weapons and producing models all need dimension-chain calculating document. How to use computer to calculate the dimension-chain conveniently, fast and exactly, and to make the dimension-chain calculating document is the important issue of improving automatic weapons' research capabilities and shortening their development cycle .This paper aims at the key issues of dimension-chain calculation, according to the study on the basic knowledge of dimension-chain, we have developed the dimension-chain calculating software framework which was built on Visual Studio 2005. Also we have taken research on the technology of developing the UG system secondarily to generate dimension-chain data with man-machine interaction, and given the method of data exchanging with UG. We have taken research and developed the technology of using VC++ to call on the professional Matlab computing software to complete the calculation. We have given the detailed method of the database of tolerance inquiry, and formed the functional module which can meet the software's requirements and is simple for operating. We have taken deeply research on the key modules of the software, and preliminarily realized some modules which provided the foundation for the next step in improving the software. We have developed some auxiliary modules of the dimension-chain calculating software. Especially we have developed the function of commonly looking about the CAD drawings and the function of making dimension-chain calculating document so that users could check dimension-chain more conveniently. And the functions also can solve the heavy work in the making of dimension-chain calculating document.