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Based product data management and producing three-dimensional parametric modeling of the mold CAD system

Processed to generate the size of realistic dimensions of the parts. Therefore,[link widoczny dla zalogowanych], the establishment of standard mold and semi-parametric library of standard parts at the same time building their part models and associated parameter file. The size of drive is based on the basic characteristics of the body size index and the value of automatic annotation and processing of knowledge based on cut off the feet, so that this method of variable parameters of components specifically designed without reference to specific parts Bianzhi change the design process, the parameter Gallery completely open to users, allows the user to model the part of the Gallery additions and deletions and modifications. In the design of the mold, when calculated to determine the perimeter of the die, in accordance with the typical combination, you can determine the parameters of die most of the components of a file in the parametric values. And to determine the specific size of these parts. 【C) 【d) Figure 3 after the seat back pillar die ring assembly modeling process generates 3.2 mold assembly structure as typical, it can determine the model structure used as the location of parts and components assembly file to achieve the pull-assembly relationships extension module assembly drawing generation. Determine the location from the perspective of the assembly. In addition to geometric information for each part and process information, but also to define the assembly information,[link widoczny dla zalogowanych], for a part,[link widoczny dla zalogowanych], its assembly information a mounting surface of the anchor point and the initial position. Mounting surface than the initial position is defined as the physical anchor point, but it is the space vector,[link widoczny dla zalogowanych], pointing to the most commonly used according to its orientation has + a, + y, a y, + z, a Z6 one, as shown in Figure 3c . Set on the upper surface of the mold base for the mounting surface, the initial position is the + z, part of a mounting surface of the initial orientation is fixed by the agreement. Anchor mounting surface is generally symmetrical center or centroid, when a part parameters caused by structural changes in the size of size changes, such as the definition of the anchor position unchanged, the relevant body parts are on the point and the relative change. Each part in the assembly, the main point is to determine the installation of surface orientation in the assembly drawing of the three-dimensional coordinate position and orientation parts of the installation, if the initial orientation and installation of different directions,[link widoczny dla zalogowanych], it will be rotating parts <Mould Industry . No. 2 Total 2049 change, so that part of the initial orientation and then to participate in the same position with the installation of assembly. According to the structural characteristics of the mold, for each typical mold assembly to define a relationship between the corresponding documents, when the selection of a typical combination, transfer the library from the mold assembly between the corresponding documents, between documents by automating the assembly, automatic will form part of the mediator to the specified location, generate three-dimensional mold assembly drawings, the assembly elected in Table 1 Optional file format between the projection direction and the cutting location to automatically generate two-dimensional projection. Mold base completely open to the user, the user need to increase the typical mold, simply add to the mold base assembly between the corresponding file. Users can easily use any text editor to modify files on the assembly relationship. Assembly relation file format shown in Table 1, which contains all the assembly parts, assembly of parts is called when the graphics file name, part of the anchor assembly and installation position. Locate the coordinates of the general form of an expression, the value of the variable expression constitute part by the values of variables to determine the relevant parameters. When generating assembly drawings. First of all the constituent parts through the parameters of the relevant documents parametric values of the search, calculate and determine the specific coordinates of anchor points, followed by the assembly of parts between the three-dimensional document graphic insert to the specified anchor point to generate assembly drawing. The system also provides interactive tools for users based on the actual situation on the assembly drawing of the relevant zero position. 4 Conclusion CAD system used in the development of product data management techniques and parametric feature modeling CAD in recent years one of the main trends of technological development, to apply them to die CAD system developed to effectively improve the system design efficiency. Enhance the adaptability of the system. References 1 Zhang Zigong and so on. Improve the efficiency and flexible mold structure CAD effective way. Tooling industry. 1996, (5) 2 Gao Shuming, PENG Qun. A model for the parameters of special design Xie. Computers, 1996.4.3 Beijing flexible integrated manufacturing of advanced technology consulting center. Collected Works of product data management technology. 1997.1.4 Li Jianming and so on. Product data management (PDM) and the concurrent design support environment. Computer Integrated Manufacturing Systems, 1996.9. Bovine arsenic Series 5, left foot j Mak drugs, sale of red. . Pieces of any size and an agreed outline of proposed die design process, often use the pieces face Received: June 1997 to 12 orders and product and hit the center of gravity calculation, for some complex shape and irregular outline of an area of only use of approximate calculation. Against the center of gravity calculations are hanging by the traditional line method, both complicated and a waste of time, the results highly inaccurate. With the computer of a bamboo CAD Yi 2

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