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The concurrent pattern differs ultimately from the serial pattern (see Fig. 1). With regard to serial pattern, the designers mostly consider the structure and function of die and mould, yet hardly consider the consequent process, so that the former mistakes are easily spread backwards. Meanwhile, the design department rarely communicates with the assemb- ling, cost accounting and sales departments. These with purchasers. This is propitious to elimination of the conflicts between departments, increase the effi- ciency and reduce the cost. Heat treatment process in the concurrent cir- cumstance is made out not after blueprint and work- piece taken but during die and mould designing. In this way, it is favorable to optimizing the heat treat- ment process and making full use of the potential of problems certainly will influence the development the materials. 2 Integration of Heat Treatment CAD/CAE for Die and Mould It can be seen from Fig. 2 that the process de- sign and simulation of heat treatment are the core of integration frame. After information input via prod- uct design module and heat treatment process gener- ated via heat treatment CAD and heat treatment CAE module will automatically pide the mesh for parts drawing, simulation temperature field micro- structure analysis after heat-treatment and the de- fect of possible emerging (such as overheat, over- burning), and then the heat treatment process is judged if the optimization is made according to the result reappeared by stereoscopic vision technology. Moreover tool and clamping apparatus CAD and CAM are integrated into this system. The concurrent engineering based integration frame can share information with other branch. That makes for optimizing the heat treatment process and ensuring the process sound. 2. 1 3-D model and stereoscopic vision technology for heat treatment The problems about materials, structure and size for die and mould can be discovered as soon as possible by 3-D model for heat treatment based on the shape of die and mould. Modeling heating condi- tion and phase transformation condition for die and mould during heat treatment are workable, because it has been broken through for the calculation of phase transformation thermodynamics, phase trans- formation kinetics, phase stress, thermal stress, heat transfer, hydrokinetics etc. For example, 3-D heat-conducting algorithm models for equiflux/local heating complicated impression and asymmetric die and mould, and MARC software models for micro- structure transformation was used. Computer can present the informations of temperature, micro- structure and stress at arbitrary time and display the entire transformation procedure in the form of 3-D by coupling temperature field, microstructure field and stress field. If the property can be coupled, various partial properties can be predicted by computer. 2. 2 Due to the special requests for strength, hard- ness, surface roughness and distortion during heat treatment for die and mould, the parameters inclu- ding quenching medium type, quenching tempera- ture and tempering temperature and time, must be properly selected, and whether using surface quenching or chemical heat treatment the parameters must be rightly determined. It is difficult to deter- Heat treatment process design mine the parameters by computer fully. Since com- puter technology develops quickly in recent decades, the difficulty with large-scale calculation has been o- vercome. By simulating and weighing the property, the cost and the required period after heat treat- ment, it is not difficult to optimize the heat treat- ment process. 2.3 Data base for heat treatment A heat treatment database is described in Fig. 3.