模具热处理并行设计英文文献和中文翻译(3)
The database is the foundation of making out heat treatment process. Generally, heat treatment database is pided into materials database and process database. It is an inexorable trend to predict the property by materials and process. Although it is difficult to establish a property database, it is nec- essary to establish the database by a series of tests. The materials database includes steel grades, chemi- cal compositions, properties and home and abroad grades parallel tables. The process database includes heat treatment criterions , classes, heat preservation time and cooling velocity. Based on the database, heat treatment process can be created by inferring from rules. 2.4 Tool and equipment for heat treatment After heat treatment process is determined, tool and equipment CAD/CAE system transfers the information about design and manufacture to the numerical control device. Through rapid tooling prototype, the reliability of tool and the clamping apparatus can be judged. The whole procedure is transferred by network, in which there is no man-madinterference. 3 Key Technique 3.1 Coupling of temperature, microstructure, stress and property Heat treatment procedure is a procedure of temperature-microstructure-stress interaction. The threfactors can all influence the property (see Fig. 4).During heating and cooling, hot stress and transfor-mation will come into being when microstructurechanges. Transformation temperature-microstructure and temperature-microstructure-and stress- property interact on each other. Research on the interaction of the four factors has been greatly developed, but the universal mathematic model has nobeen built. Many models fit the test nicely, but thecannot be put into practice. Difficulties with most omodels are solved in analytic solution, and numericamethod is employed so that the inaccuracy of calculation exists. Even so, comparing experience method with quali tative analysis, heat treatment simulation by com- puter makes great progress. 3.2 The development procedure for die and mould involves design, manufacture, heat treatment, as- sembly, maintenance and so on. They should have own database and model. They are in series with each other by the entity-relation model"'. Through establishing and employing dynamic inference mech- anism, the aim of optimizing design can be achieved. The relation between product model and other mod- els was built. The product model will change in case the cell model changes. In fact, it belongs to the re- lation of data with die and mould. After heat treat- ment model is integrated into the system, it is no more an isolated unit but a member which is close to other models in the system. After searching, calcu- lating and reasoning from the heat treatment data- base, procedure for heat treatment, which is re- stricted by geometric model, manufacture model for die and mould and by cost and property, is ob- tained. If the restriction is disobeyed, the system will send out the interpretative warning. All design cells are connected by communication network. Establishment and integration of models 3.3 Management and harmony among members The complexity of die and mould requires close- ly cooperating among item groups. Because each member is short of global consideration for die and mould development, they need to be managed and harmonized. Firstly, each item group should define its own control condition and resource requested, and learn of the request of up-and-down working procedure in order to avoid conflict. Secondly, de- velopment plan should be made out and monitor mechanism should be established. The obstruction can be duly excluded in case the development is hin- dered. [3]
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