沖壓模具畢業(yè)設(shè)計(jì)外文翻譯--模具熱處理及其導(dǎo)向平行設(shè)計(jì)-模具設(shè)計(jì)-展示頁
2025-05-27 15:43本頁面
【正文】 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 transformation kiics ， phase stress,thermal stress， heat transfer， hydrokiics etc． For example， 3D heat— conducting algorithm models for local heating plicated impression and asymmetric die and mould， and M ARC software models for microstructure 4 transformation was used ． Computer can present the informations of temperature， microstructure and stress at arbitrary ti me and display the entire transformation procedure in the form of 3D by coupling temperature field,microstructure field and stress field ． If the property can be coupled,various partial properties can be predicted by puter． Heat treatment process des ign Due to the special requests for strength， hardness， surface roughness and distortion during heat treatment for die and mould， the parameters including quenching medium type， quenching temperature and tempering temperature and time， must be properly selected， and w hether using surface quenching or chemical heat treatment the parameters must be rightly determined． It is difficult to deter mine the parameters by puter fully． Since puter technology develops quickly in recent decades, the difficulty with large— scale calculation has been overe． By simulating and weighing the property， the cost and the required period after heat treat ment． it is not difficult to optimize the heat treatment process． Data base for heat treatment A heat treatment database is described in Fig． 3． The database is the foundation of making out heat treatment process ． Generally， heat treatment database is divided 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 necessary to establish the database by a series o f tests ． The materials database includes steel grades,chemical positions， 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． 5 Tool and equipment for heat treatment After heat treatment process is deter mined， 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 appara tus can be j udged． The whole procedure is transferred by work， in which there is no man— made interference． 3 Key Technique Coupling of temperature， microstructure， stress and property Heat treatment procedure is a procedure of temperaturemicrostructure—stress interaction． The three factors can all infl uence the property (see Fig． 4)． During heating and cooling， hot stress and transfor mation will e into being w hen microstructure temperaturemicrostructure and temperature— microstructure— and stressproperty intera ct on each other ． Research on the interaction of the four factors has been greatly developed,but the universal mathematic model has not been built． Ma
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1