| The temperature field and stress field of die casting mould have the importantinfluence to improve product quality, production efficiency and die casting die life.Especially for large and complex die casting mould, better mould temperature field andstress field is very important.In this paper, structural characters of large&complicate Al alloy power part wasanalyzed. Then gating system and venting were designed for die casting process andoptimized through numerical simulation. Furthermore, die casting mould was designedand fabricated.The mould temperature field was calculated by numerical simulation according todie casting procedure. The effect of pouring temperature, preheated mould temperature,the temperature and the velocity of cooling water on mould temperature field wereinvestigated. The results showed as followings:(1) The highest temperature and temperature gradient of the mould can be reduced bythe lower pouring temperature.(2) The cycles required to achieve thermal equilibrium for the mould can bedecreased by the higher preheated mould temperature.(3) The temperature of cooling water has little impact on the mould temperatureunder the experimental temperature range.(4) Mould temperature decreased rapidly under the faster velocity of the coolingwater, and the temperature gradient of the mould can be reduced too. That is to say, themould temperature field will be more reasonable.Therefore, The optimization of process parameters are pouring temperature923K,preheated mould temperature523K, cooling water temperature at303K, cooling waterflow velocity4m/s. The mould stress field was investigated based on the analysis of the abovetemperature field, and the stress variation curve and strain curve are drawn. The resultsdemonstrated that the distortion of the mould is about0.023mm，predicted mould life canbe up to100000cycles.Mass production showed that simulated temperature field and stress field can be metwith the actual test, and the above results are valid. |
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