关键词: 吹制成型, 玻璃成型, 数值模拟, 热耦合

Abstract: The contact time of glass melt and mold is very short in glass blow forming process in which there is a rapid and intensive heat exchange,and the temperature of contact surface changes significantly.Glass viscosity governing glass flow during the forming process is strongly dependent on temperature.A small temperature variation in glass melt may produce a great change in its viscosity,which further affects the distribution of final product thickness.Therefore a coupling simulation of melt and mold heat transfer is crucial.An interface element was developed to deal with heat transfer between glass melt and mold in the glass forming process.The governing equations of melt flow and heat transfer based on the principles of conservation of mass,momentum and energy were expressed in the Lagrangian method.The finite element formulations to solve velocity,pressure and temperature were derived by means of the Galerkin method,and the corresponding program with VC++ was developed.Temperature distributions were calculated from both coupling and iteration methods.The coupling method could give very good result,but the iteration method could not meet the accuracy requirement.The temperature in most parts of the mold kept stable during continuous production except for the area close to contact surface where temperature had high periodic changes.The simulation result was compared with the real industry product.The prediction of thickness distribution was consistent with the real part.The accuracy was more than 88%.

Key words: blow processing, glass forming, numerical simulation, coupling heat transfer