Injection Mold Two-dimensional Temperature Field In The Boundary Element Analysis

The cavity temperature of injection mold and its uniformity affect significantly productivity and the quality of the final molded part .Although the temperature of injection mold is effected by many factors,control and adjustment basically depend on the cooling system.Given the design parameters,it is importance to predict the temperature and temperature difference distribution of the cavity and the core and the cooling time which provide essential foundation for designer to evaluate scheme and to optimize cooling system design.The objective of this thesis is to develop a numerical analysis method for 2D static and transient temperature field of injection mold.The folloeing works have been finished:1. According to the cycle-averaged theory, a boundary integral formulation is established to analyse the typical-section temperature profile of injection mold;In view of configuration of injection mold (the cavity is slit),a numerial method has been presented for solving boundary integral equation analyzing temperature field.Heat transfer analysis is applied to mobile plate and solid plate,respectively,and coupling and iteration is implemented between the mold and part until the temperature and the heat flux of the interfacial surface (the cavity surface and the parting surface) meets special compatibility conditions.As a result,the cavity temperature d stribution is obtained.2. Abased on a hypothesis that transient-state temperature is equal to superimpose a fluctuation on steady-state one,the transient heat conduction equation of ID analyzing temperature fluctuation is established.A method for solving temperature fluctuation on the cavity surface is given through the finite difference combining with heat transfer theory and a numerial method is presented for calculating transient-sate temperature field.3. An efficient numerical simulation has been developed for predicting 2D temperature p-ofile of injection mold.Using two illustrative examples, variation of mold cavity surface static temperature and transientfluctuation versus time is discussed.In addition, the factors influencing mold cavity temperature are analyzed by the means of processing conditions and cooling channels changing.