Research On Cooling System Optimization And Lightweight Of Precision Injection Mould

The molding efficiency and quality of plastic parts will directly affect the benefit of enterprises.Because of the constant distance between the cooling water channel and the core wall,it is favored by people.However,the shortcomings of long manufacturing cycle and high cost limit the development of the molding water channel.Low cost,fast and economical mold making has always been the goal of enterprises.Based on this,this paper studies the cooling system optimization and lightweight of precision injection mold,in order to improve the molding efficiency and molding quality of plastic parts,reduce the mold manufacturing cost and molding cycle.This paper firstly studied the heat transfer mechanism of injection mold,obtained the calculation model of cooling time,explored the factors affecting cooling time,and completed the design of the runway section cooling channel structure.Then,based on the response surface method,the diameter of the channel,the distance between adjacent channels and the distance between the channel and the cavity wall were taken as the design variables.The Box-Behnken experiment with three factors and three levels was established.Taking the cooling time and warp deformation as the optimization objectives,NSGA-II genetic algorithm was used to carry out the multi-objective optimization of the mold cooling system,and the Pareto optimal solution was obtained.Then,lightweight design was carried out on the injection mold optimized with the cooling system,mechanical properties of different lattice structures were analyzed,and the mechanical properties of pyramid lattice structure were obtained as the best.Lattice optimization was carried out on the mold core,optimization area and optimization target were set,and the lattice structure density cloud map was obtained.The lattice lightweight design of the mold core structure was carried out.The results showed that the maximum deformation of the mold increased by 27.79%,the maximum stress increased by 20.57%,but the mold quality decreased by 21.89%.Finally,based on the above research,an integrated optimization design method of precision injection mold based on response surface method,genetic algorithm and lattice lightweight was proposed.Taking the mold core of Bluetooth headphone inner cover as an example,the form-following cooling channel structure was designed and the lattice structure lightweight design was completed.The SLM printing process was simulated to obtain the optimal printing process parameters of the parts.The part is manufactured by SLM printing.The practice has proved that the integrated optimization method has high design efficiency and low mold cost.