Design of injection mould for car handle based on gas-assisted molding
To ensure the reliability of the injection molding structure and quality of a certain car handle,CAE injection molding simulation was conducted based on Moldflow,and gas-assisted flash molding method was determined as the mould design and injection molding scheme.CAE simulation results show that total effect deformation of the plastic parts is reduced by 31.3%compared to the gas-assisted standard forming method.Requirement for the accuracy of the filling melt volume is relatively low and easier to control.Gas-core penetration effect is good,and the most suitable gate position,optimal injection process parameters,as well as the optimal inlet position,gas delay time,gas injection time,gas pressure,and gas holding time for gas assisted forming are obtained.According to the molding plan,a targeted design was made for the pneumatic injection needle movement mechanism driven by the oil cylinder,the material channel closure movement mechanism,and the flash groove.Based on the structural charac-teristics of plastic products,the angle pin is used to drive the sliding block mechanism to drive the double-sided inclined wedge block to move,thereby driving a pair of sliding block inserts to move towards each other,solving the problem of core pulling and demolding of umbrella shaped tooth surfaces and countersunk holes in limited space.An angle pin driven slider core pulling mecha-nism was designed to achieve lateral core pulling with features such as ribs and tapered holes on the shaft.To ensure the safe,accu-rate and reliable operation of gas-assisted molding,plastic part ejection and other actions according to the optimized injection molding process,corresponding sequence control and guarantee mechanisms have been designed for each motion mechanism.After injection molding production verification,the mold control and debugging are simple and convenient,the operation is safe,accurate and reliable,the quality of plastic parts is stable,and it meets the design requirements.
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