Multi-objective optimize gas-assisted time parameters with CCD response surface method
Compared to traditional plastic injection molding,delay time and gas injection time are unique parameters for gas-assisted molding,which increases the complexity of gas-assisted molding.In order to accurately design the values of delay time and injection time,and achieve ideal gas penetration effect and gas finger amplitude,the plastic part with typical gas-assisted structures were taken as research object.Firstly,the effects of delay time and gas injection time on the quality of gas-assisted molding were studied by gas-assisted molding full three-dimensional CAE.The results show that properly increasing the delay time can reduce or eliminate the gas finger defects and improve the penetration length,but too long delay time will lead to"short shot",and too short delay time will lead to serious gas finger defects.Increasing the gas injection time can improve the gas penetration effect,reduce surface defects,and reduce internal stress and warping deformation.However,if the gas injection time is too long,the high-pressure nitrogen part inside the gas finger will tear it to form serious gas finger defects,and even cause the plastic part to expand and become scrapped.Then,the CCD response surface method was used for multi-objective optimization,and the optimal values of delay time and gas injection time were obtained as 4 s and 10.37 s,respectively.The optimized values are verified through CAE and experi-ments,and the gas penetration effect and gas assisted molding quality under the optimized values are good,which improves the quality and efficiency of gas-assisted molding and can be used for actual production of gas-assisted molding.
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