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将各种不同气道截面等效于圆形,引入形状因子来衡量它们偏离圆形的程度。利用moldflow软件对气体在不同构型气道内的穿透过程进行了数值模拟。结果表明:形状因子越大则气体穿透深度越大,对气体辅助注射成型有利。但由于形状因子越大则气道截面偏离圆形越远,不利于形成均匀的熔体壁厚,因此在设计气道截面时,应合理选择形状因子以便获得恰当的气体穿透深度和熔体壁厚。最后还给出了气道设计的一般原则。
The various airway cross-sections are equivalent to circles, and the shape factor is introduced to measure the extent to which they deviate from the circle. The moldflow software was used to simulate the gas penetration process in different configurations of airway. The results show that the larger the shape factor is, the larger the gas penetration depth is, which is beneficial to gas-assisted injection molding. However, the larger the form factor, the farther the airway cross-section deviates from the circle, which is not conducive to the formation of uniform melt wall thickness. Therefore, in the design of air-duct cross-section, the shape factor should be selected reasonably in order to obtain proper gas penetration depth and melt Wall thickness. Finally, the general principles of airway design are also given.