摘要
Abstract
Due to the thermal insulation,cushioning and shock resistance of the inner liner,the EPS material and the two step impregnation process are adopted.After pre-foaming,the expandable polystyrene beads were then put into the double wall foam mould in steam chamber and foaming.Foaming mould is the key equipment to form helmet liner.Though the shape analysis of helmet liner,three kinds of "obstacle",including boss,bow high and many micro convex bleb,influencing mould releasing of helmet liner were found out,which will hinder the mould parting and releasing.Measures like 10°counterclockwise rotation of inner liner,and triple mould structure with twice parting were adopted to effectively avoid the effects of three kinds of "obstacle" to die parting and demoulding.Also,a lot of holes were made in cavity for steaming.By taking these measures,the inner liner of the helmet is produced smoothly.关键词
内衬垫/聚苯乙烯/发泡模/障碍体/二次分型Key words
inner packing/polystyrene/foaming mould/obstacle/twice parting分类
矿业与冶金
