【正文】 process to understand the mold structure and working principle.Key words：base of fourwheel toys、molding process、mold design、injection mold目錄1 緒 論..................................................................................................................................................1 模具，模具在國民經濟中的地位..........................................................................................1 模具工業(yè)的發(fā)展方向............................................................................................................1 模具工業(yè)在我國的發(fā)展現狀................................................................................................2 模具工業(yè)在國際上的發(fā)展水平............................................................................................3 本課題研究的意義................................................................................................................32 工藝分析...........................................................................................................................................4 塑件結構的工藝性分析........................................................................................................4.............................................................................................................53 模具設計...........................................................................................................................................6 .........................................................................................................................................6.........................................................................................................................7 注射機型號確定....................................................................................................................8.....................................................................................................9...............................................................................................................................11.......................................................................................................................12 .......................................................................................................................13.......................................................................................................................13.......................................................................................................... 144 合模導向機構設計.........................................................................................................................14...........................................................................................................................14...........................................................................................................15...........................................................................................................................15...........................................................................................................................16.......................................................................................................16 5 模架的確定和標準件的選用.........................................................................................................17...........................................................................................................................17...........................................................................................................18 ...........................................................................................................20 型腔成型尺寸計算..............................................................................................................226 脫模機構設計.................................................................................................................................24 脫模機構的作用和設計原則...............................................................................................24 ....................................................................................................................