【正文】 需要從型芯上推下塑件，因此，塑件必須跟隨型芯（一同移動），推出系統(tǒng)裝在動模部分最為合適。也許冷料井更重要的作用是（開模時）幫助澆道凝料推出澆口套。因此，設計時必須充分考慮型腔布局和澆口形式。和模時，模具的各模板回到成型位置，重復下一個注塑循環(huán)。熔體經過澆注系統(tǒng)充滿型腔后（見圖31（a）），經過適當的保壓過程，注塑機帶動模具開模。模具的開模順序是：浮動型腔板和定模板先分開。這樣設計的動模部分與最基本的模具結構中的動模部分相同。許多往復螺桿式注塑機能生產熱固性塑料。樹脂原料進入旋轉的螺桿時，要經過圖示的三個區(qū)域：喂入區(qū)、壓實區(qū)和計量區(qū)。（ⅱ）the ejector plate assembly。however,the viscosity is lowered by shear heat generated when going through the gate to fill the is desirable to keep the distance that the material has to travel down to a minimum to reduce pressure and heat is for this reason that careful consideration must be given to the impression layout gate’s design.A sprue is a channel through which to transfer molten plastic injected from the nozzle of the injector into the is a part of sprue bush,which is a separate part from the mold.A runner is a channel that guides molten plastic into the cavity of a mold.A gate is an entrance through which molten plastic enters the gate has the following function：restricts the flow and the direction of molten plastic；simplifies cutting of a runner and moldings to simplify finishing of parts；quickly cools and solidifies to avoid backflow after molten plastic has filled up in the cavity. slug wellThe purpose of the cold slug well,shown opposite the sprue,is theoretically to receive the material that has chilled at the front of nozzle during the cooling and ejection of greater importance is the fact that it provides position means whereby the sprue bush for ejection purposes.The sprue,the runner and the gate will be discarded after a part is ,the runner and the gate are important items that affect the quality or the cost of parts.Ejection A molding is formed in mould by injecting a plastic melt,under pressure,into an impression via a feed must therefore be removed ,all thermoplastic materials contract as they solidify,which means that the molding will shrink on to the core which forms shrinkage makes the molding difficult to remove.Facilities are provided on the injection machine for automatic actuation of an ejector system,and this is situated behind the moving of this,the mould’s ejector system will be most effectively operated if placed in the moving half of the mould,. the half attached to the moving have stated previously that we need to eject the molding from the core and it therefore follows that the core,too,will most satisfactorily be located in the moving half.The ejector system in a mould will be discussed under three headings,namely：（?。﹖he ejector grid。螺桿同時具有注射和塑化的功能。如果熔體流動困難或塑件較薄，鎖模力應提高到三到四噸。動模部分包括動模板組件、支撐塊、支撐板，推出機構和頂桿推出系統(tǒng)。如果必須使用手動方式取出凝料，開模時取出凝料所需的最小距離應為65mm。我們已經詳細討論模具裝配，再看這類模具的生產循環(huán)過程。動模部分繼續(xù)后退，直到推出機構開始運動，推出塑件（見圖31（c））。澆注系統(tǒng)要保持適當的長度，使熔體的壓力減少和熱量損失降到最低。理論上，冷料井的作用是用來儲存在（塑件）冷卻和推出過程中注塑機噴嘴處所形成的熔體前鋒冷料。因此，模具的推出系統(tǒng)安裝在動模部分將獲得最大效率，例如，這部分（可以）安裝在移動板上。注塑機頂出桿一端帶有螺紋，通過螺紋緊固在推板上。11