模具設計外文翻譯--注塑成型-模具設計-文庫吧資料
2025-01-27 05:41本頁面
【正文】 cooling to prevent because nitrogentreated barrel too hot to plastic particles melt together. Contains a nitrogentreated barrel for shear molten material screw, it consists of three parts. The first part is inflows part, which promotes plastic ball forward movement and requirements for stove temperature high make plastic pellets softened. Threaded uniform depth and the deepest in this part. The next part of the rotational part, is responsible for this part of molten material by shear. In this part, threaded depth constantly decrease, pression cladding material. Last part is measurement profile, this part of the threaded depth shallow, improve the quality of the melt and color of the distribution. In the screw front are able to let screw as extruder and piston check valves. When injected screw retrograde injection, stop order to form will guide material flow to the device of the screw front line to bee a molten material pool or injection. The injection, check device to prevent injection flow back to screw parts. When injected began to establish and cooling time end, mould open. Mould open must abide by the slow fast slow. Molds must slowly opened to release the injection produces in the process of vacuum to prevent parts stay in fixed modules. Because of mobile launch system in fixed mode, so try to avoid this kind of circumstance. Then quickly open mold, if not using machine hand, mould only need to open enough to remove the parts distance. End must slow down to pensate mould impulse. If you don39。能滿足這些要求的注射裝置主要有柱塞式、柱塞 —螺桿式、螺桿式等。該法適用于全部熱塑性塑料和部分熱固性塑料（約占塑料總量的 1/3） 注射系統(tǒng)是注塑機的心臟部分，其作用是保證定時、定量地把物料加熱塑化，然后以一定的壓力和盡快的速度把相當于一次注射量的熔融塑料注入模腔內(nèi)，注射完畢還要有一段保壓時間以向模腔內(nèi)補充一部分因冷卻而收縮的熔料，使制品密實和防止模腔內(nèi)物料反流。 為加強塑料機械的使用、維護和管理工作，我國有關部門已制訂了有關標準和實施細則，要求各設備管理部門和生產(chǎn)企業(yè)對設備的管理和使用做到 “科學管理、正確使用、合理潤滑、精心維護、定期保養(yǎng)、計劃檢修，提高設備完好率，使設備經(jīng)常處于良好 態(tài)。選擇國產(chǎn)設備，以較小的投入，同樣也能生產(chǎn)出與進口設備質(zhì)量相當?shù)漠a(chǎn)品。 我國塑料加工企業(yè)星羅其布，遍布全國各地，設備的技術水平參差不齊，大多數(shù)加工企業(yè)的設備 都需要技術改造。有些模具被設計成零件自動脫離的形式。這個由熔融的殘料構成的框架，是溶化的樹脂從料斗流經(jīng)型腔的主通道，它與模具的開合方向平行；而與開合方向垂直的分流道，用于將熔融塑料傳遞到澆口。在溶化的過程期間，料筒的外部附有電熱絲以協(xié)助熱化和溫度控制。螺桿的螺紋深度往模具的一端減少，壓縮已加熱的塑料。樹脂小球涌入有大漏底的料斗中，料斗與圓柱形的水平料桶相連接。當模具打開，零件在模具內(nèi)部的推桿的協(xié)助下被推開，成型
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