注塑模外文翻譯word版(編輯修改稿)
2024-09-18 00:49 本頁面
【文章內(nèi)容簡介】 is then free to fall between the floating cavity plate and the feed moving half continues to move back until the ejector system is operated and the moldings are ejected（Figure31（c））.When the mould is closed,the respective plates are returned to their molding position and the cycle is repeated.Feed SystemIt is necessary to provide a flowway in the injection mould to connect the nozzle（of the injection machine）to each flowway is termed the feed the feed system prises a sprue,runner and terms apply equally to the flowway itself,and to the molded material which is remove from the flowway itself in the process of extracted the molding.A typical feed system for a fourimpression,two platetype mould is shown in is seen that the material passes through the sprue,main runner,branch runner and gate before entering the the temperature of molten plastic is lowered which going through the sprue and runner,the viscosity will rise。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
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