機械模具專業(yè)本科畢業(yè)設計外文翻譯-注塑機-文庫吧資料
2024-12-09 17:33本頁面
【正文】 ong enough to provide sufficient space between the feed plate and the floating cavity plate for easy removal of the feed minimum space provide for should be 65mm just sufficient for an operator to remove the feed system by hand if necessary. The desire operating sequence is for the first daylight to occur between the floating cavity ensures the sprue is pulled from the sprue bush immediately the mould is achieve this sequence,springs may be incorporated between the feed plate and the floating cavity springs should be strong enough to give an initial impetus to the floating cavity plate to ensure it moves away with the moving is normal practice to mount the springs on the guide pillars（ Figure32） and acmodate them in suitable pocket in the cavity plate. The major part of the feed system（ runner and sprue） is acmodated in the feed plate to facilitate automatic operation,the runner should be of a trapezoidal form so that once it is pulled from the feed plate is can easily be that if a round runner is used,half the runner is formed in the floating cavity plate,where it would remain,and be prevented from falling or being wiped clear when the mould is opened. Now that we have considered the mould assembly in the some detail,we look at the cycle of operation for this type of mould. The impressions are filled via the feed system（ Figure31（ a）） and after a suitable dwell period,the machine platens mence to force is immediately exerted by the pression springs,which cause the floating cavity plate to move away with the moving half as previously sprue is pulled from the sprue bush by the sprue the floating cavity plate has moved a predetermined distance,it is arrested by the stop moving half continues to move back and the moldings,having shrunk on to the cores,are withdrawn from the pin gate breaks at its junction with the runner（ Figure31（ b）） . The sprue puller,being attached to the moving half,is pulled through the floating cavity plate and thereby release the feed system which 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 System It 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。
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