注塑模外文翻譯-全文預(yù)覽
【正文】 ），經(jīng)過(guò)適當(dāng)?shù)谋哼^(guò)程，注塑機(jī)帶動(dòng)模具開(kāi)模。彈簧套在導(dǎo)柱上，一同裝在浮動(dòng)型腔板上相應(yīng)的彈簧座處（見(jiàn)圖 52），這種形式在彈簧裝配中十分常見(jiàn)。 模具的開(kāi)模順序是：浮動(dòng)型腔板和定模板先分開(kāi)。 浮動(dòng)型腔板的最大運(yùn)動(dòng)距離由限位釘或類似裝置控制。這樣設(shè)計(jì)的動(dòng)模部分與最基本的模具結(jié)構(gòu)中的動(dòng)模部分相同。當(dāng)然 ，生產(chǎn)熱塑性塑料時(shí)，模具必須被加熱，而不是冷卻。 許多往復(fù)螺桿式注塑機(jī)能生產(chǎn)熱固性塑料。防倒流閥能 夠阻止受壓熔體倒流進(jìn)螺桿的螺旋區(qū)。樹(shù)脂原料進(jìn)入旋轉(zhuǎn)的螺桿時(shí)，要經(jīng)過(guò)圖示的三個(gè)區(qū)域：喂入?yún)^(qū)、壓實(shí)區(qū)和計(jì)量區(qū)。注塑模具有以下優(yōu)點(diǎn)：（?。┹^高的成型速度使大批量生產(chǎn)成為可能；（ⅱ）為成型具有不同使用性能的熱塑性材料提供了較寬的選擇；（ⅲ）可以成型帶有螺紋的塑件、側(cè)向凹陷的塑件、帶有側(cè)孔的塑件以及較大的薄壁件。（ ⅱ ） the ejector plate assembly。 1 The Injection Molding The injection molding Injection molding is principally used for the production of the thermoplastic parts,although some progress has been made in developing a method for injection molding some thermosetting problem of injection a method plastic into a mold cavity from a reservoir of melted material has been extremely difficult to solve for thermosetting plastic which cure and harden under such conditions within a few principle of injection molding is quite similar to that of process consists of feeding a plastic pound in powered or granular form from a hopper through metering and melting stages and then injecting it into a a brief cooling period,the mold is opened and the solidified part machine advantage of injection molding are：（ ⅰ ） a high molding speed adapter for mass production is possible；（ ⅱ ） there is a wide choice of thermoplastic materials providing a variety of useful properties；（ ⅲ ） it is possible to mold threads,undercuts,side holes,and large thin section. The injectionmolding machine Several methods are used to force or inject the melted plastic into the most monly used system in the larger machines is the inline reciprocating screw,as shown in Figure screw acts as a bination injection and plasticizing the plastic is fed to the rotating screw,it passes through three zones as shown：feed,pression,and the feed zone,the screwflight depth is gradually reduced,force the plastic to work is converted to heat by conduction from the barrel the chamber in front of the screw bees filled,it forces the screw back,tripping a limit switch that activates a hydraulic cylinder that forces the screw forward and injects the fluid plastic into the closed antiflowback valve presents plastic under pressure from escaping back into the screw flight. The clamping force that a machine is capable of exerting is part of the size designation and is measured in ruleofthumb can be used to determine the tonnage required for a particular is based on two tons of clamp force per square inch of projected the flow pattern is difficult and the parts are thin,this may have to go to three or four tons. Many reciprocatingscrew machines are capable of handing thermosetting plastic these materials were handled by pression or transfer materials cure or polymerize in the mold and are ejected hot in the range of 375176。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 materia
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