模具設計外文翻譯--注塑成型

1、<p><b>　　注塑成型</b></p><p>　　在注塑成型中，塑料顆?？恐辛牧隙愤M入加熱桶。當螺桿柱塞將塑料顆粒緩慢向前推進，塑膠被推進能使之溶化的加熱腔。由于柱塞向前運動，溶化塑料壓迫通過正對著模具的噴嘴、澆口和熱道系統(tǒng)進入型腔。模具保持冷卻，因此模具一旦被填滿，塑料就開始凝固。</p><p>　　對于注塑周期開始，四個標準必須滿足：模具打開

2、，推桿收回，開始注射，傳輸向前。當這標準都達到了，注射周期伴隨著模具的閉合開始。這個過程通常要求盡快完成，臨近結束時慢慢靠近。模具工作要求低速和低氣壓閉合。它通常在模具導桿開始運作前，必須正確設計位置以防止意外損壞模具。當模具與伴觸鉗噸位接觸，隨即溶化塑料本注射入模具。材料通過澆口套進入模具，之后流道系統(tǒng)將材料傳遞到澆口。澆口引導材料進入模具型腔從而形成所要的零件。這個注射的過程通常有速率的控制。</p><p>

3、;　　當零件差不多充滿型腔時，注射控制從速率控制轉向壓力控制，稱為保壓周期。壓力必須保持直到澆口處凝固從而避免熔融塑料的回流。冷卻時間主要取決于零件的壁厚和材料。注射產(chǎn)品通常要求快速冷卻。水通常經(jīng)過水道進入模具加快冷卻速度。在冷卻周期后部分，澆口已經(jīng)凝固，塑化發(fā)生。</p><p>　　塑化是熔融塑料好人準備下次注射的一個過程。材料在料斗通過料斗頸部開始進入料筒。料斗頸部必須保持冷卻以防止因為料筒太熱而導致塑料顆

4、粒熔在一起。料筒包含一個用于剪切熔料的螺桿，它由三部分組成。第一部分是流入部分，它推動塑料小球向前運動并要求料筒溫度高使得塑料小球軟化。螺紋深度一致且最深的就在這一部分。下一部分是轉動部分，這一部分負責通過剪切熔融材料。在這一部分，螺紋深度不斷地減少，壓縮熔料。最后一部分是計量剖面，這一部分螺紋深度淺薄，提高熔融的質量和顏色的分布。在螺桿前面的是能夠讓螺桿同時作為擠出機和柱塞的止回閥。當注射螺桿倒退以便形成注射，止會裝置引導材料流到螺桿

5、的前面行成一熔料池或注射。在注射中，止回裝置防止注射流回螺桿部分。 </p><p>　　當注射開始建立且冷卻時間結束，模具打開。模具打開必須遵守慢——快——慢。模具必須慢慢打開以釋放在注射過程中產(chǎn)生的真空以防止零件停留在定模上。因為推出系統(tǒng)的移動在定模上，所以要盡量避免這種情況。然后盡快地打開模具，如果沒有使用機器手，模具只需要打開夠零件移出的距離。即將結束時必須減速以補償模具沖量。如果不放慢機器速度就不能準確

6、定位，產(chǎn)生的沖擊可能損壞機器。當模具打開時，推桿向前運動，推動零件。當推桿返回，所有的成型循環(huán)標準都達到，那么下個成型周期可以開始。</p><p>　　基本注射周期如下：合?！⑸溲b置移動——注入塑料——測定——運輸返回——開模——推出零件。有些機器是由電動機代替液壓機或二者兼而有之。冷卻水道，協(xié)助冷卻模具和塑料加熱固化。冷卻不當可導致扭曲成型。當模具打開，零件在模具內部的推桿的協(xié)助下被推開，成型周期完成。&

7、lt;/p><p>　　樹脂或者注坯模型的原材料，通常以藥丸或粒子形式被提供。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。在料筒內的螺桿由電機轉動，原料顆粒將螺桿的螺紋槽填滿。螺桿的螺紋深度往模具的一端減少，壓縮已加熱的塑料。當螺桿轉動，塑料顆粒由螺桿帶動前進，并且承受溶化所需要的極端的壓力和摩擦。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。</p><p>　

8、　通過流道進入模具型腔的塑料也會凝固，形成一個附加的框架。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。澆口和流道系統(tǒng)能夠被剪斷、扭斷和重復利用，有時在線條機構旁邊被顆?；?。有些模具被設計成零件自動脫離的形式。</p><p>　　·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)

9、的設備都需要技術改造。這幾年來，我國塑機行業(yè)的技術進步十分顯著，尤其是注塑機的技術水平與國外名牌產(chǎn)品的差距大大縮小，在控制水平、產(chǎn)品內部質量和外觀造型等方面均取得顯著改觀。選擇國產(chǎn)設備，以較小的投入，同樣也能生產(chǎn)出與進口設備質量相當?shù)漠a(chǎn)品。這些為企業(yè)的技術改造創(chuàng)造了條件。</p><p>　　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

10、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)。</p><p>　　塑料注射成型技術是根據(jù)壓鑄原理從十九世紀末二十世紀初發(fā)展起來的，是目前塑料加工中最普遍采用的方法之一。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） </p><p>　　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

11、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，注射完畢還要有一段保壓時間以向模腔內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物料反流。因此，注射裝置必須保證塑料均勻塑化，并有足夠的注射壓力和保壓壓力。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。 </p><p><b>　　注：</b></p><p><b>　

12、　注塑機的動作程序：</b></p><p>　　噴嘴前進→注射→保壓→預塑→倒縮→噴嘴后退→冷卻→開模→頂出→退針→開門→關門→合?！鷩娮烨斑M</p><p>　　注塑機操作項目：注塑機操作項目包括控制鍵盤操作、電器控制柜操作和液壓系統(tǒng)操作三個方面。分別進行注射過程動作、加料動作、注射壓力、注射速度、頂出型式的選擇，料筒各段溫度及電流、電壓的監(jiān)控，注射壓力和背壓壓力的調節(jié)等&

13、lt;/p><p>　　Injection molding</p><p>　　In injection molding, plastic particles by neutral from hopper into heat barrel. When screw plunger will plastic particles slow advance, plastic is advancing

14、can make the melting of heating chamber. Because the plunger moving forward, melting plastic oppression by opposite the mould of nozzle, sprue and hot word systems into a cavity. Mould keep cooling, thus mould once be fi

15、lled, plastic began to solidify.</p><p>　　For injection molding cycle begins, the four standard must satisfy: mold open, push rod back, start injection, transmission forward. When this standard has achieved,

16、 injection cycle with mold closed began. The process is usually required to quickly finish, near the end of the approaching. Mould work requirements low and depression closure. It is usually in the mold guide bar begins

17、operation before, we must properly design position to prevent accidental damage mold. When the companion touch clam</p><p>　　If parts are almost full of cavity, injection control from rate controlling steeri

18、ng pressure control, called pressure-keeping cycle. Pressure must be kept until sprue place to avoid molten plastic solidification of backflow. The cooling time mainly depends on the part of wall thickness and materials.

19、 Injection products usually require fast cooling. Water usually through waterway into the mold speed up the cooling speed. In cooling cycle after part, sprue has solidification, plasticizing happen.</p><p>　

20、　Plasticizing is molten plastic injection of a good man and prepare the next process. Materials in the hopper through hopper neck began to enter a nitrogen-treated barrel. Hopper neck must keep cooling to prevent because

21、 nitrogen-treated barrel too hot to plastic particles melt together. Contains a nitrogen-treated barrel for shear molten material screw, it consists of three parts. The first part is inflows part, which promotes plastic

22、ball forward movement and requirements for stove temperature </p><p>　　When injected began to establish and cooling time end, mould open. Mould open must abide by the slow - fast - slow. Molds must slowly op

23、ened 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

24、 not using machine hand, mould only need to open enough to remove the parts distance. End must slow down to compensate mould impulse. If you don</p><p>　　Basic injection cycle as follows: shut the mould -- -

25、 injection plastic injection device that moves back -- -- -- determination transport cavity -- introducing parts. Some machines is from motor instead of hydraulic press or both. The cooling channels, assist cooling mould

26、 and plastic heat cure. Cooling undeserved can cause distortion forming. When the mould parts in the mold open, with the assistance of the internal putts burst open, and shape cycle completed.</p><p>　　Resin

27、 or note billet model of the raw material, usually in pills or particle forms are provided. Resin balls into a great leakage at the bottom of the hopper, hopper and cylindrical level material barrel connections. In a nit

28、rogen-treated barrel within the screw by motor rotation, raw materials particles will screw thread slot fill. The screw thread depth to one end of the mould has heating decreases, compression plastic. When screw rotation

29、, plastic particles by screw drive advance, and bear me</p><p>　　Through the flow into the mold cavity plastic will solidify, forming an additional framework. This by molten residual material composition of

30、the framework and melting resin flows from hopper wushan, it and cavity mould protrusion parallel, But with the direction of vertical shunt compresses the tao, used for molten plastic relay to the gate. Gate and runner s

31、ystem can be cut, twisting and reuse, sometimes in line - beside. By institutions Some mould are designed to automatically from parts of t</p><p>　　China plastics processing enterprise star ROM the cloth, th

32、roughout the country, the technology of equipment level irregular, most processing enterprises equipment all need technical reformation. In recent years, our country plastic machinery industry technology progress and rem

33、arkable, especially injection technology level and foreign famous brand product in the gap considerably reduced and internal control level, product quality and appearance shape, etc are achieved significant change. Choos

34、e</p><p>　　In order to strengthen the plastic machinery, the use, maintenance and management, China's relevant departments have established related standards and implementation rules, and required the eq

35、uipment management departments and production enterprise for equipment management and use achieves "scientific management, correctly use and reasonable lubrication, elaborate maintenance, maintenance regularly, plan

36、 maintenance, improve equipment intact rate, make the equipment frequently in good condition.</p><p>　　Plastic injection molding technology is based on the principle of die-casting from 19th century and the

37、early twentieth century developed, is currently the most widely used processing plastic one way. The method applies to all thermoplastics and parts of thermosetting plastic (occupy plastic volume 1/3)</p><p>

38、;　　Injection system is the heart of injection molding machine, its effect is guaranteed timing, quantitatively the material plastication heating, and then taking certain pressure and speed of the equivalent as soon as po

39、ssible an injection quantity of molten plastic injection mold cavity, even for a complete injection time pressure-keeping to mold cavity supplement for cooling and contraction of the cladding material, make the products

40、close-grained and prevent mold cavity material reverse flow. Th</p><p><b>　　Note:</b></p><p>　　Injection action program:</p><p>　　Nozzle forward - injection - pressure-k

41、eeping - plastic shrinkage furnace-rough pour gets back - cooling furnace-rough furnace-rough nozzle open mold - ejection - back needle - open - closed - shut the mould - nozzle forward</p><p>　　Injection mo

42、lding machine operation projects: injection molding machine operation project including control keyboard, electric contorol operation and hydraulic system operating three aspects. Separately injection process action, cha

43、rging action, injection pressure and injection velocity, ejector type selection, nitrogen-treated barrel paragraphs temperature and current and voltage monitoring, injection pressure and back pressure adjustment, etc<