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首頁(yè) » 基礎(chǔ)知識(shí) » 熱流道(熱流道)

熱流道(熱流道)

分類：基礎(chǔ)知識(shí) 日期：2022-06-28 15:18 瀏覽：6 次

1.熱流道

熱流道技術(shù)是應(yīng)用于塑料注塑模澆注流道系統(tǒng)的一種先進(jìn)技術(shù)，是塑料注塑成型工藝發(fā)展的一個(gè)熱點(diǎn)方向.所謂熱流道成型是指從注射機(jī)噴嘴送往澆口的塑料始終保持熔融狀態(tài)，在每次開模時(shí)不需要固化作為廢料取出，滯留在澆注系統(tǒng)中的熔料可在再一次注射時(shí)被注入型腔. 理想的注塑系統(tǒng)應(yīng)形成密度一致的部件，不受所有的流道，飛邊和澆口水口的影響.相對(duì)冷流道來(lái)講，熱流道要做到這一點(diǎn)，就必須維持材料在熱流道內(nèi)的熔融狀態(tài)，不會(huì)隨成形件送出.熱流道工藝有時(shí)稱為熱集流管系統(tǒng)，或者稱為無(wú)流道模塑. 基本來(lái)講，可以把熱集流管視為機(jī)筒和注塑機(jī)噴嘴的延伸部分.熱流道系統(tǒng)的作用就是把材料送到模內(nèi)的每一澆口.。

2.什么是熱流道技術(shù)

熱流道是通過(guò)加熱的辦法來(lái)保證流道和澆口的塑料保持熔融狀態(tài)。

由于在流道附近或中心設(shè)有加熱棒和加熱圈，從注塑機(jī)噴嘴出口到澆口的整個(gè)流道都處于高溫狀態(tài)，使流道中的塑料保持熔融，停機(jī)后一般不需要打開流道取出凝料，再開機(jī)時(shí)只需加熱流道到所需溫度即可。 因此，熱流道工藝有時(shí)稱為熱集流管系統(tǒng)，或者稱為無(wú)流道模塑。

熱流道技術(shù)的優(yōu)、缺點(diǎn) 熱流道技術(shù)與常規(guī)的冷流道相比有以下的好處： 1、節(jié)約原材料，降低成。 2、縮短成型周期，提高機(jī)器效率 3、改善制品表面質(zhì)量和力學(xué)性能。

4、不必用三板式模具即可以使用點(diǎn)澆口。 5、可經(jīng)濟(jì)地以側(cè)澆口成型單個(gè)制品。

6、提高自動(dòng)化程度。 7、可用針閥式澆口控制澆口封凍。

8、多模腔模具的注塑件質(zhì)量一致。 9、提高注塑制品表面美觀度。

但是，每一項(xiàng)技術(shù)都會(huì)有自身的缺點(diǎn)存在，熱流道技術(shù)也不例外： 1、模具結(jié)構(gòu)復(fù)雜，造價(jià)高，維護(hù)費(fèi)用高。 2、開機(jī)需要一段時(shí)間工藝才會(huì)穩(wěn)定，造成開價(jià)廢品較多。

3、出現(xiàn)熔體泄露、加熱元件故障時(shí)，對(duì)產(chǎn)品質(zhì)量和生產(chǎn)進(jìn)度影響較大。 上面第三項(xiàng)缺點(diǎn)，通過(guò)采購(gòu)質(zhì)量上等的加熱元件、熱流道板以及噴嘴并且使用時(shí)精心維護(hù)，可以減少這些不利情況的出現(xiàn)。

3.要學(xué)熱流道設(shè)計(jì)需要具備哪些最基本的東東

熱流道是在注塑模具中使用的，將融化的塑料注入到模具的空腔中的加熱組件集合。

熱流道設(shè)計(jì)現(xiàn)在越來(lái)越專業(yè)了，要靠的是經(jīng)驗(yàn)的，因?yàn)楝F(xiàn)在的塑料種類越來(lái)越多的。所以熱流道的經(jīng)驗(yàn)是很重要的。選形也可以叫選技熱流道結(jié)構(gòu)，以前也是學(xué)模具的，最后去格潤(rùn)泰熱道做售后， 最后才學(xué)的設(shè)計(jì)。

一般說(shuō)來(lái)，熱流道系統(tǒng)分為單頭熱流道系統(tǒng)、多頭熱流道系統(tǒng)以及閥澆口熱流道系統(tǒng)。單頭熱流道系統(tǒng)主要由單個(gè)噴嘴、噴嘴頭、噴嘴連接板、溫控系統(tǒng)等組成。

單頭熱流道系統(tǒng)塑料模具結(jié)構(gòu)較簡(jiǎn)單。將熔融狀態(tài)塑料由注塑機(jī)注入噴嘴連接板，經(jīng)噴嘴到達(dá)噴嘴頭后，注入型腔。需要控制尺寸d、D、L和通過(guò)調(diào)整噴嘴連接板的厚度尺寸，使定模固定板壓緊噴嘴連接板的端面，控制噴嘴的軸向位移，或者直接利用注塑機(jī)噴嘴頂住噴嘴連接板的端面，也可達(dá)到同樣目的。在定模固定板的合適位置設(shè)置一條引線槽，讓電源線從模具內(nèi)引出與安裝在模具上的接線座連接。

4.熱流道問(wèn)題

一：漏膠原因分析 1。

分流板型腔板高于分流板墊片 2。 幾支熱噴嘴不在同一平面 3。

中心墊片、中心定位銷、防轉(zhuǎn)銷高度有誤差 4。 分流板堵頭漏膠 5。

分流板主射嘴漏膠 6。 封膠面加工不到位 7。

模板變形 8。 分流板變形 二：溫度不穩(wěn)定原因分析 1。

溫控器質(zhì)量不好 2。 電纜線連接有松動(dòng) 3。

熱流道和模具接觸太多，熱損失嚴(yán)重 4。 熱電偶被壓壞 三：實(shí)際溫度和溫控器顯示的溫度不一致原因 1。

溫控器和熱流道的熱電偶分度號(hào)不一致，即“J”“K”不符 2。 溫控器被調(diào)成了華氏度 3。

兩組熱電偶交叉互換，導(dǎo)致測(cè)溫失靈 4。 熱電偶線被壓壞 5。

溫控器出了其他故障 四：閥針運(yùn)動(dòng)不暢原因分析 1。 氣壓壓力不足、氣路不通和密封不好 2。

缸體系統(tǒng)被咬死：缸體、分流板和噴嘴不同心，碼模板積熱太多 3。 閥針與導(dǎo)套之間有漏料，冷料包住了閥針 4。

封膠不到位，如果其他正常，則考慮閥針回料槽 5。 檢查注塑信號(hào)連接是否正確 五：澆口處冷膠過(guò)快原因 1。

冷卻水太近，太快 2。 熱流道熱損失太大 3。

熱噴嘴溫度太低 4。 熱噴嘴選型不正確 六：射不出膠原因 1。

澆口被雜質(zhì)堵住了 2。 溫度太低 3。

熱損失太大 4。 溫控器顯示溫度與實(shí)際溫度不符 七：換色過(guò)程慢可執(zhí)行如下操作 1。

將模溫提高15度，噴嘴和分流板提高50度 2。 用清洗料清洗料筒 3。

使用下次生產(chǎn)所需的無(wú)色標(biāo)準(zhǔn)原材料循環(huán)生產(chǎn)10次 4。 降低噴嘴和分流板的溫度20度，注射三次 5。

重復(fù)第四步驟兩次后，再降低模溫，換色完畢。

熱流道基礎(chǔ)知識(shí)

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