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畢業(yè)論文-開關(guān)上的旋轉(zhuǎn)蓋注塑模設(shè)計(完整版)

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【正文】 過程使塑件從成型零件上脫出的機構(gòu)稱 頂出機構(gòu)。 圖 6 分流道示意圖 4)澆口的設(shè)計 根據(jù)澆口的成型要求及型腔的排列方式,選用側(cè)澆口較為合適。 根據(jù)設(shè)計手冊查得 0 型注射機噴嘴有關(guān)尺寸如下: 噴嘴前端孔徑: d0=φ 4mm 噴嘴前端球面半徑: R0= 18mm 為了使凝料能順利拔出,主流道的小端直徑 D 應(yīng)大于注射 噴嘴直徑 d。 ( 2)確定有利的留模方式 ,便于塑件順利脫模 ( 3)保證塑件的精度要求 ( 4)滿足塑件的外觀質(zhì)要求 ( 5)便于模具加工制造 ( 6) 成型面積的影響 ( 7)有利于提高排氣效果 ( 8)對側(cè)向抽芯的影響 綜合考慮以上分型面的選擇原則,結(jié)合制 品的結(jié)構(gòu)形狀,該塑料飯盒的分型面設(shè)計如圖 31 所示 圖 3 產(chǎn)品分型面示意圖 型腔的布置方案與確定 型腔的布置方案常用的有兩種,第一種方案為平衡式,該方案特點是從主流道到各型腔澆口的分流道的長度,截面形狀 1 尺寸均對應(yīng)相同,可實現(xiàn)均衡進料注射模設(shè)計說明書 8 和同時充滿型腔的目的。z=[(1+s)Ls+X△ ]0/amp。 ? 采用螺桿式注射機噴嘴時 ,孔徑宜大 ,以防死角滯 料 .好不帶鑲件 ,如注射模設(shè)計說明書 4 有鑲件應(yīng)預(yù)熱 。在設(shè)計該模具的同時總結(jié)了以往模具設(shè)計的一般方法、步驟,模具設(shè)計中常用的公式、數(shù)據(jù)、模具結(jié)構(gòu)及零部件。此次設(shè)計要用到 PRO/E、 AutoCAD、 Wore用 PRO/E進行零 件圖實體造型、然后分模制造,再把它調(diào)入 CAD進行模具各系統(tǒng)的設(shè)計,零件的產(chǎn)品說明書用 Wore進行編制等。 ? 要求塑件精度高時,模具溫度可控制在 50~60C,要求塑件和光澤耐熱時,應(yīng)控制在 60~80C。z 型芯高度尺寸: H0/mamp。第二種方案為非平衡式,該方案特點是從主流道到各型腔澆口的分流長度不相等,因而不利于平均衡進料,但可以縮短流道的總長度,為達(dá)到同時充滿型腔的目的,各澆口的截面尺寸制作不相同。 D= d+(~2)mm=φ 4+2=φ 6mm 該主流道設(shè)計為圓錐型,錐角為 3 度,內(nèi)表面的粗糙度 微米。 注射模設(shè)計說明書 11 側(cè)澆口一般開設(shè)在模具的分型面上,從制品的邊緣進料,故也稱之為邊 緣澆口。 頂出機構(gòu)可以分為: ( 1)推桿推出機構(gòu) ( 2)推管推出 ( 3)推件板推出機構(gòu) ( 4)活動鑲塊及模推出 ( 5)多元綜合推出機構(gòu) 頂出機構(gòu)的原則: 因為塑料收縮是抱緊凸模,所以頂出力的作用點應(yīng)盡量靠近凸模 頂出力應(yīng)作用在塑件剛性和強度最大的部位,如加強筋,壁厚等處。否則,被壓縮的空氣產(chǎn)生高溫,會引起塑件局部碳化燒焦,或塑件產(chǎn)生氣泡,或使塑件熔接不良引起強度下降,甚至充模不滿。對型芯和型腔改進后,其的配合可以進行定位。 S≥ 2H1+H2+(5~ 10)MM 因為本模具的澆注系統(tǒng)和塑件的特殊關(guān)系,澆注系統(tǒng)和塑件的高度就已經(jīng)包括了頂出距離。 十 一 、 模 具 的 裝 配 裝配模具是模具制造過程中的最后階段,裝配精度直接影響到模具的注射模設(shè)計說明書 16 質(zhì)量、壽命和各部分的功能。 ( 4)在裝配過程中盡量保持原加工尺寸的基準(zhǔn)面,以便總裝合模調(diào)整時檢查; ( 5)組裝導(dǎo)向系統(tǒng)并保證開模合模動作靈活,無松動和卡滯現(xiàn)象; ( 6)組裝冷卻和加熱系統(tǒng),保證 管路暢通,不漏水,不漏電,門動作靈活緊固所連接螺釘,裝配定位銷。不正常的損壞絕大多數(shù)是由于操作不當(dāng)所致模具的徹底報廢。 以計算機為手段,專用模具分析設(shè)計軟件為工具設(shè)計模具。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to
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