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( 3) 冷卻價(jià)質(zhì)一般采用常溫水,以冷卻水出、入口處溫差小于 5176。為好,冷卻水的流速 以盡可能高為好,其流動(dòng)狀態(tài)以湍流為佳。 ( 4) 塑件壁厚越薄,所需冷卻時(shí)間越少。反之壁厚越厚,所需冷卻時(shí)間越長(zhǎng)。 ( 5) 冷卻回路的分布即冷卻回路距型腔距離和通道之間的間隔應(yīng)能保證模腔表面的溫度均勻。 ( 6) 強(qiáng)化澆口冷卻,塑料充模時(shí)澆口附近溫度最高,因此澆口附近最好能強(qiáng)化冷卻。 模具冷卻系統(tǒng)設(shè)計(jì)要點(diǎn) ( 1) 冷卻水道應(yīng)與成型面各處距離相等,排列與成型面形狀盡可能相符; ( 2) 冷卻水道應(yīng)使成型零件表面冷卻均勻,模具各處的溫差不大;冷卻水孔距型腔的距離一 般為 1525mm,太近則冷卻不均勻,太遠(yuǎn) 則冷卻效率低;冷卻水孔直徑一般為Φ 812mm ( 3) 循環(huán)式冷卻水道中冷卻介質(zhì)的流程應(yīng)相等; ( 4) 冷卻水道應(yīng)先通過(guò)澆口部位并沿料流方向流動(dòng),即從模溫高區(qū)域流向模溫低區(qū)域; ( 5) 冷卻水道不應(yīng)設(shè)置在塑件可能出現(xiàn)熔接痕的部位; ( 6) 冷卻水道應(yīng)防止漏水 ,特別是通過(guò)組合鑲件時(shí),應(yīng)考慮密封問(wèn)題; 第六章 冷卻系統(tǒng)設(shè)計(jì)模架的選擇和設(shè)計(jì) 30 ( 7) 冷卻水嘴應(yīng)設(shè)在非操作側(cè),并考慮不與注塑機(jī)導(dǎo)向柱干涉; ( 8) 動(dòng)、定模原則上應(yīng)分別單獨(dú)設(shè)置冷卻系統(tǒng),以便調(diào)節(jié)控制塑件的變形等缺陷; 一般公司運(yùn)水設(shè)計(jì)的一些規(guī)定: 運(yùn)水通道常用規(guī)格有φ φ φ φ 12。設(shè)計(jì)時(shí)盡量采用大直徑通道以增加熱交換量。其對(duì)應(yīng)的管接頭規(guī)格常用英制 BSPT型 1/8″、 1/4″、 3/8″, 以上無(wú)特殊規(guī)定優(yōu)先選用 1/4″規(guī)格 。 而我選擇的冷卻系統(tǒng)流水途徑如下圖 61所示: 圖 61 模架的選擇和設(shè)計(jì) 根據(jù)型腔的布局以及相互的位置尺寸,再加上成型零件尺寸結(jié)合標(biāo)準(zhǔn)模架,需用模架尺寸為 600x500x401mm的標(biāo)準(zhǔn)模架,可符合要求。模具上所有的螺釘盡量采用內(nèi)六角螺釘;模具表面盡量不要有突出部分;模具外表面應(yīng)光潔,加涂防銹油。兩模板之間有分模間隙,即在裝配、調(diào)適、維修過(guò)程中,可以方便地分開(kāi)兩塊模板。 A板的尺寸 :500x500mm、厚 120mm, 用于固定凸模、導(dǎo)套。固定板應(yīng)有一定的厚度,并有足夠的強(qiáng)度,一般用 45鋼或Q235A制成。 其上的導(dǎo)套孔與導(dǎo)套采用 H7/k6配合,定 模與澆口套采用 H7/m6配合; 因在其上第六章 冷卻系統(tǒng)設(shè)計(jì)模架的選擇和設(shè)計(jì) 31 要開(kāi)冷卻水道,所以厚度取 100mm。 B板的尺寸 :500x500mm、厚 100mm 用于固定凹模、導(dǎo)柱。其作用和 A板相同,一般用 45鋼或 Q235A制成,最好調(diào)質(zhì) 230H— 270HB。 定模座板的尺寸 :600x500mm、厚 35mm, 定模座板是模具與注射機(jī)連接固定的板,材料為 45鋼。 通過(guò) 4個(gè) M12的內(nèi)六角圓柱螺釘與定模固定板連接;定位圈通過(guò) 4個(gè) M6的內(nèi)六角圓柱螺釘與其連接;定模座板與澆口套為 H9/f9配合。 墊塊的尺寸( 120mm 500mm、厚 88mm) 在動(dòng)模座板與支撐板之間形成退出機(jī)構(gòu)的動(dòng)作空間,或是調(diào)節(jié)模具的總厚度,以適應(yīng)著注塑機(jī)的模具安裝厚度要求。該模具采用平行墊塊。材料為 45。 動(dòng)模座板的尺寸; 600mm 500mm、厚 35mm 材料為 45鋼。 推板的尺寸 :320mm 500mm、厚 35mm 材料為 45鋼。用四個(gè)內(nèi)六角螺釘與推板固定板固定。 推桿固定板的尺寸 :320mm 500mm、厚 25mm 材料為 45鋼 綜上所述,我選擇模架型號(hào) CI 5050.第六章 冷卻系統(tǒng)設(shè)計(jì)模架的選擇和設(shè)計(jì) 32 模架結(jié)構(gòu)如圖 62所示: 圖 62 總結(jié) 33 總結(jié) 通過(guò)三個(gè)多月對(duì) 鼠標(biāo)上殼 塑料模具的設(shè)計(jì),我注塑模具的設(shè)計(jì)方法與流程有了一個(gè)比較全面的了解。在這個(gè)不斷設(shè)計(jì)、學(xué)習(xí)、再設(shè)計(jì)的反復(fù)操作過(guò)程中,我們潛移默化地學(xué)習(xí)到了一種科學(xué)的設(shè)計(jì)思路和方法,這對(duì)我們以后的工作態(tài)度和方法將產(chǎn)生積極的影響。特別是在利用現(xiàn)代化的設(shè)計(jì)上,我有了很多 的自己的設(shè)計(jì)思想。 在設(shè)計(jì)的過(guò)程中,遇到了很多的問(wèn)題,尤其是在流道的設(shè)計(jì)、抽芯機(jī)構(gòu)的設(shè)計(jì)以及成型零件的計(jì)算等方面,費(fèi)了很多周折,也走了很多彎路。而在裝配圖的繪制中,又遇到了前面設(shè)計(jì)上的很多結(jié)構(gòu)錯(cuò)誤,對(duì)細(xì)節(jié)的反復(fù)修改較多。經(jīng)過(guò)很長(zhǎng)時(shí)間的思考和查閱資料,才成功地完成了本套模具的設(shè)計(jì)過(guò)程。 當(dāng)然,本模具的設(shè)計(jì)也存在了很多的問(wèn)題,在實(shí)際中也許并沒(méi)有辦法正常運(yùn)作。 也通過(guò)查閱有關(guān)資料,我們也認(rèn)識(shí)到搜索功能在當(dāng)今社會(huì)的重要性,也學(xué)會(huì)如何去尋找著方面的知識(shí)。 在做畢業(yè)設(shè)計(jì)過(guò)程中慢慢的鞏固了 PROE的運(yùn)用和模具設(shè)計(jì)知識(shí)。致謝 34 致謝 本設(shè)計(jì)在 史 老師的悉心指導(dǎo)和嚴(yán)格要求下業(yè)已完成,從課題選擇、方案論證到具體設(shè)計(jì)和調(diào)試,無(wú)不凝聚著 史 老師的心血和汗水,在四年的本科學(xué)習(xí)和生活期間,也始終感受著導(dǎo)師的精心指導(dǎo)和無(wú)私的關(guān)懷,我受益匪淺。在此向 史 老師表示深深的感謝和崇高的敬意。 還要感謝這批熱心的同學(xué)們,沒(méi)有你們的幫助我寸步難行。 不積跬步何以至千里,本設(shè)計(jì)能夠順利的完成,也歸功于各位任課老師的認(rèn)真負(fù)責(zé),使我能夠很好的掌握和運(yùn)用專(zhuān)業(yè)知識(shí),并在設(shè)計(jì)中得以體現(xiàn)。正是有了他們的悉心幫助和支持,才使我的畢業(yè)論文工作順利完成,在 向 全體老師表示由衷的謝意 。感謝他們 對(duì)我 的辛勤栽培。參考文獻(xiàn) 35 參考文獻(xiàn) [1] 《塑料模設(shè)計(jì)手冊(cè)》編寫(xiě)組 .塑料模設(shè)計(jì)手冊(cè) [S].北京 :機(jī)械工業(yè)出版社, 2021 [2] 百度百科 . [3] 王宇平 .公差配合與幾何精度檢測(cè) [M].北京 :人民郵政出版社, 2021:10~ 42 [4] 周繼強(qiáng) .塑料制品及其成形模具設(shè)計(jì) [M]. 北京 :清華大學(xué)出版社, [5] 許靜 .計(jì)算機(jī)在模具設(shè)計(jì)中的應(yīng)用 [M]. 北京 :清華大 學(xué)出版社 ,。 [6] 高嵩峰胡仁喜 .Pro/Engineer 教程 [S].北京 :機(jī)械工業(yè)出版社,:72~ 129 [7] 《塑料模設(shè)計(jì)手冊(cè)》編寫(xiě)組 .塑料模設(shè)計(jì)手冊(cè) [S].北京 :機(jī)械工業(yè)出版社, 2021 [8] 楊永平 .模具技術(shù)基礎(chǔ) [M].北京 :化學(xué)工業(yè)出版社, 2021:70~ 135 [9] 陳靜 .AutoCAD 2021 機(jī)械繪圖 [M].北京 :冶金工業(yè)出版社, :79~ 129 參考文獻(xiàn) 36 您好,為你提供優(yōu)秀的畢業(yè)論文參考資料,請(qǐng)您刪除以下內(nèi)容, O(∩ _∩ )O 謝謝?。?! A large group of tea merchants on camels and horses from Northwest China39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2021. Then they will e back, carrying specialty products from Kazakhstan A s mall art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 19 50s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。s performers of the troupe still tour the region39。s villages and entertain nomadic families, but their fame has spread around the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nas