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課程設(shè)計(jì)-塑料方凳注射成型設(shè)計(jì)(編輯修改稿)

2025-02-13 02:25 本頁(yè)面
 

【文章內(nèi)容簡(jiǎn)介】 設(shè)計(jì)與校核(1)開(kāi)模行程的校核:校核時(shí)只要使注射機(jī)最大開(kāi)模行程大于模具所需的開(kāi)模距離,即 ≥S (15)對(duì)于單分型面模具,模具所需開(kāi)模距離為: (16)式中: H1—塑件脫模需要的頂出距離,為500mm; H2—塑件高度,為560mm。開(kāi)模行程需要滿(mǎn)足:S=500+5680+7=1067mm,初步選定中的SZ—2500/500注射機(jī)的最大開(kāi)模行程為850mm1067mm,所以該型號(hào)的注射機(jī)不能滿(mǎn)足要求,而SZ—40000/800型號(hào)的注射機(jī)最大開(kāi)模行程為1200mm1067mm,所以滿(mǎn)足要求。注射時(shí)間的校核:根據(jù)公式 (17)式中: Q注射量, V注射速度,所以 (2)保壓壓力及時(shí)間的校核:保壓力的大小取決于模具對(duì)熔體的靜水壓力,并與之間的形狀、壁厚有關(guān)。保壓力可稍低于注射壓力,取保壓壓力為50MPa。PP塑件的保壓時(shí)間約取20s。(3)冷卻時(shí)間設(shè)計(jì)為30s。(4)成型周期的估算:根據(jù)公式: (18)。 注射機(jī)的確定根據(jù)注射壓力,鎖模力以及開(kāi)模行程的校核,最終確定選取注射機(jī)的型號(hào)為:SZ—4000/800。第九章 成型工藝條件根據(jù)前面的設(shè)計(jì)可以確定方凳的注射成型工藝條件如下表:表4 方凳注射的工藝條件料筒溫度(℃) 后段 中段 前段 噴嘴250260220210模具溫度(℃)70注射壓力(MPa)130注射時(shí)間(s)冷卻時(shí)間(s)30保壓時(shí)間(s)20注射總周期(s)保壓壓力(MPa)50熔體溫度(℃)240第十章成本及利潤(rùn)核算 方凳的成本(1)原料的價(jià)格原料的總價(jià)格約為6元。(2)能耗的價(jià)格機(jī)器的功率為20,如果每天24小時(shí)不間斷生產(chǎn),,每天消耗電價(jià)為:=2024=720元(3)工資按每人1400元一月,一臺(tái)機(jī)需3人操作,每天工資為:=14003247。30=140元(4)機(jī)器損耗此機(jī)器的價(jià)格為25萬(wàn)元,假設(shè)可用10年,則每天損耗費(fèi):=250000247。10247。365=注射機(jī)每天生產(chǎn)的凳子數(shù)個(gè)(5)每個(gè)凳子所需的其它成本 (6)塑料方凳的總成本為Y=6+=7元注射機(jī)每天生產(chǎn)895個(gè)方凳,每個(gè)方凳的價(jià)格為12元,則每天的利潤(rùn)為:L=(12-7)895-720-140-=。第十一章 課程設(shè)計(jì)總結(jié)塑料方凳的設(shè)計(jì)選用的基體樹(shù)脂是聚丙烯,并通過(guò)加入助劑來(lái)使得塑料等達(dá)到預(yù)期的效果,改善聚丙烯的力學(xué)性能,并且可以降低成本,選用注射成型的方式來(lái)生產(chǎn)方凳,選用的注射機(jī)型號(hào)為SZ—4000/800,并確定在注射時(shí)得各個(gè)工藝參數(shù)。方凳能承受的載荷條件要達(dá)到784N,并能承受40℃的高溫和—10℃的低溫,設(shè)計(jì)洛氏硬度70,彎曲強(qiáng)度45MPa,凳子成型收縮率%,缺口沖擊強(qiáng)度55 ,斷裂伸長(zhǎng)率100200%。在設(shè)計(jì)的最后進(jìn)行了成本和利潤(rùn)的估算。參考文獻(xiàn). 北京:化學(xué)工業(yè)出版社 2005;2 周達(dá)飛 . 北京:中國(guó)輕工業(yè)出版社 2010;3 . 廣東:廣東科技出版社 2004。 請(qǐng)您刪除一下內(nèi)容,O(∩_∩)O謝謝?。?!Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。llwait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, it
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