【正文】 mm2 A 澆 = 塑 =*13478= 塑件和澆注系統(tǒng)在分型面上總的投影面積 A 總 = n（ A 塑 + 塑） = F 脹 =A 塑 *P 模 =*30= P 模是型 腔內(nèi)的平均壓力值為 30MPa，可知該注射機(jī)的公稱鎖模力 F 鎖 =1800KN，鎖模力安全系數(shù) K1=～ ，這里取 K1=，則 K1F 鎖 =*=F 鎖，所以注射機(jī)鎖模力滿足要求。使料流平穩(wěn)順利充滿型腔； 2. 流程要短。 （一） 主流道的尺寸計(jì)算： 依據(jù)選擇的注射機(jī)參數(shù)部分尺寸（單位： mm）得： 噴嘴直徑為 Φ 4； 主流道小端直徑 d=注射機(jī)噴嘴直徑 +（ ） =； 主流道球面半徑 SR=噴嘴球面半徑 +（ 12） =18+2=20； 球面 配合高度 h=5（一般為 35mm）； 主流道錐角 a=4176。小批量生產(chǎn)議案不需要用導(dǎo)套，而是導(dǎo)柱直接與模板中的導(dǎo)向孔配合。 （ 5）材料 塑料圓盒模具設(shè)計(jì) 21 采用 20 鋼經(jīng)滲碳淬火或 T8A 鋼經(jīng)淬火處理，本例采用 T8A，熱處理硬度為 5055HRC，抗拉強(qiáng)度為 。 當(dāng)塑料熔體填充型腔時(shí)，必須順序排除型腔及澆注系統(tǒng)內(nèi)的空氣及塑料受熱或凝固禪僧的低分子揮發(fā)氣體。凸模是成型塑件內(nèi)表面的成型零件，通常可以分為整體式和組成式兩種類型。 5 （ 5） 模具 中心距 Lm=（ Lm + Lm * Scp） ? △ /8=（ 120+120*2%） ? 2/8=? 模具型腔側(cè)壁和底板厚度的計(jì)算 按剛度條件計(jì)算 側(cè)壁和型腔底配合處間隙值為： 式中 p—— 型腔內(nèi)單位面積熔體壓力 ； μ —— 型腔材料泊桑比，碳鋼取 ； E—— 型腔材料拉伸彈性模量，鋼彈性模量取 *105Mpa； R—— 型腔外壁半徑； 塑料圓盒模具設(shè)計(jì) 25 r—— 型腔內(nèi)壁半徑。支承板連接用螺釘緊固； 3. 墊塊：其作用是使動(dòng)模支承板與動(dòng)模座板之間形成用于推出機(jī)構(gòu)運(yùn)動(dòng)空間和調(diào)節(jié)模具總高度以適應(yīng)成型設(shè)備上模具安裝空間對(duì)模具總高的要求。 脫模力的計(jì)算 該制件為圓環(huán)形截面，脫模力計(jì)算公式為 122 ( ta n ) 0 .1(1 )rE S L fFAKK??? ????? 式中 r—— 型芯平均半徑 r=62mm K2—— 無(wú)量綱系數(shù)，其值隨 f和 φ 而異，查表得， K2= K1—— 無(wú)量綱系數(shù)，其值隨λ和 φ 而異，查表得， K1= S—— 塑料平均成型收縮率 S=2% E—— 塑料的彈性模量， MPa，查表得 E=1500MPa L—— 塑件對(duì)型芯的包容長(zhǎng)度， mm， L= 塑料圓盒模具設(shè)計(jì) 30 f—— 塑件與型芯之間的摩擦因數(shù)， f= φ —— 模具型芯的脫模斜度， φ =1176。冷卻管道的直徑與間距直接影響模溫分布。故設(shè)計(jì)冷卻水道為環(huán)型腔的形似。 雖然是在選定成型材料、成型設(shè)備時(shí)，在預(yù)想的工藝條件下進(jìn)行模 具設(shè)計(jì)，但是人們的認(rèn)識(shí)往往是不完善的，因此必須在模具加工完成以后，進(jìn)行試模試驗(yàn)，看成型的制件質(zhì)量如何。 塑料圓盒模具設(shè)計(jì) 33 總結(jié) 經(jīng)過(guò)一個(gè)多月的時(shí)間，本人已完成本次畢業(yè)設(shè)計(jì)任務(wù)書要求做的主要內(nèi)容和要求，有圓盒注射模的模具結(jié)構(gòu)和工藝設(shè)計(jì)。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has bined contemporary musical elements with folk songs of the region. Haimu, a 25yearold khoomei (a local variant of overtone singing) singer, joined the troupe three years ago. Along with a sixmember band, he performs fast songs and soft ones that he writes－ all while playing the horsehead fiddle.Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk music of Inner Mongolia is the root, he says. Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled. The first round of spring auction season in Beijing ended last week, but it failed to create much spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sa le rate showed a downturn this year. In the ―Grand View: Chinese Painting Highlight‖ session at China Guardian 2021 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched million yuan, an unexpected high in recent years. However, the trading volume fells to billion yuan from billion yuan in the same period the year before. The Huangchen 2021 Spring Auctions, which recorded million yuan in total sales, experienced the same. The section number went down to 5 from 12 pared to last year. According to expert Shao Jianwu, the art market did not attract much excitement this year due to the booming stock market and the persistent problems of fery and fake deals. The two pieces of Chinese painting notched up high price this spring due to their own value not due to a revival in the market. The successful transaction of two works with a hammer price of more than 100 million yuan once again confirms that valuable and rare works of high quality always earn the longlasting high price. Chinese painting and calligraphy is still the pillar of the market. However, the overall sales rate has dropped slightly, which reflects the demand for the ordinary auction goods has weakened,‖ said the president of China Guardian’s Hu Yanyan. Besides, the entry of new buyers also makes certain changes to the direction of purchasing. In a word, the overall market trend is very unpredictable. Although China Guardian 2021 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out of the predicament. We still have to wait for the big economic boom to invigorate the art market.‖ Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2021 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modificati