【正文】 頁 共 23 頁 deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而窮盡我們的一生，又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經(jīng)到了尾聲。s 21 win. Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。 五、模具的開模過程 塑料制件的上側(cè)有通孔 ,下側(cè)有凹凸 ,這樣 , 上側(cè)就需用帶有側(cè)型芯的側(cè)型芯滑塊成型 , 下側(cè)用側(cè)型腔滑塊成型 .斜導(dǎo)柱通過定模板成型定模座板上 .開模時(shí) ,塑件包在 凸模上隨動(dòng)模部分一起向左移動(dòng) ,在斜導(dǎo)柱的作用下側(cè)型芯滑塊和側(cè)型腔滑塊隨推件板后退的同時(shí) ,在推件板的導(dǎo)滑槽內(nèi)分別向上側(cè)和下側(cè)移動(dòng) ,于是側(cè)型心和側(cè)型腔逐漸脫離塑件 ,直至斜導(dǎo)柱分別與兩滑塊脫離 ,側(cè)向抽芯和分型才結(jié)束 .為了合模時(shí)斜導(dǎo)柱能準(zhǔn)確的插入滑塊上的斜導(dǎo)孔中 ,在滑塊脫離在滑塊脫離斜導(dǎo)柱時(shí)要設(shè)置滑塊的定8 Sin10o 南昌理工學(xué)院模具設(shè)計(jì)與制造專業(yè)畢業(yè)論文 第 21 頁 共 23 頁 距限位裝置 .在壓縮彈簧的作用下 ,側(cè)型芯滑塊在抽芯結(jié)束的同時(shí)緊靠擋塊而定位 ,側(cè)型腔滑塊在側(cè)向分型結(jié)束時(shí)由于自身的重力定位于擋塊上 .動(dòng)模部分繼續(xù)向左移動(dòng) ,直至推出機(jī)構(gòu)動(dòng)作 ,推桿推動(dòng)推件板把塑件從凸模上拖下來 .合模時(shí) ,滑 塊靠斜導(dǎo)柱復(fù)位 ,在注射時(shí) ,滑塊分別由楔緊塊鎖緊 ,以使其處于正確的成型位置而不因受塑料熔體壓力的作用向兩側(cè)松動(dòng) . 致 謝 在羅偉 .楊述火兩位導(dǎo)師的悉心指導(dǎo)下，設(shè)計(jì)參照了相關(guān)實(shí)踐資料，并經(jīng)過精心的設(shè)計(jì)與計(jì)算，所設(shè)計(jì)的塑件圖能滿足使用要求，塑模設(shè)計(jì)強(qiáng)度可靠，可滿足塑件的生產(chǎn)要求，并確保安全，為此設(shè)計(jì)完全用于生產(chǎn)取得預(yù)定的效果。 由塑件圖的尺寸可計(jì)算 A1=π r2=（ 80/2） 2 =5026mm2 由于 A2與 A1重合，所以不再計(jì)算 由《塑料成型工藝與模具設(shè)計(jì)》表 41 查得 所選注射機(jī)的注射壓力 f=120MPa 注射機(jī)的額定鎖模力 F=900KN 所以由以上計(jì)算可知， 1 5026 120 80% 1/1000=＜ F=900KN 南昌理工學(xué)院模具設(shè)計(jì)與制造專業(yè)畢業(yè)論文 第 20 頁 共 23 頁 因此所選注射機(jī)的鎖模力符合要求。如果型腔內(nèi)因各種原因而產(chǎn)生的氣體不被排除干凈，一方面將會(huì)在塑體上形成氣泡，接縫，表面輪廓不清及充填缺料等成型缺陷，另一方面氣體受壓，體積縮小而產(chǎn)生高溫會(huì)導(dǎo)致塑件局部碳化或燒焦，同時(shí)積存的氣體還會(huì)產(chǎn)生反向壓力而降低充模速度，因此設(shè)計(jì)型腔時(shí)必須考慮排氣問題。 由本模具的裝配圖可知，設(shè)置兩個(gè)冷地裝置即可滿足要求。 由本塑件圖可知 斜導(dǎo)柱水平段長 =型腔板厚度 +定模板厚度 （ 2～ 3） mm 斜段長 =L 工 作 +（ 5～ 10） mm 而 L 工作 = = =12mm L 總長度 =d2/2tgα +h/cosα +α /2 tgα +s/sinα +10 =15/2 tg15○ +40/cos15○ +10/2 tg15○ +12+10 =+12 =85 mm h=模座厚度 +凹模厚度 =20+20 =40 mm L 總 1= +40/+5 +12+0 =73 mm 抽芯距 S Sinα 3 Sin15 南昌理工學(xué)院模具設(shè)計(jì)與制造專業(yè)畢業(yè)論文 第 17 頁 共 23 頁 加熱、冷卻裝置的位置、形式 當(dāng) 注射成型工藝要求模具溫度在 80℃以上時(shí)，模具中必須設(shè)置