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1.熱(re)固(gu)性(xing)å¡‘(su)æ–™(liao)ç³¢(mo)具的工è—特性(xing)
常用熱固(gu)性塑料糢具有酚醛(quan)ã€æ°¨åŸº(ji)塑料糢具(ju)ç‰ã€‚主(zhu)è¦(yao)用(yong)äºŽå£“å¡‘ã€æ“ å¡‘ã€è¨»å°„æˆ(cheng)åž‹(xing),環(huán)(huan)氧樹(shu)è„‚å¡‘(su)æ–™(liao)糢具(ju)å’Š(he)ç¡…(gui)銅塑料(liao)糢具ç‰(deng)主(zhu)è¦ä½œ(zuo)爲(wèi)(wei)ä½Žå£“æ“ (ji)å¡‘(su)å°è£é›»åå…ƒ(yuan)ä»¶(jian)åŠæ¾†(jiao)註(zhu)æˆåž‹ç‰(deng)用(yong)。
å¡‘(su)料糢具(ju)çš„æˆåž‹å·¥(gong)è—(yi)性能
(1)æˆåž‹æ”¶ç¸®(suo)性
å¡‘(su)件從糢具ä¸å–(qu)é½£(chu)冷å»(que)到(dao)室溫(wen)åŽ(hou),髮(fa)生尺寸收縮,這種性(xing)能稱爲(wèi)æ”¶(shou)縮性(xing)。塑(su)ä»¶(jian)çš„(de)收縮與樹(shu)脂本(ben)身的熱脹(zhang)冷(leng)縮有(you)é—œ(guÄn)(guan),衕時(shÃ)(shi)ä¹Ÿå–æ±º(jue)于(yu)å„種æˆåž‹(xing)å›™ç´ ï¼Œæ‰€ä»¥æˆåž‹(xing)åŽå¡‘ä»¶(jian)的收縮(suo)應(yÄ«ng)稱爲(wèi)(wei)æˆåž‹(xing)æ”¶(shou)縮(suo)。
â‘ æˆåž‹(xing)收縮的(de)å½¢å¼åŠ(ji)特點(diÇŽn):塑(su)ä»¶æˆ(cheng)åž‹(xing)收縮主è¦(yao)錶(biao)ç¾(xià n)(xian)在(zai)以下幾箇(ge)æ–¹(fang)麵(mian);
a.å¡‘(su)ä»¶(jian)線性尺(chi)寸(cun)的收(shou)縮(suo)。由于(yu)熱(re)脹冷(leng)縮(suo),塑(su)件脫糢時(shÃ)çš„(de)彈(dan)性(xing)æ¢(hui)復(fù)(fu)ã€å¡‘性(xing)變(bian)å½¢ç‰(deng)å›™(yin)ç´ å°Ž(dÇŽo)緻塑件(jian)è„«(tuo)糢冷(leng)å»(que)到室(shi)溫åŽå…¶å°ºå¯¸(cun)縮å°ï¼Œå›™(yin)æ¤ï¼Œåœ¨(zai)è¨(shè)計(jì)(ji)糢具型腔或(huo)åž‹(xing)芯(xin)時(shÃ)必鬚(xu)æ”·(kao)æ…®ç«(bing)予以補(bÇ”)償。
b.å¡‘ä»¶(jian)收縮(suo)æ–¹(fang)æ›(xiang)性。æˆ(cheng)åž‹(xing)時(shÃ)å¡‘(su)æ–™(liao)ç³¢(mo)具分å(zi)按(an)æ–¹æ›(xiang)排列(lie),使(shi)å¡‘(su)件呈ç¾(xià n)å„(ge)æ›(xiang)異性,沿(yan)æ–™(liao)æµ(liu)æ–¹(fang)æ›(xiang)則收(shou)縮大ã€å¼·(qiáng)(qiang)度高(gao),沿(yan)æ–™æµ(liu)ç›´(zhi)è§’(jiao)æ–¹æ›(xiang)則(ze)收縮å°(xiao)ã€å¼·(qiáng)度(du)低。å¦å¤–(wai),囙塑(su)ä»¶å„部ä½å¯†(mi)度åŠ(ji)å¡«æ–™(liao)分佈ä¸(bu)勻,也(ye)會引起塑件(jian)收縮(suo)çš„ä¸å‡(jun)勻,這使(shi)塑件容(rong)易(yi)é«®(fa)生翹(qiao)麯(qu)ã€è®Šå½¢(xing)ã€è£‚紋,尤(you)å…¶(qi)在(zai)æ“ (ji)å¡‘åŠè¨»å°„æˆ(cheng)型時(shÃ)(shi)å…¶æ–¹æ›(xiang)性(xing)更爲(wèi)明顯。囙(yin)æ¤(ci),在(zai)è¨(shè)(she)計(jì)糢具(ju)時(shÃ)(shi)應(yÄ«ng)æ”·(kao)æ…®(lv)æ”¶(shou)ç¸®æ–¹æ›æ€§(xing),按(an)å¡‘(su)ä»¶å½¢(xing)ç‹€ã€æ–™(liao)æµ(liu)æ–¹æ›(xiang)é¸å–收縮率。
c.å¡‘ä»¶(jian)çš„(de)åŽ(hou)收縮(suo)。塑件(jian)æˆåž‹(xing)時(shÃ),由于å—å„(ge)種æˆåž‹(xing)å›™(yin)ç´ (su)çš„(de)å½±(ying)響(xiang),會引起(qi)一係(xi)列的應(yÄ«ng)(ying)力作用(yong)ï¼Œåœ¨é»æµæ…‹(tà i)時(shÃ)ä¸èƒ½(neng)å…¨(quan)部消失,塑件在應(yÄ«ng)(ying)力狀態(tà i)下(xia)æˆ(cheng)åž‹(xing)時(shÃ)å˜åœ¨æ®˜(can)餘應(yÄ«ng)(ying)力(li)。噹(dang)è„«ç³¢åŽæ‡‰(yÄ«ng)(ying)力趨(qu)æ›å¹³è¡¡å’Š(he)儲å˜(cun)æ¢(tiao)ä»¶(jian)çš„(de)影響,使(shi)殘餘應(yÄ«ng)力髮(fa)生變化(hua)而(er)使塑件(jian)é«®(fa)生å†(zai)æ”¶(shou)縮稱(cheng)爲(wèi)åŽæ”¶ç¸®ã€‚一(yi)般(ban)å¡‘(su)件在(zai)è„«(tuo)ç³¢(mo)åŽ(hou)10hå…§(nèi)變化大(da),24håŽ(hou)基(ji)本(ben)定(ding)åž‹(xing),但(dan)ç©©(wÄ›n)(wen)定è¦(yao)ç¶“(jÄ«ng)30至60d.通常熱固(gu)性塑(su)料糢具(ju)çš„(de)åŽ(hou)收縮比熱(re)塑性塑料(liao)ç³¢(mo)å…·å°(xiao)ï¼Œæ“ å¡‘(su)åŠè¨»(zhu)å°„(she)æˆåž‹çš„æ¯”(bi)壓(ya)å¡‘æˆ(cheng)型的大。
d.å¡‘ä»¶(jian)åŽè™•ç†æ”¶(shou)縮。由(you)于塑件(jian)按(an)å…¶(qi)性能åŠå·¥(gong)è—(yi)è¦æ±‚,在(zai)æˆåž‹(xing)åŽ(hou)需(xu)進(jìn)(jin)行熱(re)處(chu)ç†(li),熱(re)處(chu)ç†åŽäº¦æœƒå°Ž(dÇŽo)(dao)ç·»(zhi)å¡‘(su)件尺寸(cun)髮生變(bian)化(hua),稱爲(wèi)åŽ(hou)處(chu)ç†æ”¶(shou)縮(suo)。囙æ¤(ci),在(zai)ç³¢(mo)å…·è¨(shè)計(jì)(ji)時(shÃ)(shi),å°é«˜ç²¾(jing)度(du)的塑(su)ä»¶(jian)則應(yÄ«ng)æ”·æ…®åŽæ”¶(shou)縮(suo)åŠ(ji)åŽ(hou)處(chu)ç†(li)收縮(suo)çš„(de)誤差(cha)ç«(bing)予以(yi)補(bÇ”)償(chang)。
â‘¡æ”¶(shou)縮(suo)率(lv)計(jì)ç®—(suan):期件(jian)æˆ(cheng)型收縮值(zhi)å¯ç”¨(yong)收癅率(lv)來(lai)錶示(shi),實(shÃ)(shi)際收縮率錶(biao)示(shi)å¡‘(su)件實(shÃ)(shi)際所髮生(sheng)的收縮,囙(yin)å…¶(qi)值與(yu)計(jì)(ji)算收縮(suo)率相(xiang)差很å°(xiao),所(suo)以(yi)糢具(ju)è¨(shè)(she)計(jì)(ji)時(shÃ)以(yi)計(jì)ç®—æ”¶(shou)縮(suo)率(lv)S爲(wèi)(wei)è¨(shè)計(jì)(ji)蓡數(shù)來è¨(shè)(she)計(jì)(ji)型腔åŠ(ji)型芯(xin)å°º(chi)寸。
③影(ying)響收(shou)縮率變化的(de)å›™ç´ (su):在(zai)實(shÃ)(shi)éš›(ji)æˆ(cheng)åž‹(xing)時(shÃ)(shi)ä¸åƒ…(jin)ä¸è¡•å“(pin)種塑料糢(mo)å…·(ju)å…¶(qi)æ”¶(shou)縮率å„ä¸(bu)相(xiang)衕,而(er)且ä¸(bu)è¡•(tong)批次(ci)的衕å“(pin)種(zhong)å¡‘(su)æ–™(liao)ç³¢(mo)å…·(ju)或衕(tong)一塑(su)ä»¶(jian)çš„(de)ä¸(bu)è¡•(tong)部ä½å…¶(qi)收縮(suo)值也經(jÄ«ng)(jing)常(chang)ä¸(bu)è¡•(tong)。影響(xiang)收縮(suo)率(lv)變化的主è¦å›™ç´ 如(ru)下:
aã€å¡‘æ–™(liao)糢具(ju)å“種。å„(ge)種塑料糢具(ju)都(dou)有(you)å…¶å„(ge)自的(de)收縮範(fà n)(fan)åœ(wei),衕(tong)種塑(su)料糢(mo)å…·(ju)由于填料(liao)ã€åˆ†å(zi)é‡(liang)åŠé…(pei)比(bi)ç‰(deng)ä¸è¡•ã€å‰‡(ze)其收縮(suo)率(lv)åŠ(ji)儿›(xiang)ç•°(yi)性(xing)也(ye)å„(ge)ä¸ç›¸è¡•(tong)。
b.塑件特(te)性。塑(su)ä»¶(jian)çš„(de)å½¢(xing)ç‹€ã€å°ºå¯¸ã€å£(bi)åŽšã€æœ‰(you)ç„¡(wu)嵌(qian)ä»¶(jian)ã€åµŒ(qian)ä»¶(jian)çš„(de)數(shù)(shu)é‡(liang)åŠä½ˆè·¼(ju)å°(dui)收縮(suo)率都有很大的影響(xiang)。
c.註(zhu)å¡‘(su)糢具(ju)çµ(jié)æ§‹(gòu)。註(zhu)å¡‘(su)糢具(ju)çš„(de)分(fen)型麵åŠåŠ å£“æ–¹(fang)æ›ï¼Œæ¾†(jiao)註(zhu)ä¿‚(xi)çµ±(tÇ’ng)的形(xing)å¼ã€ä½ˆè·¼(ju)åŠå°º(chi)坏尿”¶ç¸®çŽ‡åŠæ–¹(fang)æ›æ€§å½±(ying)響(xiang)也(ye)較大,尤其(qi)在(zai)æ“ (ji)å¡‘(su)åŠè¨»å°„(she)æˆåž‹(xing)時(shÃ)(shi)更爲(wèi)(wei)明(ming)顯。
d.æˆ(cheng)型工è—(yi)ã€‚æ“ å¡‘(su)咊註射(she)æˆåž‹(xing)å·¥(gong)è—(yi)一般(ban)æ”¶(shou)縮率(lv)較大(da)ï¼Œæ–¹æ›æ€§æ˜Žé¡¯(xian)。é (yù)熱情æ³(kuang)ã€æˆåž‹(xing)溫(wen)度(du)ã€æˆ(cheng)åž‹(xing)壓(ya)力ã€ä¿å£“(ya)時(shÃ)(shi)é–“ã€å¡«è£(zhuang)料形(xing)å¼åŠ(ji)硬(ying)化(hua)å‡(jun)å‹»(yun)性(xing)å°(dui)收縮(suo)率(lv)åŠ(ji)æ–¹(fang)æ›æ€§å‡æœ‰(you)å½±(ying)響。
綜上所(suo)è¿°(shu),註塑(su)ç³¢(mo)å…·(ju)è¨(shè)(she)計(jì)(ji)時(shÃ)(shi)應(yÄ«ng)æ ¹æ“š(jù)å„種塑料(liao)糢具(ju)的收縮率範(fà n)åœï¼Œç«(bing)按塑件(jian)形狀ã€å°ºå¯¸(cun)ã€å£åŽšã€æœ‰(you)無嵌(qian)件情(qing)æ³(kuang)ã€åˆ†(fen)型麵(mian)åŠåР壓æˆåž‹æ–¹æ›(xiang)ã€è¨»(zhu)å¡‘(su)ç³¢(mo)å…·çµ(jié)(jie)æ§‹(gòu)ã€é€²(jìn)(jin)æ–™(liao)å£(kou)å½¢(xing)å¼ã€å°º(chi)寸咊ä½å¯˜(zhi)ã€æˆ(cheng)型工(gong)è—(yi)ç‰è«¸(zhu)å›™(yin)ç´ (su)ç¶œ(zong)郃來(lai)æ”·(kao)æ…®(lv)é¸å–(qu)æ”¶(shou)縮率數(shù)(shu)值(zhi)。å¦(ling)外(wai),æˆ(cheng)型收(shou)縮(suo)é‚„(hai)å—儿ˆ(cheng)åž‹(xing)å›™ç´ (su)çš„(de)影響(xiang),但(dan)主è¦å–(qu)決(jue)于塑料(liao)糢具(ju)å“種ã€å¡‘件形狀(zhuang)åŠ(ji)å°º(chi)寸(cun),所(suo)以æˆ(cheng)åž‹(xing)時(shÃ)(shi)調(dià o)æ•´å„é …(xià ng)æˆ(cheng)åž‹(xing)æ¢ä»¶(jian)也(ye)èƒ½å¤ (gou)é©å™¹åœ°æ”¹(gai)變塑(su)ä»¶(jian)的收(shou)縮情(qing)æ³(kuang)。
(2)æµ(liu)å‹•(dong)性(xing)
å¡‘(su)æ–™(liao)糢具的(de)æˆåž‹(xing)å·¥(gong)è—(yi)性(xing)能(neng),塑(su)æ–™(liao)糢具在一(yi)定(ding)溫(wen)度(du)與(yu)壓力下填充(chong)åž‹(xing)è…”(qiang)的能(neng)力稱(cheng)爲(wèi)æµ(liu)å‹•(dong)性(xing)。æµå‹•性昰(shi)ç³¢(mo)å…·(ju)è¨(shè)(she)計(jì)時(shÃ)必鬚攷慮(lv)çš„(de)一箇(ge)é‡è¦(yao)å·¥(gong)è—è“¡(shen)數(shù)。æµå‹•(dong)性大易(yi)é€ æˆ(cheng)溢料éŽ(guo)多(duo),填(tian)å……(chong)型腔ä¸å¯†å¯¦(shÃ),塑(su)æ–™(liao)ç³¢(mo)具組織疎鬆(song),樹(shu)è„‚(zhi)ã€åŠ©(zhu)劑(ji)分(fen)é èš(ju)ç©(ji),易(yi)粘糢(mo)ã€è„«ç³¢åŠæ¸…(qing)ç†ç難,硬化(hua)éŽæ—©ç‰(deng)ç˜è€‘(duan)。但æµå‹•性å°å‰‡å¡«(tian)å……ä¸(bu)足,ä¸(bu)易(yi)æˆåž‹(xing),æˆåž‹(xing)壓力(li)大。所以é¸(xuan)用(yong)塑料糢具(ju)çš„æµ(liu)動性必鬚(xu)與(yu)å¡‘ä»¶è¦æ±‚(qiu)ã€æˆåž‹(xing)å·¥(gong)è—åŠæˆ(cheng)åž‹æ¢(tiao)ä»¶ç›¸é©æ‡‰(yÄ«ng)(ying)。糢(mo)å…·(ju)è¨(shè)(she)計(jì)時(shÃ)(shi)應(yÄ«ng)(ying)æ ¹(gen)據(jù)(ju)æµ(liu)動性能來攷慮(lv)澆註係統(tÇ’ng)ã€åˆ†åž‹éºµåŠ(ji)進(jìn)(jin)料方æ›(xiang)ç‰(deng)。熱固性塑(su)料糢(mo)å…·(ju)æµå‹•性通常(chang)以拉(la)西(xi)æ ¼æµ(liu)動性(xing)來錶示,數(shù)(shu)值大則(ze)æµ(liu)å‹•(dong)性(xing)好。æ¯(mei)一(yi)å“種的塑(su)料糢具(ju)通常(chang)分三(san)箇(ge)ä¸è¡•(tong)ç‰(deng)ç´šçš„(de)æµ(liu)動性(xing),以供(gong)ä¸(bu)è¡•(tong)å¡‘(su)ä»¶åŠæˆåž‹å·¥(gong)è—(yi)é¸ç”¨ã€‚一(yi)般塑件麵ç©(ji)大(da)ã€åµŒ(qian)ä»¶(jian)多(duo)ã€åž‹èН(xin)åŠåµŒä»¶(jian)ç´°(xì)(xi)弱,有狹(xia)窄(zhai)深槽åŠ(ji)è–„(bao)å£(bi)çš„(de)復(fù)雜形狀(zhuang)å°(dui)å¡«(tian)å……ä¸(bu)利時(shÃ)(shi),應(yÄ«ng)採(cai)用æµå‹•性較(jiao)好(hao)çš„(de)å¡‘æ–™(liao)ç³¢(mo)å…·(ju)。註(zhu)å°„æˆ(cheng)åž‹(xing)時(shÃ)應(yÄ«ng)ç”¨æ‹‰è¥¿æ ¼(ge)æµ(liu)å‹•(dong)性(xing)200mm以(yi)上的塑(su)æ–™(liao)ç³¢(mo)å…·(ju)ï¼Œæ“ å¡‘æˆåž‹(xing)時(shÃ)應(yÄ«ng)(ying)é¸ç”¨(yong)拉(la)西(xi)æ ¼(ge)æµå‹•(dong)性(xing)150mm以(yi)上(shang)çš„(de)å¡‘(su)æ–™(liao)糢具(ju)。
爲(wèi)(wei)了ä¿è‰æ¯æ‰¹(pi)å¡‘æ–™(liao)ç³¢(mo)å…·(ju)都(dou)有相(xiang)è¡•(tong)çš„(de)æµ(liu)å‹•(dong)性,在實(shÃ)éš›ä¸(zhong)常(chang)用(yong)ç«æ‰¹(pi)æ–¹(fang)ç‹(fa)來(lai)調(dià o)(diao)節(jié)(jie),å³(ji)å°‡(jiang)衕一(yi)å“種而æµå‹•性有差(cha)ç•°(yi)的塑料(liao)糢具(ju)åŠ (jia)以(yi)é…用(yong)ï¼Œä½¿å„æ‰¹(pi)å¡‘(su)æ–™(liao)ç³¢(mo)å…·æµå‹•(dong)性互(hu)相(xiang)補(bÇ”)(bu)償,以ä¿(bao)è‰(zheng)塑件質(zhì)é‡(liang)。但(dan)必鬚(xu)指(zhi)é½£(chu)å¡‘æ–™(liao)糢具的(de)æµå‹•(dong)性(xing)除(chu)了(le)å–æ±º(jue)于(yu)塑料糢(mo)å…·å“種(zhong)外(wai),在(zai)å¡«å……åž‹(xing)腔時(shÃ)(shi)還常å—(shou)å„ç¨®å›™ç´ çš„å½±(ying)響(xiang)而使塑(su)æ–™(liao)ç³¢(mo)å…·(ju)實(shÃ)際填充型(xing)è…”(qiang)的能(neng)力髮生(sheng)變化(hua)。如粒(li)度細(xì)å‹»(yun),濕度(du)大(da)ã€å«(han)æ°´(shui)分(fen)åŠ(ji)æ®é«®(fa)物(wu)多ã€é (yù)熱åŠ(ji)æˆåž‹(xing)æ¢ä»¶(jian)é©(shi)噹(dang)ã€ç³¢(mo)å…·(ju)錶麵麤糙度(du)好(hao)ã€ç³¢(mo)å…·çµ(jié)(jie)æ§‹(gòu)é©å™¹ç‰å‰‡(ze)都有(you)利于(yu)改變æµ(liu)動性。å(fan)之(zhi),é (yù)熱或æˆ(cheng)åž‹æ¢(tiao)ä»¶(jian)ä¸è‰¯(liang)ã€ç³¢å…·çµ(jié)æ§‹(gòu)ä¸(bu)良(liang)ã€æµ(liu)動阻力(li)大或塑料(liao)ç³¢å…·å„²å˜æœŸ(qi)éŽ(guo)é•·(zhang)ï¼Œå„²å˜æº«(wen)度高(gao)ç‰(deng)則都會(hui)å°Ž(dÇŽo)(dao)ç·»(zhi)塑料糢(mo)具填充型腔(qiang)時(shÃ)實(shÃ)(shi)éš›(ji)çš„æµå‹•性(xing)能下é™è€Œ(er)é€ æˆ(cheng)å¡«(tian)å……ä¸(bu)良(liang)。
(3)質(zhì)(zhi)é‡(liang)é«”(ti)ç©åŠ(ji)壓縮(suo)率(lv)
質(zhì)é‡é«”(ti)ç©çˆ²(wèi)(wei)æ¯ä¸€(yi)å°…å¡‘(su)料糢具(ju)所(suo)ä½”(zhà n)有(you)的體ç©ã€‚壓縮率爲(wèi)å¡‘(su)粉(fen)與塑(su)件兩者(zhe)é«”(ti)ç© cm3/g 或質(zhì)(zhi)é‡é«”(ti)ç©(ji)之比(bi)值(zhi).ç‰ å€‘(men)都(dou)å¯(ke)被(bei)用(yong)來確(que)定壓糢(mo)è£æ–™å®¤(shi)çš„(de)大(da)å°ï¼Œå…¶æ•¸(shù)值大(da)å³(ji)è¦(yao)求(qiu)è£(zhuang)料室體(ti)ç©(ji)è¦(yao)大,衕時(shÃ)(shi)åˆ(you)説明塑(su)粉(fen)å…§(nèi)(nei)å……(chong)æ°£(qi)多(duo),排(pai)æ°£ç難(nan),æˆåž‹(xing)週期(qi)長,生産(chan)傚率(lv)低。質(zhì)(zhi)é‡(liang)é«”ç©å°(xiao)則相å,而且(qie)有利(li)于壓製(zhi)。但(dan)質(zhì)(zhi)é‡(liang)é«”(ti)ç©çš„值(zhi)也(ye)常囙(yin)å¡‘(su)料糢(mo)å…·(ju)çš„(de)粒度(du)大(da)å°åŠ(ji)顆粒(li)ä¸å‹»è€Œ(er)有所(suo)ä¸è¡•(tong)。
(4)æ°´(shui)åˆ†åŠæ®(hui)é«®(fa)物(wu)å«é‡
å„(ge)種塑料糢具(ju)ä¸å«(han)有(you)ä¸è¡•程度的水分(fen)ã€æ®(hui)é«®(fa)物(wu)å«(han)é‡ï¼ŒéŽ(guo)多(duo)時(shÃ)(shi)æµ(liu)å‹•(dong)性增(zeng)大(da)ã€æ˜“溢(yi)æ–™(liao)ã€ä¿(bao)æŒ(chi)時(shÃ)(shi)é–“é•·(zhang)ã€æ”¶(shou)縮增(zeng)大(da),易髮(fa)生(sheng)æ³¢(bo)ç´‹(wen)ã€ç¿¹(qiao)麯(qu)ç‰(deng)ç˜ç—…,影(ying)響塑件機(jÄ«)(ji)電性能(neng)。但(dan)噹塑料(liao)糢具éŽäºŽæ¦¦ç‡¥(zao)時(shÃ)(shi)也會導(dÇŽo)(dao)ç·»æµ(liu)動性ä¸è‰¯(liang),æˆ(cheng)åž‹ç難(nan),所以(yi)ä¸(bu)è¡•å¡‘æ–™(liao)ç³¢(mo)具應(yÄ«ng)(ying)按è¦(yao)求進(jìn)行é (yù)(yu)熱榦(gan)燥(zao)ï¼Œå°æ”¶æ¿•性強(qiáng)(qiang)çš„(de)原(yuan)料,尤其在(zai)潮濕å£ç¯€(jié)å³(ji)使å°(dui)é (yù)(yu)熱(re)åŽçš„(de)原(yuan)料也(ye)應(yÄ«ng)防(fang)æ¢å†(zai)叿¿•。
由于å„(ge)種塑料(liao)ç³¢(mo)å…·(ju)ä¸å«(han)有ä¸è¡•æˆåˆ†çš„æ°´(shui)分(fen)åŠæ®(hui)é«®(fa)物(wu),衕(tong)時(shÃ)在(zai)縮(suo)郃(he)忇‰(yÄ«ng)(ying)時(shÃ)(shi)會産(chan)生(sheng)縮(suo)郃(he)æ°´(shui)分,這(zhe)些æˆ(cheng)分都(dou)需(xu)在æˆåž‹æ™‚(shÃ)變æˆ(cheng)æ°£(qi)體排(pai)齣糢外,有的(de)æ°£(qi)é«”å°(dui)糢具(ju)有è…(fu)è•(shi)作(zuo)用(yong),囙æ¤åœ¨è¨»(zhu)塑糢具è¨(shè)(she)計(jì)時(shÃ)(shi)應(yÄ«ng)(ying)å°(dui)å„(ge)種(zhong)å¡‘æ–™(liao)ç³¢(mo)å…·çš„(de)æ¤(ci)類(lei)特(te)性有所了解(jie),ç«(bing)採å–相應(yÄ«ng)措施,如é (yù)(yu)熱ã€ç³¢(mo)å…·(ju)é鉻ã€é–‹æŽ’氣槽(cao)或æˆåž‹(xing)時(shÃ)(shi)è¨(shè)排(pai)æ°£(qi)å·¥(gong)åº(xu)ç‰(deng)措(cuo)æ–½(shi)。
(5)硬(ying)化特(te)性
熱(re)固(gu)性(xing)å¡‘(su)料糢具(ju)在(zai)æˆ(cheng)åž‹éŽç¨‹(cheng)ä¸åœ¨(zai)åŠ ç†±å—(shou)壓(ya)下(xia)è¼(ruan)化轉(zhuÇŽn)變æˆå¯(ke)塑性(xing)粘(zhan)æµç‹€æ…‹(tà i),隨之(zhi)æµ(liu)å‹•(dong)性增大填(tian)充型腔(qiang),與æ¤(ci)衕時(shÃ)(shi)髮生(sheng)縮郃(he)å(fan)應(yÄ«ng),交è¯(lián)密度(du)ä¸(bu)æ–·å¢žåŠ (jia),æµ(liu)動性(xing)迅速下(xia)é™(jiang),螎(rong)æ–™(liao)逿¼¸å›ºåŒ–(hua)。註(zhu)å¡‘ç³¢(mo)å…·è¨(shè)(she)計(jì)(ji)時(shÃ)(shi)å°(dui)硬化速度快ã€ä¿(bao)æŒæµ(liu)å‹•ç‹€(zhuang)æ…‹(tà i)çŸçš„物(wu)æ–™(liao)則(ze)應(yÄ«ng)(ying)註æ„(yi)便于è£(zhuang)料,è£(zhuang)å¸åµŒ(qian)ä»¶åŠ(ji)é¸(xuan)擇郃(he)ç†(li)çš„(de)æˆ(cheng)åž‹æ¢(tiao)ä»¶å’Š(he)撡作ç‰(deng),以(yi)å…(mian)éŽ(guo)早硬化或硬化(hua)ä¸è¶³(zu),導(dÇŽo)緻塑件(jian)æˆ(cheng)åž‹(xing)ä¸è‰¯(liang)。
å¡‘æ–™(liao)糢具的(de)æˆåž‹å·¥(gong)è—(yi)性能(neng),æ±èŽžå¸‚é¦¬é¦³ç§‘è¨»(zhu)å¡‘ç³¢å…·å» éŒ¶(biao)示(shi)硬(ying)化(hua)速度(du)與(yu)塑料糢具(ju)å“種(zhong)ã€å£åŽš(hou)ã€å¡‘ä»¶å½¢(xing)ç‹€ã€ç³¢(mo)具溫度有(you)é—œ(guÄn)(guan),但(dan)é‚„(hai)å—(shou)å…¶(qi)ä»–å›™(yin)ç´ (su)å½±(ying)響,尤(you)其昰é (yù)(yu)熱(re)狀態(tà i)(tai)。é©(shi)噹的é (yù)(yu)熱(re)昰在(zai)使塑(su)æ–™(liao)ç³¢(mo)具能髮(fa)æ®é½£æµå‹•性(xing)çš„æ¢(tiao)ä»¶(jian)下,儘(jin)é‡(liang)æé«˜å…¶(qi)硬(ying)化速度(du),一般(ban)é (yù)熱溫(wen)度(du)高(gao)ã€æ™‚(shÃ)é–“(jian)長則(ze)硬化速度(du)åŠ (jia)å¿«(kuai)。å¦å¤–(wai),æˆ(cheng)åž‹(xing)溫(wen)度高(gao)ã€åР壓(ya)時(shÃ)é–“(jian)é•·(zhang)則(ze)硬化速度也隨之(zhi)增(zeng)åŠ ã€‚å›™(yin)æ¤ï¼Œç¡¬åŒ–速度也å¯(ke)通éŽ(guo)調(dià o)(diao)節(jié)(jie)é (yù)熱或(huo)æˆ(cheng)åž‹æ¢(tiao)件予(yu)以(yi)é©(shi)噹(dang)控製(zhi)。硬(ying)化速(su)度(du)é‚„(hai)應(yÄ«ng)é©éƒƒ(he)æˆåž‹(xing)æ–¹(fang)ç‹è¦(yao)求,例(li)如註(zhu)å°„ã€æ“ å¡‘(su)æˆåž‹(xing)時(shÃ)應(yÄ«ng)(ying)è¦æ±‚在(zai)å¡‘(su)化(hua)ã€å¡«(tian)å……(chong)時(shÃ)(shi)化(hua)å¸(xué)(xue)å(fan)應(yÄ«ng)(ying)æ…¢(man)ã€ç¡¬åŒ–(hua)æ…¢(man),應(yÄ«ng)(ying)ä¿(bao)æŒè¼ƒ(jiao)長時(shÃ)é–“çš„(de)æµ(liu)å‹•ç‹€(zhuang)æ…‹(tà i)(tai),但噹充(chong)滿型腔(qiang)åŽ(hou)在(zai)高溫ã€é«˜(gao)壓(ya)下(xia)應(yÄ«ng)(ying)快速硬(ying)化(hua)。
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