{"id":11853,"date":"2022-08-04T09:49:00","date_gmt":"2022-08-04T01:49:00","guid":{"rendered":"https:\/\/zetarmold.com\/?p=11853"},"modified":"2026-04-09T08:29:28","modified_gmt":"2026-04-09T00:29:28","slug":"ic-gerilimli-plastik-enjeksiyon-kaliplama","status":"publish","type":"post","link":"https:\/\/zetarmold.com\/tr\/ic-gerilimli-plastik-enjeksiyon-kaliplama\/","title":{"rendered":"Plastik Enjeksiyon Kal\u0131plamada \u0130\u00e7 Gerilmenin Neden Analizi"},"content":{"rendered":"

\u0130\u00e7 stres \u00fcretimi<\/span><\/h2>\n

\u0130\u00e7inde enjeksiyon kal\u0131b\u0131<\/a>ed products, the local stress state is different in each place, and the degree of product deformation will be determined by the residual stress distribution. If the product is cooled. If there is a temperature gradient, this kind of stress will develop, so this kind of stress is also called “molding stress”.<\/p>\n

A\u015fa\u011f\u0131dakilerde iki t\u00fcr i\u00e7 gerilim vard\u0131r enjeksiyon kal\u0131pl\u0131 par\u00e7alar<\/a>Bunlardan biri enjeksiyon kal\u0131pl\u0131 \u00fcr\u00fcnlerin kal\u0131plama gerilimi, di\u011feri ise s\u0131cakl\u0131k kal\u0131nt\u0131 gerilmeleridir. Eriyik kal\u0131ba daha d\u00fc\u015f\u00fck bir s\u0131cakl\u0131kta girdi\u011finde, bo\u015fluk duvar\u0131n\u0131n yak\u0131n\u0131ndaki eriyik h\u0131zla so\u011fur ve kat\u0131la\u015f\u0131r, b\u00f6ylece molek\u00fcler zincir segmentleri \"donar\".<\/p>\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n<\/div>\n

Kat\u0131la\u015fm\u0131\u015f polimer tabakas\u0131n\u0131n zay\u0131f art\u0131k termal gerilme iletkenli\u011fi nedeniyle, \u00fcr\u00fcn\u00fcn kal\u0131nl\u0131k y\u00f6n\u00fcnde b\u00fcy\u00fck bir s\u0131cakl\u0131k gradyan\u0131 olu\u015fur.<\/p>\n

The heart of the product solidifies rather slowly, so that when the gate is closed, the melting unit in the center of the product has not yet solidified, and the injection molding machine is unable to compensate for the cooling shrinkage at this time.<\/p>\n

B\u00f6ylece, \u00fcr\u00fcn\u00fcn i\u00e7 b\u00fcz\u00fclmesi sert deri tabakas\u0131n\u0131n hareketinin tersi y\u00f6n\u00fcndedir; y\u00fczey tabakas\u0131 statik s\u0131k\u0131\u015ft\u0131rma i\u00e7indeyken \u00e7ekirdek statik gerilim i\u00e7indedir.<\/p>\n

Eriyik dolum ak\u0131\u015f\u0131nda, gerilmenin neden oldu\u011fu hacimsel b\u00fcz\u00fclme etkisine ek olarak. Yolluk ve kapak \u00e7\u0131k\u0131\u015f\u0131n\u0131n genle\u015fme etkisinin neden oldu\u011fu gerilmeler de vard\u0131r; ilk etki eriyik ak\u0131\u015f y\u00f6n\u00fcyle ilgili gerilmelere neden olurken, ikincisi \u00e7\u0131k\u0131\u015f genle\u015fme etkisi nedeniyle ak\u0131\u015fa dik y\u00f6nde gerilmelere neden olacakt\u0131r.<\/p>\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n<\/div>\n

Stresi etkileyen s\u00fcre\u00e7 fakt\u00f6rleri<\/span><\/h2>\n

H\u0131zl\u0131 so\u011futma ko\u015fullar\u0131nda, oryantasyon polimerde stres olu\u015fumuna yol a\u00e7acakt\u0131r. Polimer eriyi\u011finin y\u00fcksek viskozitesi nedeniyle, i\u00e7 gerilim h\u0131zl\u0131 bir \u015fekilde gev\u015fetilemez ve \u00fcr\u00fcn\u00fcn fiziksel \u00f6zelliklerini ve boyutsal kararl\u0131l\u0131\u011f\u0131n\u0131 etkiler.<\/p>\n

Her bir parametrenin oryantasyon gerilimi \u00fczerindeki etkisi<\/span><\/h3>\n

(1) Erime s\u0131cakl\u0131\u011f\u0131, y\u00fcksek erime s\u0131cakl\u0131\u011f\u0131, d\u00fc\u015f\u00fck viskozite ve kayma gerilimi oryantasyonu azalt\u0131r; \u00f6te yandan, y\u00fcksek erime s\u0131cakl\u0131\u011f\u0131 nedeniyle gerilme gev\u015femesi h\u0131zlan\u0131r ve oryantasyonsuzlu\u011fu g\u00fc\u00e7lendirme yetene\u011fi ortaya \u00e7\u0131kar.<\/p>\n

(2) Enjeksiyon kal\u0131plama makinesinin bas\u0131nc\u0131n\u0131n de\u011fi\u015ftirilmemesi durumunda, kal\u0131p bo\u015flu\u011fu bas\u0131nc\u0131 artacak ve g\u00fc\u00e7l\u00fc kesme etkisi oryantasyon geriliminde bir art\u0131\u015fa yol a\u00e7acakt\u0131r.<\/p>\n

(3) Nozul kapat\u0131lmadan \u00f6nce bekletme s\u00fcresinin uzat\u0131lmas\u0131 oryantasyon geriliminde art\u0131\u015fa yol a\u00e7acakt\u0131r.<\/p>\n

(4) Enjeksiyon bas\u0131nc\u0131n\u0131n veya tutma bas\u0131nc\u0131n\u0131n art\u0131r\u0131lmas\u0131 oryantasyon gerilimini art\u0131racakt\u0131r.<\/p>\n

(5) Y\u00fcksek kal\u0131p s\u0131cakl\u0131\u011f\u0131 \u00fcr\u00fcn\u00fcn yava\u015f so\u011fumas\u0131n\u0131 sa\u011flayabilir ve y\u00f6ns\u00fczle\u015fmede rol oynar.<\/p>\n

(6) Y\u00f6nlendirme gerilimini azaltmak i\u00e7in \u00fcr\u00fcn\u00fcn kal\u0131nl\u0131\u011f\u0131n\u0131 art\u0131r\u0131n, \u00e7\u00fcnk\u00fc kal\u0131n duvarl\u0131 \u00fcr\u00fcnler yava\u015f so\u011fur, viskozite artar ve uzun bir s\u00fcrenin gerilim gev\u015feme s\u00fcreci, bu nedenle y\u00f6nlendirme gerilimi k\u00fc\u00e7\u00fckt\u00fcr.<\/p>\n

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\"\"<\/figure>\n<\/div>\n

S\u0131cakl\u0131k stresi \u00fczerindeki etkisi<\/span><\/h3>\n

(1) As mentioned above, due to the large temperature gradient between the melt and the wall when filling the injection mold, the outer layer of the melt that solidifies first has to help stop the shrinkage of the inner thin surface layer of the melt that solidifies later, resulting in compressive stress (shrinkage stress) in the outer layer and tensile stress (orientation stress) in the inner layer.<\/p>\n

(2) If the mold is filled and continues for a long time under the action of holding pressure, the polymer melt is added to the mold cavity, so that the injection molding pressure in the mold cavity is increased, and this pressure will change the internal stress due to uneven temperature.<\/p>\n

Ancak, k\u0131sa bekletme s\u00fcresi ve d\u00fc\u015f\u00fck bo\u015fluk bas\u0131nc\u0131 durumunda, \u00fcr\u00fcn so\u011furken orijinal gerilim durumunu korumaya devam edecektir.<\/p>\n

(3) \u00dcr\u00fcn so\u011futman\u0131n erken a\u015famas\u0131nda kal\u0131p bo\u015flu\u011fu bas\u0131nc\u0131 yetersizse, \u00fcr\u00fcn\u00fcn d\u0131\u015f tabakas\u0131 kat\u0131la\u015fma b\u00fcz\u00fclmesi nedeniyle bir \u00e7\u00f6k\u00fcnt\u00fc olu\u015fturacakt\u0131r; e\u011fer enjeksiyon kal\u0131b\u0131<\/a> \u00dcr\u00fcn\u00fcn so\u011fuk sert bir tabaka olu\u015fturdu\u011fu sonraki a\u015famada bo\u015fluk bas\u0131nc\u0131 yetersiz kal\u0131rsa, \u00fcr\u00fcn\u00fcn i\u00e7 tabakas\u0131 b\u00fcz\u00fclme nedeniyle ayr\u0131lacak veya bo\u015fluklar olu\u015fturacakt\u0131r.<\/p>\n

(4) Kap\u0131 kapat\u0131lmadan \u00f6nce bo\u015fluk bas\u0131nc\u0131 korunursa, \u00fcr\u00fcn\u00fcn yo\u011funlu\u011funu art\u0131rmak ve so\u011futma s\u0131cakl\u0131\u011f\u0131 stresini ortadan kald\u0131rmak faydal\u0131d\u0131r, ancak kap\u0131n\u0131n yak\u0131n\u0131nda b\u00fcy\u00fck bir stres konsantrasyonu olu\u015facakt\u0131r.<\/p>\n

(5) Dolay\u0131s\u0131yla, kal\u0131ptaki bas\u0131n\u00e7 artt\u0131k\u00e7a bekletme s\u00fcresinin uzad\u0131\u011f\u0131, bunun da s\u0131cakl\u0131k taraf\u0131ndan \u00fcretilen b\u00fcz\u00fclme stresini azaltmaya yard\u0131mc\u0131 oldu\u011fu ve bunun tersinin de bas\u0131n\u00e7 stresini art\u0131raca\u011f\u0131 g\u00f6r\u00fclmektedir.<\/p>\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n<\/div>\n

\u0130\u00e7 stres ve \u00fcr\u00fcn kalitesi aras\u0131ndaki ili\u015fki<\/span><\/h3>\n

(1) \u00dcr\u00fcndeki i\u00e7 gerilimin varl\u0131\u011f\u0131, \u00fcr\u00fcn\u00fcn mekanik \u00f6zelliklerini ve performans\u0131n\u0131 ciddi \u015fekilde etkileyecektir; i\u00e7 gerilimin varl\u0131\u011f\u0131 ve e\u015fit olmayan da\u011f\u0131l\u0131m\u0131 nedeniyle, \u00fcr\u00fcn\u00fcn kullan\u0131m s\u00fcrecinde \u00e7atlaklar meydana gelecektir.<\/p>\n

Kullan\u0131m\u0131n alt\u0131ndaki cams\u0131 ge\u00e7i\u015f s\u0131cakl\u0131\u011f\u0131nda, genellikle d\u00fczensiz deformasyon veya \u00e7arp\u0131lma meydana gelir, ancak ayn\u0131 zamanda \u00fcr\u00fcn\u00fcn y\u00fczeyinin \"beyaz\", bulutlu, optik \u00f6zelliklerinin bozulmas\u0131na neden olur.<\/p>\n

(2) Kap\u0131daki s\u0131cakl\u0131\u011f\u0131 d\u00fc\u015f\u00fcrmeye \u00e7al\u0131\u015f\u0131n ve yava\u015f so\u011futma s\u00fcresini art\u0131r\u0131n, bu da \u00fcr\u00fcn\u00fcn art\u0131k gerilme d\u00fczensizli\u011fini iyile\u015ftirmeye yard\u0131mc\u0131 olur, b\u00f6ylece \u00fcr\u00fcn\u00fcn mekanik \u00f6zellikleri tekd\u00fcze olur.<\/p>\n

(3) Kristal polimer veya kristal olmayan polimer fark etmeksizin, gerilme mukavemeti anizotropik \u00f6zellikler g\u00f6sterir.<\/p>\n

Kristal olmayan polimerler i\u00e7in gerilme mukavemeti ge\u00e7idin konumuna ba\u011fl\u0131 olarak de\u011fi\u015fir; ge\u00e7it kal\u0131p dolgusu ile ayn\u0131 y\u00f6nde oldu\u011funda, eriyik s\u0131cakl\u0131\u011f\u0131 artt\u0131k\u00e7a gerilme mukavemeti azal\u0131r; ge\u00e7it kal\u0131p dolgusuna dik oldu\u011funda enjeksiyon kal\u0131b\u0131<\/a> dolum y\u00f6n\u00fcnde, eriyik s\u0131cakl\u0131\u011f\u0131 artt\u0131k\u00e7a gerilme mukavemeti artar.<\/p>\n

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\"\"<\/figure>\n<\/div>\n<\/div>\n<\/div>\n

(4) Eriyik s\u0131cakl\u0131\u011f\u0131n\u0131n artmas\u0131 yeniden y\u00f6nlendirme etkisinin g\u00fc\u00e7lenmesine yol a\u00e7arken, y\u00f6nlendirme etkisinin zay\u0131flamas\u0131 gerilme mukavemetini azalt\u0131r.<\/p>\n

Kap\u0131n\u0131n y\u00f6n\u00fc, malzeme ak\u0131\u015f\u0131n\u0131n y\u00f6n\u00fcn\u00fc etkileyerek oryantasyonu etkiler ve kristal olmayan polimerlerin anizotropisi kristal polimerlerden daha g\u00fc\u00e7l\u00fc oldu\u011fundan, ak\u0131\u015f y\u00f6n\u00fcne dik y\u00f6ndeki gerilme mukavemeti birincisi i\u00e7in ikincisinden daha fazlad\u0131r.<\/p>\n

D\u00fc\u015f\u00fck s\u0131cakl\u0131k enjeksiyon kal\u0131plama<\/a> y\u00fcksek s\u0131cakl\u0131ktaki enjeksiyondan daha fazla mekanik anizotropiye sahiptir, \u00f6rne\u011fin ak\u0131\u015f y\u00f6n\u00fcne dik mukavemet oran\u0131 y\u00fcksek enjeksiyon s\u0131cakl\u0131\u011f\u0131nda 1,7 ve d\u00fc\u015f\u00fck enjeksiyon s\u0131cakl\u0131\u011f\u0131nda 2'dir.<\/p>\n

(5) Bu nedenle, eriyik s\u0131cakl\u0131\u011f\u0131ndaki bir art\u0131\u015f\u0131n hem kristal hem de kristal olmayan polimerler i\u00e7in gerilme mukavemetinde bir azalmaya yol a\u00e7t\u0131\u011f\u0131 g\u00f6r\u00fclmektedir, ancak mekanizma farkl\u0131d\u0131r; ilki oryantasyon yoluyla azalman\u0131n etkisinden kaynaklanmaktad\u0131r.<\/p>\n

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\u0130\u00e7 gerilim olu\u015fumu Enjeksiyonla kal\u0131planm\u0131\u015f \u00fcr\u00fcnlerde, yerel gerilim durumu her yerde farkl\u0131d\u0131r ve \u00fcr\u00fcn deformasyonunun derecesi art\u0131k gerilim da\u011f\u0131l\u0131m\u0131 taraf\u0131ndan belirlenecektir. E\u011fer \u00fcr\u00fcn so\u011futulursa. Bir s\u0131cakl\u0131k gradyan\u0131 varsa, bu t\u00fcr bir stres geli\u015fecektir, bu nedenle bu t\u00fcr bir stres de [...]<\/p>","protected":false},"author":1,"featured_media":11860,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Cause Analysis Of Internal Stress In Plastic | ZetarMold","_seopress_titles_desc":"Explore the properties and applications of internal stress plastic injection molding. ZetarMold helps you select the right plastic resin for your injection","_seopress_robots_index":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[42],"tags":[],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts\/11853"}],"collection":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/comments?post=11853"}],"version-history":[{"count":0,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/posts\/11853\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/media\/11860"}],"wp:attachment":[{"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/media?parent=11853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/categories?post=11853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zetarmold.com\/tr\/wp-json\/wp\/v2\/tags?post=11853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}