![\"D\u00f6k\u00fcm](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/Casting-Crack-1.jpg\")
<\/h2>\nAl\u00fcminyum d\u00f6k\u00fcmlerdeki d\u00f6k\u00fcm \u00e7atlaklar\u0131, metal yap\u0131n\u0131n s\u00fcreklili\u011fini bozan ve b\u00fcy\u00fck zarara yol a\u00e7an bir kusur t\u00fcr\u00fcd\u00fcr. Sonraki ekstr\u00fczyon veya kalenderleme i\u015flemlerinde bu \u00e7atlaklar birle\u015ftirilemez. Bu nedenle, \u00e7atlak i\u00e7eren k\u00fcl\u00e7eler, k\u00fcl\u00e7e denetimi s\u0131ras\u0131nda tamamen at\u0131k \u00fcr\u00fcn olarak kabul edilir. D\u00f6k\u00fcm \u00e7atlaklar\u0131n\u0131n varl\u0131\u011f\u0131, al\u00fcminyum i\u015fleme i\u015fletmelerinin \u00fcretim verimlili\u011fini ve ekonomik kazan\u00e7lar\u0131n\u0131 ciddi \u015fekilde etkiler. Bu nedenle, \u00e7atlak kusurlar\u0131n\u0131n olu\u015fumunu azaltmak ve k\u00fcl\u00e7e verimini art\u0131rmak amac\u0131yla, bu kusurlar\u0131 sistematik olarak analiz etmek, incelemek ve \u00fcretimde etkili \u00f6nlemler almak gereklidir.<\/p>\n
Olu\u015fum s\u00fcrecine g\u00f6re, d\u00f6k\u00fcm \u00e7atlaklar\u0131 genellikle s\u0131cak \u00e7atlaklar ve so\u011fuk \u00e7atlaklar olarak ikiye ayr\u0131l\u0131r.<\/p>\n
S\u0131cak \u00e7atlaklar, etkili kristalle\u015fme aral\u0131\u011f\u0131nda olu\u015fan \u00e7atlaklard\u0131r. Yuvarlak k\u00fcl\u00e7eleri \u00f6rnek olarak al\u0131rsak, makroskobik belirtileri aras\u0131nda y\u00fczey \u00e7atlaklar\u0131, merkez \u00e7atlaklar\u0131, halka \u00e7atlaklar\u0131, radyal \u00e7atlaklar, giri\u015f \u00e7atlaklar\u0131 vb. say\u0131labilir.<\/p>\n
So\u011fuk \u00e7atlama, ala\u015f\u0131m\u0131n solidus s\u0131cakl\u0131\u011f\u0131n\u0131n alt\u0131nda oldu\u011fu s\u0131rada olu\u015fan \u00e7atlaklar\u0131 ifade eder ve bunlar\u0131n \u00e7o\u011fu yakla\u015f\u0131k 200 \u00b0C\u2019de meydana gelir. Yan \u00e7atlaklar, alt \u00e7atlaklar ve yar\u0131klar \u00e7o\u011funlukla so\u011fuk \u00e7atlaklard\u0131r.<\/p>\n
<\/h2>\nSo\u011fuk \u00e7atlama genellikle d\u00f6k\u00fcmlerin gerilen k\u0131s\u0131mlar\u0131nda meydana gelir. Duvar kal\u0131nl\u0131\u011f\u0131 farklar\u0131 b\u00fcy\u00fck olan ve karma\u015f\u0131k \u015fekilli d\u00f6k\u00fcmler, \u00f6zellikle de b\u00fcy\u00fck ve ince d\u00f6k\u00fcmler, so\u011fuk \u00e7atlamaya yatk\u0131nd\u0131r. D\u00f6k\u00fcmdeki gerilimi art\u0131rabilecek, mukavemetini ve plastisitesini azaltabilecek t\u00fcm fakt\u00f6rler, so\u011fuk \u00e7atlaklar\u0131n olu\u015fumunu te\u015fvik eder.<\/p>\n
S\u0131cak \u00e7atlama, tamamen ortadan kald\u0131r\u0131lmas\u0131 zor olan yayg\u0131n bir d\u00f6k\u00fcm kusurudur. Al-Si ala\u015f\u0131m\u0131 hari\u00e7, neredeyse t\u00fcm end\u00fcstriyel \u015fekillendirilmi\u015f al\u00fcminyum ala\u015f\u0131mlar\u0131nda g\u00f6r\u00fcl\u00fcr. Termal \u00e7atlaklar\u0131n olu\u015fum mekanizmas\u0131 temel olarak mukavemet teorisi, s\u0131v\u0131 film teorisi ve \u00e7atlak olu\u015fum teorisini i\u00e7erir. Bunlar aras\u0131nda mukavemet teorisi en yayg\u0131n olan\u0131d\u0131r. Ala\u015f\u0131m\u0131n y\u00fcksek s\u0131cakl\u0131kta mekanik \u00f6zelliklerine ili\u015fkin ara\u015ft\u0131rma sonu\u00e7lar\u0131na dayanarak, t\u00fcm ala\u015f\u0131mlar\u0131n solidus s\u0131cakl\u0131\u011f\u0131n\u0131n \u00fczerindeki kat\u0131-s\u0131v\u0131 b\u00f6lgede mukavemetinin son derece d\u00fc\u015f\u00fck ve uzamas\u0131n\u0131n son derece az oldu\u011fu bir \u201ck\u0131r\u0131lganl\u0131k s\u0131cakl\u0131k aral\u0131\u011f\u0131\u201dna sahip oldu\u011fu d\u00fc\u015f\u00fcn\u00fclmektedir. Ala\u015f\u0131m bu aral\u0131kta so\u011fudu\u011funda, b\u00fcz\u00fclmenin neden oldu\u011fu gerilim o anda metalin mukavemetini a\u015farsa veya gerilimin neden oldu\u011fu deformasyon metalin plastisitesini a\u015farsa, bu durum s\u0131cak \u00e7atlaklar\u0131n olu\u015fmas\u0131na yol a\u00e7ar.<\/p>\n
\u00dcretim s\u00fcrecinde genellikle tamamen s\u0131cak \u00e7atlaklar veya tamamen so\u011fuk \u00e7atlaklar g\u00f6r\u00fclmez. Bunlar\u0131n \u00e7o\u011fu \u00f6nce s\u0131cak \u00e7atlaklar olu\u015fturur ve ard\u0131ndan so\u011fuma s\u00fcreci boyunca s\u0131cak \u00e7atlaklardan so\u011fuk \u00e7atlaklara d\u00f6n\u00fc\u015f\u00fcr.<\/p>\n
D\u00f6k\u00fcm \u00e7atlaklar\u0131n\u0131n olu\u015fumunda etkili olan fakt\u00f6rler, esas olarak eriyik kalitesi, d\u00f6k\u00fcm ekipman\u0131, d\u00f6k\u00fcm proses ko\u015fullar\u0131 ve tanecik yap\u0131s\u0131 ile ilgilidir. Bu nedenle, d\u00f6k\u00fcm \u00e7atlaklar\u0131n\u0131n olu\u015fmas\u0131n\u0131 \u00f6nlemek amac\u0131yla bu d\u00f6rt a\u00e7\u0131dan gerekli \u00f6nlemleri alabiliriz.<\/p>\n
![\"D\u00f6k\u00fcm](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/Casting-Crack-3.jpg\")
<\/p>\n
Kirlilik i\u00e7eri\u011fini azalt\u0131n<\/strong><\/p>\n Kimyasal bile\u015fimin optimize edilmesi, ala\u015f\u0131m\u0131n kal\u0131planabilirli\u011fini art\u0131rabilir ve k\u00fcl\u00e7ede \u00e7atlak olu\u015fumunu azaltabilir. Safs\u0131zl\u0131k i\u00e7eri\u011fi y\u00fcksek oldu\u011funda, ala\u015f\u0131m yap\u0131s\u0131ndaki kafes bozulmas\u0131 artar, i\u00e7 gerilim y\u00fckselir ve plastik deformasyona kar\u015f\u0131 diren\u00e7 b\u00fcy\u00fck \u00f6l\u00e7\u00fcde azal\u0131r; bu da ala\u015f\u0131m\u0131n \u00e7atlamaya yatk\u0131n hale gelmesine neden olur.<\/p>\n Gaz i\u00e7eri\u011fini ve kal\u0131nt\u0131 i\u00e7eri\u011fini azalt\u0131n<\/strong><\/p>\n Al\u00fcminyum ve al\u00fcminyum ala\u015f\u0131mlar\u0131n\u0131n eritilmesi s\u0131ras\u0131nda, f\u0131r\u0131n gaz\u0131 ve hava gaz\u0131, aray\u00fczde erimi\u015f al\u00fcminyumla etkile\u015fime girmeli ve bu etkile\u015fim sonucunda birle\u015fme, ayr\u0131\u015fma, \u00e7\u00f6z\u00fcnme ve dif\u00fczyon gibi s\u00fcre\u00e7ler meydana gelmelidir. Al\u00fcminyum oksitlenir ve gaz\u0131 emer.<\/p>\n \u00c7\u00fcnk\u00fc eriyik taraf\u0131ndan emilen gazdaki H\u2082 miktar\u0131 %\u2019den fazlad\u0131r ve eriyikteki hidrojenin \u00e7\u00f6z\u00fcn\u00fcrl\u00fc\u011f\u00fc s\u0131cakl\u0131k d\u00fc\u015ft\u00fck\u00e7e azal\u0131r. Eriyik kristalle\u015fip kat\u0131la\u015ft\u0131\u011f\u0131nda b\u00fcy\u00fck miktarda gaz \u00e7\u00f6kelir ve k\u00fcl\u00e7e g\u00f6zenekleri olu\u015fur. Kapan\u0131mlar ve g\u00f6zenekler, taneler aras\u0131ndaki ba\u011f\u0131 zay\u0131flatarak gerilme yo\u011funla\u015fmas\u0131na neden olabilir, bu da k\u00fcl\u00e7enin plastisitesini ve mukavemetini azaltarak d\u00f6k\u00fcm \u00e7atlaklar\u0131na yol a\u00e7ar.<\/p>\n AdTech, al\u00fcminyum ala\u015f\u0131m\u0131ndaki \u00e7atlaklar\u0131 giderebilir. Bu \u00e7evrimi\u00e7i gaz giderme \u00fcnitesi<\/a> ve CFF filtreleme \u00fcnitesi<\/a> AdTech taraf\u0131ndan geli\u015ftirilen bu teknoloji, hidrojeni ve di\u011fer safs\u0131zl\u0131klar\u0131 giderebilir ve al\u00fcminyum ala\u015f\u0131mlar\u0131ndaki g\u00f6zeneklili\u011fi ve \u00e7atlaklar\u0131 azaltabilir.<\/p>","protected":false},"excerpt":{"rendered":" Casting crack in aluminum casting is a kind of defect with great harm, it destroys the continuity of metal structure. In the subsequent extrusion or…<\/p>","protected":false},"author":1,"featured_media":4540,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[322,321],"class_list":["post-2202","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-cast-aluminum-repair","tag-casting-crack-in-aluminum-casting"],"yoast_head":"\n