{"id":726,"date":"2024-03-20T02:28:51","date_gmt":"2024-03-20T02:28:51","guid":{"rendered":"https:\/\/lmmworkrolls.com\/?p=726"},"modified":"2024-03-20T02:28:54","modified_gmt":"2024-03-20T02:28:54","slug":"yedek-silindirlerin-dovulmesinde-enine-catlaklarin-analizi","status":"publish","type":"post","link":"https:\/\/lmmworkrolls.com\/tr\/yedek-silindirlerin-dovulmesinde-enine-catlaklarin-analizi\/","title":{"rendered":"Yedek rulolar\u0131n d\u00f6v\u00fclmesinde enine \u00e7atlaklar\u0131n analizi"},"content":{"rendered":"

\u00c7atlaklar \u015fu anda d\u00f6vme \u00fcretiminin geli\u015fimini ve d\u00f6vme kalitesini etkileyen \u00f6nemli bir sorundur ve ayr\u0131ca d\u00f6vme end\u00fcstrisinde ara\u015ft\u0131rma ve tart\u0131\u015fman\u0131n odak noktas\u0131d\u0131r. Yeni malzemeler ve d\u00f6vme s\u00fcre\u00e7leri \u00fczerine yap\u0131lan ara\u015ft\u0131rmalarla birlikte, d\u00f6vmedeki \u00e7atlaklar da yo\u011fun \u00e7atlaklar, uzunlamas\u0131na \u00e7atlaklar ve enine \u00e7atlaklar gibi bir\u00e7ok farkl\u0131 form g\u00f6stermektedir. 2019'da, VC'nin d\u00f6v\u00fclmesi ve bozulmas\u0131 s\u0131ras\u0131nda dikey \u00e7atlaklar daha ciddiydi yedek rulolar<\/a> \u00dcr\u00fcnler, manuel temizli\u011fi zorla\u015ft\u0131r\u0131r. \u00dcretim s\u00fcrecini optimize ederek, inkl\u00fczyon kontrol\u00fcn\u00fc iyile\u015ftirerek ve \u00e7elik k\u00fcl\u00e7enin y\u00fczey kalitesini iyile\u015ftirerek \u00e7atlaklar \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirildi, ancak d\u00f6vme s\u00fcrecinde enine \u00e7atlaklar sorunu hala mevcuttur.<\/p>\n\n\n\n

\u015eirketin VC'si \u00e7elik k\u00fcl\u00e7e<\/a> Do\u011fal gazla \u0131s\u0131t\u0131l\u0131r ve \u0131s\u0131tma s\u0131cakl\u0131\u011f\u0131 1240~1260\u00b0C'dir. VC \u00e7elik k\u00fcl\u00e7esinin tonaj\u0131 nispeten b\u00fcy\u00fckt\u00fcr, genellikle 50t'den fazlad\u0131r. \u00dc\u00e7 ate\u015fte d\u00f6v\u00fcl\u00fcr, ilk ate\u015fte y\u00fckselir ve kelep\u00e7eye bask\u0131 yapar; ikinci ate\u015f iskelesi kal\u0131nla\u015ft\u0131r\u0131l\u0131r ve uzat\u0131l\u0131r. ; \u00dc\u00e7\u00fcnc\u00fc ate\u015fte bitmi\u015f \u00fcr\u00fcn d\u00f6v\u00fcl\u00fcr. Genellikle, ikinci ate\u015ften sonra VC \u00e7elik k\u00fcl\u00e7elerinin y\u00fczeyinde yo\u011fun enine \u00e7atlaklar belirir ve y\u00fczeyin bir taraf\u0131nda daha belirgindir. Ancak, bu t\u00fcr \u00e7atlaklar p\u00fcr\u00fczlendirme i\u015flemi s\u0131ras\u0131nda belirgin de\u011fildir. \u0130kinci ate\u015f uzamas\u0131ndan sonra, \u00e7elik k\u00fcl\u00e7enin y\u00fczeyindeki yo\u011fun \u00e7atlaklar \u015eekil 1'de g\u00f6sterildi\u011fi gibidir.<\/p>\n\n\n\n

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

\u015eekil 1 \u00c7elik k\u00fcl\u00e7e y\u00fczeyindeki yo\u011fun \u00e7atlaklar\u0131n durumu<\/strong><\/strong><\/p>\n\n\n\n

\u00c7elik k\u00fcl\u00e7e ikinci ate\u015fte d\u00f6v\u00fcld\u00fc, f\u0131r\u0131na y\u00fcklendi ve tavland\u0131, ard\u0131ndan y\u00fczeyi \u00f6rneklendi ve test edildi.<\/p>\n\n\n\n

S\u00fcre\u00e7 incelemesi<\/strong><\/h2>\n\n\n\n

Genel olarak enine \u00e7atlaklar\u0131n veya y\u00fczeysel \u00e7atlaklar\u0131n olu\u015fumunun iki hususla do\u011frudan ili\u015fkili oldu\u011fu d\u00fc\u015f\u00fcn\u00fclmektedir.<\/p>\n\n\n\n

1) Cu ve As vb. gibi kal\u0131nt\u0131 elementler standard\u0131 a\u015farsa, \u00fcst \u00fcste bindirme veya \u00e7ekme i\u015flemi s\u0131ras\u0131nda alan \u00e7atlaklar\u0131 ortaya \u00e7\u0131kar. Bu nedenle, \u015fiddetli \u00e7atlaklar\u0131n oldu\u011fu alanlar \u00f6rneklendi ve spektral analiz sonu\u00e7lar\u0131 Tablo 1'de g\u00f6sterilmi\u015ftir.<\/p>\n\n\n\n

Tablo 1 \u015eiddetli \u00e7atlak alanlar\u0131n\u0131n spektral analiz sonu\u00e7lar\u0131 (k\u00fctle kesri) (%)<\/strong><\/strong><\/p>\n\n\n\n

P<\/td>S<\/td>Cu<\/td>Gibi<\/td>Sb<\/td>Sn<\/td><\/tr>
0.008<\/td>0.003<\/td>0.05<\/td>0.005<\/td>0.002<\/td>0.002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Kimyasal bile\u015fim testlerinde, standartlar\u0131n \u00fczerinde belirgin bir zararl\u0131 unsura rastlanmad\u0131.<\/p>\n\n\n\n

2) A\u015f\u0131r\u0131 d\u00f6vme \u0131s\u0131tma s\u0131cakl\u0131\u011f\u0131n\u0131n neden oldu\u011fu a\u015f\u0131r\u0131 yanma. \u0130lk zamanlarda, d\u00f6vme kolu \u00e7elik k\u00fcl\u00e7enin \u0131s\u0131tma i\u015flemi s\u0131ras\u0131nda bir tarafta a\u015f\u0131r\u0131 yanma nedeniyle ciddi uzunlamas\u0131na \u00e7atlama sorunlar\u0131 ya\u015fad\u0131. \u00c7elik k\u00fcl\u00e7e d\u00f6vme i\u015fleminden sonra ciddi kay\u0131plar ya\u015fad\u0131. Ancak, bu \u00e7elik k\u00fcl\u00e7enin y\u0131pratma i\u015flemi s\u0131ras\u0131nda hi\u00e7bir \u00e7atlak bulunmad\u0131 ve \u0131s\u0131tma s\u0131cakl\u0131\u011f\u0131n\u0131n geri kontrol edildi\u011finde standard\u0131 a\u015fmad\u0131\u011f\u0131 g\u00f6r\u00fcld\u00fc.<\/p>\n\n\n\n

Y\u00fcksek h\u0131zl\u0131 tak\u0131m \u00e7eli\u011finin d\u00f6vme teknolojisi<\/strong><\/h2>\n\n\n\n

Metalografik analiz<\/strong><\/h3>\n\n\n\n

(1) \u00c7elik k\u00fcl\u00e7enin y\u00fczeyinde \u00e7atlaklar\u0131n olmad\u0131\u011f\u0131 normal konumda metalografik faz\u0131 tespit edin. Cilal\u0131 parlak noktan\u0131n derinli\u011fi 1~2 mm'dir. Yap\u0131 perlit + az miktarda karb\u00fcrd\u00fcr ve \u015eekil 2'de g\u00f6sterildi\u011fi gibi hi\u00e7bir kapan\u0131m bulunmaz.<\/p>\n\n\n\n

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

\u015eekil 2 Y\u00fczeydeki \u00e7atlaks\u0131z yerlerin metalografik muayenesi<\/strong><\/strong><\/p>\n\n\n\n

(2) Kusur yeri: \u00c7elik k\u00fcl\u00e7enin y\u00fczeyinde ciddi \u00e7atlaklar\u0131n oldu\u011fu b\u00f6lgedeki metalografik yap\u0131y\u0131 tespit edin (toplamda 3 nokta). Cilal\u0131 parlak noktan\u0131n derinli\u011fi 4~5 mm'dir. Yap\u0131 ferrittir ve \u015eekil 3'te g\u00f6sterildi\u011fi gibi hi\u00e7bir kapan\u0131m bulunmam\u0131\u015ft\u0131r.<\/p>\n\n\n\n

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

\u015eekil 3 \u015eiddetli alanlarda metalografik yap\u0131 tespiti<\/strong><\/strong><\/p>\n\n\n\n

Yerinde yap\u0131lan metalografik incelemede, g\u00f6r\u00fc\u015f alan\u0131n\u0131n tamam\u0131n\u0131n ferrit yap\u0131dan olu\u015ftu\u011fu, perlit yap\u0131s\u0131na rastlanmad\u0131\u011f\u0131, dekarb\u00fcrizasyon tabakas\u0131n\u0131n derinli\u011finin ise normal k\u0131s\u0131mdan belirgin \u015fekilde daha derin oldu\u011fu g\u00f6r\u00fclm\u00fc\u015ft\u00fcr.<\/p>\n\n\n\n

(3) Kusur yeri \u00f6rneklemesi: \u00c7elik k\u00fcl\u00e7e y\u00fczeyinde ciddi \u00e7atlaklar\u0131n oldu\u011fu alan\u0131n \u00f6rneklemesi, \u015eekil 4'te g\u00f6sterilmi\u015ftir.<\/p>\n\n\n\n

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

\u015eekil 4 \u00c7elik k\u00fcl\u00e7edeki y\u00fczey \u00e7atlaklar\u0131<\/strong><\/strong><\/p>\n\n\n\n

\u015eekil 5'te g\u00f6sterildi\u011fi gibi al\u0131nan numune \u00fczerinde y\u00fcksek b\u00fcy\u00fctmeli metalografik inceleme yap\u0131ld\u0131. \u0130\u015faretli alan ferrit yap\u0131d\u0131r. \u015eekil 6'da g\u00f6sterildi\u011fi gibi bir cetvel kullanarak \u00e7atlak yak\u0131n\u0131ndaki ferrit yap\u0131n\u0131n (\u015eekil 5'teki parlak nokta alan\u0131) derinli\u011fi 9~10 mm ve geni\u015fli\u011fi yakla\u015f\u0131k 10 mm'dir.<\/p>\n\n\n\n

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

\u015eekil 5 \u0130\u015faretli alan ferrit yap\u0131d\u0131r<\/strong><\/p>\n\n\n\n

\u015eekil 6 Ferrit yap\u0131 derinli\u011fi<\/strong><\/strong><\/p>\n\n\n\n

\u015eekil 7 ve \u015eekil 8'deki iki foto\u011fraf\u0131 kar\u015f\u0131la\u015ft\u0131rd\u0131\u011f\u0131m\u0131zda, \u00e7atla\u011f\u0131n her iki taraf\u0131ndaki ferrit doku alan\u0131n\u0131n boyutunun a\u00e7\u0131k\u00e7a farkl\u0131 oldu\u011fu ve \u015eekil 5'te i\u015faretlenen alan (k\u0131rm\u0131z\u0131 \u00e7izgi) hari\u00e7, ferrit yap\u0131 oldu\u011fu, di\u011ferlerinin perlit yap\u0131 oldu\u011fu g\u00f6r\u00fclebilir. Numunenin metalografisi, ferrit b\u00f6lgesinin tane boyutunun 6 ila 10 seviye oldu\u011funu g\u00f6stermektedir. \u00c7elik k\u00fcl\u00e7enin y\u00fczeyindeki ferrit yap\u0131n\u0131n parlak nokta derinli\u011fini yeniden tespit edin, 10~12 mm'ye kadar parlat\u0131n ve perlit yap\u0131y\u0131 tespit edin.<\/p>\n\n\n\n

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

\u015eekil 7 \u00c7atlak yerindeki mikro yap\u0131 de\u011fi\u015fiklikleri<\/strong><\/p>\n\n\n\n

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

\u015eekil 8 Ferrit yap\u0131s\u0131<\/strong><\/strong><\/p>\n\n\n\n

Elektron mikroskobu analizi<\/strong><\/h3>\n\n\n\n

\u00c7atla\u011f\u0131n sa\u011f taraf\u0131 (alt k\u0131s\u0131mda siyah \u00e7izgiyle i\u015faretlenmi\u015ftir) ezildikten sonra, \u015eekil 9'da g\u00f6sterildi\u011fi gibi, k\u0131r\u0131k y\u00fczeyinin mikroskobik morfolojisi tespit edilir. \u015eekil 9'dan, perlit yap\u0131 alan\u0131n\u0131n ve ferrit yap\u0131 alan\u0131n\u0131n metalik parlakl\u0131\u011f\u0131n\u0131n a\u00e7\u0131k\u00e7a farkl\u0131 oldu\u011fu g\u00f6r\u00fclebilir. \u015eekil 10'da g\u00f6sterildi\u011fi gibi, k\u0131r\u0131k pozisyonunun elektron mikroskobu incelemesini ger\u00e7ekle\u015ftirin.<\/p>\n\n\n\n

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

\u015eekil 9 \u00c7atlak morfolojisi<\/strong><\/p>\n\n\n\n

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

\u015eekil 10 K\u0131r\u0131k pozisyonu tespiti<\/strong><\/strong><\/p>\n\n\n\n

K\u0131r\u0131k foto\u011fraflar\u0131 \u015eekil 10a'da \u015f\u00fcpheli ta\u015f benzeri bir k\u0131r\u0131k morfolojisi oldu\u011funu g\u00f6stermektedir. \u015eekil 10b'de perlit b\u00f6lgesindeki k\u0131r\u0131kta herhangi bir yar\u0131k yap\u0131s\u0131 bulunmamakla birlikte k\u0131r\u0131kta pasifle\u015fme belirtileri g\u00f6r\u00fclmektedir.<\/p>\n\n\n\n

Analiz<\/strong><\/h2>\n\n\n\n

1) \u00c7elik k\u00fcl\u00e7e y\u00fczeyinde ciddi enine \u00e7atlaklar\u0131n bulundu\u011fu tarafta, yerinde yap\u0131lan metalografi ile toplam 5 nokta tespit edilmi\u015ftir (normal pozisyonda 2 nokta ve \u00e7atlak pozisyonunda 3 nokta). Normal pozisyondaki iki noktan\u0131n tamam\u0131n\u0131n perlit yap\u0131, \u00e7atlak pozisyonundaki \u00fc\u00e7 noktan\u0131n ise ferrit yap\u0131 oldu\u011fu tespit edilmi\u015f olup, \u00e7elik k\u00fcl\u00e7e y\u00fczeyinde enine \u00e7atlaklar\u0131n bulundu\u011fu alan\u0131n y\u00fczey tabakas\u0131n\u0131n ferrit yap\u0131 oldu\u011fu anla\u015f\u0131lm\u0131\u015ft\u0131r.<\/p>\n\n\n\n

2) Numunenin k\u0131r\u0131lma y\u00fczeyi gevrek bir k\u0131r\u0131lma y\u00fczeyi olmayan bir yar\u0131k yap\u0131s\u0131 g\u00f6stermektedir ve hem ferrit hem de perlit b\u00f6lgelerinde a\u015f\u0131r\u0131 \u0131s\u0131nma belirtileri g\u00f6r\u00fclmektedir.<\/p>\n\n\n\n

3) Metalografik incelemede \u00e7atlaklarda bulunan oksit pullar\u0131, p\u00fcr\u00fczlendirme i\u015flemi s\u0131ras\u0131nda \u00e7elik k\u00fcl\u00e7enin y\u00fczey yap\u0131s\u0131ndaki sorunlardan dolay\u0131 ak\u0131\u015fkanl\u0131\u011f\u0131n zay\u0131f olmas\u0131ndan kaynaklanm\u0131\u015f olabilir. Daha sonraki uzama s\u0131ras\u0131nda oksit pullar\u0131n\u0131n bir k\u0131sm\u0131 \u00e7atlaklara bast\u0131r\u0131labilir.<\/p>\n\n\n\n

\u00c7\u00f6z\u00fcm \u00a0<\/strong><\/h2>\n\n\n\n

\u00c7elik k\u00fcl\u00e7enin y\u00fczeyindeki enine \u00e7atlak alan\u0131nda 10 mm derinli\u011finde bir ferrit yap\u0131 vard\u0131r ve y\u00fcksek s\u0131cakl\u0131kta d\u00f6vme performans\u0131 zay\u0131ft\u0131r, bunun sonucunda y\u00fczeyde yo\u011fun enine \u00e7atlaklar olu\u015fur. Bunun ba\u015fl\u0131ca nedeni, \u00e7elik k\u00fcl\u00e7enin ve br\u00fcl\u00f6r\u00fcn kar\u015f\u0131l\u0131k gelen konumlar\u0131 ile f\u0131r\u0131n\u0131n yerel atmosferi aras\u0131nda belirli bir ili\u015fki olmas\u0131d\u0131r. \u00c7elik k\u00fcl\u00e7enin konumunu standartla\u015ft\u0131rmak ve f\u0131r\u0131n atmosferinin d\u00fczg\u00fcnl\u00fc\u011f\u00fcn\u00fc d\u00fczenli olarak test etmek gerekir.<\/p>","protected":false},"excerpt":{"rendered":"

Cracks are currently a prominent issue affecting the development of forging production and the quality of forgings, and are also a focus of research and discussion in the forging industry. With the research on new materials and forging processes, cracks in forging also show many different forms, such as dense cracks, longitudinal cracks and transverse […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-726","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nAnalysis of transverse cracks in forging of backup rolls - Work rolls, Backup rolls, Strip rolls - LMM GROUP Mill rolls manufacturer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lmmworkrolls.com\/tr\/yedek-silindirlerin-dovulmesinde-enine-catlaklarin-analizi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Analysis of transverse cracks in forging of backup rolls\" \/>\n<meta property=\"og:description\" content=\"Cracks are currently a prominent issue affecting the development of forging production and the quality of forgings, and are also a focus of research and discussion in the forging industry. 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