{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T14:58:58Z","timestamp":1783609138470,"version":"3.55.0"},"reference-count":29,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T00:00:00Z","timestamp":1765497600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002543","name":"Pusan National University","doi-asserted-by":"publisher","award":["2-Year Research Grant"],"award-info":[{"award-number":["2-Year Research Grant"]}],"id":[{"id":"10.13039\/501100002543","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The increasing use of vinyl-coated metal (VCM) sheets in home appliances requires robust forming processes to prevent defects such as delamination and wrinkling, especially under elevated temperatures and humidity. This study presents a deep neural network (DNN)-based multi-objective optimization framework to determine optimal stamping parameters for VCM sheets. A delamination limit diagram (DLD) is experimentally established by combining limit dome height tests with immersion tests, defining the critical strain boundary under environmentally conditions. A finite element (FE) based dataset of four process variables was then used to train a DNN surrogate model with high predictive accuracy. Using the trained DNN model, Pareto-based optimization identifies nondominated solutions balancing delamination and wrinkling. The optimal condition was validated by FE simulation, confirming simultaneous suppression of both defects within the DLD. The proposed DNN\u2013Pareto framework provides and efficient and reliable tool for defect prediction and optimization in VCM stamping, ensuring high surface quality and environmental durability.<\/jats:p>","DOI":"10.3390\/ma18245589","type":"journal-article","created":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T12:52:31Z","timestamp":1765543951000},"page":"5589","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Process Design of Vinyl-Coated Metal Sheet Stamping for Prevention of Delamination and Wrinkling by DNN-Based Multi-Objective Optimization"],"prefix":"10.3390","volume":"18","author":[{"given":"Min-Gi","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Nanomechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jae-Chang","family":"Ryu","sequence":"additional","affiliation":[{"name":"Industrial Liaison Innovation Center, Pusan National University, Busan 46241, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chan-Joo","family":"Lee","sequence":"additional","affiliation":[{"name":"Advanced Mobility Components Group, Korea Institute of Industrial Technology, Daegu 42994, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6801-9109","authenticated-orcid":false,"given":"Jin-Seok","family":"Jang","sequence":"additional","affiliation":[{"name":"Advanced Mobility Components Group, Korea Institute of Industrial Technology, Daegu 42994, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4064-739X","authenticated-orcid":false,"given":"Dae-Cheol","family":"Ko","sequence":"additional","affiliation":[{"name":"Department of Nanomechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1016\/S0924-0136(01)01088-3","article-title":"An experimental study on forming characteristics of pre-coated sheet metal","volume":"120","author":"Kim","year":"2002","journal-title":"J. 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