{"id":599,"date":"2018-10-17T00:13:07","date_gmt":"2018-10-16T16:13:07","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=599"},"modified":"2018-10-17T00:13:07","modified_gmt":"2018-10-16T16:13:07","slug":"chapter-25-3-residual-stress-china-injection-mold","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/nb\/2018\/10\/17\/kapittel-25-3-restspenninger-i-kina-sproytestopeform\/","title":{"rendered":"Kapittel 25-3, Restspenning, spr\u00f8ytest\u00f8peform av porselen"},"content":{"rendered":"
\n
\n
Kapittel 25-3, Restspenning, spr\u00f8ytest\u00f8peform av porselen
\nHjem<\/a>\u00a0\"\u00a0Blogg om st\u00f8peformteknologi<\/a>\u00a0\"\u00a0Nyhetssenter<\/a>\u00a0\" Kapittel 25-3, Restspenning, spr\u00f8ytest\u00f8peform av porselen<\/div>\n<\/div>\n<\/div>\n
<\/div>\n

\"\"<\/p>\n

FIGUR 5. Varierende restspenninger oppst\u00e5r, og delen deformeres n\u00e5r lag med forskjellig innfrosset spesifikt volum interagerer med hverandre<\/h3>\n

Prosessindusert restspenning kontra restspenning i hulrommet<\/h2>\n

Data om prosessinduserte restspenninger er mye mer nyttige enn data om restspenninger i hulrommet for simulering av st\u00f8ping. Nedenfor f\u00f8lger definisjoner av de to begrepene, sammen med et eksempel som illustrerer forskjellen mellom dem.<\/p>\n

Prosessindusert restspenning<\/h3>\n

Etter at delen er st\u00f8pt ut, frigj\u00f8res begrensningene fra formhulrommet, og delen kan krympe og deformeres fritt. Etter at den har innstilt seg i en likevektstilstand, kalles den gjenv\u00e6rende spenningen inne i delen for prosessindusert restspenning, eller bare restspenning. Prosessindusert restspenning kan v\u00e6re str\u00f8mningsindusert eller termisk indusert, der sistnevnte er den dominerende komponenten.<\/p>\n

Restspenning i hulrommet<\/h3>\n

Mens delen fortsatt er innesperret i formhulen, akkumuleres det indre stresset som oppst\u00e5r under st\u00f8rkningen, kalt restspenning i hulrommet. Denne restspenningen i hulrommet er den kraften som f\u00f8rer til krymping og skjevhet etter utst\u00f8ping.<\/p>\n

Eksempel<\/h3>\n

Krympingsfordelingen som er beskrevet i Warpage p\u00e5 grunn av differensiell krymping, f\u00f8rer til en termisk indusert restspenningsprofil for en utst\u00f8pt del, som vist i figuren nederst til venstre nedenfor. Spenningsprofilen i figuren \u00f8verst til venstre er restspenningen i formhulen, der den st\u00f8pte delen forblir innesperret i formen f\u00f8r den st\u00f8pes ut. N\u00e5r delen st\u00f8pes ut og den begrensede kraften fra formen frigj\u00f8res, vil delen krympe og vri seg for \u00e5 frigj\u00f8re den innebygde restspenningen (vanligvis strekkspenning, som vist) og n\u00e5 en likevektstilstand. Likevektstilstanden betyr at det ikke er noen ytre kraft som virker p\u00e5 delen, og at strekk- og trykkspenningene over delens tverrsnitt skal balansere med hverandre. Figurene p\u00e5 h\u00f8yre side tilsvarer tilfellet med en ujevn avkj\u00f8ling over hele godstykkelsen, noe som f\u00f8rer til en asymmetrisk fordeling av restspenningene.<\/p>\n

\"Restspenningsprofil<\/p>\n

FIGUR 6. Restspenningsprofil i hulrommet (\u00f8verst) vs. prosessindusert restspenningsprofil og delform etter utst\u00f8ting (nederst).<\/p>\n

Reduserer termisk indusert restspenning<\/h2>\n

Forhold som f\u00f8rer til tilstrekkelig pakking og jevnere temperaturer i formveggen, vil redusere de varmeinduserte restspenningene. Disse inkluderer:
\n- Riktig pakketrykk og varighet
\n- Jevn kj\u00f8ling av alle overflater p\u00e5 delen
\n- Ensartet tykkelse p\u00e5 veggseksjonen<\/p>","protected":false},"excerpt":{"rendered":"

Chapter 25-3, Residual stress, china injection mold Home\u00a0\u00bb\u00a0Mould Technology Blog\u00a0\u00bb\u00a0News Center\u00a0\u00bb Chapter 25-3, Residual stress, china injection mold FIGURE 5.\u00a0Variable residual stresses arise and the part deforms as layers of different frozen-in specific volume interact with each other Process-induced vs. in-cavity residual stress Process-induced residual stress data are much more useful than in-cavity residual stress […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-599","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"\nChapter 25-3, Residual stress, china injection mold - Plastic Mold | China Mold Maker<\/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:\/\/www.plasticmoldco.com\/nb\/2018\/10\/17\/\u03ba\u03b5\u03c6\u03ac\u03bb\u03b1\u03b9\u03bf-25-3-\u03c5\u03c0\u03bf\u03bb\u03b5\u03b9\u03bc\u03bc\u03b1\u03c4\u03b9\u03ba\u03ad\u03c2-\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2-\u03c3\u03b5-\u03ba\/\" \/>\n<meta property=\"og:locale\" content=\"nb_NO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-3, Residual stress, china injection mold - 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