{"id":623,"date":"2018-10-17T00:22:30","date_gmt":"2018-10-16T16:22:30","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=623"},"modified":"2018-10-17T00:22:30","modified_gmt":"2018-10-16T16:22:30","slug":"chapter-17gate-design-overview","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/nb\/2018\/10\/17\/kapittel-17-oversikt-over-portdesign\/","title":{"rendered":"Kapittel 17,Oversikt over portdesign"},"content":{"rendered":"<h2>Hva er en port?<\/h2>\n<p>En port er en liten \u00e5pning (eller \u00e5pning) som polymersmelten kommer inn i hulrommet gjennom. Portdesign for en bestemt applikasjon omfatter valg av porttype, dimensjoner og plassering. Det avhenger av del- og formdesignet, delspesifikasjonene (f.eks. utseende, toleranse, konsentrisitet), materialtypen som st\u00f8pes, fyllstoffene, typen formplater og \u00f8konomiske faktorer (f.eks. verkt\u00f8ykostnader, syklustid, tillatt skrapvolum). Portdesignet er av stor betydning for kvaliteten og produktiviteten.<\/p>\n<h2>\u00c9n eller flere porter<\/h2>\n<p>Du vil vanligvis lykkes bedre med en enkelt port, med mindre lengden p\u00e5 smeltestr\u00f8mmen overskrider praktiske grenser. Flere grinder skaper alltid sveise- og smeltelinjer der smeltestr\u00f8mmene fra de separate grindene m\u00f8tes. Med unntak av lange, smale deler, vil en enkelt port inn i delens kropp (i motsetning til en kantport) sikre en jevnere fordeling av materiale, temperaturer og pakking, og bedre orienteringseffekter. Selv om en enkelt port i delens kropp kan medf\u00f8re h\u00f8yere verkt\u00f8ykostnader, vil lavere kassasjonsrater og h\u00f8yere delkvalitet raskt rettferdiggj\u00f8re denne kostnaden.<\/p>\n<h2>Dimensjoner p\u00e5 porten<\/h2>\n<p>Tverrsnittet p\u00e5 porten er vanligvis mindre enn tverrsnittet p\u00e5 delel\u00f8peren og delen, slik at delen enkelt kan \"de-gates\" (skilles fra l\u00f8peren) uten \u00e5 etterlate et synlig arr p\u00e5 delen. Portens tykkelse er vanligvis to tredjedeler av emnets tykkelse. Siden slutten p\u00e5 pakkingen kan identifiseres som det tidspunktet da materialet i porten faller under frysetemperaturen, styrer porttykkelsen pakketiden. En st\u00f8rre sluse vil redusere visk\u00f8s (friksjons-)oppvarming, tillate lavere hastigheter og h\u00f8yere pakketrykk over lengre tid. Velg en st\u00f8rre sluse hvis du \u00f8nsker \u00e5 oppn\u00e5 et godt utseende, lave restspenninger og bedre dimensjonsstabilitet.<\/p>\n<p>Figur 1 nedenfor illustrerer begrepene vi bruker for \u00e5 beskrive portst\u00f8rrelse.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1172\" title=\"porselen-mold-maker\" src=\"https:\/\/web.archive.org\/web\/20130131110946im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/09\/china-mold-maker.gif\" alt=\"Kina injeksjon mold selskap, Kina injeksjon mold produsent\" width=\"476\" height=\"277\" \/><\/p>\n<h2>Plassering av port<\/h2>\n<p>Velg en portplassering som sikrer rask og jevn fylling av formen. Plasser sveiselinjer og luft-\/gassventiler slik at de har minst mulig innvirkning p\u00e5 emnets utseende og styrke. Siden portene er steder med h\u00f8y restspenning, b\u00f8r de plasseres vekk fra omr\u00e5der som vil oppleve h\u00f8y ytre belastning under bruk.<\/p>\n<p>Plasser porten p\u00e5 avstand fra lastb\u00e6rende omr\u00e5der. Det h\u00f8ye smeltetrykket og den h\u00f8ye hastigheten p\u00e5 materialet som str\u00f8mmer gjennom porten, f\u00f8rer til at omr\u00e5det i n\u00e6rheten av porten utsettes for store belastninger.<\/p>\n<p>Plasser porten vekk fra omr\u00e5der med tynne snitt eller omr\u00e5der med plutselige tykkelsesendringer.<br \/>\nP\u00e5 den m\u00e5ten unng\u00e5r du hikke, synkemerker og hulrom.<\/p>","protected":false},"excerpt":{"rendered":"<p>What is a gate? A gate is a small opening (or orifice) through which the polymer melt enters the cavity. Gate design for a particular application includes selection of the gate type, dimensions,and location. It is dictated by the part and mold design, the part specifications (e.g.,appearance, tolerance, concentricity), the type of material being molded, [&hellip;]<\/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-623","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 17,Gate design overview - 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\/kapitola-17prehled-konstrukce-brany\/\" \/>\n<meta property=\"og:locale\" content=\"nb_NO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 17,Gate design overview - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"What is a gate? A gate is a small opening (or orifice) through which the polymer melt enters the cavity. Gate design for a particular application includes selection of the gate type, dimensions,and location. 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