{"id":592,"date":"2026-01-05T15:02:24","date_gmt":"2026-01-05T15:02:24","guid":{"rendered":"https:\/\/sjnbcasting.com\/?p=592"},"modified":"2026-01-05T15:02:58","modified_gmt":"2026-01-05T15:02:58","slug":"what-is-the-manufacturing-process-of-cores-in-sand-casting","status":"publish","type":"post","link":"https:\/\/sjnbcasting.com\/sv\/what-is-the-manufacturing-process-of-cores-in-sand-casting\/","title":{"rendered":"Hur ser tillverkningsprocessen f\u00f6r k\u00e4rnor vid sandgjutning ut?"},"content":{"rendered":"<h2>1. Introduktion till k\u00e4rnor<\/h2>\n<p>I <a href=\"https:\/\/sjnbcasting.com\/sv\/process\/\">sandgjutningsprocess<\/a>, cores are an independent sand &#8211; based forming component, mainly used to form specific cavities, holes or complex structures inside castings. It is used in conjunction with the external sand mold (mold) to form a complete casting cavity, ensuring that the liquid metal can form an internal shape that meets the design requirements after solidification. The core is one of the core technologies to solve the forming problems of complex &#8211; structure castings.<\/p>\n<p>K\u00e4rnans huvudsakliga funktion \u00e4r att forma gjutgodsets inre h\u00e5lrum. Den kan anv\u00e4ndas f\u00f6r att tillverka r\u00f6r, olika h\u00e5l (till exempel vatten- och oljekanaler i motorcylindrar), blindh\u00e5l och andra strukturer som inte kan formas direkt med hj\u00e4lp av yttre formar. Samtidigt kan den skapa komplexa geometriska former och m\u00f6jligg\u00f6ra formning av exakta inre strukturer, s\u00e5som vevhusets vevstangskanaler och turbinbladens kylkanaler. Dessutom kan k\u00e4rnan minska skillnaden i v\u00e4ggtjocklek hos gjutgods, undvika defekter i form av \u201dhot spots\u201d orsakade av oj\u00e4mn lokal v\u00e4ggtjocklek, samt styra fl\u00f6desriktningen f\u00f6r sm\u00e4lt metall, optimera fyllningseffekten och f\u00f6rb\u00e4ttra gjutkvaliteten.<\/p>\n<h2>2. Typiska prestandakrav f\u00f6r k\u00e4rnor<\/h2>\n<ul>\n<li>H\u00f6g h\u00e5llfasthet: Den m\u00e5ste t\u00e5la st\u00f6tar fr\u00e5n sm\u00e4lt metall (till exempel kan st\u00f6tkraften vid gjutning av gjutj\u00e4rn uppg\u00e5 till 0,3 MPa) f\u00f6r att s\u00e4kerst\u00e4lla att den inte spricker under gjutningsprocessen.<\/li>\n<li>Good Air Permeability: It must be able to discharge gas smoothly in a high &#8211; temperature environment, and the air permeability index must be \u2265100cm\u00b3\/(cm\u00b2\u00b7min).<\/li>\n<li>Enkel nedbrytbarhet: Efter gjutningen m\u00e5ste formen kunna brytas ned genom vibrationer eller kemisk p\u00e5verkan f\u00f6r att underl\u00e4tta efterf\u00f6ljande sandreng\u00f6ring, och resth\u00e5llfastheten m\u00e5ste vara &lt; 0,5 MPa.<\/li>\n<li>H\u00f6g precision: M\u00e5tttoleransen f\u00f6r viktiga komponenter m\u00e5ste h\u00e5llas inom gr\u00e4nserna f\u00f6r klass CT8 (\u00b10,25 mm).<\/li>\n<\/ul>\n<h2>3. Tillverkningsprocessen f\u00f6r k\u00e4rnor<\/h2>\n<h3>(1) Formningsteknik<\/h3>\n<ul>\n<li>K\u00e4rnsprutningsmetod: Den blandade sanden sprutas in i k\u00e4rnl\u00e5dan med h\u00f6g hastighet via en k\u00e4rnsprutningsmaskin, och k\u00e4rnan lossas ur formen efter h\u00e4rdning. Denna metod har h\u00f6g produktionseffektivitet, upp till 120 formar per timme, och l\u00e4mpar sig f\u00f6r massproduktion av standardiserade k\u00e4rnor.<\/li>\n<li>3D Printing Method: Adhesive Jetting technology is used to directly print complex cores with a forming accuracy of up to \u00b10.3mm. No core box is required, which is suitable for the rapid manufacturing of small &#8211; batch and complex &#8211; structure cores.<\/li>\n<li>Cold Box-metoden: Trietylamin anv\u00e4nds som katalysator f\u00f6r att f\u00e5 hartset att h\u00e4rda vid rumstemperatur. Efter formningen uppg\u00e5r k\u00e4rnans ytj\u00e4mnhet Ra till \u226412,5 \u03bcm, vilket ger b\u00e5de h\u00f6g effektivitet och h\u00f6g precision.<\/li>\n<\/ul>\n<h3>(2) Post &#8211; treatment Process<\/h3>\n<ul>\n<li>Drying: The resin sand core needs to be baked at a temperature of 200 &#8211; 250\u2103 for 2 &#8211; 4 hours to remove the moisture inside the core and improve the strength and stability of the core.<\/li>\n<li>Coating: The surface of the core is dipped with zircon powder coating, and the coating thickness is controlled at 0.2 &#8211; 0.5mm, which can significantly improve the high &#8211; temperature resistance of the core and prevent sand sticking defects during pouring.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/sjnbcasting.com\/sv\/solution\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-560 size-full\" src=\"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg\" alt=\"What is the Manufacturing Process of Cores in Sand Casting?\" width=\"800\" height=\"500\" srcset=\"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg 800w, https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes-480x300.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/a><\/p>\n<h2>4. R\u00e5varor och tillverkningsmetoder f\u00f6r k\u00e4rnor<\/h2>\n<p>R\u00e5materialen i k\u00e4rnan \u00e4r vanligtvis desamma som i den hartsand som anv\u00e4nds i <a href=\"https:\/\/sjnbcasting.com\/sv\/process\/\">gjutningsprocess<\/a>. During production, the resin sand is filled into the core box matching the internal shape of the casting. According to the technical capabilities and equipment conditions of the production enterprise, the sand can be formed in the core box by compaction, heating or sand blowing. Then the core is taken out of the core box and can be put into the mold for use after post &#8211; treatment.<br \/>\nDet finns tv\u00e5 huvudsakliga tillverkningsmetoder f\u00f6r k\u00e4rnor: varml\u00e5dsmetoden och kalll\u00e5dsmetoden:<\/p>\n<ul>\n<li>Hot Box-metoden: En katalysator tills\u00e4tts till hartsand, och katalysatorn aktiveras genom uppv\u00e4rmning av k\u00e4rnl\u00e5dan f\u00f6r att p\u00e5skynda h\u00e4rdningen och formningen av hartsanden.<\/li>\n<li>Cold Box-metoden: Man anv\u00e4nder en katalysator som kan aktiveras utan uppv\u00e4rmning. N\u00e4r hartset och sanden blandas aktiveras katalysatorn automatiskt, vilket g\u00f6r att sandk\u00e4rnan h\u00e4rdar och tar form vid rumstemperatur.<\/li>\n<\/ul>\n<h2>5. F\u00e4stmetoder f\u00f6r k\u00e4rnor<\/h2>\n<p>Under gjutningsprocessen, n\u00e4r det sm\u00e4lta metallen sprutas in i formen, kommer det att sl\u00e5 emot och trycka upp k\u00e4rnan, vilket g\u00f6r att k\u00e4rnan l\u00e4tt kan f\u00f6rskjutas eller flyta upp. D\u00e4rf\u00f6r m\u00e5ste en l\u00e4mplig f\u00e4stmetod anv\u00e4ndas:<\/p>\n<ul>\n<li>F\u00e4stmetod f\u00f6r k\u00e4rnh\u00e5llare: K\u00e4rnh\u00e5llaren \u00e4r tillverkad av samma metall som formen och h\u00e5ller k\u00e4rnan p\u00e5 plats i den avsedda positionen i formen tills gjutningen av sm\u00e4ltmetallen \u00e4r avslutad och har svalnat. Efter avkylningen blir den del av k\u00e4rnh\u00e5llaren som varit i kontakt med sm\u00e4ltmetallen en del av gjutgodset. N\u00e4r gjutningen har formats kollapsar k\u00e4rnan och tas ut genom vibration.<\/li>\n<li>Metod f\u00f6r f\u00f6rl\u00e4ngd k\u00e4rnfixering: Om gjutgodset har ett utrymme utanf\u00f6r formens ytterv\u00e4gg som inte kan fyllas med metall, kan k\u00e4rnan g\u00f6ras l\u00e4ngre \u00e4n formen och f\u00e4stas i det sp\u00e5r som finns i sandformen f\u00f6r att f\u00f6rhindra att den r\u00f6r sig under gjutningen.<\/li>\n<\/ul>\n<p>Core technology is the core means for sand casting to realize the production of castings with complex internal cavity structures. Its development process has continuously promoted the progress of the casting industry, from traditional manual core making to intelligent 3D printing core making. In the future, with the in &#8211; depth application of bionic structure design (such as topology &#8211; optimized honeycomb cores) and digital twin technology, cores will play a more important role in realizing casting lightweight and functional integration, providing strong support for the high &#8211; quality development of the casting industry.<\/p>\n<p>Om du vill veta mer om k\u00e4rnor vid sandgjutning \u00e4r du v\u00e4lkommen att kontakta oss.<\/p>","protected":false},"excerpt":{"rendered":"<p>1. Introduction to Cores In the sand casting process, cores are an independent sand &#8211; based forming component, mainly used to form specific cavities, holes or complex structures inside castings. It is used in conjunction with the external sand mold (mold) to form a complete casting cavity, ensuring that the liquid metal can form an [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":560,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-592","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry"],"jetpack_featured_media_url":"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2025\/12\/Suijin-Wet-Sand-Casting-Processes.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/posts\/592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/comments?post=592"}],"version-history":[{"count":4,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/posts\/592\/revisions"}],"predecessor-version":[{"id":596,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/posts\/592\/revisions\/596"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/media\/560"}],"wp:attachment":[{"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/media?parent=592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/categories?post=592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sjnbcasting.com\/sv\/wp-json\/wp\/v2\/tags?post=592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}