{"id":9460,"date":"2019-06-24T09:33:51","date_gmt":"2019-06-24T07:33:51","guid":{"rendered":"https:\/\/www.lesjoforsab.com\/about-lesjofors\/news\/fjadrar-for-fordonsindustrin-ett-vetenskapsomrade-byggt-pa-tre-hornstenar\/"},"modified":"2020-05-12T21:43:15","modified_gmt":"2020-05-12T19:43:15","slug":"fordonsfjadrar-en-hel-vetenskap-byggd-pa-tre-hornstenar","status":"publish","type":"post","link":"https:\/\/www.lesjoforsab.com\/sv\/om-lesjofors\/nyheter\/fordonsfjadrar-en-hel-vetenskap-byggd-pa-tre-hornstenar\/","title":{"rendered":"Fordonsfj\u00e4drar \u2013 en hel vetenskap byggd p\u00e5 tre h\u00f6rnstenar"},"content":{"rendered":"\n<p><strong>Herrljunga, Sverige<\/strong> &#8211; Hos Lesj\u00f6fors Industrifj\u00e4drar i Hudene i V\u00e4sterg\u00f6tland tillverkas bland annat specialanpassade ventilfj\u00e4drar f\u00f6r trimmade motorer. \u00d6hlins Racing \u00e4r en v\u00e4lk\u00e4nd kund, d\u00e4r Lesj\u00f6fors levererat fj\u00e4drar till st\u00f6td\u00e4mpare i \u00f6ver 20 \u00e5r. Med en kundbas d\u00e4r extrema krav st\u00e4lls p\u00e5 fj\u00e4drarna \u2013 g\u00e4llande s\u00e5v\u00e4l toleranser, finish som prestanda &#8211; g\u00e4ller det att ligga i yttersta framkant f\u00f6r att beh\u00e5lla och utveckla aff\u00e4ren. <\/p>\n\n\n\n<p><strong>Stefan Musslinder<\/strong> \u00e4r teknisk chef f\u00f6r Lesj\u00f6forskoncernen och ber\u00e4ttar om vad som kr\u00e4vs f\u00f6r att vara framg\u00e5ngsrik i branschen.<br><em>\u2013 En fj\u00e4ders egenskaper bygger p\u00e5 tre faktorer; material, tillverkningsprocess och konstruktion. Genom djuplodande kunskaper inom alla tre omr\u00e5den kan vi uppfylla den specifikation vi f\u00e5r fr\u00e5n kunden.<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Den \u00f6nskade funktionen best\u00e4mmer konstruktion och material<\/h4>\n\n\n\n<p>Att k\u00e4nna till ett materials natur och fr\u00e5n det ber\u00e4kna tr\u00e5ddiameter och antal lindningar \u00e4r grundl\u00e4ggande f\u00f6r utformningen av en optimal fj\u00e4der. Det finns ett stort utbud av material f\u00f6r olika applikationer. Fj\u00e4derst\u00e5l \u00e4r bland de h\u00e5rdaste st\u00e5lmaterial som finns, vilket \u00e4r n\u00f6dv\u00e4ndigt f\u00f6r att motst\u00e5 de h\u00f6ga mekaniska p\u00e5frestningar som uppst\u00e5r i fj\u00e4drarna p\u00e5 ett fordon. De st\u00e4ndigt \u00f6kande kraven p\u00e5 l\u00e5g vikt och litet inbyggt utrymme inneb\u00e4r att fj\u00e4drarna m\u00e5ste uth\u00e4rda enorma p\u00e5frestningar.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Funktion styr konstruktion och material<\/h4>\n\n\n\n<p>Att k\u00e4nna till ett materials karakt\u00e4r och utifr\u00e5n det r\u00e4kna ut tr\u00e5ddiameter och antal lindningsvarv \u00e4r grundl\u00e4ggande f\u00f6r en optimal fj\u00e4der. Det finns en stor m\u00e4ngd material att v\u00e4lja p\u00e5 f\u00f6r olika anv\u00e4ndningsomr\u00e5den. Fj\u00e4derst\u00e5l \u00e4r bland de h\u00e5rdaste st\u00e5lsorter som finns, vilket kr\u00e4vs f\u00f6r att klara de enorma mekaniska sp\u00e4nningar som uppst\u00e5r i fj\u00e4drarna i ett fordon. De st\u00e4ndigt \u00f6kande kraven p\u00e5 l\u00e5g vikt och litet inbyggnadsutrymme inneb\u00e4r att fj\u00e4drarna m\u00e5ste t\u00e5la h\u00f6gre sp\u00e4nningar.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Processer f\u00f6r h\u00e5llfasthet<\/h4>\n\n\n\n<p>Tillverkningsprocessen \u00e4r minst lika viktig som materialet, d\u00e5 egenskaper skr\u00e4ddarsys genom olika behandlingar. Efter lindningen v\u00e4rmebehandlas fj\u00e4drarna i 200\u2013450 grader beroende p\u00e5 materialsort och typen av fj\u00e4derapplikation. I denna s\u00e5 kallade sp\u00e4nningsanl\u00f6pning sl\u00e4pper de inre sp\u00e4nningarna fr\u00e5n lindningen. Slipning \u00e4r den process som f\u00f6ljer i de fall \u00e4ndytorna ska vara plana, vilket egentligen \u00e4r ett grundkrav f\u00f6r alla tryckfj\u00e4drar men f\u00f6r enklare fj\u00e4derapplikationer avst\u00e5r man ibland fr\u00e5n denna process av kostnadssk\u00e4l.<\/p>\n\n\n\n<p>F\u00f6r fj\u00e4drar som ska \u00f6verleva ett stort antal belastningsv\u00e4xlingar under sin livsl\u00e4ngd \u2013 t ex ventilfj\u00e4drarna i en f\u00f6rbr\u00e4nningsmotor &#8211; \u00e4r kulbombning en viktig och kritisk process. Genom att bombardera ytan med sm\u00e5, h\u00e5rda st\u00e5lkulor f\u00e5r man in trycksp\u00e4nningar i materialets ytskikt. Kulbombningen kan \u00f6ka utmattningsh\u00e5llfastheten med upp till 50 g\u00e5nger.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Utveckling av ber\u00e4kningsmodeller<\/h4>\n\n\n\n<p>Sista steget \u2013 innan eventuell ytbehandling, m\u00e4rkning etc &#8211; \u00e4r f\u00f6rs\u00e4ttning, d\u00e5 fj\u00e4dern trycks ihop maximalt tv\u00e5 till tre g\u00e5nger f\u00f6r att den ska s\u00e4tta sig. H\u00e4rigenom uppn\u00e5s inre sp\u00e4nningar i materialet i motsatt riktning mot de belastningssp\u00e4nningar som fj\u00e4dern normalt har vid anv\u00e4ndning. Eftersom fj\u00e4dern blir kortare n\u00e4r den f\u00f6rs\u00e4tts, kr\u00e4vs att konstrukt\u00f6ren kan r\u00e4kna ut hur l\u00e5ng den beh\u00f6ver vara vid lindningen.<\/p>\n\n\n\n<p><em>\u2013<\/em> <em>Ber\u00e4kningsmodellen har vi f\u00e5tt utveckla sj\u00e4lva, d\u00e5 fj\u00e4deromr\u00e5det i princip \u00e4r en vit fl\u00e4ck inom den akademiska forskningen idag. F\u00f6r att kunna ta fram de optimala fj\u00e4drarna beh\u00f6ver vi utveckla den teknik vi beh\u00f6ver f\u00f6r att vara marknadsledande,<\/em> s\u00e4ger <strong>Stefan Musslinder.<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Enorma p\u00e5frestningar p\u00e5 ventilfj\u00e4drar<\/h4>\n\n\n\n<p>F\u00f6r den s\u00e4rskilt utsatta ventilfj\u00e4dern som uts\u00e4tts f\u00f6r rigor\u00f6sa p\u00e5frestningar, s\u00e4rskilt i trimmade motorer, kr\u00e4vs ibland ytterligare \u00e5tg\u00e4rder f\u00f6r att klara h\u00e5llfastheten. H\u00e4r arbetar man ofta med fj\u00e4dersatser d\u00e4r tv\u00e5 eller tre ventilfj\u00e4drar monteras koncentriskt i varandra och som d\u00e4rigenom minskar belastningen p\u00e5 den enskilda fj\u00e4dern. Det \u00e4r en ypperlig l\u00f6sning p\u00e5 den begr\u00e4nsade yta som finns d\u00e4r fj\u00e4dern ska arbeta.<\/p>\n\n\n\n<p><em>\u2013 Kraven \u00e4r h\u00e5rda rakt igenom; fr\u00e5n processer som ska h\u00e5lla st\u00e5let rent, till ytbehandling, anl\u00f6pning, slipning och kulbombning. Sedan varmf\u00f6rs\u00e4tts ventilfj\u00e4dern f\u00f6r att klara hettan i den milj\u00f6 d\u00e4r den sedan ska verka<\/em>, avslutar <strong>Stefan Musslinder.<\/strong> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Material. Tillverkningsprocess. Konstruktion. Hur dessa tre faktorer samverkar \u00e4r avg\u00f6rande f\u00f6r en fj\u00e4ders egenskaper. Forskning inom omr\u00e5det finns inte i Sverige s\u00e5 Lesj\u00f6fors utvecklar sj\u00e4lva den kunskap som beh\u00f6vs f\u00f6r att ta fram fordonsfj\u00e4drar som klarar de tuffaste kraven.<\/p>\n","protected":false},"author":9,"featured_media":10830,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-9460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-sv"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Lesj\u00f6fors - Springs and Pressings<\/title>\n<meta name=\"description\" content=\"Lesj\u00f6fors \u00e4r en av v\u00e4rldens st\u00f6rsta tillverkare inom idustrifj\u00e4drar och banddetaljer.\" \/>\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.lesjoforsab.com\/sv\/om-lesjofors\/nyheter\/fordonsfjadrar-en-hel-vetenskap-byggd-pa-tre-hornstenar\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lesj\u00f6fors - 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