{"id":5690,"date":"2024-11-13T18:34:10","date_gmt":"2024-11-13T16:34:10","guid":{"rendered":"https:\/\/blog.federnshop.com\/information-extension-springs\/"},"modified":"2024-11-14T18:15:44","modified_gmt":"2024-11-14T16:15:44","slug":"information-extension-springs","status":"publish","type":"post","link":"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/","title":{"rendered":"Information extension springs"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-5692 size-full\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Zugfedern.jpg\" alt=\"Extension springs Gutekunst springs\" width=\"600\" height=\"307\" data-wp-pid=\"1379\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Zugfedern.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Zugfedern-300x154.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Zugfedern-200x102.jpg 200w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Zugfedern-400x205.jpg 400w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Extension springs or helical tension springs absorb forces when they are pulled apart, which they release when they relax. Gutekunst Federn offers quick selection and procurement of<a href=\"https:\/\/www.federnshop.com\/en\/products\/extension_springs.html\" target=\"_blank\" rel=\"noopener noreferrer\"> extension springs in its catalog program<\/a> on<a href=\"https:\/\/www.federnshop.com\" target=\"_blank\" rel=\"noopener noreferrer\"> Federnshop.com<\/a> 4280 different sizes in mild steel EN 10270-1 and stainless steel EN 10270-3-1.4310 directly from stock. And if no suitable extension spring is available in the shop, then manufacture<a href=\"https:\/\/blog.federnshop.com\/en\/welcome-to-gutekunst-federn\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Gutekunst Springs<\/a> also any desired compression spring up to 12 mmm jet strength from the<a href=\"https:\/\/blog.federnshop.com\/en\/spring-steel-properties\/\" target=\"_blank\" rel=\"noopener noreferrer\"> various spring steels<\/a> in small quantities and large series.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Properties_of_extension_springs\" >Properties of extension springs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Spring_designs_and_loop_shapes\" >Spring designs and loop shapes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Preload\" >Preload<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Relaxation_shear_stress_and_spring_forces\" >Relaxation, shear stress and spring forces<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Advantages_of_extension_spring\" >Advantages of extension spring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Disadvantages_extension_spring\" >Disadvantages extension spring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/blog.federnshop.com\/en\/information-extension-springs\/#Offer_extension_springs\" >Offer extension springs<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Properties_of_extension_springs\"><\/span>Properties of extension springs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Extension springs are made from round or oval spring steel wires. Most of the spring steel wire is formed into any desired shape in the cold forming process, either by winding it around a mandrel with a one-finger system or, in the case of fully automatic spring winding machines, with the help of several wire guide pins (two-finger or three-finger system). The eyelets are either formed directly during the winding process or set up in a subsequent operation (<a href=\"https:\/\/www.youtube.com\/watch?v=XU-7SvpPsNQ\" target=\"_blank\" rel=\"noopener noreferrer\"> Video spring production at Gutekunst Springs<\/a> ). Extension springs are usually made cylindrical with a 1\/1 German eyelet on each side. The manufacturing tolerances are based on DIN 2097, from quality level 1 (smallest tolerance) to quality level 3 (largest tolerance). The calculation of the extension springs is based on the EN 13906-2 standard. Gutekunst provides his <a href=\"https:\/\/www.federnshop.com\/en\/service-and-informations\/metal-spring-calculation-to-din-13906.html\" target=\"_blank\" rel=\"noopener noreferrer\">spring calculation program WinFSB<\/a> for free. There is also one here<a href=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Gutekunst_Zugfedern_Formeln_2015.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"> Formula collection for extension spring calculation<\/a> .<\/p>\n<figure id=\"attachment_5696\" aria-describedby=\"caption-attachment-5696\" style=\"width: 155px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5696 size-full\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Haken_eingerollt.jpg\" alt=\"Hook rolled up\" width=\"155\" height=\"255\" data-wp-pid=\"1383\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Haken_eingerollt.jpg 155w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Haken_eingerollt-122x200.jpg 122w\" sizes=\"auto, (max-width: 155px) 100vw, 155px\" \/><figcaption id=\"caption-attachment-5696\" class=\"wp-caption-text\">Tapered end of spring<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Spring_designs_and_loop_shapes\"><\/span>Spring designs and loop shapes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Besides the<a href=\"https:\/\/blog.federnshop.com\/bauformen-metallfeden\/\"> cylindrical extension spring design<\/a> , with a linear spring characteristic, are also common<a href=\"https:\/\/blog.federnshop.com\/en\/design-spring-body\/\" target=\"_blank\" rel=\"noopener noreferrer\"> conical or barrel-shaped<\/a> Tension springs manufactured. With the conically tapered spring ends, in addition to a progressive spring characteristic, a longer service life is achieved. A degressive force curve cannot be generated via the tension spring design, this is only possible with a extension spring lever mechanism, such as. B. possible with a bed box. Come depending on the application<a href=\"https:\/\/blog.federnshop.com\/en\/eyelet-shapes-extension-springs\/\"> different loop shapes<\/a> for use. In addition to the classic loop shapes, such as the 1\/1 German loop or hook eye, more resistant spring ends, such as the<a href=\"https:\/\/blog.federnshop.com\/en\/eyelet-shapes-extension-springs\/\" target=\"_blank\" rel=\"noopener noreferrer\"> rolled up threaded bolts<\/a> or<a href=\"https:\/\/blog.federnshop.com\/en\/eyelet-shapes-extension-springs\/\" target=\"_blank\" rel=\"noopener noreferrer\"> screwed in threaded plugs<\/a> that allow a longer service life. With conical spring ends, a longer service life for extension springs can also be achieved. Basically, extension springs are not fatigue-resistant due to the eyelets, as the eyelet connection on the transition bend is a major weak point. That is why it should be ensured with tension springs that the force acts centrally on the loops, otherwise the risk of an loop breakage increases.<\/p>\n<figure id=\"attachment_5750\" aria-describedby=\"caption-attachment-5750\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-5750\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading.jpg\" alt=\"Loop loading - Gutekunst Springs\" width=\"600\" height=\"223\" data-wp-pid=\"5750\" data-pin-nopin=\"nopin\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading-300x112.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading-150x56.jpg 150w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading-400x149.jpg 400w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Loop-loading-200x74.jpg 200w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-5750\" class=\"wp-caption-text\">Loop loading<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Preload\"><\/span>Preload<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>After the extension spring has been coiled and the eyelet formed, tempering takes place in order to reduce the internal stresses in the spring and to increase the shear elastic limit. In the case of the extension spring, a twist against the next turn creates a prestress during manufacture. This bias is largely desired because it minimizes the required operating length of the extension spring. However, when producing extension springs, the higher the preload, the higher the production costs. If no preload is desired in a tension spring, such as. B. in the case of a range spring, this can be removed almost completely afterwards by increasing the tempering temperature and tempering time. Thermoformed extension springs do not contain any preload either. In order to be able to guarantee the required spring properties, such as structural dimensions or force properties after manufacture, the preload (F0) or the mean coil diameter (D) is normally tolerated as a production compensation.<\/p>\n<figure id=\"attachment_5701\" aria-describedby=\"caption-attachment-5701\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5701\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/\/Weg-Kraft-Diagramm_Zugfedern-1024x507.jpg\" alt=\"Distance-force diagram \/ spring characteristic of tension spring\" width=\"600\" height=\"297\" data-wp-pid=\"1393\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern-1024x507.jpg 1024w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern-300x149.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern-200x99.jpg 200w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern-600x297.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern-800x396.jpg 800w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Weg-Kraft-Diagramm_Zugfedern.jpg 1280w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption id=\"caption-attachment-5701\" class=\"wp-caption-text\">Distance-force diagram \/ spring characteristic of tension spring<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Relaxation_shear_stress_and_spring_forces\"><\/span>Relaxation, shear stress and spring forces<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In addition, with extension springs, as with all metal springs, a certain percentage of the spring force is lost if the spring is loaded over a longer period of time at higher temperatures. This loss of strength is called<a href=\"https:\/\/blog.federnshop.com\/en\/relaxation-for-springs\/\"> relaxation<\/a> , and it increases with increasing temperature and voltage. Since the relaxation, depending on the material and temperature, can mean a force loss of up to 20 percent, the greatest spring deflection should be a maximum of 80 percent of the permissible stress.<\/p>\n<figure id=\"attachment_5709\" aria-describedby=\"caption-attachment-5709\" style=\"width: 300px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-5709\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/\/Zugfestigkeit_Spannungs-Dehnungsdiagramm-300x281.jpg\" alt=\"Tensile strength stress-strain diagram\" width=\"300\" height=\"281\" data-wp-pid=\"940\" \/><figcaption id=\"caption-attachment-5709\" class=\"wp-caption-text\">Stress-strain diagram \/ \u00a9 Maschinenbau-Wissen.de<\/figcaption><\/figure>\n<p>Exceeds, when the extension spring is loaded, that<a href=\"https:\/\/blog.federnshop.com\/en\/schubspannung-berechnen-englisch\/\" target=\"_blank\" rel=\"noopener noreferrer\"> shear stress<\/a> the permissible value of the yield strength Rp, permanent reduced preload or deformation occurs. Furthermore, attention should be paid to the resonance vibration of the tension spring; ideally, the vibrations of the excitation frequency are ten times smaller than the natural frequency of the spring, otherwise considerable increases in stress can occur.<\/p>\n<p>The spring force \/ spring stiffness depends on the<a href=\"https:\/\/blog.federnshop.com\/en\/spring-steel-properties\/\"> spring steel wire<\/a> and the<a href=\"https:\/\/blog.federnshop.com\/en\/calculate-spring-rate-for-cylindrical-springs\/\"> spring rate<\/a> or.<a href=\"https:\/\/blog.federnshop.com\/en\/calculate-the-spring-constant\/\"> spring constant<\/a> from. The spring rate also defines the ratio of spring force to spring travel. Basically, the dimensioning of the spring force can be influenced by the following measures:<\/p>\n<p><strong>Wire diameter<\/strong> (d)<strong> greater<\/strong>&gt;<strong> spring harder<\/strong><br \/>\n<strong>Coil diameter<\/strong> (De)<strong> greater<\/strong>&gt;<strong> spring softer<\/strong><br \/>\n<strong>Number of spring coils<\/strong> (n)<strong> greater<\/strong>&gt;<strong> spring softer<\/strong><\/p>\n<p>The selection of the <a href=\"https:\/\/blog.federnshop.com\/en\/spring-steel-properties\/\">spring steel wire<\/a> not only influences the spring force, but also offers the right material properties for the various spring applications. In addition to normal unalloyed spring steel wires, stainless spring steels, SiCr-alloyed valve spring wires, copper alloys for good electrical properties, nickel alloys for high heat and corrosion resistance, and titanium alloys for the highest demands in aerospace engineering are used. In addition, various<a href=\"https:\/\/www.federnshop.com\/de\/service_informationen\/oberfl%C3%A4chenbehandlungen.html\" target=\"_blank\" rel=\"noopener noreferrer\"> surface treatments<\/a> can be applied to optimize the requirements of the spring. In the case of extension springs, however, the application of a surface treatment is many times more difficult, since the surface in the spaces between the coils lying next to one another can only be applied with great effort.<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/cqsZmGz7Tng\" width=\"400\" height=\"300\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Advantages_of_extension_spring\"><\/span>Advantages of extension spring<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The main advantages of the extension spring are the freedom from kinks, the possibility of central power transmission and the freedom from friction due to the elimination of guide elements such as sleeves or mandrels.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Disadvantages_extension_spring\"><\/span>Disadvantages extension spring<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The disadvantages of the extension spring are the size of the installation space, the sensitive point at the eyelet connection and the resulting total loss of spring force after an loop break.<\/p>\n<p>Sometimes extension spring systems with several tension springs are also used. The most common application example are garage door spring assemblies connected in parallel in order to hold components with a larger mass in position with constant forces and spring moments.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Offer_extension_springs\"><\/span>Offer extension springs<strong><br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/blog.federnshop.com\/en\/welcome-to-gutekunst-federn\/\" target=\"_blank\" rel=\"noopener noreferrer\">Gutekunst Springs<\/a> offers<a href=\"https:\/\/www.federnshop.com\/en\/products\/extension_springs.html\" target=\"_blank\" rel=\"noopener noreferrer\"> extension spring springs in 4280 different sizes<\/a> directly from stock or individually manufactured from the<a href=\"https:\/\/blog.federnshop.com\/en\/spring-steel-properties\/\" target=\"_blank\" rel=\"noopener noreferrer\"> various spring steels<\/a> Up to 12 mm wire thickness in small quantities and large series. <a href=\"https:\/\/www.federnshop.com\/en\/products\/extension_springs.html\" target=\"_blank\" rel=\"noopener noreferrer\">You can find the tension spring shop here<\/a> . For an individual and non-binding extension spring offer, please send the required spring data to<a href=\"mailto:service@gutekunst-co.com\"> service@gutekunst-co.com<\/a> or contact our quotation department directly at (+49) 07123 960-197.<\/p>\n<p><em>Related Links:<\/em><\/p>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/en\/products\/extension_springs.html\" target=\"_blank\" rel=\"noopener noreferrer\">Extension spring catalog with 4280 sizes from stock<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/en\/metal-spring-calculation-selection.html\" target=\"_blank\" rel=\"noopener noreferrer\">Spring calculation program WinFSB<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/en\/products\/extension_springs\/springs-inquiry.html\" target=\"_blank\" rel=\"noopener noreferrer\">Extension spring request<\/a><\/li>\n<\/ul>\n<ul>\n<li><a href=\"https:\/\/www.federnshop.com\/en\/service-and-informations\/technical-advice.html\" target=\"_blank\" rel=\"noopener noreferrer\">Technical support<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Extension springs or helical tension springs absorb forces when they are pulled apart, which they release when they relax. Gutekunst Federn offers quick selection and procurement of extension springs in its catalog program on Federnshop.com 4280 different sizes in mild<\/p>\n","protected":false},"author":4,"featured_media":5691,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[860,456,857],"tags":[1206,1196,1204,1203,1223,1198,1200,1192,1194,440,438],"class_list":["post-5690","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-extension-springs","category-products","category-wire-springs","tag-elongation-limit-en","tag-extension-spring-calculation","tag-extension-spring-catalog","tag-extension-spring-systems-en","tag-extension-springs","tag-loop-shapes","tag-preload","tag-relaxation-en","tag-special-springs","tag-spring-constant","tag-tension-springs"],"_links":{"self":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/5690","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/comments?post=5690"}],"version-history":[{"count":10,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/5690\/revisions"}],"predecessor-version":[{"id":11592,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/posts\/5690\/revisions\/11592"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/media\/5691"}],"wp:attachment":[{"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/media?parent=5690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/categories?post=5690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.federnshop.com\/en\/wp-json\/wp\/v2\/tags?post=5690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}