{"id":8221,"date":"2021-06-29T16:19:19","date_gmt":"2021-06-29T14:19:19","guid":{"rendered":"https:\/\/blog.federnshop.com\/verifica-della-funzione-e-della-resistenza-delle-molle-a-compressione\/"},"modified":"2021-06-29T16:19:57","modified_gmt":"2021-06-29T14:19:57","slug":"verifica-della-funzione-e-della-resistenza-delle-molle-a-compressione","status":"publish","type":"post","link":"https:\/\/blog.federnshop.com\/it\/verifica-della-funzione-e-della-resistenza-delle-molle-a-compressione\/","title":{"rendered":"Verifica della funzione e della resistenza delle molle a compressione"},"content":{"rendered":"<p><span style=\"text-decoration: underline;\">Ogni modello di molla di una molla di compressione \u00e8 costituito da due fasi<\/span> :<br \/>\n1. La prova di funzionamento, con verifica delle dimensioni, elasticit\u00e0, forze, corsa della molla e comportamento alle vibrazioni.<br \/>\n2. La prova di resistenza, con la verifica del rispetto della sollecitazione ammissibile o della resistenza a fatica.<\/p>\n<h2><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-716 size-large\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/\/GF_Druckfedern_technisch-1024x663.jpg\" alt=\"Spiegazione della formula della molla di compressione\" width=\"700\" height=\"453\" data-wp-pid=\"716\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch-1024x663.jpg 1024w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch-300x194.jpg 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch-600x389.jpg 600w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch-200x130.jpg 200w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch-800x518.jpg 800w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/GF_Druckfedern_technisch.jpg 2001w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/h2>\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\/it\/verifica-della-funzione-e-della-resistenza-delle-molle-a-compressione\/#Prova_di_funzionamento\" >Prova di funzionamento<\/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\/it\/verifica-della-funzione-e-della-resistenza-delle-molle-a-compressione\/#Prova_di_forza\" >Prova di forza<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Prova_di_funzionamento\"><\/span>Prova di funzionamento<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Quanto segue si applica alle molle a compressione cilindriche in filo di sezione circolare.<\/p>\n<p><span style=\"text-decoration: underline;\">Indice di rigidezza<\/span> :<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8229 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federrate.png\" alt=\"Druckfeder Formel - Federrate\" width=\"155\" height=\"100\" data-wp-pid=\"737\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federrate.png 309w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federrate-300x194.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federrate-200x129.png 200w\" sizes=\"auto, (max-width: 155px) 100vw, 155px\" \/><\/p>\n<p style=\"text-align: left;\">da R = F\/s segue&#8230;<\/p>\n<p><span style=\"text-decoration: underline;\">Forza della molla<\/span> :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8227 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federkraft.png\" alt=\"Druckfeder Formel - Federkraft\" width=\"158\" height=\"100\" data-wp-pid=\"736\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federkraft.png 315w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federkraft-300x190.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federkraft-200x127.png 200w\" sizes=\"auto, (max-width: 158px) 100vw, 158px\" \/><\/p>\n<p>come &#8230;<\/p>\n<p><span style=\"text-decoration: underline;\">Corsa della sospensione<\/span> :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8230 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federweg.png\" alt=\"Druckfeder Formel - Federweg\" width=\"173\" height=\"100\" data-wp-pid=\"738\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federweg.png 345w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federweg-300x174.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Federweg-200x116.png 200w\" sizes=\"auto, (max-width: 173px) 100vw, 173px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Prova_di_forza\"><\/span>Prova di forza<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Dopo aver determinato le dimensioni della molla, \u00e8 necessario verificarne la resistenza. A tale scopo, viene determinata la tensione di taglio esistente.<\/p>\n<p><span style=\"text-decoration: underline;\">Tensione dalla forza<\/span> :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8232 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Kraft.png\" alt=\"Druckfeder Formel - Spannung aus Kraft\" width=\"152\" height=\"100\" data-wp-pid=\"740\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Kraft.png 303w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Kraft-300x198.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Kraft-200x132.png 200w\" sizes=\"auto, (max-width: 152px) 100vw, 152px\" \/><\/p>\n<p><span style=\"text-decoration: underline;\">Tensione fuori controllo<\/span> :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8233 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Weg.png\" alt=\"Druckfeder Formel - Spannung aus Weg\" width=\"158\" height=\"100\" data-wp-pid=\"741\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Weg.png 316w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Weg-300x190.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Spannung-aus-Weg-200x127.png 200w\" sizes=\"auto, (max-width: 158px) 100vw, 158px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Mentre la sollecitazione di taglio \u01ae viene utilizzata per la progettazione di molle caricate staticamente o quasi staticamente, la sollecitazione di taglio corretta \u01aek si applica alle molle caricate dinamicamente. La distribuzione dello sforzo di taglio nella sezione trasversale del filo di una molla non \u00e8 uniforme. La massima tensione si verifica sul diametro interno della molla. Con il fattore di correzione della tensione &#8220;k&#8221;, che dipende dal rapporto di avvolgimento (rapporto tra diametro medio &#8220;D&#8221; e dimensione del filo &#8220;d&#8221;) della molla, \u00e8 possibile determinare approssimativamente la tensione massima. Per molle sollecitate dinamicamente otteniamo:<\/p>\n<p><span style=\"text-decoration: underline;\">Sforzo di taglio corretto<\/span> : k = k \u00b7 \u01ae<\/p>\n<p>dove per k si applica (secondo Bergstr\u00e4\u00dfer):<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8231 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_K-Wert-Bergstraesser.png\" alt=\"Druckfeder Formel - k-Wert nach Bergstr\u00e4sser\" width=\"198\" height=\"180\" data-wp-pid=\"739\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_K-Wert-Bergstraesser.png 440w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_K-Wert-Bergstraesser-300x273.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_K-Wert-Bergstraesser-200x182.png 200w\" sizes=\"auto, (max-width: 198px) 100vw, 198px\" \/><\/p>\n<p>Ora il confronto viene effettuato con la tensione consentita. Questo \u00e8 definito come segue:<\/p>\n<p><span style=\"text-decoration: underline;\">Tensione ammissibile:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8234 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung.png\" alt=\"Druckfeder Formel - Zul\u00e4ssige Spannung\" width=\"178\" height=\"50\" data-wp-pid=\"742\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung.png 355w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-300x85.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-200x56.png 200w\" sizes=\"auto, (max-width: 178px) 100vw, 178px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-8235 aligncenter\" src=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-bei-Blocklaenge.png\" alt=\"Druckfeder Formel - Zul\u00e4ssige Spannung bei Blockl\u00e4nge\" width=\"203\" height=\"50\" data-wp-pid=\"743\" srcset=\"https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-bei-Blocklaenge.png 406w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-bei-Blocklaenge-300x74.png 300w, https:\/\/blog.federnshop.com\/wp-content\/uploads\/Druckfeder_Formel_Zulaessige-Spannung-bei-Blocklaenge-200x49.png 200w\" sizes=\"auto, (max-width: 203px) 100vw, 203px\" \/><\/p>\n<p>I valori per la resistenza a trazione minima Rm dipendono dallo spessore del filo e sono nelle norme di riferimento<a title=\"Federwerkstoffe\" href=\"https:\/\/blog.federnshop.com\/it\/proprieta-dellacciaio-per-molle\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Materiali<\/a> trovare. Di norma, deve essere possibile comprimere le molle di compressione fino alla lunghezza del blocco, motivo per cui deve essere presa in considerazione la tensione ammissibile per la lunghezza del blocco \u01aeczul. A<a href=\"https:\/\/blog.federnshop.com\/it\/tipi-di-molle-di-compressione-delle-sollecitazioni\/\" target=\"_blank\" rel=\"noopener noreferrer\"> stress dinamico<\/a> \u00e8 necessario determinare la tensione inferiore e superiore (\u01aek1 e \u01aek2) della corsa corrispondente. La differenza \u00e8 la tensione della corsa. Sia la tensione superiore che la tensione della corsa non devono superare i corrispondenti valori ammessi. Questi sono i diagrammi di resistenza a fatica del<a title=\"DIN EN 13906-1\" href=\"http:\/\/www.beuth.de\/de\/norm\/din-en-13906-1\/189797622\" target=\"_blank\" rel=\"noopener noreferrer\"> EN 13906-1<\/a> essere trovato, o in<a title=\"Druckfedernberechnung WinFSB\" href=\"https:\/\/www.federnshop.com\/de\/produkte\/druckfedern\/berechnung.html\" target=\"_blank\" rel=\"noopener noreferrer\"> Programma per il calcolo delle molle WinFSB<\/a> controllare (<a title=\"Lehrvideo Druckfedernberechnung mit WinFSB\" href=\"https:\/\/youtu.be\/EusjLYwYpLE\" target=\"_blank\" rel=\"noopener noreferrer\"> Calcolo della molla a compressione video con WinFSB<\/a> ). Se le tensioni resistono a questo confronto, la molla \u00e8 resistente alla fatica con un ciclo di carico limite di 10<sup> 7\u00b0<\/sup><\/p>","protected":false},"excerpt":{"rendered":"<p>Ogni modello di molla di una molla di compressione \u00e8 costituito da due fasi : 1. La prova di funzionamento, con verifica delle dimensioni, elasticit\u00e0, forze, corsa della molla e comportamento alle vibrazioni. 2. La prova di resistenza, con la<\/p>\n","protected":false},"author":4,"featured_media":3748,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[470,882,883,989],"tags":[2130,2127,1133,1821,636,2129,1504,803,580,1422,2128,581],"class_list":["post-8221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conoscenza","category-molle-a-filo","category-molle-di-compressione","category-servizio-it","tag-calcola-la-primavera","tag-comportamento-delle-vibrazioni","tag-dauerfestigkeit-it","tag-diagramma-di-goodman","tag-druckfedern-it","tag-fattore-di-correzione-dello-stress-k","tag-federauslegung-it","tag-federnberechnung-it","tag-festigkeitsnachweis-it","tag-indice-di-rigidezza","tag-prova-di-funzionamento","tag-schubspannung-it"],"_links":{"self":[{"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/posts\/8221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/comments?post=8221"}],"version-history":[{"count":1,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/posts\/8221\/revisions"}],"predecessor-version":[{"id":8495,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/posts\/8221\/revisions\/8495"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/media\/3748"}],"wp:attachment":[{"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/media?parent=8221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/categories?post=8221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.federnshop.com\/it\/wp-json\/wp\/v2\/tags?post=8221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}