{"id":8393,"date":"2026-05-23T17:33:51","date_gmt":"2026-05-23T09:33:51","guid":{"rendered":"https:\/\/dinglidiespring.com\/?p=8393"},"modified":"2026-05-23T17:33:54","modified_gmt":"2026-05-23T09:33:54","slug":"estimating-die-spring-fatigue-life-tooling-run","status":"publish","type":"post","link":"https:\/\/dinglidiespring.com\/fr\/estimating-die-spring-fatigue-life-tooling-run\/","title":{"rendered":"Estimation de la dur\u00e9e de vie en fatigue des ressorts de matrice avant de lancer une production d&#039;outillage"},"content":{"rendered":"<p class=\"wp-block-paragraph\">La dur\u00e9e de vie en fatigue des ressorts de matrice est l&#039;une de ces donn\u00e9es que les acheteurs aimeraient pouvoir consulter directement. Le catalogue indique un million de cycles pour une charge l\u00e9g\u00e8re, plusieurs centaines de milliers pour une charge lourde, et le projet passe \u00e0 l&#039;\u00e9tape suivante. Puis, l&#039;outil entre en production, les ressorts commencent \u00e0 casser pr\u00e9matur\u00e9ment, et l&#039;\u00e9quipe se retrouve \u00e0 d\u00e9battre\u00a0: le catalogue \u00e9tait-il erron\u00e9 ou l&#039;application \u00e9tait-elle hors limites\u00a0?.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-1024x538.webp\" alt=\"Ressort de matrice fractur\u00e9 avec spires d&#039;extr\u00e9mit\u00e9 cass\u00e9es illustrant une rupture par fatigue apr\u00e8s d\u00e9passement de la dur\u00e9e de vie nominale\" class=\"wp-image-8395\" srcset=\"https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-1024x538.webp 1024w, https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-300x158.webp 300w, https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-768x403.webp 768w, https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-18x9.webp 18w, https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714-600x315.webp 600w, https:\/\/dinglidiespring.com\/wp-content\/uploads\/2026\/05\/Fractured-Die-Spring-Showing-End-Coil-Fatigue-Failure-1779528714.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le plus souvent, aucune des deux options n&#039;est totalement fausse. Le num\u00e9ro de cycle du catalogue sert de r\u00e9f\u00e9rence sous des hypoth\u00e8ses de d\u00e9flexion sp\u00e9cifiques, et l&#039;application est rarement identique \u00e0 ces hypoth\u00e8ses. Avant de finaliser la production d&#039;un outillage, il est plus pertinent de se demander si l&#039;estimation de la dur\u00e9e de vie correspond \u00e0 l&#039;utilisation r\u00e9elle du ressort.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si vous h\u00e9sitez encore entre les normes et les niveaux de charge, il est utile de commencer par revoir les principes de base. <a href=\"https:\/\/dinglidiespring.com\/fr\/products\/die-springs\/\">ressorts de matrice<\/a> page et alignement sur la couleur ou la classe de chargement dont le projet a r\u00e9ellement besoin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi les num\u00e9ros de cycle de catalogue ne sont-ils pas correctement transf\u00e9r\u00e9s vers votre outil ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les valeurs de cycle indiqu\u00e9es dans les catalogues de ressorts de matrice sont g\u00e9n\u00e9ralement bas\u00e9es sur des hypoth\u00e8ses concernant le pourcentage de fl\u00e8che \u00e0 l&#039;installation, l&#039;alignement, le contact des spires d&#039;extr\u00e9mit\u00e9 et des conditions de fonctionnement optimales. Dans la pratique, il est rare que ces quatre conditions soient r\u00e9unies simultan\u00e9ment dans les projets d&#039;outillage.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La d\u00e9flexion est souvent pouss\u00e9e \u00e0 des valeurs sup\u00e9rieures au pourcentage nominal car les concepteurs souhaitent utiliser moins de ressorts ou des ressorts plus courts.<\/li>\n\n\n\n<li>L&#039;alignement peut \u00eatre acceptable sur le plan, mais compromis lors de l&#039;installation r\u00e9elle.<\/li>\n\n\n\n<li>Les extr\u00e9mit\u00e9s des bobines peuvent frotter contre des surfaces d&#039;assise rugueuses ou irr\u00e9guli\u00e8res.<\/li>\n\n\n\n<li>Les conditions de fonctionnement peuvent inclure la chaleur, la contamination ou un lubrifiant, des \u00e9l\u00e9ments que le catalogue n&#039;a jamais pris en compte.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Chacun de ces facteurs r\u00e9duit discr\u00e8tement le nombre de cycles effectifs. Aucun n&#039;est inhabituel\u00a0; ils s&#039;accumulent simplement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Que signifie r\u00e9ellement \u201c dur\u00e9e de vie en fatigue \u201d dans le contexte d&#039;un ressort de crevaison ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pour un ressort de matrice, la dur\u00e9e de vie en fatigue ne se limite pas \u00e0 la dur\u00e9e avant rupture. Elle correspond g\u00e9n\u00e9ralement au nombre de cycles avant que le ressort ne perde une longueur libre ou une charge d\u00e9finie. Lorsqu&#039;un ressort se rompt visiblement, il a souvent fonctionn\u00e9 en de\u00e7\u00e0 des sp\u00e9cifications pendant des milliers de cycles. C&#039;est pourquoi un outil peut produire des pi\u00e8ces d&#039;apparence acceptable alors que les ressorts pr\u00e9sentent d\u00e9j\u00e0 une d\u00e9formation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une r\u00e9flexion pertinente sur la dur\u00e9e de vie des services englobe trois aspects, et non un seul\u00a0:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Nombre de cycles pour la perte de charge<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est ce qui importe g\u00e9n\u00e9ralement \u00e0 un acheteur lorsqu\u2019il planifie le remplacement d\u2019un ressort, car la presse commence \u00e0 se comporter diff\u00e9remment avant m\u00eame toute d\u00e9faillance visible.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Nombre de cycles jusqu&#039;\u00e0 perte de longueur libre<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La d\u00e9rive de longueur libre modifie la pr\u00e9charge et le jeu. La presse peut continuer \u00e0 fonctionner, mais les tol\u00e9rances de la pi\u00e8ce form\u00e9e commencent \u00e0 \u00e9voluer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Nombre de cycles jusqu&#039;\u00e0 la fracture<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La rupture est le pire des sc\u00e9narios et souvent le dernier \u00e9v\u00e9nement survenant. Il est dangereux de dimensionner les intervalles de remplacement en fonction de la rupture\u00a0; il convient plut\u00f4t de les d\u00e9finir en fonction de la charge et de la d\u00e9rive longitudinale.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment utiliser les codes couleur et charger des classes sans leur accorder une confiance excessive ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La plupart des codes couleur des ressorts de matrice correspondent \u00e0 une classe de charge\u00a0: l\u00e9g\u00e8re, moyenne, lourde, tr\u00e8s lourde, etc. Ils sont pratiques pour s\u2019y retrouver, mais ils d\u00e9crivent le niveau de contrainte et non la dur\u00e9e de vie absolue. Deux ressorts de m\u00eame couleur peuvent pr\u00e9senter des nombres de cycles tr\u00e8s diff\u00e9rents selon leur d\u00e9formation lors de l\u2019installation et leurs conditions d\u2019utilisation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une m\u00e9thode pratique pour utiliser les codes couleur dans la planification de la gestion de la fatigue\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Consid\u00e9rez la couleur comme un facteur de stress, et non comme une garantie de vie.<\/li>\n\n\n\n<li>Choisissez une classe dont l&#039;enveloppe de d\u00e9viation correspond \u00e0 la course r\u00e9elle, et non \u00e0 la course maximale sur le papier.<\/li>\n\n\n\n<li>Si la conception impose une forte d\u00e9formation, il vaut mieux opter pour une classe inf\u00e9rieure plut\u00f4t que de forcer la classe existante.<\/li>\n\n\n\n<li>Confirmez la correspondance entre les couleurs et les classes avec le fournisseur, car les normes et les marques ne concordent pas toujours.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Pour en savoir plus sur les crit\u00e8res qui sous-tendent ces classes, consultez l&#039;article sur <a href=\"https:\/\/dinglidiespring.com\/fr\/products\/die-springs\/\">gamme de produits \u00e0 ressorts de matrice<\/a> est un bon point de d\u00e9part.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi un essai sur \u00e9chantillon n&#039;est pas un v\u00e9ritable test de fatigue<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Il est courant d&#039;installer un petit lot de ressorts, d&#039;effectuer quelques milliers de cycles, de ne constater aucun probl\u00e8me et de consid\u00e9rer cela comme une confirmation. C&#039;est l&#039;une des erreurs les plus co\u00fbteuses en mati\u00e8re d&#039;outillage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un essai sur un petit \u00e9chantillon permet g\u00e9n\u00e9ralement de confirmer la compatibilit\u00e9 du ressort. Il ne permet pas de prouver son comportement en fatigue, car\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La majeure partie de la d\u00e9gradation par fatigue n&#039;est pas visible lors des premiers milliers de cycles.<\/li>\n\n\n\n<li>La perte de charge est progressive et n&#039;a de sens que si elle est mesur\u00e9e avant et apr\u00e8s.<\/li>\n\n\n\n<li>Les effets thermiques, la contamination et l&#039;alignement des bords s&#039;accumulent sur les longues s\u00e9ries.<\/li>\n\n\n\n<li>Une presse fonctionnant lentement dans des conditions d&#039;essai ne correspond pas au rythme de production.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Si le projet exige une r\u00e9elle confiance dans la dur\u00e9e de vie, il est plus utile d&#039;instrumenter une conduite plus longue et de mesurer la longueur libre et la charge \u00e0 intervalles planifi\u00e9s, plut\u00f4t que de se fier uniquement \u00e0 l&#039;inspection visuelle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ce que les acheteurs doivent v\u00e9rifier avant de s&#039;engager dans une production d&#039;outillage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avant de verrouiller la s\u00e9lection du ressort pour un outil de production, il convient de v\u00e9rifier\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9flexion install\u00e9e \u00e0 la course maximale, exprim\u00e9e en pourcentage de la longueur libre, et non pas seulement en millim\u00e8tres.<\/li>\n\n\n\n<li>l&#039;hypoth\u00e8se de classe de charge et si elle laisse une marge pour l&#039;usure et les l\u00e9gers d\u00e9fauts d&#039;alignement<\/li>\n\n\n\n<li>Cycle de service pr\u00e9vu\u00a0: nombre de cycles par poste, nombre de postes par jour<\/li>\n\n\n\n<li>temp\u00e9rature de fonctionnement \u00e0 proximit\u00e9 du ressort, notamment lors de l&#039;emboutissage \u00e0 chaud ou \u00e0 proximit\u00e9 de structures soud\u00e9es<\/li>\n\n\n\n<li>que le remplacement soit planifi\u00e9 en fonction du nombre de cycles ou seulement apr\u00e8s une d\u00e9faillance visible<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ces points ne n\u00e9cessitent g\u00e9n\u00e9ralement qu&#039;une br\u00e8ve conversation, mais ils d\u00e9terminent si le projet conna\u00eetra un d\u00e9veloppement stable et r\u00e9gulier ou s&#039;il passera des mois \u00e0 courir apr\u00e8s les probl\u00e8mes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les sch\u00e9mas courants qui raccourcissent la dur\u00e9e de vie du ressort de matrice<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Plusieurs sch\u00e9mas r\u00e9currents se d\u00e9gagent des projets d&#039;outillage\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>passage \u00e0 une classe de couleur plus lourde sans r\u00e9duire la d\u00e9viation<\/li>\n\n\n\n<li>utiliser un ressort plus court \u00e0 une d\u00e9flexion plus \u00e9lev\u00e9e pour gagner de la place<\/li>\n\n\n\n<li>installer des ressorts contre des si\u00e8ges rugueux ou irr\u00e9guliers qui chargent les spires d&#039;extr\u00e9mit\u00e9 de mani\u00e8re in\u00e9gale<\/li>\n\n\n\n<li>m\u00e9langer des ressorts de lots ou de marques diff\u00e9rents dans le m\u00eame outil<\/li>\n\n\n\n<li>ne pas suivre le nombre de cycles d\u00e9j\u00e0 effectu\u00e9s par les ressorts, notamment apr\u00e8s les transferts d&#039;outils<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Aucune de ces d\u00e9cisions n&#039;est dramatique. Ce sont des d\u00e9cisions de routine qui paraissent g\u00e9n\u00e9ralement anodines sur le sch\u00e9ma.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quand la personnalisation est plus honn\u00eate que l&#039;achat de produits standards plus lourds<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Si la conception contraint un ressort de matrice standard \u00e0 une d\u00e9viation excessive, opter pour une classe de couleur sup\u00e9rieure ne fait souvent que retarder le probl\u00e8me. Dans ce cas, une g\u00e9om\u00e9trie personnalis\u00e9e (rapport de c\u00e2blage diff\u00e9rent, courbe de charge diff\u00e9rente ou interface d&#039;installation diff\u00e9rente) peut r\u00e9soudre le probl\u00e8me de fond plut\u00f4t que de le masquer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les acheteurs qui entreprennent ce type de projet ont g\u00e9n\u00e9ralement int\u00e9r\u00eat \u00e0 commencer par le <a href=\"https:\/\/dinglidiespring.com\/fr\/custom-springs-precision-solutions-for-automotive-medical-industrial-applications-dingli-spring\/\">ressort personnalis\u00e9<\/a> Opter pour cette solution plut\u00f4t que de passer par plusieurs s\u00e9ries de pi\u00e8ces standard plus lourdes qui, malgr\u00e9 tout, ne tiennent pas leurs promesses en termes de dur\u00e9e de vie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Questions fr\u00e9quemment pos\u00e9es<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Le num\u00e9ro de cycle indiqu\u00e9 dans un catalogue de ressorts de matrice est-il fiable\u00a0?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ce document est une r\u00e9f\u00e9rence fiable, sous r\u00e9serve des hypoth\u00e8ses de d\u00e9formation et d&#039;\u00e9tat du catalogue. Il ne constitue pas une garantie de dur\u00e9e de vie pour votre outil sp\u00e9cifique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Puis-je prolonger la dur\u00e9e de vie en choisissant simplement une couleur plus fonc\u00e9e\u00a0?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Parfois. Mais si le probl\u00e8me sous-jacent est une d\u00e9formation excessive ou un d\u00e9faut d&#039;alignement, une pi\u00e8ce plus lourde peut se rompre plus tard, mais toujours plus t\u00f4t que pr\u00e9vu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment savoir si un ressort de matrice est d\u00e9fectueux avant qu&#039;il ne se casse ?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contr\u00f4lez r\u00e9guli\u00e8rement la longueur libre et la charge. Une d\u00e9rive, quelle qu&#039;elle soit, est g\u00e9n\u00e9ralement un indicateur plus fiable que l&#039;observation de dommages visibles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quand est-il judicieux de concevoir des ressorts de matrice sur mesure plut\u00f4t que des ressorts standard\u00a0?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsque les classes de couleurs standard ne permettent pas d&#039;obtenir une enveloppe de d\u00e9flexion raisonnable, ou lorsque l&#039;espace d&#039;installation et la courbe de charge ne correspondent \u00e0 aucun \u00e9l\u00e9ment du catalogue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Travailler avec Dingli<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Cixi Dili Spring Co., Ltd. assure la production de ressorts de matrice depuis 1995, proposant des articles standard et des solutions sur mesure adapt\u00e9es \u00e0 chaque projet. Si vous avez besoin d&#039;aide pour estimer la dur\u00e9e de vie en fatigue r\u00e9aliste avant de lancer la production d&#039;outillage, consultez la documentation suivante\u00a0: <a href=\"https:\/\/dinglidiespring.com\/fr\/products\/die-springs\/\">gamme de produits \u00e0 ressorts de matrice<\/a>, explorer <a href=\"https:\/\/dinglidiespring.com\/fr\/process\/aftertreatment\/\">options de post-traitement<\/a>, ou commencer par <a href=\"https:\/\/dinglidiespring.com\/fr\/custom-springs-precision-solutions-for-automotive-medical-industrial-applications-dingli-spring\/\">support de ressort personnalis\u00e9<\/a>. Pour toute discussion relative au projet, veuillez nous contacter. <a href=\"mailto:jackchen@dinglidiespring.com\">jackchen@dinglidiespring.com<\/a> ou WhatsApp <strong>+86 13586942004<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>La dur\u00e9e de vie en fatigue des ressorts de matrice ne se r\u00e9sume pas \u00e0 une simple valeur num\u00e9rique sur un catalogue. Ce guide explique comment interpr\u00e9ter les valeurs de cycles, les limites de d\u00e9flexion et les codes couleur standard avant de s&#039;engager dans un projet d&#039;outillage.<\/p>","protected":false},"author":2,"featured_media":8394,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,22],"tags":[168,167,169],"class_list":["post-8393","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-die-spring","category-technical-springs","tag-die-spring-cycle-estimate","tag-die-spring-service-life","tag-tooling-spring-durability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Estimating Die Spring Fatigue Life Before You Commit to a Tooling Run<\/title>\n<meta name=\"description\" content=\"Estimate die spring fatigue life before locking a tooling run. 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