{"id":22087,"date":"2024-07-22T17:11:30","date_gmt":"2024-07-22T09:11:30","guid":{"rendered":"https:\/\/firstmold.com\/?post_type=case-study&#038;p=22087"},"modified":"2026-01-27T14:29:11","modified_gmt":"2026-01-27T06:29:11","slug":"production-of-automotive-armrest-bases","status":"publish","type":"case-study","link":"https:\/\/firstmold.com\/fr\/case-study\/production-of-automotive-armrest-bases\/","title":{"rendered":"Fabrication du bo\u00eetier de l'accoudoir de la console centrale de l'automobile par moulage par injection"},"content":{"rendered":"<p>L'accoudoir de la console centrale joue un r\u00f4le \u00e0 la fois esth\u00e9tique et fonctionnel. Le design et la finition des mat\u00e9riaux contribuent \u00e0 la beaut\u00e9 g\u00e9n\u00e9rale de l'habitacle. Toutefois, l'accoudoir joue avant tout un r\u00f4le fonctionnel en apportant du confort et en am\u00e9liorant la commodit\u00e9. Par exemple, il comporte g\u00e9n\u00e9ralement un espace de rangement secret pour les objets personnels tels que les t\u00e9l\u00e9phones, les portefeuilles et les cl\u00e9s.<\/p>\n\n\n\n<p>L'accoudoir de la console centrale offre un espace de repos pour les bras du conducteur et du passager avant. Cela r\u00e9duit le risque de raideur musculaire et de fatigue, en particulier pendant les longs trajets. Lorsque les bras sont bien repos\u00e9s, le conducteur peut maintenir une posture stable et d\u00e9tendue, ce qui est essentiel pour une meilleure ma\u00eetrise du v\u00e9hicule.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"683\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Injection-molded-car-armrest-base.webp\" alt=\"Base d&#039;accoudoir de voiture moul\u00e9e par injection\" class=\"wp-image-22098\" style=\"width:800px\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Injection-molded-car-armrest-base.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Injection-molded-car-armrest-base-300x205.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Injection-molded-car-armrest-base-768x525.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Injection-molded-car-armrest-base-18x12.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-components-of-the-center-console-armrest-in-modern-vehicles\">Composants de l'accoudoir de la console centrale dans les v\u00e9hicules modernes<\/h2>\n\n\n\n<p>Les constructeurs de la plupart des v\u00e9hicules modernes souhaitent que chaque caract\u00e9ristique augmente le confort ou apporte de nouvelles fonctionnalit\u00e9s. Les diff\u00e9rents composants int\u00e9gr\u00e9s dans la fabrication des pi\u00e8ces de l'accoudoir de la console centrale sont con\u00e7us pour r\u00e9pondre \u00e0 cette vision.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Composants de l'accoudoir de la console centrale<\/th><th>Fonction<\/th><\/tr><tr><td>Logement de l'accoudoir de la console centrale<\/td><td>Il s'agit d'une enveloppe ext\u00e9rieure rigide qui prot\u00e8ge les composants internes de l'accoudoir. C'est la partie qui est physiquement mont\u00e9e sur la console centrale ou le ch\u00e2ssis pour assurer la stabilit\u00e9 structurelle. Il abrite des \u00e9l\u00e9ments tels que les porte-gobelets et les composants \u00e9lectriques dans les v\u00e9hicules modernes.<\/td><\/tr><tr><td>Compartiment de rangement<\/td><td>L'accoudoir sert g\u00e9n\u00e9ralement de couvercle \u00e0 une bo\u00eete de rangement cach\u00e9e ou \u00e0 un bac de console. Le compartiment est utile pour garder des objets personnels \u00e0 l'abri des regards.<\/td><\/tr><tr><td>Rembourrage\/coussin<\/td><td>La partie sup\u00e9rieure de l'accoudoir est g\u00e9n\u00e9ralement rembourr\u00e9e ou recouverte d'un mat\u00e9riau souple pour am\u00e9liorer le confort.<\/td><\/tr><tr><td>M\u00e9canisme de charni\u00e8re<\/td><td>L'accoudoir de la console centrale peut s'ouvrir et se fermer en toute s\u00e9curit\u00e9 \u00e0 l'aide d'un m\u00e9canisme de charni\u00e8res. Dans certains cas, les charni\u00e8res permettent des r\u00e9glages verticaux ainsi que des r\u00e9glages vers l'avant et vers l'arri\u00e8re pour un confort personnalis\u00e9.<\/td><\/tr><tr><td>\u00c9lectronique int\u00e9gr\u00e9e<\/td><td>La partie moderne de l'accoudoir de la console centrale est devenue une plaque tournante pour divers appareils \u00e9lectroniques. Les ports de charge, les boutons de commande, l'\u00e9cran d'infodivertissement et le passage des c\u00e2bles sont int\u00e9gr\u00e9s dans l'accoudoir.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-client-requirements\">Exigences du client<\/h2>\n\n\n\n<p>Le client avait des exigences strictes en mati\u00e8re d'apparence et de fonctionnalit\u00e9. En termes d'apparence, le client voulait une pi\u00e8ce pour l'accoudoir de la console centrale qui soit exempte des d\u00e9fauts que l'on rencontre couramment sur les surfaces incurv\u00e9es, notamment les marques d'enfoncement, les lignes de soudure et les marques d'\u00e9coulement. En tant que constructeur automobile haut de gamme, le moindre d\u00e9faut de moulage par injection de l'accoudoir de la console centrale peut affecter l'attrait de l'habitacle.<\/p>\n\n\n\n<p>En termes de fonctionnalit\u00e9, il devait pr\u00e9senter une bonne stabilit\u00e9 structurelle et des dimensions \u00e0 encliqueter pour faciliter l'assemblage. Les autres caract\u00e9ristiques auxquelles le client tenait sont la perpendicularit\u00e9 des montants de montage, le jeu d'ajustement, la tol\u00e9rance de la pi\u00e8ce de \u00b10,1 mm et la tol\u00e9rance du moule de \u00b10,05 mm.<\/p>\n\n\n\n<p>L'accoudoir \u00e9tant cens\u00e9 r\u00e9sister \u00e0 la pression du bras et \u00e0 plusieurs cycles d'ouverture et de fermeture, le constructeur s'est \u00e9galement pr\u00e9occup\u00e9 de sa durabilit\u00e9. Si l'accoudoir tombe en panne trop t\u00f4t, cela peut donner une mauvaise image du constructeur automobile.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-challenges-and-solutions\">D\u00e9fis et solutions<\/h2>\n\n\n\n<p>Chacune des exigences d\u00e9finies par le fabricant s'accompagnait d'un d\u00e9fi unique. Le plan du fabricant comportait plusieurs sp\u00e9cifications en mati\u00e8re de mat\u00e9riaux et de dimensions qui \u00e9taient plus difficiles \u00e0 r\u00e9aliser avec une technique de moulage classique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-achieving-a-flawless-appearance-on-thin-center-console-armrest-housing\">Obtenir un aspect impeccable pour le bo\u00eetier mince de l'accoudoir de la console centrale<\/h3>\n\n\n\n<p>Le premier des d\u00e9fis que First Mold devait relever \u00e9tait la cr\u00e9ation d'une pi\u00e8ce stable \u00e0 paroi mince. L'all\u00e8gement est extr\u00eamement important pour l'efficacit\u00e9 \u00e9nerg\u00e9tique des automobiles. L'un des moyens d'y parvenir est d'apporter des modifications \u00e0 la conception afin de r\u00e9duire l'utilisation de mat\u00e9riaux.<\/p>\n\n\n\n<p>Les parois minces sont renforc\u00e9es par des nervures pour assurer leur stabilit\u00e9. Cependant, les nervures introduisent souvent des points faibles dans la structure si le mat\u00e9riau ou le processus est inad\u00e9quat. Cela peut entra\u00eener des probl\u00e8mes tels que la rupture de l'encliquetage ou le gauchissement de la coque (entra\u00eenant l'incapacit\u00e9 de l'accoudoir \u00e0 s'ouvrir\/se fermer ou \u00e0 se d\u00e9tacher). Chacun de ces probl\u00e8mes raccourcit le cycle de vie du produit, qui est g\u00e9n\u00e9ralement de \u22655 ans pour la plupart des composants automobiles.<\/p>\n\n\n\n<p>Outre l'obtention d'une apparence exempte des d\u00e9fauts de fabrication courants du bo\u00eetier de l'accoudoir de la console centrale, le constructeur automobile souhaitait \u00e9galement que l'accoudoir de la console centrale pr\u00e9sente une gravure de texture stylis\u00e9e. Pour ce faire, la gravure a d\u00fb \u00eatre grav\u00e9e dans le moule, ce qui a n\u00e9cessit\u00e9 un usinage CNC d\u00e9taill\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-durability-concerns-with-snap-fit-design\">Probl\u00e8mes de durabilit\u00e9 li\u00e9s \u00e0 la conception du syst\u00e8me d'encliquetage<\/h3>\n\n\n\n<p>Pour garantir la durabilit\u00e9 du moulage par injection du bo\u00eetier de l'accoudoir de la console centrale, First Mold a d\u00fb relever les d\u00e9fis pos\u00e9s par les modules \u00e0 encliquetage, qui doivent r\u00e9sister \u00e0 des milliers de cycles d'ouverture et de fermeture. Dans les conceptions \u00e0 encliquetage, il y a g\u00e9n\u00e9ralement une concentration de contraintes autour de la base, ce qui n\u00e9cessite l'ajout de cong\u00e9s ou de rayons. Les autres d\u00e9fis que First Mold a d\u00fb relever sont les suivants :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Rupture de fatigue :<\/em><\/strong> Cette d\u00e9faillance r\u00e9sulte de l'assemblage et du d\u00e9sassemblage r\u00e9p\u00e9t\u00e9s des boutons-pression. Une fa\u00e7on de l'\u00e9viter est d'utiliser les courbes Contrainte-Nombre de cycles, \u00e9galement connues sous le nom de courbes S-N, pour la s\u00e9lection des mat\u00e9riaux.<\/li>\n\n\n\n<li><strong><em>La peur au ventre :<\/em><\/strong> Avec le temps, le plastique se d\u00e9forme naturellement sous l'effet d'une charge soutenue, ce qui affaiblit l'encliquetage. Il est donc essentiel d'utiliser des mat\u00e9riaux r\u00e9sistants au fluage comme le polybutyl\u00e8ne t\u00e9r\u00e9phtalate, un plastique technique solide et semi-cristallin, ou d'autres plastiques renforc\u00e9s pour la production de boutons-pression. Pour ce projet de fabrication de bo\u00eetier d'accoudoir de console centrale, First Mold a opt\u00e9 pour un m\u00e9lange d'acrylonitrile butadi\u00e8ne styr\u00e8ne (ABS), qui pr\u00e9sente une solidit\u00e9, une rigidit\u00e9 et une r\u00e9sistance \u00e0 la chaleur \u00e9lev\u00e9es, et de polycarbonate (PC). Ce mat\u00e9riau hybride offre un \u00e9quilibre sup\u00e9rieur en termes de durabilit\u00e9, de robustesse et de performances thermiques.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-assembly-compatibility-challenges-of-center-console-armrest-parts\">Probl\u00e8mes de compatibilit\u00e9 d'assemblage des pi\u00e8ces de l'accoudoir de la console centrale<\/h3>\n\n\n\n<p>La facilit\u00e9 d'assemblage d'un mod\u00e8le \u00e0 encliquetage d\u00e9pend de la relation entre les pi\u00e8ces correspondantes. Les \u00e9l\u00e9ments de conception tels que les dimensions de l'encliquetage, le jeu d'ajustement, la perpendicularit\u00e9 des montants de montage et la tol\u00e9rance d\u00e9termineront le bon fonctionnement des pi\u00e8ces.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Dimensions de l'encliquetage :<\/em><\/strong> Les deux parties doivent avoir des dimensions pr\u00e9cises et \u00eatre fabriqu\u00e9es \u00e0 partir de mat\u00e9riaux souples. Cela permet aux deux moiti\u00e9s de se d\u00e9former temporairement pendant l'assemblage et de reprendre leur forme initiale pour cr\u00e9er une connexion \u00e9tanche. Les dimensions ad\u00e9quates garantissent une r\u00e9sistance suffisante.<\/li>\n\n\n\n<li><strong><em>Espace libre :<\/em><\/strong> Il s'agit de l'espace entre les deux pi\u00e8ces. L'ajustement par jeu comprend un espace important entre les deux pi\u00e8ces, ce qui facilite l'assemblage. En revanche, l'ajustement serr\u00e9 est utilis\u00e9 pour cr\u00e9er un joint plus solide et semi-permanent. Dans le cas d'un ajustement serr\u00e9, les pi\u00e8ces sont plus grandes que les trous dans lesquels elles s'ins\u00e8rent et leur assemblage n\u00e9cessite une certaine force.<\/li>\n\n\n\n<li><strong><em>Perpendicularit\u00e9 des poteaux de montage :<\/em><\/strong> Pour que les pi\u00e8ces s'embo\u00eetent correctement, les montants de montage doivent former un angle de 90 degr\u00e9s par rapport \u00e0 la surface de la base. Cela leur permet de reposer \u00e0 plat sur la surface et d'\u00e9viter d'introduire des contraintes ou des d\u00e9salignements.<\/li>\n\n\n\n<li><strong><em>Tol\u00e9rance :<\/em><\/strong> Il s'agit de la variation admissible des dimensions de la pi\u00e8ce. Aucun processus de fabrication n'est parfait. C'est pourquoi les pi\u00e8ces pr\u00e9sentent g\u00e9n\u00e9ralement de petites diff\u00e9rences (le plus souvent n\u00e9gligeables). La tol\u00e9rance fixe la limite des variations acceptables pour les pi\u00e8ces. Lorsque les pi\u00e8ces se situent dans les tol\u00e9rances accept\u00e9es, elles sont cens\u00e9es s'assembler et fonctionner correctement. Pour ce projet de fabrication de pi\u00e8ces pour l'accoudoir de la console centrale, le client avait fix\u00e9 la limite des pi\u00e8ces \u00e0 \u00b10,1 mm et celle du moule \u00e0 \u00b10,05 mm.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-clients-benefited-from-working-with-first-mold-s-solution\">Quels sont les avantages pour les clients de travailler avec la solution de First Mold ?<\/h2>\n\n\n\n<p>En raison de la conception complexe du bo\u00eetier de l'accoudoir de la console centrale, First Mold a utilis\u00e9 le logiciel de simulation Moldflow pour pr\u00e9voir \u00e0 l'avance le remplissage\/r\u00e9tr\u00e9cissement du produit. Moldflow simule la mani\u00e8re dont le polym\u00e8re fondu s'\u00e9coule dans la cavit\u00e9 du moule et la remplit. Cette simulation permet d'identifier les pi\u00e8ges \u00e0 air, les coups courts, le remplissage in\u00e9gal et les lignes de soudure.<\/p>\n\n\n\n<p>Le r\u00e9sultat a permis \u00e0 First Mold d'optimiser les structures des coulisseaux et des releveurs de l'outil de moulage par injection du bo\u00eetier de l'accoudoir de la console centrale. Par exemple, pour \u00e9viter le flashage du moule, qui entra\u00eene une augmentation du gaspillage de mat\u00e9riau et une finition secondaire plus fastidieuse, First Mold a veill\u00e9 \u00e0 ce que le jeu entre les curseurs et les releveurs soit \u22640,02 mm.<\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 la simulation virtuelle, First Mold a pu limiter les essais de moulage \u00e0 2 ou 3 fois. Les essais r\u00e9p\u00e9t\u00e9s prennent du temps et sont co\u00fbteux. Gr\u00e2ce \u00e0 une planification ad\u00e9quate et \u00e0 l'utilisation des derni\u00e8res technologies virtuelles, First Mold a \u00e9t\u00e9 en mesure d'offrir au client une meilleure valeur ajout\u00e9e, en termes de d\u00e9lai de mise sur le march\u00e9 du produit et d'argent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-implementing-a-20-production-capacity-buffer\">Mise en \u0153uvre d'un tampon de capacit\u00e9 de production 20%<\/h3>\n\n\n\n<p>Pour aider le client \u00e0 atteindre la capacit\u00e9 de moulage par injection de l'accoudoir de la console centrale, First Mold a d\u00e9ploy\u00e9 plusieurs machines de moulage par injection du m\u00eame mod\u00e8le. Une capacit\u00e9 de production minimale de 20% a \u00e9t\u00e9 r\u00e9serv\u00e9e comme tampon.<\/p>\n\n\n\n<p>En d'autres termes, si tous les moules destin\u00e9s \u00e0 la fabrication de pi\u00e8ces pour l'accoudoir de la console centrale fonctionnent \u00e0 une capacit\u00e9 de 80%, ils r\u00e9pondront \u00e0 la demande actuelle du client. Si tous les moules fonctionnent \u00e0 une capacit\u00e9 de 100%, le nombre de pi\u00e8ces cr\u00e9\u00e9es sera sup\u00e9rieur de 20% \u00e0 la demande. Cet exc\u00e9dent de 20% cr\u00e9e une r\u00e9serve pour les d\u00e9ficits pouvant r\u00e9sulter de la maintenance, de pics soudains de la demande et de perturbations inattendues.<\/p>\n\n\n\n<p>La capacit\u00e9 de production suppl\u00e9mentaire de 20% peut \u00e9galement s'av\u00e9rer utile pour tester de nouveaux mat\u00e9riaux sans affecter n\u00e9gativement les lignes de production.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-production-part-approval-process-documentation\">Documentation du processus d'approbation des pi\u00e8ces de production<\/h3>\n\n\n\n<p>First Mold fonctionne selon le syst\u00e8me de certification IATF 16949 et fournit une documentation PPAP. Cette documentation d\u00e9montre que les outils de moulage par injection de l'accoudoir de la console centrale que nous avons livr\u00e9s r\u00e9pondront syst\u00e9matiquement aux exigences techniques et de qualit\u00e9 des pi\u00e8ces de l'accoudoir de la console centrale du client.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"1000\" height=\"544\" src=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Product-design-of-automotive-armset-base.webp\" alt=\"Conception d&#039;une base d&#039;armature automobile\" class=\"wp-image-22099\" srcset=\"https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Product-design-of-automotive-armset-base.webp 1000w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Product-design-of-automotive-armset-base-300x163.webp 300w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Product-design-of-automotive-armset-base-768x418.webp 768w, https:\/\/firstmold.com\/wp-content\/uploads\/2024\/07\/Product-design-of-automotive-armset-base-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1767511170876\"><strong class=\"schema-faq-question\">Le premier moule peut-il inclure une gravure sur l'outil de fabrication des pi\u00e8ces de l'accoudoir de la console centrale ?<\/strong> <p class=\"schema-faq-answer\">First Mold peut inclure des textures dans la cavit\u00e9 du moule \u00e0 l'aide de techniques d'usinage CNC de haute pr\u00e9cision sans compromettre leur exactitude dimensionnelle. Le moule est soumis \u00e0 des tests d'assurance qualit\u00e9 et \u00e0 un traitement m\u00e9ticuleux pour s'assurer qu'il r\u00e9pond aux exigences fonctionnelles du client.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1767511190022\"><strong class=\"schema-faq-question\">Comment First Mold \u00e9vite-t-il les d\u00e9fauts courants dans les pi\u00e8ces minces du bo\u00eetier de l'accoudoir de la console centrale ?<\/strong> <p class=\"schema-faq-answer\">First Mold s'appuie sur des logiciels de simulation avanc\u00e9s, sur l'optimisation des param\u00e8tres du processus de moulage et sur la mise en \u0153uvre de solides mesures de contr\u00f4le de la qualit\u00e9 pour s'assurer que les moules produisent des pi\u00e8ces coh\u00e9rentes et de haute qualit\u00e9. <\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p> Cette \u00e9tude de cas pr\u00e9sente les besoins communs des clients, les d\u00e9fis et les solutions dans la production de bases d'accoudoirs automobiles.<\/p>","protected":false},"author":2,"featured_media":22088,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"case-study-category":[66],"case-study-tag":[75],"class_list":["post-22087","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","case-study-category-injection-molding-cases","case-study-tag-consumer-electronic"],"acf":{"photo_gallery":{"case_study_gallery":[[{"id":22090,"title":"The appearance surface of the armrest must have a certain degree of smoothness","caption":"The appearance surface of the armrest must have a certain degree of 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