{"id":6384,"date":"2021-10-28T15:29:19","date_gmt":"2021-10-28T13:29:19","guid":{"rendered":"https:\/\/www.3pcorporate.com\/\/ingenierie\/injection\/injection-haute-precision\/"},"modified":"2022-04-06T11:46:31","modified_gmt":"2022-04-06T09:46:31","slug":"injection-haute-precision","status":"publish","type":"page","link":"https:\/\/www.3pcorporate.com\/fr\/ingenierie\/injection\/injection-haute-precision\/","title":{"rendered":"Injection haute pr\u00e9cision"},"content":{"rendered":"

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Injection haute pr\u00e9cision pour les pi\u00e8ces critiques<\/h1><\/div>

L’injection haute pr\u00e9cision de plastiques haute performance ou de plastiques techniques est n\u00e9cessaire pour les composants critiques. De telles pi\u00e8ces, \u00e0 faibles tol\u00e9rances ou \u00e0 ultra faible \u00e9paisseur, peuvent \u00eatre r\u00e9alis\u00e9es par diff\u00e9rents moyens. Mais le moulage par injection haute pr\u00e9cision est la seule solution abordable lorsqu’il s’agit de volumes \u00e9lev\u00e9s ou de formes complexes.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

Qu'est-ce que le moulage par injection de haute pr\u00e9cision ?<\/h2><\/div>
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Le moulage par injection haute pr\u00e9cision concerne la production de pi\u00e8ces complexes en thermoplastiques. Il s’agit aussi bien de plastiques \u00e0 haute performance que de plastiques techniques.<\/p>\n

G\u00e9n\u00e9ralement, l\u2019injection haute pr\u00e9cision r\u00e9pond \u00e0 au moins 3 des 4 \u00e9l\u00e9ments suivants<\/p>\n

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  • Forte pr\u00e9cision dimensionnelle, avec des tol\u00e9rances tr\u00e8s faibles. Typiquement pour les thermoplastiques, l’intervalle de tol\u00e9rance associ\u00e9 aux exigences CPK sera inf\u00e9rieur \u00e0 100 \u00b5m pour les petites pi\u00e8ces (quelques centim\u00e8tres)<\/li>\n
  • Faible \u00e9paisseur de paroi, g\u00e9n\u00e9ralement inf\u00e9rieure \u00e0 500 \u00b5m pour les petites pi\u00e8ces. Il s’agit d’une indication g\u00e9n\u00e9rale, car certains thermoplastiques sont plus sensibles concern\u00e9s par les contraintes d\u2019\u00e9paisseur que d’autres<\/li>\n
  • Pi\u00e8ce complexe, g\u00e9n\u00e9ralement avec des contre-d\u00e9pouilles ou encore un besoin particulier, et des outils sp\u00e9cifiques, pour extraire la pi\u00e8ce du moule sans la d\u00e9former<\/li>\n
  • Volume \u00e9lev\u00e9. Ce crit\u00e8re est important car il aura un impact sur la capabilit\u00e9 du processus (CPK). Pour les petits volumes, d’autres solutions comme l’usinage peuvent \u00eatre plus adapt\u00e9es<\/li>\n<\/ul>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div>

    Face aux pi\u00e8ces m\u00e9talliques, le moulage de thermoplastiques par injection haute pr\u00e9cision augmente les performances globales<\/h2><\/div>
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    On consid\u00e8re souvent que les pi\u00e8ces m\u00e9talliques peuvent pr\u00e9senter moins de restrictions sur les crit\u00e8res de dimensions, et donc qu’elles peuvent \u00eatre plus abordables.<\/p>\n

    C’est vrai. Il est vrai aussi que beaucoup de pi\u00e8ces produites par injection haute pr\u00e9cision de thermoplastiques \u00e9taient d’abord des pi\u00e8ces m\u00e9talliques. Cela montre que m\u00eame s’il est techniquement difficile de substituer des plastiques hautes performances aux pi\u00e8ces m\u00e9talliques, il en ressort en fait des atouts importants. Typiquement, la substitution de pi\u00e8ces critiques en m\u00e9tal par des mat\u00e9riaux thermoplastiques permet des gains de poids, d’efficacit\u00e9 (pour les pi\u00e8ces en mouvement) ou de bruit et vibration (NVH : noise vibration and Harshness). Avec les composites et les plastiques hautes performances, on peut m\u00eame d\u00e9passer les propri\u00e9t\u00e9s m\u00e9caniques des pi\u00e8ces m\u00e9talliques.<\/div>\n
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    Un exemple typique de tels gains est la fabrication d\u2019engrenages. Les engrenages standard en thermoplastiques sont courants. Mais pour des engrenages de haute pr\u00e9cision, les engrenages m\u00e9talliques \u00e9taient la solution la plus courante. Cependant, avec le d\u00e9veloppement de l’injection haute pr\u00e9cision, les engrenages thermoplastiques de haute pr\u00e9cision permettent d\u2019obtenir une meilleure efficacit\u00e9, un couple plus faible et une nette r\u00e9duction du bruit que les engrenages m\u00e9talliques, sans r\u00e9duction de la dur\u00e9e de vie..<\/div>\n
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    Si malgr\u00e9 cela, il est n\u00e9cessaire de surveiller particuli\u00e8rement la dur\u00e9e de vie de l\u2019engrenage, sa r\u00e9sistance m\u00e9canique ou sa dilatation thermique, l’injection haute pr\u00e9cision est totalement compatible au surmoulage d’insert m\u00e9tallique. Cette solution combine les atouts des pi\u00e8ces m\u00e9talliques et thermoplastiques sur diff\u00e9rentes surfaces fonctionnelles, pour un gain global sur le produit final.<\/div>\n
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    Ainsi, la substitution du m\u00e9tal par des thermoplastiques pour les pi\u00e8ces critiques peut augmenter consid\u00e9rablement la valeur ajout\u00e9e du produit final et ainsi surmonter les d\u00e9fis de l’injection haute pr\u00e9cision.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div>

    La substitution du m\u00e9tal par l'injection thermoplastique de haute pr\u00e9cision n\u00e9cessite un fort co-d\u00e9veloppement<\/h2><\/div>
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    Les solutions m\u00e9talliques pour les pi\u00e8ces critiques ne peuvent pas \u00eatre substitu\u00e9es directement en solutions thermoplastiques. Les contraintes techniques ne sont pas les m\u00eames entre les deux proc\u00e9d\u00e9s. Un redesign complet est rarement n\u00e9cessaire, mais certaines surfaces fonctionnelles peuvent n\u00e9cessiter des modifications. C’est pourquoi une bonne compr\u00e9hension des parties critiques et de leurs parties fonctionnelles est n\u00e9cessaire.<\/p>\n

    Int\u00e9grer la connaissance des contraintes des thermoplastiques et le d\u00e9fi de l’injection haute pr\u00e9cision avec la conception des pi\u00e8ces critiques est la cl\u00e9 d’un d\u00e9veloppement r\u00e9ussi, et d’un produit r\u00e9ussi.<\/p>\n

    C’est pourquoi 3P co-d\u00e9veloppe la solution avec ses clients, en travaillant \u00e9troitement avec l’ensemble des acteurs de la conception et de la production.<\/p>\n

    Des relations fortes avec les moulistes et avec le bureau d’\u00e9tudes techniques permettent \u00e0 3P d’int\u00e9grer tout le savoir-faire des polym\u00e8res hautes performances et de leur comportement thermique. 3P travaille sur le concept d’origine pour optimiser la r\u00e9sistance m\u00e9canique et le respect des dimensions mais aussi le co\u00fbt.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":6276,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"100-width.php","meta":{"footnotes":""},"class_list":["post-6384","page","type-page","status-publish","hentry"],"yoast_head":"\nInjection haute pr\u00e9cision - 3P Corporate<\/title>\n<meta name=\"description\" content=\"L'injection haute pr\u00e9cision de plastiques haute performance ou de plastiques techniques est n\u00e9cessaire pour les composants critiques.\" \/>\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.3pcorporate.com\/fr\/ingenierie\/injection\/injection-haute-precision\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Injection haute pr\u00e9cision\" \/>\n<meta property=\"og:description\" content=\"L'injection haute pr\u00e9cision de plastiques haute performance ou de plastiques techniques est n\u00e9cessaire pour les composants critiques.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.3pcorporate.com\/fr\/ingenierie\/injection\/injection-haute-precision\/\" \/>\n<meta property=\"og:site_name\" content=\"3P Corporate\" \/>\n<meta property=\"article:modified_time\" content=\"2022-04-06T09:46:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.3pcorporate.com\/\/wp-content\/uploads\/2021\/10\/High_precision_electrovalve_seat_injeciton_molding-min.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.3pcorporate.com\\\/fr\\\/ingenierie\\\/injection\\\/injection-haute-precision\\\/\",\"url\":\"https:\\\/\\\/www.3pcorporate.com\\\/fr\\\/ingenierie\\\/injection\\\/injection-haute-precision\\\/\",\"name\":\"Injection haute pr\u00e9cision - 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