{"id":19415,"date":"2024-05-08T17:43:12","date_gmt":"2024-05-08T09:43:12","guid":{"rendered":"https:\/\/firstmold.com\/?p=19415"},"modified":"2026-01-21T14:04:10","modified_gmt":"2026-01-21T06:04:10","slug":"burn-marks","status":"publish","type":"post","link":"https:\/\/firstmold.com\/fr\/tips\/burn-marks\/","title":{"rendered":"Marques de br\u00fblure dans le moulage par injection de mati\u00e8res plastiques"},"content":{"rendered":"

Les br\u00fblures ne sont pas fr\u00e9quentes. d\u00e9faut dans le moulage par injection<\/strong><\/a>. Par cons\u00e9quent, de nombreux praticiens de l'industrie du moule et du moulage par injection ne sont pas tr\u00e8s familiers avec ce ph\u00e9nom\u00e8ne. Bien que les marques de br\u00fblure ne soient pas li\u00e9es \u00e0 la structure du produit, FirstMold demande aux concepteurs de produits, aux concepteurs de structures et aux concepteurs m\u00e9caniques d'acqu\u00e9rir une certaine compr\u00e9hension de ce ph\u00e9nom\u00e8ne.<\/p>\n\n\n\n

Si vous \u00eates int\u00e9ress\u00e9 par d'autres d\u00e9fauts de moulage par injection, n'h\u00e9sitez pas \u00e0 cliquer sur les liens du tableau ci-dessous pour en savoir plus.<\/p>\n\n\n\n

Comprendre les diff\u00e9rents d\u00e9fauts du moulage par injection<\/th><\/tr>
Flash<\/strong><\/a><\/td>Coup court<\/strong><\/a><\/td>Marque d'\u00e9vier<\/strong><\/a><\/td>Distorsion\/D\u00e9formation<\/strong><\/a><\/td>Marque de br\u00fblure<\/strong><\/td><\/tr>
Marque d'\u00e9vasement \/ Trait d'argent<\/strong><\/a><\/td>Tache fonc\u00e9e\/Moucheture noire<\/strong><\/a><\/td>Marque de d\u00e9bit<\/strong><\/a><\/td>Bulle<\/strong><\/a><\/td>Ligne de soudure<\/strong><\/a><\/td><\/tr>
Diff\u00e9rence de couleur\/couleur in\u00e9gale<\/strong><\/a><\/td>Marque de la goupille d'\u00e9jection<\/a><\/strong><\/td><\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Qu'est-ce qu'une br\u00fblure dans le moulage par injection ?<\/h2>\n\n\n\n

Les marques de br\u00fblure sont des marques sombres ou noires qui se forment \u00e0 l'extr\u00e9mit\u00e9 de la trajectoire d'\u00e9coulement ou dans les zones de gaz pi\u00e9g\u00e9s pendant le processus de moulage par injection en raison d'une mauvaise ventilation du moule ou d'une injection trop rapide, lorsque l'air \u00e0 l'int\u00e9rieur du moule n'a pas le temps de s'\u00e9chapper et se r\u00e9chauffe soudainement sous haute pression (dans les cas extr\u00eames, les temp\u00e9ratures peuvent atteindre jusqu'\u00e0 3 000 degr\u00e9s). L'air comprim\u00e9 surchauff\u00e9 br\u00fble la mati\u00e8re fondue.<\/p>\n\n\n\n

\"Marques
Marques de br\u00fblure sur la nervure de la pi\u00e8ce en plastique moul\u00e9e<\/figcaption><\/figure>\n\n\n\n

Les traces de br\u00fblures affectent-elles le produit ?<\/h3>\n\n\n\n

Les marques de br\u00fblure sur les pi\u00e8ces moul\u00e9es par injection peuvent affecter l'apparence et la qualit\u00e9 du produit. Les zones affect\u00e9es peuvent pr\u00e9senter des couleurs et des textures diff\u00e9rentes, comme devenir noires, jaunes ou rugueuses, ce qui peut r\u00e9duire l'attrait esth\u00e9tique du produit ; comme le montre l'image ci-dessous, l'apparence est consid\u00e9rablement affect\u00e9e apr\u00e8s l'apparition de marques de br\u00fblure ;<\/p>\n\n\n\n

Les marques de br\u00fblure sur les pi\u00e8ces moul\u00e9es par injection peuvent \u00e9galement affecter les performances et la fiabilit\u00e9 du produit. Les zones affect\u00e9es peuvent modifier les propri\u00e9t\u00e9s physiques et chimiques des pi\u00e8ces moul\u00e9es par injection, en r\u00e9duisant par exemple leur solidit\u00e9, leur r\u00e9sistance \u00e0 la chaleur ou leur r\u00e9sistance \u00e0 la corrosion, ce qui peut nuire \u00e0 l'utilisabilit\u00e9 du produit ;<\/p>\n\n\n\n

Les marques de br\u00fblure sur les pi\u00e8ces moul\u00e9es par injection peuvent \u00e9galement affecter l'efficacit\u00e9 de la production et le contr\u00f4le des co\u00fbts ; les probl\u00e8mes de marques de br\u00fblure peuvent conduire \u00e0 la mise au rebut ou au retraitement des pi\u00e8ces moul\u00e9es par injection, ce qui augmente les co\u00fbts de production.<\/p>\n\n\n\n

Causes des br\u00fblures <\/h2>\n\n\n\n

4. Impact des mati\u00e8res premi\u00e8res <\/h3>\n\n\n\n

a) Teneur \u00e9lev\u00e9e en humidit\u00e9 et en substances volatiles dans les mati\u00e8res premi\u00e8res.<\/p>\n\n\n\n

b) Indice de fusion \u00e9lev\u00e9, bonne fluidit\u00e9 de la mati\u00e8re fondue, ce qui rend difficile l'expulsion des gaz.<\/p>\n\n\n\n

c) Additifs plastiques, colorants contenant des substances volatiles et de l'humidit\u00e9, ne r\u00e9sistant pas aux temp\u00e9ratures \u00e9lev\u00e9es entra\u00eenant une d\u00e9composition.<\/p>\n\n\n\n

Mesures d'am\u00e9lioration pour les br\u00fblures<\/h2>\n\n\n\n

1. Des marques de br\u00fblure apparaissent lors d'injections vides <\/h3>\n\n\n\n

a) V\u00e9rifier si la buse est bouch\u00e9e. <\/p>\n\n\n\n

b) V\u00e9rifier si la vis, la bague de contr\u00f4le, le barillet, etc. sont endommag\u00e9s. <\/p>\n\n\n\n

c) V\u00e9rifier le syst\u00e8me de chauffage, les lignes de capteurs de temp\u00e9rature, les thermocouples, les anneaux de chauffage et les r\u00e9glages de la temp\u00e9rature de plastification pour d\u00e9tecter toute anomalie. <\/p>\n\n\n\n

d) V\u00e9rifier si la poudre de couleur de la mati\u00e8re premi\u00e8re, le m\u00e9lange-ma\u00eetre, etc., contiennent des substances facilement d\u00e9composables et envisager de remplacer les mat\u00e9riaux par d'autres afin d'\u00e9liminer le probl\u00e8me. <\/p>\n\n\n\n

e) V\u00e9rifier si la contre-pression est trop \u00e9lev\u00e9e, si la vitesse de rotation du stockage est trop \u00e9lev\u00e9e ou si le temps de pr\u00e9plastification est trop long, ce qui entra\u00eene la d\u00e9composition et la carbonisation de la mati\u00e8re premi\u00e8re. <\/p>\n\n\n\n

2. Marques de br\u00fblure dans le moule <\/h3>\n\n\n\n

a) Pour moules \u00e0 canaux chauds<\/strong><\/a>, V\u00e9rifier que le canal chaud lui-m\u00eame et le contr\u00f4le de la temp\u00e9rature ne pr\u00e9sentent pas d'anomalies.<\/p>\n\n\n\n

b) Pour les moules \u00e0 canaux froids, v\u00e9rifier que les canaux et les portes ne sont pas endommag\u00e9s, etc. <\/p>\n\n\n\n

3. Marques de br\u00fblure sur le produit <\/h3>\n\n\n\n

a) Si des marques de br\u00fblure apparaissent sur les bords du produit, il faut envisager d'augmenter la ventilation et de r\u00e9duire la vitesse d'injection. <\/p>\n\n\n\n

b) Si des marques de br\u00fblure apparaissent au milieu du produit, il faut envisager de changer l'insert d'\u00e9chappement ou d'ajouter une broche d'\u00e9jection d'\u00e9chappement, et utiliser l'injection segment\u00e9e dans le processus, en r\u00e9duisant la vitesse d'injection \u00e0 l'endroit de la marque de br\u00fblure.<\/p>\n\n\n\n

c) Si des traces de br\u00fblure apparaissent \u00e0 l'extr\u00e9mit\u00e9 du produit, nous recommandons de nettoyer les rainures d'a\u00e9ration du moule et de r\u00e9duire la force de serrage.<\/p>\n\n\n\n

Analyse de cas sur les marques de br\u00fblures<\/h2>\n\n\n\n
\"Image
Image de cas de marques de br\u00fblures sur le produit<\/figcaption><\/figure>\n\n\n\n

Pr\u00e9sentation du produit<\/h3>\n\n\n\n

L'image ci-dessus montre un cas de marques de br\u00fblure sur un produit. L'image de droite est un gros plan de l'image de gauche.<\/p>\n\n\n\n

Le mat\u00e9riau utilis\u00e9 est le PBT, un type de connecteur aux parois \u00e9paisses et \u00e0 la surface d'apparence secondaire. En raison des exigences de haute qualit\u00e9 du client, les d\u00e9fauts de surface visibles sur le produit ne sont pas acceptables.<\/p>\n\n\n\n

Les conditions de moulage sont les suivantes.<\/p>\n\n\n\n

a. Temp\u00e9rature de moulage : 60\uff5e80\u2103.<\/p>\n\n\n\n

b. Temp\u00e9rature du mat\u00e9riau : 240\uff5e260\u2103.<\/p>\n\n\n\n

c. Vitesse d'injection en trois phases : premi\u00e8re phase \u00e0 180 mm\/s, deuxi\u00e8me phase \u00e0 135 mm\/s, troisi\u00e8me phase \u00e0 40 mm\/s.<\/p>\n\n\n\n

d. Temps d'injection : 1,5\uff5e3s.<\/p>\n\n\n\n

e. Pression d'injection : 1300\uff5e1500kgf\/cm\u00b2.<\/p>\n\n\n\n

Questions relatives aux produits<\/h3>\n\n\n\n

L'image du produit montre de l\u00e9g\u00e8res br\u00fblures \u00e0 l'int\u00e9rieur du cercle rouge, ce que le client n'accepte pas.<\/p>\n\n\n\n

Raisons et strat\u00e9gies<\/h3>\n\n\n\n

(1) Analyse des causes<\/strong><\/p>\n\n\n\n

Au cours de la premi\u00e8re essai de moisissure<\/strong><\/a>Apr\u00e8s l'analyse du mod\u00e8le d'\u00e9coulement, une analyse du mod\u00e8le d'\u00e9coulement a \u00e9t\u00e9 effectu\u00e9e, r\u00e9v\u00e9lant que l'emplacement des marques de br\u00fblure \u00e0 la ligne de fusion finale du produit \u00e9tait principalement d\u00fb au fait que les gaz ne pouvaient pas s'\u00e9chapper de la position marqu\u00e9e dans la cavit\u00e9 du moule, ce qui provoquait des marques de br\u00fblure dues au gaz pi\u00e9g\u00e9.<\/p>\n\n\n\n

(2) Strat\u00e9gies de solutions<\/strong><\/p>\n\n\n\n

\u00c9tant donn\u00e9 que le produit et les structures du moule ont d\u00e9j\u00e0 \u00e9t\u00e9 confirm\u00e9s par le client et ne peuvent \u00eatre modifi\u00e9s, le probl\u00e8me ne peut \u00eatre r\u00e9solu qu'en ajustant les processus de ventilation du moule et de moulage par injection.<\/p>\n\n\n\n

\u00c9largir autant que possible les fentes d'a\u00e9ration dans la trajectoire du moule, la surface de s\u00e9paration du moule et les broches d'\u00e9jection, en r\u00e9duisant la quantit\u00e9 d'a\u00e9ration finale afin d'att\u00e9nuer la gravit\u00e9 des marques de br\u00fblure.<\/p>\n\n\n\n

Adapter le processus de moulage par injection \u00e0 l'injection en plusieurs \u00e9tapes. En raison de l'\u00e9paisseur du produit, utiliser une vitesse faible, voire inf\u00e9rieure, au cours des deux derni\u00e8res \u00e9tapes de l'injection afin de r\u00e9duire la gravit\u00e9 des br\u00fblures.<\/p>\n\n\n\n

Derni\u00e8res paroles<\/h2>\n\n\n\n

Je suis Lee Young de FirstMold et je travaille avec diligence tous les jours. Sur la base de livres, de manuels et d'exp\u00e9riences pratiques en atelier, j'ai r\u00e9sum\u00e9 de nombreux ensembles d'exp\u00e9riences de travail pour faciliter la r\u00e9f\u00e9rence et l'apprentissage. Pour ceux qui s'int\u00e9ressent au moulage par injection, aux moules, \u00e0 la conception structurelle des produits et \u00e0 la conception des moules, il est important de lire, de pratiquer et d'essayer davantage, et de ne pas avoir peur de l'\u00e9chec. J'esp\u00e8re que mon exp\u00e9rience pourra vous aider.<\/p>","protected":false},"excerpt":{"rendered":"

Comprendre les marques de br\u00fblure dans le moulage par injection, identifier leurs causes, trouver des solutions et les ma\u00eetriser \u00e0 travers une \u00e9tude de cas simple.<\/p>","protected":false},"author":5,"featured_media":19419,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[48],"tags":[51,63],"class_list":["post-19415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-injection-molding","tag-injection-molding-defects"],"acf":[],"yoast_head":"\nBurn Marks In Injection Molding<\/title>\n<meta name=\"description\" content=\"Understand burn marks in injection molding, identify their causes, find solutions, and master them through a simple case study.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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