{"id":593,"date":"2018-10-17T00:12:11","date_gmt":"2018-10-16T16:12:11","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=593"},"modified":"2018-10-17T00:12:11","modified_gmt":"2018-10-16T16:12:11","slug":"chapter-26-1shrinkage-and-warpage","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/fr\/2018\/10\/17\/chapitre-26-1-retrait-et-gauchissement\/","title":{"rendered":"Chapitre 26-1, Retrait et gauchissement"},"content":{"rendered":"<h2>Pourquoi se produisent-ils ?<\/h2>\n<p>Le r\u00e9tr\u00e9cissement est inh\u00e9rent au processus de moulage par injection. Le r\u00e9tr\u00e9cissement se produit parce que le<br \/>\nla densit\u00e9 du polym\u00e8re varie entre la temp\u00e9rature de transformation et la temp\u00e9rature ambiante<br \/>\n(voir Volume sp\u00e9cifique (diagramme pvT)). Lors du moulage par injection, la variation du retrait, tant au niveau global qu'\u00e0 travers la section transversale d'une pi\u00e8ce, cr\u00e9e des contraintes internes. Ces contraintes dites r\u00e9siduelles (voir Contraintes r\u00e9siduelles) agissent sur une pi\u00e8ce avec des effets similaires aux contraintes externes. Si les contraintes r\u00e9siduelles induites pendant le moulage sont \u00e9lev\u00e9es<br \/>\nsuffisamment pour d\u00e9passer l'int\u00e9grit\u00e9 structurelle de la pi\u00e8ce, celle-ci se d\u00e9formera lors de l'\u00e9jection.<br \/>\ndu moule ou se fissurer sous l'effet d'une charge de service externe.<\/p>\n<h2>R\u00e9tr\u00e9cissement<\/h2>\n<p>Le retrait des pi\u00e8ces plastiques moul\u00e9es peut atteindre 20 % du volume, mesur\u00e9 \u00e0 la temp\u00e9rature de traitement et \u00e0 la temp\u00e9rature ambiante. Les mat\u00e9riaux cristallins et semi-cristallins sont particuli\u00e8rement sujets au retrait thermique ; les mat\u00e9riaux amorphes tendent \u00e0 se r\u00e9tracter moins. Lorsque les mat\u00e9riaux cristallins sont refroidis en dessous de leur temp\u00e9rature de transition, les mol\u00e9cules s'organisent de mani\u00e8re plus ordonn\u00e9e, formant des cristallites. En revanche, la microstructure des mat\u00e9riaux amorphes ne change pas avec le changement de phase. Cette diff\u00e9rence fait que les mat\u00e9riaux cristallins et semi-cristallins pr\u00e9sentent une plus grande diff\u00e9rence de volume sp\u00e9cifique ( ) entre la phase fondue et la phase solide (cristalline). Ce ph\u00e9nom\u00e8ne est illustr\u00e9 dans la figure 1 ci-dessous. Nous aimerions souligner que la vitesse de refroidissement affecte \u00e9galement le comportement du pvT \u00e0 refroidissement rapide des mat\u00e9riaux cristallins et semi-cristallins.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1336\" title=\"R\u00e9tr\u00e9cissement et gauchissement\" src=\"https:\/\/web.archive.org\/web\/20130131102912im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Shrinkage-and-warpage.gif\" alt=\"R\u00e9tr\u00e9cissement et gauchissement\" width=\"632\" height=\"404\" \/><\/p>\n<p><strong>FIGURE 1.<\/strong>\u00a0Les courbes pvT pour les polym\u00e8res amorphes et cristallins et la variation du volume sp\u00e9cifique entre l'\u00e9tat de transformation (point A) et l'\u00e9tat \u00e0 temp\u00e9rature ambiante et pression atmosph\u00e9rique (point B). Notez que le volume sp\u00e9cifique diminue lorsque la pression augmente.<\/p>\n<h3>Causes du retrait excessif des pi\u00e8ces<\/h3>\n<p>Un retrait excessif, au-del\u00e0 du niveau acceptable, peut \u00eatre caus\u00e9 par les facteurs suivants. La relation entre le retrait et plusieurs param\u00e8tres de traitement et l'\u00e9paisseur de la pi\u00e8ce est sch\u00e9matis\u00e9e dans la figure 2.<\/p>\n<p>- faible pression d'injection<br \/>\n- un temps d'attente ou de refroidissement court<br \/>\n- temp\u00e9rature de fusion \u00e9lev\u00e9e<br \/>\n- temp\u00e9rature \u00e9lev\u00e9e du moule<br \/>\n- faible pression de maintien.<\/p>\n<h3>Probl\u00e8mes caus\u00e9s par le r\u00e9tr\u00e9cissement des pi\u00e8ces<\/h3>\n<p>Une contraction volum\u00e9trique non compens\u00e9e entra\u00eene des marques d'enfoncement ou des vides \u00e0 l'int\u00e9rieur du moule. Le contr\u00f4le du retrait des pi\u00e8ces est important dans la conception des pi\u00e8ces, des moules et des processus, en particulier dans les applications exigeant des tol\u00e9rances serr\u00e9es. Le retrait qui entra\u00eene des marques d'enfoncement ou des vides peut \u00eatre r\u00e9duit ou \u00e9limin\u00e9 en tassant la cavit\u00e9 apr\u00e8s le remplissage. La conception du moule doit \u00e9galement prendre en compte le retrait afin de se conformer aux dimensions de la pi\u00e8ce. Le retrait de la pi\u00e8ce pr\u00e9dit par C-MOLD offre une ligne directrice utile pour la conception d'un moule ad\u00e9quat.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pourquoi se produisent-ils ? Le r\u00e9tr\u00e9cissement est inh\u00e9rent au processus de moulage par injection. Elle se produit parce que la densit\u00e9 du polym\u00e8re varie entre la temp\u00e9rature de transformation et la temp\u00e9rature ambiante (voir le volume sp\u00e9cifique (diagramme pvT)). Pendant le moulage par injection, la variation du retrait \u00e0 la fois globalement et \u00e0 travers la section transversale d'une pi\u00e8ce cr\u00e9e des contraintes internes. Ces contraintes dites [...]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-593","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 26-1,Shrinkage and warpage - Plastic Mold | China Mold Maker<\/title>\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.plasticmoldco.com\/fr\/2018\/10\/17\/\u0627\u0644\u0641\u0635\u0644-26-1\u0627\u0644\u0627\u0646\u0643\u0645\u0627\u0634-\u0648\u0627\u0644\u0627\u0644\u062a\u0648\u0627\u0621\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 26-1,Shrinkage and warpage - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"Why do they occur? 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Shrinkage is inherent in the injection molding process. Shrinkage occurs because the density of polymer varies from the processing temperature to the ambient temperature (see Specific volume (pvT diagram)). During injection molding, the variation in shrinkage both globally and through the cross section of a part creates internal stresses. 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