{"id":600,"date":"2018-10-17T00:14:39","date_gmt":"2018-10-16T16:14:39","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=600"},"modified":"2018-10-17T00:14:39","modified_gmt":"2018-10-16T16:14:39","slug":"chapter-25-2-residual-stress-china-injection-mold","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/pt\/2018\/10\/17\/capitulo-25-2-tensao-residual-molde-de-injecao-de-porcelana\/","title":{"rendered":"Cap\u00edtulo 25-2, Tens\u00e3o residual, molde de inje\u00e7\u00e3o de porcelana"},"content":{"rendered":"<h1>Resfriamento desequilibrado<\/h1>\n<p>da parede do molde para o seu centro pode causar tens\u00e3o residual induzida termicamente. Al\u00e9m disso, a tens\u00e3o residual induzida termicamente assim\u00e9trica pode ocorrer se a taxa de resfriamento das duas superf\u00edcies for desequilibrada. Esse resfriamento desequilibrado resultar\u00e1 em um padr\u00e3o assim\u00e9trico de tens\u00e3o-compress\u00e3o na pe\u00e7a, causando um momento de flex\u00e3o que tende a causar empenamento da pe\u00e7a. Isso \u00e9 ilustrado na Figura 3 abaixo. Consequentemente, as pe\u00e7as com espessura n\u00e3o uniforme ou com \u00e1reas mal resfriadas s\u00e3o propensas a um resfriamento desequilibrado e, portanto, a tens\u00f5es t\u00e9rmicas residuais. Para pe\u00e7as moderadamente complexas, a distribui\u00e7\u00e3o da tens\u00e3o residual induzida pelo calor \u00e9 ainda mais complicada devido \u00e0 espessura n\u00e3o uniforme da parede, ao resfriamento do molde e \u00e0s restri\u00e7\u00f5es do molde \u00e0 contra\u00e7\u00e3o livre.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1328\" title=\"Resfriamento n\u00e3o balanceado\" src=\"https:\/\/web.archive.org\/web\/20130131102852im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Unbalanced-cooling.gif\" alt=\"\" width=\"584\" height=\"287\" \/><\/p>\n<h3>FIGURA 3. A tens\u00e3o residual assim\u00e9trica induzida termicamente causada pelo resfriamento desequilibrado ao longo da espessura da pe\u00e7a moldada provoca o empenamento da pe\u00e7a<\/h3>\n<h2>Densidades vari\u00e1veis de congelamento<\/h2>\n<p>A figura abaixo ilustra a varia\u00e7\u00e3o nas densidades congeladas causada pelo hist\u00f3rico de press\u00e3o de empacotamento.<\/p>\n<h3>Perfil de temperatura<\/h3>\n<p>A figura \u00e0 esquerda mostra o perfil de temperatura em um local da pe\u00e7a. Para fins de ilustra\u00e7\u00e3o, a pe\u00e7a \u00e9 dividida em oito camadas iguais ao longo da espessura da pe\u00e7a. O perfil mostra a temperatura no instante de tempo de solidifica\u00e7\u00e3o (congelamento) para cada camada (t1 a t8). Observe que o material come\u00e7a a se solidificar a partir das camadas externas e a interface congelada se move para dentro com o tempo.<\/p>\n<h3>Rastreamento de press\u00e3o<\/h3>\n<p>A figura central tra\u00e7a um hist\u00f3rico t\u00edpico de press\u00e3o, mostrando os n\u00edveis de press\u00e3o (P1 a P8) \u00e0 medida que cada camada se solidifica. Em geral, a press\u00e3o aumenta gradualmente durante o enchimento, atingindo um m\u00e1ximo no est\u00e1gio inicial de empacotamento e, em seguida, come\u00e7a a diminuir devido ao resfriamento e ao congelamento do port\u00e3o. Dessa forma, o material nas camadas externas e centrais se solidifica quando o n\u00edvel de press\u00e3o \u00e9 baixo, enquanto as camadas intermedi\u00e1rias congelam sob alta press\u00e3o de empacotamento.<\/p>\n<h3>Volume espec\u00edfico congelado<\/h3>\n<p>A figura \u00e0 direita mostra o tra\u00e7o do volume espec\u00edfico para a camada 5 em um gr\u00e1fico pvT e os volumes espec\u00edficos finais congelados para todas as camadas, marcados pelos c\u00edrculos s\u00f3lidos numerados.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1329\" title=\"Congelado em volume espec\u00edfico\" src=\"https:\/\/web.archive.org\/web\/20130131102852im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-specific-volume.gif\" alt=\"\" width=\"680\" height=\"251\" \/><\/p>\n<h3>FIGURA 4. Fatores que influenciam o desenvolvimento do volume espec\u00edfico \"congelado\"<br \/>\nEncolhimento diferencial<\/h3>\n<p>Considerando os volumes espec\u00edficos congelados, as v\u00e1rias camadas encolher\u00e3o de forma diferente, de acordo com as curvas pvT que regem o comportamento de encolhimento do material. Hipoteticamente, se cada camada fosse separada das outras (como mostrado na Figura 5), os elementos do material na figura \u00e0 esquerda abaixo teriam encolhido como os da figura central. Nesse caso, as camadas intermedi\u00e1rias tendem a encolher menos do que as outras devido ao menor volume espec\u00edfico congelado (ou, de forma equivalente, \u00e0 maior densidade congelada). Na realidade, todas as camadas est\u00e3o unidas. Portanto, o resultado final ser\u00e1 uma distribui\u00e7\u00e3o de encolhimento comprometida, com as camadas intermedi\u00e1rias sendo comprimidas e as camadas externas e centrais sendo esticadas.<\/p>","protected":false},"excerpt":{"rendered":"<p>O resfriamento desequilibrado da parede do molde para o seu centro pode causar tens\u00e3o residual induzida termicamente. Al\u00e9m disso, a tens\u00e3o residual induzida termicamente assim\u00e9trica pode ocorrer se a taxa de resfriamento das duas superf\u00edcies for desequilibrada. Esse resfriamento desequilibrado resultar\u00e1 em um padr\u00e3o assim\u00e9trico de tens\u00e3o-compress\u00e3o na pe\u00e7a, causando um momento de flex\u00e3o que tende a causar empenamento da pe\u00e7a. Isso [...]<\/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-600","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chapter 25-2, Residual stress, china injection mold - 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\/pt\/2018\/10\/17\/25-2-fejezet-marado-feszultseg-porcelan-froccsontoforma\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-2, Residual stress, china injection mold - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"Unbalanced cooling from the mold wall to its center can cause thermal-induced residual stress. 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Furthermore, asymmetrical thermal-induced residual stress can occur if the cooling rate of the two surfaces is unbalanced. Such unbalanced cooling will result in an asymmetric tension-compression pattern across the part, causing a bending moment that tends to cause part warpage. 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