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Home » Lubrificante de Matriz - 14 Grafite, o Insubstituível

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Lubrificante de Matriz - 14 Grafite, o Insubstituível

October 1, 2018
Henri Strasser
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Uma vez mostrado que um grafite bem selecionado e bem aplicado possibilita os melhores resultados em termos de vida de matriz, preenchimento da gra­vura, redução de força de forjamento, qualidade do forjado e redução de sucata ficam, no entanto, aspectos negativos que são derivados da cor escura e da condutividade do grafite.

Também o fato de o lubrificante ser formulado para máxima aderência trazendo enormes vantagens na superfície da matriz pode ser um problema. Em todos os lugares com os quais ele entra em contato, ele se deposita. Na gravura da matriz, em contato com o billet, o grafite se queima formando CO2 e água. Isso é, desaparece e precisa ser reposto para o próximo forjamento. Nas vizinhanças da gravura, porta-matriz, prensa, no entanto, ele adere e deposita camada sobre camada e quando seca forma uma crosta dificílima de ser removida, o chamado build-up. Este depósito re­sidual é extremamente duro e nocivo em peças móveis e mecanis­mos onde ele se introduz, emperrando tudo. Apenas uma aplicação precisa por pulverização é capaz de reduzir este fenômeno.

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