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PULLBULL-Problemas frecuentes en moldes de fundición a presión 1. Porosidad: Es la defecto más común. Se forma por burbujas de aire atrapadas o gas en la aleación fundida, crea huecos internos y debilita la resistencia mecánica de la pieza. 2. Rebabas excesivas: Ocurre por desgaste de la junta del molde, ajuste deficiente o alta presión de inyección. Deja bordes sobrantes que requieren limpieza extra. 3. Desgaste y fisuras del molde: El ciclo constante de altas temperaturas y enfri
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No Brasil, quase ninguém quer cortar gastos públicos. Não porque não saibam que é necessário, mas porque é impopular. A lógica política é simples: medidas de curto prazo que agradam ao eleitor garantem voto. Ajustes duros, que trazem resultados só no longo prazo, custam reputação. Por isso o ciclo se repete: Governos aumentam despesas para ganhar apoio. A dívida cresce. O ajuste é empurrado para o próximo mandato. O problema é que essa conta sempre chega. Só que não chega para os políticos —
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