{"id":8803,"date":"2026-08-05T06:26:20","date_gmt":"2026-08-05T06:26:20","guid":{"rendered":"https:\/\/keertek.com\/?p=8803"},"modified":"2026-08-05T06:26:21","modified_gmt":"2026-08-05T06:26:21","slug":"removal-of-heavy-oil-deposits-and-grinding-sludge-from-hydraulic-cylinder-flanges","status":"publish","type":"post","link":"https:\/\/keertek.com\/pt\/removal-of-heavy-oil-deposits-and-grinding-sludge-from-hydraulic-cylinder-flanges\/","title":{"rendered":"Remo\u00e7\u00e3o de dep\u00f3sitos de \u00f3leo pesado e lodo de retifica\u00e7\u00e3o das flanges dos cilindros hidr\u00e1ulicos"},"content":{"rendered":"<p><strong>Um grande flange de cilindro hidr\u00e1ulico proveniente de uma escavadeira de minera\u00e7\u00e3o a c\u00e9u aberto representou um dos maiores desafios de limpeza j\u00e1 enfrentados pelo laborat\u00f3rio da Keertek: graxa espessa e compactada, misturada a poeira mineral e part\u00edculas de desgaste met\u00e1lico.<\/strong><\/p>\n\n\n\n<p>Os furos rosqueados e as ranhuras de veda\u00e7\u00e3o do flange foram preenchidos com um composto endurecido de graxa e areia que resistiu \u00e0 imers\u00e3o em solventes convencionais. A Keertek testou um <strong>sistema ultrass\u00f4nico de dupla frequ\u00eancia<\/strong>&nbsp;com um desengraxante industrial de alta alcalinidade aquecido a 80 \u00b0C. A banda de baixa frequ\u00eancia (28 kHz) gerou cavita\u00e7\u00e3o agressiva para a remo\u00e7\u00e3o de contaminantes em grande quantidade, enquanto a banda de alta frequ\u00eancia (68 kHz) penetrou nas roscas e nos furos cegos para uma limpeza de precis\u00e3o.<\/p>\n\n\n\n<p>Ap\u00f3s 25 minutos, toda a graxa e as part\u00edculas foram eliminadas. As roscas estavam limpas e intactas, e as superf\u00edcies de veda\u00e7\u00e3o n\u00e3o apresentavam corros\u00e3o. A empresa de minera\u00e7\u00e3o \u2014 que opera uma frota de mais de 40 escavadeiras \u2014 solicitou uma proposta detalhada para a instala\u00e7\u00e3o de uma \u00e1rea de limpeza no local.<\/p>\n\n\n\n<p><strong>Processo:<\/strong>&nbsp;Ultrassom de dupla frequ\u00eancia, 80 \u00b0C | <strong>Substrato:<\/strong>&nbsp;A\u00e7o-liga | <strong>Contaminante:<\/strong>&nbsp;Graxa pesada, poeira mineral, part\u00edculas met\u00e1licas<\/p>","protected":false},"excerpt":{"rendered":"<p>A large hydraulic cylinder flange from an open-pit mining excavator presented one of the toughest cleaning challenges Keertek&#8217;s lab has faced: thick, compacted grease mixed with mineral dust and metal wear particles. The flange&#8217;s threaded bores and seal grooves were packed with a hardened grease-sand composite that resisted conventional solvent soaking. Keertek tested a dual-frequency [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":8535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[79],"tags":[],"class_list":["post-8803","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-study"],"acf":[],"_links":{"self":[{"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/posts\/8803","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/comments?post=8803"}],"version-history":[{"count":0,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/posts\/8803\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/media\/8535"}],"wp:attachment":[{"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/media?parent=8803"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/categories?post=8803"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/keertek.com\/pt\/wp-json\/wp\/v2\/tags?post=8803"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}