{"id":779,"date":"2026-04-11T03:02:59","date_gmt":"2026-04-11T03:02:59","guid":{"rendered":"https:\/\/sjnbcasting.com\/?p=779"},"modified":"2026-04-20T03:08:06","modified_gmt":"2026-04-20T03:08:06","slug":"manufacturing-processes-and-considerations-for-ferrous-casting","status":"publish","type":"post","link":"https:\/\/sjnbcasting.com\/pt_br\/manufacturing-processes-and-considerations-for-ferrous-casting\/","title":{"rendered":"Processos de fabrica\u00e7\u00e3o e considera\u00e7\u00f5es sobre fundi\u00e7\u00e3o de metais ferrosos"},"content":{"rendered":"

A fundi\u00e7\u00e3o de metais ferrosos \u00e9 um processo de fabrica\u00e7\u00e3o fundamental que envolve o vazamento de ligas ferrosas fundidas (principalmente ligas \u00e0 base de ferro) em um molde pr\u00e9-fabricado, seguido de resfriamento e solidifica\u00e7\u00e3o para formar pe\u00e7as fundidas com formas, tamanhos e propriedades mec\u00e2nicas espec\u00edficas.<\/p>\n

Como tecnologia fundamental na ind\u00fastria de manufatura, ela \u00e9 amplamente utilizada em diversos campos devido \u00e0 sua rela\u00e7\u00e3o custo-benef\u00edcio, adaptabilidade e capacidade de produzir componentes com formas complexas.<\/p>\n

\n

Principais tipos e aplica\u00e7\u00f5es de fundi\u00e7\u00e3o de metais ferrosos<\/h2>\n
\n
\n\n\n\n\n\n\n\n\n
Tipo<\/td>\nCaracter\u00edsticas principais<\/td>\nAplica\u00e7\u00f5es t\u00edpicas<\/td>\n<\/tr>\n
Ferro fundido cinza<\/td>\nGrafite em escamas, boa absor\u00e7\u00e3o de choques, f\u00e1cil processamento, baixo custo<\/td>\nBlocos de motor, discos de freio, bases de m\u00e1quinas-ferramentas, carca\u00e7as de bombas<\/td>\n<\/tr>\n
Ferro fundido d\u00factil<\/td>\nTratamento de esferoidiza\u00e7\u00e3o, grafite esf\u00e9rica, excelente resist\u00eancia e tenacidade<\/td>\nVirabrequins, engrenagens, tubula\u00e7\u00f5es de alta press\u00e3o, tampas de bueiros<\/td>\n<\/tr>\n
Ferro fundido branco<\/td>\nAlta dureza, boa resist\u00eancia ao desgaste, extremamente fr\u00e1gil<\/td>\nEsferas de moagem, revestimentos de moinhos, pe\u00e7as resistentes ao desgaste<\/td>\n<\/tr>\n
Ferro fundido male\u00e1vel<\/td>\nRecozido para obter grafite floculante, com boa tenacidade<\/td>\nAcess\u00f3rios para tubula\u00e7\u00e3o, suportes, pe\u00e7as para m\u00e1quinas agr\u00edcolas<\/td>\n<\/tr>\n
A\u00e7o fundido<\/td>\nBaixo teor de carbono, alta resist\u00eancia, boa resist\u00eancia ao impacto<\/td>\nEstruturas para servi\u00e7os pesados, m\u00e1quinas de constru\u00e7\u00e3o, vasos de press\u00e3o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Fluxo do processo de fundi\u00e7\u00e3o de metais ferrosos<\/h2>\n

A fundi\u00e7\u00e3o de metais ferrosos refere-se principalmente \u00e0 produ\u00e7\u00e3o de pe\u00e7as fundidas de ferro fundido e a\u00e7o fundido. O fluxo geral do processo \u00e9 semelhante. A seguir, apresentamos um processo de produ\u00e7\u00e3o organizado e claro, adequado para documentos t\u00e9cnicos ou comunica\u00e7\u00e3o com clientes no exterior.<\/p>\n

I. Vis\u00e3o geral do fluxo do processo como um todo<\/h3>\n

1. Projeto de processos e fabrica\u00e7\u00e3o de moldes
\n2. Moldagem \/ Fabrica\u00e7\u00e3o de n\u00facleos
\n3. Fus\u00e3o do ferro fundido \/ do a\u00e7o fundido
\n4. Servir
\n5. Agita\u00e7\u00e3o e limpeza
\n6. Tratamento t\u00e9rmico
\n7. Acabamento, inspe\u00e7\u00e3o e armazenamento<\/p>\n

II. Descri\u00e7\u00e3o detalhada das etapas<\/h3>\n

1. Projeto de processos e fabrica\u00e7\u00e3o de moldes
\n– Design the casting process according to the part drawing: determine the gating system, riser, shrinkage rate, wall thickness, etc.
\n– Make wooden molds\/metal molds\/plastic molds.
\n– For investment casting (fundi\u00e7\u00e3o de precis\u00e3o<\/a>), fa\u00e7a primeiro os moldes de cera.<\/p>\n

2. Moldagem e fabrica\u00e7\u00e3o de n\u00facleos
\n– Molding: Make the mold using molding sand, resin sand, sodium silicate sand, etc.
\n– Core making: Make the sand core to form the internal cavity structure of the casting.
\n– Assemble the mold and lock it for pouring.<\/p>\n

3. Fus\u00e3o de pe\u00e7as fundidas ferrosas
\n– Melt pig iron, return scrap, and steel in equipment such as cupola and intermediate frequency electric furnace.
\n– Adjust the composition: carbon, silicon, manganese, sulfur, phosphorus and alloying elements.
\n– For ductile iron, spheroidization treatment and inoculation treatment are also required.<\/p>\n

4. Fundi\u00e7\u00e3o de metais ferrosos \u2013 Inje\u00e7\u00e3o
\n– Pour high-temperature molten iron\/molten steel (about 1350\u20131450\u2103 for cast iron, higher for cast steel) into the mold.
\n– Control the pouring temperature and speed to avoid blowholes, inclusions and insufficient pouring.<\/p>\n

5. Agita\u00e7\u00e3o e limpeza
\n– After the casting is cooled, unpack and shake out to remove the molding sand.
\n– Cut off the gating system and riser.
\n– Remove surface oxide scale and burrs by shot blasting\/sand blasting.<\/p>\n

6. Tratamento t\u00e9rmico
\nTanto o ferro fundido quanto o a\u00e7o fundido geralmente exigem tratamento t\u00e9rmico para melhorar o desempenho:
\n– Gray cast iron: Stress relief annealing
\n– Ductile iron: Annealing, normalizing, quenching and tempering
\n– Cast steel: Normalizing, tempering, quenching and tempering, etc.
\nObjetivo: Melhorar a resist\u00eancia e a tenacidade, eliminar a tens\u00e3o interna e estabilizar as dimens\u00f5es.<\/p>\n

7. Acabamento e inspe\u00e7\u00e3o
\n– Grind and correct deformation.
\n– Dimensional inspection and mechanical property testing.
\n– Non-destructive testing (UT\/MT\/PT, etc.).
\n– After passing the inspection, it can be machined or delivered directly.<\/p>\n

III. Breve resumo (adequado para divulga\u00e7\u00e3o externa)<\/h3>\n

O processo de fundi\u00e7\u00e3o de metais ferrosos \u00e9 o seguinte: Primeiro, fazer o molde \u2192 Fazer o molde de areia \u2192 Derreter o ferro\/a\u00e7o \u2192 Despejar na cavidade para resfriamento \u2192 Limpar a areia e remover o sistema de alimenta\u00e7\u00e3o e o cano de alimenta\u00e7\u00e3o \u2192 Refor\u00e7ar por meio de tratamento t\u00e9rmico \u2192 Inspecionar e entregar ap\u00f3s a aprova\u00e7\u00e3o.<\/p>\n

\"Manufacturing<\/a><\/p>\n<\/div>\n

Pontos-chave para a moldagem e a fabrica\u00e7\u00e3o de n\u00facleos na fundi\u00e7\u00e3o de metais ferrosos<\/h2>\n

Na fundi\u00e7\u00e3o de metais ferrosos (incluindo ferro fundido e a\u00e7o fundido), a moldagem e a fabrica\u00e7\u00e3o de n\u00facleos s\u00e3o os dois processos mais cr\u00edticos que determinam a apar\u00eancia, a precis\u00e3o dimensional e os defeitos internos das pe\u00e7as fundidas. A neglig\u00eancia em qualquer um desses processos pode facilmente levar a defeitos como bolhas, inclus\u00f5es de areia, deforma\u00e7\u00e3o, ader\u00eancia de areia e desvio dimensional.<\/p>\n

A seguir, apresentamos os pontos-chave que devem ser observados na produ\u00e7\u00e3o propriamente dita; eles s\u00e3o concisos, pr\u00e1ticos e adequados para inclus\u00e3o em documentos t\u00e9cnicos ou na comunica\u00e7\u00e3o com clientes no exterior.<\/p>\n

Pontos-chave para o processo de moldagem na fundi\u00e7\u00e3o de metais ferrosos<\/h3>\n

1. Controle das propriedades da areia de moldagem
\n– Maintain stable strength, air permeability, moisture content, and compactness of molding sand.
\n– Excessive moisture content will cause blowholes; insufficient moisture content will lead to poor collapsibility of molding sand and easy sand sticking.
\n– Insufficient air permeability will prevent gas from being discharged during pouring, resulting in blowholes and mold gassing.<\/p>\n

2. Manuseio de moldes
\n– The surface of the pattern must be smooth, and a parting agent\/release agent should be properly applied to prevent mold sticking.
\n– Check the pattern size, fillet, and draft angle to avoid mold cavity damage during pattern drawing.
\n– Timely correct deformed patterns; otherwise, castings will have dimensional deviation.<\/p>\n

3. Preenchimento com areia e compacta\u00e7\u00e3o
\n– Compact the sand layer by layer to avoid local looseness or excessive hardness.
\n– Loose sand will cause sand washing, sand inclusions, and mold collapse.
\n– Excessively compacted sand will result in poor air permeability and blowholes.
\n– Focus on compacting corners and thin ribs to prevent sand washing.<\/p>\n

4. Desenho de moldes e reparo de moldes
\n– Draw the pattern stably and vertically to avoid scratching the mold cavity.
\n– Timely repair sand loss, cracks, and loose parts of the mold cavity.
\n– The surface of the mold cavity should be flat and smooth to reduce flash and burrs.<\/p>\n

5. Sistema de v\u00e1lvulas, canos de alimenta\u00e7\u00e3o e ventila\u00e7\u00e3o
\n– The position, size, and direction of the gating system should be reasonable to avoid direct flushing of the molding sand.
\n– The riser should be properly arranged to ensure feeding and prevent shrinkage cavities and shrinkage porosity.
\n– The venting channel should be unobstructed to avoid air trapping and blowhole defects.<\/p>\n

6. Montagem e posicionamento do molde
\n– Ensure accurate positioning of the upper and lower molds to prevent mold shift and core deviation.
\n– Seal the mold assembly gap well to prevent metal runout and flash.
\n– Clean the floating sand in the mold cavity after assembly to avoid sand inclusions.<\/p>\n

Pontos-chave do processo de fabrica\u00e7\u00e3o de n\u00facleos na fundi\u00e7\u00e3o de metais ferrosos<\/h3>\n

1. Propriedades da areia de amostragem
\n– Core sand should have high strength, high temperature resistance, and good collapsibility.
\n– Cast iron and cast steel have high pouring temperatures; core sand with poor high-temperature resistance will cause sand sticking and sintering.
\n– Air permeability must be excellent, as cores are most prone to blowhole defects.<\/p>\n

2. Refor\u00e7o do n\u00facleo e ventila\u00e7\u00e3o
\n– The core reinforcement (core wire) should have sufficient strength to prevent core deformation and fracture.
\n– Venting holes or venting channels must be drilled to ensure gas discharge.
\n– Poor gas discharge will lead to severe internal blowholes and pinholes in castings.<\/p>\n

3. Tamanho e deforma\u00e7\u00e3o do n\u00facleo
\n– Control the core size during core making to prevent warpage and deformation.
\n– Long and thin cores and cantilever cores should be supported to avoid floating and deviation during pouring.
\n– Core deviation will directly cause uneven wall thickness and scrapping of castings.<\/p>\n

4. Secagem e tratamento de superf\u00edcies
\n– Cores must be fully dried; moisture is the primary source of blowholes.
\n– Apply coating (graphite coating, zircon powder coating, etc.) on the core surface:
\nPara evitar que a areia grude;
\nPara melhorar o acabamento superficial das pe\u00e7as fundidas.<\/p>\n

5. Ajuste e fixa\u00e7\u00e3o do n\u00facleo
\n– Set the core in the correct position to ensure uniform wall thickness of the casting.
\n– Fix the core firmly to prevent floating and deviation caused by the buoyancy of molten metal.
\n– Seal the core print gap to prevent metal runout and burrs.<\/p>\n

\"Manufacturing<\/a><\/p>\n

Resumo de Fundi\u00e7\u00e3o Suijin<\/a><\/h2>\n

Em resumo, a fundi\u00e7\u00e3o de ferro \u00e9 um processo confi\u00e1vel, eficiente e econ\u00f4mico processo de fabrica\u00e7\u00e3o<\/a>, que desempenha um papel importante na ind\u00fastria manufatureira global e continuar\u00e1 a se desenvolver com o avan\u00e7o da tecnologia para atender aos requisitos cada vez mais rigorosos de qualidade e desempenho de diversos setores.<\/p>\n

Os pontos principais da moldagem e da fabrica\u00e7\u00e3o de n\u00facleos podem ser resumidos em tr\u00eas frases:
\n1. As propriedades da areia de moldagem\/areia de n\u00facleo s\u00e3o est\u00e1veis, e a permeabilidade ao ar, a resist\u00eancia e a resist\u00eancia a altas temperaturas atendem \u00e0s normas.
\n2. A cavidade\/n\u00facleo do molde apresenta dimens\u00f5es precisas, compacta\u00e7\u00e3o uniforme e ventila\u00e7\u00e3o desobstru\u00edda.
\n3. O conjunto do molde e a fixa\u00e7\u00e3o do n\u00facleo s\u00e3o posicionados com precis\u00e3o e firmemente vedados para evitar que o n\u00facleo flutue, que o molde se desloque e que a areia seja lavada.<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Ferrous casting is a fundamental manufacturing process that involves pouring molten ferrous alloys (primarily iron-based alloys) into a prefabricated mold, followed by cooling and solidification to form castings with specific shapes, sizes, and mechanical properties. As a core technology in the manufacturing industry, it is widely applied in various fields due to its cost-effectiveness, adaptability, […]<\/p>\n","protected":false},"author":1,"featured_media":626,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-779","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"jetpack_featured_media_url":"https:\/\/sjnbcasting.com\/wp-content\/uploads\/2026\/02\/Metal-Prototype-Casting-Process-Principles-Steps-and-Applications.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/779","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/comments?post=779"}],"version-history":[{"count":3,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/779\/revisions"}],"predecessor-version":[{"id":784,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/posts\/779\/revisions\/784"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/media\/626"}],"wp:attachment":[{"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/media?parent=779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/categories?post=779"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sjnbcasting.com\/pt_br\/wp-json\/wp\/v2\/tags?post=779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}