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resin sand casting

Common defects and preventive measures in the use of resin sand

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If furan resin self-hardening sand is used improperly, casting defects such as pores, mechanical sand sticking, and mold sticking often occur. 1. Generation and prevention measures of pores During metal solidification, trapped bubbles form pores in the casting. The shape, wall characteristics, surface texture, and location of pores help distinguish them from shrinkage, sand holes, […]

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cast-iron

What does the manufacturing process of cast iron include?

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1. Material selection and quality Raw materials: The main production materials of cast iron are pig iron and recycled materials. Pig iron is usually obtained by smelting in a blast furnace, while recycled materials mainly come from the pouring system and scrap iron parts. The quality of these raw materials directly affects the final quality

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Aging treatment of machine tool castings

Why do machine tool castings need aging treatment?

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Aging treatment of machine tool castings is an important part of the casting process. It aims to eliminate residual stress inside the castings through a series of measures, stabilize their size and organizational structure, and thus improve the mechanical properties and service life of the castings. The following is a detailed analysis of aging treatment

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Heat treatment methods for ductile iron

Heat treatment methods for ductile iron

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Ductile iron, known for its excellent strength and toughness, undergoes various heat treatment methods to enhance its mechanical properties. Common techniques include annealing, normalizing, and tempering. Annealing helps to reduce stress and improve ductility by decomposing cementite, while normalizing refines the microstructure by controlling cooling rates. Tempering is often applied after quenching to relieve internal

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Chunky-graphite

Formation Principle and Preventive Measures of Chunky Graphite

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Chunky graphite is one of the common defects of thick and large-section ductile iron castings, which significantly affects the mechanical properties of castings. The chunky graphite phenomenon is currently a topic of great concern in the research and production of thick and large-section ductile iron in the world, but its formation mechanism is still not very clear.

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