Why do castings produced by gravity casting machines crack?
Release time：2024-12-18
When gravity casting machines produce casting products, it is sometimes found that the casting products may have cracks. Casting products with cracks cannot be improved through secondary processing, and can only be scrapped and remade as scrap, which inevitably increases the production cost of the manufacturer. To solve this problem, let's first understand the cause of the crack together.
When the casting product shrinks, it is hindered or restricted by the gravity casting mold and the structure of the casting product, because the metal has no yielding ability, it will form shrinkage cracks or tensile cracks. In the production process of gravity casting machines, the volume of the molten metal shrinks and shrinks inward when it solidifies. When it touches the inner cavity sand core or the expanding sand core, it can also cause cracks in the casting product.
Uneven composition of the metal liquid structure used in production can also lead to uneven stress and crack formation. Improper temperature during the production of gravity casting machine can lead to rapid cooling of castings and also cause cracks in the castings. Simply put, cracks are usually caused by the resistance or force exerted on the liquid metal during contraction. Follow Kuntai Casting Machine to learn how to solve cracks in gravity casting machines.
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