Machine tool castings can also be called large castings. Sand casting is preferred for castings. The main reason is that sand casting is lower in cost, simple in production process, and shorter in production cycle than other casting methods. When the sand type cannot meet the requirements, consider using clay sand surface dry sand type, dry sand type or other sand types. Machine tool castings are manufactured according to the standard GB9439-88.
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Item：MACHINE TOOL CUSTOM PARTS
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ⅠSince graphite in cast iron is good for lubrication and oil storage, it has good wear resistance and shock absorption.
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Ⅱ. Good process performance. Due to the high carbon content of gray cast iron, which is close to the eutectic composition, the melting point is relatively low, the fluidity is good, and the shrinkage rate is small. Therefore, it is suitable for casting complex structures or thin-walled castings. In addition, because graphite makes it easy to form chip breakage during cutting, the machinability of gray cast iron is better than that of steel.
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Ⅰ. The resin sand mold has good rigidity and high sand mold strength at the initial stage of pouring. This makes it possible to use the graphitization expansion of the cast iron solidification process to effectively eliminate shrinkage and shrinkage defects, and achieve fewer and no risers for gray cast iron and ductile iron parts. Casting.
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Ⅱ. In the production of solid casting, the polystyrene foam pattern is used to form the self-hardening sand of Weibu resin. When molten metal is poured into the mold, the foamed plastic pattern quickly vaporizes under the action of the high-temperature molten metal, burns and disappears, and the molten metal replaces the original foamed plastic, and cools and solidifies into a solid casting with the same shape as the pattern.
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Ⅲ. Relatively speaking, lost foam casting has great advantages over traditional sand molds for the production of single or small batches of automobile covering parts, machine tool beds and other large molds. It not only saves expensive wood mold costs, but also facilitates operation. , It shortens the production cycle, improves the production efficiency, and has the advantages of high dimensional accuracy, small machining allowance, and good surface quality.
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