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Resin sand is generally used on small cast-iron platforms . On the one hand, it is to facilitate sand removal, and for the following reasons:
First, relatively speaking, lost foam casting has a great advantage over traditional sand molds in the production of single pieces or small batches of automobile cover parts and machine tool beds. It not only saves expensive wood mold costs, but also facilitates operation. , Shorten the production cycle, improve production efficiency, with high dimensional accuracy, small machining allowance, good surface quality and other advantages.
Second, the resin sand mold has good rigidity, and the sand mold has high strength in the early stage of casting. This condition can use the graphitization expansion of the solidification process of cast iron to effectively eliminate shrinkage and shrinkage defects, and achieve fewer and no risers for gray cast iron and nodular cast iron. Casting.
Third, the solid casting production uses polystyrene foam pattern to apply furfur resin self-hardening sand modeling. When the 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. The molten metal replaces the position occupied by the original foamed plastic, and cools and solidifies into a solid casting with the same shape as the pattern.
Explanation of related terms in this article
• Resin sand Resin sand refers to molding sand or core sand with synthetic resin as the binder of sand particles. After the resin sand is used to make a mold or core, the resin undergoes an irreversible cross-linking reaction and is cured by the action of a hardening agent, thereby giving the mold or core the necessary strength.
• Cast iron Word: Cast iron foundry Pinyin: zhù tiě [cast iron; foundry iron; foundry pig] Iron with high carbon content, brittle, cannot be forged, and is used to make steel or cast utensils. Detailed explanation 1. Smelting iron ore into iron. "Hanshu · The Five Elements": "In the second year of Chengdi Heping, the Peijun iron official cast iron, the iron is not strong, the rumble is like thunder, and it is like the sound of a drum." Widespread authenticity, submarines gushing out, setting up cast iron, holding the gangster. The thief then told: "Don't fear the city, but fear the Yanggong Iron Star." "Cast iron has been wrong for a long time, and reading is a shame for the children." 2. An iron-carbon alloy re-melted from pig iron. Also called pig iron or mill iron. Definition: It uses cast pig iron as raw material and is directly cast into castings after remelting. It is an iron-carbon alloy with carbon content> 2%.
• Sand mold The cavity of a casting made of raw sand, binder and other auxiliary materials in casting production is called sand mold. According to the different binders used: clay sand, self-hardening resin sand, self-hardening water glass sand. According to the difference in the bonding mechanism of the sand mold itself, the sand mold can be divided into three types, namely mechanical bonding, chemical bonding and physical bonding. During the molding process, the molding sand is formed under the effect of external force and reaches a certain degree of compactness or density to become a sand mold.