High-precision casting die

Abstract

The invention discloses a high-precision casting die. The casting die is a resin sand die. The resin sand die comprises an upper moulding box, a lower moulding box, a cavity and a runner; the cavity is positioned between the upper moulding box and the lower moulding box; the runner communicates with the cavity and a sprue gate; a graphite coating is attached to the inner wall of the cavity; and the resin sand die comprises the following components in percentages by mass: 70%-75% of quartz sand, 14%-18% of furan resin, 7%-10% of a curing agent, and 3%-5% of a silane coupling agent. Through the mode, the high-precision casting die has the features of high hardness and high precision, so that the casted castings are smooth in surface, clear in edges and corners and high in dimensional precision.

Description

technical field [0001] The invention relates to the field of casting molds, in particular to a high-precision casting mold. Background technique [0002] According to statistics, 60-70% of all castings produced in my country are produced with sand molds, and about 70% of them are produced with clay sand molds. The main reason is that sand mold casting has lower cost and simpler production process than other casting methods. The production cycle is short. Therefore, castings such as engine cylinder blocks, cylinder heads, and crankshafts of automobiles are all produced by clay green sand technology. When the wet mold cannot meet the requirements, consider using clay sand surface dry sand mold, dry sand mold or other sand molds. The weight of castings produced by clay green sand casting can range from a few kilograms to tens of kilograms, while the weight of castings produced by clay dry molding can reach tens of tons. [0003] Generally speaking, for medium and large castin...

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, for medium and large castings, resin self-setting sand molds can be used, but the precision of resin self-setting sand molds is not high, resulting in poor surface finish and low dimensional accuracy of cast castings.