Centrifugal casting method for irregular titanium thin-wall casting

Abstract

The invention relates to a centrifugal casting method for an irregular titanium thin-wall casting. The centrifugal casting method for the irregular titanium thin-wall casting comprises the steps of manufacturing of a mold shell, metallic titanium melting, mold shell casting, centrifugal injection, solidification, shell removal, riser removal, overall heat treatment, grinding and the like. Rapid filling at the thin wall position of the thin-wall titanium casting can be realized by centrifugation, the uniformity of texture of a casting material at the thin wall position is ensured, meanwhile a high-temperature resistant layer which is prepared by mixing yttrium oxide with zirconium oxide is arranged in the mold shell, the stability and smoothness of the surface of the thin wall of the casting are ensured, temperature compensation before injection and an insulation layer outside the mold shell ensure temperature maintenance during the injection process, and the fluidity of injected metalliquid is ensured.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a centrifugal casting method for titanium metal irregular thin-walled castings. Background technique [0002] Titanium and titanium alloys are widely used in many fields such as aviation, aerospace, chemical industry, and medical treatment due to their excellent performance. Titanium and titanium alloy casting products are also increasingly used by many industries, thus gradually replacing the original product materials. [0003] The density of titanium is slightly higher than that of aluminum, and much lower than that of steel, iron, copper and other metals. According to the difference in metal density, melting point, and chemical properties, in the casting process, metal aluminum can be realized by die-casting, while metals such as steel, iron, and copper can be realized by gravity casting of a single-group shell in the atmosphere. Since titanium alloys cannot be in contact with a...

AI Technical Summary

Problems solved by technology

Titanium alloys are poured by gravity in a vacuum state. Due to the low density of the material, a large "metal pressure head" must be used for casting during the pouring process, which seriously wastes raw materials and the casting effect is not ideal.

Moreover, for some thin-walled parts, it is more likely to cause a large area of ​​the casting to fail to be fully cast, causing parts to be scrapped, and the resulting economic loss is very serious; for some thick-walled pressure-bearing parts, feeding risers cannot be added, resulting in casting defects It is relatively large. After hot isostatic pressing, the casting needs to be repaired and repaired in a large area, which seriously affects the work efficiency. At the same time, in the process of casting, due to the high activity of titanium metal, it often occurs Chemical reactions occur on the surface of castings, resulting in poor stability