Casting method of metal alloy casting

Abstract

The invention provides a casting method of a metal alloy casting. The casting method comprises the following steps that a corresponding mould shell is prepared according to the shape of the metal alloy casting, a corresponding alloy raw material is prepared according to the material of the metal alloy casting, the alloy raw material is smelted to prepare alloy metal liquid, a proper amount of grain refiner is added into the alloy metal liquid, a mould material is obtained after uniform mixing, the mould material is poured into the mould shell through an investment casting process, and the metal alloy casting is obtained. Preferably, the composition of the grain refiner is aluminum titanium boron. By adopting the technical scheme, the aluminum titanium boron is used as the grain refiner toreplace an aluminum strontium modifier commonly used in the prior art, the elements such as aluminum, titanium and boron in the aluminum titanium boron grain refiner are lower in activity so as not likely to chemically react with other elements in the alloy raw material, so that the grains can be more fully refined, corresponding pinhole defects generated in the casting forming process of the casting can be avoided, and the forming quality, the mechanical property and the mechanical property of the finished casting are improved.

Description

technical field [0001] The invention relates to the technical field of investment casting technology, in particular to a casting method of metal alloy castings. Background technique [0002] With the continuous development of mechanical processing and manufacturing technology, people's requirements for mechanical parts and components are getting higher and higher, and the shapes and structures of products manufactured through mechanical processing are becoming more and more diverse. However, in the investment casting molding process of some alloy metals, the castings are prone to pinhole defects, which affect the performance of the finished castings, and have to be scrapped, causing a great waste of resources. In the prior art, in order to overcome the pinhole defects generated during the casting process, the corresponding grain refiner is usually added to the corresponding alloy metal liquid during the pouring process. Most of the existing grain refiners are It is an alumi...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of mechanical processing and manufacturing technology, people's requirements for mechanical parts and components are getting higher and higher, and the shapes and structures of products manufactured through mechanical processing are becoming more and more diverse. However, in the investment casting molding process of some alloy metals, the castings are prone to pinhole defects, which affect the performance of the finished castings, and have to be scrapped, causing a great waste of resources. In the prior art, in order to overcome the pinhole defects generated during the casting process, the corresponding grain refiner is usually added to the corresponding alloy metal liquid during the pouring process. Most of the existing grain refiners are It is an aluminum strontium modifier. However, the amount of the aluminum strontium modifier must be strictly controlled when used, and the aluminum, strontium and other metal components in the aluminum strontium modifier have high mobility and are easily mixed with other alloys in the alloy metal liquid. The components react chemically, so that the pinhole defects still partially exist in the casting, which affects the molding quality and mechanical properties of the finished casting. In the prior art, when aluminum strontium modifier is added during the investment casting molding process of aluminum alloy castings, The metallographic structure of the obtained finished casting is as follows figure 1 shown, from figure 1 It can be seen from the figure that the columnar grains in the metallographic structure of the casting are coarse, although the distribution is relatively uniform, but the grains are not sufficiently refined, which affects the quality of the finished casting

Images