Gravity pouring investment casting method

Abstract

The invention provides a gravity pouring investment casting method. The gravity pouring investment casting method comprises the steps of acquiring a vibration table, preparing a corresponding mold shell according to the shape of a casting to be manufactured, and placing the mold shell on the vibration table; then preparing a corresponding metal raw material according to the material of the castingto be manufactured, smelting the metal raw material to prepare metal liquid, and starting the vibration table to enable the mold shell to vibrate along with the high-frequency vibration table; and meanwhile, pouring the metal liquid into the mold shell through an investment casting process, and obtaining the casting after the metal liquid is condensed. According to the technical scheme, the moldshell vibrates along with the vibration table, so that the metal liquid poured in the mold shell vibrates along with the vibration table as well, the growth direction of crystal grains in the metal liquid is interrupted, and the crystal grains in the metal liquid are refined; the dissolved gas in the metal liquid can escape, and the defect that pinholes or gas holes are generated on the surface ofa casting after the metal liquid is condensed is avoided; and the molding quality of the finished product casting and the mechanical properties of the casting are improved.

Description

technical field [0001] The invention relates to the technical field of investment casting technology, in particular to a gravity pouring investment casting method. 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 al...

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 chemical reaction of the ingredients makes the pinhole defects still partially exist in the casting, which affects the molding quality and mechanical properties of the finished casting, and the preparation process of the grain refiner is complicated, resulting in the high cost of the casting molding process

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