Large cylindrical shell aluminum alloy casting low-pressure casting and shrinking control device

Abstract

The invention discloses a large cylindrical shell aluminum alloy casting low-pressure casting and shrinking control device. The large cylindrical shell aluminum alloy casting low-pressure casting and shrinking control device comprises a sand box, a casting, a pouring system, vibrators and vibration guide rods. The vibration guide rods are connected between a vertical cylinder pouring channel of the pouring system and the sand box. The vibrators are arranged on the outer surface of the sand box. The vibration direction of the vibrators is in line with the direction of the guide rods and tightly connected with the guide rods. The vibrators are adopted for providing a vibration source, the vibration guide rods are used for vibrating and guiding the casting and vibration is generated in the casting. Vibration transmitted by the guide rods is used for eliminating shrinking formed in the casting in the solidifying process. The vibrators vibrate in the normal direction of the outer surface of the cylindrical sand box and the guide rods are arranged in the normal direction of the outer surface of the sand box and coincide with the vibration direction of the vibrators. Meanwhile, the direction of the guide rods is parallel to the normal direction of the outer surface of the casting. According to the large cylindrical shell aluminum alloy casting low-pressure and shrinking control device, the density of the casting is reduced, the tendency to shrinking of the casting is relieved and the qualification rate of the casting is greatly improved.

Description

technical field [0001] The invention relates to a device for controlling shrinkage porosity of aluminum alloy castings with large cylindrical shells in low-pressure casting. Background technique [0002] Shrinkage porosity is a serious defect of castings. Castings are often scrapped due to shrinkage porosity. Therefore, it is a major control object for the internal quality of castings. ZL205A alloy is a high-strength aluminum alloy. Due to its unique high-strength characteristics, Therefore, it has a large number of applications in aviation, aerospace and various industries of the national economy. However, the casting performance of ZL205A alloy is very poor. Therefore, the shrinkage and porosity defects in the casting process are very serious. Although the low-pressure casting method is adopted, the shrinkage and porosity defects are still difficult to control. Therefore, it brings very serious problems to the actual production quality control. , that is, the quality of c...

AI Technical Summary

Problems solved by technology

However, for thin-walled, cylindrical shell aluminum alloy castings, especially the ZL205A alloy, due to the large crystallization temperature range of this alloy, the tendency of mushy solidification is very obvious, and because this alloy has a lot of refiners, therefore, The feeding flow during solidification has a distinct typical two-phase flow, and the above alloy characteristics make feeding of castings difficult

Therefore, in actual production, the method of increasing the pressure during crystallization and applying cold iron is usually used to form a good feeding sequence, and the sequential solidification is used to achieve feeding, and the result is that the effect is not very significant

Images