Lift tube for casting

Abstract

The invention relates to a lift tube for casting. The lift tube is used for enabling a cavity to be filled with metal liquid in a foundry furnace in the low-pressure casting process so that castings can be formed. The lift tube for casting comprises a ceramic part and a metal part, and the metal part is located on the ceramic part. The lower end of the metal part is connected with the upper end of the ceramic part through threads, the lower middle portion of the ceramic part stretches into the metal liquid in the foundry furnace, and the metal part is not in contact with the metal liquid in the foundry furnace. The lower end of the ceramic part is closed, and a circle of through holes are evenly formed in the side wall, close to the lower end, of the ceramic part at intervals. According to the lift tube for casting, the lifting tube is divided into the ceramic part and the metal part, and on the premise that the quality of the castings is guaranteed, the cost is saved; in addition, the end, being not connected with the iron part, of the ceramic part is closed, the circle of through holes are evenly formed in the side wall of the closed end of the ceramic part, and thus the metal liquid can be prevented from flowing back.

Description

technical field [0001] The invention relates to the field of casting, in particular to a casting riser. Background technique [0002] When the riser is used in low-pressure casting, the mold is connected to the upper end of the riser with bolts and gaskets, and the lower end of the riser is about 50 cm, immersed in the melting furnace, and the solution temperature reaches 785°C±5°C. At present, there are the following types of riser pipes commonly used: one is iron structure, and this kind of riser pipe will produce iron corrosion when soaked in aluminum liquid for a long time, which will cause iron increase in aluminum liquid, seriously affecting product quality, and iron structure Corrosion will cause damage to the riser pipe; the other is graphite structure, but it is easy to wear and break due to its poor load-bearing capacity and wear resistance; the other is ceramic structure, but it needs to be imported, and each piece is more than 10,000 yuan. higher cost. [0003]...

AI Technical Summary

Problems solved by technology

At present, there are the following types of riser pipes commonly used: one is iron structure, and this kind of riser pipe will produce iron corrosion when soaked in aluminum liquid for a long time, which will cause iron increase in aluminum liquid, seriously affecting product quality, and iron structure Corrosion will cause damage to the riser pipe; the other is graphite structure, but it is easy to wear and break due to its poor load-bearing capacity and wear resistance; the other is ceramic structure, but it needs to be imported, and each piece is more than 10,000 yuan. higher cost

[0003] In addition, when the metal liquid flows back, the metal liquid flow directly hits the bottom of the casting furnace, which will form an impact and agitation on the metal at the bottom of the casting furnace, and resuspend the inclusions at the bottom of the sedimentation casting furnace. Liquid flows into the casting, causing inclusion defects in the casting

Images