Wax model blade forming method for precision casting of starting turbine impeller

Abstract

The invention discloses a wax pattern blade molding method used for precise casting of a starting turbine impeller. The wax pattern blade molding method includes the following steps that a, ceramic core compression is conducted on a blade design structure of the starting turbine impeller; b, roasting is conducted on a compressed ceramic core; c, strengthening is conducted on the roasted ceramic core; d, self-inspection is conducted on the strengthened ceramic core, and a next process is conducted on the strengthened ceramic core if the strengthened ceramic core is qualified, and if the strengthened ceramic core is not qualified, the strengthened ceramic core is treated as a scraped core; e, the ceramic core which is qualified after self-inspection is subjected to surface sand blowing; f, the ceramic core obtained after sand blowing is subjected to self-inspection again, a next process is conducted on the ceramic core if the ceramic core is qualified, and the ceramic core is treated as a scraped core if the ceramic core is not qualified; and h, the ceramic core which is qualified after sand blowing is matched with a rebound die to conduct wax pattern compression on a blade, and therefore the molded wax pattern blade is obtained. The problem of seams of starting turbine impeller castings is basically solved, the repair rate is greatly reduced, and the qualification rate is increased nearly by 25%.

Description

technical field [0001] The invention relates to the technical field of precision casting of starting turbine impellers, in particular to a wax mold blade forming method for precise casting of starting turbine impellers. Background technique [0002] The cavity of the impeller blade of the starting turbine includes multiple ceramic cores. Before the ceramic cores are strengthened by sand blowing, the ceramic cores have surface pits, cracks, and miscellaneous powder particles in the exhaust edge. The surface of the cores needs to be Manual trimming requires a lot of work and due to uneven levels of workers' operations, the surface quality consistency after trimming is poor. [0003] The castings produced by the existing method have a probability of broken cores, cast tumors, and batch seams in the early casting stage of more than 90%, resulting in a pass rate of starting turbine impeller castings that was only about 35% at one time; [0004] Each casting of the starting turbi...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a wax mold blade forming method for precision casting of a starting turbine impeller to solve the problem of broken cores, cast tumors and batch seams that are prone to occur in the existing precision casting methods; and manual methods are used for casting broken cores and batch seams. Grinding and trimming requires a lot of work and is not easy to remove. At the same time, it is very easy to cut parts during the grinding and trimming process, resulting in the technical problem of parts being damaged and scrapped.

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