Integral precision casting method for large thin-wall casing part

Abstract

The invention relates to the field of precision casting methods, in particular to an integral precision casting method for a large thin-wall casing part. The production cost is saved, the production period is shortened, and the thrust-weight ratio of the casing part is greatly improved. The technical scheme comprises the following steps of: designing a computer model of a wax mould, and preparingthe wax mould according to the computer model, wherein the process parameters are that: the wax material temperature is 68DEG C, the injection pressure is 2-3MPa, and the hold up time is 180-200 seconds; coating 15 layers of coatings on the surface of the prepared wax mould, spreading sand on the surface after each layer is coated, naturally drying and finally performing air drying, wherein afterthe wax mould is coated with the seventh layer of coating, the coating layer is subjected to one-time hole plugging and net suspension; after the coating is finished, dewaxing and sintering to obtaina casing part shell; casting at the temperature of between 1,550 and 1,570DEG C for 22 to 27 seconds to obtain a casing casting; and performing hot shape correction on the casing casting.

Description

technical field [0001] The invention relates to the field of precision casting methods, in particular to an integral precision casting method for a large thin-wall casing. Background technique [0002] The casing parts in aero-engines have large diameters, generally above Φ800 mm, thin walls, complex structures, and high-temperature alloys. The traditional manufacturing process of this type of parts is: use different processing technology to process each single part, and then use welding processing method to assemble and weld the whole casing. This casing processing and forming method occupies a large amount of production resources, has a long processing cycle, a large waste of metal materials, high cost, and heavy parts. [0003] The outline size of a high-temperature alloy casing casting is Φ900mm, and the main body wall thickness is 2mm. Uneven, complex structure, one-time pouring of castings, internal metallurgical quality control, and size assurance of large thin-wall...

AI Technical Summary

Problems solved by technology

This casing processing and forming method occupies a large amount of production resources, the processing cycle is long, the waste of metal materials is large, the cost is high, and the weight of the parts is heavy.

[0003] The outline size of a high-temperature alloy casing casting is Φ900mm, and the main body wall thickness is 2mm. Uneven, complex structure, one-time pouring of castings, internal metallurgical quality control, size assurance of large thin-walled parts and other processes are quite difficult