Rear casing assembly manufacturing method capable of solving problems of deformation and cracking

Abstract

The invention provides a rear casing assembly manufacturing method capable of solving the problems of deformation and cracking and belongs to the technical field of aero-engine part manufacture. When webs and supporting board heads are preassembled, welding joint shrinkage deformation is considered in the preassembly size aspect, it is guaranteed that the size generated after welding operation is identical to the design size of an outer casing, shrinkage stress can not be generated on welding joints, stress concentration is avoided, and cracks are prevented from being generated. Due to the fact that shrinkage stress can not be generated on the welding joints, the situation that a front installation edge and a rear installation edge are deformed due to the shrinkage stress effect is avoided; an inner ring and a flat supporting board pipe are preassembled and welded, the flat supporting board pipe with the inner ring and the supporting board heads of the outer casing are assembled and welded in a butt joint mode, the welded flat supporting board pipe bears tensile stress, the tensile stress exactly counteracts pressure stress borne by the flat supporting board pipe in the operation process of an engine, the stress concentration force receiving state is reduced, and cracks and deformation are avoided. In the thermal treatment process, structural stress is distributed in a balanced mode through a thermal treatment clamp and the situation that a rear casing assembly is deformed due to stress release is avoided.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aero-engine components, in particular to a method for manufacturing a rear case assembly capable of solving the problems of deformation and cracks. Background technique [0002] As an important load-bearing part of an aero-engine, the rear casing assembly is mainly composed of an inner ring, an outer casing and a flat tube of a support plate, and the outer casing includes a front mounting edge, a rear mounting edge, a web and a support plate head, and the rear The number of welding seams of the casing components is large and the structure is complex. The working environment of the rear casing components is also complicated. The high-temperature air flow between the inner ring and the inner ring tends to expand, and the flat tube of the support plate needs to bear the strong compressive stress from the inner ring and the outer casing. The rear casing assembly produced according to the tradit...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the present invention provides a manufacturing method of the rear case assembly that can solve the problems of deformation and cracks. When pre-assembling the web and support plate head, the shrinkage deformation of the weld seam is taken into consideration during the pre-assembly Among the dimensions, when electron beam welding is carried out, the size after welding can be guaranteed to be consistent with the design size of the outer casing; the inner ring and the support plate flat tube are assembled and welded first, and then the support plate flat tube with the inner ring and the outer casing are assembled and welded. The support plate head is butt-jointed and welded, and the welded support plate flat tube bears tensile stress, which can just offset the compressive stress on the support plate flat tube during engine operation, thereby reducing the stress concentration of the rear casing assembly; Finally, during the heat treatment process, the heat treatment fixture is used to clamp and position the rear casing assembly, so that the structural stress of the rear casing assembly is balanced and distributed, and the deformation of the rear casing assembly caused by stress release is avoided.

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