Method for improving manufacturing precision of components at head switching section of annular flame cylinder

Abstract

The invention discloses a method for improving the manufacturing precision of components at a head switching section of an annular flame cylinder. The method comprises the following steps of first, pre-forming the head switching section to form a primary head switching section with a turbulator mounting hole, meanwhile pre-processing an internal cooling ring and an external cooling ring to form an internal cooling ring coarse structure and an external cooling ring coarse structure, and separately welding the internal cooling ring coarse structure and the external cooling ring coarse structure to the primary head switching section to form primary welding components; and positioning the profile of the formed head switching section and the turbulator mounting hole, and processing and forming the internal cooling ring coarse structure and the external cooling ring coarse structure to form a final internal cooling ring and a final external cooling ring. At first, the head switching section is pre-formed, and the head switching section is finally formed in the component state, so that the influence of welding deformation and heat treatment deformation on the profile tolerance of the head switching section and the location degree of the turbulator mounting hole is avoided, the manufacturing precision of the component is improved, and meanwhile, the method is higher in production efficiency.

Description

technical field [0001] The technology belongs to the field of aero-engine manufacturing, and in particular relates to a method for improving the manufacturing precision of an annular flame cylinder head adapter section assembly. Background technique [0002] Annular flame tube is the mainstream structure of aero turbine engine flame tube. The structural feature of the annular flame tube is that the inner wall and the outer wall form an annular air flow channel. At the front end of the annular channel, the inner wall and the outer wall are connected together through the head adapter section, and the fuel nozzle and the swirl are evenly installed on the head adapter section. In order to ensure the stable combustion of the high-pressure and high-speed airflow in the flame tube, at each position where the vortex generator is installed, the local profile of the head adapter section is generally designed as a forward-convex trumpet shape, so that the head adapter section becomes ...

AI Technical Summary

Problems solved by technology

[0004] During the manufacturing process of the head adapter section assembly, due to the two girth welds (the first girth weld 4 and the second girth weld 5) connecting the head adapter section 1 with the inner cooling ring 2 and the outer cooling ring 3 The welding stress and welding deformation are relatively large. In addition, the welding residual stress is released during the post-weld heat treatment process. After heat treatment, the deformation of the head transition section is large, and the profile is more out of tolerance. Many, can not guarantee the design requirements

[0005] In order to improve the manufacturing accuracy of components, a lot of improvement work has been done in controlling welding deformation and welding stress, such as: improving the forming accuracy of the head transition section, reducing the butt gap and misalignment of welding seams, improving welding fixtures, and optimizing welding parameters etc., but little deformation control effect

[0006] In order to ensure the position of the vortex generator, for a long time, the method of fitter calibration has been adopted to correct the profile of the head adapter section and the installation hole of the vortex generator, but the stability of the manual calibration process is very poor, which has a great impact on product quality. At the same time, Repeated calibration leads to very low production efficiency

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