Composite connection method for large-size round-to-square 3D printer box

Abstract

The invention discloses a composite connection method for a large-size round-to-square 3D printer case. The method comprises the following steps: step 1, according to a connection section structure of the 3D printer case, adopting a welding mode which takes electron beam welding as a main welding mode and takes laser cladding as an auxiliary welding mode; step 2, removing external reinforcing ribs at the longitudinal electron beam welding seam positions in the 3D printer case connecting sections; step 3, welding longitudinal weld joints to all the 3D printer case connecting sections through electron beam welding; step 4, repairing the external reinforcing ribs removed in the step 2 through laser cladding; and step 5, compositely connecting the fifth connecting section of the 3D printer box, and completing composite connection of the 3D printer box. By adopting a composite connection process which takes electron beams as a main part and laser cladding as an auxiliary part, welding deformation is reduced to the greatest extent. The electron beam welding is selected for main longitudinal welding seams, the laser cladding welding is adopted for other parts which cannot be reached by the electron beam welding, grooves do not need to be machined in the electron beam welding process, and the welding efficiency can be effectively improved.

Description

technical field [0001] The invention belongs to the field of manufacturing non-rotating casings of aero-engines, in particular to a compound connection method for large-size circular-rotary-square 3D printing casings. Background technique [0002] The round-to-square casing is the main force-bearing and pressure-bearing part of the nozzle of a certain type of aero-engine. Its outer dimension is relatively large (1140mm), and its material is GH4169. The air inlet is circular, the exhaust port is rectangular, and it is a thin-walled non-rotating special-shaped curved surface casing. The exhaust port has a large downward eccentricity relative to the air intake port, forming a curved surface shape of the inner runner with a large curvature change. In order to ensure that the casing has sufficient strength and rigidity, many criss-crossing and "meter" shaped ribs of different depths are added to the outer surface of the casing, which makes the casing structure extremely complica...

AI Technical Summary

Problems solved by technology

[0005] The connection of the 3D-printed sector of the GH4169 material is a new structure and new process, and there is no mature method for reference. Therefore, it is necessary to study a feasible, efficient and economical connection method

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