Technical method for repairing block falling defect of flap sliding rail chromium-plated surface through laser cladding

Abstract

The invention relates to a technical method for repairing a block falling defect of a flap sliding rail chromium-plated surface through laser cladding, and belongs to the technical field of laser processing. The method is mainly used for repairing abrasion defects of an airplane flap sliding rail. According to the method, ultra-high-strength steel powder good in weldability and good in abrasion resistance is selected to serve as a cladding material for a 30CrMnSiNi2A ultra-high-strength steel workpiece, and reasonable laser cladding process parameters are adopted to repair the sliding workingsurface of the flap sliding rail. A chromium-plated layer of the non-repair surface in the repair process does not fall off; no crack defect exists on the repair portion; and the abrasion resistance of a repair structure is equivalent to that of an original matrix material, so that the service life of the workpiece is prolonged. A certain type of airplane flap sliding rail repaired through the method has been installed and applied.

Description

technical field [0001] The invention relates to a process method for repairing the block-off defects on the chrome-plated surface of flap slide rails by laser cladding, belongs to the technical field of laser processing, and is mainly used for repairing wear defects of flap slide rails of aircraft. Background technique [0002] A certain type of aircraft flap rail is precision forged with 30CrMnSiNi2A ultra-high-strength steel and has a chrome-plated layer on the sliding working surface. The deformation and the change of position accuracy affect the sliding compliance and cause the wear of the local sliding surface to form a block defect. The average depth of the falling block defects on the sliding working surface does not exceed 1mm, and the defect outline is irregular and the distribution is irregular. Faults such as local block drop pits appear on the sliding working surface of the flap slide rail, and the defects usually need to be repaired by fusion welding. Previous...

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Problems solved by technology

Previously, such defects were mainly repaired by argon arc welding. However, due to the difference in thermal expansion between the ultra-high-strength steel substrate and the chrome-plated layer during welding, the chrome-plated layer is likely to fall off under the high heat input of argon-arc welding, thus making 30CrMnSiNi2A steel Exposure to Corrosion Risk

At the same time, the sliding working surface of the flap slide rail is a streamlined smooth surface, and the depth and size of local wear pit defects are small. When repairing with argon arc welding wire, it is difficult to control the repair trajectory and the size and thickness of the repair area. Machining and grinding cause some trouble

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