Non-distortion repairing method for micro-damage of casting alloy part

Abstract

The invention discloses a non-distortion repairing method for micro-damage of casting alloy part. In the method, a revolving solid anode bar made from CoCrW alloy is clamped on a rotary collet of an electric discharge machine, and spare parts to be repaired are connected with the cathode of the electric discharge machine; the power of the electric discharge machine is adjusted between 1000W and 1800W, and the frequency is adjusted into low frequency; shield argon is adjusted between 8L / min and 35L / min, and argon in an argon bottle is guided to a coating part by a copper pipe; a dipped finish of the copper pipe aims damage parts of the spare parts; after the power is turned on, the rotary cathode bar and the damage surfaces of the spare parts are contacted with degrees between 55 degrees and 75 degrees, and reciprocating coating is carried out at repairing parts. The method uses the characters of high transient temperature and short endurance time of electric spark micro-arc aggradation to reduce heat input in the repairing of spare parts, thereby avoiding the defects of great heat input amount of argon-arc welding, long acting time, much deformation of spare parts and easy generation of cracks in the prior art. The method overcomes the problems of border effect of plasma spraying, great investment cost of devices, low bonding strength of coating, easy plunger separation and chip off-falling for hot spraying in the prior art.

Description

technical field [0001] The invention relates to a method for repairing micro-damages of cast alloy parts without deformation, in particular to a method for repairing micro-abrasion, micro-mechanical damage, casting holes and micro-cracks of aero-engine high-temperature cast alloys and cast aluminum alloy parts. Background technique [0002] Due to vibration, stress and other factors during the use of the aero-engine, fretting wear and cracks will occur on the high-temperature alloy, cast superalloy, cast aluminum alloy and titanium alloy parts on the engine. Misassembly causes scratches and bruises on the surface of parts, and defects such as air holes and pinholes on the surface of parts left during manufacturing. At present, the repair methods for high-temperature deformed alloys, deformed aluminum alloys, titanium alloys and other parts with the above-mentioned defects usually include: [0003] Argon arc welding repair, the disadvantage of argon arc welding repair is lar...

AI Technical Summary

Problems solved by technology

[0006] The task of the present invention is to propose a method with low equipment investment cost, low requirements for operation skills, short repair period, high repair quality, and capable of repairing micro-damages of cast alloy parts without deformation, so as to solve the problem of aeroengine casting superalloys and cast aluminum alloys. The repair problem of minor damage failure of parts and components