Plasma arc cladding repairing method of coupling half inner bore

Abstract

The invention discloses a plasma arc cladding repairing method of a coupling half inner bore. The method comprises the following steps of: detecting a coupling half, removing a worn fatigue layer to expose a new processing surface, and performing flaw detection; preparing Ni55 and WC alloy powder according to a proportion by a mechanical powder mixer; pre-coating the mixed alloy powder on the surface of the coupling half inner bore; scanning the Ni55 and WC mixed alloy powder by a plasma arc, and cladding the surface of the coupling half inner bore with the powder; performing thermal treatment on the coupling half with the pre-coated cladding layer, and cooling slowly; performing machining and flaw detection on the cooled cladding layer on the surface of the coupling half inner bore to obtain a coupling half meeting the requirements for the size and the form and location tolerance; and finally finishing assembly. Compared with the prior art, the method disclosed by the invention has the advantages of strong technological adaptability, long service life, simple technology, strong controllability, low energy consumption and the like.

Description

technical field [0001] The invention relates to a method for repairing a mechanical transmission part, in particular to a method for repairing the inner hole of a half-coupling. Background technique [0002] The semi-coupling is an important mechanical transmission part widely used in the fields of ships, mines, machinery, metallurgy, etc. The performance and service life of the half-coupling directly affect the transmission performance and operating rate of the equipment. The working environment of the half-coupling is generally more complicated, and the transmission load is large. Due to the influence of metal fatigue and dust, impurities, corrosive media and other factors in the environment, the inner hole of the half-coupling is prone to wear and tear, which will cause imbalance during operation. Inertial force and moment of inertia lead to partial contact between the shaft teeth and the internal teeth, causing serious wear on the inner and outer tooth surfaces, and even...

AI Technical Summary

Problems solved by technology

The working environment of the half-coupling is generally more complicated, and the transmission load is large. Due to the influence of metal fatigue and dust, impurities, corrosive media and other factors in the environment, the inner hole of the half-coupling is prone to wear and tear, which will cause imbalance during operation. Inertial force and moment of inertia lead to partial contact between the shaft teeth and the internal teeth, causing severe wear on the inner and outer tooth surfaces, and even broken teeth and counterpart bolts may occur, thus affecting the safe operation and service life of the machine

Half couplings are often damaged and replaced, which affects continuous production, not only increases production costs, but also increases maintenance workload

[0003] Aiming at the problem of repairing the inner hole of the half-coupling after wear, the argon arc welding repair welding process is often used at present, but due to the large deformation and large residual stress of the inner hole after repair welding, and the inner hole of the half-coupling has strict size and shape Due to the requirement of bit tolerance, the yield rate of repairing the inner hole of the half-coupling by argon arc welding is very low, which cannot fully meet the production needs; another common repair process is to use the thermal spraying process to repair the inner hole of the half-coupling, but Due to the characteristics of the thermal spraying technology itself, the thickness of the thermal sprayed coating cannot meet the requirements for the inner hole with a wear amount of several millimeters, and because the coating is mechanically combined with the substrate, the coating on the surface of the inner hole is easy to fall off, and cannot well meet the technological requirements for repairing the inner hole of the half-coupling

The above repair process does not have good adaptability, and production practice urgently needs a repair process for the inner hole of the semi-coupling with strong adaptability, easy operation, and low cost, which can improve the service life of the half-coupling after repair and ensure the safety of the equipment. Continuous operation for a long time