Method for repairing main bearing hole of body

Abstract

The invention relates to the technical field of maintenance of bearing holes and in particular relates to a method for repairing a main bearing hole of a body. The main bearing hole refers to the design, assembly and processing reference of the body, the central position is not allowed to deflect, the pore diameter is not allowed to be enlarged, and a brushing electroplating process cannot be used due to the reasons that the coating is small and easy to strip and cannot be machined and the like. However, thermal deformation of a welding part is increased by a common surfacing method, and the generated welding stress cannot be effectively eliminated; and meanwhile, the crack influence is large, the welding period is long, and the repair welding success rate is low. Aiming at the problems, a repair method for performing main bearing hole laser cladding surfacing and restoring the original precision of a drawing by virtue of machining is adopted, the repair processes of the main bearing hole of the body include four parts, namely cladding surfacing, surfacing part cover replacement and machining, detection of the repaired body and body cleaning and rust removal, wherein laser cladding surfacing is the key point of the whole repair process, and global surfacing and local surfacing of the pore diameter can be adopted aiming at the defect size and severity. The invention discloses an improved method for repairing the main bearing hole of the body.

Description

technical field [0001] The invention relates to the technical field of bearing hole maintenance, in particular to a method for repairing a main bearing hole of a machine body. Background technique [0002] The body is an important and key basic part of the diesel engine, and the blank material is integral cast ductile iron, which requires high precision. Take the body of GEVO16 diesel engine as an example: the main bearing hole diameter is ￠265 (+0.032 / 0) mm; the cylindricity is 0.025 mm; the straightness of adjacent holes is 0.03 mm; the straightness of the whole length is 0.10 mm. During the operation of the diesel engine, the main bearing seat of the diesel engine is severely strained and bruised due to tile rolling, and the main bearing seat hole of the body is seriously damaged or deformed due to reasons such as ridges during machining, resulting in the main bearing hole diameter and cylindricity of the body. The coaxiality with each hole is out of tolerance and cannot...

AI Technical Summary

Problems solved by technology

During the operation of the diesel engine, the main bearing seat of the diesel engine is severely strained and bruised due to tile rolling, and the main bearing seat hole of the body is seriously damaged or deformed due to reasons such as ridges during machining, resulting in the main bearing hole diameter and cylindricity of the body. The coaxiality with each hole is out of tolerance and cannot be used

The main bearing hole is the design, assembly and processing benchmark of the machine body. Its center position is not allowed to shift, and the hole diameter is not allowed to expand. The brush plating repair process cannot be used due to the reasons such as small coating, easy peeling and inability to machine. The surfacing welding method will increase the thermal deformation of the welding part, resulting in welding stress that cannot be effectively eliminated; at the same time, the cracks have a greater impact, and the welding repair cycle is long, and the success rate of welding repair is low