Process method for remanufacturing shell hole rolling groove through laser direct deposition

Abstract

The invention relates to a process method for remanufacturing a shell hole rolling groove through laser direct deposition, and belongs to the technical field of laser processing. The method is mainly used for shell parts with bearing holes and the material strength of 160-1275 MPa, powder which is high in deposition formability, excellent in ductility and close to base metal components is selected as a deposition material, reasonable laser direct deposition process parameters are adopted, and material remanufacturing is conducted on the edges of the shell holes. After deposition, a base material and a remanufactured layer have no crack defect, the marginal margin of a remanufactured hole is sufficient, and the edge of the bearing can be effectively fixed after rolling and closing. When the rolling groove for remanufacturing the shell bearing hole is adopted, shell parts with bearings can be repeatedly assembled when special equipment such as airplanes and ships is overhauled, and reasonable fixation is guaranteed.

Description

technical field [0001] The invention relates to a process method for direct laser deposition to remanufacture rolling grooves of housing holes, which belongs to the technical field of laser processing and is mainly aimed at the bearing holes of housing parts with bearing holes with a material strength of 160-1275MPa Edge remanufacturing. Background technique [0002] For housing parts with bearing holes, the bearing sleeves are usually disassembled for bearing replacement or repair during maintenance, but some bearing sleeves are in housing parts with holes, and the edges of the housing holes are rolled in the form of notches The bearing is fixed, so the original rolling fixed edge is often destroyed during disassembly, so that the bearing sleeve can be taken out smoothly. As a result, when the subsequent bearing sleeves are repeatedly installed in the shell parts, the bearing sleeves need to be repositioned by rolling notches. However, the edge material of the bearing hole...

AI Technical Summary

Problems solved by technology

[0002] For housing parts with bearing holes, the bearing sleeves are usually disassembled for bearing replacement or repair during maintenance, but some bearing sleeves are in housing parts with holes, and the edges of the housing holes are rolled in the form of notches The bearing is fixed, so the original rolling fixed edge is often destroyed during disassembly, so that the bearing sleeve can be taken out smoothly

As a result, when the subsequent bearing sleeves are repeatedly installed in the shell parts, the bearing sleeves need to be repositioned by rolling notches. However, the edge material of the bearing holes will become thinner after rolling and the original fixed port material has been destroyed and removed, resulting in The bearing hole lacks the allowance for machining the rolling groove, and the assembly and fixing of the bearing sleeve cannot be realized again

For such defects, manual arc surfacing is used to supplement the local machining allowance. However, due to the repair of local positions by arc surfacing, it is difficult to guarantee the metallurgical quality of the base metal and weld after welding, and defects such as cracks often occur. At the same time, the high heat input during the surfacing process may cause certain deformation to the housing hole, resulting in difficulty in the assembly of the bearing and the housing