Research On Repaired 45 Steel Steeped Shaft Parts Based On Laser Cladding Technology

The meaning of laser cladding technology is to coat selected cladding materials on the surface of the substrate in different powder feeding methods which using laser device to emit lasers to melt the irradiated cladding materials and the substrate.Making the two substances fuse into single item and form a good metallurgical combination.To repeat the above process,eventually forming a complete part.Shaft parts are an indispensable part of mechanical transmission,so it has the practical significance to repair and remanufacture shaft parts.In this paper,45 steel shaft parts are chosen as the research object.Fe105 powder and Ni60 powder are selected as cladding materials in the initial stage.After comparing the performance of the two powders,Fe105 is chosen as cladding material.Two repaired methods are used to repair the shaft parts.The main work contents are as follows:(1)Single factor experiments are carried out on two kinds of alloy powders,and considering the effects of laser power,scanning speed and powder feeding rate on the width,penetration and melting height of Fe105 and Ni60 alloy powders.Three parameters of two kinds of powders under different technological parameters will be selected respectively.According to the data of orthogonal experiment to calculate the extreme difference value,obtaining the order of laser process parameters affecting the shape coefficient and dilution rate.Through the comprehensive analysis of the shape coefficient and dilution rate of the cladding layer,considering the influence of the selected process parameters on the laser utilization ratio,the optimum process parameters are selected for Fe105 alloy powder and Ni60 alloy powder respectively.(2)Through cladding iron-based powder and nickel-based powder on the surface of the matrix,the properties of the cladding layers of the two powders(microstructure,microhardness,friction and wear tests)are tested.It is concluded that the best powder is selected as the cladding material.(3)Comparing and analyzing the lapping rate test results and the cladding morphology,we will choose the optimal lapping rate and lapping track.The cladding layers have good overlapping effect and surface smoothness,moreover,it has no phenomenon of large cracks and pores.According to the width and height of cladding layer,we need to calculate the theoretical Z-axis lifting quantity firstly,and then the range of Z-axis lifting quantity is selected.After that analyzing the total height,morphology and microstructure of multi-channel and multi-layer cladding layer under various parameters.Finally,we will get the best lifting quantity.(4)Repairing and remanufacturing axle parts,choosing two kinds of repaired methods to repair shaft parts which include that processing the repaired part of shaft parts into ring grooves and repairing the worn surface of axle parts by milling machine into a plane.After that,testing the performance of repaired axle parts,and grinding and polishing the repaired axle parts,etc.