| Aluminum alloy wheel hub has the advantages of beautiful appearance,strong corrosion resistance,good processability,light weight,high specific strength,good heat dissipation,energy saving,etc.,which can meet the basic requirements of automobile lightweight,and can replace steel plate as the first choice of automobile wheel hub material.The manufacturing process of aluminum alloy wheel hub is complex and the use environment is harsh,which makes it possible to have defects in the casting process,machining process and use process,so that the wheel hub can be scrapped.Therefore,how to achieve high-quality hub repair has been an urgent problem in the field of transportation.Laser additive manufacturing technology is an advanced repair technology,which has the advantages that other traditional repair methods can not overcome,and then realize the high-precision and high-quality repair of high accessory value and complex parts,so that the structural dimension and mechanical properties of the parts to be repaired can be restored to a certain extent,and the parts can be repaired with high efficiency,high precision and low cost.Based on this,this paper takes 2A14 aluminum alloy hub as the research object,uses alsi10 mg powder and laser additive manufacturing technology to repair its crack damage.First,according to the shape and stress analysis of the actual aluminum alloy automobile hub,the finite element model of the hub is established,and the finite element analysis is carried out.When the hub is loaded,the maximum stress of the aluminum alloy hub is 84.146 mpa,and the maximum stress point is on the side wall of the hub and the vent hole near the spoke,and the maximum strain position of the hub is also the maximum stress position.The location is consistent with the actual location of aluminum alloy hub cracking.Then,the 2A14 aluminum alloy material with the same aluminum alloy wheel hub was selected as the base material,and alsi10 mg powder was selected to carry out a single experiment on the 2A14 aluminum alloy base plate by using the laser additive manufacturing technology.The yield strength,tensile strength and elongation of the formed alsi10 mg aluminum alloy are 200 MPa,370 MPa and 6.4% respectively,which are similar to those of the as cast alloy.The tensile fracture of alsi10 mg shows a large number of small and shallow dimples,among which there are obviously short tearing edges and quasi cleavage surfaces.Finally,the 2A14 aluminum alloy wheel hub with cracks is taken as the research object,and the best combination of laser processing parameters obtained in Chapter 3 is used to repair the 2A14 aluminum alloy wheel hub.After processing,the surface of the repaired area is smooth,and there is no obvious crack,pore and other defects.After the dye penetrant test on the repaired area,it was found that 2A14 aluminum alloy hub had no cracks,which met the use requirements. |
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