Production and Preparation Technology of Extruded Profiles with Wide Thin Wall Ribbed Panel for Rail Transit
By adjusting the die structure and extrusion process of 6005A-T6 aluminium alloy wide thin-wall ribbed panel profiles,the forming behavior of the profile was improved,and the dimensional accuracy of the profile was guaranteed without applying the roll finishing process,which reduced the difficulty of the preparation process of the product.The experimental results show that the pre-deformation design of the wide thin-wall ribbed panel profile mold structure can effectively compensate the plane gap and other shape and position dimensions of the product after stretching,which ensures the high dimensional accuracy of the profile.By adopting the combined quenching cooling method of"weak air cooling+medium strength air cooling",the cooling rate of the key quenching in-terval of the profiles is reduced from 5.5℃/s to 2.7℃/s,which can effectively reduce the thermal stress deformation of the profiles af-ter quenching,and reduce the difficulty of implementing the subsequent tensile straightening process.In addition,the yield strength of the profile at T6 temper is reduced from 266 MPa to 245 MPa,the tensile strength is reduced from 299 MPa to 282 MPa,and the elongation is increased from 12%to 14%.The geometrical size,mechanical properties,surface quality and other comprehensive proper-ties of the product meet the requirements of users,and the process scheme can provide a reference for the development of similar struc-tural profiles.
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