Production method for L-shaped unequal-wall-thickness profile

Abstract

The invention discloses a production method for an L-shaped unequal-wall-thickness profile, and belongs to the technical field of metal machining. The production method mainly includes the steps of firstly, using a cast ingot as an original blank; secondly, sending the cast ingot into the extrusion forming procedure to be extruded into the L-shaped unequal-wall-thickness profile, and conducting shearing to obtain a finished L-shaped extrusion part; thirdly, sending the finished L-shaped extrusion part into a cooling device to be cooled; fourthly, sending the cooled finished L-shaped extrusion part into the roll-in shape correcting procedure, and obtaining a final product through shape correction and conducting the postprocessing procedure. By means of the method, wavy, bent and twisted deformation and other defects of the L-shaped unequal-wall-thickness profile can be eliminated, the size accuracy and the use performance of the profile are improved, the production efficiency of extrusion is improved, the mold service life is prolonged, the production period is shortened, the long ruler production process, including long ruler extruding, long ruler cooling and long ruler shape correcting, of the L-shaped unequal-wall-thickness profile is achieved, and remarkable economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to aluminum alloy extrusion production, in particular to a production method of L-shaped profiles with unequal wall thickness. Background technique [0002] At present, L-shaped aluminum alloy profiles are usually produced by die extrusion, which is acceptable for the production of L-shaped aluminum alloy profiles with equal wall thickness, but for L-shaped aluminum alloy profiles with unequal wall thickness, especially the extruded The cast ingot is made of hard aluminum alloy of 5A05 material. The L-shaped profile with unequal wall thickness produced by the existing extrusion die will cause twisting, In the case of bending and corner deformation, and the flow velocity inside and outside the thin-walled end of the profile is inconsistent, there will be out-of-tolerance deformation in the gap (such as figure 1 shown). However, for the twisting deformation that...

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Problems solved by technology

[0002] At present, L-shaped aluminum alloy profiles are usually produced by die extrusion, which is acceptable for the production of L-shaped aluminum alloy profiles with equal wall thickness, but for L-shaped aluminum alloy profiles with unequal wall thickness, especially the extruded The cast ingot is made of hard aluminum alloy of 5A05 material. The L-shaped profile with unequal wall thickness produced by the existing extrusion die will cause twisting, In the case of bending and corner deformation, and the flow velocity inside and outside the thin-walled end of the profile is inconsistent, there will be out-of-tolerance deformation in the gap (such as figure 1 shown)

However, for the twisting deformation that occurs, if it is stretched and corrected (the stretching deformation is controlled at 0%-0.5%, not too large), the twisting deformation will be basically eliminated. However, when it is tested on the platform, its The amount of deformation will become larger if the gap is out of tolerance

Therefore, the traditional production method restricts the production of L-shaped profiles with unequal wall thickness, which has the disadvantage of poor stability, which in turn affects the production rhythm of subsequent cooling, orthopedic and other finishing processes, and the production efficiency is low. For large-scale production of profiles, it is necessary to design a method that can eliminate defects such as profile waves, bending, and twisting deformation, so as to ensure that the profile dimensions are qualified and at the same time realize the long-length production process of profiles

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