Method for reducing depth of coarse grain layer of surface of aluminum alloy hot forging part

Abstract

The invention relates to the technical field of metal forging, in particular to a method for reducing the depth of a coarse grain layer of the surface of an aluminum alloy hot forging part. The methodcomprises the following steps that (S1) the aluminum alloy hot forging finished product is cooled to room temperature; (S2) sampling detecting of the depth of the coarse grain layer is carried out; (S3) if the measured depth of the coarse grain layer exceeds an acceptable depth, local cold plastic deformation is carried out; (S4) cold finishing is carried out; (S5) recrystallization annealing iscarried out; and (S6) sampling detecting of the depth of the processed coarse grain layer is carried out. The method for reducing the depth of the coarse grain layer of the surface of the aluminum alloy hot forging part has the beneficial effects that the local cold plastic deformation and cold finishing processes of surface metal are increased after a conventional aluminum alloy hot forging process, the cold plastic deformation enables the coarse grain layer to obtain sufficient deformation amount, and grain refinement of the coarse grain layer is achieved through the recrystallization annealing, so that the effect of reducing the depth of the coarse grain layer of the aluminum alloy hot forging part can be achieved without removing materials; and waste of the materials and scrap of forging parts caused by coarse grain defects are reduced, the qualification rate of the aluminum alloy hot forging part is improved, and the dimensional accuracy of the forging part is further increased through the cold finishing process.

Description

technical field [0001] The invention relates to the technical field of metal forging and forming, in particular to a method for reducing the depth of a coarse-grained layer of a surface layer of an aluminum alloy hot forging piece. Background technique [0002] Due to a series of advantages such as small specific gravity, specific strength, and high specific stiffness, aluminum alloys have more and more applications, huge market potential and good application prospects. They have been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries. Application is one of the key new materials developed in the "Twelfth Five-Year Plan" of new materials. And forgings play an important role in the application of aluminum alloys due to their excellent properties. Forging aluminum alloy can not only obtain the shape of mechanical parts, but also improve the internal structure of the material and improve the mechanical properties. Gene...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: Aiming at the problem that a coarse-grained layer appears on the important surface of some aluminum alloy forgings, and the depth of the coarse-grained layer cannot be eliminated by subsequent material removal, the present invention proposes a method for reducing the surface thickness of aluminum alloy hot forgings. The method for the depth of the coarse grain layer, through the following process steps: (S1) cooling the finished aluminum alloy hot forging to room temperature, (S2) sampling the depth of the coarse grain layer, (S3) if the measured depth of the coarse grain layer exceeds the acceptable depth, carry out local Cold plastic deformation, (S4) cold finishing, (S5) recrystallization annealing, (S6) sampling detection of the depth of the coarse grain layer of the product after recrystallization annealing, effectively solving the problem that some coarse grain defects cannot be eliminated by subsequent material removal , overcoming the need to remove material to achieve the effect of reducing the depth of the coarse grain layer on the surface of aluminum alloy hot forgings, wasting materials, and even leading to the scrapping of hot forgings, improving the pass rate of aluminum alloy hot forgings, and improving the cold finishing process The dimensional accuracy of the forging

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