Method and system for manufacturing aluminum alloy part

Abstract

The invention provides a method for manufacturing an aluminum alloy part. When an aluminum alloy part is manufactured by subjecting a heat-treated aluminum alloy extruded material to plastic working,the method prevents the occurrence of cracks during plastic working at a lower cost than methods involving solution treatment or retrogression treatment. A manufacturing apparatus includes an extruderdevice (11) that performs hot extrusion processing on a heat-treated aluminum alloy; a cutting device (13) that is disposed on the output side of the extruder device (11), cuts the extruded material(17) to a predetermined length, and cuts the extruded material away from the extruder device (11); and a conveyance device (14) and a plastic working device (15) which are provided in the extruder device (11). The conveyance device (14) conveys the extruded material (17a) cut into a predetermined length by the cutting device (13) to the plastic working device (15), and the plastic working device (15) performs plastic working on the extruded material (17a) conveyed by the conveyance device (14) to form an aluminum alloy part.

Description

technical field [0001] The present invention relates to a method for manufacturing parts made of aluminum alloy by performing plastic working on a heat-treated aluminum alloy extruded material, and a manufacturing facility suitable for carrying out the method. Background technique [0002] In recent years, along with the strengthening of standards related to automobile collision safety and pedestrian protection, higher strength of automobile parts such as collision protection members (bumper reinforcements, etc.) and vehicle body frames has been demanded. On the other hand, reduction in weight of automobile parts is required in order to improve sporty performance and fuel efficiency. Therefore, as raw materials for these auto parts, heat-treated aluminum alloy extruded materials are used for the purpose of achieving both high strength and light weight. From the viewpoint of ensuring design freedom and reducing the number of parts, bending and In the case of plastic working ...

AI Technical Summary

Problems solved by technology

Therefore, when plastic processing such as bending, crushing, shearing (punching, etc.), burring, swaging, and other pressure forming is performed on an extruded material, there is a problem that the elongation of the material decreases due to natural aging. , the extruded material breaks and cracks after performing plastic working with large deformations

In addition, there are problems such as variations in springback due to incremental differences in material yield strength due to differences in the progress of natural aging, and deterioration of dimensional accuracy.

However, for example, in the case of an extruded material having a hollow cross section and one or more inner ribs inside, the temperature of the inner ribs that are not directly cooled from the outer periphery decreases slowly and quenching is insufficient, and artificial aging treatment results in The problem of less than the specified strength

In addition, there is also a problem that the deformation of the extruded material after cooling is increased due to the difference in heat shrinkage caused by the uneven temperature distribution of the cross section during cooling.

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