Edge rolling process and device for aluminum alloy door cover with large opening angle

Abstract

The present invention discloses an edge rolling process and an edge rolling device for an aluminum alloy door cover with a large opening angle; the edge rolling process comprises the following steps of: Step 1, feeding: placing plates on a forming die, and positioning and pressing the plates downward by an upper edge rolling gripping tool which moves downwards; Step 2, edge pre-wrapping: operatingan edge wrapping mechanism located around the forming die to conduct edge pre-wrapping of a part with the large opening angle of an outer plate edge; after the opening angle of the outer plate edge is less than 90 degrees, controlling the edge wrapping mechanism to leave the outer plate edge so as to complete edge pre-wrapping; and Step 3, edge rolling: operating an edge rolling robot located around the forming die; and conducting edge rolling to an entire edge of the outer plate through an edge rolling tool on the edge rolling robot before completely wrapping an edge of an inner plate with the edge of the outer plate. The edge rolling device comprises the forming die, the edge rolling gripping tool, the edge wrapping mechanism and the edge rolling robot. Compared with a prior art, the device and the method in present invention have the following advantages that: the number of edge rolling times is reduced, edge rolling cracks are eliminated, and the edge rolling efficiency is improved.

Description

technical field [0001] The invention relates to a hemming process and a hemming device for an aluminum alloy door cover with a large opening angle. Background technique [0002] With the development of lightweight car bodies, more and more car door covers use aluminum alloy as the panel material, and the door cover is composed of an outer panel and an inner panel. However, due to the limitation of the material characteristics of the aluminum alloy plate, the hemming process of the door cover is also affected accordingly. Among them, the ductility of aluminum alloy is poorer than that of steel, and it is prone to crack defects in rolling edge fillets. This requires that the hemming angle should not be too large each time, about 30° to 40°. If the rolling edge angle is too large, it is also easy to produce flash. At the same time, repeated rolling will accumulate stress at the corners of the rolling edge, causing cracks. [0003] At present, in order to improve the flexibi...

AI Technical Summary

Problems solved by technology

[0004] However, due to the shape design of some door covers, the opening angle of the edge of the outer panel is relatively large. For example, when the opening angle exceeds 120°, if only the hemming robot is used for hemming, due to the limitation of the hemming angle of each step, 4~ 5 times

Due to the excessive number of hemmings, the accumulated stress of the rounded corners of the hemming and the limitation of the ductility of the aluminum parts are prone to cracks, which cannot be repaired and cause the product to be scrapped.

Moreover, multiple rolls will inevitably bring about an increase in the rolling time, and the final cycle time of the station will also increase.

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