Rebound control method of engine hood outer plate, flanging die and vehicle

Abstract

The invention relates to the technical field of vehicle body forming, in particular to a springback control method of an aluminum engine hood outer plate, a flanging die and a vehicle. The method comprises the steps that a flanging male die and an upper material pressing plate are used for pressing the area, except the flanging area, of the engine hood outer plate; the flanging area on the engine hood outer plate is pressed tightly through a flanging female die and a full-circumference pressing plate, so that the flanging process of the flanging area of the engine hood outer plate is completed in the clamped state, and huge springback caused by transverse shear stress released by free flanging of an arc area is avoided. According to the scheme, the curvature radius is adjusted, the auxiliary ridges are arranged, and the height and range of the main ridges are increased; the springback amount is reduced to be within a manufacturing end risk controllable range, and the problem of waves near main ridges can be eliminated. The problem of huge springback generated in the industrialization stage of the aluminum engine hood can be solved, the assembly precision of the engine hood can be improved, the assembly gap is reduced, and the appearance quality of the whole vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle body forming, in particular to a rebound control method of an outer panel of an engine hood, a flanging mold and a vehicle. Background technique [0002] The hood outer panel is one of the main parts of the front part of the passenger car; it is also an important medium-to-long-cycle cover (especially the aluminum alloy hood outer panel) because of its strong related properties such as styling and pedestrian protection. end-of-life long-cycle parts), which are the focus of the CAS review and synchronous engineering work in the early stage of vehicle development. [0003] But the stamping SE analysis at the CAS stage: there is a huge springback of the hood outer plate, such as figure 2 As shown; the maximum rebound of the rear is 27mm, the maximum rebound of both ends is -28mm, and the height difference reaches 55mm, which is related to the material properties of the aluminum plate. [0004] The ...

AI Technical Summary

Problems solved by technology

Since the elastic modulus of the aluminum sheet is 1 / 3 of that of the steel sheet, if the above-mentioned springback problem is solved by springback compensation, because the local compensation amount is large, and the compensation direction at the two ends is opposite to that in the middle, the curvature of the processed die surface is different from that of the product. Larger changes, because the curvature of the hood outer panel is the main factor affecting the amount of springback, each time the compensated parts will produce new and different springback results, which is also the difficulty of rectifying the springback problem of the aluminum hood outer panel where the

In the actual debugging process, the above-mentioned springback amount randomly changes, and the parts that have been debugged with multiple springback compensation still cannot meet the acceptance criteria

After the outer panel of the hood is press-fitted to the inner panel to form an assembly, the problem of the out-of-tolerance of the outer panel of the hood has been improved, and it can be loaded into the car, but the gap between the inner and outer panels is uneven, which affects the application of shock-absorbing glue on the inner and outer panels, and causes glue overflow, etc. Quality issues

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