A method of springback compensation for an automotive body outer panel

Abstract

This invention discloses a springback compensation method for automotive body exterior panels, comprising the following steps: S1, establishing springback compensation control points; S2, adjusting the springback value of the springback compensation control points until the springback difference between adjacent springback compensation control points is continuous; S3, using the adjusted springback value of the springback compensation control points to drive surface compensation, checking the change in surface length and surface quality after compensation. If both the change in surface length and surface quality are qualified, proceed to S4; otherwise, return to S2; S4, using the compensated surface to update the processing parameters of the automotive body exterior panel, performing simulation, and checking whether the springback result meets the product tolerance requirements. If it does not meet the requirements, readjust the springback value of the springback compensation control points, and repeat S3 and S4 until the springback result meets the product tolerance requirements. This method can ensure both the dimensional accuracy of the compensated automotive body exterior panel and the surface appearance quality of the compensated automotive body exterior panel, and effectively shorten the springback compensation cycle.

Description

Technical Field

[0001] This invention relates to the manufacturing and processing of automotive body exterior panels, and more specifically to a method for springback compensation of automotive body exterior panels. Background Technology

[0002] With the continuous shortening of automotive development cycles and the increasing demands for dimensional accuracy and appearance quality of body panel components, higher requirements are being placed on the design and manufacturing cycle and quality of body panel component molds. Among these, springback of stamped parts is a major factor affecting the mold design and manufacturing cycle and the quality of stamped parts. Currently, springback compensation heavily relies on CAE software for automatic compensation of the output surface, but the quality of the output surface is too poor. This necessitates professional modelers to reconstruct the A-surface of the output surface, resulting in a large workload, long springback compensation cycles, and impacting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a springback compensation method for automotive body exterior panels, which can ensure both the dimensional accuracy of the compensated exterior panels and the surface appearance quality of the compensated exterior panels, and can effectively shorten the springback compensation cycle.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for springback compensation of automotive body exterior panels includes the following steps:

[0006] S1. Based on the shape characteristics and rebound trend of the vehicle body outer covering, establish rebound compensation control points on both sides of the feature line of the vehicle body outer covering and / or in the transition area between rebound burst and rebound collapse.

[0007] S2, In the simulation analysis software, check the rebound amount of the rebound compensation control point, and adjust the rebound amount value of the rebound compensation control point until the difference in rebound amount between adjacent rebound compensation control points is continuous.

[0008] S3, use the adjusted rebound value of the rebound compensation control point to drive the surface compensation, check the change in surface line length and surface quality after compensation. If the change in line length and surface quality are both qualified, proceed to S4; otherwise, return to S2 and readjust the rebound value of the rebound compensation control point.

[0009] S4. Use the compensated surface to update the processing parameters of the body exterior panel, perform simulation, and check whether the springback result meets the product tolerance requirements. If it does not meet the requirements, adjust the springback value of the springback compensation control point again according to the simulation analysis results, and repeat S3 and S4 until the springback result meets the product tolerance requirements.

[0010] Furthermore, in S1, a three-dimensional model of the vehicle body exterior panel is first established in the three-dimensional modeling software. Then, based on the shape characteristics and rebound trend of the vehicle body exterior panel, rebound compensation control points are established on both sides of the feature line of the three-dimensional model of the vehicle body exterior panel and / or in the transition area between rebound burst and rebound collapse.

[0011] Furthermore, the 3D modeling software is CATIA.

[0012] Furthermore, S2 specifically involves: exporting the rebound compensation control points from the 3D modeling software as igs format files, then importing the igs format files into the simulation analysis software to view the rebound amount of the rebound compensation control points; then inputting the rebound amount of the rebound compensation control points into Excel and calculating the difference in rebound amount between adjacent rebound compensation control points; finally, adjusting the rebound amount values ​​of the rebound compensation control points until the difference in rebound amount between adjacent rebound compensation control points is continuous.

[0013] Furthermore, the simulation analysis software is AutoForm.

[0014] Furthermore, in S3, if the difference in line length between the compensated surface and the original surface is within ±0.3mm, the line length change is deemed acceptable; otherwise, the line length change is deemed unacceptable.

[0015] Furthermore, the quality inspection of the surface products in S3 includes zebra stripe, curvature comb, Gaussian, and area diffraction inspection.

[0016] The beneficial effects of this invention are:

[0017] This invention first establishes springback compensation control points based on the shape characteristics and springback trend of the vehicle body outer panel. Then, it views the springback amount of the springback compensation control points in simulation analysis software and adjusts the springback amount values ​​of the springback compensation control points until the springback amount difference between adjacent springback compensation control points is continuous. The adjusted springback amount values ​​of the springback compensation control points are used to drive surface compensation to improve the surface quality after springback compensation. At the same time, it ensures the accuracy of mold surface compensation and the quality of the finished product after compensation, shortens the mold design and manufacturing cycle, and effectively supports the requirements for dimensional accuracy and appearance quality of vehicle body outer panels under short-cycle automotive development. Attached Figure Description

[0018] Figure 1 A schematic diagram of the product model for the front hood outer panel;

[0019] Figure 2 A cloud map showing the product's springback distribution on the outer front panel;

[0020] Figure 3 This is a schematic diagram of the springback compensation method for automotive body exterior panels as described in this invention.

[0021] Figure 4This is a schematic diagram showing the distribution of springback compensation control points on the outer panel of the front cover.

[0022] Figure 5 This is a comparison chart of the profile line lengths before and after profile compensation;

[0023] Figure 6 This is a comparison image of the zebra stripe pattern before and after surface compensation.

[0024] Figure 7 A comparison diagram of the curvature comb before and after surface compensation;

[0025] Figure 8 This is a comparison chart of Gaussian curves before and after surface compensation;

[0026] Figure 9 This is a comparison diagram of diffraction patterns before and after surface compensation.

[0027] Figure 10 This is a product springback distribution cloud map of the front cover outer panel after springback compensation. Detailed Implementation

[0028] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] Taking the front hood outer panel of a certain car model as an example, see Figure 1 The product model of the front hood outer panel is shown. The stamping process is designed for one piece per mold. To evaluate the dimensional accuracy of the product, a simulation of the stamping process was performed in AutoForm simulation analysis software, and the resulting springback distribution cloud map is shown below. Figure 2 As shown, the tolerance requirements for the outer front panel are: ±0.5mm for the perimeter mating surface and ±1mm for the central area. The springback results show that the springback value of the outer front panel exceeds the product tolerance range, requiring springback compensation of the surface profile. See [link / reference]. Figure 3 The springback compensation method for automotive body exterior panels shown includes the following steps:

[0031] S1. In the 3D modeling software CATIA, create a 3D model of the vehicle's outer body panel. Based on the shape characteristics and springback trend of the outer body panel, establish springback compensation control points on both sides of the feature lines of the outer body panel and / or in the transition area between springback burst and springback collapse. Specifically:

[0032] ①Analysis of product shape characteristics: The outer panel of the front cover is a symmetrical piece. From the center of symmetry outwards, there is a concave shape, and further outwards there is a raised feature line.

[0033] ②Analysis of rebound trend: The rebound is symmetrical from left to right, with the middle area and the fender matching area sagging down, and the headlight matching area and the windshield matching area exploding outward.

[0034] ③ Establish springback compensation control points: Arrange a row of control points at the center of symmetry, a row of control points on each side of the concave shape, a row of feature points on each side of the convex feature line, and a row of feature points at the matching position with the fender. Establish the springback compensation control point arrangement in CATIA as follows: Figure 4 As shown.

[0035] S2. In the simulation analysis software, check the rebound amount of the rebound compensation control point, and adjust the rebound amount value of the rebound compensation control point until the difference in rebound amount between adjacent rebound compensation control points is continuous. Specifically:

[0036] ① Export the springback compensation control points from CATIA in igs format.

[0037] ② Import the igs file into the simulation analysis software AutoForm.

[0038] ③ Check the amount of rebound at the rebound compensation control point.

[0039] ④ Input the rebound amount of the rebound compensation control point location into Excel, and calculate the difference in rebound amount between adjacent rebound compensation control points.

[0040] ⑤ Adjust the rebound compensation amount of the rebound compensation control point so that the difference in rebound amount between adjacent rebound compensation control points is continuous, and then use this value as the compensation amount of the rebound compensation control point.

[0041] S3, using the adjusted springback compensation control point's springback value to drive surface compensation, check the change in surface line length and surface quality after compensation, and compare the compensated surface line length with the original surface line length. Figure 5 As shown; a comparison of the zebra stripe pattern on the compensated surface and the original surface. Figure 6 As shown, the curvature comb of the compensated surface is compared with that of the original surface. Figure 7 As shown, the Gaussian comparison between the compensated surface and the original surface is as follows: Figure 8 As shown, the diffraction comparison between the compensated surface and the original surface region is as follows: Figure 9As shown, after comprehensively evaluating various indicators, both the change in surface length and the quality of the dough are qualified after compensation, and S4 is performed. It should be noted that if either the change in surface length or the quality of the dough is unqualified, the process returns to S2, and the rebound value of the rebound compensation control point is readjusted.

[0042] S4 uses the compensated surface to update the machining process parameters of the vehicle body exterior panels, and performs simulation. (See [link]). Figure 10 The image shows the springback distribution cloud map of the product after springback compensation. The springback results show that the product's springback value meets the product tolerance requirements. It should be noted that if the springback results do not meet the product tolerance requirements, the springback value of the springback compensation control point should be adjusted again based on the simulation analysis results, and S3 and S4 should be repeated until the springback results meet the product tolerance requirements.

[0043] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for springback compensation of automotive body exterior panels, characterized in that, Includes the following steps: S1. Based on the shape characteristics and rebound trend of the vehicle body outer covering, establish rebound compensation control points on both sides of the feature line of the vehicle body outer covering and / or in the transition area between rebound burst and rebound collapse. S2, In the simulation analysis software, check the rebound amount of the rebound compensation control point, and adjust the rebound amount value of the rebound compensation control point until the difference in rebound amount between adjacent rebound compensation control points is continuous. S3: Use the adjusted rebound value of the rebound compensation control point to drive the surface compensation, check the change in surface line length and surface quality after compensation. If the difference in surface line length between the compensated surface and the original surface is within ±0.3mm, the change in line length is deemed acceptable; otherwise, the change in line length is deemed unacceptable. If both the change in line length and surface quality are acceptable, proceed to S4; otherwise, return to S2 and readjust the rebound value of the rebound compensation control point. S4. Use the compensated surface to update the processing parameters of the body exterior panel, perform simulation, and check whether the springback result meets the product tolerance requirements. If it does not meet the requirements, adjust the springback value of the springback compensation control point again according to the simulation analysis results, and repeat S3 and S4 until the springback result meets the product tolerance requirements.

2. The springback compensation method for automotive body exterior panels according to claim 1, characterized in that: In S1, a three-dimensional model of the vehicle body exterior panel is first created in the three-dimensional modeling software. Then, based on the shape characteristics and rebound trend of the vehicle body exterior panel, rebound compensation control points are established on both sides of the feature line of the three-dimensional model of the vehicle body exterior panel and / or in the transition area between rebound burst and rebound collapse.

3. The springback compensation method for automotive body exterior panels according to claim 2, characterized in that: The 3D modeling software used is CATIA.

4. The springback compensation method for automotive body exterior panels according to claim 3, characterized in that, S2 specifically involves exporting the rebound compensation control points from the 3D modeling software as an igs format file, then importing the igs format file into the simulation analysis software to view the rebound amount of the rebound compensation control points. Next, input the rebound amount of the rebound compensation control point into Excel and calculate the difference in rebound amount between adjacent rebound compensation control points; finally, adjust the rebound amount value of the rebound compensation control point until the difference in rebound amount between adjacent rebound compensation control points is continuous.

5. The springback compensation method for automotive body exterior panels according to claim 1 or 2, characterized in that: The simulation analysis software is AutoForm.

6. The springback compensation method for automotive body exterior panels according to claim 1 or 2, characterized in that: S3 quality inspection of noodles includes zebra stripes, curvature combs, and area diffraction inspection.

Images