A method to reduce the number of processes for the inner panel of German-style rear doors while ensuring the quality of the pressed edges.

Abstract

This invention belongs to the field of automotive tailgate inner panel pressing technology, specifically involving a method to reduce the number of processes in German-style tailgate inner panels while ensuring the quality of the pressed edges. Based on the three-movement overhead shell structure of upper and lower pressing rings, the pressing edge of the product in the drawing process is designated as the modification area. The location of the inner panel aligned with the end of the outer panel pressing edge in the modification area is taken as the starting point. This starting point is 2mm along the inner panel direction as the starting position for the inner panel to be modified and shaped. The flange of the pressing area is modified according to the straight trimming edge. This solves the cracking problem in the drawing process and can also greatly reduce the amount of shaping in the shaping process, avoiding the problem of springback of the part due to excessive shaping.

Description

Technical Field

[0001] This invention belongs to the field of automotive tailgate inner panel pressing technology, specifically relating to a method for reducing the number of processes in German-style tailgate inner panels while ensuring the quality of the pressed edges. Background Technology

[0002] German-style rear door inner panels typically employ a three-moving, tilting shell design with upper and lower pressure rings due to the perforation within the window. The problem with this design is that the flange edge, pressed against the outer panel, requires trimming in this stamping direction. Limited by the strength of the trimming mechanism and the trimming angle, at least three trimming processes are needed. Adding the three processes of drawing, shaping, and fine punching, at least six mold processes are required, increasing tooling costs. To save on tooling costs, the flange edge needs to be modified to allow trimming in the stamping direction, reducing one trimming process. Then, a subsequent shaping mold can shape the flange edge into position. However, the dimensional accuracy of the product produced by this shaping process is not as high as that achieved through drawing. Furthermore, because the shaping boundary occurs at the product's farrowtic radius, if the radius is small, hardening is severe, making accurate dimensional accuracy difficult and requiring significant adjustments. Therefore, while reducing tooling costs, this approach compromises the quality of the pressing process.

[0003] In summary, when the German-style back door inner panel mold adopts the traditional three-movement tilting shell design with upper and lower pressure rings, and the product pressing edge is modified to be straightened in the stamping direction in order to reduce the number of processes, the flange modification requires a larger amount of shaping when the product flange is particularly long, and the springback value will also increase accordingly.

[0004] When the forming boundary line is placed at the product's rounded corner, the traditional method of modifying the pressing edge is to modify it at the product's rounded corner. Since the product's rounded corner is generally very small, it is easy to cause sidewall cracking during drawing. During the drawing design, the product's rounded corner is enlarged (the radius is enlarged to at least 10mm) to make it over-drawn. In this case, the forming springback is large, and it is difficult to guarantee the part size. Summary of the Invention

[0005] To overcome the above problems, the present invention provides a method to reduce the number of processes in the inner panel of the German-style rear door while ensuring the quality of the pressed edge. This method involves modifying the flange of the pressed edge of the inner panel of the rear door to extend 2mm beyond the pressed edge, and modifying the radius of the rounded corner to be more than 10mm. This can solve the cracking problem in the drawing process, and at the same time, it can greatly reduce the amount of forming in the shaping process and avoid the problem of springback of the part due to excessive forming.

[0006] A method for reducing the number of processes for the inner panel of German-style rear doors while ensuring the quality of the pressed edges includes the following:

[0007] Step 1: Select the area to be renovated

[0008] Based on the three-movement overhead shell structure of the upper and lower pressure rings, the pressing edge of the product in the drawing process is taken as the modification area.

[0009] Step 2: Take the location of the inner panel that is aligned with the edge of the outer panel in the modification area as the starting point. Take 2mm along the direction of the inner panel as the starting position for the inner panel to be modified and shaped. Modify the flange of the pressing area according to the straight trimming edge.

[0010] In step one, the area to be modified is placed on both sides of the rear window at the pressing edge, where repairs are needed.

[0011] The specific modification and shaping in step two involves shaping the inner plate to be modified and shaped in the pressing area from the starting position to the outside and downward.

[0012] The bending start position of the inner plate is 2mm away from the upper edge of the inner plate.

[0013] The radius of the rounded corner at the bend of the inner plate is adjusted according to the drawing formability.

[0014] The beneficial effects of this invention are:

[0015] The present invention modifies the area of ​​the pressed edge farad to a straight edge only at the rear windshield, and the traces of the modification can be covered and concealed by the glass.

[0016] The present invention designs the modification area 2mm outside the pressing edge, which can ensure that there is no pressing problem in the pressing area.

[0017] This invention can ensure that the size of the rounded corners of the drawn shape can be adjusted according to the formability of the drawn shape, reduce the risk of drawing breakage, and the forming marks can also be covered by glass, so as not to affect subsequent forming.

[0018] The post-forming amount of this invention is the minimum forming amount made based on the product pressing length, which is much smaller than that of traditional methods. This greatly reduces the amount of springback and ensures dimensional accuracy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the three-moving overhead shell structure of the upper and lower pressure rings of the present invention.

[0021] Figure 2 This is a schematic diagram of the modified area of ​​the present invention.

[0022] Figure 3 This is a schematic diagram of the modification and shaping of the present invention.

[0023] Figure 4 This is a schematic diagram comparing the present invention with traditional shaping processes. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] Example 1

[0029] A method for reducing the number of processes for the inner panel of German-style rear doors while ensuring the quality of the pressed edges includes the following:

[0030] Step 1: Select the area to be renovated

[0031] Based on the three-movement overhead shell structure of the upper and lower pressure rings, the pressing edge of the product in the drawing process is taken as the modification area.

[0032] Step 2: Take the location of the inner panel that is aligned with the edge of the outer panel in the modification area as the starting point. Take 2mm along the direction of the inner panel as the starting position for the inner panel to be modified and shaped. Modify the flange of the pressing area according to the straight trimming edge.

[0033] like Figure 2 As shown, in step one, the modification area is placed at the location on both sides of the rear window that needs to be repaired after the pressing edge.

[0034] like Figure 3 As shown, the modification and shaping in step two specifically involves shaping the inner plate to be modified and shaped in the pressing area from the starting position to the outside and downward.

[0035] The bending start position of the inner plate is 2mm away from the upper edge of the inner plate.

[0036] The radius of the rounded corner at the bend of the inner plate is adjusted according to the drawing formability.

[0037] Example 2

[0038] Combination Figure 1 This invention is based on a three-moving overhead shell structure with upper and lower pressure rings, and modifies the pressing edge of the product during the drawing process, such as... Figure 2 As shown, the modification area is only placed on the sides of the rear windshield where the repair is needed. Other areas are repaired according to the product design after the extension is completed. This avoids overlapping repairs and the problem of having to use a six-stage mold for three-stage trimming. At the same time, this area will be painted after pressing, which can perfectly cover up the shaping marks.

[0039] The modification method of the present invention is to modify the outer plate pressing area by 2mm, modify the flange of the pressing area according to the straight trimming, and adjust the radius of the rounded corner of the modified area according to the drawing formability.

[0040] like Figure 4 As shown, the subsequent shaping amount of the present invention is the minimum shaping made according to the product pressing length, which is much smaller than that of the traditional method. This greatly reduces the amount of springback and ensures the accuracy of dimensions.

[0041] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any person skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention. These simple modifications are all within the scope of protection of the present invention.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0043] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for reducing the number of processes for the inner panel of a German-style rear door while ensuring the quality of the pressed edges, characterized in that, Includes the following: Step 1: Select the area to be renovated Based on the three-movement overhead shell structure of the upper and lower pressure rings, the pressing edge of the product in the drawing process is taken as the modification area. Step 2: Take the location of the inner panel that is aligned with the edge of the outer panel in the modification area as the starting point. Take 2mm along the direction of the inner panel as the starting position for the inner panel to be modified and shaped. Modify the flange in the pressing area according to the straight trimming edge. In step one, the area to be modified is placed on both sides of the rear window where it needs to be repaired after the pressing edge is located. The specific modification and shaping in step two involves shaping the inner plate to be modified and shaped in the pressing area from the starting position to the outside and downward.

2. The method for reducing the number of processes for the inner panel of a German-style rear door while ensuring the quality of the pressed edges, as described in claim 1, is characterized in that... The bending start position of the inner plate is 2mm away from the upper edge of the inner plate.

3. The method for reducing the number of processes for the inner panel of a German-style back door while ensuring the quality of the pressed edges, as described in claim 2, is characterized in that... The radius of the rounded corner at the bend of the inner plate is adjusted according to the drawing formability.

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