An integrated bead structure with small-radius corner stiffness enhancement

Abstract

The utility model provides a kind of integrated rib structure that outer covering piece small fillet rigidity is enhanced, it is related to automobile body manufacturing technical field, including stamping die, the outside of stamping die is equipped with press machine, the top of stamping die is equipped with pressure column, the center of stamping die is equipped with pressure ring, and stamping die includes upper die holder and lower die holder, the bottom of upper die holder is equipped with guide bushing, the top of lower die holder is equipped with guide column, the bottom center of upper die holder is equipped with pressure ring, the top of lower die holder is equipped with forming groove, one side of forming groove is equipped with fillet area, the inside of fillet area is equipped with rib groove, rib groove is used, the design of integrated rib has significantly improved the local bending stiffness and torsional stiffness of outer covering piece fillet area, effectively suppress the vibration and deformation of the area.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile body manufacturing, in particular to an integrated rib structure for enhancing the rigidity of small rounded corners of outer panels. Background Art

[0002] According to the design method for the die surface of the feature line region of an automobile outer panel disclosed in Chinese Patent Publication No. CN105268865B, the design method determines the machining fillet radius R_process of the punch and die according to the fillet radius R of the feature line of the automobile outer panel. When R ≤ 3mm, the machining fillet radius R_process of the punch and die is 0mm; when 3mm < R < 4mm, the machining fillet radius R_process of the punch and die is 1.5mm; when R ≥ 4mm, the machining fillet radius R_process of the punch and die is R-2mm. The design method for the die surface of the feature line region of the automobile outer panel provided by the invention can greatly reduce the intensity and difficulty of later fitter debugging and shorten the entire die manufacturing cycle while ensuring the dimensional accuracy of the feature line and the overall forming quality of the outer panel.

[0003] The above comparative document and the prior art have the following technical problems: the fillet regions on the body waistline, the intersection of feature lines of the existing automobile outer panel or the die fillet in the drawing forming process often have relatively weak structural rigidity while meeting the requirements of aesthetics and pedestrian protection, and are prone to deformation or vibration under the action of external force, which affects the body quality and safety. Contents of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and propose an integrated rib structure for enhancing the rigidity of small rounded corners of outer panels.

[0005] To achieve the above purpose, the utility model adopts the following technical solution: an integrated rib structure for enhancing the rigidity of small rounded corners of outer panels, comprising a stamping die, a press is arranged on the outer side of the stamping die, a pressing column is arranged on the top of the stamping die, and a blank holder is arranged at the center of the stamping die.

[0006] Preferably, the stamping die comprises an upper die base and a lower die base, a guide sleeve is arranged at the bottom of the upper die base, and a guide post is arranged at the top of the lower die base.

[0007] Preferably, a blank holder is arranged at the center of the bottom of the upper die base, and the blank holder is annular in shape.

[0008] Preferably, a forming groove is arranged at the top of the lower die base, and a fillet region is arranged on one side of the forming groove.

[0009] Preferably, a rib groove is arranged inside the fillet region.

[0010] Preferably, the rib groove extends along the curvature direction of the rounded corner region.

[0011] Preferably, the cross-sectional shape of the rib groove is U-shaped.

[0012] Beneficial effects In this invention, a rib groove is used. The rib is integrally formed by pressing the reverse groove into the back of the thin sheet blank, forming a U-shaped structure with a certain cross-sectional modulus. According to the principles of material mechanics, this raised rib structure can move the neutral axis away from the surface of the sheet, making it more resistant to bending and torsion, and enhancing the local moment of inertia. The rib structure greatly improves the bending and torsional stiffness of the rounded corner area of ​​the outer cover, effectively suppressing the local deformation and vibration of this area during driving caused by airflow, vibration or slight collision, thereby improving the quality of the vehicle body and the performance of noise, vibration and ride comfort.

[0013] In this invention, a rib groove is employed. The reverse groove of the rib applies a certain amount of friction and constraint to the flowing sheet metal in the early stage of stretching, changing the local stress-strain state. Especially in the rounded corner area, the forming process of the rib requires precise material flow. This constraint helps to prevent the material from being overstretched at the rounded corner and reaching the fracture limit. The formation of the rib can effectively consume some excess material and suppress local wrinkling. Through reasonable rib structure design, the material flow in the rounded corner area can be assisted in regulating, effectively alleviating stress concentration caused by small radius of curvature, and reducing the risk of fracture during the stretching process. This helps to successfully stretch and form the rounded corners of the automotive sheet metal parts described in the document.

[0014] This invention employs an integrated design, with the entire structure completed through a single stretching and stamping operation. It utilizes only the material of the thin sheet blank itself, optimizing the geometry of the ribs rather than adding extra thickness or parts to enhance rigidity. The entire process relies solely on a press and a set of high-precision molds, including the rib grooves. From blank preparation to part removal, everything is completed in one workstation, eliminating the need for subsequent structural connection work. The ribs and the body are integrally formed, avoiding the additional materials and connection processes required by traditional welding of reinforcing plates. This achieves a balance between increased structural strength and minimized part weight, aligning with the trend of automotive lightweighting. The integrated design eliminates the secondary assembly processes of welding reinforcing plates or gluing reinforcing blocks in traditional processes, significantly improving production efficiency, simplifying the production process, and reducing material and assembly costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structural position of this utility model; Figure 2 This is a perspective view of the present utility model; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a perspective view of the stamping die of this utility model; Figure 5 This is a perspective view of the lower mold base of this utility model; Figure 6 This utility model relates to a rib groove.

[0016] Legend: 1. Stamping die; 101. Upper die base; 102. Lower die base; 2. Press; 3. Pressing column; 4. Guide sleeve; 5. Guide column; 6. Pressing ring; 7. Forming groove; 8. Rounded corner area; 9. Rib groove. Detailed Implementation

[0017] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0018] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific Implementation Example 1: Reference Figure 1-6This utility model provides an integrated rib structure for enhancing the stiffness of small rounded corners in an outer covering, including a stamping die 1, a press 2 on the outer side of the stamping die 1, a pressure post 3 on the top of the stamping die 1, and a blank holder 6 at the center of the stamping die 1. The stamping die 1 includes an upper die base 101 and a lower die base 102. A guide sleeve 4 is provided at the bottom of the upper die base 101, and a guide post 5 is provided at the top of the lower die base 102. The blank holder 6 is located above the lower die base 102, surrounding the forming area, and its main function is to apply pressure. By applying precise blank holder force, it can control the sheet metal blank. The flow velocity and flow state from the flange area into the mold cavity are crucial for complex drawn parts containing ribs. The pressure of the blank holder 6 must be precisely calculated and adjusted to prevent tearing due to insufficient material flow in the rounded corner area 8, and to prevent wrinkling of the thin sheet in the flange or planar area. At the beginning of stamping, it cooperates with the upper die or punch to clamp the outer edge of the blank. The blank holder 6 controls the flow of the blank, preventing cracking caused by over-stretching. The blank holder 6 is annular in shape. The top of the lower die base 102 has a forming groove 7, and one side of the forming groove 7 has a small rounded corner area 8. The interior of the rounded corner area 8 has a rib groove 9. 9 extends along the curvature direction of the rounded corner area 8. The cross-sectional shape of the rib groove 9 is U-shaped. Under the action of the press 2, the raw material of the outer cover is pushed into the lower die base 102 by the upper die base 101. When the blank flows through the rounded corner area 8, it is forced into the rib groove 9 on the lower die base 102. The protrusion formed by the blank in the lower die base 102 is the integrated rib when viewed from the inside of the outer cover. The overall working process is as follows: the outer cover sheet blank that meets the requirements is placed on the lower die base 102 of the mold, and stamping lubricant is evenly applied. The slide of the press 2 moves downward, and the blank holder 6 first contacts the blank and applies a specific blank holder force. By controlling the flow rate of material into the stretching area, the upper die holder 101 continues to descend, pressing the blank into the forming groove 7 of the lower die holder 102. While stretching and forming the main curved surface of the outer cover, the blank is pressed into the reverse groove rib groove 9 reserved on the lower die on the back of the rounded corner area 8, thereby forming a reinforcing rib in one piece. The slide of the press 2 moves upward, and the demolding device pushes the formed part out of the mold, completing the manufacturing of the integrated rib structure with enhanced stiffness of the small rounded corner of the outer cover. By using one stretching forming, the complex curved surface and local reinforcing rib of the outer cover are realized at the same time, achieving an integrated effect with good stiffness and formability. Specific Implementation Example 2: Reference Figure 1A closed annular or semi-annular rib is formed around the rounded corner area 8. The lower die is provided with an annular reverse groove inside the rounded corner area 8. The pressure ring 6 controls the material flow to avoid cracking or wrinkling. When stretching begins, the material in the rounded corner area 8 flows under tensile stress. The sheet metal is pressed into the annular reverse groove of the lower die. The groove plastically deforms the material into an annular rib parallel to the small rounded corner surface. The rib is integrally formed with the body. The annular structure can disperse the stress in the rounded corner area in a circumferential direction, providing more uniform fence-like stiffness support. It is particularly good at resisting local torsional deformation and has more advantages in improving the overall impact resistance and vibration resistance of the small rounded corner area.

[0021] In summary: 1. The use of rib groove 9 realizes the integrated rib design, which significantly improves the local bending stiffness and torsional stiffness of the rounded corner area 8 of the outer cover, and effectively suppresses the vibration and deformation of this area; 2. By adopting the rib groove 9, the rib is realized as an integrated structure. The optimization of its design parameters can help control the material flow in the rounded corner area 8, which may alleviate the stress concentration during the drawing process to a certain extent. This is especially important for thin plate stretching parts. 3. The integrated structure allows the ribs and body to be formed as one piece, avoiding the need for welded reinforcing plates, resulting in a compact structure and minimal increase in overall weight.

[0022] 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.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An integrated rib structure with enhanced stiffness at small rounded corners for an outer cover, comprising a stamping die (1), characterized in that: The stamping die (1) is provided with a press (2) on the outside, a pressure column (3) on the top of the stamping die (1), and a pressure ring (6) at the center of the stamping die (1). The stamping die (1) includes an upper die base (101) and a lower die base (102). The bottom of the upper die base (101) is provided with a guide sleeve (4), the top of the lower die base (102) is provided with a guide column (5), and the bottom center of the upper die base (101) is provided with a pressure ring (6).

2. The integrated rib structure with enhanced stiffness at small rounded corners for an outer covering as described in claim 1, characterized in that: The lower mold base (102) is provided with a forming groove (7) on its top.

3. The integrated rib structure with enhanced stiffness and small rounded corners for an outer covering as described in claim 1, characterized in that: The pressure ring (6) is annular in shape.

4. The integrated rib structure with enhanced stiffness at small rounded corners for an outer covering as described in claim 2, characterized in that: The forming groove (7) has a rounded corner area (8) on one side.

5. The integrated rib structure with enhanced stiffness at small rounded corners for an outer covering as described in claim 4, characterized in that: The rounded corner area (8) has a rib groove (9) inside.

6. The integrated rib structure with enhanced stiffness at small rounded corners for an outer covering as described in claim 5, characterized in that: The rib groove (9) extends along the curvature direction of the rounded corner region (8).

7. The integrated rib structure with enhanced stiffness at small rounded corners for an outer covering as described in claim 5, characterized in that: The cross-sectional shape of the rib groove (9) is U-shaped.

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