Forming punching die for automobile rear wheel cover
By setting grooves and ejector pin structures in the stamping die for forming the rear wheel cover of an automobile, the problem of edge shrinkage caused by insufficient fabric stretching is solved, and high-quality forming of the rear wheel cover is achieved.
Patent Information
- Application Number
- CN202520478590.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-18
AI Technical Summary
In the processing of automotive rear wheel covers, insufficient fabric extension at the curved edge of the rear wheel cover leads to edge shrinkage, affecting the pressing and molding quality.
Design a forming punching die, with a groove on the lower die and an ejector pin and elastic element on the upper die. The ejector pin is inserted into the groove and presses the fabric into the groove, increasing the stretch of the fabric at the curved surface and preventing edge shrinkage.
The molding quality of the rear wheel cover has been improved, ensuring that the fabric is fully extended at the curved surface, avoiding edge shrinkage, and improving the processing effect.
Smart Images
Figure CN223862706U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of automotive interior parts processing technology, and in particular to a forming and punching die for automotive rear wheel arches. Background Technology
[0002] Rear wheel covers are covers located above the rear wheels of a car, primarily used to protect the wheels and the car body. They are typically made of plastic, alloy, or other durable materials. A variety of molds are used in the production of automotive interior parts, mainly punching dies and plastic molds.
[0003] Currently, stamping dies are generally used in the processing of automotive rear wheel covers. These dies mainly consist of an upper die and a lower die. Since automotive rear wheel covers typically have a curved surface, the lower die has raised forming parts, while the upper die has recessed forming parts for pressing and engaging with these raised parts. During processing, the softened fabric to be pressed is placed on the lower die. The upper die moves downwards as a whole, resisting the deformation of the fabric on the lower die. Through the pressing action between the upper and lower dies, the automotive rear wheel cover can be formed in one step.
[0004] Combination Figure 1 Because the fabric at the edge of the rear wheel arch structure has a large elongation during pressing, the fabric at the edge of the rear wheel arch is prone to insufficient elongation during the deformation process of the upper mold pressing the fabric, resulting in edge shrinkage and affecting the quality of the pressed rear wheel arch. Utility Model Content
[0005] To help increase the stretch of the fabric at the curved edge of the rear wheel cover, and to prevent edge shrinkage due to insufficient fabric stretching during the rear wheel cover forming process, thereby improving the quality of the press-formed rear wheel cover to a certain extent, this application provides a forming and punching die for automobile rear wheel covers.
[0006] The technical solution provided in this application for a forming and punching die for a car rear wheel arch is as follows:
[0007] A forming and punching die for a car rear wheel cover includes an upper die and a lower die. The lower die has a forming arc surface for forming the arc surface of the rear wheel cover edge. A groove is provided on one side of the forming arc surface on the lower die. The upper die is provided with a push rod for inserting and engaging with the groove.
[0008] Preferably, the push rod includes a fixed cylinder disposed in the upper mold and a sliding rod slidably passing through the fixed cylinder. The sliding direction of the sliding rod is parallel to the sliding direction of the upper mold. The sliding rod is used to engage with the groove. An elastic element is provided between the sliding rod and the fixed cylinder to buffer the movement of the sliding rod.
[0009] Preferably, the elastic element includes a spring disposed between the fixed cylinder and the sliding rod, the spring extending in a direction parallel to the sliding direction of the sliding rod.
[0010] Preferably, the upper mold includes an upper mold base and an upper template disposed on the upper mold base, the lower mold includes a lower mold base and a lower template disposed on the lower mold base, the fixing cylinder is disposed inside the upper template, the sliding rod slides through the upper template, the groove is formed on the lower template, and the forming arc surface is located on the lower template.
[0011] Preferably, the upper template has two rear wheel cover forming cavities for pressing and engaging with the lower template. The two rear wheel cover forming cavities are mirror-distributed along the centerline of the upper template, and the push rod is located between the two rear wheel cover forming cavities.
[0012] Preferably, the sliding rod includes a first rod body, a second rod body, and a third rod body connected in sequence. The first rod body slides inside the fixed cylinder. The elastic element is disposed between the first rod body and the fixed cylinder. The third rod body is used to engage with the groove. The side of the third rod body away from the first rod body is an arc surface, and the arc surface protrudes outward in the direction away from the first rod body.
[0013] Preferably, the diameter of the first rod is smaller than the diameter of the second rod, the diameter of the third rod is smaller than the diameter of the first rod, the diameter of the second rod is equal to the inner diameter of the fixed cylinder, and the third rod slides through the upper template.
[0014] Preferably, the diameter of the groove increases toward the upper mold.
[0015] Preferably, multiple grooves are provided, and each top rod corresponds to a groove. The arrangement direction of the multiple grooves is parallel to the length direction of the formed wheel cover.
[0016] In summary, this application includes the following beneficial technical effects:
[0017] When the upper mold moves towards the lower mold to press the fabric, the ejector pin first presses the fabric near the forming arc surface and moves it to the groove of the lower mold, pressing the fabric in the groove. This increases the amount of fabric stretching at the forming arc surface of the rear wheel cover, making it less likely to shrink due to insufficient fabric stretching during the forming process of the rear wheel cover, thus helping to improve the quality of the pressed rear wheel cover. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the pressed and molded rear wheel cover of a car in the embodiments of this application, mainly used to show the curved edge of the rear wheel cover with a large amount of fabric stretch.
[0019] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.
[0020] Figure 3 This is a bottom view of the overall structure of the upper mold in the embodiment of this application.
[0021] Figure 4 This is an exploded cross-sectional view of the lower mold and ejector pin in an embodiment of this application.
[0022] Explanation of reference numerals in the attached drawings: 1. Upper mold; 11. Upper mold base; 12. Upper template; 2. Lower mold; 21. Lower mold base; 22. Lower template; 3. Forming arc surface; 4. Groove; 5. Ejector rod; 51. Fixing cylinder; 52. Sliding rod; 521. First rod body; 522. Second rod body; 523. Third rod body; 6. Spring; 7. Rear wheel cover forming cavity; 8. Rear wheel cover edge arc surface. Detailed Implementation
[0023] The following combination Figures 2-4 This application will be described in further detail.
[0024] This application discloses a forming and punching die for a car rear wheel arch. (Refer to...) Figure 2 and Figure 3 The forming and punching die for automotive rear wheel arch covers includes an upper die 1 and a lower die 2. The upper die 1 includes an upper die base 11 and an upper template 12, with the upper template 12 fixedly installed on the side of the upper die base 11 near the lower die 2. The lower die 2 includes a lower die base 21 and a lower template 22, with the lower template 22 fixedly installed on the side of the lower die base 21 near the upper die 1. Both the upper template 12 and the lower template 22 have hollow interiors, and these hollow interiors are reinforced and fixed by multiple support rods arranged horizontally and vertically. This not only helps to reduce the weight of the upper template 12 and the lower template 22 but also ensures structural strength.
[0025] Reference Figure 2 and Figure 3 Since the rear wheel arch has an arc-shaped structure, in order to facilitate the pressing and forming of the rear wheel arch, the lower template 22 has a raised forming part, and the upper template 12 has a rear wheel arch forming cavity 7 for pressing and cooperating with the raised forming part on the lower template 22. The raised forming part on the lower template 22 has a forming arc surface 3 for forming the arc surface of the edge of the rear wheel arch, so that the upper mold 1 moves downward as a whole, and by abutting against the fabric deformation on the lower template 22, the rear wheel arch forming cavity 7 on the upper template 12 and the raised forming part on the lower template 22 are pressed together.
[0026] Reference Figure 2 and Figure 3 The lower template 22 has a groove 4 on one side of the forming arc surface 3. The upper template 12 has a push rod 5 on the side near the lower mold 2 for interlocking with the groove 4. The push rod 5 is misaligned with the rear wheel cover forming cavity 7 on the upper template 12.
[0027] When the upper mold 1 moves towards the lower mold 2 to press the fabric, the ejector pin 5 first presses against the softened fabric and moves towards the groove 4 of the lower mold 2, pressing the fabric into the groove 4. This increases the fabric stretch at the rear wheel cover forming arc surface 3, making it less prone to edge shrinkage due to insufficient fabric stretching during the rear wheel cover forming process, thus helping to improve the quality of the pressed rear wheel cover. Specifically, the elongation of the ejector pin 5 and the depth of the groove 4 are set as needed.
[0028] Reference Figure 2 and Figure 3 To improve processing efficiency and equipment utilization, the upper template 12 has two rear wheel cover forming cavities 7, and the lower template 22 also has two protruding forming parts. The forming arc surface 3 corresponds one-to-one with the protruding forming parts. The arrangement direction of the two rear wheel cover forming cavities 7 and the arrangement direction of the two protruding forming parts are both perpendicular to the length direction of the formed rear wheel cover. Furthermore, the two rear wheel cover forming cavities 7 on the upper template 12 and the two protruding forming parts on the lower template 22 are mirror images of each other along the centerline of the upper template 12, which refers to the axis of symmetry of the two rear wheel cover forming cavities 7. This results in the groove 4 being located between the two forming arc surfaces 3 of the two protruding forming parts, and the push rod 5 being located between the two rear wheel cover forming cavities 7.
[0029] During the pressing process of the upper template 12 and the lower template 22, the fabric can be pressed to process two rear wheel covers at the same time. Furthermore, the extension of the fabric at the two forming arc surfaces 3 can be increased through the cooperation of the top rod 5 and the groove 4, thereby ensuring the quality of the rear wheel covers on both sides.
[0030] Reference Figure 3 and Figure 4 To ensure sufficient fabric extension at the curved edge of the rear wheel cover, multiple grooves 4 are provided, with each top rod 5 corresponding to a groove 4. The arrangement of the multiple grooves 4 is parallel to the length direction of the formed rear wheel cover. In this embodiment, four grooves 4 and four top rods 5 are provided. In other embodiments, the number of grooves 4 and top rods 5 can be set as needed. Additionally, the top rods 5 and grooves 4 can be placed at other locations with greater fabric stretch to ensure sufficient fabric expansion and contraction during the pressing process.
[0031] Reference Figure 3 and Figure 4To prevent the fabric from being damaged or punctured, the top rod 5 includes a fixed cylinder 51 and a sliding rod 52. The fixed cylinder 51 is fixed inside the hollow structure of the upper template 12. The length direction of the fixed cylinder 51 is parallel to the sliding direction of the upper mold 1. The sliding rod 52 slides through the corresponding fixed cylinder 51. The sliding rod 52 slides through the side of the upper template 12 near the lower template 22. The sliding direction of the sliding rod 52 is parallel to the sliding direction of the upper mold 1. The sliding rod 52 is used to insert and cooperate with the corresponding groove 4. An elastic element is provided between the sliding rod 52 and the fixed cylinder 51 to buffer the sliding of the sliding rod 52.
[0032] Reference Figure 3 and Figure 4 To facilitate the buffering of the sliding rod 52, the elastic element includes a spring 6 located inside the fixed cylinder 51. One end of the spring 6 is fixed to the end of the sliding rod 52, and the other end is fixed to the end of the fixed cylinder 51 away from the lower mold 2. The extension direction of the spring 6 is parallel to the sliding direction of the sliding rod 52.
[0033] When the upper mold 1 moves downward as a whole, causing the end of the sliding rod 52 to press against the fabric, the sliding rod 52 has a certain degree of buffering and elasticity under the elastic force of the spring 6, so that the sliding rod 52 is less likely to damage or puncture the fabric.
[0034] Reference Figure 3 and Figure 4 Furthermore, the sliding rod 52 includes a first rod body 521, a second rod body 522, and a third rod body 523. The first rod body 521, the second rod body 522, and the third rod body 523 are integrally formed in sequence, and the cross-sections of the first rod body 521, the second rod body 522, and the third rod body 523 are all circular. The first rod body 521 is slidably disposed inside the fixed cylinder 51. One end of the spring 6 is connected to the fixed cylinder 51, and the other end is connected to the first rod body 521. The third rod body 523 is located outside the corresponding fixed cylinder 51. The third rod body 523 is slidably disposed on the side of the upper template 12 near the lower template 22, so that the second rod body 522 is less likely to affect the pressing and forming of the fabric. The end of the third rod body 523 is used to insert and cooperate with the corresponding groove 4. In addition, to further ensure that the fabric is not easily damaged, the end of the third rod body 523 away from the first rod body 521 is an arc surface, and the arc surface protrudes outward in the direction away from the first rod body 521.
[0035] Reference Figure 3 and Figure 4 The diameter of the first rod 521 is smaller than the diameter of the second rod 522, the diameter of the third rod 523 is smaller than the diameter of the first rod 521, and the diameter of the second rod 522 is equal to the inner diameter of the fixed cylinder 51, which helps to seal the opening of the corresponding fixed cylinder 51.
[0036] Reference Figure 2 and Figure 4The diameter of the groove 4 increases towards the upper mold 1, which makes it easier for the fabric to separate from the bottom wall of the groove 4 during demolding after it moves into the groove 4 under the pressure of the sliding rod 52, thus reducing resistance.
[0037] The implementation principle of this application embodiment is as follows: When the upper mold 1 moves towards the lower mold 2 to press the fabric, the third rod 523 of the sliding rod 52 will first press the fabric against the corresponding groove 4 of the lower mold 2 and press the fabric at that location into the groove 4. Under the elastic force of the spring 6 between the sliding rod 52 and the corresponding fixed cylinder 51, the sliding rod 52 can extend and retract to a certain extent with the corresponding fixed cylinder 51, and the sliding rod 52 is not likely to damage the fabric. By pressing the fabric near the arc surface of the rear wheel cover with multiple sliding rods 52 to stretch it, the amount of fabric extension at the arc surface 3 of the rear wheel cover is increased, so that the problem of edge shrinkage due to insufficient fabric extension is not easy to occur during the rear wheel cover forming process, thereby helping to improve the quality of the pressed rear wheel cover.
[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A forming and punching die for a car rear wheel arch cover, comprising an upper die (1) and a lower die (2), characterized in that: The lower mold (2) has a forming arc surface (3) for forming the arc surface of the rear wheel cover edge. A groove (4) is provided on one side of the forming arc surface (3) on the lower mold (2). The upper mold (1) is provided with a push rod (5) for inserting and engaging with the groove (4).
2. The forming and punching die for a car rear wheel arch according to claim 1, characterized in that: The top rod (5) includes a fixed cylinder (51) disposed in the upper mold (1) and a sliding rod (52) slidably passing through the fixed cylinder (51). The sliding direction of the sliding rod (52) is parallel to the sliding direction of the upper mold (1). The sliding rod (52) is used to insert and cooperate with the groove (4). An elastic element is provided between the sliding rod (52) and the fixed cylinder (51) to buffer the movement of the sliding rod (52).
3. A forming and punching die for a car rear wheel arch according to claim 2, characterized in that: The elastic element includes a spring (6) disposed between the fixed cylinder (51) and the sliding rod (52), the extension direction of the spring (6) being parallel to the sliding direction of the sliding rod (52).
4. A forming and punching die for a car rear wheel arch according to claim 2, characterized in that: The upper mold (1) includes an upper mold base (11) and an upper template (12) disposed on the upper mold base (11). The lower mold (2) includes a lower mold base (21) and a lower template (22) disposed on the lower mold base (21). The fixed cylinder (51) is disposed inside the upper template (12). The sliding rod (52) slides through the upper template (12). The groove (4) is opened on the lower template (22). The forming arc surface (3) is located on the lower template (22).
5. A forming and punching die for a car rear wheel arch according to claim 4, characterized in that: The upper template (12) has two rear wheel cover forming cavities (7) for pressing and engaging with the lower template (22). The two rear wheel cover forming cavities (7) are mirror-distributed along the centerline of the upper template (12), and the top rod (5) is located between the two rear wheel cover forming cavities (7).
6. A forming and punching die for a car rear wheel arch according to claim 2, characterized in that: The sliding rod (52) includes a first rod body (521), a second rod body (522), and a third rod body (523) connected in sequence. The first rod body (521) slides inside the fixed cylinder (51). The elastic element is disposed between the first rod body (521) and the fixed cylinder (51). The third rod body (523) is used to insert into the groove (4). The side of the third rod body (523) away from the first rod body (521) is an arc surface, and the arc surface protrudes outward in the direction away from the first rod body (521).
7. A forming and punching die for a car rear wheel arch according to claim 6, characterized in that: The diameter of the first rod (521) is smaller than the diameter of the second rod (522), the diameter of the third rod (523) is smaller than the diameter of the first rod (521), the diameter of the second rod (522) is equal to the inner diameter of the fixed cylinder (51), and the third rod (523) slides through the upper template (12).
8. A forming and punching die for a car rear wheel arch according to claim 1, characterized in that: The diameter of the groove (4) increases toward the upper mold (1).
9. A forming and punching die for a car rear wheel arch according to any one of claims 1-8, characterized in that: The groove (4) is provided in multiple ways, and the top rod (5) corresponds to the groove (4) one by one. The arrangement direction of the multiple grooves (4) is parallel to the length direction of the molded wheel cover.