Connecting structure for internal support and exterior trimming part of automobile
Through split internal bracket design and ultrasonic puncture welding technology, the problem of dimensional error after welding of the internal bracket and skin of the car is solved, the welding quality and performance are improved, and the production cost is reduced.
Patent Information
- Application Number
- CN202411712712.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-03-07
AI Technical Summary
There is a dimensional error after welding the existing car internal brackets with skins, and the integral brackets are difficult to release, the mold cost is high, and the injection molding deformation is serious.
The split internal bracket design is adopted, and the front-retaining skin and plastic bracket are connected through ultrasonic puncture welding technology to reduce the number of parts, optimize the mold design, and reduce costs.
It significantly improves the overall performance of the product, improves welding quality and stability, reduces defect rate and defective yield rate, realizes material and energy savings, and reduces production costs.
Smart Images
Figure CN119568028A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of connection between an internal support and an external decoration of an automobile, and in particular to a connection structure between an internal support and an external decoration of an automobile. Background Art
[0002] Existing automobile internal brackets are generally integrated, which makes demoulding difficult, the mold manufacturing cost is relatively high, and the volume is relatively large. Injection deformation is relatively serious, the internal bracket and the skin cannot be completely matched, and there is a dimensional error in the product after the internal bracket and the skin are welded.
[0003] Therefore, it is necessary to provide a connection structure between an internal bracket and an external trim of an automobile to solve the above technical problems. Summary of the invention
[0004] In order to solve the above technical problems, the present invention provides a connection structure between an internal bracket and an external trim of an automobile.
[0005] The present invention provides a connection structure between an internal bracket and an exterior trim of an automobile, comprising a front guard skin, wherein a left plastic bracket, a right plastic bracket and a middle plastic bracket arranged between the left plastic bracket and the right plastic bracket are welded and fixed to the inner side of the front guard skin, wherein the left plastic bracket, the right plastic bracket and the left plastic bracket are all provided with a plurality of welding portions for connecting with the front guard skin, and the welding portions are in contact with the front guard skin, wherein the left plastic bracket, the right plastic bracket and the middle plastic bracket are all provided with buckles, and at least two welding portions are arranged around the buckles, wherein the two ends of the welding portions are welding points, and the welding portions are arranged in an inwardly recessed manner;
[0006] A positioning groove is provided on the front protection skin, one end of the middle plastic bracket is arranged in the positioning groove, a stress avoidance gap is provided between the middle plastic bracket and the front protection skin, and an easy-pry gap is provided between the end of the middle plastic bracket away from the positioning groove and the front protection skin.
[0007] Preferably, when the front protective skin, the left plastic bracket, the right plastic bracket and the middle plastic bracket are made of PP material, the thickness of the welding area between the front protective skin and the welding part is 3.2 to 3.5 mm, and the thickness of the welding part is 1.2 to 1.5 mm.
[0008] Preferably, when the front skin, the left plastic bracket, the right plastic bracket and the middle plastic bracket are made of PC / ABS material, the thickness of the welding area between the front skin and the welding part is .~.mm, and the thickness of the welding part is 1.2-1.5mm.
[0009] Preferably, before the welding portion is welded to the front protection skin, the curvature of the welding surface of the welding portion changes within 0.2 mm.
[0010] Preferably, the welding portion is square, with a length of 30 to 35 mm and a width of 16 to 20 mm.
[0011] Preferably, a reinforcement structure is provided around the welding portion.
[0012] Preferably, the reinforcement structure is a reinforcement rib or a flange, and the width of the reinforcement structure is 1.5 to 2.0 mm and the height is 2 to 5 mm.
[0013] Preferably, flanges are provided at the edges of the left plastic bracket, the right plastic bracket and the middle plastic bracket.
[0014] Compared with the related art, the present invention has the following beneficial effects:
[0015] With the rapid development of new energy vehicles, the structural design of the connection between the bracket and the skin is limited. Ultrasonic puncture welding technology achieves a firm connection between different materials through precise puncture action and efficient welding process, significantly improving the overall performance of the product. Compared with traditional welding methods, puncture welding technology has higher welding quality and more stable welding effect, effectively reducing the defect rate and defective product rate in the welding process.
[0016] In terms of cost control, puncture welding technology has achieved significant savings by reducing material waste and energy consumption. Compared with traditional welding methods, puncture welding technology can more accurately control the welding depth and width, reducing unnecessary material consumption. In addition, by optimizing the energy input during the welding process, puncture welding technology also reduces energy consumption, further reducing production costs. According to relevant data, automobile manufacturers that use puncture welding technology have achieved more than 3% savings in both material costs and energy costs.
[0017] The welding bracket is designed from an existing integral bracket to a split bracket to reduce the injection deformation of parts, effectively ensuring the firmness of the puncture welding between the bracket and the front guard skin; the plastic welding bracket is split from one bracket into three brackets to reduce deformation. The three brackets share a set of molds, which reduces the mold size and can also reduce the mold cost, avoid excessive deformation during injection molding, and ensure product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0019] Figure 2 for Figure 1 Schematic diagram of the AA section;
[0020] Figure 3 It is a schematic diagram of the split internal support structure of the present invention;
[0021] Figure 4 This is a schematic diagram of the structure of the left plastic bracket of the present invention;
[0022] Figure 5 This is a schematic diagram of the existing product structure;
[0023] Figure 6 Schematic diagram of the existing internal support structure.
[0024] Numbers in the figure: 1. Front protector skin; 2. Left plastic bracket; 3. Right plastic bracket; 4. Middle plastic bracket; 5. Welding part; 6. Reinforcement structure; 7. Buckle. DETAILED DESCRIPTION
[0025] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.
[0026] Please refer to Figures 1 to 6 A connection structure between an internal bracket and an exterior trim of an automobile comprises a front fender skin 1, on the inner side of which a left plastic bracket 2, a right plastic bracket 3 and a middle plastic bracket 4 arranged between the left plastic bracket 2 and the right plastic bracket 3 are welded and fixed; the welding bracket is designed from an existing integral bracket to a split bracket to reduce the injection deformation of the parts, and effectively ensure the firmness of the puncture welding between the bracket and the front fender skin; the plastic welding bracket is split from one bracket into three brackets to reduce deformation, and the three brackets share a set of molds, which reduces the mold size and can also reduce the mold cost.
[0027] The left plastic bracket 2, the right plastic bracket 3 and the left plastic bracket 2 are all provided with a plurality of welding parts 5 for connecting with the front bumper skin 1, and the welding parts 5 are in contact with the front bumper skin 1. The left plastic bracket 2, the right plastic bracket 3 and the middle plastic bracket 4 are all provided with buckles 7, and at least two welding parts 5 are provided around the buckle 7. The position design of the welding area is a key element in the puncture welding structure. The position of the welding point should ensure that it can effectively disperse and transmit the force when subjected to external force to avoid stress concentration and fracture. The spacing and arrangement of the welding points are also factors that need to be paid attention to in the puncture welding design. Too small spacing between welding points may cause the welding area to be too concentrated, increase the difficulty of welding and the risk of deformation; while too large spacing between welding points may reduce the connection strength and affect the overall performance of the bumper. Therefore, in the design process, the spacing and arrangement of welding points should be reasonably determined according to the specific structural requirements, material properties and process conditions.
[0028] The two ends of the welding part 5 are welding points for indicating the welding head, and the welding part 5 is recessed to facilitate finding the welding points;
[0029] The front protective skin 1 is provided with a positioning groove 8, and one end of the intermediate plastic bracket 4 is arranged in the positioning groove 8. A stress avoidance gap 9 is provided between the intermediate plastic bracket 4 and the front protective skin 1 to release stress during welding and use to prevent desoldering. An easy-pry gap 10 is provided between the end of the intermediate plastic bracket 4 away from the positioning groove and the front protective skin 1 to facilitate replacement when damaged.
[0030] If the parts have greater force requirements, such as the middle support bracket of the front bumper, the spacing between the welding points is required to be 60 to 120 mm; other conventional spacings are 120 to 150 mm.
[0031] When the front protective skin 1, the left plastic bracket 2, the right plastic bracket 3 and the middle plastic bracket 4 are made of PP material, the thickness of the welding area between the front protective skin 1 and the welding part 5 is 3.2-3.5mm, and the thickness of the welding part 5 is 1.2-1.5mm. When the front protective skin 1, the left plastic bracket 2, the right plastic bracket 3 and the middle plastic bracket 4 are made of PC / ABS material, the thickness of the welding area between the front protective skin 1 and the welding part 5 is 3.0-3.5mm, and the thickness of the welding part 5 is 1.2-1.5mm (too thin material thickness may result in insufficient welding strength, while too thick material thickness will increase welding difficulty and cost. Therefore, in the design process, the material thickness of the front protective skin 1 and its left plastic bracket 2, right plastic bracket 3 and middle plastic bracket 4 plastic parts should be reasonably selected according to specific structural requirements, material properties and process conditions. In order to ensure the versatility of the welding head of the welding robot, try to balance the welding mark and pulling force through the welding head design and bracket structure design.).
[0032] Before the welding part 5 is welded to the front protective skin 1, the curvature of the welding surface of the welding part 5 changes within 0.2mm (the welding surface should be flat and smooth, free of impurities such as oil and dust to ensure the welding quality. At the same time, the shape and size of the welding surface should also match the welding head to ensure smooth welding. During the design process, the welding surface should be fully considered and planned to ensure welding quality and efficiency.
[0033] When welding the welding surface, you need to pay attention to the following: ensure that the weldment and the base material fit closely; the welding direction of the welding head is perpendicular to the welding surface; the curvature change of the welding surface is within 0.2mm, otherwise the welding head needs to be designed in a contoured manner, etc.).
[0034] The welding portion 5 is square, with a length of 30 to 35 mm and a width of 16 to 20 mm.
[0035] A reinforcement structure 6 is arranged around the welding portion 5 .
[0036] The reinforcement structure 6 is a reinforcement rib or a flange, and the width of the reinforcement structure 6 is 1.5-2.0 mm and the height is 2-5 mm.
[0037] The edges of the left plastic bracket 2, the right plastic bracket 3 and the middle plastic bracket 4 are all provided with flanges to ensure strength and stability.
[0038] A set of robot puncture welding equipment only needs to replace the jig and switch the welding process parameters to achieve the welding of parts for different projects.
[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A connection structure between an internal bracket and an external trim of an automobile, characterized in that: The invention comprises a front protective skin (1), wherein a left plastic bracket (2), a right plastic bracket (3) and a middle plastic bracket (4) arranged between the left plastic bracket (2) and the right plastic bracket (3) are welded and fixed on the inner side of the front protective skin (1), wherein the left plastic bracket (2), the right plastic bracket (3) and the left plastic bracket (2) are all provided with a plurality of welding parts (5) for connecting with the front protective skin (1), and the welding parts (5) are in contact with the front protective skin (1), wherein the left plastic bracket (2), the right plastic bracket (3) and the middle plastic bracket (4) are all provided with buckles (7), and at least two welding parts (5) are arranged around the buckle (7), wherein the two ends of the welding parts (5) are welding points, and the welding parts (5) are arranged inwardly; The front protective skin (1) is provided with a positioning groove (8), one end of the intermediate plastic bracket (4) is arranged in the positioning groove (8), a stress avoidance gap (9) is provided between the intermediate plastic bracket (4) and the front protective skin (1), and an easy-pry gap (10) is provided between the end of the intermediate plastic bracket (4) away from the positioning groove and the front protective skin (1).
2. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: When the front protective skin (1), the left plastic bracket (2), the right plastic bracket (3) and the middle plastic bracket (4) are made of PP material, the thickness of the welding area between the front protective skin (1) and the welding part (5) is 3.2 to 3.5 mm, and the thickness of the welding part (5) is 1.2 to 1.5 mm.
3. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: When the front protective skin (1), the left plastic bracket (2), the right plastic bracket (3) and the middle plastic bracket (4) are made of PC / ABS material, the thickness of the welding area between the front protective skin (1) and the welding part (5) is 3.0-3.5 mm, and the thickness of the welding part (5) is 1.2-1.5 mm.
4. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: Before the welding portion (5) and the front protective skin (1) are welded, the curvature of the welding surface of the welding portion (5) changes within 0.2 mm.
5. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: The welding portion (5) is square in shape, with a length of 30 to 35 mm and a width of 16 to 20 mm.
6. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: A reinforcement structure (6) is provided around the welding portion (5).
7. The connection structure of an automobile interior bracket and an exterior trim according to claim 6, characterized in that: The reinforcing structure (6) is a reinforcing rib or a flange, and the width of the reinforcing structure (6) is 1.5 to 2.0 mm, and the height is 2 to 5 mm.
8. The connection structure of an automobile interior bracket and an exterior trim according to claim 1, characterized in that: The edges of the left plastic bracket (2), the right plastic bracket (3) and the middle plastic bracket (4) are all provided with flanges.