Double-shot molding headlamp decoration strip and automobile assembly

Abstract

The utility model provides a double-shot molding headlamp decorative strip and an automobile assembly, and belongs to the field of structural design of automobile exterior trimming parts. The double-shot molding headlamp decoration strip comprises a soft rubber part and a hard rubber part, the sections of the soft rubber part and the hard rubber part are connected, and the connected section of the soft rubber part and the hard rubber part is of a stepped structure with an inclined plane facing an inclined plane. According to the utility model, the fitting degree between soft rubber and hard rubber in double-shot molding is improved by changing the structure, and the strength of parts is increased; the headlamp decoration strip can be effectively produced in mass, the process of welding soft rubber is gradually replaced, and the assembling time is saved.

Description

Technical Field

[0001] The utility model belongs to the field of automobile exterior component structural design, and particularly relates to a two-color injection molded headlight trim strip and an automobile component. Background Art

[0002] As people increasingly pursue a quality lifestyle, they place increasingly stringent demands on product appearance and quality. To meet this demand, automotive exterior trims require enhanced quality through new technologies and structures. This requires a more robust structure that closely matches the dimensions of the counterpart. Two-shot injection molding, a process commonly used for exterior plastic parts, combines soft and hard plastic molding to enable the development of exterior trims with demanding appearances and complex structures. For example, between the trim strip and the headlights, two-shot molding can achieve a matching finish by injecting the soft plastic inside the hard plastic.

[0003] Traditionally, the headlight trim is made by injection molding PMMA+ASA hard plastic material (PMMA stands for Polymethyl Methacrylate, a high molecular weight polymer also known as acrylic or organic glass; ASA is a ternary polymer composed of acrylonitrile, styrene, and acrylic rubber, and is an impact-modified resin) and TPE soft plastic material (TPE stands for Thermoplastic Elastomer, also known as artificial rubber or synthetic rubber) into separate parts. The soft plastic trim 01 is then assembled onto the hard plastic trim 02 using ultrasonic puncture welding combined with screws 03 to form multiple weld points 04 at the connection. Figure 1 and Figure 2 This traditional technology has complex processes, high development costs, and extremely low assembly efficiency, and has therefore gradually withdrawn from the market for the development of headlight trim strips.

[0004] The existing two-color injection molding headlight trim is mostly made of ASA hard plastic material and TPE soft plastic material. The structure adopts the connection mode of soft and hard plastic sections. The soft plastic part 1 is matched with the headlight 3. Figure 3 and Figure 4 In an existing embodiment, as shown. Figure 5 As shown, the connection between the soft rubber part 1 and the hard rubber part 2 is a planar structure with the front faces facing each other, and a staggered step of L1 = 1.0mm is reserved between the connecting sections, which to a certain extent increases the contact area between the two materials and the structural strength of the product. However, due to the general bonding between ASA and TPE, the contact length formed in the part cross section is only 3.25mm, and the force F generated by the soft rubber part 1 being squeezed by the headlight 3 is distributed between the first contact surface 4 and the second contact surface 5. Figure 6 As shown in the figure, the force-bearing area of ​​the part cross section is too small, and the average force per square millimeter is greater. In addition, the part structure is simple and the strength is insufficient, so the problem of soft glue falling off will still occur during mass production.

[0005] In summary, the stability of two-color injection molded products is affected by the bonding properties of the two materials and the connection structure of the two materials. Therefore, in the development process of two-color injection molded headlight trims, the selection of soft and hard plastic materials and the design of the connection structure between the two materials become the key targets to be overcome. Utility Model Content

[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a two-color injection molded headlight trim and automobile component. By improving the connection structure between the soft and hard rubber, a close fit between the soft and hard rubber in the two-color injection molding is achieved, thereby increasing the structural strength of the parts.

[0007] The utility model is realized through the following technical solutions:

[0008] A two-color injection molded headlight trim strip comprises a soft rubber part and a hard rubber part, wherein the cross sections of the soft rubber part and the hard rubber part are connected, and the cross section where the soft rubber part and the hard rubber part meet is a stepped structure with inclined planes facing inclined planes.

[0009] Preferably, the stepped structure of the inclined surface to the inclined surface includes a first contact inclined surface, a second contact inclined surface and an offset segment surface arranged between the first contact inclined surface and the second contact inclined surface, and the first contact inclined surface, the offset segment surface and the second contact inclined surface are connected in sequence in a Z shape.

[0010] Preferably, the included angles between the first contact inclined surface, the second contact inclined surface and the offset segment surface are all obtuse angles.

[0011] Preferably, the first contact inclined surface and the second contact inclined surface are both parallel to the right side surface of the hard rubber portion.

[0012] Preferably, the lower end of the soft rubber part is extended obliquely downward along the right side of the hard rubber part, so that the area of ​​the second contact inclined surface is equal to that of the first contact inclined surface.

[0013] Preferably, the offset segment is rotated by a preset angle in a direction parallel to the first contact inclined surface and the second contact inclined surface.

[0014] Preferably, chamfers are respectively provided at positions where the offset segment surface intersects with the first contact inclined surface and the second contact inclined surface.

[0015] Preferably, the radius R of the rounded corners ranges from [1.0 mm to 1.5 mm].

[0016] Preferably, the headlight trim is formed by integral injection molding of soft and hard plastic.

[0017] An automobile component comprises a headlight and a two-color injection molded headlight trim strip as described above, wherein the headlight and the two-color injection molded headlight trim strip are matched with each other.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The double-color injection molded headlight trim provided by the present invention improves the fit between the soft and hard plastics in the double-color injection molding process by changing the structure, so that the headlight trim can be effectively mass-produced, gradually replacing the process of welding soft plastic, saving assembly time and greatly improving production efficiency.

[0020] 2. The two-color injection-molded headlight trim provided by the present invention has a simple and stable structure and a small overall volume. Compared with traditional technologies, it achieves the effect of reducing the weight of parts and greatly saves development costs and time; compared with the existing two-color injection-molded headlight trim structure, it achieves the effect of increasing the strength of parts.

[0021] 3. The double-color injection-molded headlight trim provided by the present invention adopts soft and hard plastic integrated injection molding, the size is easy to control and stable, the product qualification rate is high, the reliability is good, and it can better ensure a good match with the headlight glass, effectively reducing related perceived quality issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the headlight trim in conventional technology;

[0023] Figure 2 It is a rear view of the headlight trim in traditional technology;

[0024] Figure 3 This is an overall picture of the existing two-color injection molded headlight trim matching the headlight;

[0025] Figure 4 For the Figure 3 Partial view after AA section;

[0026] Figure 5 A cross-sectional detail of the two-color injection molding structure of an existing two-color injection molding headlight trim.

[0027] Figure 6 This is a cross-sectional force diagram of the two-color injection structure in the existing two-color injection headlight trim;

[0028] Figure 7 This is a cross-sectional detail diagram of the two-color injection structure of the two-color injection molded headlight trim of the present invention;

[0029] Figure 8This is a cross-sectional force diagram of the double-color injection structure in the double-color injection molded headlight trim of the present invention.

[0030] 01 soft rubber trim, 02 hard rubber trim, 03 screw, 04 welding point; 1 soft rubber part, 2 hard rubber part, 3 headlight, 4 first contact surface, 5 second contact surface, 6 offset section surface; 7 soft rubber part, 8 hard rubber part, 9 offset section surface, 10 first contact inclined surface, 11 second contact inclined surface. DETAILED DESCRIPTION

[0031] The present invention is described in further detail below with reference to the accompanying drawings:

[0032] like Figure 5 and Figure 6 As shown, the existing two-color injection molding headlight trim includes a soft plastic part 1 and a hard plastic part 2, and its cross section ( Figure 5 and Figure 6 The front view (in the figure) resembles a side view of the connection between the palm and the arm. The section where the soft and hard plastics meet is located at the center of the palm, namely the first contact surface 4 and the second contact surface 5. A staggered step difference L1 is reserved between the connecting sections, forming a staggered segment 6 between the first contact surface 4 and the second contact surface 5. Staggered segment 6 is substantially parallel to the upper and lower surfaces of the component in which it is located. The first contact surface 4 and the second contact surface 5 are arranged parallel to each other and form a right angle with the staggered segment 6.

[0033] like Figure 7 As shown, the present invention proposes a novel two-color injection molded headlight trim structure, wherein the connection between the soft rubber portion 7 and the hard rubber portion 8 is a stepped structure of bevel to bevel, wherein the stepped structure comprises a first contact bevel 10, a second contact bevel 11, and a dislocation segment 9 disposed between the first contact bevel 10 and the second contact bevel 11. The first contact bevel 10, the dislocation segment 9, and the second contact bevel 11 are sequentially connected in a Z-shape. Specifically, based on the existing structure, the first contact surface 4 and the second contact surface 5 can be rotated and tilted in the same direction relative to the dislocation segment 6 to form the first contact bevel 10 and the second contact bevel 11. After tilting, the angles between the first contact bevel 10, the second contact bevel 11, and the dislocation segment 6 are all obtuse. The optimal inclination angle is that the first contact bevel 10 and the second contact bevel 11 are both parallel to the right side (non-cross-section) of the hard rubber part 8, so as to obtain the maximum contact area between the soft rubber part 7 and the hard rubber part 8. By increasing the contact area, the pulling force between the two is increased, thereby effectively solving the problem of soft rubber falling off.

[0034] In addition, the lower end of the soft rubber part 7 is extended obliquely downward along the right side of the hard rubber part 8, so that the second contact slope 11 and the first contact slope 10 form a contact area of ​​nearly equal size, that is, the area of ​​the second contact slope 11 is equal to that of the first contact slope 10. In this way, when the upper end of the soft rubber part 7 is subjected to force (the deformation due to force is as shown in FIG. Figure 8 If the second contact bevel 11 is too small, the lower end of the soft rubber part 7 may be unable to withstand too little pulling force, causing it to break away in the opposite direction. If the second contact bevel 11 is too large, material will be wasted, making the overall weight of the part too large.

[0035] Furthermore, the offset segment 6 is rotated by a preset angle in a direction parallel to the first contact bevel 10 and the second contact bevel 11, and then the positions where it intersects with the first contact bevel 10 and the second contact bevel 11 are smoothed to form an offset segment 9, so that the offset segment difference L1 is extended to L2. That is, the bending parts of the cross sections where the soft and hard rubbers meet are rounded, and the bending parts of the cross sections are changed to smooth contact, so that the first contact bevel 10 and the second contact bevel 11 are connected smoothly, reducing the possibility of sudden stress changes on the mold, which is beneficial to the fitting of soft and hard rubbers. The value range of the fillet radius R is usually between 1.0 and 1.5 mm, which is determined according to the size of the connected cross sections. After the fillet, the two endpoints of L2 are the lower endpoint of the lower chamfer and the upper endpoint of the upper chamfer, corresponding to Figure 7 The left and right ends of the .

[0036] like Figure 7 and Figure 8 As shown, the right side of the soft rubber part 7 is also adjusted accordingly, and the outer contour shape after adjustment ( Figure 7 and Figure 8 The cross-sectional shape of the soft and hard rubber parts is the same or similar. This adjustment is to make the upper end of the soft rubber part 7 fit the headlight 3, and the lower end can reduce the material thickness to prevent the accumulation of feed on the mold, and can also reduce the weight of the part and prevent waste of material.

[0037] The dual-injection headlight trim provided by this utility model utilizes a single-piece injection molding process of soft and hard plastic. The hard plastic portion is made of ASA+PMMA, while the soft plastic portion is made of TPE. Compared to traditional headlight trims that rely on welding and fastening, this design significantly reduces the amount of soft plastic used, resulting in a lighter overall weight and a more compact structure. This significantly reduces the number of assembly steps and facilitates installation.

[0038] The two-shot injection-molded headlight trim provided by this utility model retains the bending feature at the junction of the soft and hard plastic sections. The section where the hard plastic section 8 contacts the soft plastic section 7 is changed to an oblique section, increasing the contact area between the soft plastic section 7 and the hard plastic section 8, effectively solving the problem of soft plastic shedding caused by insufficient cross-sectional contact area. The bend in the section is rounded to make the connection smoother and increase the flexural strength of the turning point. Furthermore, the change to a smooth contact helps to increase the fit between the surfaces, making the part structure more stable and solving the problem of soft plastic shedding caused by insufficient structural strength.

[0039] like Figure 8 As shown, the force F generated by the squeezing of the headlight 3 on the double-shot injection molding headlight trim of the present invention will be distributed between the first contact bevel 10 and the second contact bevel 11, and the force per unit area will be reduced compared to before the change. At the same time, the stepped double-shot molding structure of the bevel against the bevel solves the long-standing perceived quality problems (for example, the soft glue shedding problem of the existing double-shot molding and the gap problem between the soft and hard glue caused by the welding error in the traditional welding soft glue mode), greatly improving the product quality pass rate and production efficiency. The soft and hard glue are integrally injection molded, and the appearance and texture match the counterpart well, which further guarantees the perceived quality of the appearance of the headlight glass.

[0040] The following is a specific embodiment of the present invention:

[0041] like Figure 7 As shown, the two-shot injection-molded headlight trim in this embodiment includes a soft plastic portion 7 and a hard plastic portion 8. The cross-section where the soft and hard plastics meet is tilted to the right, forming a first contact slope 10 and a second contact slope 11. Specifically, the contact surface between the hard plastic portion 8 and the soft plastic portion 7 is designed based on the structure of the part itself, and is parallel to the right side (not the cross-section) of the hard plastic portion 8.

[0042] The lower end of the soft rubber portion 7 extends obliquely downward along the surface in contact with the hard rubber portion 8 , so that the second contact inclined surface 11 and the first contact inclined surface 10 form an equal contact area.

[0043] After the offset segment surface 6 is tilted 3° in the counterclockwise direction, the positions where the offset segment surface intersects with the first contact inclined surface 10 and the second contact inclined surface 11 are rounded by R1.2 to form the offset segment surface 9, and at the same time, L2 on the part cross section is made 2.30 mm.

[0044] like Figure 7 and Figure 8 As shown, the right side of the soft rubber part 7 is a structure designed based on the extension of the part itself, with the upper end fitting with the headlight glass and the lower end being designed to reduce the material thickness.

[0045] The double-shot injection-molded headlight trim provided in this embodiment has a contact length of 7.74 mm formed on the soft and hard plastic sections, which increases the contact area by 138.15% compared to before the change.

[0046] like Figure 8 As shown, the force F generated by the extrusion of the headlight 3 on the double-shot injection molded headlight trim in this embodiment is distributed on the first contact slope 10 and the second contact slope 11, and the force per square millimeter is reduced by about 58.0% compared with before the change.

[0047] The utility model also provides an automobile component, which includes a headlight and a two-color injection molded headlight trim strip of any of the above structures, and the headlight is matched with the two-color injection molded headlight trim strip without any stickers.

[0048] This utility model provides a two-color injection molding structure for automotive headlight trim, achieving a secure bond between two different materials within the two-color injection molded part. This new technical solution solves the problem of soft adhesive peeling and provides a new direction and reference for the subsequent design and development of two-color injection molded trims.

[0049] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0050] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0051] The above technical solution is only one implementation method of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A two-color injection molded headlight trim strip, comprising a soft rubber portion and a hard rubber portion, wherein the cross sections of the soft rubber portion and the hard rubber portion are connected, characterized in that: The cross section where the soft rubber part and the hard rubber part meet is a stepped structure with slope facing slope; The stepped structure of inclined surface to inclined surface includes a first contact inclined surface, a second contact inclined surface and a staggered segment surface arranged between the first contact inclined surface and the second contact inclined surface, and the first contact inclined surface, the staggered segment surface and the second contact inclined surface are sequentially connected in a Z shape.

2. The two-color injection molded headlight trim according to claim 1, characterized in that: The included angles between the first contact inclined surface, the second contact inclined surface and the dislocation segment surface are all obtuse angles.

3. The two-color injection molded headlight trim according to claim 2, characterized in that: The first contact inclined surface and the second contact inclined surface are both parallel to the right side surface of the hard rubber part.

4. The two-color injection molded headlight trim according to claim 3, characterized in that: The lower end of the soft rubber portion is extended obliquely downward along the right side of the hard rubber portion so that the area of ​​the second contact inclined surface is equal to that of the first contact inclined surface.

5. The two-color injection molded headlight trim according to claim 1, characterized in that: The dislocation segment is rotated by a preset angle in a direction parallel to the first contact inclined surface and the second contact inclined surface.

6. The two-color injection molded headlight trim according to claim 1, characterized in that: The positions where the dislocation segment surface intersects with the first contact inclined surface and the second contact inclined surface are respectively provided with chamfered corners.

7. The two-color injection molded headlight trim according to claim 6, characterized in that: The radius R of the fillet is in the range of [1.0mm, 1.5mm].

8. The two-color injection molded headlight trim according to any one of claims 1 to 7, characterized in that: The headlight trim is made of soft and hard plastics by integrated injection molding.

9. An automobile component, characterized in that: The automobile component comprises a headlight and a two-color injection molded headlight trim strip according to any one of claims 1 to 8, wherein the headlight is matched with the two-color injection molded headlight trim strip without any sticker.

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