Wheel cover sound insulation pad manufacturing method, wheel cover sound insulation pad and vehicle

Abstract

The embodiment of the invention provides a wheel cover sound insulation pad manufacturing method, a wheel cover sound insulation pad and a vehicle, and the wheel cover sound insulation pad manufacturing method comprises the following steps that S1, a formed sound insulation pad is placed in a lower die of a punching die, and the sound insulation pad is made of an elastic material; s2, the upper mold provided with the steel needles and the lower mold are closed; the steel needle penetrates through the sound insulation pad to form a breakthrough hole, and the breakthrough hole is used for being matched with a connecting column arranged on an automobile body. S3, the upper mold is taken down after the pressure is maintained for a set time; the steel needles are separated from the sound insulation pad, and the breakthrough holes are gradually closed to form seams under the action of self elasticity of the sound insulation pad. By means of the structure, the mold can be manufactured more easily, the NVH effect is improved during installation, in addition, no buckle needs to be additionally arranged, the assembly time can be effectively shortened, and the cost of parts is reduced.

Description

[Technical field]

[0001] The embodiments of the present application relate to the technical field of sound insulation covers, and in particular to a method for manufacturing a wheel cover sound insulation pad, a wheel cover sound insulation pad, and a vehicle. [Background technology]

[0002] As people's requirements for quietness in the car are getting higher and higher, in order to improve the NVH performance, more and more passenger cars are designed with wheel cover sound insulation pads. The NVH performance of the wheel cover is determined by the material and the opening rate. When the material is determined, the smaller the opening rate, the better the NVH performance. The size of the opening is an important indicator affecting the opening rate. The design of the traditional wheel cover sound insulation pad generally adopts the welding of M6 studs on the body, the sound insulation pad opening φ12mm to avoid, and the buckle is assembled on the stud. The thread of the stud and the structure of the buckle interfere with each other, thereby clamping the sound insulation pad. According to this design method, there are several problems: a. The opening diameter is φ12mm, and the sound insulation pad needs to be welded on the mold. The area of ​​the sound insulation pad material cut off is Π*6*6=15.2m㎡, which affects the NVH effect; c. The sound insulation pad, buckle, and stud do not form an effective sealing structure, which affects the NVH effect; d. The assembly buckle requires increased parts cost and assembly time. [Summary of the invention]

[0003] The embodiments of the present application propose a method for manufacturing a wheel arch sound insulation pad, a wheel arch sound insulation pad and a vehicle, which relate to the technical field of wheel arch sound insulation pads. The manufacturing of molds can be simpler. During installation, the interference fit between the breakthrough hole and the stud can play a good sealing role and improve the NVH effect. In addition, the interference fit between the breakthrough hole and the stud plays a fastening role, and there is no need to set up additional buckles. The assembly time can be effectively reduced and the cost of parts can be reduced.

[0004] In a first aspect, an embodiment of the present application provides a method for manufacturing a wheel cover sound insulation pad, comprising the following steps:

[0005] S1, placing the formed sound insulation pad into the lower mold of the perforation mold, wherein the sound insulation pad is made of elastic material;

[0006] S2, closing the upper mold provided with a steel needle with the lower mold; the steel needle passes through the sound insulation pad to form a breakthrough hole, and the breakthrough hole is used to cooperate with the connecting column provided on the vehicle body;

[0007] S3, after holding the pressure for a set time, the upper mold is removed; the steel needle is separated from the sound insulation pad, and the breakthrough hole is gradually closed to form a seam under the action of the elastic force of the sound insulation pad itself.

[0008] Optionally, the connecting column is a welding stud.

[0009] Optionally, the diameter of the steel needle is smaller than the diameter of the connecting column.

[0010] Optionally, there are multiple steel needles.

[0011] Optionally, each group includes 4 to 6 steel needles, and the breakthrough holes formed by each group of the steel needles correspond to one of the connecting columns. During installation, one of the breakthrough holes formed by each group of the steel needles cooperates with the connecting column.

[0012] Optionally, each group of steel needles includes a first steel needle and multiple second steel needles, and the multiple second steel needles are distributed in a circular array with the first steel needle as the center line; the diameter of the first steel needle is equal to the diameter of the second steel needle.

[0013] Optionally, the thickness of the sound insulation pad is not greater than 10 mm.

[0014] In the second aspect, an embodiment of the present application provides a wheel arch sound insulation pad, which is made of elastic material. A breakthrough hole is provided on the sound insulation pad, and the breakthrough hole is used to cooperate with a connecting column set on the vehicle body. The diameter of the breakthrough hole is smaller than the diameter of the connecting column. The breakthrough hole is formed by penetration of a steel needle, and the breakthrough hole is a seam in a natural state.

[0015] Optionally, 4-6 breakthrough holes form a group, each group of the breakthrough holes corresponds to one connecting column, and during installation, one of the breakthrough holes in each group cooperates with the connecting column.

[0016] In a third aspect, an embodiment of the present application provides a vehicle comprising the wheel arch sound insulation pad as described above.

[0017] This application does not require welding of cutting edges on the mold. The steel needles on the mold are simpler to manufacture and easier to maintain than traditional cutting edges. The sound insulation pad material is not cut off, but only expanded by the steel needles to form a breakthrough hole. During installation, the interference fit between the breakthrough hole and the stud can play a good sealing role, thereby improving the NVH effect. In addition, the interference fit between the breakthrough hole and the stud plays a tightening role, and there is no need to set up additional buckles, which can effectively reduce assembly time and reduce the cost of parts.

Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a process for manufacturing a wheel cover sound insulation pad provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the installation structure of the steel needle and the upper mold provided in the embodiment of the present application;

[0021] Figure 3 A schematic diagram of the assembly of a breakthrough hole and a connecting column on a wheel cover sound insulation pad provided in an embodiment of the present application;

[0022] Description of reference numerals:

[0023] 1-sound insulation pad, 2-steel needle, 3-breakthrough hole, 4-connecting column, 5-upper mold, 21-first steel needle, 22-second steel needle, 6-car body. [Specific implementation method]

[0024] In order to better understand the technical solution of this specification, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] It should be clear that the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0026] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit this specification. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0027] The wheel arch sound insulation pad in this application refers to the place installed inside the vehicle body corresponding to the wheel arch.

[0028] The technical solution protected by the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1 , a method for manufacturing a wheel cover sound insulation pad provided in an embodiment of the present application, comprising the following steps:

[0030] S1. Place the formed sound insulation pad 1 into the lower mold of the perforated mold. The sound insulation pad 1 is made of an elastic material. Specifically, the sound insulation pad 1 can be made of ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA and polyurethane (PU) or elastic felt, etc. When using a felt sound insulation pad, the thickness must be less than 10 mm.

[0031] S2. The upper mold 5 provided with the steel needle 2 is molded together with the lower mold; the steel needle 2 passes through the sound insulation pad 1 to form a breakthrough hole 3, and the breakthrough hole 3 is used to cooperate with the connecting column 4 provided on the vehicle body 6; the diameter of the steel needle 2 is smaller than the diameter of the connecting column 4, so that the diameter of the formed breakthrough hole 3 is smaller than the diameter of the connecting column 4, which is convenient for interference fit with the connecting column 4; when the steel needle 2 passes through the sound insulation pad 1, the sound insulation pad material at the corresponding position is expanded, and the material is not cut off. In order to facilitate the formation of the breakthrough hole 3, the lower mold and the steel needle 2 are provided with an avoidance hole at the position opposite to the steel needle 2, and the steel needle 2 extends into the avoidance hole after passing through the sound insulation pad 1. In order to avoid misalignment when the upper mold 5 is molded together with the lower mold, resulting in the steel needle 2 being unable to correspond to the avoidance hole, a positioning device can be provided between the upper mold 5 and the lower mold, such as a positioning column can be provided on the lower mold, and a positioning hole compatible with the positioning column can be opened on the upper mold 5, and the upper mold 5 slides up and down along the positioning column to achieve mold closing and mold opening. In order to prevent the sound insulation pad 1 from moving during the film closing process, which may cause the position of the breakthrough hole 3 to be offset, a fixing device may be provided on the lower mold. After the sound insulation pad 1 is placed in the lower mold, the sound insulation pad 1 is fixed by the fixing device so that the position where the breakthrough hole 3 needs to be opened on the sound insulation pad 1 is opposite to the avoidance hole on the lower mold.

[0032] S3, after holding the pressure for the set time, remove the upper mold 5; the steel needle 2 is separated from the sound insulation pad 1, and the breakthrough hole 3 is gradually closed to form a seam under the elastic force of the sound insulation pad 1. In actual use, the holding time can be 5 minutes, 10 minutes or 20 minutes, etc. The specific time varies according to the material of the sound insulation pad 1, and the holding pressure is set according to the needs.

[0033] In specific implementation, as an implementation method, the device for providing pressure can be fixedly connected to the upper mold 5. For example, the device for providing pressure can be a hydraulic cylinder. The telescopic end of the hydraulic rod of the hydraulic cylinder is fixedly connected to the upper mold 5. The distance between the upper mold 5 and the lower mold is controlled by the telescopic movement of the hydraulic cylinder. In order to facilitate the acquisition of the pressure, a pressure sensor can be set at the connection between the hydraulic rod and the upper mold 5. When the mold is closed, the pressure can be observed through the display value of the pressure sensor.

[0034] Of course, in actual use, the device for providing pressure may also be a pneumatic cylinder, a screw structure, etc. The device for providing pressure may be fixedly connected to the upper mold 5 or not. When the device for providing pressure is not fixedly connected to the upper mold 5, the upper mold 5 is first closed onto the lower mold during use, and then the upper mold 5 is pressurized by the device for providing pressure.

[0035] Compared with setting a knife edge on the mold, the mold manufacturing is simpler and the maintenance is easier by setting the steel needle 2 on the upper mold 5.

[0036] As an implementation method, the connecting column 4 is a planted welded stud. Here, taking the stud diameter of 6 mm as an example, the diameter of the steel needle 2 is selected to be 5 mm. When the upper mold 5 is molded with the lower mold, the steel needle 2 passes through the sound insulation pad 1, and the sound insulation pad material is expanded. When demolding, a 5 mm breakthrough hole 3 will be formed where the steel needle 2 passes through, but because the sound insulation pad 1 itself is elastic, the breakthrough hole 3 will gradually close under the action of its own elasticity until it looks like a seam, close to the state of no hole. Of course, due to the different materials of the sound insulation pad 1, the time for the breakthrough hole 3 to close will be different. In actual application, the different materials of the sound insulation pad 1 will lead to different elasticities of the sound insulation pad 1. For sound insulation pads 1 with different elasticities, the diameters of the breakthrough holes 3 are different. For example, for a sound insulation pad 1 with large elasticity, a steel needle 2 with a smaller aperture than the corresponding diameter of the connecting column 4 that needs to be matched can be selected for perforation, while for a sound insulation pad 1 with relatively small elasticity, a steel needle 2 with an aperture close to the diameter of the connecting column 4 that needs to be matched can be selected for perforation.

[0037] As an implementation method, in order to avoid the failure of the breakthrough hole 3 to cooperate with the corresponding connecting column 4 due to tolerance in the assembly process, the following measures are adopted:

[0038] There are multiple steel needles 2, each group of 4-6 steel needles 2, and the breakthrough hole 3 formed by each group of steel needles 2 corresponds to a connecting column 4. During installation, one of the breakthrough holes 3 formed by each group of steel needles 2 cooperates with the connecting column 4. Each group of steel needles 2 includes a first steel needle 21 and multiple second steel needles 22, and the multiple second steel needles 22 are distributed in a circular array with the first steel needle 21 as the center line; the diameter of the first steel needle 21 is equal to the diameter of the second steel needle 22.

[0039] See also Figure 2 As shown, taking each group of 5 steel needles 2 as an example, when demolding, the first steel needle 21 and the second steel needle 22 corresponding to each group of steel needles 2 form corresponding 5 breakthrough holes 3 on the sound insulation pad 1, wherein the breakthrough hole 3 formed by the first steel needle 21 is located at the center of the 5 breakthrough holes 3, and the other four breakthrough holes 3 formed by the second steel needle 22 are distributed in a circular array with the breakthrough hole 3 formed by the first steel needle 21 as the center line. When the sound insulation pad 1 is installed on the vehicle body 6, one of the 5 breakthrough holes 3 in each group is matched with a corresponding connecting column 4. Such a setting is convenient for assembly and can effectively avoid the inability of the breakthrough hole 3 to match the corresponding connecting column 4 due to tolerance. When matching, the connecting column 4 expands the originally shrunk breakthrough hole so that it can be assembled normally, and the breakthrough hole 3 that is not matched with the connecting column 4 remains in a seam state, which can avoid reducing the NVH performance.

[0040] The wheel cover sound insulation pad provided in the embodiment of the present application is made of elastic material, and a breakthrough hole 3 is provided on the sound insulation pad 1. The breakthrough hole 3 is used to cooperate with the connecting column 4 provided on the vehicle body 6. The diameter of the breakthrough hole 3 is smaller than the diameter of the connecting column 4. The breakthrough hole 3 is formed by the penetration of the steel needle 2, and the breakthrough hole 3 is a slit in the natural state. The diameter of the breakthrough hole 3 is smaller than the diameter of the connecting column 4, and the sound insulation pad 1 is made of elastic material, which provides conditions for the interference fit between the breakthrough hole and the connecting column 4, and can avoid the breakthrough hole 3 from breaking during the interference fit process.

[0041] Every 4-6 breakthrough holes 3 form a group, each group of breakthrough holes 3 corresponds to a connecting column 4, one of the breakthrough holes 3 in each group is located in the middle position, and the remaining breakthrough holes 3 are distributed in a circle around the breakthrough hole 3 in the middle position; during installation, one of the breakthrough holes 3 in each group cooperates with the connecting column 4, see Figure 3 Such arrangement facilitates the installation of the sound insulation pad 1 and avoids the inability of the breakthrough hole 3 to cooperate with the corresponding connecting column 4 due to tolerance.

[0042] The steel needle 2 on the mold of the present application is simpler to manufacture and easier to maintain than the traditional blade. The breakthrough hole 3 and the stud are interference-fitted, and the two form an interference state. The thread can effectively fix the sound insulation pad 1. The sound insulation pad 1 and the stud are tightly matched, which can play a sound insulation role and improve NVH performance. After the thread of the stud fixes the sound insulation pad 1, the buckle can be eliminated, thereby reducing assembly time and reducing parts costs.

[0043] An embodiment of the present application also provides a vehicle, comprising the wheel arch sound insulation pad as described above.

[0044] The above are only preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A method for manufacturing a wheel cover sound insulation pad, characterized in that: The following steps are involved: S1, placing the formed sound insulation pad (1) into the lower mold of the perforation mold, wherein the sound insulation pad (1) is made of elastic material; S2, closing the upper mold (5) provided with a steel needle (2) with the lower mold; the steel needle (2) passes through the sound insulation pad (1) to form a breakthrough hole (3), and the breakthrough hole (3) is used to cooperate with a connecting column (4) provided on the vehicle body (6); S3, after maintaining the pressure for a set time, the upper mold (5) is removed; the steel needle (2) is separated from the sound insulation pad (1), and the breakthrough hole (3) is gradually closed to form a seam under the action of the elastic force of the sound insulation pad (1) itself.

2. The method for manufacturing a wheel arch sound insulation pad according to claim 1, characterized in that: The connecting column (4) is a implant welding stud.

3. The method for manufacturing a wheel arch sound insulation pad according to claim 2, characterized in that: The diameter of the steel needle (2) is smaller than the diameter of the connecting column (4).

4. The method for manufacturing a wheel arch sound insulation pad according to claim 1, characterized in that: There are multiple steel needles (2).

5. The method for manufacturing a wheel arch sound insulation pad according to claim 4, characterized in that: Every 4 to 6 steel needles (2) form a group, and the breakthrough hole (3) formed by each group of steel needles (2) corresponds to one connecting column (4). During installation, one of the breakthrough holes (3) formed by each group of steel needles (2) cooperates with the connecting column (4).

6. The method for manufacturing a wheel house sound insulation pad according to claim 5, characterized in that: Each group of steel needles (2) comprises a first steel needle (21) and a plurality of second steel needles (22), wherein the plurality of second steel needles (22) are distributed in a circular array with the first steel needle (21) as the center line; the diameter of the first steel needle (21) is equal to the diameter of the second steel needle (22).

7. The method for manufacturing a wheel arch sound insulation pad according to claim 1, characterized in that: The thickness of the sound insulation pad (1) is not greater than 10 mm.

8. A wheel cover sound insulation pad, characterized in that: The sound insulation pad (1) is made of elastic material. A breakthrough hole (3) is provided on the sound insulation pad. The breakthrough hole (3) is used to cooperate with a connecting column (4) provided on the vehicle body (6). The diameter of the breakthrough hole (3) is smaller than the diameter of the connecting column (4). The breakthrough hole (3) is formed by penetration of a steel needle (2). The breakthrough hole (3) is a seam in a natural state.

9. The wheel house sound insulation pad according to claim 8, characterized in that: Every 4 to 6 breakthrough holes (3) form a group, and each group of the breakthrough holes (3) corresponds to one connecting post (4). During installation, one of the breakthrough holes (3) in each group cooperates with the connecting post (4).

10. A vehicle, characterized in that: Including the wheel arch sound insulation pad as described in any one of claims 8-9.

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