Injection mold for air bag cover plate and air bag cover plate

Abstract

The utility model discloses an injection mold for air bag cover plate and air bag cover plate, the injection mold comprises an upper mold and a lower mold, the upper mold and the lower mold are closed to form an injection molding space, the interior of the injection molding space is used for injection molding to form the air bag cover plate, the upper mold comprises a first convex rib, and the lower mold comprises a second convex rib. The first convex rib is arranged on the side, facing the lower die, of the upper die in the trend of an air bag cover plate tearing line. The lower die comprises a second convex rib, and the second convex rib is arranged on the side, facing the upper die, of the lower die in the trend of the airbag cover plate tearing line; and after the upper mold and the lower mold are closed, the first convex rib and the second convex rib are correspondingly arranged up and down, so that the flow and pressure distribution of an injection molding material are controlled during injection molding. The first convex ribs and the second convex ribs control flowing and pressure distribution of injection molding materials during injection molding, the surface of the formed air bag cover plate can be smoother, and the problem that in the prior art, the surface of the air bag cover plate is uneven after a tearing line / weakening line is formed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile safety airbags, in particular to an injection mold for an airbag cover and the airbag cover. Background Art

[0002] The airbag cover is installed between the driver's seat and the passenger seat of the car. Its main function is to enable the airbag to be fully deployed quickly and evenly when it is inflated to form a stable barrier surface.

[0003] The outer layer of the existing airbag cover is provided with a covering piece, and a visible weakening line / tear line is provided on the plastic cover so that the airbag can be deployed from the airbag cover when the car collides. After the weakening line / tear line is provided, it will be covered by the outer leather and become invisible. However, the tearing line / weakening line in the existing airbag cover is limited by the process, such as the stress caused by the flow of materials during the injection molding process, so that the surface of the cover cannot achieve the best flatness, that is, after the airbag cover is covered with leather, the convex marks of the weakening line / tear line of the cover can still be seen on the surface.

[0004] Currently, no effective solution has been proposed for the problem that the surface of the airbag cover is uneven after the tear line / weakened line is formed in the prior art. Utility Model Content

[0005] In view of this, an embodiment of the utility model provides an injection mold for an airbag cover and an airbag cover, so as to at least solve the problem of uneven surface of the airbag cover after the tear line / weakened line is formed in the prior art.

[0006] The utility model embodiment provides the following technical solutions:

[0007] The present invention provides an injection mold for an airbag cover, comprising an upper mold and a lower mold. The upper mold and the lower mold are combined to form an injection space, and the injection space is used for injection molding to form the airbag cover. The upper mold comprises:

[0008] a first convex rib, the first convex rib being arranged on a side of the upper mold facing the lower mold along the direction of the tear line of the airbag cover;

[0009] The lower die comprises:

[0010] A second convex rib, the second convex rib being arranged on a side of the lower mold facing the upper mold along the direction of the tear line of the airbag cover;

[0011] Wherein, after the upper mold and the lower mold are closed, the first convex rib and the second convex rib are arranged correspondingly up and down, and the first convex rib and the second convex rib are used to control the flow and pressure distribution of the injection material during injection molding.

[0012] Furthermore, the width of the first convex rib gradually decreases / increases from an end close to the upper mold to an end away from the upper mold.

[0013] Further, the first convex rib includes a plurality of first sub-convex ribs, and the plurality of first sub-convex ribs are arranged at intervals along the tear line of the airbag cover on a side of the upper mold facing the lower mold;

[0014] The second convex rib includes a plurality of second sub-convex ribs, and the plurality of second sub-convex ribs are arranged at intervals along the tear line of the airbag cover on a side of the lower mold facing the upper mold.

[0015] Furthermore, the upper mold further comprises:

[0016] At least one first through-slot interval, wherein the at least one first through-slot interval is formed between the plurality of first sub-ribs;

[0017] Furthermore, the lower mold further comprises:

[0018] At least one second through-slot interval, wherein the at least one second through-slot interval is formed between the plurality of second sub-ribs;

[0019] At least one through-groove convex rib, the at least one through-groove convex rib being arranged on a side of the lower die facing the upper die and located in a corresponding interval of the second through-groove;

[0020] Wherein, after the upper die and the lower die are clamped, each of the through-slot ribs is inserted into the corresponding first through-slot interval.

[0021] Further, a height of the first convex rib in a direction perpendicular to the upper mold is smaller than a height of the second convex rib in a direction perpendicular to the lower mold.

[0022] Furthermore, the height of the first convex rib in a direction perpendicular to the upper mold is in the range of 0.1 to 0.5 mm.

[0023] Further, a height of the first convex rib in a direction perpendicular to the upper mold is associated with a width of the first convex rib in a direction parallel to the upper mold.

[0024] An embodiment of the present invention further provides an airbag cover, comprising a cover body formed by injection molding and a tearing portion formed on the cover body, wherein the tearing portion comprises:

[0025] Two recessed parts are formed on both sides of the cover plate body and are arranged along the direction of the tearing part. The two recessed parts are arranged correspondingly up and down, and a connecting bridge is formed between the two recessed parts.

[0026] Furthermore, the recessed portion includes a plurality of sub-recessed portions, and the sub-recessed portions are arranged at intervals along the direction of the tearing portion.

[0027] Furthermore, the airbag cover plate further includes a plurality of through grooves, and the plurality of through grooves are formed between the sub-recessed portions.

[0028] Compared with the prior art, the at least one technical solution adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0029] The utility model discloses an injection mold for an airbag cover plate, wherein a first convex rib is arranged on an upper mold and a second convex rib is arranged on a lower mold, so that when the upper mold and the lower mold are closed, the first convex rib and the second convex rib are arranged correspondingly up and down, so as to control the flow and pressure distribution of the injection material during injection molding, so that the surface of the formed airbag cover plate is smoother, thereby solving the problem of uneven surface of the airbag cover plate after the tear line / weakened line is formed in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of an airbag cover in the prior art;

[0032] Figure 2 This is a schematic diagram of an injection mold for an airbag cover according to an embodiment of the utility model;

[0033] Figure 3 The present invention is an exploded view of an airbag cover and an injection mold according to an embodiment of the present invention.

[0034] 10. upper die; 11. first convex rib; 12. first sub-convex rib; 13. first through groove interval;

[0035] 20. lower die; 21. second convex rib; 22. second sub-convex rib; 23. second through groove interval; 24. through groove convex rib;

[0036] 30. Cover plate body; 31. Recessed portion; 32. Through groove; DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0038] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0039] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0040] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0041] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0042] A Chinese patent with patent number CN207997835U discloses an airbag cover capable of removing tear marks, such as Figure 1 As shown, after the tear marks are formed on the airbag cover disclosed in the above patent document, the surface of the airbag cover is not smooth, which affects the appearance of the airbag cover. In severe cases, the airbag cover will not meet the production and use requirements.

[0043] Based on this, this specification embodiment proposes a processing solution: Figure 2As shown, the utility model is an injection mold for an airbag cover, by setting a first convex rib 11 and a second convex rib 21 on the upper mold 10 and the lower mold 20 of the injection mold, so that after the upper mold 10 and the lower mold 20 are molded, the first convex rib 11 and the second convex rib 21 correspond to each other up and down, so that the obtained airbag cover forms a two-way depression inside and outside. The injection mold of the utility model can adjust the flow and pressure distribution of the injection material to change the stress caused by the flow of the injection material, so that the surface of the cover achieves good flatness.

[0044] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0045] Example 1

[0046] like Figures 2-3 As shown, an injection mold for an airbag cover provided by an embodiment of the utility model includes an upper mold 10 and a lower mold 20. The upper mold 10 and the lower mold 20 are molded together to form an injection space, and the injection space is used for injection molding to form the airbag cover. The upper mold 10 includes a first convex rib 11, and the first convex rib 11 is arranged on a side of the upper mold 10 toward the lower mold 20 along the direction of the tear line of the airbag cover.

[0047] The first convex rib 11 is fixedly disposed on a side of the upper mold 10 facing the lower mold 20 , and there is no gap between the first convex rib 11 and the upper mold 10 .

[0048] The lower mold 20 includes a second convex rib 21 , which is arranged on a side of the lower mold 20 facing the upper mold 10 along the tear line of the airbag cover.

[0049] The second convex rib 21 is fixedly disposed on a side of the lower mold 20 facing the upper mold 10 , and there is no gap between the second convex rib 21 and the lower mold 20 .

[0050] In some of the embodiments, the first convex rib 11 and the second convex rib 21 are detachably connected, so that the first convex rib 11 and the second convex rib 21 can be replaced to form tear lines of airbag cover plates of different shapes.

[0051] Among them, after the upper mold 10 and the lower mold 20 are closed, the first convex rib 11 and the second convex rib 21 are correspondingly arranged up and down, and the first convex rib 11 and the second convex rib 21 are used to control the flow and pressure distribution of the injection material during injection molding.

[0052] In the utility model, in the injection space formed after the upper mold 10 and the lower mold 20 are closed, the first rib 11 and the second rib 21 can generate additional pressure, which can help the injection material to fully fill the area where the tear line of the airbag cover is formed, thereby avoiding surface unevenness caused by insufficient filling pressure of the injection material.

[0053] The provision of the first rib 11 and the second rib 21 of the utility model changes the flow direction and flow rate of the injection molding material, making the injection molding material more uniform in the area where the tear line is formed in the airbag cover. This uniform flow helps to reduce the marks or uneven thickness caused by the flow, thereby improving the surface flatness of the airbag cover.

[0054] The utility model provides a first convex rib 11 on the upper die 10 and a second convex rib 21 on the lower die 20, so that the tear line of the formed airbag cover has inner and outer depressions, so that the airbag cover can be accurately cut according to the designed tear line when the airbag cover is used, and the cross section can be smooth without unnecessary burrs.

[0055] Therefore, the utility model can effectively control the flow and pressure distribution of the injection material during the injection molding process by correspondingly arranging the first rib 11 and the second rib 21 on the upper mold 10 and the lower mold 20, thereby ultimately making the surface of the airbag cover plate smoother and more beautiful and highly functional.

[0056] In some of the embodiments, the width of the first rib 11 gradually decreases / increases from one end close to the upper mold 10 to the end away from the upper mold 10, so that the longitudinal section of the tear line portion of the airbag cover facing the upper mold 10 is in the shape of a trapezoid, an inverted trapezoid, a triangle or an inverted triangle.

[0057] Furthermore, the width of the first rib 11 from one end close to the upper mold 10 to one end away from the upper mold 10 remains constant.

[0058] In the actual application process, the width of the first rib 11 from the end close to the upper mold 10 to the end away from the upper mold 10 can be set according to actual needs.

[0059] In some of the embodiments, the width of the second rib 21 gradually decreases / increases from one end close to the lower mold 20 to the end away from the lower mold 20, so that the longitudinal section of the tear line portion of the airbag cover facing the lower mold 20 is in the shape of a trapezoid, an inverted trapezoid, a triangle or an inverted triangle.

[0060] Furthermore, the width of the second rib 21 from one end close to the lower mold 20 to one end away from the lower mold 20 remains constant.

[0061] In the actual application process, the width of the second rib 21 from one end close to the lower mold 20 to one end away from the lower mold 20 can be set according to actual needs.

[0062] In some of the embodiments, the first rib 11 includes a plurality of first sub-ribs 13, which are spaced apart on the side of the upper mold 10 facing the lower mold 20 along the direction of the tear line of the airbag cover; the second rib 21 includes a plurality of second sub-ribs 22, which are spaced apart on the side of the lower mold 20 facing the upper mold 10 along the direction of the tear line of the airbag cover.

[0063] The strength of the tear line in the formed airbag cover can be increased by configuring the first rib 11 to be a plurality of first sub-ribs 13 and configuring the second rib 21 to be a plurality of second sub-ribs 22 .

[0064] For example, when the first rib 11 includes two second sub-ribs 22 and the second rib 21 includes two second sub-ribs 22, the tear line of the airbag cover formed after injection molding has an unthinned / recessed area, so that the strength of the tear line of the airbag cover can be adjusted.

[0065] In some of the embodiments, the upper mold 10 further includes a plurality of first through-slot intervals 13 , and the plurality of first through-slot intervals 13 are formed between the plurality of first sub-ribs 13 .

[0066] The lower mold 20 further includes at least one second through-slot interval 23 and at least one through-slot rib 24. The at least one second through-slot interval 23 is formed between the plurality of second sub-ribs 22; the at least one through-slot rib 24 is disposed on the side of the lower mold 20 facing the upper mold 10 and is located in the corresponding second through-slot interval 23; after the upper mold 10 and the lower mold 20 are closed, each through-slot rib 24 is inserted into the corresponding first through-slot interval 13.

[0067] Among them, Figure 2 As shown, by setting a first through groove interval 13 on the upper mold 10 and setting a second through groove interval 23 and a through groove rib 24 on the lower mold 20, after the upper mold 10 and the lower mold 20 are closed, the airbag cover tear line formed has a through groove 32, so that the strength of the airbag cover tear line can be further adjusted.

[0068] Furthermore, the height of the first convex rib 11 in the direction perpendicular to the upper mold 10 is smaller than the height of the second convex rib 21 in the direction perpendicular to the lower mold 20, so that the depth of the depression of the tear line of the airbag cover toward the upper mold 10 is smaller than the depth of the depression of the tear line of the airbag cover toward the lower mold 20, so that the side of the tear line of the airbag cover toward the upper mold 10 is more easily covered by the covering part, so as to avoid the side of the tear line of the airbag cover toward the upper mold 10 having obvious depression when covered in use.

[0069] Furthermore, the height of the first rib 11 in a direction perpendicular to the upper mold 10 ranges from 0.1 to 0.5 mm.

[0070] Further, the height of the first convex rib 11 in a direction perpendicular to the upper mold 10 is associated with the width of the first convex rib 11 in a direction parallel to the upper mold 10 .

[0071] For example, the height of the first convex rib 11 in a direction perpendicular to the upper mold 10 is arranged in a certain ratio to the width of the first convex rib 11 in a direction parallel to the upper mold 10 .

[0072] More specifically, the height of the first rib 11 in a direction perpendicular to the upper mold 10 is 0.2 mm, and the width of the first rib 11 in a direction parallel to the upper mold 10 is 0.5 mm.

[0073] Example 2

[0074] The embodiment of the utility model also provides an airbag cover, including a cover body 30 formed by injection molding and a tearing portion formed on the cover body 30, the tearing portion includes two recessed portions 31, the two recessed portions 31 are formed on both sides of the cover body 30, and are arranged along the direction of the tearing portion, and the two recessed portions 31 are arranged correspondingly up and down.

[0075] The two recessed portions 31 are both formed by the first convex rib 11 and the second convex rib 21 in Embodiment 1, and their depths are related to the heights of the first convex rib 11 and the second convex rib 21 .

[0076] For example, after the airbag cover is installed, the recessed portion 31 facing the driver's side is formed by the first rib 11 in the upper mold 10 , and the recessed portion 31 facing the airbag side is formed by the second rib 21 in the lower mold 20 .

[0077] For another example, the depth of the recessed portion 31 on the driver's side is smaller than the depth of the recessed portion 31 on the airbag side.

[0078] The depth of the recessed portion 31 facing the airbag side is in the range of 0.1 mm to 0.5 mm.

[0079] The portion between the two recessed portions 31 is a connecting bridge, and the lateral width of the connecting bridge is 10 mm to 25 mm, and the longitudinal width is 0.5 mm to 1.5 mm. The lateral width and longitudinal width of the connecting bridge are related to the lateral width and longitudinal width of the first rib 11 and the second rib 21 in the horizontal direction.

[0080] Further, when the recessed portion 31 includes one sub-recessed portion 31 , the connecting bridge between the two recessed portions 31 is continuously arranged.

[0081] Furthermore, the two recessed portions 31 each include a plurality of sub-recessed portions 31 , and the sub-recessed portions 31 are arranged at intervals along the direction of the tearing portion. In this case, there are a plurality of connecting bridges formed between the two recessed portions 31 , and the connecting bridges are arranged at intervals.

[0082] Specifically, after the airbag cover is installed, the recessed portion 31 facing the driver's side includes a plurality of first sub-recessed portions 31, which are spaced apart along the direction of the tear portion; the recessed portion 31 facing the airbag side includes a plurality of second sub-recessed portions 31, which are spaced apart along the direction of the tear portion.

[0083] Furthermore, the airbag cover further includes at least one through groove 32 , and the at least one through groove 32 is formed between the sub-recessed portions 31 .

[0084] The through groove 32 is formed under the action of the through groove rib 24 in the first embodiment.

[0085] The concave portion of the utility model is not visible after being covered by the covering member, and the glue or thick fabric of the outer covering member can also fill and flatten the outer concave surface.

[0086] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0087] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An injection mold for an airbag cover, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are combined to form an injection molding space, wherein the injection molding space is used for injection molding to form the airbag cover, characterized in that: The upper die comprises: a first convex rib, the first convex rib being arranged on a side of the upper mold facing the lower mold along the direction of the tear line of the airbag cover; The lower die comprises: A second convex rib, the second convex rib being arranged on a side of the lower mold facing the upper mold along the direction of the tear line of the airbag cover; Wherein, after the upper mold and the lower mold are closed, the first convex rib and the second convex rib are arranged correspondingly up and down, and the first convex rib and the second convex rib are used to control the flow and pressure distribution of the injection material during injection molding.

2. The injection mold according to claim 1, characterized in that: The width of the first convex rib gradually decreases / increases from an end close to the upper mold to an end far away from the upper mold.

3. The injection mold according to claim 1, characterized in that: The first convex rib includes a plurality of first sub-convex ribs, and the plurality of first sub-convex ribs are arranged at intervals along the tear line of the airbag cover on a side of the upper mold facing the lower mold; The second convex rib includes a plurality of second sub-convex ribs, and the plurality of second sub-convex ribs are arranged at intervals along the tear line of the airbag cover on a side of the lower mold facing the upper mold.

4. The injection mold according to claim 3, characterized in that: The upper die also includes: At least one first through-slot interval, wherein the at least one first through-slot interval is formed between the plurality of first sub-ribs; The lower die also includes: At least one second through-slot interval, wherein the at least one second through-slot interval is formed between the plurality of second sub-ribs; At least one through-groove convex rib, the at least one through-groove convex rib being arranged on a side of the lower die facing the upper die and located in a corresponding interval of the second through-groove; Wherein, after the upper die and the lower die are clamped, each of the through-slot ribs is inserted into the corresponding first through-slot interval.

5. The injection mold according to claim 1, characterized in that: A height of the first convex rib in a direction perpendicular to the upper mold is smaller than a height of the second convex rib in a direction perpendicular to the lower mold.

6. The injection mold according to claim 1, characterized in that: The height of the first convex rib in a direction perpendicular to the upper mold is in the range of 0.1 to 0.5 mm.

7. The injection mold according to claim 1, characterized in that: The height of the first convex rib in a direction perpendicular to the upper mold is associated with the width of the first convex rib in a direction parallel to the upper mold.

8. An airbag cover, characterized in that: It comprises a cover plate body formed by injection molding using the injection mold according to any one of claims 1 to 7 and a tearing portion formed on the cover plate body, wherein the tearing portion comprises: Two recessed parts are formed on both sides of the cover plate body and are arranged along the direction of the tearing part. The two recessed parts are arranged correspondingly up and down, and a connecting bridge is formed between the two recessed parts.

9. The airbag cover according to claim 8, characterized in that: The recessed portion includes a plurality of sub-recessed portions, and the sub-recessed portions are arranged at intervals along the direction of the tearing portion.

10. The airbag cover according to claim 9, characterized in that: The airbag cover further includes a plurality of through grooves formed between the sub-recessed portions.

Images