Two-color injection mold and two-color molding method for automobile grille

Abstract

The present invention relates to a two-color injection mold and a two-color molding method for an automobile grille, the method comprising: step S1: injecting plastic into a mold cavity through a side gate and a point gate, the mold cavity and a first core cooperate with each other, first molding a transparent layer of a first grille, and then molding a black layer of the first grille; step S2: replacing the first core with a second core; step S3: adjusting the valve needle length of the point gate so that the point gate is adapted to the thickness of the transparent layer of the second grille; step S4: injecting plastic into the mold cavity through the side gate and the point gate, the mold cavity and the second core cooperate with each other, first molding a transparent layer of the second grille, and then molding a black layer of the second grille. The two-color injection mold and the two-color molding method for an automobile grille of the present invention can realize injection molding of the first grille and the second grille by sharing the same mold cavity and hot runner, and only needing to replace the core and adjust the length of the point gate, without using two molds, thereby greatly reducing costs.

Description

Technical Field

[0001] The invention relates to the field of automobile exterior decoration, and more specifically to a two-color injection mold and a two-color molding method for an automobile grille. Background Art

[0002] With the continuous development of science and technology, the intelligence of automobiles is becoming more and more obvious. In the exterior decoration system, the transparency and light transmission of automobile grilles are rising along with the intelligence. If the intelligent effect brought by the light is required, the automobile grille needs to be made into two colors, that is, one side (side A) is transparent and the other side (side B) is black, so as to achieve partial light transmission and partial shielding.

[0003] Due to the different shapes of cars, the shapes of two-color grilles are also different. In the prior art, for two grilles with the same A side and different B sides, two two-color molds need to be used to respectively perform injection molding of the two grilles with different shapes, which results in excessively high costs. Therefore, how to reduce the cost while ensuring the injection molding quality is a technical problem that those skilled in the art need to solve urgently. Summary of the invention

[0004] The object of the present invention is to provide a two-color injection mold and a two-color molding method for an automobile grille, by molding two two-color grilles using a shared cavity and a hot runner, so as to save costs.

[0005] On one hand, the present invention provides a two-color injection mold for an automobile grille, comprising a hot runner and a cavity, and also comprising a first core and a second core that cooperate with the cavity. The hot runner comprises a side gate and a point gate, and a valve needle is provided in the point gate, and the length of the valve needle is adjustable.

[0006] Furthermore, there are 7 side gates and 1 point gate.

[0007] Furthermore, the length adjustment range of the valve needle is 1-2 mm.

[0008] Another aspect of the present invention provides a two-color molding method for an automobile grille, which uses the two-color injection molding device for the automobile grille as described above for injection molding, comprising:

[0009] Step S1: injecting plastic into the mold cavity through the side gate and the point gate, wherein the mold cavity and the first mold core cooperate with each other to first mold the transparent layer of the first grille and then mold the black layer of the first grille;

[0010] Step S2: replacing the first core with the second core;

[0011] Step S3: adjusting the valve needle length of the point gate so that the point gate is adapted to the thickness of the transparent layer of the second grid;

[0012] Step S4: injecting plastic into the cavity through the side gate and the point gate, wherein the cavity and the second core cooperate with each other to first form the transparent layer of the second grid and then form the black layer of the second grid.

[0013] Furthermore, the thickness of the transparent layer of the first grid is 3.5-4 mm.

[0014] Furthermore, the thickness of the transparent layer of the second grid is 2.5-3 mm.

[0015] Furthermore, the thickness of the black layer of the first grid and the black layer of the second grid are both 2-3 mm.

[0016] Furthermore, in step S3, a gasket is provided on the valve needle so as to increase the length of the valve needle.

[0017] Further, the increased valve needle length is 1-2 mm.

[0018] Furthermore, in step S3, the point gate is inserted into the transparent layer surface of the second grid by 0.5-1 mm.

[0019] The two-color injection mold and two-color molding method of the automobile grille provided by the present invention share the same mold cavity and hot runner, and only need to replace the core and adjust the length of the point gate to achieve injection molding of the first grille and the second grille without using two molds, thereby greatly reducing costs and simplifying operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded schematic diagram of a first grid provided by an embodiment of the present invention;

[0021] Figure 2 for Figure 1 AA section view;

[0022] Figure 3 An exploded schematic diagram of a second grid provided by an embodiment of the present invention;

[0023] Figure 4 for Figure 3 BB cross-sectional view;

[0024] Figure 5 A schematic diagram of the structure of a two-color injection mold provided by an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of a transparent layer with a gate;

[0026] Figure 7 A schematic diagram of the structure of a valve needle for a point gate provided in an embodiment of the present invention;

[0027] Figure 8A flow chart of a two-color molding method for an automobile grille provided by another embodiment of the present invention;

[0028] Fig. 9 A schematic diagram of a point gate in which transparent layers of a first grid and a second grid overlap each other according to another embodiment of the present invention;

[0029] Fig.10 A schematic diagram of a side gate in which transparent layers of a first grid and a second grid overlap each other is provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0031] Embodiment 1

[0032] like Figure 1 and Figure 2 As shown, an exploded view of an automobile grille (i.e., the first grille 1) provided in an embodiment of the present invention shows a configuration of the automobile grille, including a transparent layer 11 and a black layer 12, wherein the transparent layer 11 needs to cover the black layer 12, wherein the thickness of the transparent layer 11 is 3.5-4mm, and the thickness of the black layer 12 is 2-3mm.

[0033] like Figure 3 and Figure 4 As shown, an exploded view of another automobile grille (i.e., the second grille 2) provided in an embodiment of the present invention shows another configuration of the automobile grille, including a transparent layer 21 and a black layer 22, wherein the transparent layer 21 needs to cover the black layer 22, wherein the thickness of the transparent layer 21 is 2.5-3mm, and the thickness of the black layer 22 is 2-3mm.

[0034] The transparent layer 11 of the first grid 1 and the transparent layer 21 of the second grid 2 both have a light-transmitting function, and have the same shape and structure, but different thicknesses.

[0035] The black layer 12 of the first grid 1 and the black layer 22 of the second grid 2 are both structural layers, which play a role in blocking light. The outer ring frames of the two are similar, but the overall structures are different. The black layer 22 of the second grid 2 has a sheet structure in the middle.

[0036] like Figure 5As shown, an embodiment of the present invention provides a two-color injection mold for an automobile grille, which is used for injection molding a first grille 1 and a second grille 2, and includes a hot runner (not shown in the figure), a cavity 31, a first core 32 and a second core (not shown in the figure) matched with the cavity 31, wherein the first core 32 matches the black layer 12 of the first grille 1 and is used for injection molding the first grille 1, and the second core matches the black layer 22 of the second grille 2 and is used for injection molding the second grille 2. Plastic is injected into the cavity 31 through the hot runner, and the first core 32 or the second core matches the cavity 31 respectively to mold the first grille 1 or the second grille 2. Figure 6 As shown, the hot runner includes a side gate 33 and a point gate 34. The side gate 33 is located at the edge of the grid product (such as the transparent layer 11 or the transparent layer 12), and the point gate 34 is directly placed on the surface of the grid product to inject plastic into the cavity 3. The side gate 33 can be set to 7, distributed at the edge of the grid product, and the point gate 34 is located in the middle of the grid product. Figure 7 As shown, a valve needle 341 is provided in the point gate 34, and a gasket 342 can be provided on the valve needle 341. By providing the gasket 342, the length of the valve needle 342 can be adjusted, thereby adjusting the length of the point gate 34, wherein the length adjustment range of the valve needle 342 is 1-2 mm.

[0037] The two-color injection mold for the automobile grille provided in the embodiment of the present invention can realize the injection molding of the first grille 1 and the second grille 2 without using two molds by sharing the same cavity and hot runner, thereby greatly reducing the cost, and by setting a point gate 34 with adjustable length, the injection molding quality of the first grille 1 and the second grille 2 can be guaranteed.

[0038] Embodiment 2

[0039] like Figure 8 As shown, another embodiment of the present invention provides a two-color molding method for an automobile grille, which adopts the two-color injection mold for the automobile grille as described in the first embodiment for injection molding, and comprises:

[0040] Step S1: Inject plastic into the mold cavity 31 through the side gate 33 and the point gate 34. The mold cavity 31 and the first core 32 cooperate with each other to first mold the transparent layer 11 of the first grid 1, and then mold the black layer 12 of the first grid 1. The injection molding process includes mold closing, filling, pressure holding, cooling, mold opening, mold closing, etc., which are all common knowledge in the art and will not be repeated here.

[0041] Step S2: Replace the first core 32 with a second core.

[0042] After the first grille 1 is injection molded, the mold cavity 31 and the hot runner do not need to be replaced, and only the second core needs to be replaced to perform the injection molding of the second grille 2. In this way, the injection molding of the first grille 1 and the second grille 2 can be completed without using two molds.

[0043] Step S3 : adjusting the length of the valve needle 341 of the point gate 34 so that the point gate 34 is adapted to the thickness of the transparent layer 21 of the second grid 2 .

[0044] Since the transparent layer 11 of the first grid 1 and the transparent layer 21 of the second grid 2 have different thicknesses, in order to enable the hot runner and the cavity 31 to mold both the first grid 1 and the second grid 2, the length of the point gate 34 needs to be adjusted after molding the first grid 1. Fig. 9 As shown, during injection molding, the point gate 34 needs to penetrate 0.5-1mm into the surface of each grille product. Since the thickness of the transparent layer 21 of the second grille 2 is less than the thickness of the transparent layer 11 of the first grille 1, after the first grille 1 is injection molded, the point gate 34 needs to be lowered by 1-2mm to make it penetrate 0.5-1mm into the transparent layer 21 of the second grille 2 to ensure that the second grille 2 can be smoothly molded. Specifically, the length of the point gate 34 can be changed by adjusting the length of the valve needle 341. For example, a gasket 342 is added to the valve needle 341 to increase the valve needle 341 by 1-2mm, so that the point gate 34 penetrates 0.5-1mm into the surface of the transparent layer 21 of the second grille 2. The plastic is injected into the cavity 31 through the point gate 34 to complete the injection molding.

[0045] like Fig.10 As shown, the transparent layers of the two grilles are put together, and the overlapping schematic diagram of the side gate 33 is that when the transparent layer 11 with a thickness of 3.5-4mm is injected, the side gate overlaps 3.5-4mm, and when the transparent layer with a thickness of 2.5-3mm is injected, the side gate overlaps 2.5-3mm, of which 1-2mm is the non-overlapping part 4. The plastic passes through the side gate 33, flows through the side gate runner 35, and enters the cavity 31, and the injection molding of the first grille 1 or the second grille 2 is completed as required.

[0046] Step S4: Inject plastic into the cavity 31 through the side gate 33 and the point gate 34. The cavity 31 and the second core cooperate with each other to first mold the transparent layer 21 of the first grid 2 and then mold the black layer 22 of the first grid 2.

[0047] After the first grid 1 is injection molded, the second grid 2 can be injection molded by replacing the first core 32 with the second core and adjusting the length of the point gate 34, which is easy to operate and has high injection molding quality.

[0048] The two-color molding method of the automobile grille provided in the embodiment of the present invention can realize the injection molding of the first grille 1 and the second grille 2 by sharing the same cavity 31 and hot runner, only by replacing the core and adjusting the length of the point gate 34, without using two molds, thereby greatly reducing costs and facilitating operation.

[0049] The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above embodiment of the present invention can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the description of the present invention fall within the scope of protection of the claims of the present invention. The contents not described in detail in the present invention are all conventional technical contents.

Claims

1. A two-color injection mold for an automobile grille, comprising a hot runner and a cavity, It is characterized in that The mold further comprises a first core and a second core matched with the cavity, the hot runner comprises a side gate and a point gate, a valve needle is arranged in the point gate, and the length of the valve needle is adjustable; The mold cavity and the first mold core are used to mold a first grille, and the mold cavity and the second mold core are used to mold a second grille, the first grille and the second grille both include a transparent layer and a black layer, and the transparent layer of the first grille and the transparent layer of the second grille have different thicknesses; The length of the point gate is configured to be changed by adjusting the length of the valve pin, so that the hot runner and the cavity can mold the first grid and the second grid.

2. The two-color injection mold for the automobile grille according to claim 1, It is characterized in that There are 7 side gates and 1 point gate.

3. The two-color injection mold for the automobile grille according to claim 1, It is characterized in that The length adjustment range of the valve needle is 1-2 mm.

4. A two-color molding method for an automobile grille, It is characterized in that The double-color injection mold for the automobile grille according to any one of claims 1 to 3 is used for injection molding, comprising: Step S1: injecting plastic into the mold cavity through the side gate and the point gate, wherein the mold cavity and the first core cooperate with each other to first mold the transparent layer of the first grille and then mold the black layer of the first grille; Step S2: replacing the first core with the second core; Step S3: adjusting the valve needle length of the point gate so that the point gate is adapted to the thickness of the transparent layer of the second grid; Step S4: injecting plastic into the cavity through the side gate and the point gate, wherein the cavity and the second core cooperate with each other to first form the transparent layer of the second grid and then form the black layer of the second grid.

5. The two-color molding method of the automobile grille according to claim 4, It is characterized in that The thickness of the transparent layer of the first grid is 3.5-4 mm.

6. The two-color molding method of the automobile grille according to claim 4, It is characterized in that The thickness of the transparent layer of the second grid is 2.5-3 mm.

7. The two-color molding method of the automobile grille according to claim 4, It is characterized in that The thickness of the black layer of the first grid and the black layer of the second grid are both 2-3 mm.

8. The two-color molding method of the automobile grille according to claim 4, It is characterized in that In step S3, a gasket is arranged on the valve needle so as to increase the length of the valve needle.

9. The two-color molding method of the automobile grille according to claim 8, It is characterized in that The increased valve needle length is 1-2 mm.

10. The two-color molding method of the automobile grille according to claim 4, It is characterized in that In step S3, the point gate penetrates into the transparent layer surface of the second grid by 0.5-1 mm.

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