Interchangeable inserts without splicing lines: automotive front grille injection mold

Abstract

This utility model provides an injection mold for an interchangeable insert-free automotive front grille, belonging to the field of mold technology. It includes a lower mold plate with two symmetrically arranged lower molding surfaces for forming a molding cavity. A multi-point injection mechanism is located directly above the lower mold plate, and several modular inserts are embedded in the lower mold plate. Bottom injection is achieved through a bottom-feed structure 8 on the modular inserts, reducing the impact of the gate on the product's surface quality. By embedding modular inserts in the lower mold plate and configuring a side ejection component for excess material, the traditional method of manually cleaning side excess material is changed, achieving automatic ejection of side excess material. The multi-point injection mechanism is correspondingly arranged with the modular inserts, working in conjunction with the symmetrical lower molding surfaces to form a molding cavity without insert seams, solving the surface defect problem caused by insert seams in traditional molds. Simultaneously, the modular design supports quick insert replacement, improving mold applicability.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection mold for an interchangeable insert-free automotive front grille. Background Technology

[0002] In the field of automotive front grille injection molding, the efficiency of molds and product quality have always been core issues of concern to the industry. Traditional injection molds often face many technical bottlenecks in the handling of residual material in the runner during the molding process. This is especially true for molds with modular insert designs, where the problem of residual material in the side injection runner is more prominent. Residual material in conventional molds can be directly ejected by ejector pins, but for some molds that use the side of the ejector block for bottom injection, the residual material in the runner on the side of the ejector block cannot be ejected in the above way and needs to be cleaned manually, which is time-consuming and labor-intensive.

[0003] For example, a Chinese patent discloses a side-feeding slider mechanism and mold [application number: 202021534045.4], which includes a slider for molding the side of the product; the slider is provided with a receiving channel, a pouring channel and a gate, and a hot nozzle can extend to the bottom of the receiving channel and communicate with the cavity through the pouring channel and the gate, and there is a gap between the receiving channel and the hot nozzle. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing an injection mold for an interchangeable insert-free automotive front grille.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An injection mold for an interchangeable insert-free automotive front grille includes a lower mold plate. Two lower molding surfaces for forming a molding cavity are symmetrically arranged on the lower mold plate. A multi-point injection mechanism is located directly above the lower mold plate. Several modular inserts are embedded in the lower mold plate. The modular inserts are connected to an ejection mechanism located on the lower side of the lower mold plate. The multi-point injection mechanism includes an injection plate and several injection tubes fixed to the injection plate. The injection tubes correspond to the modular inserts. A bottom-feed structure is provided on the side of each modular insert. An excess material side ejection component is also provided within each modular insert.

[0007] In the above-mentioned interchangeable insert-free automotive front grille injection mold, the bottom injection structure includes a side injection channel, on which an injection port is provided that is connected to the first injection channel at the top of the lower mold plate, and the top of the side injection channel is also provided with several second injection channels that are connected to the lower molding surface.

[0008] In the above-mentioned interchangeable insert-free automotive front grille injection mold, the surplus material side ejection assembly includes a surplus material ejector block embedded in the side of the modular insert. The outer end face of the surplus material ejector block is connected to the side glue inlet channel. The modular insert is also provided with an ejector block mounting groove, and a spring that abuts against the surplus material ejector block is provided in the ejector block mounting groove.

[0009] In the aforementioned interchangeable insert-free automotive front grille injection mold, a limiting rod is also connected to the inner end of the excess material top block, and the limiting rod is slidably connected to the modular insert.

[0010] In the aforementioned interchangeable insert-free automotive front grille injection mold, the inner diameter of the second injection channel gradually decreases from bottom to top.

[0011] In the aforementioned interchangeable insert-free automotive front grille injection mold, the ejection mechanism includes a top plate disposed on the lower side of the lower template and a lifting assembly connected to the top plate. The modular insert is connected to the top plate via two No. 1 straight push rods.

[0012] In the aforementioned injection mold for an interchangeable insert-free automotive front grille, the lifting assembly includes four lifting drivers fixed on the lower template, with the output shaft end of the lifting driver connected to the top plate.

[0013] In the aforementioned injection mold for an interchangeable insert-free automotive front grille, the lower template is also provided with an auxiliary top block structure connected to the top plate.

[0014] In the above-mentioned interchangeable insert-free automotive front grille injection mold, the auxiliary top block structure includes several auxiliary top blocks embedded in the lower template, and the bottom of the auxiliary top block is connected to the top plate through a second straight push rod.

[0015] In the aforementioned injection mold for an interchangeable insert-free automotive front grille, the auxiliary top block structure further includes several residual material ejector rods fixed on the top plate, the top of which is connected to the first glue inlet channel.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: bottom injection can be achieved by setting the bottom injection structure 8 on the modular insert, reducing the impact of the injection port on the surface quality of the product; by embedding the modular insert in the lower mold and configuring the residual material side ejection component, the traditional method of manually cleaning the side residual material of the mold is changed, and the side residual material is automatically ejected; the multi-point injection mechanism is set in correspondence with the modular insert, and with the symmetrical lower molding surface, a molding cavity without insert splicing lines is formed, which solves the surface defect problem caused by the splicing gap of the traditional mold. At the same time, the modular design supports quick replacement of inserts, improving the applicability of the mold.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a structural diagram of the lower template;

[0020] Figure 3 This is a schematic diagram of the ejection mechanism;

[0021] Figure 4 This is a schematic diagram of the modular insert structure;

[0022] Figure 5 This is a cross-sectional view of a modular insert.

[0023] In the diagram, 1 is the lower mold plate, 2 is the lower molding surface, 3 is the multi-point injection molding mechanism, 4 is the modular insert, 5 is the ejection mechanism, 6 is the injection plate, 7 is the injection tube, 8 is the bottom injection structure, 9 is the side ejection assembly for excess material, 10 is the side injection channel, 11 is the first injection channel, 12 is the injection port, 13 is the second injection channel, 14 is the excess material ejector block, 15 is the ejector block mounting groove, 16 is the spring, 17 is the limit rod, 18 is the top plate, 19 is the first straight ejector rod, 20 is the lifting driver, 21 is the auxiliary ejector block, 22 is the second straight ejector rod, and 23 is the excess material ejector rod. Detailed Implementation

[0024] like Figures 1-5 As shown, an injection mold for an interchangeable insert-free automotive front grille includes a lower mold plate 1. Two lower molding surfaces 2 are symmetrically arranged on the lower mold plate 1 to form a molding cavity. A multi-point injection mechanism 3 is arranged directly above the lower mold plate 1. Several modular inserts 4 are embedded in the lower mold plate 1. The modular inserts 4 are connected to an ejection mechanism 5 located on the lower side of the lower mold plate 1. The multi-point injection mechanism 3 includes an injection plate 6 and several injection tubes 7 fixed on the injection plate 6. The injection tubes 7 are correspondingly arranged with the modular inserts 4. A bottom glue inlet structure 8 is provided on the side of each modular insert 4. An excess material side ejection component 9 is also provided inside each modular insert 4.

[0025] In this invention, bottom injection structure 8 set on the modular insert enables bottom injection, reducing the impact of the injection port on the surface quality of the product. By embedding the modular insert in the lower mold and configuring the residual material side ejection component, the traditional method of manually cleaning the side residual material of the mold is changed, and the side residual material is automatically ejected. The multi-point injection mechanism is set in correspondence with the modular insert, and together with the symmetrical lower molding surface, a molding cavity without insert seams is formed, which solves the surface defect problem caused by the insert seams of the traditional mold. At the same time, the modular design supports quick replacement of inserts, improving the applicability of the mold.

[0026] Specifically, the bottom injection structure 8 includes a side injection channel 10, on which an injection port 12 is provided, connected to the first injection channel 11 at the top of the lower template 1. The top of the side injection channel 10 also has several second injection channels 13 connected to the lower molding surface 2. The bottom injection structure, through the through-flow design of the side injection channel, injection port, and second injection channels, constructs a side injection path from the main channel to the molding cavity, allowing molten plastic to uniformly fill the molding cavity from the side of the modular insert. This avoids the filling dead zones of traditional top injection, improves the fullness and structural uniformity of the front grille molding, and reduces the impact of the injection port on the surface quality of the product.

[0027] Specifically, the scrap material side ejection assembly 9 includes a scrap material ejector block 14 embedded in the side of the modular insert 4. The outer end face of the scrap material ejector block 14 is connected to the side glue inlet channel 10. The modular insert 4 also has an ejector block mounting groove 15, and a spring 16 is provided in the ejector block mounting groove 15 to abut against the scrap material ejector block 14. The scrap material side ejection assembly utilizes the linkage between the scrap material ejector block embedded in the side of the insert and the spring. When the ejection mechanism is activated, the spring pushes the ejector block to eject the scrap material in the side glue inlet channel. Automatic demolding of the side scrap material can be achieved without an additional power source, solving the problem of scrap material residue on the side of traditional molds, reducing manual cleaning processes, and improving production efficiency.

[0028] Specifically, a limiting rod 17 is also connected to the inner end of the scrap material top block 14, and the limiting rod 17 is slidably connected to the modular insert 4. The limiting rod at the inner end of the scrap material top block and the modular insert slide together to provide guidance and limit for the movement of the top block, prevent the top block from deviating or detaching during the ejection process, ensure the stability and accuracy of the scrap material ejection action, and avoid scrap material breakage and residue caused by the shaking of the top block.

[0029] Specifically, the inner diameter of the second inlet channel 13 gradually decreases from bottom to top. The design of the inner diameter of the second inlet channel gradually decreasing from bottom to top utilizes the principle of cross-sectional shrinkage to increase the flow pressure of the molten material, so that the molten plastic fills the molding cavity with higher pressure, reducing molding defects such as shrinkage and material shortage. At the same time, the gradually shrinking structure can balance the flow rate of the molten material in the channel, ensuring that all parts of the front grille are filled evenly.

[0030] Specifically, the ejection mechanism 5 includes a top plate 18 disposed on the lower side of the lower template 1 and a lifting assembly connected to the top plate 18. The modular insert 4 is connected to the top plate 18 via two first straight ejector rods 19. The ejection mechanism connects the modular inserts through the top plate and the first straight ejector rods. The lifting assembly drives the top plate to simultaneously eject all inserts, realizing the linkage demolding of the molded part and the inserts. Compared with the traditional decentralized ejection structure, this improves demolding efficiency and stability, and avoids mold damage caused by uneven force on the inserts.

[0031] Preferably, the lifting assembly includes four lifting drivers 20 fixed on the lower template 1, with the output shaft ends of the lifting drivers 20 connected to the top plate 18. The four lifting drivers are evenly distributed to drive the top plate, providing stable ejection power, ensuring that the top plate remains horizontal during lifting, avoiding tilting of the modular inserts, and ensuring the synchronization and reliability of the ejection action. This is suitable for the heavy-duty demolding requirements of large front grille molds.

[0032] Those skilled in the art should understand that the lifting drive can be a hydraulic cylinder, a pneumatic cylinder, or a linear motor, etc.

[0033] Specifically, the lower template 1 is also provided with an auxiliary ejector block structure connected to the top plate 18. The auxiliary ejector block structure is connected to the top plate and assists in ejecting the molded part during demolding, shares the ejection pressure of the modular insert, prevents the front grille from deforming due to excessive local stress, and at the same time, the auxiliary ejector block can fill the support of weak parts of the molded part, thereby improving the demolding quality.

[0034] Specifically, the auxiliary top block structure includes several auxiliary top blocks 21 embedded in the lower template 1. The bottom of each auxiliary top block 21 is connected to the top plate 18 via a second straight ejector rod 22. The auxiliary top blocks are linked to the top plate via the second straight ejector rod, and the molded part is ejected synchronously during demolding. This provides multi-point support, especially for complex structures of the front grille, ensuring uniform stress on all parts of the molded part and reducing demolding deformation. At the same time, the auxiliary top blocks can improve the mold's adaptability to front grilles with different shapes.

[0035] Specifically, the auxiliary top block structure also includes several residual material ejector rods 23 fixed on the top plate 18. The top of each residual material ejector rod 23 is connected to the first injection channel 11. The residual material ejector rods are fixed on the top plate and connected to the first injection channel, simultaneously ejecting the residual material in the main runner during demolding. This achieves simultaneous automatic cleaning of residual material in the main runner and side injection channels, avoiding the cumbersome process of separately handling residual material in the main runner and side runner in traditional molds, and further improving the level of production automation.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this article frequently uses terms such as lower template 1, lower molding surface 2, multi-point injection mechanism 3, modular insert 4, ejection mechanism 5, injection plate 6, injection tube 7, bottom injection structure 8, excess material side ejection assembly 9, side injection channel 10, first injection channel 11, injection port 12, second injection channel 13, excess material ejector block 14, ejector block mounting groove 15, spring 16, limit rod 17, top plate 18, first straight ejector rod 19, lifting driver 20, auxiliary ejector block 21, second straight ejector rod 22, and excess material ejector rod 23, these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. An injection mold for an interchangeable insert-free automotive front grille, comprising a lower template (1), characterized in that, The lower template (1) is symmetrically provided with two lower molding surfaces (2) for forming a molding cavity. A multi-point injection molding mechanism (3) is provided directly above the lower template (1). A number of modular inserts (4) are embedded in the lower template (1). The modular inserts (4) are connected to the ejection mechanism (5) provided on the lower side of the lower template (1). The multi-point injection molding mechanism (3) includes an injection plate (6) and a number of injection tubes (7) fixed on the injection plate (6). The number of injection tubes (7) are correspondingly provided with the number of modular inserts (4). The modular inserts (4) are provided with a bottom glue inlet structure (8) on the side. The modular inserts (4) are also provided with a residual material side ejection component (9). The residual material side ejection assembly (9) includes a residual material top block (14) embedded in the side of the modular insert (4). The outer end face of the residual material top block (14) is connected to the side glue inlet channel (10). The modular insert (4) is also provided with a top block mounting groove (15). A spring (16) that abuts against the residual material top block (14) is provided in the top block mounting groove (15). The inner end of the residual material top block (14) is also connected to a limiting rod (17), and the limiting rod (17) is slidably connected to the modular insert (4).

2. The injection mold for an interchangeable insert-free automotive front grille according to claim 1, characterized in that, The bottom glue inlet structure (8) includes a side glue inlet channel (10), and the side glue inlet channel (10) is provided with a glue inlet (12) connected to the first glue inlet channel (11) at the top of the lower template (1). The top of the side glue inlet channel (10) is also provided with several second glue inlet channels (13) connected to the lower molding surface (2).

3. The injection mold for an interchangeable insert-free automotive front grille according to claim 2, characterized in that, The inner diameter of the second glue inlet channel (13) gradually decreases from bottom to top.

4. The injection mold for an interchangeable insert-free automotive front grille according to claim 3, characterized in that, The ejection mechanism (5) includes a top plate (18) set on the lower side of the lower template (1) and a lifting assembly connected to the top plate (18). The modular insert (4) is connected to the top plate (18) through two No. 1 straight push rods (19).

5. The injection mold for an interchangeable insert-free automotive front grille according to claim 4, characterized in that, The lifting assembly includes four lifting drivers (20) fixed on the lower template (1), and the output shaft ends of the lifting drivers (20) are connected to the top plate (18).

6. The injection mold for an interchangeable insert-free automotive front grille according to claim 5, characterized in that, The lower template (1) is also provided with an auxiliary top block structure connected to the top plate (18).

7. The injection mold for an interchangeable insert-free automotive front grille according to claim 6, characterized in that, The auxiliary top block structure includes several auxiliary top blocks (21) embedded in the lower template (1). The bottom of the auxiliary top block (21) is connected to the top plate (18) through the second straight top rod (22).

8. The injection mold for an interchangeable insert-free automotive front grille according to claim 7, characterized in that, The auxiliary top block structure also includes several residual material push rods (23) fixed on the top plate (18), and the top of the residual material push rods (23) is connected to the first glue inlet channel (11).

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