Mould structure of glue inlet of automobile side decoration plate

Abstract

The utility model relates to a mold structure of a glue inlet of an automobile side decoration plate, and belongs to the technical field of mold design. The injection mold comprises an upper mold, a lower mold and an ejection mechanism, the lower mold is provided with a lower mold core, the lower mold core is provided with a lower mold cavity used for forming the inner surface of the side decoration plate, the lower mold core is further provided with an injection molding channel communicated with an injection molding system, and the bottom wall of the lower mold cavity is provided with a plurality of glue inlets communicated with the injection molding channel. The ejection mechanism is arranged on one side of the lower die and abuts against the inner surface of the side decoration plate. The side decoration plate has the effect of improving the attractiveness of the outer surface of the side decoration plate after injection molding.

Description

Technical Field

[0001] The present application relates to the technical field of mold design, and in particular to a mold structure for a glue inlet of an automobile side trim panel. Background Art

[0002] Automobile side trim is an important component of automobile interior and exterior trim. It mainly covers the side sheet metal of the automobile body. It not only beautifies the appearance, but also protects and covers the body structure, wiring harness, seat belts, etc.

[0003] The production of automotive side trim panels requires the use of injection molds. Traditionally, the upper mold core forms the exterior surface of the side trim panel, while the lower mold core forms the interior. The glue injection holes are typically located within the molding area of ​​the lower mold, aligned with the edge of the side trim panel. Therefore, when ejecting the product from the mold using an ejector pin, noticeable glue injection marks are likely to remain on the outer edge of the product, impacting both product appearance quality and assembly efficiency. Utility Model Content

[0004] In order to improve the aesthetics of the outer surface of the side trim panel after injection molding and improve assembly efficiency, the present application provides a mold structure for a glue inlet of an automobile side trim panel.

[0005] The present application provides a mold structure for a glue inlet of an automobile side trim panel adopting the following technical solution:

[0006] A mold structure for a glue inlet of an automobile side trim panel comprises an upper mold, a lower mold, and an ejection mechanism. The lower mold is provided with a lower mold core, which defines a lower mold cavity for forming the inner surface of the side trim panel. The lower mold core is also provided with an injection channel connected to the nozzle of an injection molding machine. The bottom wall of the lower mold cavity is provided with multiple glue inlets connected to the injection channels. The ejection mechanism is arranged on one side of the lower mold and abuts against the inner surface of the side trim panel.

[0007] By adopting the above technical solution, when the above mold is used to injection mold the automobile side trim, the molten plastic enters the injection channel through the nozzle of the injection molding machine, and then flows from the glue inlet along the injection channel to the lower mold cavity to fill the mold cavity. Since the outlet of the glue inlet is connected to the lower mold cavity, after the plastic cools, the glue injection mark remains on the inner surface of the automobile side trim. In actual use, the aesthetics of the automobile's outer surface is guaranteed. Compared with leaving the side wall of the side trim, the error caused during assembly is reduced, and the assembly efficiency is improved. The ejection mechanism abuts against the inner surface of the side trim, making it difficult to damage the outer surface during demolding.

[0008] Optionally, the injection channel includes a main channel and a branch channel, the main channel is connected to the nozzle and is located below the lower mold cavity, and the branch channels are arranged at intervals along the extension direction of the main channel and extend upward to be connected to the glue inlet.

[0009] By adopting the above technical solution, the distribution composition of the injection channel is disclosed. The main channel is used to connect with the nozzle, and the multiple branch channels extend upward. This can guide the molten plastic to the cavity without increasing excessive flow resistance, which is conducive to uniform filling of the plastic. At the same time, a natural exhaust channel can be formed when the plastic flows, which helps to remove air from the mold cavity.

[0010] Optionally, the lower mold core is disassembled and provided with a connecting insert corresponding to the branch channel, and the connecting insert connects the branch channel and the glue inlet.

[0011] By adopting the above technical solution, the connecting insert is set up to connect the branch channel and the glue inlet, reducing the contact area between the molten plastic and the lower mold core, ensuring the temperature of the plastic during flow. At the same time, the disassembly and assembly setting of the connecting insert makes it easy to remove the connecting insert from the lower mold core to clean the residual plastic inside, instead of directly cleaning the lower mold core.

[0012] Optionally, the connecting insert and the branch channel form a glue inlet channel that faces the glue inlet and slopes downward, and the inner diameter of the glue inlet channel gradually decreases toward the glue inlet.

[0013] By adopting the above technical solution, the glue inlet channel connects the glue inlet and the diversion channel, and the inner diameter of the glue inlet channel gradually decreases, which can increase the shear rate of the molten plastic, thereby generating greater shear heat and significantly enhancing fluidity, which is conducive to the melt entering the glue inlet faster.

[0014] Optionally, a limiting surface for limiting the sliding of the solidified injection molding agent is provided at the opening of the glue feeding channel.

[0015] By adopting the above technical solution, when the plastic cools and the ejection mechanism ejects the product, the setting of the limiting surface can limit the cooled and solidified plastic in the glue feeding channel, thereby preventing the probability of the plastic sliding to the glue feeding port.

[0016] Optionally, the ejection mechanism includes a top plate slidably mounted below the lower mold and a plurality of ejector rod assemblies disposed on the top plate and inserted into the lower mold cavity.

[0017] By adopting the above technical solution, the structural composition of the ejection mechanism is disclosed. The top slide is arranged below the lower mold and is used to install the ejector assembly. When the plastic is injected and cooled, the top plate moves upward, so that the ejector assembly pushes the product out of the inner surface from the bottom wall of the lower mold cavity to demold it, reducing the impact of the ejection mechanism on the outer surface or side wall of the product.

[0018] Optionally, the push rod assembly includes an outer push rod and an inner push rod arranged on both sides along the length direction of the side trim panel, the inner push rod is sealed at the glue inlet, and the inner push rod and the inner wall of the glue inlet form a glue injection groove connected to the glue inlet channel, and the inner diameter of the glue injection groove gradually decreases from bottom to top.

[0019] By adopting the above technical solution, the inner push rod is set at the glue inlet. When the product is pushed out, the connection between the glue inlet and the glue inlet channel is cut off in the vertical direction by the inner push rod, thereby improving the demoulding efficiency of the product.

[0020] Optionally, an inclined surface is provided on the side wall of the glue injection groove away from the glue inlet channel, the bottom wall of the glue injection groove is located below the glue inlet, and the inner push rod is provided with a cutting portion for cutting materials at the bottom of the glue injection groove.

[0021] By adopting the above technical solution, the setting of the inclined surface can reduce the gate cross-sectional area, increase the shear rate of the melt, improve the fluidity of the plastic, make the plastic fill the mold cavity evenly, and improve product quality.

[0022] Optionally, the outer ejector rod and the inner ejector rod are correspondingly arranged on both sides of the lower mold cavity.

[0023] By adopting the above technical solution, the corresponding arrangement of the outer ejector rod and the inner ejector rod provides a lifting force in the same vertical direction during ejection, thereby further improving the cutting efficiency of the cutting part for the plastic in the glue feeding channel.

[0024] Optionally, the lower mold core has two lower mold cavities, and the two lower mold cavities are respectively located on both sides of the extension direction of the main channel.

[0025] By adopting the above technical solution and setting up the two lower mold cavities, the mold structure can form two groups of products at a time, thereby improving production efficiency.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. This application sets the glue inlet in the mold cavity used for molding the inner surface. After the product is molded, it ensures the aesthetics of the car's exterior surface and reduces the impact of errors caused by assembly compared to leaving the side panels and side walls.

[0028] 2. This application connects the runner and the plastic inlet through the setting of the connecting insert. The disassembly setting of the connecting insert makes it easy to remove the connecting insert from the lower mold core to clean the residual plastic inside;

[0029] 3. This application improves the demoulding efficiency of the product by correspondingly setting the inner ejector rod and the glue inlet of the ejection mechanism so that when the product is ejected, the inner ejector rod cuts off the connection between the glue inlet and the glue inlet channel in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 2 It is an exploded schematic diagram of the lower mold core and the pressure strip of the embodiment of the present application.

[0032] Figure 3 It is a structural schematic diagram of the connecting insert and the lower mold core in an embodiment of the present application.

[0033] Figure 4 It is a cross-sectional schematic diagram of the glue inlet channel and glue inlet of an embodiment of the present application.

[0034] Explanation of the accompanying reference numerals: 1. Upper mold; 2. Lower mold; 21. Lower mold core; 211. Lower mold cavity; 212. Molding block; 213. Glue inlet; 214. Glue injection groove; 22. Injection channel; 221. Main channel; 222. Branch channel; 23. Connecting insert; 231. Glue inlet channel; 232. Limiting surface; 24. Pressing strip; 3. Ejection mechanism; 31. Ejector plate; 32. Ejector rod assembly; 321. Outer ejector rod; 322. Inner ejector rod; 3221. Inclined surface; 3222. Bottom inclined surface; 3223. Cutting part; 323. Middle ejector rod; 4. Side trim panel. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-4 This application is described in further detail.

[0036] The embodiment of the present application discloses a mold structure for a glue inlet of an automobile side trim panel.

[0037] Reference Figure 1 and Figure 2 A mold structure for a glue inlet of an automobile side trim panel includes an upper mold 1, a lower mold 2, and an ejection mechanism 3. The lower mold 2 is fixedly mounted with a lower mold core 21, and the upper mold 1 is fixedly mounted with an upper mold core 1 corresponding to the lower mold core 21. The top of the lower mold core 21 has a lower mold cavity 211 for molding the inner surface of the automobile side trim panel 4, and the upper mold core 1 has an upper mold cavity corresponding to the lower mold cavity 211. When the upper mold 1 and the lower mold 2 are closed, the upper mold cavity and the lower mold cavity 211 form a complete mold cavity.

[0038] The lower mold core 21 is generally rectangular, with a molding block 212 integrally positioned on its top. The lower mold cavity 211 is located atop the molding block 212. In this embodiment, the lower mold core 21 has two parallel molding blocks 212 and two lower mold cavities 211, enabling the production of two products in a single injection molding cycle.

[0039] Combine Figure 3, an injection channel 22 connected to the injection molding system is arranged in the middle of the lower mold core 21, and the injection channel 22 includes a main channel 221 and a branch channel 222. The main channel 221 is located in the middle of the injection channel 22 and is arranged along the length direction of the lower mold core 21. The branch channel 222 and the main channel 221 are arranged vertically, and the main channel 221 is provided with a branch channel 222. The two molding blocks 212 are respectively located on both sides of the main channel 221, and the two lower mold cavities 211 are respectively connected to the branch channels 222 on both sides. In this embodiment, two groups of runners 222 are arranged on both sides of the main channel 221. The lower mold core 21 also has a pressure strip 24 that seals and covers the top plate of the injection channel 22.

[0040] Reference Figure 3 and Figure 4 The bottom wall of the lower mold cavity 211 is provided with a glue inlet 213 corresponding to the diverter channel 222. The diverter channel 222 extends upward along the side wall of the molding block 212 to the top of the molding block 212. A connecting insert 23 for connecting the glue inlet 213 and the diverter channel 222 is installed on the molding block 212. The top surface of the connecting insert 23 is flush with the bottom wall of the lower mold cavity 211. The connecting insert 23 has a through hole penetrating the side wall, and the through hole and the end of the diverter channel 222 form a glue inlet channel 231. The connecting block is detachably installed on the molding block 212, so that the production personnel can remove the connecting insert 23 from the molding block 212, which is convenient for cleaning the solidified material head remaining in the glue inlet channel 231 and improving production efficiency.

[0041] The cross-section of the glue inlet channel 231 is circular and inclined downward toward the glue inlet 213. The inner diameter of the glue inlet channel 231 gradually decreases from the branch channel 222 to the glue inlet 213 to increase the shear rate of the molten plastic and improve its fluidity. The connecting insert 23 also has a limiting surface 232 at the outlet of the glue inlet channel 231. The limiting surface 232 is perpendicular to the axis of the glue inlet channel 231 to prevent the cooled and solidified plastic in the glue inlet channel 231 from sliding directly into the glue inlet 213.

[0042] The ejection mechanism 3 is integrally mounted below the lower die 2 and includes a top plate 31 and a push rod assembly 32 vertically fixed to the top plate 31. The top plate 31 is slidably mounted below the lower die 2 via a lifting assembly. The lifting assembly can be a hydraulic lift as known in the art.

[0043] The ejector assembly 32 includes an outer ejector 321 and an inner ejector 322, which are positioned on either side of the length of the vehicle's side trim 4. In this embodiment, the ejector mechanism 3 comprises two sets of ejector assemblies 32, spaced apart along the length of the side trim 4. The outer ejector 321 and inner ejector 322 of each set of ejector assemblies 32 are positioned in correspondence with each other. Multiple intermediate ejector assemblies 323 are positioned between the outer and inner ejector assemblies 321 and 322.

[0044] The outer ejector pin 321 is located on the side of the lower mold cavity 211 away from the injection channel 22, and the inner ejector pin 322 is located on the side of the lower mold cavity 211 close to the injection channel 22. The tops of the inner ejector pin 322 and the outer ejector pin 321 both pass through the bottom wall of the lower mold cavity 211 and serve as part of the lower mold cavity 211.

[0045] The inner ejector pin 322 is sealed and inserted into the glue inlet 213. The inner ejector pin 322 has an inclined surface 3221 on the side facing the glue inlet passage 231. The inclined surface 3221 and the inner wall of the glue inlet 213 form a glue injection groove 214, which has a rectangular horizontal cross-section. Molten plastic flows along the glue inlet passage 231 into the glue injection groove 214 and then upward into the lower mold cavity 211. The inclined surface 3221 gradually slopes from bottom to top toward the insert 23, gradually reducing the horizontal area of ​​the glue injection groove 214. This improves the fluidity of the molten plastic and enhances mold filling efficiency.

[0046] The bottom of the inclined surface 3221 has a bottom inclined surface 3222 that extends obliquely below the glue inlet channel 231. To improve the demolding efficiency of the ejection mechanism 3, the inner ejector 322 is further provided with a cutting portion 3223 on the bottom inclined surface 3222. The cutting portion 3223 is in contact with the side wall connecting the glue inlet 213 and the glue inlet channel 231.

[0047] The implementation principle of the mold structure of the glue inlet of the automobile side trim panel in an embodiment of the present application is as follows: the upper mold 1 and the lower mold 2 are closed, the molten plastic enters the main channel 221 from the external injection molding system, and then is diverted from the main channel 221 to the diverter channels 222 on both sides, and rises along the side wall of the molding block 212 to the glue inlet channel 231 under the action of pressure; enters the glue inlet groove along the glue inlet channel 231, and finally flows upward from the glue inlet groove to the mold cavity; after the plastic is cooled and solidified, the upper mold 1 is reset, and the ejection mechanism 3 is started, and the product is ejected from the lower mold cavity 211 by the ejector rod assembly 32, and the material head in the glue inlet groove and the opening of the glue inlet channel 231 are cut off by the cutting part 3223.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A mold structure for a glue inlet of a side trim panel of an automobile, comprising an upper mold (1), a lower mold (2) and an ejection mechanism (3), wherein the lower mold (2) is provided with a lower mold core (21), and the lower mold core (21) is provided with a lower mold cavity (211) for forming the inner surface of the side trim panel (4), characterized in that: The lower mold core (21) is further provided with an injection channel (22) connected to the injection molding system, and the bottom wall of the lower mold cavity (211) is provided with a plurality of glue inlets (213) connected to the injection channel (22). The ejection mechanism (3) is provided on one side of the lower mold (2) and abuts against the inner surface of the side decorative panel (4).

2. The mold structure for the glue inlet of the automobile side trim according to claim 1, characterized in that: The injection channel (22) comprises a main channel (221) and a branch channel (222), wherein the main channel (221) is connected to the nozzle and is located below the lower mold cavity (211), and the branch channel (222) is arranged at intervals along the extension direction of the main channel (221) and extends upward to be connected to the glue inlet (213).

3. The mold structure for the glue inlet of the automobile side trim according to claim 2, characterized in that: The lower mold core (21) has a connecting insert (23) corresponding to the branch channel (222), and the connecting insert (23) connects the branch channel (222) and the glue inlet (213).

4. The mold structure for the glue inlet of the automobile side trim according to claim 3, characterized in that: The connecting insert (23) and the branch channel (222) form a glue inlet channel (231) that is oriented toward the glue inlet (213) and tilted downward, and the inner diameter of the glue inlet channel (231) gradually decreases toward the glue inlet (213).

5. The mold structure for the glue inlet of the automobile side trim according to claim 4, characterized in that: A limiting surface (232) for limiting the sliding of the solidified injection molding agent is provided at the opening of the injection molding channel (231).

6. The mold structure for the glue inlet of the automobile side trim according to claim 5, characterized in that: The ejection mechanism (3) comprises a top plate (31) slidably mounted below the lower mold (2) and a plurality of ejector rod assemblies (32) disposed on the top plate (31) and inserted into the lower mold cavity (211).

7. The mold structure for the glue inlet of the automobile side trim according to claim 6, characterized in that: The ejector assembly (32) comprises an outer ejector (321) and an inner ejector (322) arranged on both sides along the length direction of the side trim (4); the inner ejector (322) is sealed and arranged at the glue inlet (213); and a glue injection groove (214) communicating with the glue inlet channel (231) is formed on the inner wall of the inner ejector (322) and the glue inlet (213); the inner diameter of the glue injection groove (214) gradually decreases from the bottom to the top.

8. The mold structure for the glue inlet of the automobile side trim according to claim 7, characterized in that: An inclined surface (3221) is provided on the side wall of the glue injection groove (214) away from the glue inlet channel (231), the bottom wall of the glue injection groove (214) is located below the glue inlet (213), and the inner push rod (322) is provided with a cutting portion (3223) for cutting materials at the bottom of the glue injection groove (214).

9. The mold structure for the glue inlet of the automobile side trim according to claim 7, characterized in that: The outer ejector rod (321) and the inner ejector rod (322) are correspondingly arranged on both sides of the lower mold cavity (211).

10. The mold structure for the glue inlet of the automobile side trim according to claim 2, characterized in that: The lower mold core (21) has two lower mold cavities (211), and the two lower mold cavities (211) are respectively located on both sides of the extension direction of the main channel (221).

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