Headrest injection mold glue feeding structure capable of preventing edge tearing

Abstract

The utility model provides an anti-edge-tearing rubber feeding structure of a headrest injection mold, which comprises an upper mold and a lower mold which can be opened and closed, a lower mold core is arranged in a mold cavity of the lower mold, and a molding cavity of a product is formed; a stepped hole used for mounting a hot nozzle is formed in the upper die, and the stepped hole extends from the end face of the upper die to one side of the forming cavity and penetrates through the end face of the upper die; a hot nozzle pouring gate matched with the hot nozzle is formed in the lower mold core; the ox horn inserts are arranged in the lower mold core in pairs, and an ox horn runner communicating with a hot nozzle sprue is formed in the butt joint face of the two ox horn inserts; a horn gate is formed in one end, deviating from the hot nozzle gate, of the horn runner, is rectangular, extends upwards and protrudes out of the outer surface of the horn insert to form a rectangular bulge; the rectangular horn gate is adopted and located on the central axis of the lower mold core, symmetry of products is kept, the rectangular protrusions are arranged at the gate, stub bars are made to be separated from the products rapidly, and the quality of the forming faces of the products is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile parts production molds, and in particular relates to a glue-feeding structure of a headrest injection mold with an anti-tearing edge. Background Art

[0002] In the injection mold of the automobile headrest, due to the molding requirements of the headrest appearance, the mold usually adopts a bull horn gate design. The bull horn gate is automatically separated from the product after the headrest is injection molded, and has the characteristics of hidden gate and small residue.

[0003] However, the existing headrest molding mold has the following defects in the actual production process: 1. Due to the large appearance size of the headrest, the amount of glue injected by the existing bull horn gate is limited. After the mold pressure test, defects in the product appearance still often appear; 2. The existing bull horn gate is in direct contact with the molding surface of the headrest. After injection molding, when the runner and the product are automatically separated, the material head often pulls the molding surface and deforms it; 3. The material head is not demolded smoothly and is easy to break. Those skilled in the art are in urgent need of solving the above technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a glue-feeding structure of an injection mold for a headrest with a tear-proof edge.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A headrest injection mold injection structure with tear-proof edges, comprising an upper mold and a lower mold that can be opened and closed, a lower mold core is installed in the mold cavity of the lower mold, and a molding cavity of the product is formed between the upper mold and the lower mold core;

[0007] A stepped hole for installing a hot nozzle is provided in the upper die, and the stepped hole extends from the end surface of the upper die toward one side of the molding cavity and penetrates through the molding cavity;

[0008] A hot nozzle gate cooperating with the hot nozzle is provided on the lower mold core;

[0009] Horn inserts are arranged in pairs in the lower mold core, and a horn flow channel connected to a hot nozzle gate is formed on the butt joint surface of the two horn inserts, and the cross-sectional size of the horn flow channel gradually decreases;

[0010] A bull horn gate is formed at one end of the bull horn runner away from the hot nozzle gate, and the bull horn gate is arranged toward the inner wall of the molded product. The bull horn gate is rectangular, and the bull horn gate extends upward and protrudes from the outer surface of the bull horn insert to form a rectangular protrusion, and the rectangular protrusion extends into the inner wall of the molded product and is connected thereto.

[0011] In a preferred embodiment of the utility model, the two horn inserts are spliced ​​in a "convex" shape and placed in the lower mold core, and are locked with the lower mold core by screws.

[0012] In a preferred embodiment of the utility model, a buffer runner is formed at one end of the bull horn runner close to the hot nozzle gate, an arc-shaped protrusion is provided in the buffer runner, and the buffer runner matches the connecting end structure of the hot nozzle gate.

[0013] In a preferred embodiment of the present invention, an ejector pin is vertically arranged in the lower mold core, and the ejector pin can move vertically along the lower mold core and is connected to the hot nozzle gate.

[0014] In a preferred embodiment of the present invention, the position of the rectangular protrusion on the upper surface of the horn insert is the inner molding surface of the product, and the horn insert is located on the central axis of the lower mold core.

[0015] In a preferred embodiment of the present invention, arc corners are arranged around the rectangular protrusion, and the rectangular protrusion smoothly transitions to the upper surface of the horn insert.

[0016] Beneficial effects: The utility model provides a tear-proof edge headrest injection mold glue feeding structure, which adopts a rectangular bull horn gate, which helps the melt to evenly fill the molding cavity and reduce product appearance defects. The bull horn gate extends upward and protrudes from the outer surface of the bull horn insert to form a rectangular protrusion, and the rectangular protrusion forms a groove on the inner molding surface of the product. When the material head is separated from it, the material head is pulled outward along the inner surface of the groove, reducing the contact area between the material head and the product, and quickly separating the material head from the product. At the same time, the design of the rectangular protrusion provides a stable structural support for the separation of the material head and the product.

[0017] The utility model is provided with a buffer flow channel, and an arc-shaped protrusion is provided inside the buffer flow channel to control the flow speed and direction of the melt, reduce the entrapment of air, and help to evenly fill the melt of the bull horn gate; at the same time, the bull horn insert is located on the central axis of the lower mold core, which helps to maintain the symmetry of the product and improve the consistency of appearance and structure;

[0018] The ejector pin of the utility model is arranged at the hot nozzle gate, and the size and structural strength of the material head at the hot nozzle gate are relatively large, thereby reducing the phenomenon of breakage of the material head when it is ejected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a glue-feeding structure of an injection mold for a headrest with tear-proof edges provided by the utility model;

[0020] Figure 2 A partial structural schematic diagram of a glue feeding structure of an injection mold for a headrest with tear-proof edges provided by the utility model;

[0021] Figure 3It is a half-section view of the installation of the lower die core and the horn insert of the utility model;

[0022] Figure 4 For the utility model Figure 3 A local enlarged view of point A;

[0023] Figure 5 It is a structural schematic diagram of the horn insert described in the utility model.

[0024] In the figure: 1 upper die;

[0025] 2 lower die;

[0026] 3 lower mold core, 31 hot nozzle gate;

[0027] 4 hot mouth;

[0028] 5 horn insert, 51 horn runner, 52 horn gate, 53 buffer runner, 54 rectangular protrusion;

[0029] 6 thimbles. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 1-3 As shown, the utility model provides a headrest injection mold glue feeding structure with tear-proof edges, comprising an upper mold 1 and a lower mold 2 that can be opened and closed, a lower mold core 3 is installed in the mold cavity of the lower mold 2, and a molding cavity of the product is formed between the upper mold 1 and the lower mold core 3;

[0032] The upper mold 1 is provided with a stepped hole for installing the hot nozzle 4, and the stepped hole extends from the end surface of the upper mold 1 toward one side of the molding cavity and penetrates through;

[0033] A hot nozzle gate 31 cooperating with the hot nozzle 4 is provided on the lower mold core 3;

[0034] Horn inserts 5 are arranged in pairs in the lower mold core 3; Figure 4-5 As shown, a horn runner 51 connected to the hot nozzle gate 31 is formed on the butt surface of the two horn inserts 5, and the cross-sectional size of the horn runner 51 gradually decreases;

[0035] A bull horn gate 52 is formed at one end of the bull horn runner 51 away from the hot nozzle gate 31. The bull horn gate 52 is arranged toward the inner wall of the molded product. The bull horn gate 52 is rectangular. The bull horn gate 52 extends upward and protrudes from the outer surface of the bull horn insert 5 to form a rectangular protrusion 54. The rectangular protrusion 54 extends into the inner wall of the molded product and is connected thereto.

[0036] The working principle and beneficial effects of the above technical solution are:

[0037] When in use, the melt enters the horn insert 5 from the hot nozzle gate 31, and enters the molding cavity through the horn flow channels 51 in the two horn inserts 5. The upper mold 1 and the lower mold 2 are separated vertically, and the product is molded on the lower mold core 3, wherein the molded product is connected with the material head and each is ejected upward;

[0038] A hot nozzle gate 31 cooperating with the hot nozzle 4 is provided on the lower mold core 3 to ensure that the melt can flow smoothly into the molding cavity. The bull horn inserts 5 are arranged in pairs in the lower mold core 3. A bull horn flow channel 51 is formed on the mating surface of the two bull horn inserts 5. The cross-sectional size of the bull horn flow channel 51 gradually decreases, which helps to control the flow rate and pressure of the melt. The rectangular bull horn gate 52 helps the melt to evenly fill the molding cavity and reduce product appearance defects. The rectangular protrusion 54 is formed on the inner wall of the product, and the separation surface between the material head and the product is formed at the top position of the rectangular protrusion 54. The rectangular protrusion 54 is formed on the surrounding side of the material head. When the product is separated from the material head, the auxiliary material head is quickly separated from the product to reduce the influence of the material head on the product appearance, which improves the structural stability and overall performance of the product.

[0039] In one embodiment, two horn inserts 5 are spliced ​​in a "convex" shape and placed in the lower mold core 3, and are locked with the lower mold core 3 by screws.

[0040] The working principle and beneficial effects of the above technical solution are:

[0041] The horn insert 5 is spliced ​​in a "convex" shape and placed in the lower mold core 3, which simplifies the assembly form of the horn insert 5 and the lower mold core 3, reduces the difficulty of assembling the mold, and at the same time has multiple limit surfaces and high installation accuracy.

[0042] In one embodiment, a buffer channel 53 is formed at one end of the bullhorn channel 51 close to the hot nozzle gate 31, and an arc-shaped protrusion is provided in the buffer channel 53, and the buffer channel 53 matches the connecting end structure of the hot nozzle gate 31;

[0043] The working principle and beneficial effects of the above technical solution are:

[0044] The buffer runner 53 is located at one end of the bull horn runner 51 close to the hot nozzle gate 31, and plays a buffering role on the melt. The arc-shaped protrusion arranged inside the buffer runner 53 further controls the flow speed and direction of the melt, reduces the entrapment of air, and helps to evenly fill the bull horn gate 52 with the melt.

[0045] In one embodiment, an ejector pin 6 is vertically disposed in the lower mold core 3 , and the ejector pin 6 can move vertically along the lower mold core 3 and communicate with the hot nozzle gate 31 .

[0046] The working principle and beneficial effects of the above technical solution are:

[0047] The molded product and the horn head are disconnected from the connection point, and the horn head is ejected outward by the ejector pin 6. The ejector pin 6 is arranged at the hot nozzle gate 31. The head size and structural strength at the hot nozzle gate 31 are relatively large, which reduces the phenomenon of breakage of the head when it is ejected.

[0048] In one embodiment, the position of the upper surface of the horn insert 5 corresponding to the rectangular protrusion 54 is the inner molding surface of the product, and the horn insert 5 is located on the central axis of the lower mold core 3;

[0049] The working principle and beneficial effects of the above technical solution are:

[0050] The rectangular protrusion 54 forms a groove on the inner molding surface of the product. When the material head is separated from it, the material head is pulled outward along the inner surface of the groove, reducing the contact area between the material head and the product, and quickly separating the material head from the product. At the same time, the design of the rectangular protrusion 54 provides a stable structural support for the separation of the material head and the product; the horn insert 5 is located on the central axis of the lower mold core 3, which helps to maintain the symmetry of the product and improve the consistency of appearance and structure.

[0051] In one embodiment, the rectangular protrusion 54 is provided with arc corners around it, and smoothly transitions with the upper surface of the horn insert 5, which is beneficial to product molding and demoulding.

[0052] In summary:

[0053] The utility model adopts a rectangular bull horn gate, which helps the melt to evenly fill the molding cavity and reduce product appearance defects. The bull horn gate extends upward and protrudes from the outer surface of the bull horn insert to form a rectangular protrusion, and the rectangular protrusion forms a groove on the inner molding surface of the product. When the material head is separated from it, the material head is pulled outward along the inner surface of the groove, reducing the contact area between the material head and the product, quickly separating the material head from the product, and preventing the material head from roughening and deforming the molding surface. At the same time, the design of the rectangular protrusion provides a stable structural support for the separation of the material head and the product.

[0054] The utility model is provided with a buffer flow channel, and an arc-shaped protrusion is provided inside the buffer flow channel to control the flow speed and direction of the melt, reduce the entrapment of air, and help to evenly fill the melt of the bull horn gate; at the same time, the bull horn insert is located on the central axis of the lower mold core, which helps to maintain the symmetry of the product and improve the consistency of appearance and structure;

[0055] The ejector pin of the utility model is arranged at the hot nozzle gate, and the size and structural strength of the material head at the hot nozzle gate are relatively large, thereby reducing the phenomenon of breakage of the material head when it is ejected.

[0056] The above shows and describes the basic principle, main features and advantages of the utility model. The front, back, left and right used in the text are not specific, mainly for a more intuitive description of the technical solution, and do not have a limiting effect. The technical personnel in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A headrest injection mold injection structure with tear-proof edges, comprising an upper mold (1) and a lower mold (2) that can be opened and closed, a lower mold core (3) being installed in the mold cavity of the lower mold (2), and a molding cavity for a product being formed between the upper mold (1) and the lower mold core (3); Features: A stepped hole for mounting a hot nozzle (4) is provided in the upper mold (1), and the stepped hole extends from the end surface of the upper mold (1) toward one side of the molding cavity and penetrates through the molding cavity; A hot nozzle gate (31) cooperating with the hot nozzle (4) is provided on the lower mold core (3); Horn inserts (5) are arranged in pairs in the lower mold core (3), and a horn flow channel (51) connected to the hot nozzle gate (31) is formed on the butt joint surface of the two horn inserts (5), and the cross-sectional size of the horn flow channel (51) gradually decreases; A bullhorn gate (52) is formed at one end of the bullhorn runner (51) away from the hot nozzle gate (31), and the bullhorn gate (52) is arranged toward the inner wall of the molded product. The bullhorn gate (52) is rectangular, and the bullhorn gate (52) extends upward and protrudes from the outer surface of the bullhorn insert (5) to form a rectangular protrusion (54), and the rectangular protrusion (54) extends into the inner wall of the molded product and is connected thereto.

2. The headrest injection mold glue feeding structure with tear-proof edge according to claim 1, characterized in that: The two horn inserts (5) are spliced ​​in a "convex" shape and placed in the lower die core (3), and are locked with the lower die core (3) by means of screws.

3. The headrest injection mold glue feeding structure with tear-proof edge according to claim 1, characterized in that: A buffer flow channel (53) is formed at one end of the bullhorn flow channel (51) close to the hot nozzle gate (31), and an arc-shaped protrusion is provided in the buffer flow channel (53). The buffer flow channel (53) matches the connecting end structure of the hot nozzle gate (31).

4. The headrest injection mold glue feeding structure with tear-proof edge according to claim 1, characterized in that: An ejector pin (6) is vertically arranged in the lower mold core (3), and the ejector pin (6) can move vertically along the lower mold core (3) and is connected to the hot nozzle gate (31).

5. The headrest injection mold glue feeding structure with tear-proof edge according to claim 1, characterized in that: The position of the rectangular protrusion (54) on the upper surface of the horn insert (5) is the inner molding surface of the product, and the horn insert (5) is located on the central axis of the lower mold core (3).

6. The headrest injection mold glue feeding structure with tear-proof edge according to claim 1, characterized in that: The rectangular protrusion (54) is provided with arc corners around its periphery and smoothly transitions with the upper surface of the horn insert (5).

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