Inverted injection mold

Abstract

An inverted injection mold comprises a fixed mold plate, a movable mold plate and a hot runner plate, the hot runner plate, the fixed mold plate and the movable mold plate are sequentially arranged from top to bottom, a fixed mold core is arranged on the fixed mold plate, a movable mold core is arranged on the movable mold plate, and a cavity used for forming a product is formed between the fixed mold core and the movable mold core. The hot runner plate is provided with a hot runner penetrating through the fixed mold plate and the fixed mold core, the lower end of the hot runner is provided with a sprue, the sprue extends to the cavity, a sizing material in the hot runner is injected into the cavity through the sprue, the lower surface of the fixed mold core is concavely provided with a buffer groove, the sprue convexly extends into the buffer groove, and the buffer groove is used for preventing the sizing material from being accumulated around the sprue. The buffer groove is provided with a chamfer structure; the inverted injection mold further comprises an ejector plate, the ejector plate is movably arranged between the fixed mold plate and the hot runner plate, an ejection mechanism is arranged on the ejector plate, and the ejector plate can drive the ejection mechanism to do lifting motion; and when the product is formed, the lower surface of the sprue is propped against the center of the upward surface of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an inverted injection mold. Background Art

[0002] With the rapid development of electronic products, the thickness of current electronic products such as mobile phones, tablets, and laptops is getting smaller and smaller, the appearance structure is getting more and more complex, and the requirements for appearance are also getting higher and higher.

[0003] Injection molds generally adopt an outer four-sided slider structure. In this mold structure, the sprue generally turns from the slider to the submarine gate for injection. Because the injection position is restricted, it will cause different injection flow lengths and uneven injection, resulting in defects in the appearance of the product, such as gate marks, etc., and even the dimensional accuracy of the product cannot meet the assembly requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an inverted injection mold to solve the problem of uneven injection that easily occurs in the existing injection molds during injection.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An inverted injection mold includes a fixed template, a moving template, and a hot runner plate. The hot runner plate, the fixed template, and the moving template are arranged in sequence from top to bottom. A fixed mold core is arranged on the fixed template, a moving mold core is arranged on the moving template, and a cavity for forming a product is arranged between the fixed mold core and the moving mold core. The hot runner plate is provided with a hot runner that penetrates the fixed template and the fixed mold core. A nozzle is arranged at the lower end of the hot runner, and the nozzle extends to the cavity. The rubber material in the hot runner is injected into the cavity through the nozzle. A buffer groove is recessed on the lower surface of the fixed mold core, and the nozzle protrudes into the buffer groove. The buffer groove is used to prevent the rubber material from accumulating around the nozzle. The buffer groove is provided with a chamfer structure for guiding the flow of the rubber material; the inverted injection mold further includes an ejector plate. The ejector plate is movably arranged between the fixed template and the hot runner plate. An ejection mechanism is arranged on the ejector plate, and the ejector plate can drive the ejection mechanism to move up and down. The ejection mechanism is used to eject the product during demolding; when the product is formed, the lower surface of the nozzle abuts against the center of the upward-facing surface of the product.

[0007] Further, the lower surface of the nozzle and the lower surface of the fixed mold core are on the same plane.

[0008] Further, the cross-section of the buffer groove is in a trumpet shape and expands outward in the direction of the cavity.

[0009] Further, the maximum length of the lower opening of the buffer groove is 1.10 mm to 1.25 mm.

[0010] Further, the chamfer structure is a rounded corner, and the radius of the rounded corner is 0.45 mm to 0.55 mm.

[0011] Further, the chamfer structure is an oblique angle, and the angle between the chamfer structure and the horizontal plane is an inclination angle, and the magnitude of the inclination angle is 30° to 35°.

[0012] Further, the hot runner penetrates through the ejector plate and does not interfere with the lifting of the ejector plate.

[0013] Further, the inverted injection mold further includes a lifting device, the lifting device is fixed on both sides of the fixed mold plate, the movable end of the lifting device is connected to the ejector plate, and the lifting device drives the ejector plate to perform lifting movement.

[0014] Further, the lifting device is a hydraulic cylinder.

[0015] Further, the inverted injection mold further includes a movable mold plate fixing plate, and the movable mold plate fixing plate is installed below the movable mold plate.

[0016] The beneficial effects of the inverted injection mold of the present utility model: By extending the nozzle into the cavity for injecting glue, the glue is directly injected into the cavity from the nozzle, avoiding the opening of the glue injection runner on the fixed mold core, reducing the waste of glue and preventing the molten glue from cooling down before entering the cavity, making it easier to control the quality of the product; By injecting the glue into the center of the inner surface of the product through the nozzle, on the one hand, the glue injection is more uniform, and on the other hand, it does not affect the aesthetics of the appearance surface of the product, achieving better quality of the molded product; Since the product is relatively thin, the glue is easily accumulated under the nozzle. Through the cooperation of the buffer groove and the chamfer structure, it prevents the glue from accumulating around the lower part of the nozzle and makes the glue injection more uniform, achieving better quality of the molded product. The inverted injection mold not only reduces the waste of glue and lowers the production cost, but also has uniform glue injection and improves the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the inverted injection mold of Embodiment 1 of the present utility model.

[0018] Figure 2 is Figure 1 The enlarged cross-sectional view at A in.

[0019] Figure 3 is Figure 1 The partial schematic view of the fixed mold core shown.

[0020] Figure 4 It is the partial schematic view of the fixed mold core of the inverted injection mold of Embodiment 2 of the present utility model.

[0021] Figure 5 is Figure 4 The schematic view of the chamfer structure shown. Detailed implementation manners

[0022] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0023] The terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. in the description and claims of the present utility model indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of clearly expressing the technical solution and description, and therefore cannot be construed as a limitation to the present application.

[0024] Embodiment 1:

[0025] Please refer to Figure 1 and Figure 2 , an inverted injection mold, including a fixed template 20, a movable template 30 and a hot runner plate 10. The hot runner plate 10, the fixed template 20, and the movable template 30 are arranged in sequence from top to bottom; a fixed mold core 21 is arranged on the fixed template 20, a movable mold core 31 is arranged on the movable template 30, and a cavity 100 for molding a product is arranged between the fixed mold core 21 and the movable mold core 31.

[0026] The hot runner plate 10 is provided with a hot runner 11 that penetrates the fixed template 20 and the fixed mold core 21. A nozzle 12 is arranged at the lower end of the hot runner 11, and the nozzle 12 extends to the cavity 100. The rubber material in the hot runner 11 is injected into the cavity 100 through the nozzle 12.

[0027] Since the product molded by the present utility model is relatively thin, the rubber material is likely to accumulate around the nozzle 12. Therefore, a buffer groove 211 is recessed on the lower surface of the fixed mold core 21. The nozzle 12 protrudes into the buffer groove 211. The buffer groove 211 is used to prevent the rubber material from accumulating around the nozzle 12. The buffer groove 211 is provided with a chamfer structure 212 for guiding the flow of the rubber material. When the product is molded, the side of the product facing down is the appearance surface, and the side of the product facing up is the inner surface of the product. The lower surface of the nozzle 12 abuts against the center of the inner surface of the product.

[0028] The inverted injection mold further includes an ejector plate 40. The ejector plate 40 is movably arranged between the fixed template 20 and the hot runner plate 10. An ejection mechanism 41 is arranged on the ejector plate 40. The ejector plate 40 can drive the ejection mechanism 41 to move up and down. The ejection mechanism 41 is used to eject the product during demolding.

[0029] More specifically, the hot runner 11 penetrates through the ejector plate 40 without interfering with the lifting of the ejector plate 40.

[0030] As described above, for the inverted injection mold proposed by the present invention, by protruding the nozzle 12 into the cavity 100 for injecting glue, the glue is directly injected into the cavity 100 from the nozzle 12, avoiding the opening of a glue injection runner on the fixed mold core 21, reducing the waste of glue and preventing the molten glue from cooling down before entering the cavity 100, making it easier to control the quality of the product; by injecting glue into the center of the inner surface of the product through the nozzle 12, on the one hand, the glue injection is more uniform, and on the other hand, it does not affect the aesthetics of the outer surface of the product, achieving better quality of the molded product; since the product is relatively thin, the glue is easily accumulated under the nozzle 12. Through the cooperation of the buffer groove 211 and the chamfer structure 212, it prevents the glue from accumulating around the lower part of the nozzle 12 and makes the glue injection more uniform, achieving better quality of the molded product. The inverted injection mold not only reduces the waste of glue, lowers the production cost, but also has uniform glue injection and improves the product yield.

[0031] Please refer to Figure 2 , the lower surface of the nozzle 12 is on the same plane as the lower surface of the fixed mold core 21. When the product is molded, the lower surface of the nozzle 12 abuts against the inner surface of the product, preventing the nozzle 12 from invading the interior of the product and thus affecting the quality of the product.

[0032] The cross-section of the buffer groove 211 is in a trumpet shape and expands outward in the direction of the cavity 100. Such a setting can prevent the glue entering the cavity 100 from accumulating around the nozzle 12 and at the same time guide the glue to flow towards the periphery of the cavity 100.

[0033] Furthermore, the maximum length L of the lower end opening of the buffer groove 211 is 1.10 mm to 1.25 mm. It can be understood that the larger the maximum length L, the more glue the buffer groove 211 can accommodate, and the more conducive it is to preventing the glue from accumulating around the nozzle 12. However, if the maximum length L is too large, it will affect the original design of the product and thus affect the molding quality of the product. After multiple tests, when the maximum length L is within the range of 1.00 mm to 1.40 mm, it can be compatible with the effect of preventing glue accumulation and the product quality. Preferably, the maximum length L is 1.10 mm to 1.25 mm. Those skilled in the art can specifically set the maximum length L to 1.10 mm, 1.15 mm, 1.20 mm, 1.25 mm, etc., and it is not uniquely limited here.

[0034] Please refer to Figure 3, the shape of the buffer groove 211 can be specifically designed according to the shape of the product. In this embodiment, the buffer groove 211 is flat. The buffer groove 211 can make the rubber material flow in the expanding direction of the buffer groove 211, achieving uniform rubber feeding.

[0035] Please refer to Figure 2 , the chamfer structure 212 is a rounded corner, and the radius R of the rounded corner is 0.45 mm to 0.55 mm. It can be understood that if the radius R is too large, the guiding effect of the chamfer structure 212 on the rubber material will be weakened; if the radius R is too small, the amount of rubber material that the buffer groove 211 can accommodate will be reduced, thereby weakening the effect of preventing rubber material accumulation. After multiple tests, when the radius R is within the range of 0.30 mm to 0.65 mm, the guiding effect and the effect of preventing rubber material accumulation can be compatible. Preferably, the radius R is 0.45 mm to 0.55 mm. Those skilled in the art can specifically set the radius R to 0.450 mm, 0.475 mm, 0.500 mm, 0.525 mm, 0.550 mm, etc., which is not uniquely limited here.

[0036] Please refer to Figure 1 , the inverted injection mold further includes a lifting device 50. The lifting device 50 is fixed on both sides of the fixed template 20. The movable end of the lifting device 50 is connected to the ejector plate 40, and the lifting device 50 drives the ejector plate 40 to move up and down. In this embodiment, the lifting device 50 is a hydraulic cylinder.

[0037] The inverted injection mold further includes a movable template fixing plate 60. The movable template fixing plate 60 is installed below the movable template 30.

[0038] Embodiment 2:

[0039] An inverted injection mold has a structure similar to that of the inverted injection mold in Embodiment 1, and the difference lies in:

[0040] Please refer to Figure 4 , in this embodiment, the buffer groove 211 is conical. The buffer groove 211 can make the rubber material flow in the expanding direction of the buffer groove 211, achieving uniform rubber feeding.

[0041] Please refer to Figure 5, the chamfer structure 212 is an oblique angle, the included angle between the chamfer structure 212 and the horizontal plane is the inclination angle α, and the size of the inclination angle α is 30° to 35°. It can be understood that if the inclination angle α is too large, the amount of rubber compound that the buffer groove 211 can accommodate will be reduced, thereby weakening the effect of preventing the rubber compound from accumulating; if the inclination angle α is too small, the guiding effect of the chamfer structure 212 on the rubber compound will be weakened. After many tests, when the inclination angle α is within the range of 20° to 45°, the guiding effect and the effect of preventing the rubber compound from accumulating can be compatible. Preferably, the size of the inclination angle α is 30° to 35°. Those skilled in the art can specifically set the size of the inclination angle α to 30°, 31°, 32°, 33°, 34°, 35°, etc., which is not uniquely limited here.

[0042] The beneficial effects of the flip-chip injection mold of the present invention are as follows: The flip-chip injection mold not only reduces the waste of rubber compound and the production cost, but also has uniform rubber injection and improves the product yield.

[0043] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An inverted injection mold, comprising a fixed mold plate, a movable mold plate and a hot runner plate, wherein the hot runner plate, the fixed mold plate and the movable mold plate are arranged in sequence from top to bottom, the fixed mold plate is provided with a fixed mold core, the movable mold plate is provided with a movable mold core, and a cavity for molding a product is provided between the fixed mold core and the movable mold core, characterized in that: The hot runner plate is provided with a hot runner penetrating the fixed mold plate and the fixed mold core, a nozzle is provided at the lower end of the hot runner, the nozzle extends to the mold cavity, the rubber in the hot runner is injected into the mold cavity through the nozzle, a buffer groove is concavely provided on the lower surface of the fixed mold core, the nozzle protrudes into the buffer groove, the buffer groove is used to prevent the rubber from accumulating around the nozzle, and the buffer groove is provided with a chamfer structure, and the chamfer structure is used to guide the flow of the rubber; The flip-chip injection mold further includes an ejector plate, which is movably disposed between the fixed mold plate and the hot runner plate, and an ejector mechanism is disposed on the ejector plate, and the ejector plate can drive the ejector mechanism to perform lifting movement, and the ejector mechanism is used to eject the product during demolding; When the product is formed, the lower surface of the nozzle abuts against the center of the upward side of the product.

2. The inverted injection mold according to claim 1, characterized in that: The lower surface of the nozzle is in the same plane as the lower surface of the fixed mold core.

3. The flip-chip injection mold according to claim 1, characterized in that: The cross section of the buffer groove is trumpet-shaped and expands outwards toward the cavity.

4. The inverted injection mold according to claim 3, characterized in that: The maximum length of the lower opening of the buffer groove is 1.10 mm to 1.25 mm.

5. The flip-chip injection mold according to claim 1, characterized in that: The chamfered structure is a rounded corner, and the radius of the rounded corner is 0.45 mm to 0.55 mm.

6. The flip-chip injection mold according to claim 1, characterized in that: The chamfered structure is an oblique angle, and the angle between the chamfered structure and the horizontal plane is an inclined angle, and the magnitude of the inclined angle is 30° to 35°.

7. The flip-chip injection mold according to claim 1, characterized in that: The hot runner passes through the ejector plate and does not interfere with the lifting and lowering of the ejector plate.

8. The flip-chip injection mold according to claim 1, characterized in that: The inverted injection mold further comprises a lifting device, which is fixed on both sides of the fixed mold plate, and the movable end of the lifting device is connected to the ejector plate, and the lifting device drives the ejector plate to perform lifting movement.

9. The flip-chip injection mold according to claim 8, characterized in that: The lifting device is a hydraulic cylinder.

10. The flip-chip injection mold according to claim 1, characterized in that: The inverted injection mold further comprises a movable template fixing plate, and the movable template fixing plate is installed below the movable template.

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