Injection mold

Abstract

The utility model discloses an injection mold which is used for injection molding of a product with a thick wall and comprises a lower mold core and an upper mold core, the lower mold core is provided with a lower mold groove and a lower water gap groove communicated with the lower mold groove, and the upper mold core is provided with an upper mold groove, an upper water gap groove communicated with the upper mold groove and a hot runner communicated with the upper water gap groove and penetrating through the upper mold core. The upper die cavity and the lower die cavity jointly define a die cavity, a product is formed in the die cavity, a lower inclined face is arranged on the groove bottom wall of the lower nozzle groove in an inclined mode towards the lower die cavity, the included angle alpha is formed between the lower inclined face and the upper surface of the lower die core, and the included angle alpha ranges from 40 degrees to 55 degrees. The injection mold disclosed by the utility model can effectively solve the undesirable phenomena of shrinkage and deformation at the pouring gate of a product, bubbles in the product and the like.

Description

Technical Field

[0001] The utility model relates to the field of plastic product injection molding, in particular to an injection mold. Background Art

[0002] Plastic products are increasingly used in people's lives. As the performance requirements of plastic products become higher and higher, in order to ensure their own strength and withstand gravity, the thickness of the plastic products used is becoming thicker and thicker. However, the inside of plastic products cannot be processed by plastic removal. Therefore, plastic products produced by injection molding using existing technology are prone to shrinkage, deformation, and even bubbles inside the product, which greatly reduces the product yield.

[0003] More specifically, the thickness of existing injection-molded plastic products generally does not exceed 4MM, and can be manufactured using existing processes. When the thickness of a plastic product exceeds 4MM, using existing technology will not only result in a long injection molding cycle and high processing costs, but will also easily cause shrinkage, deformation, and bubbles inside the plastic product. In particular, when the thickness of a plastic product exceeds 10MM, it is almost impossible to produce a qualified product using the existing one-shot injection molding process. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an injection mold that can effectively solve the undesirable phenomena such as shrinkage and deformation at the gate of the product and bubbles generated inside the product.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an injection mold for injection molding products with thick walls, including a lower mold core and an upper mold core, the lower mold core is provided with a lower mold groove and a lower water inlet groove connected to the lower mold groove, the upper mold core is provided with an upper mold groove, an upper water inlet groove connected to the upper mold groove, and a hot runner connected to the upper water inlet groove and running through the upper mold core, the upper mold groove and the lower mold groove together form a mold cavity, the product is molded in the mold cavity, the bottom wall of the lower water inlet groove is inclined toward the lower mold groove and is provided with a lower inclined surface, the lower inclined surface is set at an angle α with the upper surface of the lower mold core, and the angle α is 40°~55°.

[0006] Furthermore, an upper inclined surface is provided on the bottom wall of the upper water inlet groove inclined toward the upper die groove, and the upper inclined surface is provided at an angle β with the lower surface of the upper die core, and the angle β is the same as the angle α.

[0007] Furthermore, the lower inclined surface is gradually expanded from the lower water inlet groove to the lower mold groove, and the upper inclined surface is gradually expanded from the upper water inlet groove to the upper mold groove.

[0008] Furthermore, the upper water inlet groove and the lower water inlet groove are connected to each other.

[0009] Furthermore, the upper mold core and the lower mold core are provided with mounting holes for accommodating cooling pipelines, and the cooling pipelines are distributed around the product at intervals.

[0010] Furthermore, a positioning block is convexly provided on the upper surface of the lower die core at the outer side of the lower die groove, and a positioning groove for accommodating the positioning block is concavely provided on the lower surface of the upper die core.

[0011] Furthermore, the lower die core is provided with an ejector hole communicating with the lower water outlet groove, and an ejector is movably arranged in the ejector hole.

[0012] Furthermore, the injection mold also includes an upper mold base and a lower mold base, the upper mold base is provided with an upper mold core groove for installing the upper mold core, the lower mold base is provided with a lower mold core groove for installing the lower mold core, and the upper mold base is penetrated by a glue inlet channel connected to the hot runner.

[0013] Furthermore, a glue feeding groove connected to the glue feeding channel is concavely provided on the upper surface of the upper mold base, and the glue feeding groove is connected to the glue feeding port.

[0014] The injection mold provided by the utility model can effectively solve the undesirable phenomena such as shrinkage and deformation at the gate of the product and bubbles generated inside the product, thereby greatly improving the yield rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a three-dimensional diagram of the injection mold of the utility model.

[0017] Figure 2 for Figure 1 A top view of the injection mold is shown.

[0018] Figure 3 for Figure 2 The cross-section of the injection mold along the AA plane is shown.

[0019] Figure 4 for Figure 3 A partial enlarged view of point B of the injection mold shown.

[0020] Figure 5It is a three-dimensional diagram of the mold base of the injection mold of the utility model.

[0021] Figure 6 for Figure 5 A perspective exploded view of the mold base is shown.

[0022] Figure 7 for Figure 6 A partial enlarged view of location C of the mold base is shown.

[0023] Figure 8 It is a cross-sectional view of the lower die base of the utility model along the AA plane.

[0024] Fig. 9 for Figure 8 The cross-sectional view of the lower die base along the AA plane is shown.

[0025] Fig.10 for Fig. 9 A partial enlarged view of point D of the lower die base is shown.

[0026] Fig.11 It is a top view of the lower die base of the utility model.

[0027] Fig.12 It is a three-dimensional diagram of the upper die seat of the utility model.

[0028] Fig.13 for Fig.12 A partial enlarged view of location E of the upper die base is shown. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of description and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0031] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0032] See also Figure 1-Figure 13The utility model discloses an injection mold for injection molding a product 100 with a thick wall. The injection mold of the utility model adopts a side gate injection molding method for injection molding. The injection mold includes a lower mold core 30 and an upper mold core 40. When the injection mold is installed on an injection molding machine, the upper mold core 40 is arranged above the lower mold core 30 to realize the opening and closing of the injection mold.

[0033] See also Figure 6 , Figure 8-Figure 13 , the lower mold core 30 is provided with a lower mold groove 31 and a lower water inlet groove 32 connected to the lower mold groove 31. The upper mold core 40 is provided with an upper mold groove 41, an upper water inlet groove 42 connected to the upper mold groove 41, and a hot runner 43 connected to the upper water inlet groove 42 and penetrating the upper mold core 40. In this embodiment, when the lower mold core 30 and the upper mold core 40 are molded together, the upper mold groove 41 and the lower mold groove 31 together form a mold cavity, and the product 100 is molded in the mold cavity. Furthermore, the upper water inlet groove 42 and the lower water inlet groove 32 are connected to each other and together form a water inlet groove, and the water inlet groove is connected to the mold cavity and injected into the mold cavity through the water inlet groove, wherein a part of the water inlet material 200 is injection molded in the hot runner 43, and another part of the water inlet material 200 is injection molded in the water inlet groove. In this embodiment, the connection between the mold cavity and the water gate groove is defined as a gate.

[0034] The bottom wall of the lower water inlet groove 32 is inclined toward the lower die groove 31 and is provided with a lower inclined surface 33, and the lower inclined surface 33 is provided at an angle α with the upper surface of the lower die core 30, and the angle α is 40° to 55°. In this embodiment, by providing the lower inclined surface 33 so that the injection direction is not directly facing the thick wall position, the injection pattern defect at the injection port position is solved, and the qualified rate of the product molding appearance quality is improved.

[0035] More specifically, in this embodiment, when the wall thickness of the product 100 is less than 4 mm, the angle α is set to 55° to complete the injection molding of the product 100; when the wall thickness of the product 100 reaches 4~7 mm, the angle α is set between 50°~55°, preferably, the angle α is set to 50° to complete the injection molding of the product 100; when the wall thickness of the product 100 reaches 8~10 mm, the angle α is set between 45°~50°, preferably, the angle α is set to 45° to complete the injection molding of the product 100; when the wall thickness of the product 100 is greater than 10 mm, the angle α is set to 40° to complete the injection molding of the product 100.

[0036] Furthermore, in this embodiment, the bottom wall of the upper water inlet groove 42 is inclined toward the upper mold groove 41 and has an upper inclined surface, and the upper inclined surface is set at an angle β with the lower surface of the upper mold core, and the angle β is the same as the angle α.

[0037] In other embodiments, the angle β may be different from the angle α, but in order to eliminate the jetting mark defect at the glue inlet position of the product 100, the sum of the angle α and the angle β is 80°~110°.

[0038] See also Fig.11 and Fig.12 The lower inclined surface 33 is gradually expanded from the lower water inlet groove 32 to the lower mold groove 31, and the upper inclined surface is gradually expanded from the upper water inlet groove 42 to the upper mold groove 41. The lower inclined surface 33 and the upper inclined surface are designed in a trumpet shape to allow the product 100 to have a larger injection area during the molding process, and the injection glue can be quickly injected into the mold cavity without easily generating bubbles. The injection glue is squeezed into the mold cavity along the upper inclined surface and the lower inclined surface 33, so that the injection glue entering the mold cavity is more uniform, which can effectively avoid shrinkage, deformation and other problems of the product 100.

[0039] See also Figure 1-Figure 3 , Figure 5-Figure 6 The upper mold core 40 and the lower mold core 30 are provided with a plurality of mounting holes 60 for accommodating cooling pipes 50. The cooling pipes 50 are spaced around the product 100 to cool the injection molded product 100. In this embodiment, water cooling is adopted. The mounting holes 60 are staggered and connected in space and the network covers the four sides of the product 100 to achieve rapid cooling, thereby reducing the production cycle of the product 100 and improving production efficiency.

[0040] See also Figure 8 and Fig.12 The upper surface of the lower mold core 30 is provided with a convex positioning block 35 on the outer side of the lower mold groove 31, and the lower surface of the upper mold core 40 is provided with a concave positioning groove 44 for accommodating the positioning block 35. When the upper mold core 40 and the lower mold core 30 are molded together, the positioning block 35 is positioned in the positioning groove 44.

[0041] See also Figure 8 , Fig. 9 , Fig.11 and Fig.12 The lower mold core 30 is provided with an ejector hole 34 connected to the lower water outlet groove 32, and an ejector is movably arranged in the ejector hole 34. When the injection mold is opened, the ejector ejects the water outlet material 200.

[0042] See also Figure 1-Figure 3 The injection mold further includes an upper mold base 20 and a lower mold base 10. The upper mold base 20 is provided with an upper mold core groove for installing the upper mold core 40, and the lower mold base 10 is provided with a lower mold core groove for installing the lower mold core 30. The upper mold base 20 is provided with a glue inlet channel connected to the hot runner 43. More specifically, the upper surface of the upper mold base 20 is provided with a glue inlet groove connected to the glue inlet channel, and the glue inlet groove is connected to the glue inlet. The lower mold base 10 is provided with an avoidance hole connected to the ejector hole 34, and the ejector is provided through the avoidance hole.

[0043] When the injection mold of the utility model is used,

[0044] When the injection mold changes from the mold opening state to the mold closing state, the upper mold base 20 drives the upper mold core 40 to move toward the lower mold base 10 and the lower mold core 30. At this time, the upper mold groove 41 and the lower mold groove 31 are closed to form the mold cavity, the upper water inlet groove 42 and the lower water inlet groove 32 are closed to form the water inlet groove, the top end surface of the ejector pin is flush with the bottom wall of the lower water inlet groove 32 and blocks the ejector pin hole 34, and then the glue inlet of the injection mold flows through the glue inlet groove to inject glue into the water inlet groove, the glue in the water inlet groove is ejected toward the lower inclined surface 33 and enters the mold cavity through the gate along the lower inclined surface 33 and the upper inclined surface to complete the glue injection action. When the glue injection action is completed, the cooling pipeline cools the mold to cool and form the product 100;

[0045] When the injection mold changes from a closed mold state to an open mold state, the upper mold base 20 drives the upper mold core 40 to move away from the lower mold base 10 and the lower mold core 30, and the ejector moves upward along the ejector hole 34, eventually ejecting the sprue material 200 and the associated product 100, thereby completing the demolding of the product 100.

[0046] The injection mold provided by the utility model can effectively solve the undesirable phenomena such as shrinkage and deformation at the gate of the product and bubbles generated inside the product, thereby greatly improving the yield rate of the product.

[0047] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An injection mold for injection molding a product with a thick wall, characterized in that: The invention comprises a lower die core and an upper die core, wherein the lower die core is provided with a lower die groove and a lower water inlet groove connected with the lower die groove, and the upper die core is provided with an upper die groove, an upper water inlet groove connected with the upper die groove, and a hot runner connected with the upper water inlet groove and penetrating the upper die core, the upper die groove and the lower die groove together form a die cavity, the product is formed in the die cavity, the bottom wall of the lower water inlet groove is inclined toward the lower die groove and is provided with a lower inclined surface, the lower inclined surface is arranged at an angle α with the upper surface of the lower die core, and the angle α is 40° to 55°.

2. The injection mold according to claim 1, characterized in that: The bottom wall of the upper water inlet groove is inclined toward the upper die groove to form an upper inclined surface, and the upper inclined surface is arranged at an angle β with the lower surface of the upper die core, and the angle β is the same as the angle α.

3. The injection mold according to claim 2, characterized in that: The lower inclined surface is gradually expanded from the lower water inlet groove to the lower mold groove, and the upper inclined surface is gradually expanded from the upper water inlet groove to the upper mold groove.

4. The injection mold according to claim 1, characterized in that: The upper water inlet groove and the lower water inlet groove are arranged in communication.

5. The injection mold according to claim 1, characterized in that: The upper die core and the lower die core are provided with mounting holes for accommodating cooling pipelines, and the cooling pipelines are distributed around the product at intervals.

6. The injection mold according to claim 1, characterized in that: A positioning block is convexly provided on the upper surface of the lower die core at the outer side of the lower die groove, and a positioning groove for accommodating the positioning block is concavely provided on the lower surface of the upper die core.

7. The injection mold according to claim 1, characterized in that: The lower die core is provided with an ejector hole which is in communication with the lower water outlet groove, and an ejector is movably arranged in the ejector hole.

8. The injection mold according to any one of claims 1 to 7, characterized in that: The injection mold also includes an upper mold base and a lower mold base, the upper mold base is provided with an upper mold core groove for installing the upper mold core, the lower mold base is provided with a lower mold core groove for installing the lower mold core, and the upper mold base is penetrated by a glue inlet channel connected to the hot runner.

9. The injection mold according to claim 8, characterized in that: The upper surface of the upper mold base is concavely provided with a glue feeding groove connected with the glue feeding channel, and the glue feeding groove is connected with the glue feeding port.

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