Injection mold with reduced height of the main runner

Abstract

The utility model provides a kind of injection mould of reducing main runner height, including upper die and lower die, upper die and lower die are jointly enclosed to form mould cavity between, the upper die is located sprue bushing on the upper die, and the upper die and the upper of sprue bushing are provided with upper die backing plate, injection molding machine nozzle deferring structure is opened in on the upper die backing plate, main runner is opened inside sprue bushing, injection molding machine nozzle deferring structure is connected in main runner top, and bottom is communicated with mould cavity. The utility model is based on the structure design of existing mould, further shorten the height of main runner in cold runner structure, and reach the purpose of saving cost.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold that reduces the height of the main runner. Background Technology

[0002] In existing injection molding processes, injection molds are mounted on injection molding machines, which inject molten resin raw materials into the molds. The resin raw materials solidify within the mold through cooling channels, forming the target product and cold runner structure. After demolding, the product is retained and delivered to the customer, while the cold runner structure needs to be crushed and recycled for reuse. The number of times resin materials can be recycled is limited, and the resin material used in the cold runner structure is included in the product manufacturing cost; its weight directly affects production costs. The greater the weight of the cold runner structure, the higher the raw material loss, and the higher the product manufacturing cost, resulting in a less competitive product price. Therefore, existing technologies suffer from the problems of large cold runner weight and low material utilization, leading to higher production costs. Furthermore, the diverse thicknesses of existing mold cores result in complex material preparation, increased inventory management difficulty, and a high proportion of capital tied up in material preparation, which is detrimental to production cost control. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an injection mold that reduces the height of the main runner. Based on existing mold structure designs, this invention further shortens the height of the main runner in the cold runner structure, thereby achieving cost savings.

[0004] This utility model provides an injection mold for reducing the height of the main runner, including an upper mold core and a lower mold core, which together enclose a mold cavity. A sprue bushing is placed on the upper mold core, and an upper mold core pad is provided above the upper mold core and the sprue bushing. An injection molding machine nozzle clearance structure is provided on the upper mold core pad. A main runner is provided inside the sprue bushing, with the top of the main runner connected to the injection molding machine nozzle clearance structure and the bottom communicating with the mold cavity.

[0005] In one embodiment, the sprue bushing has a nozzle interface at the top of the main runner, and the nozzle interface is connected to the injection machine nozzle clearance structure on the upper mold core plate.

[0006] In one embodiment, an upper fixing plate is provided above the upper mold core pad.

[0007] In one embodiment, a lower mold core pad is provided below the lower mold core.

[0008] In one embodiment, the upper mold core pad, the upper mold core, the lower mold core, and the lower mold core pad have the same thickness.

[0009] In one embodiment, the sprue bushing is fixed between the upper mold core pad and the upper mold core by a connector.

[0010] In one embodiment, the lower surface of the shoulder of the sprue bushing is flush with the upper surface of the upper mold core.

[0011] In one embodiment, the top of the upper mold core is provided with a mating groove, and the shoulder of the sprue sleeve is at least partially nested in the mating groove.

[0012] The beneficial effects of the injection mold with reduced main runner height provided by this embodiment of the invention are as follows:

[0013] This invention adjusts the installation position of the sprue bushing so that it sits on the upper mold core, and redesigns the thickness of the mold core and the upper mold core backing plate, thereby reducing the total height of the sprue bushing and the height of the main runner, achieving the purpose of reducing the weight of the runner structure, and thus reducing the product manufacturing cost and improving the competitiveness of the product unit price.

[0014] Furthermore, designing the upper mold core, lower mold core, upper mold core backing plate, and lower mold core backing plate to all have the same thickness dimension ensures that there is only one type of mold core material thickness. This reduces the variety of materials and the proportion of capital tied up in material inventory, which is beneficial for cost control in mold manufacturing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A top view of the injection mold provided in an embodiment of this utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the BB cross section in the middle;

[0018] Figure 3 for Figure 2 A magnified view of section C;

[0019] Figure 4 for Figure 1 Schematic diagram of AA section in the middle;

[0020] Figure 5 A schematic diagram of the main runner structure, the branch runner structure, and the three-dimensional structure of the injection molded product provided for embodiments of this utility model;

[0021] Figure 6 A three-dimensional structural diagram of the sprue sleeve provided in an embodiment of this utility model;

[0022] Figure 7 This is a cross-sectional schematic diagram of the prior art.

[0023] Reference numerals: 1-Upper mold core; 2-Lower mold core; 3-Upper mold core backing plate; 4-Lower mold core backing plate; 5-Gating bushing; 6-Injection molding machine nozzle clearance structure; 7-Main runner; 8-Mold cavity; 9-Nozzle interface; 10-Upper fixing plate; 11-Screw mounting hole; 12-Screw mounting hole; 13-Shoulder; 14-Mating groove; 15-Main runner structure; 16-Runner structure; 17-Injection molded product; 18-Machine machine nozzle clearance hole; 19-Runner. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present utility model. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present utility model.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] like Figures 1 to 6 As shown, an injection mold for reducing the height of the main runner includes an upper mold core 1 and a lower mold core 2, which together enclose a mold cavity 8. A sprue bushing 5 is placed on the upper mold core 1, and an upper mold core pad 3 is provided above the upper mold core 1 and the sprue bushing 5. An injection molding machine nozzle clearance structure 6 is provided on the upper mold core pad 3. A main runner 7 is provided inside the sprue bushing 5. The top of the main runner 7 is connected to the injection molding machine nozzle clearance structure 6, and the bottom is connected to the runner 19 and the mold cavity 8.

[0027] The main runner 7 forms an injection channel for conveying molten resin material to the mold cavity 8. After cooling and solidifying within the main runner 7, the molten resin material forms a main runner structure 15 with a shape corresponding to the main runner 7. A branch runner 19, which is in fluid communication with the main runner 7, is provided between the upper mold core 1 and the lower mold core 2 to distribute the molten resin material to each product molding cavity. The end of the branch runner 19 connects to the product molding cavity to form the target injection molded product. The molten resin material cools within the branch runner 19 to form the branch runner structure 16, and solidifies within the product molding cavity to form the injection molded product 17.

[0028] An upper fixing plate 10 is provided above the upper mold core pad 3.

[0029] The sprue sleeve 5 has a nozzle interface 9 at the top of the main runner 7. The nozzle interface 9 is connected to the injection machine nozzle clearance structure 6 on the upper mold core plate 3. In this embodiment, the injection machine nozzle clearance structure 6 is conical, with its small end diameter forming an equal diameter transition fit with the nozzle interface 9, and its large end diameter connecting and transitioning with the machine nozzle clearance hole 18 of the upper fixed plate 10.

[0030] A lower mold core pad 4 is provided below the lower mold core 2. The upper mold core pad 3, upper mold core 1, lower mold core 2 and lower mold core pad 4 have the same thickness.

[0031] The thickness of the upper mold core is between 5mm and 25mm. In this embodiment, the thickness of the upper mold core is 15mm. Therefore, in order to reduce the types of materials and reduce the proportion of funds occupied by material inventory, in this embodiment, the thickness of the upper mold core 1, the lower mold core 2 and the lower mold core pad 4 are all set to 15mm.

[0032] The sprue sleeve 5 is fixed between the upper mold core pad 3 and the upper mold core 1 by a connector. In this embodiment, the connector is a screw. The upper mold core pad 3 has a screw mounting hole 11, and the sprue sleeve 5 has a threaded hole 12 that matches the screw mounting hole 11. The connector passes through the screw mounting hole 11 and the threaded hole 12.

[0033] The shoulder portion 13 of the sprue sleeve 5 is square. In this embodiment, the top of the upper mold core 1 is provided with a mating groove 14, and the shoulder portion 13 of the sprue sleeve 5 is at least partially nested in the mating groove 14. When the shoulder portion 13 of the sprue sleeve 5 is fully nested in the mating groove 14, the upper surface of the shoulder portion 13 of the sprue sleeve 5 is flush with the upper surface of the upper mold core 1.

[0034] This utility model adjusts the installation position of the sprue bushing 5 so that it sits on the upper mold core 1, and redesigns the thickness of the upper mold core 1 and the upper mold core pad 3, reducing the total height of the sprue bushing 5 to 19mm and the height of the main runner 7 to 16mm. Based on the existing mold structure design, the height of the main runner 7 is further shortened, thereby achieving the purpose of reducing the weight of the runner structure.

[0035] In another embodiment of this utility model, the lower surface of the shoulder portion 13 of the sprue bushing 5 is flush with the upper surface of the upper mold core 1.

[0036] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use an injection mold that reduces the height of the main runner according to this utility model, and can produce the positive effects described in this utility model.

[0037] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0038] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An injection mold for reducing the height of the main runner, characterized in that: It includes an upper mold core and a lower mold core, which together enclose a mold cavity. A sprue bushing is placed on the upper mold core. An upper mold core pad is provided above the upper mold core and the sprue bushing. An injection molding machine nozzle clearance structure is provided on the upper mold core pad. A main runner is provided inside the sprue bushing. The top of the main runner is connected to the injection molding machine nozzle clearance structure, and the bottom is connected to the mold cavity.

2. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: The sprue bushing has a nozzle interface at the top of the main runner, and the nozzle interface is connected to the injection machine nozzle clearance structure on the upper mold core plate.

3. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: An upper fixing plate is provided above the upper mold core pad.

4. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: A lower mold core pad is provided below the lower mold core.

5. The injection mold for reducing the height of the main runner according to claim 4, characterized in that: The upper mold core pad, upper mold core, lower mold core, and lower mold core pad are all of the same thickness.

6. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: The sprue bushing is fixed between the upper mold core pad and the upper mold core by a connector.

7. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: The lower surface of the shoulder of the sprue bushing is flush with the upper surface of the upper mold core.

8. The injection mold for reducing the height of the main runner according to claim 1, characterized in that: The top of the upper mold core is provided with a mating groove, and the shoulder of the sprue sleeve is at least partially nested in the mating groove.

Images