A cooling structure for an injection molding mold and a mold including the structure

Abstract

This utility model discloses a cooling structure for an injection molding die and an injection molding die including the cooling structure. The cooling structure includes a main cooling water inlet and outlet, a cooling water inlet and outlet channel connecting the main cooling water inlet and outlet, a connecting channel connecting the cooling water inlet and outlet, and a cooling circuit connecting the connecting channel. The main cooling water inlet and outlet are externally connected to a main cooling water path. At least one side of the cooling circuit has a corrugated structure or a concave-convex structure. This utility model designs at least one side of the cooling circuit as a corrugated structure or a concave-convex structure, so that when the cooling water flows through, the laminar water becomes turbulent water. The cooling effect of turbulent water is higher than that of laminar water, which facilitates further cooling of the movable mold.

Description

Technical Field

[0001] This utility model relates to the field of injection molding mold technology, specifically to a cooling structure for an injection molding mold and a mold including the structure. Background Technology

[0002] The cooling water channels in injection molds are typically created by drilling or boring holes inside the mold inserts using rotary cutting tools such as drill bits or reamers. During injection molding, cooling water flows through these channels to cool the mold.

[0003] Cooling water channels made by cutting can only be straight. Therefore, it is difficult to make complex-shaped cooling water channels in small areas that are prone to high temperatures, such as the air intake grille opening of a movable mold for a car bumper. The water flow in a straight water channel structure is often laminar, resulting in poor cooling effect and easily leading to long injection molding cycle time and low production efficiency.

[0004] Adding cooling water channels using traditional cutting processes would increase the number of steps and thus the cost, and it would be impossible to process every part of the mold.

[0005] Therefore, how to shorten the processing flow of cooling water channels and design and process non-linear water channel structures to improve cooling efficiency and enhance the quality of injection molded products are technical problems that need to be solved in this field. Utility Model Content

[0006] This utility model provides a cooling structure for injection molding molds and a mold containing the structure, to overcome the above-mentioned problems in the prior art: (1) poor cooling effect: the water flow generated by the straight water channel structure is laminar flow, and the cooling effect is poor. (2) design and processing of non-straight water channel structure: traditional cutting processing cannot manufacture water channel structures with complex shapes such as non-straight lines.

[0007] Regarding the cooling structure of injection molding molds, the technical solution of this application is as follows:

[0008] The cooling structure of the injection molding mold includes a main cooling water inlet and outlet, a cooling water inlet and outlet channel connecting the main cooling water inlet and outlet, a connecting channel connecting the cooling water inlet and outlet channels, and a cooling circuit connecting the connecting channel. The main cooling water inlet and outlet are externally connected to the main cooling water path. At least one side of the cooling circuit has a corrugated or convex / concave structure. Designing at least one side of the cooling circuit as a corrugated or convex / concave structure changes the laminar flow of cooling water into turbulent flow. The cooling effect of turbulent flow is higher than that of laminar flow, which facilitates the cooling of the movable mold.

[0009] As an optimization, in the aforementioned cooling structure of the injection molding mold, the cooling circuit includes a first side and a second side, with the first side facing the second side. The first side is a plane, and the second side has a corrugated or uneven structure. When water flows into the cooling circuit through the connecting channel, the water flow direction is opposite to the second side. The corrugated or uneven structure exerts a reaction force on the water flow, which can quickly change laminar flow into turbulent flow.

[0010] As an optimization, in the aforementioned cooling structure of the injection mold, the main cooling water inlet and outlet are circular cylindrical structures with an inner diameter of d2, and the connecting channel is a circular cylindrical structure with an inner diameter of d1, wherein d2 is greater than d1. The design of the inner diameter d2 of the main cooling water inlet and outlet being larger than the inner diameter of the connecting channel increases the water flow velocity as it passes through the connecting channel, thereby improving the cooling effect and quickly removing heat from the movable mold.

[0011] As an optimization, in the aforementioned cooling structure of the injection mold, the cooling water inlet / outlet channel is a conical columnar structure that is narrow at the top and wide at the bottom. The upper end of the cooling water inlet / outlet channel is connected to a connecting channel, and the lower end of the cooling water inlet / outlet channel is connected to the main cooling water inlet / outlet. The design of the cooling water inlet / outlet channel as a conical columnar structure with a narrow upper end and a wide lower end facilitates further acceleration of the water flow velocity through the main cooling water inlet / outlet, further improving the cooling effect and accelerating the removal of heat from the movable mold.

[0012] As an optimization, in the aforementioned cooling structure of the injection mold, the main cooling water inlet and outlet, cooling water inlet and outlet channels, and connecting channels are located within the first joint, and the cooling circuit is located within the second joint. The first and second joints are fixedly connected. The first and second joints can be fixedly connected by applying electricity and pressure, or by adding a sealing strip between the first and second joints and then tightening them. Alternatively, the cooling structure can be manufactured directly using 3D printing. Compared with traditional machining methods, the above method allows for the design of complex cooling circuit structures, such as corrugated or uneven structures.

[0013] For injection molding dies, the technical solution of this application is as follows:

[0014] The injection molding mold includes the cooling structure of the injection molding mold of the present invention.

[0015] As an optimization, in the aforementioned injection molding mold, the injection molding mold includes a movable mold body, and the cooling structure is fixedly connected to the movable mold body. The axial direction of the cooling water inlet / outlet channel is consistent with the direction in which the cooling structure is fixed to the movable mold body. This design ensures good sealing between the cooling water inlet / outlet channel and the main cooling water inlet / outlet, while also improving the assembly operability and safety of the cooling structure.

[0016] As an optimization, in the aforementioned injection molding die, the movable mold is a car bumper movable mold, and the cooling structure is fixedly connected to the lower grille opening. Because the air inlet of the lower grille opening of the car bumper movable mold is equipped with an injection gate and is prone to high temperatures, it is a crucial area in the movable mold where improved cooling efficiency is necessary. Placing the cooling structure at this location allows for more efficient cooling of the movable mold.

[0017] As an optimization, the aforementioned injection molding mold has at least two cooling structures.

[0018] As an optimization, in the aforementioned injection molding mold, the main cooling water channels are evenly distributed within the movable mold body. This design increases the contact area between the main cooling water channels and the movable mold body, thus significantly improving the cooling effect.

[0019] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0020] (1) Improved cooling effect compared to traditional cooling structures. This utility model improves the cooling effect by designing a complex cooling circuit, such as a corrugated structure on the second side of the cooling circuit. This corrugated structure can change the laminar flow of cooling water into turbulent flow when the cooling water flows through it. The cooling effect of turbulent flow is higher than that of laminar flow, which facilitates further cooling of the movable mold. In traditional cooling structures, the cooling circuit is often straight and does not have this effect. At the same time, the inner diameter d2 of the main cooling water inlet and outlet is designed to be larger than the inner diameter d1 of the connecting channel, and the cooling water inlet and outlet channel is designed as a conical columnar structure that is narrow at the top and wide at the bottom. The upper end of the cooling water inlet and outlet channel is connected to the connecting channel, and the lower end is connected to the main cooling water inlet and outlet. This makes the water flow velocity continuously increase when the water entering from the main cooling water inlet and outlet flows through this structure, further improving the cooling effect.

[0021] (2) The cooling structure of this utility model is fixedly connected by an electric pressure method. Compared with the traditional cutting method, this method can design a complex cooling circuit, such as the corrugated structure of the cooling circuit of this utility model. Traditional cutting technology cannot achieve this, and therefore cannot achieve the above-mentioned cooling effect. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the cooling structure of the injection molding die of this utility model applied to the lower grille part of the movable mold of an automobile bumper.

[0023] Figure 2 This is a three-dimensional perspective view of the cooling structure of the injection molding mold of this utility model.

[0024] Figure 3 This is a side perspective view of the cooling structure of the injection molding mold of this utility model.

[0025] Figure 4 This is a schematic diagram of the energized and pressurized connection of the cooling structure of the injection molding mold of this utility model.

[0026] The labels in the attached diagram are as follows: 1-Modible mold; 11-Modible mold body; 2-Lower grille opening; 3-Cooling structure; 31-First joint; 32-Second joint; 33-Main cooling water inlet and outlet; 331-Main cooling water outlet; 332-Main cooling water inlet; 34-Cooling water inlet and outlet channel; 341-Cooling water outlet channel; 342-Cooling water inlet channel; 35-Connecting channel; 351-Outlet connecting channel; 352-Inlet connecting channel; 36-Cooling circuit; 361-First side; 362-Second side; 4-Main cooling water path. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings, but it should not be construed as a basis for limiting this utility model.

[0028] Reference to embodiments of this utility model Figure 1-4 .

[0029] like Figure 1 The diagram shows the application of the cooling structure 3 of the injection molding die of this utility model to the lower grille area of ​​the movable mold 1 of an automobile. It should be noted that the cooling structure 3 is provided on at least one side of the movable mold 1 or the fixed mold, and can be provided at any position on the movable mold 1 or the fixed mold, especially in product parts requiring enhanced cooling. This embodiment only uses the lower grille area of ​​the movable mold 1 of an automobile as an example; the application of the cooling structure 3 is not limited to this. Figure 1As shown, the movable mold 1 and the fixed mold (not shown) close together to form a mold cavity. High-temperature molten plastic is injected into the mold cavity to form plastic products such as bumpers. The movable mold 1 consists of a movable mold body 11 and a cooling structure 3. The cooling structure 3 is located at the lower grille opening 2 of the movable mold 1, with two structures arranged side-by-side on the left and right. The movable mold body 11 has an opening for assembling the cooling structure 3. After the cooling structure 3 is assembled into the opening, it can be fixedly connected to the movable mold body 11 using bolts or other connection methods. It should be noted that the number of cooling structures 3 is not limited to two, and their installation position can be set at any position on the movable mold body 11 depending on the different mold structures. The reason for placing the cooling structure 3 at the lower grille opening 2 in this embodiment is that the air inlet of the lower grille opening 2 is equipped with an injection gate and is prone to high temperatures, making it an important area in the movable mold 1 where improved cooling efficiency is needed. In this embodiment, the cooling structure 3 is positioned in the narrow area of ​​the movable mold 1 where enhanced cooling is most needed.

[0030] like Figure 1 As shown in the figure, the dashed lines indicate the water pipe layout, including multiple main cooling water channels 4 and cooling structures 3 connecting the main cooling water channels 4. The main cooling water channels 4 are evenly distributed inside the movable mold body 11 and are connected to a temperature control machine (not shown) through the main cooling water inlet and outlet 33, thereby cooling the movable mold 1 when the temperature rises during injection molding.

[0031] like Figure 3 The diagram shows a side perspective view of the cooling structure of the injection molding mold of this utility model. The cooling structure 3 is stepped in shape and includes a main cooling water inlet / outlet 33, a cooling water inlet / outlet channel 34 vertically connected to the main cooling water inlet / outlet 33, a connecting channel 35 connected to the cooling water inlet / outlet channel 34, and a cooling circuit 36 ​​connected to the connecting channel 35. The main cooling water inlet / outlet 33 is a cylindrical structure with an inner diameter of d2. The cooling water inlet / outlet channel 34 is a conical cylindrical structure that is narrow at the top and wide at the bottom. The cooling water inlet / outlet channel 34 is a horizontally placed cylindrical structure with an inner diameter of d1. The inner diameter d2 of the main cooling water inlet / outlet 33 is larger than the inner diameter d1 of the cooling water inlet / outlet channel 34. d1 = d2 * (90% - 70%). This structure can increase the flow rate of cooling water from the main cooling water inlet / outlet 33, accelerate the replacement of cooling water in the cooling circuit 36, and thus improve cooling efficiency.

[0032] like Figure 2As shown, the main cooling water inlet / outlet 33 includes a main cooling water outlet 331 and a main cooling water inlet 332. The cooling water inlet / outlet channel 34 includes a cooling water outlet channel 341 and a cooling water inlet channel 342. The connecting channel 35 includes an outlet connecting channel 351 and an inlet connecting channel 352. The cooling water flows in the cooling structure 3 as follows: it enters from the main cooling water inlet 332, flows to the cooling water inlet channel 342, then to the inlet connecting channel 352, then into the cooling circuit 36, then into the outlet connecting channel 351, then into the cooling water outlet channel 341, and finally into the main cooling water path 4 via the main cooling water outlet 331. The axial direction of the cooling water inlet / outlet channel 34 is consistent with the direction in which the cooling structure 3 is assembled to the movable mold body 11. This structure can ensure good sealing between the cooling water inlet / outlet channel 34 and the main cooling water inlet / outlet 33, and at the same time improve the assembly operability and safety of the cooling structure 3.

[0033] like Figure 2 , 3 As shown, the cooling circuit 36 ​​includes a first side surface 361 and a second side surface 362. The first side surface 361 is planar, and the second side surface 362 has a corrugated structure. The corrugated structure of the second side surface 362 can create turbulent flow of cooling water, thereby improving cooling efficiency. It should be noted that this embodiment only uses the corrugated structure of the second side surface 362 as an example. In actual applications, depending on different mold structures, at least one side of the cooling circuit 36 ​​may be a corrugated structure, a concave-convex structure, or any other structure that can generate turbulence. The corrugated structure is difficult to achieve using traditional cutting processes. To achieve this structure, this invention uses an electro-pressurized joining method. The traditional cutting process involves fabricating the cooling circuit 36 ​​first, and then using cutting processes to realize the structure of the cooling circuit 36 ​​internally. The electro-pressurized joining method, however, is as follows: Figure 4 As shown, firstly, the main cooling water inlet / outlet 33, cooling water inlet / outlet channel 34, connecting channel 35, and cooling circuit 36 ​​are respectively machined on the separate first joint 31 and second joint 32. Then, the first joint 31 and second joint 32 are joined together by applying electricity and pressure. The machined first joint 31 and second joint 32 come into contact with each other, as shown... Figure 4 While applying pressure in the direction of the arrow shown, a low-voltage, high-current direct current is introduced from the power source, causing the contact surfaces of the first joint 31 and the second joint 32 to melt and complete the joint. Compared with traditional processing techniques, this method reduces costs and shortens the manufacturing cycle, while enabling the creation of cooling water passages with more complex structures and greater design freedom. It should be noted that the method for realizing the complex cooling circuit 36 ​​is not limited to joining by applying pressure; it can also be achieved through 3D printing, or by adding a sealing strip between the first joint 31 and the second joint 32 before fastening.

[0034] The foregoing general description of the utility model and its specific embodiments should not be construed as limiting the technical solution of the utility model. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the utility model, to form other technical solutions within the protection scope of this utility model.

Claims

1. Cooling structure of an injection-molding mold, characterized in that: The cooling structure (3) includes a main cooling water inlet and outlet (33), a cooling water inlet and outlet channel (34) connecting the main cooling water inlet and outlet (33), a connecting channel (35) connecting the cooling water inlet and outlet channel (34), and a cooling circuit (36) connecting the connecting channel (35). The main cooling water inlet and outlet (33) is externally connected to the main cooling water path (4). At least one side of the cooling circuit (36) is a corrugated structure or a concave-convex structure.

2. The cooling structure of an injection mold according to claim 1, characterized by: The cooling circuit (36) includes a first side (361) and a second side (362), wherein the first side (361) is a plane and the second side (362) is a corrugated structure or a concave-convex structure.

3. The cooling structure of an injection mold according to claim 1, characterized by: The main cooling water inlet and outlet (33) are circular cylindrical structures with an inner diameter of d2, and the connecting channel (35) is a circular cylindrical structure with an inner diameter of d1, wherein d2 is greater than d1.

4. The cooling structure of an injection mold according to claim 3, characterized by: The cooling water inlet / outlet channel (34) is a conical columnar structure that is narrow at the top and wide at the bottom. The upper end of the cooling water inlet / outlet channel (34) is connected to the connecting channel (35), and the lower end of the cooling water inlet / outlet channel (34) is connected to the main cooling water inlet / outlet (33).

5. The cooling structure of an injection mold according to claim 1, characterized by: The main cooling water inlet and outlet (33), cooling water inlet and outlet channel (34), and connecting channel (35) are located in the first joint (31), and the cooling circuit (36) is located in the second joint (32). The first joint (31) and the second joint (32) are fixedly connected.

6. Injection molding mold, characterized in that: A cooling structure comprising the injection molding mold according to any one of claims 1-5.

7. The injection molding mold according to claim 6, characterized in that: The injection molding mold includes a movable mold (1), the movable mold (1) includes a movable mold body (11), the cooling structure (3) is fixedly connected to the movable mold body (11), and the axial direction of the cooling water inlet and outlet channel (34) is consistent with the direction in which the cooling structure (3) is fixed to the movable mold body (11).

8. The injection molding mold according to claim 7, characterized in that: The movable mold (1) is a movable mold for a car bumper, and the cooling structure (3) is fixedly connected to the lower grille opening (2).

9. The injection molding mold of claim 6, wherein: The number of cooling structures (3) shall not be less than two.

10. The injection molding mold of claim 6, wherein: The main cooling water channel (4) is evenly distributed within the movable mold body (11).

Images