A cooling insert for a mold for producing an injection molded part

Abstract

The utility model relates to a kind of cooling inserts of injection molding production mould, including insert main body, insert main body includes outer extension body and cooling body, water inlet and water outlet are equipped on outer extension body, water inlet is connected with the water inlet pipeline in the inside of outer extension body, the water inlet pipeline extends to the inside of cooling body and forms cooling water path in the inside of cooling body, cooling water path is connected with the water outlet pipeline in the inside of outer extension body after being arranged around with shape in the inside of cooling body, and water outlet pipeline is connected to form circulation channel with the water outlet on outer extension body.The utility model aims at avoiding the problem that injection molding is deformed due to uneven cooling of each part.

Description

Technical Field

[0001] This utility model relates to the field of injection molding mold accessories, specifically a cooling insert for injection molding molds. Background Technology

[0002] In injection molding, molten material is injected into a mold cavity and cooled to solidify, forming the molded part. The cooling process is typically the most time-consuming part of the production cycle and a key factor limiting production efficiency. To effectively shorten cooling time, improve production efficiency, and ensure uniform and stable product quality, cooling water channels are usually installed inside the mold. However, in certain areas of the mold, especially in complex and space-constrained areas within the cavity or core, it is difficult to directly machine cooling water channels. Engineers often use embedded cooling inserts as a solution in these situations.

[0003] Traditional cooling inserts are independent functional components with pre-machined cooling channels that are then embedded in specific locations within the mold body. Currently, the most common and fundamental design in the industry is to directly drill through-holes (i.e., drilled direct-flow water channels) inside the insert. During operation, cooling water flows in from one inlet, flows in a straight line through the insert's interior, and then flows out from the other outlet, achieving heat exchange within the injection-molded part through continuous water flow.

[0004] However, the fixed and singular water flow path in a straight water channel structure results in a significant temperature gradient within the insert and in the mold cavity area where the insert contacts it. Areas closer to the water channel experience high heat exchange efficiency and relatively good cooling, while areas farther from the water channel rely primarily on the insert's own heat conduction for heat dissipation, with a much lower cooling efficiency. This uneven cooling rate can lead to inconsistent shrinkage rates across different parts of the injection molded part, subsequently causing deformation. Utility Model Content

[0005] The present invention aims to provide a cooling insert for injection mold production molds to avoid the problem of deformation of injection molded parts due to uneven cooling in different parts.

[0006] To solve the above technical problems, the specific solution adopted by this utility model is as follows: it includes an insert body, which includes an extension body and a cooling body. The extension body is provided with a water inlet and a water outlet. The water inlet is connected to a water inlet pipe inside the extension body. The water inlet pipe extends into the interior of the cooling body and forms a cooling water channel inside the cooling body. The cooling water channel is arranged according to the shape of the cooling body. After circulating inside the cooling body, the cooling water channel connects to the water outlet pipe inside the extension body. The water outlet pipe is connected to the water outlet on the extension body to form a circulation channel.

[0007] Further optimization of a cooling insert for injection molding: The cooling insert is integrally molded using 3D printing technology.

[0008] Further optimization of a cooling insert for injection molding: 3D printing raw material is made of corrosion-resistant mold steel.

[0009] Further optimization of the cooling insert as a mold for injection molding: the cooling water channels are arranged along the edge of the inner wall of the cooling body.

[0010] Further optimization of a cooling insert for injection molding molds: the outer surface of the insert body is provided with a thermally conductive coating.

[0011] Further optimization of the cooling insert for injection mold production: the inner wall of the cooling water channel is provided with turbulence protrusions, which are staggered hemispherical protrusions.

[0012] Further optimization of a cooling insert for injection molding: the height of the turbulence protrusion is 8%-15% of the diameter of the water channel section.

[0013] Further optimization of the cooling insert for injection molding molds: the cooling water channel has a circular cross-section.

[0014] Beneficial effects: This utility model designs an inlet and an outlet on the insert body, as well as a cooling water channel arranged around the insert. Water flows in from the inlet on the insert body, passes through the cooling water channel, and flows out from the outlet. The continuous flow of water promotes heat exchange near the injection molded part. The surrounding cooling water channel ensures uniform cooling of all parts of the injection molded part, avoiding deformation problems caused by uneven cooling of different parts of the injection molded part, and improving production efficiency.

[0015] This invention utilizes 3D printing to integrally form a cooling insert, allowing complex cooling water channels to be seamlessly integrated into the insert. This significantly improves cooling efficiency and product yield while greatly shortening the manufacturing cycle and reducing the overall manufacturing cost of complex parts.

[0016] This invention reduces flow resistance in the cooling water channel by designing a circular cross-section; forces turbulence by adding turbulence protrusions to the inner wall of the cooling water channel, ensuring full contact between the fluid and the inner wall, significantly enhancing the heat exchange efficiency between the water flow and the insert; and accelerates heat transfer from the injection molded part to the cooling insert by designing a thermally conductive coating. The combined effect of the cooling water channel, turbulence protrusions, and thermally conductive coating further improves production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cooling insert of this utility model;

[0018] Figure 2 This is a schematic diagram of the injection molded part corresponding to the cooling insert of this utility model;

[0019] Figure 3 This is a bottom view of the cooling insert of this utility model;

[0020] Figure 4 This is a top view of the cooling insert of this utility model;

[0021] Figure 5 This is a front view of the cooling insert of this utility model;

[0022] Figure 6 This is a front perspective view of the cooling insert of this utility model;

[0023] Figure 7 This is a left view of the cooling insert of this utility model;

[0024] Figure 8 This is a left perspective view of the cooling insert of this utility model;

[0025] Figure 9 This is a cross-sectional schematic diagram of the cooling water circuit of this utility model;

[0026] Figure 10 This is a schematic diagram of the cross-section of the cooling water circuit of this utility model;

[0027] The markings in the diagram are: 1. Cooling body, 2. Extension body, 3. Thermally conductive coating, 4. Inlet, 5. Outlet, 6. Inlet pipe, 7. Outlet pipe, 8. Cooling water passage, 9. Turbulence protrusion, 10. Injection molded part, 11. Insert body. Detailed Implementation

[0028] like Figure 1 and Figure 2 As shown, a cooling insert for an injection molded part production mold includes an insert body 11. The insert body 11 is the core structure that carries the cooling system, integrating water channels and heat exchange interfaces to realize the heat transfer path from the injection molded part 10 to the insert body 11 and then to the cooling water channel 8.

[0029] The cooling insert is integrally formed using 3D printing technology. 3D printing enables the manufacture of cooling inserts with complex internal water channels, reducing the overall manufacturing cost of complex parts and achieving conformal cooling water channels that are impossible with traditional machining processes. The 3D printing material is corrosion-resistant mold steel, which helps the cooling insert resist corrosion from cooling water and molten plastic.

[0030] like Figure 3 and Figure 4As shown, the insert body 11 includes an epitaxial body 2 and a cooling body 1. The epitaxial body 2 is provided with a water inlet 4 and a water outlet 5. The water inlet 4 is connected to a water inlet pipe 6 inside the epitaxial body 2. The water inlet pipe 6 extends into the interior of the cooling body 1 and forms a cooling water channel 8 inside the cooling body 1. The cooling water channel 8 is connected to a water outlet pipe 7 inside the epitaxial body 2. The water outlet pipe 7 is connected to the water outlet 5 on the epitaxial body 2 to form a circulation channel. The epitaxial body 2 integrates the inlet and outlet interfaces of the cooling water channel 8 and accommodates the transition section of the inlet and outlet path of the cooling water channel 8. The cooling body 1 directly contacts the injection molded part 10 and quickly dissipates heat through the internal cooling water channel 8.

[0031] like Figure 5 and Figure 7 As shown, the outer surface of the insert body 11 is provided with a thermally conductive coating 3. Since the thermal conductivity of the thermally conductive coating 3 is higher than that of the cooling insert, and the thermally conductive coating 3 can fill the micro air gap between the insert body 11 and the injection molded part 10, the thermally conductive coating 3 can accelerate the heat transfer speed on the transfer path from the injection molded part 10 to the insert body 11.

[0032] like Figure 6 and Figure 8 As shown, the cooling water channel 8 is arranged around the inside of the cooling body 1. The cooling water flows in the cooling water channel 8 and carries away the heat from the inner wall of the cooling water channel 8. The surrounding cooling water channel 8 ensures uniform cooling of each part of the injection molded part 10.

[0033] The cooling water channel 8 is arranged along the edge of the inner wall of the cooling body 1. The edge close to the inner wall of the cooling body 1 can shorten the heat transfer path from the injection molded part 10 to the insert body 11 to the cooling water channel 8, thereby improving cooling efficiency. The cooling water channel 8 has a circular cross-section, which has a smaller flow resistance.

[0034] like Figure 9 and Figure 10 As shown, the inner wall of the cooling water channel 8 is provided with turbulence protrusions 9. The turbulence protrusions 9 are staggered hemispherical protrusions. The turbulence protrusions 9 force the fluid to generate turbulence, making the fluid interior contact the inner wall of the water channel, increasing the heat transfer area between the fluid and the inner wall of the water channel, and improving the heat exchange efficiency. The height of the turbulence protrusions 9 is 8%-15% of the diameter of the water channel cross-section. The limited height of the protrusions balances the turbulence intensity and the flow resistance of the water channel, avoiding insufficient turbulence due to too low a height and excessive flow resistance due to too high a height.

[0035] The method of using the cooling insert for injection molding molds of this utility model is as follows: The cooling insert is embedded into a preset position in the mold cavity. The external cooling system's water inlet pipe is connected to the cooling insert's water inlet 4, and the return water pipe is connected to the cooling insert's water outlet 5. The cooling water valve is opened to vent air from the cooling insert. Once the water flow in the return water pipe is continuous and stable, the cooling water valve is closed. During injection molding, the cooling water valve is opened again, and cooling water flows in from the cooling insert's water inlet 4, through the water inlet pipe 6, and into the cooling water path 8. After heat exchange carries away the heat from the injection molded part 10, the cooling water flows through the water outlet pipe 7 from the cooling insert's water outlet 5 back to the return water pipe. After injection molding cooling is complete, the cooling water valve is closed, and air is introduced into the water inlet pipe to expel any residual cooling water from the cooling insert. The mold is then opened, and the cooling insert is removed, completing the usage process.

Claims

1. A cooling insert for an injection mold, characterized in that: The device includes an insert body (11), which includes an extension body (2) and a cooling body (1). The extension body (2) is provided with an inlet (4) and an outlet (5). The inlet (4) is connected to the inlet pipe (6) inside the extension body (2). The inlet pipe (6) extends into the cooling body (1) and forms a cooling water channel (8) inside the cooling body (1). The cooling water channel (8) is arranged according to the shape of the cooling body (1). After the cooling water channel (8) surrounds inside the cooling body (1), it connects to the outlet pipe (7) inside the extension body (2). The outlet pipe (7) is connected to the outlet (5) on the extension body (2) to form a circulation channel.

2. The cooling insert for an injection mold as described in claim 1, characterized in that: The cooling insert is integrally formed using 3D printing technology.

3. The cooling insert for an injection molded part production mold according to claim 2, characterized in that: The raw materials used for 3D printing are corrosion-resistant mold steel.

4. The cooling insert for an injection molded part production mold according to claim 1, characterized in that: The cooling water channel (8) is arranged along the edge of the inner wall of the cooling body (1).

5. A cooling insert for an injection mold as described in claim 1, characterized in that: The outer surface of the insert body (11) is provided with a thermally conductive coating (3).

6. A cooling insert for an injection mold as described in claim 1, characterized in that: The inner wall of the cooling water channel (8) is provided with turbulence protrusions (9), which are staggered hemispherical protrusions.

7. A cooling insert for an injection molded part production mold according to claim 6, characterized in that: The height of the turbulence protrusion (9) is 8%-15% of the diameter of the water channel section.

8. A cooling insert for an injection mold as described in claim 1, characterized in that: The cross-section of the cooling water channel (8) is circular.

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