Mold with built-in cooling water channel

Abstract

The invention discloses a mold with a built-in cooling water channel. The mold comprises an upper mold plate and a lower mold base. A positioning structure is arranged between the upper die plate and the lower die base. A die cavity is formed in the lower die core, a cooling cavity is formed in the lower die core and located on the outer side of the die cavity, cooling pipes are wound in the cooling cavity, the sections of the cooling pipes are rectangular, and the inner diameters of the cooling pipes are different. The flowing heat conduction efficiency of the cooling pipe is improved through the threaded grooves and the rectangular section.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a mold with a built-in cooling water channel. Background Technology

[0002] Molds are core process equipment in modern manufacturing, often referred to as the "mother of industry." They are specialized tools that impart specific shapes and dimensions to raw materials (such as metals, plastics, and ceramics) through their precision cavities. Their working principle primarily utilizes pressure or heat to fill, shape, and solidify the material within the mold cavity, thereby efficiently and in large quantities producing parts with consistent shapes and precise dimensions. The quality, precision, and lifespan of the mold directly determine the quality, performance, and production cost of the final product.

[0003] Mold technology integrates mechanical design, materials science, precision machining, and intelligent control, and is widely used in almost all industrial fields, including automotive, electronics, home appliances, aerospace, and medical devices. In processes such as plastic injection molding and metal die casting, the high-temperature molten metal fills the mold cavity and needs to be rapidly cooled and solidified to obtain the product and improve production efficiency. The cooling stage typically accounts for more than 70% of the entire production cycle, making the efficiency of the cooling system crucial.

[0004] Existing injection mold cooling water channels are mostly formed by machining and drilling, which has inherent limitations. First, the water channels are mostly cylindrical and arranged in straight lines, which cannot closely conform to the curved contours of complex cavities, resulting in uneven cooling and making the product prone to shrinkage marks or thermal stress deformation in thick-walled areas. Second, the smooth inner walls and constant diameter of the water channels result in predominantly laminar flow of the coolant, leading to low heat exchange efficiency and difficulty in quickly removing heat. More importantly, even when using a series loop, the uniform diameter prevents the active guidance and acceleration of water flow through regular changes in the inner diameter, resulting in weak turbulence and an inability to achieve differentiated heat transfer intensities for different heat load areas of the mold. In summary, there is room for technological improvement. Summary of the Invention

[0005] The present invention aims to solve the technical problem mentioned above, where the cooling water channel structure in the prior art has inherent limitations, and provides a mold with a built-in cooling water channel.

[0006] To solve the above technical problems, the technical solution provided by the present invention is as follows: a mold with built-in cooling water channel, including an upper mold plate and a lower mold base; the lower mold base is provided with a lower mold core, the bottom surface of the upper mold plate is provided with an upper mold core corresponding to the lower mold core, and the upper mold plate is provided with an injection port penetrating the upper mold core;

[0007] A positioning structure is provided between the upper template and the lower mold base; the positioning structure includes a limiting ring provided under the upper template that can be inserted into the lower mold base; a plurality of positioning blocks are provided on the outer side of the limiting ring, and a positioning groove is provided on the inner side of the lower mold base that can accommodate the positioning blocks;

[0008] The lower mold core has a mold cavity, and a cooling cavity is provided inside the lower mold core and located outside the mold cavity. Cooling pipes are coiled inside the cooling cavity. The cross-section of the cooling pipes is rectangular and the inner diameter is different.

[0009] Furthermore, the outer side of the lower mold base is provided with a number of strip-shaped weight-reducing grooves; the top surface of the upper mold plate is provided with a grid-shaped weight-reducing groove.

[0010] Furthermore, a sealing ring is provided between the upper template and the lower mold base, located outside the positioning groove.

[0011] Furthermore, the inner side of the sealing ring is provided with a notch that can accommodate the positioning block.

[0012] Furthermore, the cooling pipe includes a U-shaped pipe 1 and a U-shaped pipe 2, wherein the inner diameter of the pipe 1 is larger than that of the pipe 2.

[0013] Furthermore, the connection between the first pipe and the second pipe is transitioned by a bevel, and each bevel is provided with an insert, which is made of high thermal conductivity alloy steel.

[0014] Furthermore, both pipe one and pipe two have spirally arranged threaded grooves on their inner sides.

[0015] The advantages of this invention compared to the prior art are:

[0016] 1. The serpentine cooling pipes can closely fit the bottom surface of the lower mold cavity, shortening the heat conduction distance and solving the problem of uneven cooling caused by the poor fit of traditional straight water channels to the cavity contour from the source. This effectively eliminates local hot spots on the product and significantly reduces warping deformation and internal residual stress. In addition, the cold take-off pipes are rectangular, which increases the contact area with the lower mold cavity compared to cylindrical cooling pipes.

[0017] 2. The spiral grooves set all over the inner wall significantly increase the heat exchange area and continuously disturb the water flow boundary layer; together with the regular changes in the inner diameter of the pipe, they play a role in actively guiding and accelerating the fluid, ensuring that the coolant can easily form and maintain a turbulent state throughout the process, thereby raising the overall heat transfer coefficient to a new level.

[0018] 3. Alloy steel inserts are installed in specific areas where the inner diameter of the pipe changes, forming a dual optimization mechanism of "structural control" and "material control". The inserts act as thermal bridges and can assist in heat conduction from the mold cavity to the cooling pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a mold with a built-in cooling water channel according to the present invention.

[0020] Figure 2This is a schematic diagram showing the disassembled form of a mold with a built-in cooling water channel according to the present invention.

[0021] Figure 3 This is a schematic diagram of the upper template structure of a mold with a built-in cooling water channel according to the present invention.

[0022] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the lower mold core of a mold with built-in cooling water channel according to the present invention.

[0023] Figure 5 This is a cross-sectional structural diagram of a mold cooling cavity with an internal cooling water channel according to the present invention.

[0024] Figure 6 This is a schematic diagram of the cooling pipe structure of a mold with a built-in cooling water channel according to the present invention.

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the cooling pipe of a mold with a built-in cooling water channel according to the present invention.

[0026] As shown in the figure: 1. Upper mold plate, 2. Lower mold base, 3. Lower mold core, 4. Weight reduction groove, 5. Weight reduction groove two, 6. Injection port, 7. Limiting ring, 8. Positioning block, 9. Positioning groove, 10. Sealing ring, 11. Notched groove, 12. Mold cavity, 13. Cooling cavity, 14. Cooling pipe, 15. Pipe one, 16. Pipe two, 17. Threaded groove, 18. Insert. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] Example 1:

[0029] Combined with appendix Figure 1 , 2 3. A mold with a built-in cooling water channel, including an upper mold plate 1 and a lower mold base 2; a lower mold core 3 is provided in the lower mold base 2, an upper mold core corresponding to the lower mold core 3 is provided at the middle of the bottom surface of the upper mold plate 1, and a material injection port 6 is provided on the upper mold plate 1 through the upper mold core; in the above structure, a workpiece forming area is formed between the lower mold core 3 and the upper mold core, and the material injection port 6 is connected to an external material storage mechanism for injecting material into the lower mold core 3;

[0030] Combined with appendix Figure 1 , 2 3. Based on the above, the outer side of the lower mold base 2 is provided with several strip-shaped weight-reducing grooves 4; the top surface of the upper mold plate 1 is provided with a grid-shaped weight-reducing groove 5; the weight-reducing groove structure increases the surface area of ​​the mold's outer surface, providing more channels for heat exchange; and their uniform arrangement can ensure that the overall temperature field of the mold is uniform and consistent, reducing product deformation, internal stress or defects caused by uneven cooling.

[0031] Combined with appendix Figure 2A positioning structure is provided between the upper template 1 and the lower mold base 2. Specifically, the positioning structure includes a limiting ring 7 located below the upper template 1 that can be inserted into the lower mold base 2; several positioning blocks 8 are provided on the outer side of the limiting ring 7, and a positioning groove 9 is provided on the inner side of the lower mold base 2 that can accommodate the positioning blocks 8. The limiting ring 7 restricts the position of the upper template 1, and the positioning blocks 8 and the positioning groove 9 further improve the stability between the upper template 1 and the lower mold base 2, making it less prone to displacement; a sealing ring 10 is provided between the upper template 1 and the lower mold base 2 and located outside the positioning groove 9, and a notch 11 is provided on the inner side of the sealing ring 10 that can accommodate the positioning blocks 9; the sealing ring 10 reduces the gap between the upper template 1 and the lower mold base 2 and improves the sealing degree.

[0032] Example 2:

[0033] Combined with appendix Figure 4 , 5 6. A mold cavity 12 is provided inside the lower mold core 3. A cooling cavity 13 is provided inside the lower mold core 3 and outside the mold cavity 12. A cooling pipe 14 is coiled inside the cooling cavity 13. The cross-section of the cooling pipe 14 is rectangular and the inner diameter is different. Specifically, the cooling pipe 14 includes a U-shaped pipe 15 and a U-shaped pipe 16. The inner diameter of the U-shaped pipe 15 is larger than that of the U-shaped pipe 16. At the same distance, the flat water channel has a larger contact surface than the circular water channel, which improves the cooling efficiency. The regular change of the inner diameter of the cooling pipe 14 can guide and accelerate the water flow, ensure that the coolant forms and maintains a high-intensity turbulent state, and improve the convective heat transfer effect.

[0034] Based on the above content, combined with the appendix Figure 6 The connection between pipe 15 and pipe 2 16 is transitioned by a slope, and each slope is provided with an insert 18. The insert 18 is made of high thermal conductivity alloy steel. The insert 18 acts as a thermal bridge to assist in heat conduction from the mold cavity 12 to the cooling pipe 14.

[0035] Combined with appendix Figure 7 Both pipe 15 and pipe 2 16 have spirally arranged threaded grooves 17 on their inner sides; by processing the spiral lines on the inner wall of the cooling pipe 14, the water flows along the spiral, expanding the water flow area and generating centrifugal force, thereby enhancing heat exchange and improving efficiency.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A mold with built-in cooling water channels, comprising an upper mold plate (1) and a lower mold base (2); characterized in that: The lower mold base (2) is provided with a lower mold core (3), and the upper mold plate (1) is provided with an upper mold core corresponding to the lower mold core (3) at the middle of the bottom surface. The upper mold plate (1) is provided with an injection port (6) that penetrates the upper mold core. A positioning structure is provided between the upper template (1) and the lower mold base (2); the positioning structure includes a limiting ring (7) provided under the upper template (1) that can be inserted into the lower mold base (2); a plurality of positioning blocks (8) are provided on the outer side of the limiting ring (7), and a positioning groove (9) is provided on the inner side of the lower mold base (2) that can accommodate the positioning blocks (8); The lower mold core (3) is provided with a mold cavity (12). A cooling cavity (13) is provided inside the lower mold core (3) and outside the mold cavity (12). A cooling pipe (14) is coiled inside the cooling cavity (13). The cooling pipe (14) has a rectangular cross-section and different inner diameters.

2. The mold with a built-in cooling water channel according to claim 1, characterized in that: The lower mold base (2) has several strip-shaped weight-reducing grooves (4) arranged on its outer side; the upper mold plate (1) has a grid-shaped weight-reducing groove (5) on its top surface.

3. The mold with a built-in cooling water channel according to claim 1, characterized in that: A sealing ring (10) is provided between the upper template (1) and the lower mold base (2) and outside the positioning groove (9).

4. The mold with a built-in cooling water channel according to claim 3, characterized in that: The inner side of the sealing ring (10) is provided with a notch (11) that can accommodate the positioning block (9).

5. A mold with a built-in cooling water channel according to claim 1, characterized in that: The cooling pipe (14) includes a U-shaped pipe one (15) and a pipe two (16), wherein the inner diameter of the pipe one (15) is larger than that of the pipe two.

6. A mold with a built-in cooling water channel according to claim 5, characterized in that: The connection between the first pipe (15) and the second pipe (16) is transitioned by a slope, and each slope is provided with an insert (18), which is made of high thermal conductivity alloy steel.

7. A mold with a built-in cooling water channel according to claim 6, characterized in that: Both pipe one (15) and pipe two (16) have spirally arranged threaded grooves (17) on their inner sides.

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