TWM607062U - Injection mold - Google Patents

Abstract

This creation provides an injection mold that includes a metal part as a shell, an additive printing part with a product molding area and a cooling space, an injection material channel connecting the metal part and the product molding area of the additive printing part, and connecting the metal part and augmentation The cooling fluid inlet of the cooling space of the material printing part; and the metal part contains a cavity, and the additive printing part is embedded in the cavity of the metal part. With the injection mold of this creation, the production time and cost of the mold can be reduced, and the temperature of the mold during use can be significantly reduced, and the service life can be increased.

Description

Injection mould

This creation is about an injection mold, especially about an injection mold using additive printing technology.

It is common to complete the manufacture of engineering plastic products by injection molding process. Existing molds are mostly made of metal, such as iron, steel, aluminum alloy and other materials, but their processing cycle is longer, the requirements for the quality of processing tools are higher, and the tool wear is also high, which makes the processing cost quite expensive, and Small batch products are expensive, and even cannot be mass produced due to high production costs.

In addition, because the mold is made of metal, it is difficult to process the cooling pipe of the existing mold. Only simple water channels such as straight travel can be drilled in the formed metal block. Not only the processing cost is extremely high, but also the mold cannot reach Ideal cooling, so that mold wear and reduce mold life.

Patent Document 1 discloses a 3D printing reverse graft molding manufacturing method for injection molds, which uses 3D printing molding processing to manufacture conformal water channels to achieve efficient and full contact between the cooling medium and the cooling conductive pad, and effectively ensure the cooling effect; however, its Although 3D printing technology is used to achieve effective cooling, the product molding part still uses traditional technology to make metal materials by mechanical processing, resulting in expensive production and processing costs. Although the mold has a longer life, it is still Unable to reach reduction The effect of low production cycle.

Traditionally, the reason why the product molding area of the mold is manufactured by mechanical processing is that the more commonly known 3D printing technologies include Fused deposition modeling (FDM) and Selective Laser Sintering (SLS) These two 3D printing technologies are widely adopted by industrial manufacturing, such as using these technologies to design cooling channels in molds; however, the surfaces produced by FDM and SLS technologies have high roughness and cannot produce flat surfaces , So it is not suitable for the surface of the finished mold. Therefore, although there are technologies for manufacturing cooling channels in molds with 3D printing technology, there is no such thing as a technology that can use lower production cost and time compared with machining methods for product molding areas and cooling spaces. Suggestions on appropriate techniques.

[Prior Art Document] China Publication CN110744751A Bulletin

In view of this, the main purpose of this creation is to provide an injection mold, which is manufactured using additive printing technology in the mold forming area, and is placed in the shell of the metal mold to reduce production costs; and design the mold by additive printing technology Cooling space to effectively reduce the temperature of the mold during use.

This creation uses the additive printing technology of light curing molding, including the selective curing of photosensitive resin (Stereolithography, SLA) and digital light processing (DLP) technology. The molding part of the manufacturing mold is not as common as the conventional 3D printing technology. The finished product manufactured, The surface produced by this creative additive printing technology is smooth and accurate in size, which is suitable for molding engineering plastic products in molds, and also greatly reduces production costs.

Accordingly, the present invention provides an injection mold, which includes: a metal part as the outer shell of the injection mold; an additive printing part, the additive printing part includes a product molding area and a cooling space; wherein, the metal part It includes a cavity, and the additive printing part is embedded in the cavity of the metal part.

The injection mold of the present invention further includes an injection material channel connecting the metal part and the product molding area of the additive printing part.

The injection mold of the present invention further includes a cooling fluid inlet, which connects the cooling space between the metal part and the additive printing part.

Furthermore, the additive printing part of this creation is preferably composed of photopolymer materials manufactured by light curing molding technology.

Further, the aforementioned additive printing part can also be a ceramic composition manufactured by light curing molding technology.

Further, the aforementioned additive printing part may include a photopolymer material reinforced with glass fibers.

Further, the aforementioned additive printing part may include a photopolymer material reinforced with carbon fibers.

Furthermore, the aforementioned cooling space is a topological space.

Further, the aforementioned cooling space has a sheet-like structure.

With the injection mold of this creation, the metal part is used as the outer shell and the additive printing part is used as the product molding area. Compared with traditional metal molds, it can effectively reduce production costs and time, and save expensive machining costs.

Furthermore, with the technology of the additive printing part embedded in the cavity of the metal part of this creation, since the metal mold part only needs to produce a shell, the manufacturing process is simple, and the shape of the manufactured product is made of the additive printing part. As a result, different products can use the same metal mold, and only the molded part of the product manufactured by the additive printing technology with lower internal cost needs to be replaced; and if the additive printing part is severely worn, it can be replaced quickly. According to this, the manufacturing cost of the injection mold of this creation can reach 10% of the general iron mold, thus greatly reducing the cost of the mold.

Furthermore, for molds manufactured using additive printing technology, since the temperature of the plastic injected is usually at least 200 degrees Celsius, the surface of the mold will be exposed to the plastic with a temperature difference of 100 degrees during injection, causing the mold surface to expand. Make the mold wear; however, with the injection mold of this creation, more complex cooling channels can be designed in the mold, and as mentioned above, since the additive printing part is embedded in the cavity of the metal part, it can also be used for different products Design different cooling pipes and replace them to maximize cooling efficiency, thereby reducing mold wear and improving mold life.

Furthermore, the additive printing technology of light curing molding is adopted, and glass fiber reinforced materials or carbon fiber reinforced materials are added to the photopolymer materials to strengthen the additive printing manufacturing department Separate the heat-resistant properties of the surface to reduce mold loss.

100: Injection mold

101: Mobile mold

102: Fixed mold

10: Metal part

12: Additive printing part

13: Cooling fluid inlet

14: Injection molding material channel

15: Cooling fluid outlet

120: product forming area

121: cooling space

[Figure 1] A schematic diagram showing the injection mold of this creative implementation mode.

[Figure 2] shows a cross-sectional view along the line A-A based on the schematic diagram of the injection mold in Figure 1.

[Figure 3] A schematic diagram showing the left half of the injection mold according to Figure 2.

[Figure 4] shows a perspective view of the additive printing part of the injection mold half of the first exemplary embodiment of the present creation.

[Figure 4a] shows the front view of the half-edge additive printing part according to Figure 4.

[Figure 4b] shows a cross-sectional view of the half-edge additive printing part of Figure 4 along the line A-A of Figure 4a.

[Figure 4c] shows a perspective view of the half-edge additive printing part of Figure 4 along the line B-B of Figure 4a toward the center of the mold.

[Figure 4d] shows a perspective view of the half-edge additive printing part of Figure 4 along the line C-C of Figure 4c toward the center of the mold.

[Figure 5] shows a perspective view of the additive printing part of the injection mold half of the second exemplary embodiment of the present creation.

[Figure 5a] shows the front view of the half-edge additive printing part according to Figure 5.

[Figure 5b] Shows a perspective view of the half-edge additive printing part of Figure 5 along the line A-A of Figure 5a toward the center of the mold.

[Figure 5c] shows the left side view of the half-edge additive printing part according to Figure 5.

[Figure 5d] According to Figure 5, the half-side additive printing part along the line B-B of Figure 5c toward the center of the mold 的sectional view.

[Figure 6] Comparison of cooling efficiency between the injection mold of this creation and the existing general cooling pipe.

[Figure 7] Analysis of the cooling efficiency of the injection mold of this creation.

In the following, the injection mold of this creation will be explained with drawings. It should be noted that the following content is only used to illustrate this creation, and should not be interpreted as a restriction on this creation.

FIG. 1 is a schematic diagram of an injection mold based on this creation. As shown in FIG. 1, the injection mold 100 includes a shell made of metal, and includes two mold halves that are symmetrical to each other. Both mold halves include a cooling fluid inlet 13. In the injection molding production process and technology, as the ordinary knowledgeable person should understand, the injection mold 100 is composed of a movable mold 101 and a fixed mold 102. The movable mold 101 can be connected with a movable mold plate (not shown), and the fixed mold 102 can be connected with a fixed mold plate. (Not shown) connection; in the injection molding process, when the injection material is injected into the mold and cooled to a solid, the movable mold 101 connected to the movable template moves outward, so that the cooled product can be taken out of the mold. The mobile mold 101 and the fixed mold 102 of this creation have a similar structure, and their shells are both made of metal and belong to the metal part 10 of the injection mold of this creation.

Fig. 2 shows a cross-sectional view along the line A-A according to the schematic diagram of the injection mold of Fig. 1. As shown in Figure 2, the two halves of the injection mold 100 have a basically similar composition, including a metal part 10 and an additive printing part 12. However, as those skilled in the art to which this creation belongs should understand, the injection mold 100 Only one side of the injection mold has an injection material channel 14 for injection material injection during the injection molding process.

Then, because the basic structure of the two halves of the injection mold 100 is similar, it is The description is omitted, and the following is a description of the single-sided mold of the injection mold 100, and the schematic diagram of the left half of the injection mold according to FIG. 2 in FIG. 3 is used for a clearer understanding. As shown in FIGS. 2 and 3, the metal part 10 is used as the outer shell of the additive printing part 12, and can be a rectangular parallelepiped. In an exemplary embodiment of the present invention, the material of the metal part 10 can be iron. It can be manufactured in any way known in the art of this creation; the additive printing part 12 can also have a rectangular parallelepiped configuration, the main material of which is photopolymer, and it is made by light curing technology, for example, the additive printing part 12 It can be the use of selective curing of photosensitive resin (SLA) or digital light (DLP) technology to harden the composition containing ceramic powder, photosensitive resin, photoinitiator and other additives by ultraviolet light irradiation, and the The finished product has a high degree of detail and a smooth surface. Therefore, when the additive printing part 12 is used as a forming area of an injection molded product, the product obtained by using it will also have high precision and high flatness.

In addition, in order to increase the service life of general photopolymers and reduce the abrasion of the photopolymer contact surface caused by the injection of injection liquid, glass fiber or carbon fiber reinforced materials can also be added to the photopolymer to improve additive printing. Part of the life; for example, 5% glass fiber can be added to the photopolymer material, and the photopolymer can be any suitable existing material, for example, 50% trimethylol containing 600ppm inhibitor (inhibitor) can be used Base propane triacrylate and so on.

A cuboid cavity is formed on the side of the metal part 10. The size of the cuboid cavity matches the size of the additive printing part 12 that is also cuboid, so that the additive printing part 12 can be embedded in the metal part 10 properly and fitfully. In the cavity, and when the additive printing part 12 is severely worn and needs to be replaced, only the additive printing technology is used to manufacture a new additive printing part 12 without replacing the metal part 10, thereby reducing production time and cost.

The additive printing part 12 further includes a product forming area 120, so that For products of different shapes, it is only necessary to use the additive printing technology to design and form the additive printing part 12 of the forming area 120 of the different product, and replace it. Further, the injection material channel 14 of the injection mold 100 connects the metal part 10 and the product forming area 120 of the additive printing part 12, and a single straight injection material channel can be made in the metal part 10 by mechanical processing technology, which can be repeated many times Utilizing the metal part 10 including a single straight injection molding material channel can effectively reduce the production cycle and cost.

In addition, since the product molding area 120 of this creation is made by additive printing technology, for common additive printing materials such as ceramics and plastics, during the injection molding process, the high temperature of the injection liquid will cause the mold to shrink. When cooling, the mold can only be used 10 times or less; therefore, this creation also uses additive printing technology to design and implement a more complicated pipeline structure to improve cooling efficiency. Therefore, the additive printing part 12 of this creation also includes a cooling space 121, and as shown in FIG. 3, the cooling fluid inlet 13 is located at the upper end of the metal part 10. The cooling pipe passes through the upper part of the metal part 10 from the cooling fluid inlet 13 and then enters the augmentation. Therefore, the metal part 10 only needs to be processed and drilled out of the conventional pipe, and the additive printing part 12 realizes a complicated cooling pipe structure, thereby reducing production costs and improving cooling efficiency.

4 is a perspective view of the additive printing part of the injection mold half of the first exemplary embodiment of the present creation. As shown in FIG. 4, the additive printing part 12 includes a product molding area 120, a cooling space 121, a cooling fluid inlet 13 and cooling The fluid outlet 15, in which the positions of the cooling fluid inlet 13 and the cooling fluid outlet 15 shown in FIG. 4 are only an exemplary arrangement. Generally, the knowledgeable person can also adjust the positions of the two according to needs. For example, the cooling fluid inlet 13 can The cooling fluid outlet 15 can be arranged relative to the lower part of the additive printing part 12 in FIG. 4, and the cooling fluid outlet 15 can be arranged relative to the upper part of the additive printing part 12 in FIG. 4, etc. The present creation does not limit this.

In the first exemplary embodiment of the present creation, as shown in FIG. 4, the cooling space 121 is composed of a columnar topological space. The configuration of the columnar topological space allows the pipe to withstand greater injection liquid pressure, and Compared with the traditional simple cooling pipes, this complex design of this creation can conduct heat more effectively, lower the overall mold temperature, reduce mold wear, and increase production capacity. The cooling fluid can use any known cooling fluid in the technical field to which this creation belongs, including but not limited to water, glycol, oil and gas.

Figure 4a is a front view of the half-edge additive printing part according to Figure 4, Figure 4b is a cross-sectional view of the half-edge additive printing part according to Figure 4 along the line AA of Figure 4a, and Figure 4c is a cross-sectional view of the half-edge additive printing part according to Figure 2 along Figure 4a BB A perspective view of the line toward the center of the mold. Figure 4d is a perspective view of the half-edge additive printing part of Figure 4 along the line CC of Figure 4c toward the center of the mold. It can be seen that the front side of the additive printing part 12 has a groove area, which is the product forming area 120; the additive printing part 12 also includes a cooling space 121, which has a columnar topology.

FIG. 5 is a perspective view of the additive printing part of the half-side injection mold according to the second exemplary embodiment of the present creation. As shown in FIG. 5, the additive printing part 12 includes a product molding area 120, a cooling space 121, a cooling fluid inlet 13 and cooling The fluid outlet 15, where the positions of the cooling fluid inlet 13 and the cooling fluid outlet 15 shown in FIG. 5 are only an exemplary setting method, and generally the knowledgeable person can adjust the positions of the two according to needs. In the second exemplary embodiment of the present creation, as shown in FIG. 5, the cooling space 121 has a sheet-shaped space structure. This structure can also make the pipeline bear greater pressure of the injection liquid, and conduct heat more effectively and reduce The overall mold temperature reduces mold wear and improves production capacity. The cooling fluid can use any known cooling fluid in the technical field to which this creation belongs, including but not limited to water, glycol, oil and gas.

Figure 5a is a front view of the half-edge additive printing part based on Figure 5, and Figure 5b is based on Figure 5 is a perspective view of the half-edge additive printing part along the line AA of Figure 5a towards the center of the mold. Figure 5c is a left side view of the half-edge additive printing part based on Figure 5, and Figure 5d is a perspective view of the half-edge additive printing part based on Figure 5 along Figure 5c BB Sectional view of the line towards the center of the mold. It can be seen that the front side of the additive printing part 12 has a groove area, which is the product molding area 120; the additive printing part 12 also includes a cooling space 121, which has a sheet-like structure.

By using the injection mold of this creation and designing a complex cooling space with additive printing technology, this creation can improve the cooling effect of the mold and increase the service life of the mold. Based on this, the injection mold of this creation was evaluated and tested. Figure 6 is a comparison of the cooling efficiency of the injection mold created with the existing general cooling pipes. The left picture shows the composition of the existing general simple cooling pipeline, and the cooling fluid travels in a simple straight way; the right picture shows In order to design a cooling pipe based on this creation using additive printing technology, the cooling fluid can flow through the injection mold in a more complicated route. Obviously, the fluid color of the complex cooling pipe on the right has changed from dark blue at the inlet to red at the outlet, which means that the temperature of the fluid increases during the process of flowing through the pipe. It can be seen that it exchanges with the injection mold and absorbs a considerable amount of heat energy. , Which reduces the overall temperature of the injection mold, and its cooling power can reach 5.7kW. In contrast, the fluid color of the simple cooling pipe on the left only changes to light blue at the outlet, which shows that the heat exchanged with the injection mold is significantly lower Many out, its cooling power is only about 2.9kW. According to this, the complex cooling pipe system using the additive printing technology of this creation can fully achieve heat exchange and reduce the overall temperature of the mold.

Figure 7 is the analysis of the cooling efficiency of the injection mold creation, using COMSOL multiphysics (Comsol Multiphysics) for simulation calculation, where the vertical axis represents the temperature difference between the mold after the injection process and the mold before the injection (℃ ), the horizontal axis is the time (seconds) of the injection molding process, (c) is the simulation result of the temperature difference when there is no cooling space in the mold, and (a) is the design based on this creation using additive printing technology as shown in the right picture in Figure 6 Cooling pipe, injection mold after injection The relationship between temperature and time. The simulation calculation results show that the cooling efficiency of the cooling pipe according to this creation is greatly improved. The temperature difference between the two can reach about 40℃ after 8.5 seconds of injection molding. It shows that the use of additive printing technology to design the cooling space in this creation can not only Significantly reduce production costs and time, and can significantly improve the cooling effect of the mold.

Accordingly, with the injection mold of this creation, this creation can use additive printing to manufacture the product molding area to facilitate multiple replacements, and also design a complex cooling space through additive printing technology, thereby effectively improving the cooling efficiency of the mold and increasing its Service life.

100: Injection mold

10: Metal part

12: Additive printing part

14: Injection molding material channel

120: product forming area

121: cooling space

Claims (9)

An injection mold, characterized in that it comprises: a metal part as the outer shell of the aforementioned injection mold; an additive printing part comprising a product molding area and a cooling space; wherein the aforementioned metal part comprises a cavity, and the aforementioned increase The material printing part is embedded in the aforementioned cavity. The injection mold described in item 1 of the scope of patent application further includes an injection material channel connecting the metal part and the product molding area of the additive printing part. The injection mold described in item 1 of the scope of the patent application further includes a cooling fluid inlet communicating the metal part and the cooling space of the additive printing part. Such as the injection mold described in item 1 of the scope of patent application, wherein the aforementioned additive printing part is composed of a photopolymer material. Such as the injection mold described in item 1 of the scope of patent application, wherein the aforementioned additive printing part is composed of ceramics. The injection mold described in any one of items 4 or 5 of the scope of patent application, wherein the aforementioned additive printing part further comprises glass fiber reinforced materials. The injection mold described in any one of the 4th or 5th item of the scope of the patent application, wherein the aforementioned additive printing part further comprises a carbon fiber reinforced material. Such as the injection mold described in item 1 of the scope of patent application, wherein the aforementioned cooling space is a topological space. Such as the injection mold described in item 1 of the scope of patent application, wherein the aforementioned cooling space is a sheet structure.

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