Injection mold cold runner structure prepared based on 3D printing

Abstract

The utility model discloses an injection mold cold runner structure based on 3D printing preparation, including upper die plate, lower die plate and the cooling runner main body of being located between upper die plate and lower die plate, the cooling runner main body is by cross -shaped pipeline, connecting pipe and the connecting portion of cross -shaped pipeline end portion constitution, and three integrally form, the upper layer runner is commonly equipped with along the pipeline extension direction in the cross -shaped pipeline and the connecting pipe upper portion of cooling runner main body. The existing cold runner system has the problems of poor cooling effect, easy to block glue and difficult to clean, and the poor flowability of the glue cannot be widely used. The cooling runner system designed by the utility model can solve the problem that the current part of high hardness NR glue product cannot use the cold runner system. Because the upper layer runner and the lower layer runner are closely attached to the four sides of the middle layer runner, the cooling uniformity is good, the glue temperature is stable and the temperature difference is small, which can effectively solve the problems of easy blocking of the runner, flow rate difference and the like.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically, it relates to a cold runner structure for injection molds based on 3D printing. Background Technology

[0002] Injection molds are precision tools that impart specific shapes to plastics through closed cavities. The principle involves injecting molten plastic raw material into the mold cavity under high pressure. After cooling and solidification, the mold opens and ejects the formed part. In the injection molding process, the runner system, as a crucial channel connecting the injection molding machine and the cavity, has a significant impact on melt flow characteristics, pressure loss, and the quality of the final product.

[0003] like Figure 1 As shown, the cooling channels of traditional injection molds are mostly straight and are usually made by machining. However, straight channels cannot fit the complex contours of the mold, resulting in uneven cooling, long injection cycles, and difficulty in guaranteeing product quality.

[0004] However, due to the limitations of machining technology, complex flow channel shapes often present problems such as high processing difficulty, long processing time, difficulty in ensuring accuracy, and low material utilization. In particular, when facing cold flow channels with irregular cross-sections or complex internal topologies, traditional processing methods are unable to meet the manufacturing requirements of high precision and high efficiency. Utility Model Content

[0005] One objective of this invention is to provide a cold runner structure for injection molds based on 3D printing, which solves the technical problem in the prior art where the main body of the cooling runner cannot closely fit the complex contour of the injection mold, resulting in poor product performance. Another objective of this invention is to address the technical problem of how to prepare an injection mold with a complex cooling runner body, based on solving the above problems.

[0006] The objective of this utility model can be achieved through the following technical solutions: A 3D-printed injection mold cold runner structure includes an upper mold plate, a lower mold plate, and a cooling runner body located between the upper and lower mold plates. The cooling runner body consists of a cross-shaped pipe, a connecting pipe, and a connecting portion located at the end of the cross-shaped pipe, all three being integrally formed. The upper part of the cross-shaped pipe and the connecting pipe of the cooling runner body are provided with an upper runner along the pipe extension direction, and the lower part is provided with a lower runner along the pipe extension direction. The connecting portion of the cooling runner body has a cylindrical structure with a U-shaped continuous runner inside. The U-shaped continuous runners of two adjacent connecting portions are interconnected through the upper and lower runners, respectively, while the upper and lower runners are interconnected with each other through the U-shaped continuous runners. The cooling runner body has a cross-shaped middle runner corresponding to the cross-shaped pipe portion.

[0007] Furthermore, the upper and lower flow channels are arranged in an axisymmetric manner.

[0008] Furthermore, the cooling channel body of the connecting pipe is provided with a medium inlet and a medium outlet, which are respectively connected to the medium inlet pipe and the medium outlet pipe.

[0009] Furthermore, the intersection of the middle layer flow channels is provided with through holes that penetrate the upper surface of the cooling flow channel body.

[0010] Furthermore, the middle flow channel is located between the upper flow channel and the lower flow channel.

[0011] Furthermore, the cooling channel body has a central through hole corresponding to the center of the connecting part, and the central through hole is interconnected with the middle layer channel.

[0012] The beneficial effects of this invention are as follows: Compared to traditional cold runner systems, this invention reduces the number of parts required for overall processing in the preparation of the cooling channel body, thus shortening processing time and improving processing efficiency. Simultaneously, it enables complex water channel designs, further enhancing cooling efficiency. Furthermore, in injection mold applications, existing cold runner systems suffer from poor cooling performance, easy clogging, and difficult cleaning, limiting the widespread use of materials with poor flowability. The cooling channel system designed in this invention solves the problem of some high-hardness NR (non-refined rubber) products being unable to use cold runner systems. Because the upper and lower runners are closely fitted around the middle runner, cooling uniformity is excellent, the material temperature is stable with minimal temperature difference, effectively solving problems such as easy clogging and flow rate differences. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a linear cooling channel in the prior art; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is an exploded view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 for Figure 3 Cross-sectional view at point AA; Figure 6 for Figure 3 Cross-sectional view at point BB; Figure 7 for Figure 3 Cross-sectional view at point CC; Figure 8 This is a cross-sectional view of the connecting part in this utility model; Figure 9 This is a schematic diagram showing the layout of the coolant channel and the adhesive channel in this utility model; Figure 10 This is a design model diagram of the coolant channel in this utility model; Figure 11 This is a design model diagram of the adhesive channel in this utility model.

[0014] The attached diagram lists the components represented by each number as follows: 1. Upper template; 2. Lower template; 3. Cooling channel body; 4. Medium inlet pipe; 5. Medium outlet pipe; 301. Cross-shaped pipe; 302. Upper channel; 303. Middle channel; 304. Lower channel; 305. Connecting part; 306. U-shaped continuous channel; 307. Central through hole; 308. Medium inlet; 309. Medium outlet; 310. Connecting pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 2 - Figure 4 As shown, a cold runner structure for an injection mold based on 3D printing includes an upper template 1, a lower template 2, and a cooling runner body 3 disposed between the upper template 1 and the lower template 2. The cooling runner body 3 is made using 3D printing technology, and an injection mold with a complex cooling runner body 3 shape is integrally prepared using 3D printing technology.

[0017] Please refer to it again. Figure 5-8As shown, specifically, the cooling channel body 3 is composed of a cross-shaped pipe 301, a connecting pipe 310, and a connecting part 305 located at the end of the cross-shaped pipe 301, and the three are integrally formed by 3D printing; the upper part of the cross-shaped pipe 301 and the connecting pipe 310 of the cooling channel body 3 are provided with an upper channel 302 along the pipe extension direction, and the lower part is provided with a lower channel 304 along the pipe extension direction, and the upper channel 302 and the lower channel 304 are arranged axially symmetrically; the connecting part 305 of the cooling channel body 3 is cylindrical. The mold has a U-shaped continuous flow channel 306 along its circumference. The U-shaped continuous flow channels 306 of two adjacent connecting parts 305 are interconnected by an upper flow channel 302 and a lower flow channel 304, respectively. The upper flow channel 302 and the lower flow channel 304 are interconnected by the U-shaped continuous flow channel 306. The cooling channel body 3 located in the connecting pipe 310 has a medium inlet 308 and a medium outlet 309, which are connected to the medium inlet pipe 4 and the medium outlet pipe 5, respectively, for introducing coolant to achieve a uniform cooling effect for the injection mold.

[0018] Please refer to it again. Figure 5-8 As shown, the cooling channel body 3 has a cross-shaped middle channel 303 corresponding to the cross-shaped pipe 301. The intersection of the middle channel 303 has a through hole that penetrates the upper surface of the cooling channel body 3. According to the name, the middle channel 303 is located between the upper channel 302 and the lower channel 304. The cooling channel body 3 has a central through hole 307 corresponding to the center of the connecting part 305. The central through hole 307 is interconnected with the middle channel 303 and is used to introduce the adhesive to prepare the product.

[0019] To facilitate understanding of the above-mentioned technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below: Figure 10 This involves using 3D printing technology to fabricate the cooling channel body 3, through which rubber is inserted. After the rubber cools and solidifies, and the cooling channel body 3 is peeled off, a flow channel structure model is revealed. This model facilitates understanding the design shapes of the middle flow channel 303, the upper flow channel 302, and the U-shaped continuous channel (i.e., the coolant channel). Similarly, Figure 11 It is the design shape of the middle layer flow channel 303 (i.e., the adhesive channel); Figure 9 This is a schematic diagram showing the layout of the coolant channels and the adhesive channels.

[0020] Traditional injection molds consist of runner plates, heating plates, heat insulation plates, and cooling tower circulating water channels, which have drawbacks such as long processing time, high material costs, occasional uneven distribution of the plastic material, and temperature differences. The injection mold designed in this invention consists of an upper mold plate 1, a lower mold plate 2, and a cooling runner body 3 prepared using 3D printing technology. After the plastic material enters the 3D-printed middle runner 303, the flow path is extremely short, allowing it to be directly injected into the mold. It is simple to use and the plastic material is evenly distributed.

[0021] In the preparation of the cooling channel body 3, this invention reduces the number of parts required for overall processing compared to traditional cold runners, thus shortening processing time and improving processing efficiency. Simultaneously, it enables complex water channel designs, further enhancing cooling efficiency. Furthermore, in injection mold applications, existing cold runner systems suffer from poor cooling performance, easy clogging, and difficult cleaning, limiting their widespread use for materials with poor flowability (such as NR with a hardness above 70). The cooling channel system designed in this invention solves the problem of some high-hardness NR materials (frequent channel clogging and difficult cleaning) being unable to use cold runner systems. The upper runner 302 and lower runner 304 (coolant channels) are tightly fitted around the middle runner 303 (material channels), ensuring good cooling uniformity, stable material temperature, and minimal temperature difference (within 5°C), effectively resolving issues such as easy clogging and flow rate differences.

[0022] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A cold runner structure for an injection mold based on 3D printing, comprising an upper mold plate (1), a lower mold plate (2), and a cooling runner body (3) disposed between the upper mold plate (1) and the lower mold plate (2); characterized in that: The cooling channel body (3) is composed of a cross-shaped pipe (301), a connecting pipe (310), and a connecting part (305) located at the end of the cross-shaped pipe (301); The cross-shaped pipe (301) and the connecting pipe (310) of the cooling channel body (3) are provided with an upper channel (302) along the pipe extension direction at the top and a lower channel (304) along the pipe extension direction at the bottom. The connecting part (305) of the cooling channel body (3) is cylindrical, and a U-shaped continuous flow channel (306) is provided inside along the circumference. The U-shaped continuous flow channels (306) of two adjacent connecting parts (305) are connected to each other through the upper flow channel (302) and the lower flow channel (304), respectively. The upper flow channel (302) and the lower flow channel (304) are connected to each other in conjunction with the U-shaped continuous flow channel (306). The cooling channel body (3) has a cross-shaped middle layer channel (303) corresponding to the cross-shaped pipe (301).

2. The cold runner structure for injection molds based on 3D printing according to claim 1, characterized in that: The upper flow channel (302) and the lower flow channel (304) are arranged in an axisymmetric manner.

3. The cold runner structure for injection molds based on 3D printing according to claim 1, characterized in that: The cooling channel body (3) located in the connecting pipe (310) is provided with a medium inlet (308) and a medium outlet (309), which are respectively connected to the medium inlet pipe (4) and the medium outlet pipe (5).

4. The cold runner structure for injection molds based on 3D printing according to claim 1, characterized in that: The intersection of the middle layer flow channel (303) is provided with a through hole that penetrates the upper surface of the cooling flow channel body (3).

5. The cold runner structure for injection molds based on 3D printing according to claim 4, characterized in that: The middle flow channel (303) is located between the upper flow channel (302) and the lower flow channel (304).

6. The cold runner structure for injection molds based on 3D printing according to claim 1, characterized in that: The cooling channel body (3) has a central through hole (307) corresponding to the center of the connecting part (305), and the central through hole (307) is connected to the middle layer channel (303).

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