An injection mold

Abstract

The application discloses an injection mold, relates to the technical field of injection molds, and comprises a lower mold frame, an upper mold frame, a male mold and a female mold, the inside of the male mold and the female mold is provided with a plurality of cooling liquid flow channels, each of the cooling liquid flow channels is independently arranged, each of the cooling liquid flow channels is arranged in a net shape and is uniformly distributed on the periphery of a forming mold cavity, the upper mold frame and the lower mold frame are provided with water supply pipeline systems and reflux pipeline systems, the water supply pipeline system and the reflux pipeline system on the upper mold frame are respectively communicated with each of the cooling liquid flow channels on the female mold, and the water supply pipeline system and the reflux pipeline system on the lower mold frame are respectively communicated with each of the cooling liquid flow channels on the male mold. The application can realize uniform and rapid cooling of products, avoids warping, shrinkage marks and other conditions of the products, and effectively shortens the production cycle.

Description

Technical Field

[0001] This application relates to the technical field of injection molds, and in particular to an injection mold. Background Technology

[0002] Currently, injection molds mainly consist of a lower mold base, an upper mold base, a male mold mounted on the lower mold base, a female mold mounted on the upper mold base, a hot runner system, and a cooling system. The male and female molds cooperate to form the molding cavity. The top of the female mold has multiple injection holes that communicate with the molding cavity. Injection material is poured into the molding cavity through these injection holes to achieve product injection molding. During the injection process, the hot runner system continuously heats the injection material to ensure it is in a molten state for easy filling of the mold cavity. The cooling system, on the other hand, injects cooling water into the cooling water channels inside the male and female molds, utilizing the heat conduction of the male and female molds to cool and lower the temperature of the molded product, allowing it to quickly set.

[0003] However, existing cooling systems struggle to effectively accommodate complex product casings, and the poor flowability of the coolant leads to inconsistent cooling rates across different parts of the product, resulting in uneven cooling. This uneven cooling can easily cause quality problems such as product warping and shrinkage marks, severely impacting the product's appearance and performance. Furthermore, poor cooling also extends the product's production cycle, reducing production efficiency and increasing production costs. Summary of the Invention

[0004] In view of the problems existing in the prior art, this application provides an injection mold.

[0005] This application provides an injection mold, which adopts the following technical solution:

[0006] An injection mold includes a lower mold base, an upper mold base, a male mold, and a female mold. The male and female molds each have multiple coolant channels inside, each coolant channel being independently arranged and distributed in a mesh pattern around the periphery of the molding cavity. Both the upper and lower mold bases are equipped with a water supply system and a return water system. The water supply system and return water system on the upper mold base are respectively connected to the coolant channels on the female mold. The water supply system and return water system on the lower mold base are respectively connected to the coolant channels on the male mold.

[0007] Optionally, the top of the master mold and the periphery of each injection hole are provided with partition grooves.

[0008] Optionally, the water supply system on the upper mold frame is also connected to each of the partition slots. The mother mold is provided with multiple water outlet channels, each of which corresponds to a partition slot. The water outlet channels are connected to the partition slots near the bottom. The return water system on the upper mold frame is connected to each water outlet channel on the mother mold.

[0009] Optionally, the partition groove has multiple heat-conducting ports on the side wall near the injection port, which are connected to the injection port. Each heat-conducting port is distributed circumferentially along the injection port, and a heat-conducting block is fixedly installed in each heat-conducting port.

[0010] Optionally, the female mold is provided with an exhaust hole communicating with the forming cavity, and the upper mold frame is provided with a vacuum air passage system, which is connected to the exhaust hole.

[0011] Optionally, multiple exhaust holes are provided, and the diameter of the exhaust holes is controlled between 0.8-1mm.

[0012] Optionally, the vacuum air path system includes a negative pressure chamber disposed at the top of the mother mold, an exhaust groove disposed on the upper mold frame for communicating with the negative pressure chamber, and an air passage disposed on the upper mold frame and communicating with the exhaust groove. Each of the exhaust holes is communicating with the negative pressure chamber. The bottom wall of the upper mold frame is provided with an annular sealing groove along the circumference of the exhaust groove, and a sealing ring is fixedly disposed in the annular sealing groove.

[0013] Optionally, a pneumatic piston block is slidably disposed in the negative pressure chamber. Multiple stop pins are fixedly disposed on the bottom wall of the pneumatic piston block. Each stop pin corresponds to an exhaust hole. The stop pins slide through the corresponding exhaust holes and are used to close the corresponding exhaust holes. The upper mold frame is provided with a driving component for driving the pneumatic piston block to slide. Each exhaust hole has a side flow channel on its side wall, and each side flow channel is connected to the negative pressure chamber. A vent is opened on the pneumatic piston block.

[0014] Optionally, an air-blocking plug is slidably inserted into the vent, the air-blocking plug is adapted to the vent, the air-blocking plug is hollow, a baffle is fixedly installed at the bottom end of the air-blocking plug and is used to abut against the bottom wall of the pneumatic piston block, a vent hole is opened on the side wall of the air-blocking plug, an elastic element is provided on the pneumatic piston block for driving the baffle to slide closer to the bottom wall of the pneumatic piston block, a top cylinder is fixedly installed in the exhaust groove, the top cylinder is connected to the air passage, the top cylinder is used to abut against the air-blocking plug and push the air-blocking plug to slide away from the pneumatic piston block.

[0015] Optionally, the outer side wall at the bottom of the top cylinder is provided with an insertion ramp along the circumference of the top cylinder, and the inner side wall at the top of the air baffle is provided with an insertion groove adapted to the insertion ramp along the circumference of the air baffle.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. This application sets up multiple independent and mesh-like coolant channels inside the male and female molds, which are evenly distributed around the outside of the molding cavity. Combined with the water supply and return systems on the upper and lower mold frames, the coolant can better conform to the complex product shape and ensure the fluidity of the coolant. This achieves uniform and rapid cooling of the product, avoids warping, shrinkage marks, and other issues, and effectively shortens the production cycle.

[0018] 2. Because the hot runner system needs to continuously heat the injection material during the injection molding process, the heat generated by the hot runner system is directly transferred to the master mold. As a result, when the product is finished and is being cooled, the temperature of the area on the master mold that is in direct contact with the hot runner system is difficult to cool efficiently, leading to a longer demolding time. By setting partition grooves on the top of the master mold along the periphery of each injection hole, the heat conduction path can be effectively blocked, reducing the impact of heat on the master mold during the injection molding process and facilitating subsequent cooling.

[0019] 3. When the product is cooled and shaped, the coolant can flow into the partition groove through the water supply system on the upper mold frame, and then flow back to the return water system on the upper mold frame through the water outlet channel connected to the bottom of the partition groove. The flow of coolant in the partition groove can further improve the cooling effect around the injection hole, reduce product warping and shrinkage marks, and shorten the production cycle.

[0020] 4. By opening multiple heat conduction ports connected to the injection port on the side wall of the partition groove near the injection port, and fixing heat conduction blocks inside the heat conduction ports, the heat around the injection port can be effectively conducted to the coolant in the partition groove, thereby enhancing the cooling effect at the injection port location.

[0021] 5. By setting vent holes on the mother mold that are connected to the molding cavity, and setting a vacuum path system on the upper mold frame that is connected to the vent holes, the air in the molding cavity is discharged before injection molding to form negative pressure, which can effectively avoid defects such as weld lines, bubbles, and dents on the molded product caused by poor venting.

[0022] 6. A pneumatic piston block is installed inside the negative pressure chamber. The stop pins on the bottom wall of the pneumatic piston block can seal the exhaust holes. During the injection molding process, the pneumatic piston block is driven to slide by the driving component, so that the stop pins seal the corresponding exhaust holes respectively, which can prevent the injection molding material from entering the exhaust holes and causing blockage. When exhaust is required, the pneumatic piston block is driven to slide upward by the driving component, so that the side flow channel is connected with the corresponding exhaust hole. In addition, the air vent on the pneumatic piston block provides a channel for gas flow. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of an embodiment of this application;

[0024] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application;

[0025] Figure 3 This is a schematic diagram illustrating the structure of the master mold in an embodiment of this application;

[0026] Figure 4 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to express the structural cross-sectional view of the location of the partition groove;

[0027] Figure 5 This is a partial structural schematic diagram of an embodiment of this application, mainly used to express the structural cross-sectional view of the location of the exhaust port.

[0028] Explanation of reference numerals in the attached drawings: 100, molding cavity; 101, coolant flow channel; 102, water supply channel; 103, return channel; 1, lower mold base; 2, upper mold base; 21, venting groove; 22, air passage; 23, sealing ring; 24, driving component; 25, ejector cylinder; 3, male mold; 4, female mold; 41, injection hole; 42, partition groove; 421, heat conduction port; 422, heat conduction block; 43, water outlet channel; 44, vent hole; 441, side flow channel; 45, negative pressure chamber; 46, pneumatic piston block; 461, stop pin; 462, vent; 463, elastic component; 47, air stop plug; 471, baffle; 472, vent hole; 5, hot runner system. Detailed Implementation

[0029] The following will be combined with the appendix Figure 1 -Appendix Figure 5 The technical solutions in the embodiments of the present invention are clearly and completely described herein. The described embodiments are only possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of the present invention without creative effort, and these embodiments are also within the protection scope of the present invention.

[0030] The inventors of this application have discovered that existing cooling systems are ineffective at handling complex product casings, and the poor flowability of the coolant leads to inconsistent cooling rates across different parts of the product, resulting in uneven cooling. This uneven cooling easily causes quality problems such as product warping and shrinkage marks, severely affecting the product's appearance and performance. Furthermore, poor cooling also extends the product's production cycle, reducing production efficiency and increasing production costs. Therefore, this application discloses an injection mold, primarily employing the following solution:

[0031] This application discloses an injection mold. (Refer to...) Figure 1 and Figure 2The system includes a lower mold base 1, an upper mold base 2, a male mold 3, a female mold 4, and a hot runner system 5. The upper mold base 2 is slidably mounted on the lower mold base 1 in a vertical direction. The lower mold base 1 and the upper mold base 2 cooperate with each other to provide support and mounting base for the male mold 3 and the female mold 4. The male mold 3 is fixedly mounted on the top of the lower mold base 1, and the female mold 4 is fixedly mounted on the bottom of the upper mold base 2. The male mold 3 and the female mold 4 cooperate with each other to form a molding cavity 100 for injection molding of the product. The top of the female mold 4 is provided with multiple injection holes 41 that communicate with the molding cavity 100. The hot runner system 5 is connected to each injection hole 41 to continuously heat the injection material during the injection process to ensure that it is in a molten state and can be easily filled into the mold cavity.

[0032] Reference Figure 2 and Figure 3 Specifically, both the male mold 3 and the female mold 4 have multiple coolant channels 101 inside. These coolant channels 101 are independently arranged in a mesh pattern and are evenly distributed around the periphery of the molding cavity 100 according to its shape. This arrangement allows the coolant to better conform to the complex shape of the product, thus cooling the molding cavity 100 more evenly, avoiding cooling dead zones, and preventing warping, shrinkage marks, and other issues. Furthermore, the independent arrangement of each coolant channel 101 ensures the fluidity of the coolant, improves the cooling effect, and effectively shortens the product cooling cycle.

[0033] Reference Figure 1 Both the upper mold frame 2 and the lower mold frame 1 are equipped with a water supply system and a return water system. The water supply system and the return water system on the upper mold frame 2 are respectively connected to each coolant channel 101 on the female mold 4, and the water supply system and the return water system on the lower mold frame 1 are respectively connected to each coolant channel 101 on the male mold 3. Specifically, the water supply system includes multiple independently configured water supply channels 102, and the return water system includes multiple independently configured return channels 103. Each coolant channel 101 on the male mold 3 corresponds to one water supply channel 102 and one return channel 103 on the lower mold frame 1, and is connected to the corresponding water supply channel 102 and return channel 103. Each coolant channel 101 on the female mold 4 corresponds to one water supply channel 102 and one return channel 103 on the upper mold frame 2, and is connected to the corresponding water supply channel 102 and return channel 103. The coolant flow channel 101 is sealed to the water supply channel 102 and the return channel 103 to prevent coolant leakage. When the mold is in use, the water supply system and the return system are connected to an external coolant circulation system to achieve coolant circulation.

[0034] Reference Figure 3 and Figure 4A partition groove 42 is provided on the top of the female mold 4 and along the periphery of each injection hole 41. The partition groove 42 is formed on the female mold 4 by machining, and its shape is an arc groove or annular groove, which can effectively block the heat conduction path and reduce the impact of heat on the female mold 4 during injection molding. Each partition groove 42 corresponds to a water supply channel 102 and a return channel 103 on the upper mold frame 2, and the partition groove 42 is connected to the corresponding water supply channel 102. The female mold 4 is also provided with multiple water outlet channels 43, which correspond one-to-one with the partition grooves 42 and are connected to the bottom of the partition grooves 42. The water outlet channels 43 are connected to the corresponding return channels 103, and the water outlet channels 43 and the return channels 103 are sealed together. Through this arrangement, the coolant can flow in the partition groove 42, further improving the cooling effect around the injection hole 41.

[0035] Reference Figure 4 The partition groove 42 has multiple heat-conducting ports 421 on its sidewall near the injection port. These ports 421 are formed on the sidewall of the partition groove 42 by milling and are circular or square in shape. Each heat-conducting port 421 is distributed circumferentially around the injection port, and a heat-conducting block 422 is fixedly installed within each port 421. The heat-conducting block 422 is made of a highly thermally conductive metal material, such as copper or aluminum, which effectively conducts heat from around the injection port to the coolant within the partition groove 42, enhancing the cooling effect at the injection port location. The heat-conducting block 422 is fixed within the heat-conducting port 421 by welding or bonding to ensure good thermal conductivity.

[0036] Refer to Figure 5 The female mold 4 is provided with several vent holes 44, which are formed by drilling and have a diameter controlled between 0.8-1mm. The upper mold base 2 is provided with a vacuum air passage system, which is connected to each vent hole 44. Before injection molding, the air in the molding cavity 100 is expelled, creating negative pressure, which can effectively prevent defects such as weld lines, bubbles, and dents on the molded product caused by poor venting. The placement of the vent holes 44 is carefully designed to cover the entire molding cavity 100, ensuring effective venting.

[0037] Reference Figure 5Specifically, the vacuum air path system includes a negative pressure chamber 45 located at the top of the mother mold 4, an exhaust groove 21 on the upper mold frame 2 for connecting the negative pressure chamber 45, and an air passage 22 on the upper mold frame 2 that communicates with the exhaust groove 21. The negative pressure chamber 45 is formed by casting or machining, and each exhaust hole 44 communicates with the negative pressure chamber 45. The exhaust groove 21 is formed on the upper mold frame 2 by milling. An annular sealing groove is provided on the bottom wall of the upper mold frame 2 along the circumference of the exhaust groove 21, and a sealing ring 23 is fixedly installed in the annular sealing groove. The sealing ring 23 is made of rubber material and has good sealing performance to prevent gas leakage.

[0038] Reference Figure 5 A pneumatic piston block 46 is slidably disposed within the negative pressure chamber 45. The pneumatic piston block 46 is made of metal and its shape is adapted to the negative pressure chamber 45, allowing it to slide freely within the chamber. A stop pin 461 is fixedly disposed on the bottom wall of the pneumatic piston block 46. The stop pin 461 is made of metal rod and its diameter is adapted to the exhaust hole 44. The stop pin 461 corresponds one-to-one with the exhaust hole 44, slidably passing through the corresponding exhaust hole 44 and serving to seal the corresponding exhaust hole 44. The upper mold frame 2 is provided with a driving component 24 for driving the pneumatic piston block 46 to slide. The driving component 24 can be a cylinder or an electric push rod, etc., capable of precisely controlling the sliding of the pneumatic piston block 46.

[0039] Reference Figure 5 Each vent 44 has a side flow channel 441 on its side wall, and each side flow channel 441 is connected to the negative pressure chamber 45. The pneumatic piston block 46 has a vent 462. During the injection molding process, the driving component 24 drives the pneumatic piston block 46 to slide, causing the stop pin 461 to close the corresponding vent 44, which can prevent the injection molding material from entering the vent 44 and causing blockage. When venting is required, the driving component 24 drives the pneumatic piston block 46 to slide upward, so that the side flow channel 441 is connected to the corresponding vent 44. Combined with the vent 462 on the pneumatic piston block 46, a channel is provided for gas flow.

[0040] Reference Figure 5An air-blocking plug 47 is slidably inserted into the vent 462. The air-blocking plug 47 is made of metal and its shape is adapted to fit the vent 462, allowing it to slide freely within the vent 462. The air-blocking plug 47 is hollow, and a baffle 471 is fixedly installed at its bottom end. The baffle 471 is integrally formed with the air-blocking plug 47. The baffle 471 is used to abut against the bottom wall of the pneumatic piston block 46, and a rubber sealing gasket is provided on the top of the baffle 471. A vent hole 472 is opened on the side wall of the air-blocking plug 47. The vent hole 472 is formed on the side wall of the air-blocking plug 47 by drilling, and its diameter is designed according to the gas flow rate. A guide rod is fixedly installed on the bottom wall of the pneumatic piston block 46, and a baffle 471 is slidably sleeved on the guide rod. A limit block is fixedly installed at the bottom end of the guide rod. An elastic element 463 is installed on the pneumatic piston block 46. The elastic element 463 can be a spring. The spring is sleeved on the guide rod, and the two ends of the spring abut against the limit block and the baffle 471 respectively, for driving the baffle 471 to slide towards the bottom wall of the pneumatic piston block 46.

[0041] Reference Figure 5 A top cylinder 25, made of metal tubing, is fixedly installed inside the exhaust groove 21 and connects to the air passage 22. The outer wall at the bottom of the top cylinder 25 has a beveled insertion surface along its circumference. The inner wall at the top of the air baffle 47 has a groove that matches the beveled insertion surface. When the top cylinder 25 abuts against the air baffle 47, the beveled insertion surface and groove work together to allow the air baffle 47 to slide away from the pneumatic piston block 46, connecting the upper and lower sides of the pneumatic piston block 46 through the vent holes 472 on the air baffle 47.

[0042] During product injection molding, when the drive component 24 drives the pneumatic piston block 46 downward, the stop pin 461 closes the corresponding vent hole 44, the air stop plug 47 separates from the top cylinder 25, and the baffle 471 on the air stop plug 47 presses against the bottom end of the pneumatic piston block 46 under the elastic force of the elastic component 463, thereby sealing the space below the pneumatic piston block 46 and preventing air leakage. When venting is required, as the pneumatic piston block 46 slides upward, the top cylinder 25 abuts against the air stop plug 47 and pushes the air stop plug 47 to slide on the pneumatic piston block 46, connecting the space above and below the pneumatic piston block 46 to form a gas flow channel.

[0043] The implementation principle of an injection mold according to an embodiment of this application is as follows: Through the synergistic effect of structures such as the mesh coolant flow channel 101, the multi-channel system, the partition groove 42, the heat-conducting block 422, and the vacuum air circuit system, the injection mold achieves efficient injection molding of the product. The mesh coolant flow channel 101 and the multi-channel system ensure uniform flow and efficient cooling of the coolant, improving the cooling speed and uniformity of the product and reducing quality problems such as warpage and shrinkage marks. The partition groove 42 and the heat-conducting block 422 enhance the cooling effect around the injection hole 41, further improving product quality. The vacuum air circuit system avoids defects such as weld lines and bubbles in the product by venting and preventing the injection material from clogging the vent holes 44. These improvements improve the injection molding quality and production efficiency, reduce production costs, and significantly improve and contribute to existing injection mold technology.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection mold, comprising a lower mold base (1), an upper mold base (2), a male mold (3), and a female mold (4), characterized in that: The male mold (3) and female mold (4) are each provided with multiple coolant channels (101). Each coolant channel (101) is independently provided and arranged in a mesh pattern, and is evenly distributed around the molding cavity (100). Both the upper mold frame (2) and the lower mold frame (1) are equipped with a water supply system and a return water system. The water supply system and the return water system on the upper mold frame (2) are respectively connected to the coolant channels (101) on the female mold (4); the water supply system and the return water system on the lower mold frame (1) are respectively connected to the coolant channels (101) on the male mold (3). The mother mold (4) is provided with an exhaust hole (44) that communicates with the forming cavity (100), and the upper mold frame (2) is provided with a vacuum air passage system that communicates with the exhaust hole (44). The vacuum air circuit system includes a negative pressure chamber (45) set at the top of the mother mold (4), an exhaust groove (21) set on the upper mold frame (2) for communicating with the negative pressure chamber (45), and an air passage (22) set on the upper mold frame (2) and communicating with the exhaust groove (21). Each of the exhaust holes (44) is communicating with the negative pressure chamber (45). The bottom wall of the upper mold frame (2) is provided with an annular sealing groove along the circumference of the exhaust groove (21). A sealing ring (23) is fixedly set in the annular sealing groove. A pneumatic piston block (46) is slidably disposed in the negative pressure chamber (45). A plurality of stop pins (461) are fixedly disposed on the bottom wall of the pneumatic piston block (46). The stop pins (461) correspond one-to-one with the exhaust holes (44). The stop pins (461) are slidably disposed in the corresponding exhaust holes (44) and are used to close the corresponding exhaust holes (44). The upper mold frame (2) is provided with a driving member (24) for driving the pneumatic piston block (46) to slide. The side wall of each exhaust hole (44) is provided with a side flow channel (441), and each side flow channel (441) is connected to the negative pressure chamber (45). A vent (462) is opened on the pneumatic piston block (46). An air-blocking plug (47) is slidably inserted into the vent (462). The air-blocking plug (47) is adapted to the vent (462). The air-blocking plug (47) is hollow. A baffle (471) is fixedly installed at the bottom end of the air-blocking plug (47) and is used to abut against the bottom wall of the pneumatic piston block (46). A vent hole (472) is opened on the side wall of the air-blocking plug (47). An elastic element (463) is provided on the pneumatic piston block (46) to drive the baffle (471) to slide closer to the bottom wall of the pneumatic piston block (46). A top cylinder (25) is fixedly installed in the exhaust groove (21). The top cylinder (25) is connected to the air passage (22). The top cylinder (25) is used to abut against the air-blocking plug (47) and push the air-blocking plug (47) to slide away from the pneumatic piston block (46).

2. The injection mold according to claim 1, characterized in that: The top of the master mold (4) and along the periphery of each injection hole (41) are respectively provided with partition grooves (42).

3. The injection mold according to claim 2, characterized in that: The water supply system on the upper mold frame (2) is also connected to each of the partition grooves (42). The mother mold (4) is provided with multiple water outlet channels (43). The water outlet channels (43) correspond one-to-one with the partition grooves (42), and the water outlet channels (43) are connected to the partition grooves (42) near the bottom. The return water system on the upper mold frame (2) is connected to each water outlet channel (43) on the mother mold (4).

4. The injection mold according to claim 3, characterized in that: The partition groove (42) has multiple heat-conducting ports (421) connected to the injection port on the side wall near the injection port. Each heat-conducting port (421) is distributed circumferentially along the injection port, and each heat-conducting port (421) is fixedly provided with a heat-conducting block (422).

5. The injection mold according to claim 1, characterized in that: The exhaust port (44) is provided in multiple ways, and the diameter of the exhaust port (44) is controlled between 0.8-1mm.

6. The injection mold according to claim 1, characterized in that: The outer side wall at the bottom of the top cylinder (25) is provided with an insertion slope along the circumference of the top cylinder (25), and the inner side wall at the top of the air baffle (47) is provided with an insertion groove adapted to the insertion slope along the circumference of the air baffle (47).

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