Injection mold structure for PA6 thin-wall product
By introducing multiple cooling components, temperature sensors, and micro-diameter flow channels and multiple vent pipes into the injection mold of PA6 thin-walled products, the problems of uneven cooling, incomplete filling and air bubbles in the injection molding process of thin-walled products are solved, achieving efficient production and high-quality molding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-03-24
AI Technical Summary
In the injection molding process of 1mm thin-walled PA6 products, there are defects such as incomplete filling, air bubbles, shrinkage and warping. Traditional mold design cannot effectively solve these problems, resulting in unstable product quality and low production efficiency.
The mold structure design employs multiple cooling components and temperature sensors, combined with a micro-diameter flow channel and multiple vent pipes, to achieve flexible cooling and temperature control, uniform flow guidance, and efficient venting. By precisely controlling the layout of the cooling and venting holes, it ensures uniform cooling and complete material filling.
It improves the production efficiency and quality of thin-walled PA6 products, reduces warping and air bubbles, and ensures dimensional stability and filling effect.
Smart Images
Figure CN224028308U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PA6 injection mold technology, specifically to a PA6 thin-walled product injection mold structure. Background Technology
[0002] PA6 nylon plastic is a chemical substance. Due to its excellent mechanical properties, wear resistance and heat resistance, PA6 material is widely used in thin-walled products in the automotive, electronics, and home appliance industries. The production of PA6 nylon plastic products requires the use of injection molds.
[0003] However, in the injection molding process of 1mm thin-walled products, due to their thin-walled structure and poor material flow, defects such as incomplete filling, air bubbles, shrinkage, and warping are more prominent. Traditional mold design usually cannot effectively solve these problems in the injection molding process of thin-walled products, resulting in unstable product quality and low production efficiency. Therefore, how to solve the various technical problems that occur in the injection molding process of thin-walled PA6 products by optimizing mold design, and improve production efficiency and product quality, has become a technical challenge in current mold design. Utility Model Content
[0004] The purpose of this invention is to provide an injection mold structure for PA6 thin-walled products to solve the problem of inconvenient and inflexible cooling and temperature control mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a PA6 thin-walled product injection mold structure, including a mold frame, a lower mold installed at the bottom of the mold frame, a mold cavity inside the lower mold, a cooling chamber outside the mold cavity, a third cooling component installed on the four sides inside the cooling chamber, a third temperature sensor installed on the third cooling component, a second cooling component installed at the bottom of the cooling chamber, a second temperature sensor installed on the second cooling component, a hydraulic cylinder installed at the top of the mold frame, an upper mold installed at the output end of the hydraulic cylinder, a punch installed at the bottom of the upper mold, a first cooling component installed inside the punch, a first temperature sensor installed on the first cooling component, injection ports installed on both sides of the top of the upper mold, a small sprue installed at the bottom of the injection port, a first runner and a second runner respectively installed at the bottom of the small sprue, a controller installed on the right side of the mold frame, a second vent pipe installed at the end of the mold cavity, a first vent pipe installed at the end of the second vent pipe, and vents provided on both sides of the lower mold.
[0006] As a further technical solution of this utility model, the first cooling component, the second cooling component and the third cooling component all adopt a water-cooled structure, and the first cooling component, the second cooling component and the third cooling component are all electrically connected to the controller.
[0007] As a further technical solution of this utility model, the first temperature sensor is fitted to the inner wall of the punch, and the second and third temperature sensors are fitted to the outer wall of the mold cavity.
[0008] As a further technical solution of this utility model, the first flow channel and the second flow channel adopt a small diameter flow channel, and both the first flow channel and the second flow channel adopt an inclined slope.
[0009] As a further technical solution of this utility model, the drain ports of the first flow channel and the second flow channel are both connected to the inside of the mold cavity.
[0010] As a further technical solution of this utility model, two sets of small sprue outlets are provided, and the small sprue outlets are located on both sides inside the upper mold.
[0011] As a further technical solution of this utility model, the second exhaust pipe is provided with eight sets, and a filter plug is installed inside the second exhaust pipe.
[0012] As a further technical solution of this utility model, the end of the first exhaust pipe is connected to the exhaust port.
[0013] Compared with the prior art, the beneficial effects of this utility model are: the injection mold structure for PA6 thin-walled products not only realizes the functions of convenient and flexible cooling and temperature control, convenient uniform flow guidance, but also convenient venting.
[0014] (1) By setting a first cooling component, a first temperature sensor, a second temperature sensor, a second cooling component, a third temperature sensor, and a third cooling component, the second cooling component and the third cooling component are installed at the bottom of the mold cavity. The second temperature sensor and the third temperature sensor can measure the temperature of multiple areas of the mold in different zones. Then, the flow rate of water cooling in the cooling component is adjusted according to the temperature of the zone. The first temperature sensor can measure the temperature of the upper part of the mold. The first cooling component can cool the upper part separately. Multi-directional cooling ensures that the coolant can flow evenly through each part of the mold, avoiding warping and dimensional instability caused by uneven cooling. By accurately calculating the size and layout of the cooling channel, the cooling time and temperature distribution of each thin-walled part are consistent, ensuring that the mold maintains the best cooling state during the molding process, reducing cooling time and improving production efficiency.
[0015] (2) By setting up an upper mold, injection port, first runner, second runner and small gate, and by installing two sets of eccentric small gates for injection molding, it can effectively avoid the problem of insufficient filling caused by uneven flow channels during the filling process. Especially in the thin-walled part, the multi-flow channel structure of the first and second runners ensures smooth flow through reasonable design of the flow channel diameter, length and curvature, avoiding dead flow corners or incomplete filling caused by unreasonable flow channel design. Moreover, the flow channel diameter is small enough so that the material can quickly and evenly fill the entire thin-walled area, reduce the residence time of the material during injection, and reduce shrinkage and bubble problems.
[0016] (3) By setting a first exhaust pipe, a second exhaust pipe, an exhaust port and a filter plug, eight sets of second exhaust pipes are evenly arranged at the bottom of the mold cavity. The second exhaust pipe is a permeable exhaust groove. The second exhaust pipe is connected to the first exhaust pipe. The gas inside the second exhaust pipe can be discharged along the first exhaust pipe. By precisely controlling the number, position and size of the exhaust holes, it is ensured that the gas can be discharged quickly and the generation of bubbles is avoided. The design of the exhaust holes ensures that the gas can flow out smoothly, prevents the adverse effects caused by gas stagnation, and reduces the phenomenon of bubbles and voids caused by poor venting during injection molding. Attached Figure Description
[0017] Figure 1 This is a frontal cross-sectional view of the present invention.
[0018] Figure 2 This is a frontal cross-sectional view of the upper mold of this utility model;
[0019] Figure 3 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;
[0020] Figure 4 This is a partial front view of the second cooling component of this utility model.
[0021] In the diagram: 1. Mold frame; 2. Lower mold; 3. First vent pipe; 4. Cooling chamber; 5. Mold cavity; 6. Punch; 7. Upper mold; 8. Hydraulic cylinder; 9. Injection port; 10. First runner; 11. Second runner; 12. First cooling assembly; 13. First temperature sensor; 14. Second temperature sensor; 15. Second cooling assembly; 16. Second vent pipe; 17. Vent; 18. Controller; 19. Third temperature sensor; 20. Third cooling assembly; 21. Small sprue; 22. Filter plug. Detailed Implementation
[0022] 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.
[0023] Please see Figure 1-4 This utility model provides an embodiment of an injection mold structure for PA6 thin-walled products, including a mold frame 1, a lower mold 2 installed at the bottom of the mold frame 1, a mold cavity 5 inside the lower mold 2, a cooling chamber 4 outside the mold cavity 5, third cooling components 20 installed on the four sides inside the cooling chamber 4, a third temperature sensor 19 installed on the third cooling components 20, a second cooling component 15 installed at the bottom of the cooling chamber 4, a second temperature sensor 14 installed on the second cooling component 15, and a hydraulic cylinder 8 installed at the top of the mold frame 1. An upper mold 7 is installed at the output end, a punch 6 is installed at the bottom of the upper mold 7, a first cooling component 12 is installed inside the punch 6, a first temperature sensor 13 is installed on the first cooling component 12, injection ports 9 are installed on both sides of the top of the upper mold 7, a small sprue 21 is installed at the bottom of the injection port 9, a first flow channel 10 and a second flow channel 11 are respectively installed at the bottom of the small sprue 21, a controller 18 is installed on the right side of the mold frame 1, a second vent pipe 16 is installed at the end of the mold cavity 5, a first vent pipe 3 is installed at the end of the second vent pipe 16, and vent ports 17 are provided on both sides of the lower mold 2.
[0024] The first cooling assembly 12, the second cooling assembly 15 and the third cooling assembly 20 all adopt a water-cooled structure. The first cooling assembly 12, the second cooling assembly 15 and the third cooling assembly 20 are all electrically connected to the controller 18. The first temperature sensor 13 is fitted to the inner wall of the punch 6, and the second temperature sensor 14 and the third temperature sensor 19 are fitted to the outer wall of the mold cavity 5.
[0025] Specifically, such as Figure 1 , Figure 3 and Figure 4As shown, a second cooling assembly 15 and a third cooling assembly 20 are installed at the bottom of the cavity 5. The second temperature sensor 14 and the third temperature sensor 19 can measure the temperature of multiple areas of the mold in different zones. Then, the flow rate of water cooling in the cooling assembly is adjusted according to the temperature of the zone. The first temperature sensor 13 can measure the temperature of the upper part of the mold. The first cooling assembly 12 can cool the upper part separately. Multi-directional cooling ensures that the coolant can flow evenly through every part of the mold, avoiding warping and dimensional instability caused by uneven cooling. By accurately calculating the size and layout of the cooling channels, the cooling time and temperature distribution of each thin-walled part are ensured to be consistent.
[0026] The first flow channel 10 and the second flow channel 11 are small diameter flow channels. Both the first flow channel 10 and the second flow channel 11 are inclined slopes. The drain ports of the first flow channel 10 and the second flow channel 11 are connected to the inside of the mold cavity 5. Two sets of small gates 21 are provided. The small gates 21 are located on both sides inside the upper mold 7.
[0027] Specifically, such as Figure 1 and Figure 2 As shown, two sets of eccentric small sprue nozzles 21 are installed for injection molding, which can effectively avoid the problem of insufficient filling caused by uneven flow channels during the filling process. Especially in the thin-walled part, the multi-channel structure of the first flow channel 10 and the second flow channel 11 ensures smooth flow through reasonable design of flow channel diameter, length and curvature, avoiding flow dead corners or incomplete filling caused by unreasonable flow channel design. Moreover, the flow channel diameter is small enough so that the material can quickly and evenly fill the entire thin-walled area.
[0028] The second exhaust pipe 16 is provided with eight sets, and a filter plug 22 is installed inside the second exhaust pipe 16. The end of the first exhaust pipe 3 is connected to the exhaust port 17.
[0029] Specifically, such as Figure 1 As shown, eight sets of second exhaust pipes 16 are evenly arranged at the bottom of the mold cavity 5. The second exhaust pipe 16 is a permeable exhaust groove. The second exhaust pipe 16 is connected to the first exhaust pipe 3. The gas inside the second exhaust pipe 16 can be discharged through the first exhaust pipe 3. By precisely controlling the number, position and size of the exhaust holes, it is ensured that the gas can be discharged quickly and the generation of bubbles is avoided. The design of the exhaust holes ensures that the gas can flow out smoothly.
[0030] Working principle: At the beginning of injection molding, PA6 material needs to be injected with a lower injection pressure. The lower injection pressure ensures that the thin-walled area is filled first. As the injection process progresses, the injection pressure is gradually increased to ensure that the entire mold is completely filled, avoiding problems such as incomplete filling, air bubbles, and shrinkage. Two sets of eccentric small gates 21 are used for injection, which can effectively avoid the problem of insufficient filling caused by uneven flow channels during the filling process, especially in the thin-walled part. The multi-channel structure of the first flow channel 10 and the second flow channel 11, through reasonable design of the flow channel diameter, length and curvature, ensures smooth flow and avoids flow dead zones or incomplete filling caused by unreasonable flow channel design. During production, the bottom of the mold cavity 5 is equipped with a second cooling component 15 and a third cooling component 20. The second temperature sensor 14 and the third temperature sensor 19 can measure the temperature of multiple areas of the mold in different zones, and then the temperature of each zone is determined according to the temperature of the zone. The flow rate of water cooling in the cooling assembly is adjusted. The first temperature sensor 13 can measure the temperature of the upper part of the mold, and the first cooling assembly 12 can cool the upper part separately. Multi-directional cooling ensures that the coolant can flow evenly through every part of the mold, avoiding warping and dimensional instability caused by uneven cooling. By accurately calculating the size and layout of the cooling channels, the cooling time and temperature distribution of each thin-walled part are ensured to be consistent. Eight sets of second exhaust pipes 16 are evenly arranged at the bottom of the mold cavity 5. The second exhaust pipes 16 are permeable exhaust channels and are connected to the first exhaust pipe 3. The gas inside the second exhaust pipes 16 can be discharged along the first exhaust pipe 3. By accurately controlling the number, position and size of the exhaust holes, the gas can be discharged quickly to avoid the generation of bubbles. The design of the exhaust holes ensures that the gas can flow out smoothly, preventing the adverse effects caused by gas stagnation and reducing the phenomenon of bubbles and voids caused by poor venting during injection molding.
[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A PA6 thin-walled product injection mold structure, comprising a mold frame (1), characterized in that: A lower mold (2) is installed at the bottom of the mold frame (1). A mold cavity (5) is provided inside the lower mold (2). A cooling chamber (4) is provided outside the mold cavity (5). A third cooling assembly (20) is installed on the four sides of the cooling chamber (4). A third temperature sensor (19) is installed on the third cooling assembly (20). A second cooling assembly (15) is installed at the bottom of the cooling chamber (4). A second temperature sensor (14) is installed on the second cooling assembly (15). A hydraulic cylinder (8) is installed at the top of the mold frame (1). An upper mold (7) is installed at the output end of the hydraulic cylinder (8). The bottom of the upper mold (7) is equipped with... The mold is equipped with a punch (6), and a first cooling assembly (12) is installed inside the punch (6). A first temperature sensor (13) is installed on the first cooling assembly (12). Injection ports (9) are installed on both sides of the top of the upper mold (7). A small sprue (21) is installed at the bottom of the injection port (9). A first runner (10) and a second runner (11) are installed at the bottom of the small sprue (21). A controller (18) is installed on the right side of the mold frame (1). A second vent pipe (16) is installed at the end of the mold cavity (5). A first vent pipe (3) is installed at the end of the second vent pipe (16). Vents (17) are provided on both sides of the lower mold (2).
2. The PA6 thin-walled product injection mold structure according to claim 1, characterized in that: The first cooling component (12), the second cooling component (15) and the third cooling component (20) all adopt a water-cooled structure, and the first cooling component (12), the second cooling component (15) and the third cooling component (20) are all electrically connected to the controller (18).
3. The PA6 thin-walled product injection mold structure according to claim 1, characterized in that: The first temperature sensor (13) is fitted to the inner wall of the punch (6), and the second temperature sensor (14) and the third temperature sensor (19) are fitted to the outer wall of the mold cavity (5).
4. The PA6 thin-walled product injection mold structure according to claim 1, characterized in that: The first flow channel (10) and the second flow channel (11) are small diameter flow channels, and both the first flow channel (10) and the second flow channel (11) are inclined slopes.
5. The injection mold structure for PA6 thin-walled products according to claim 1, characterized in that: The drain ports of the first flow channel (10) and the second flow channel (11) are both connected to the inside of the mold cavity (5).
6. The PA6 thin-walled product injection mold structure according to claim 1, characterized in that: Two sets of small sprue nozzles (21) are provided, and the small sprue nozzles (21) are located on both sides inside the upper mold (7).
7. The injection mold structure for PA6 thin-walled products according to claim 1, characterized in that: The second exhaust pipe (16) is provided with eight sets, and a filter plug (22) is installed inside the second exhaust pipe (16).
8. The injection mold structure for PA6 thin-walled products according to claim 1, characterized in that: The end of the first exhaust pipe (3) is connected to the exhaust port (17).