Vacuum air passage structure of automobile steering wheel safety air bag mold

Abstract

The utility model discloses a vacuum air passage structure of an automobile steering wheel safety air bag mould, which comprises a fixed mould bottom plate, a cooling water pipe and an air pipe, the fixed mould bottom plate is connected with a fixed mould core, the top of the fixed mould core is provided with a movable mould core, the top of the movable mould core is connected with a movable mould top plate, and a convex mould is arranged at the center in the movable mould core. A male die is arranged in the fixed die core, a female die is arranged in the center in the fixed die core, a flow channel and an air channel are arranged in the male die and the female die respectively, and a plurality of groups of air pipes are arranged, are communicated with one another, are uniformly distributed in the movable die core and are used for exhausting air in a die cavity. And the vacuum generator is used for extracting air in the mold cavity, so that the problems that air in the mold is not discharged smoothly, and air pressure distribution is not uniform are effectively solved. Therefore, the defects of wrinkles, non-uniform thickness, uneven surface and the like of the safety air bag after injection molding are avoided, and the appearance quality and the structural stability of the safety air bag are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of airbag mold technology, specifically relating to a vacuum channel structure for an automotive steering wheel airbag mold. Background Technology

[0002] In automotive passive safety systems, airbags are key components that protect the lives of drivers and passengers, and automotive steering wheel airbags are manufactured by injection molding using airbag molds.

[0003] In existing automotive steering wheel airbag molds, during the injection molding process, the plastic may remain in the mold for too long, potentially undergoing thermal decomposition and producing various gases. If these gases cannot be properly expelled or the air pressure distribution is uneven, the resulting airbag may exhibit defects such as wrinkles, uneven thickness, and surface roughness, affecting its deployment performance and reliability. Furthermore, during rapid airbag molding, if air cannot be effectively and promptly expelled from the mold cavity, residual air can create air resistance, hindering material flow and filling, thereby reducing production efficiency and increasing the scrap rate. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum passage structure for an automotive steering wheel airbag mold, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum passage structure for an automotive steering wheel airbag mold, comprising:

[0006] A fixed mold base plate is provided, on which a fixed mold core is connected. A movable mold core is provided on the top of the fixed mold core and a movable mold top plate is connected to the top of the movable mold core. A punch is provided at the center of the movable mold core, and a die is provided at the center of the fixed mold core. A flow channel and an air channel are respectively provided in the punch and the die.

[0007] The cooling water pipes are provided in several groups and are interconnected and respectively located in the fixed mold core and the moving mold core, for cooling the airbag mold after injection molding.

[0008] The air pipes are provided in several groups, and the groups of air pipes are interconnected and evenly distributed in the moving mold core, for the purpose of venting the air inside the mold cavity.

[0009] Preferably, the fixed mold core is provided with a vacuum generator and one end of the vacuum generator is connected to one of the sets of air pipes. Both the fixed mold core and the moving mold core are provided with water distribution blocks and the water distribution blocks are provided with several cooling water connectors for connecting to cooling water pipes.

[0010] Preferably, the moving mold core surface is provided with a flow channel regulating valve located within the flow channel, and the punch is provided with an inclined ejector and a straight ejector.

[0011] Preferably, the surface of the moving mold core is connected to several guide posts, and a control system terminal box is provided on one side of the moving mold core.

[0012] Preferably, both the fixed mold core and the moving mold core are provided with lifting rings on their surfaces.

[0013] Preferably, the fixed mold core is provided with a hot runner junction box and a needle valve air circuit connector, and the fixed mold core is provided with a needle valve hot nozzle on the side of the die cavity.

[0014] Preferably, a thermometer is provided inside the fixed mold core, and several guide sleeves are also provided inside the fixed mold core with guide posts inserted into the guide sleeves.

[0015] Preferably, the fixed mold core is provided with a locking module.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) By evenly distributing several interconnected air pipes within the moving mold core and using a vacuum generator to extract air from the mold cavity, the problems of poor gas discharge and uneven air pressure distribution within the mold are effectively solved. This prevents defects such as wrinkles, uneven thickness, and uneven surface from appearing in the injection-molded airbag, greatly improving the appearance quality and structural stability of the airbag.

[0018] (2) Multiple sets of interconnected cooling water pipes are set up and reasonably distributed in the fixed mold core and the moving mold core, which can quickly and evenly cool the airbag mold after injection molding. Through the water distribution block and cooling water connector, the cooling water flow direction and flow rate can be flexibly adjusted to accurately control the mold temperature, which helps the plastic melt to solidify and form quickly and evenly, further improving the molding quality and production efficiency of the airbag.

[0019] (3) The guide post is connected to the surface of the moving mold core and works with the guide sleeve inside the fixed mold core to ensure the accurate positioning of the moving mold and the fixed mold during the opening and closing process, thereby improving the stability and reliability of mold operation.

[0020] (4) The flow channel regulating valve located on the surface of the moving mold core inside the flow channel can flexibly adjust the flow rate and flow of the plastic melt in the flow channel according to actual production needs, so as to achieve precise control of the injection molding process and further improve the molding quality of the airbag. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the moving mold core of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the fixed mold core of this utility model.

[0024] In the diagram: 1. Fixed mold base plate; 2. Fixed mold core; 3. Moving mold core; 4. Moving mold top plate; 5. Punch; 6. Die; 7. Runner; 8. Air passage; 9. Cooling water pipe; 10. Air pipe; 11. Vacuum generator; 12. Water divider; 13. Cooling water connector; 14. Runner regulating valve; 15. Angled ejector; 16. Straight ejector; 17. Guide post; 18. Control system terminal box; 19. Lifting ring; 20. Hot runner junction box; 21. Needle valve hot nozzle; 22. Thermometer; 23. Guide sleeve; 24. Locking module; 25. Needle valve air passage connector. Detailed Implementation

[0025] 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.

[0026] This utility model provides, for example Figure 1-3 The vacuum passage structure of a car steering wheel airbag mold shown includes:

[0027] A fixed mold base plate 1 is provided, and a fixed mold core 2 is connected to the fixed mold base plate 1. A movable mold core 3 is provided on the top of the fixed mold core 2 and a movable mold top plate 4 is connected to the top of the movable mold core 3. A punch 5 is provided at the center of the movable mold core 3 and a die 6 is provided at the center of the fixed mold core 2. A flow channel 7 and an air channel 8 are respectively provided in the punch 5 and the die 6.

[0028] Cooling water pipe 9, wherein the cooling water pipe 9 is provided in several groups and the several groups of cooling water pipe 9 are interconnected and respectively located in the fixed mold core 2 and the moving mold core 3, for cooling the airbag mold after injection molding;

[0029] Air pipe 10, the air pipe 10 is provided in several groups and the several groups of air pipe 10 are interconnected and evenly distributed in the moving mold core 3, for the purpose of venting the air inside the mold cavity.

[0030] The fixed mold core 2 is equipped with a vacuum generator 11, and one end of the vacuum generator 11 is connected to one of the air pipes 10. Both the fixed mold core 2 and the moving mold core 3 are equipped with water distribution blocks 12, and the water distribution blocks 12 are equipped with several cooling water connectors 13 for connecting to the cooling water pipes 9.

[0031] The moving mold core 3 is provided with a flow channel regulating valve 14 on its surface and located in the flow channel 7. The punch 5 is provided with an inclined ejector 15 and a straight ejector 16. Through the flow channel regulating valve 14, the flow channel corresponding to each cavity can be adjusted individually to keep the flow speed and pressure of the plastic melt in each cavity balanced, thereby ensuring that the products produced by each cavity are of consistent quality and reducing problems such as product size deviation and appearance difference caused by flow imbalance.

[0032] The surface of the moving mold core 3 is connected to several guide posts 17, and a control system terminal box 18 is provided on one side of the moving mold core 3.

[0033] Both the fixed mold core 2 and the moving mold core 3 are equipped with lifting rings 19, which can be used to accurately lift the mold to the designated position with the help of lifting equipment.

[0034] The fixed mold core 2 is provided with a hot runner junction box 20 and a needle valve air passage connector 25, and the fixed mold core 2 is provided with a needle valve type hot nozzle 21 on one side of the concave mold 6.

[0035] The fixed mold core 2 is equipped with a thermometer 22. The fixed mold core 2 is also equipped with several guide sleeves 23 and guide posts 17 are inserted into the guide sleeves 23. During the mold opening and closing process, the guide posts 17 are inserted into the guide sleeves 23 to provide precise guidance for the relative movement of the moving mold and the fixed mold, ensuring that the moving mold and the fixed mold can accurately close and separate each time the mold is opened and closed, avoiding mold misalignment and ensuring the molding accuracy of the product.

[0036] The fixed mold core 2 is equipped with a locking module 24. When the mold is closed, the locking module 24 is located behind the slider on the surface of the moving mold core 3 and abuts against the slider. During the injection process, the slider will be subjected to injection pressure. If there is no locking module 24, the slider may be displaced backward, which will affect the dimensional accuracy of the injection molded part. The locking module 24 provides a reverse force to effectively prevent the slider from moving backward, ensuring the dimensional stability and accuracy requirements of the injection molded part.

[0037] The vacuum channel structure of this automotive steering wheel airbag mold involves the operator first installing the mold onto the injection molding machine before injection molding begins. Using the lifting rings 19 on the surfaces of the fixed mold core 2 and the moving mold core 3, the mold is precisely lifted to the designated position with the aid of lifting equipment and connected and fixed to the corresponding components of the injection molding machine. Then, the parameters of each part of the mold are set through the control system terminal box 18. For example, based on the characteristics of the plastic raw material and the requirements of the airbag product, the working power of the vacuum generator 11 is set to control the pumping rate and vacuum level, and the water flow speed and temperature of the cooling water pipe 9 are adjusted to ensure that the cooling effect meets the production process requirements. Simultaneously, the plastic... The raw material is connected to the mold through the hot runner junction box 20 to ensure that the raw material can smoothly enter the runner 7. When the injection molding machine is started, the plastic raw material is heated and plasticized into a high temperature and high pressure melt under the push of the screw. The melt enters the runner 7 in the fixed mold core 2 from the hot runner junction box 20, and then is injected into the mold cavity through the needle valve hot nozzle 21. The needle valve air circuit connector 25 controls the opening and closing of the needle valve hot nozzle 21 to precisely adjust the injection volume and injection speed of the melt. When the melt flows through the runner 7 on the surface of the moving mold core 3, the runner regulating valve 14 flexibly adjusts the flow rate and flow of the melt at different positions in the runner according to the preset program to ensure that the melt fills the entire cavity evenly and quickly.

[0038] While the melt is being injected, the vacuum generator 11 starts working. It is connected to the air pipe 10 to extract the air from inside the mold cavity. Since several sets of air pipes 10 are interconnected and evenly distributed inside the moving mold core 3, they can fully cover the cavity and quickly and efficiently discharge the air, creating a negative pressure environment inside the cavity. This effectively avoids air residue forming air resistance, ensures that the melt flows smoothly and fills every corner of the cavity, and reduces product defects caused by gas problems.

[0039] During the injection molding process, the thermometer 22 inside the mold monitors the mold temperature in real time. Once the temperature exceeds or falls below the preset range, the thermometer 22 sends a signal back to the control system terminal box 18. Based on the feedback information, the control system automatically adjusts the water flow speed and flow rate in the cooling water pipe 9. The cooling water pipes 9 in the fixed mold core 2 and the moving mold core 3 are connected to each other, and the water flow is reasonably distributed through the water distribution block 12 and the cooling water connector 13 to ensure uniform cooling of the mold and provide a stable solidification environment for the plastic melt.

[0040] After injection molding, the cooling water pipe 9 continues to work to further cool the mold, promoting the complete solidification of the airbag. After the cooling time reaches the set value, the moving mold ejector plate 4 is moved upward by external equipment to realize the mold opening action. During the mold opening process, the guide post 17 on the surface of the moving mold core 3 slides along the guide sleeve 23 in the fixed mold core 2 to ensure accurate positioning during the separation process of the moving mold and the fixed mold, and to prevent mold misalignment and damage. When the mold is opened to a certain extent, the inclined ejector 15 and the straight ejector 16 on the punch 5 move upward under the action of the ejection mechanism of the injection molding machine to eject the solidified airbag from the concave mold 6. The synergistic action of the inclined ejector 15 and the straight ejector 16 can effectively prevent the airbag from deforming or being damaged due to uneven force during the demolding process, ensuring that the product is completely ejected. Then, the subsequent product collection and mold cleaning work is carried out to prepare for the next round of injection molding production.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum passage structure for an automotive steering wheel airbag mold, characterized in that, include: A fixed mold base plate (1) is provided, and a fixed mold core (2) is connected to the fixed mold base plate (1). A movable mold core (3) is provided on the top of the fixed mold core (2), and a movable mold top plate (4) is connected to the top of the movable mold core (3). A punch (5) is provided at the center of the movable mold core (3), and a cavity (6) is provided at the center of the fixed mold core (2). A flow channel (7) and an air channel (8) are respectively provided in the punch (5) and the cavity (6). Cooling water pipe (9), the cooling water pipe (9) is provided in several groups and the several groups of cooling water pipe (9) are connected to each other and are respectively located in the fixed mold core (2) and the moving mold core (3) for cooling the airbag mold after injection molding; Air pipe (10), the air pipe (10) is provided with several groups and the several groups of air pipes (10) are interconnected and evenly distributed in the moving mold core (3) for venting the air inside the mold cavity.

2. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: The fixed mold core (2) is equipped with a vacuum generator (11) and one end of the vacuum generator (11) is connected to one of the air pipes (10). Both the fixed mold core (2) and the moving mold core (3) are equipped with water distribution blocks (12) and several cooling water connectors (13) for connecting to the cooling water pipes (9).

3. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: The moving mold core (3) is provided with a flow channel regulating valve (14) on its surface and located in the flow channel (7), and the punch (5) is provided with an inclined ejector (15) and a straight ejector (16).

4. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: The surface of the moving mold core (3) is connected to several guide posts (17), and a control system terminal box (18) is provided on one side of the moving mold core (3).

5. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: Both the fixed mold core (2) and the moving mold core (3) are provided with lifting rings (19).

6. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: The fixed mold core (2) is provided with a hot runner junction box (20) and a needle valve air circuit connector (25), and the fixed mold core (2) is provided with a needle valve type hot nozzle (21) on the side of the die (6).

7. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 4, characterized in that: The fixed mold core (2) is equipped with a thermometer (22), and the fixed mold core (2) is also equipped with several guide sleeves (23) and guide posts (17) are inserted into the guide sleeves (23).

8. The vacuum passage structure of an automotive steering wheel airbag mold according to claim 1, characterized in that: The fixed mold core (2) is equipped with a locking module (24).

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