A process for injection molding an automotive plug-in housing

Abstract

The application discloses a kind of automobile plug inner frame injection molding processes, it includes the following steps: step one, several copper pins are inserted into the lower mould of mould, and its one end is positioned in the lower mould;Step two, the upper die and the lower die are closed, at this time the other end of copper pin is inserted into the upper die, and the remaining part is located in the cavity;Step three, pouring injection liquid in the pouring port, injection liquid flows into the cavity to fill the cavity to form a bracket plate, at the same time, part of the injection liquid flows into the copper pin from the injection hole of the side wall of copper pin to fill the inside of copper pin, and part of the injection liquid in the copper pin penetrates the one end of copper pin in the lower mould to form a guide head;Step four, after cooling, open the mould, and the top plate moves up to eject the injection molded plug inner frame through the ejector rod.The beneficial effects of the present application are: it is beneficial to ensure the connection stability of the guide head and the copper pin with the bracket plate, improve the wear resistance of the guide head, and achieve the purpose of improving product quality.

Description

Technical Field

[0001] This invention relates to the technical field of plug inner frame, and in particular to an injection molding process for automotive plug inner frame. Background Technology

[0002] Plugs are widely used in connecting electrical appliances to power sources. As the electrical appliance industry develops, people's requirements for plugs are also getting higher and higher.

[0003] Existing plug inner frames include cylindrical pins and a support plate, which are connected together by a seal to form the plug inner frame. To reduce material consumption, weight, and costs, most pins in existing technologies use a hollow structure, with a guide head then assembled into the pin head. This results in low production efficiency. Furthermore, with this structure, repeated insertion and removal of the plug can easily cause the guide head and pins to loosen, compromising the connection stability and reducing the wear resistance of the guide head. Ultimately, this compromises product quality and reduces the product's lifespan. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of existing technologies in which the quality of the inner frame of the plug cannot be guaranteed, and provides an injection molding process for the inner frame of automotive plugs that is conducive to improving product quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An injection molding process for an automotive connector inner frame includes the following steps:

[0007] Step 1: Insert several copper tubes into the lower mold of the mold, positioning one end of each tube inside the lower mold.

[0008] Step 2: The upper mold and the lower mold are closed. At this time, the other end of the copper tube is inserted into the upper mold, and the rest is located in the mold cavity.

[0009] Step 3: Pour the injection molding liquid into the sprue. The injection molding liquid flows into the mold cavity and fills the mold cavity to form a support plate. At the same time, some of the injection molding liquid flows into the copper pin from the injection hole on the side wall of the copper pin to fill the inside of the copper pin. Some of the injection molding liquid in the copper pin passes through one end of the copper pin located in the lower mold and forms a guide head.

[0010] Step 4: After cooling, open the mold, and the top plate moves up to push out the injection-molded plug inner frame through the ejector pin.

[0011] The above-described single-injection molding process allows for the one-time molding of several copper pins, support plates, and guide heads. This simple process improves production efficiency and ensures a tight seal between the copper pins and the support plate. Simultaneously, as the injection molten metal flows into the mold cavity to fill it and form the support plate, some of the molten metal fills the inside of the copper pins, while some of the molten metal within the pins penetrates to one end of the pin within the lower mold to form the guide head. This ensures a stable connection between the guide head and the copper pins to the support plate, improves the wear resistance of the guide head, and ultimately enhances product quality and extends product lifespan.

[0012] Preferably, the plug inner frame includes a support plate and several copper pins. The support plate has several mounting holes that match the copper pins one by one. The support plate is integrally formed with the copper pins through the mounting holes by injection molding. The copper pins have a hollow internal structure and a mandrel is provided inside each copper pin. The mandrel has an injection hole on its side wall. The injection hole is located inside the mounting hole. The support plate is integrally formed with the mandrel through the injection hole. The mandrel and the copper pins are fixedly connected by injection molding. One end of the mandrel is located inside the end of the copper pin inserted into the upper mold. The two ends of a portion of the copper pins are connected. The other end of the mandrel passes through the end of this portion of the copper pin inserted into the lower mold and forms a guide head. The end of another portion of the copper pin inserted into the lower mold is sealed. The other end of the mandrel is located inside the end of this portion of the copper pin inserted into the lower mold. The injection hole facilitates the flow of molten plastic into the mold cavity during injection, with some of it flowing into the copper lead tube to form a mandrel. This improves production efficiency and strengthens the connection between the copper lead tube and the support plate. It also prevents the copper lead tube from deforming and allows it to withstand repeated insertion and removal from the hole. A portion of the molten plastic fills the inside of the copper lead tube, forming the mandrel, and then flows out to the end of the copper lead tube to form a guide head. This integrates the guide head, mandrel, copper lead tube, and support plate, ensuring a stable connection between them and the support plate. It also improves the wear resistance of the guide head, enhancing product quality and extending product lifespan.

[0013] Preferably, the side wall of the end of the copper pin inserted into the upper mold is recessed from the outside to the inside to form a wiring portion. The core rod is located on one side of the wiring portion, and a flared opening is provided on the opposite side of the wiring portion. The wiring portion is recessed from the outside to the inside, which on the one hand facilitates increasing the contact area between the core rod and the inside of the copper pin, thereby improving the injection molding strength, and on the other hand facilitates the soldering of the wire after it is inserted through the guiding effect of the flared opening.

[0014] Preferably, one end of the guide head forms a stepped surface with the sidewall of the mandrel, and one end of the guide head connects to the end of the copper pin through the stepped surface. The diameter of the guide head gradually decreases continuously from the end connected to the copper pin to the other end. The diameter of the guide head connected to the end of the copper pin is larger than the inner diameter of the copper pin and smaller than the outer diameter of the copper pin. This design of the guide head's diameter ensures good guidance for inserting the copper pin into the socket while also increasing the strength of the guide head. Simultaneously, the stepped surface connecting the guide head to the end of the copper pin allows the guide head and mandrel to be molded as a single unit, increasing the contact area between the guide head and the copper pin and improving the injection molding strength between them.

[0015] Preferably, the support plate has several raised rings on both its front and rear sides, each matching one-to-one with a copper pin. These raised rings communicate with corresponding mounting holes and are fixedly connected to the support plate via injection molding, forming a single unit. The raised rings further increase the contact area between the copper pin and the support plate, thereby further improving the connection strength between them.

[0016] Preferably, the mold includes an upper mold and a lower mold corresponding to the upper mold. The upper mold and the lower mold are closed to form a mold cavity. The upper mold is provided with a sprue, which is connected to the mold cavity. The lower mold is provided with a plurality of limiting grooves that match one end of a plurality of copper tubes. The opening end of the limiting groove is located inside the mold cavity. The bottom end of some limiting grooves is provided with an injection groove that matches a guide head. The upper mold is provided with a plurality of slots that match the other end of a plurality of copper tubes. The slot is provided with a stop post that matches the wiring part. The stop post is fixedly connected to the center of the slot. The slot is located inside the mold cavity. The mold cavity is located at the top of the lower mold. The bottom of the lower mold is provided with an ejector device that is slidably connected to the lower mold and corresponds to the mold cavity. The limiting groove facilitates the positioning of one end of the copper tube pin during injection molding, while the slot and stop post facilitate the positioning of the other end of the copper tube pin during injection molding. The stop post facilitates the formation of the mandrel on the side of the wiring part during injection molding, preventing the injection liquid from flowing into the wiring part. After the injection liquid fills the copper tube pin, it flows into the injection tank to form a guide head. The ejection device facilitates the ejection of the molded product from the mold, thereby facilitating the smooth demolding of the product.

[0017] Preferably, the gating gate is located at the top of the upper mold, and the mold cavity is located at the bottom of the upper mold. The upper mold has a first sprue, and the top of the lower mold has a second sprue. The gating gate is connected to the mold cavity through the first sprue and the second sprue in sequence. After the upper and lower molds are closed, the injection molding liquid is poured in through the gating gate and flows into the mold cavity through the first sprue and the second sprue in sequence, making the operation simple.

[0018] Preferably, there are two mold cavities, arranged horizontally around the second sprue. The gating gate is connected to the center of the second sprue via the first sprue, and both ends of the second sprue are connected to the two mold cavities respectively. When there are two mold cavities, the injection molding liquid is poured in through the gating gate and flows into the two mold cavities sequentially through the first and second sprues, which helps to improve product production efficiency. At the same time, the structural shapes of the two mold cavities can be set to be the same or different according to requirements.

[0019] Preferably, the lower mold has mold feet on both the left and right sides of its bottom, which are fixedly connected to the lower mold. The ejector device is located between the two mold feet and includes a base plate, a top plate, and several ejector rods. The left and right ends of the base plate are fixedly connected to the two mold feet, respectively. The top plate is located on the base plate and is slidably connected to the mold feet. The ejector rods are fixedly connected to the top plate and perpendicular to it. The mold cavity has several through holes that match the ejector rods one by one, and the through holes are located on the side of the limiting groove. The base plate facilitates the limiting of the top plate; during demolding, the driver drives the top plate to move upward, causing the ejector rods to pass through the through holes and eject the finished product from the mold cavity, thereby facilitating the smooth demolding of the finished product.

[0020] Preferably, the upper mold has several evenly distributed guide posts along its edge, one end of each guide post being fixedly connected to the upper mold. The lower mold has several guide grooves corresponding to the guide posts, and guide sleeves matching the guide posts are placed within the guide grooves. The upper mold is slidably connected up and down via the matching guide posts and guide sleeves. The cooperation between the guide posts and guide sleeves improves the fitting accuracy between the upper and lower molds, thereby improving product quality.

[0021] The beneficial effects of this invention are: the injection molding process is simple, which is conducive to improving the production efficiency of finished products and ensuring the sealing effect at the connection between the copper pin and the support plate; it is conducive to ensuring the connection stability between the guide head and the copper pin and the support plate, improving the wear resistance of the guide head, thereby improving product quality and extending product service life; the copper pin is not easily deformed and can withstand repeated insertion and removal from the socket; the wiring part is concave from the outside to the inside, which on the one hand facilitates increasing the contact area between the core rod and the inside of the copper pin, thereby improving the injection molding strength, and on the other hand facilitates the insertion of the wire through the flared end for soldering; the design of the guide head diameter provides good guidance for the insertion of the copper pin into the socket. Based on the existing design, the strength of the guide head is improved. Simultaneously, the guide head connects to the end of the copper pin via a stepped surface, integrating the guide head and mandrel into a single unit during injection molding. This increases the contact area between the guide head and the copper pin, enhancing the injection molding strength. The convex ring further expands the contact area between the copper pin and the support plate, further improving the connection strength between them. The limiting groove facilitates positioning of one end of the copper pin during injection molding, while the slot and stop facilitate positioning of the other end. The stop ensures the mandrel can be formed on the side of the connection point during injection molding, preventing injection fluid from flowing into the connection point. This facilitates smooth demolding and improves the fitting accuracy between the upper and lower molds. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the mold structure during mold opening;

[0024] Figure 3 yes Figure 1 Top view;

[0025] Figure 4 yes Figure 3 Sectional view of AA;

[0026] Figure 5 This is a schematic diagram of the internal structure of the plug;

[0027] Figure 6 yes Figure 5 Exploded view.

[0028] In the diagram: 1. Support plate, 2. Copper pin, 3. Mounting hole, 4. Mandrel, 5. Injection hole, 6. Guide head, 7. Wiring part, 8. Bell mouth, 9. Stepped surface, 10. convex ring, 11. Upper mold, 12. Lower mold, 13. Mold cavity, 14. Sprue, 15. Limiting groove, 16. Injection groove, 17. Slot, 18. Stop post, 19. Ejector device, 20. Sprue 1, 21. Sprue 2, 22. Mold foot, 23. Base plate, 24. Top plate, 25. Ejector rod, 26. Guide post, 27. Guide groove. Implementation

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 In the described embodiment, an injection molding process for an automotive plug inner frame includes the following steps:

[0031] Step 1: Insert several copper tubes 2 into the lower mold 12 of the mold, so that one end of them is positioned inside the lower mold 12.

[0032] Step 2: The upper mold 11 and the lower mold 12 are closed. At this time, the other end of the copper tube 2 is inserted into the upper mold 11, and the rest is located in the mold cavity 13.

[0033] Step 3: Pour the injection molding liquid into the sprue 14. The injection molding liquid flows into the mold cavity 13 and fills the mold cavity 13 to form the support plate 1. At the same time, part of the injection molding liquid flows into the copper pin 2 from the injection hole 5 on the side wall of the copper pin 2 to fill the interior of the copper pin 2. Part of the injection molding liquid in the copper pin 2 passes through one end of the copper pin 2 located in the lower mold 12 and forms the guide head 6.

[0034] Step 4: After cooling, open the mold, and the top plate 24 moves up to push out the injection-molded plug inner frame through the ejector rod 25.

[0035] like Figure 5 and Figure 6As shown, the plug inner frame includes a support plate 1 and several copper pins 2. The support plate 1 has several mounting holes 3 that match the copper pins 2 one by one. The support plate 1 is integrally formed with the copper pins 2 through the mounting holes 3. The copper pins 2 have a hollow internal structure and a core rod 4 is provided inside the copper pin 2. The core rod 4 has an injection hole 5 on its side wall. The injection hole 5 is located inside the mounting hole 3. The support plate 1 is integrally formed with the core rod 4 through the injection hole 5. The core rod 4 and the copper pins 2 are fixedly connected by injection molding. One end of the core rod 4 is located in the end of the copper pin 2 inserted into the upper mold 11. The two ends of a portion of the copper pins 2 are connected. The other end of the core rod 4 passes through the end of this portion of the copper pins 2 inserted into the lower mold 12 and forms a guide head 6. The end of another portion of the copper pins 2 inserted into the lower mold 12 is sealed. The other end of the core rod 4 is located in the end of this portion of the copper pins 2 inserted into the lower mold 12.

[0036] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the copper tube pin 2 is inserted into the upper mold 11. One end of the side wall is recessed from the outside to the inside to form a wiring part 7. The core rod 4 is located on one side of the wiring part 7, and the other side of the wiring part 7 is provided with a flared mouth 8.

[0037] like Figure 5 and Figure 6 As shown, a stepped surface 9 is formed between one end of the guide head 6 and the side wall of the core rod 4. One end of the guide head 6 is connected to the end of the copper pin 2 through the stepped surface 9. The diameter of the guide head 6 gradually decreases continuously from the end connected to the end of the copper pin 2 to the other end. The diameter of the guide head 6 connected to the end of the copper pin 2 is greater than the inner diameter of the copper pin 2 and smaller than the outer diameter of the copper pin 2.

[0038] like Figure 5 and Figure 6 As shown, the front and rear sides of the bracket plate 1 are provided with several protruding rings 10 that match the copper pins 2 one by one. The protruding rings 10 are connected to the corresponding mounting holes 3 and are fixedly connected to the bracket plate 1 by injection molding to form an integral part.

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the mold includes an upper mold 11 and a lower mold 12 that corresponds to the upper mold 11 vertically. The upper mold 11 and the lower mold 12 are closed to form a mold cavity 13. The upper mold 11 is provided with a sprue 14, which is connected to the mold cavity 13. The lower mold 12 is provided with a number of limiting grooves 15 that match one end of a number of copper tube pins 2. The opening end of the limiting groove 15 is located inside the mold cavity 13. The bottom end of some of the limiting grooves 15 is provided with an injection groove 16 that matches the guide head 6. The upper mold 11 is provided with a number of slots 17 that match the other end of a number of copper tube pins 2. The slots 17 are provided with mold pillars 18 that match the wiring part 7. The mold pillars 18 are fixedly connected to the center of the slots 17. The slots 17 are located inside the mold cavity 13. The mold cavity 13 is located at the top of the lower mold 12. The bottom of the lower mold 12 is provided with an ejector device 19, which is slidably connected to the lower mold 12 and corresponds to the mold cavity 13.

[0040] like Figure 4 As shown, the sprue 14 is located at the top of the upper mold 11, and the mold cavity 13 is located at the bottom of the upper mold 11. The upper mold 11 is provided with a first sprue 20, and the top of the lower mold 12 is provided with a second sprue 21. The sprue 14 is connected to the mold cavity 13 through the first sprue 20 and the second sprue 21 in sequence.

[0041] like Figure 2 and Figure 4 As shown, there are two mold cavities 13, which are distributed to the left and right with the second sprue 21 as the center. The sprue 14 is connected to the center of the second sprue 21 through the first sprue 20. The two ends of the second sprue 21 are connected to the two mold cavities 13 respectively.

[0042] like Figure 1 , Figure 2 and Figure 4 As shown, the lower mold 12 has mold feet 22 on both the left and right sides of its bottom. The mold feet 22 are fixedly connected to the lower mold 12. The ejector device 19 is located between the two mold feet 22. The ejector device 19 includes a base plate 23, a top plate 24 and several ejector rods 25. The left and right ends of the base plate 23 are fixedly connected to the two mold feet 22 respectively. The top plate 24 is located on the base plate 23 and is slidably connected to the mold feet 22. The ejector rods 25 are fixedly connected to the top plate 24 and are perpendicular to the top plate 24. The mold cavity 13 has several through holes that match the ejector rods 25 one by one. The through holes are located on the side of the limiting groove 15.

[0043] like Figure 2 As shown, the upper mold 11 has several evenly distributed guide posts 26 on its edge. One end of the guide post 26 is fixedly connected to the upper mold 11. The lower mold 12 has several guide grooves 27 that correspond one-to-one with the guide posts 26. The guide grooves 27 are equipped with guide sleeves that match the guide posts 26. The upper mold 11 is slidably connected up and down through the guide posts 26 and the guide sleeves that match one-to-one.

[0044] The number of mold cavities 13 can be one, two or more. When there are two mold cavities 13, the injection liquid is poured in through the gating port 14 and flows into the two mold cavities 13 in sequence through the first gating 20 and the second gating 21 for injection molding, which helps to improve product production efficiency. At the same time, the structural shapes of the two mold cavities 13 can be set to be the same or different according to the requirements. The injection molding process integrates several copper pins 2, support plate 1, mandrel 4, and guide head 6 into one unit, which improves production efficiency and ensures a good seal at the connection between the copper pins 2 and support plate 1. Simultaneously, as the injection molten metal flows into and fills the mold cavity 13 to form the support plate 1, some of the molten metal flows through the injection hole 5 and fills the interior of the copper pins 2, increasing their strength and making them more resistant to repeated insertion and removal from the insertion hole. A portion of the molten metal in the copper pins 2 passes through one end of the copper pin 2 located in the lower mold and enters the injection groove 16 to form the guide head 6. This ensures the stable connection between the guide head 6 and the copper pins 2 and the support plate 1, improves the wear resistance of the guide head 6, and ultimately enhances product quality and extends product lifespan.

Claims

1. An injection molding process for the inner frame of an automotive plug, characterized in that, Includes the following steps: Step 1: Insert several copper tubes (2) into the lower mold (12) of the mold, so that one end of them is positioned inside the lower mold (12); Step 2: The upper mold (11) and the lower mold (12) are closed. At this time, the other end of the copper tube (2) is inserted into the upper mold (11), and the rest is located in the mold cavity (13). Step 3: Pour the injection molding liquid into the sprue (14). The injection molding liquid flows into the mold cavity (13) and fills the mold cavity (13) to form the support plate (1). At the same time, part of the injection molding liquid flows into the copper pin (2) from the injection hole (5) on the side wall of the copper pin (2) to fill the inside of the copper pin (2). Part of the injection molding liquid in the copper pin (2) passes through one end of the copper pin (2) located in the lower mold (12) and forms the guide head (6). Step 4: After cooling, open the mold. The top plate (24) moves upward and pushes out the injection-molded plug inner frame through the ejector rod (25). The plug inner frame includes a support plate (1) and several copper tubes (2). The support plate (1) is provided with several mounting holes (3) that match the copper tubes (2). The support plate (1) is injection molded to form an integral part with the copper tubes (2) through the mounting holes (3). The copper tubes (2) have a hollow internal structure. The copper tubes (2) are provided with a core rod (4) and injection holes (5) on their side walls. The injection holes (5) are located inside the mounting holes (3). The support plate... (1) The core rod (4) is injection molded into a single unit through the injection hole (5). The core rod (4) and the copper pin (2) are fixedly connected by injection molding. One end of the core rod (4) is located inside the end of the copper pin (2) inserted into the upper mold (11). The two ends of a portion of the copper pin (2) are connected. The other end of the core rod (4) passes through the end of the copper pin (2) inserted into the lower mold (12) to form a guide head (6). The end of the other portion of the copper pin (2) inserted into the lower mold (12) is sealed. The other end of the core rod (4) is located inside the end of the copper pin (2) inserted into the lower mold (12).

2. The injection molding process for an automotive plug inner frame according to claim 1, characterized in that, The copper pin (2) is inserted into the upper mold (11). One end of the side wall is recessed from the outside to the inside to form a wiring part (7). The core rod (4) is located on one side of the wiring part (7). The other side of the wiring part (7) is provided with a flared mouth (8).

3. The injection molding process for an automotive plug inner frame according to claim 1, characterized in that, One end of the guide head (6) forms a stepped surface (9) between it and the side wall of the core rod (4). One end of the guide head (6) is connected to the end of the copper pin (2) through the stepped surface (9). The diameter of the guide head (6) gradually decreases continuously from the end connected to the end of the copper pin (2) to the other end. The diameter of the guide head (6) connected to the end of the copper pin (2) is greater than the inner diameter of the copper pin (2) and smaller than the outer diameter of the copper pin (2).

4. The injection molding process for an automotive plug inner frame according to claim 1, 2, or 3, characterized in that, The front and rear sides of the bracket plate (1) are provided with several protruding rings (10) that match the copper pins (2) one by one. The protruding rings (10) are connected to the corresponding mounting holes (3) and are fixedly connected to the bracket plate (1) by injection molding to form an integral part.

5. The injection molding process for an automotive plug inner frame according to claim 2, characterized in that, The mold includes an upper mold (11) and a lower mold (12) corresponding to the upper mold (11). The upper mold (11) and the lower mold (12) are closed to form a mold cavity (13). The upper mold (11) is provided with a pouring gate (14), which is connected to the mold cavity (13). The lower mold (12) is provided with a number of limiting grooves (15) that match one end of a number of copper tube pins (2). The opening end of the limiting groove (15) is located inside the mold cavity (13). The bottom end of some of the limiting grooves (15) is provided with an injection molding head (6) that matches the guide head (6). The upper mold (11) is provided with a number of slots (17) that match the other ends of a number of copper pipe feet (2). The slots (17) are provided with mold pillars (18) that match the wiring part (7). The mold pillars (18) are fixedly connected to the center of the slots (17). The slots (17) are located in the mold cavity (13). The mold cavity (13) is located at the top of the lower mold (12). The bottom of the lower mold (12) is provided with an ejector device (19). The ejector device (19) is slidably connected to the lower mold (12) and corresponds to the mold cavity (13).

6. The injection molding process for an automotive plug inner frame according to claim 5, characterized in that, The pouring gate (14) is located at the top of the upper mold (11), the mold cavity (13) is located at the bottom of the upper mold (11), the upper mold (11) is provided with a first sprue (20), the top of the lower mold (12) is provided with a second sprue (21), and the pouring gate (14) is connected to the mold cavity (13) in sequence through the first sprue (20) and the second sprue (21).

7. The injection molding process for an automotive plug inner frame according to claim 6, characterized in that, The number of mold cavities (13) is two, and the two mold cavities (13) are distributed on the left and right with the second sprue (21) as the center. The pouring gate (14) is connected to the center of the second sprue (21) through the first sprue (20). The two ends of the second sprue (21) are connected to the two mold cavities (13) respectively.

8. The injection molding process for an automotive plug inner frame according to claim 5, 6, or 7, characterized in that, The lower mold (12) has mold feet (22) on both the left and right sides of its bottom. The mold feet (22) are fixedly connected to the lower mold (12). The ejector device (19) is located between the two mold feet (22). The ejector device (19) includes a base plate (23), a top plate (24) and several ejector rods (25). The left and right ends of the base plate (23) are fixedly connected to the two mold feet (22) respectively. The top plate (24) is located on the base plate (23) and is slidably connected to the mold feet (22). The ejector rods (25) are fixedly connected to the top plate (24) and are perpendicular to the top plate (24). The mold cavity (13) has several through holes that match the ejector rods (25) one by one. The through holes are located on the side of the limiting groove (15).

9. The injection molding process for an automotive plug inner frame according to claim 5, 6, or 7, characterized in that, The upper mold (11) has several evenly distributed guide posts (26) on its edge. One end of the guide post (26) is fixedly connected to the upper mold (11). The lower mold (12) has several guide grooves (27) that correspond one-to-one with the guide posts (26). The guide grooves (27) are equipped with guide sleeves that match the guide posts (26). The upper mold (11) is slidably connected up and down through the guide posts (26) and guide sleeves that match one-to-one.

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