A production process of a fixed mold core-pulling insert encapsulation product based on a single-shot injection molding machine

Abstract

This invention discloses a production process for a fixed-mold core-removing insert-coated product based on a single-shot injection molding machine. The single-shot injection molding machine uses a first cylinder to drive a first valve needle to open the first injection port, injecting molten transparent plastic material into the first injection cavity to form a cup-shaped first injection part. After the first valve needle closes the first injection port, the mold opens, and a graduated insert is placed in an inclined groove. A hydraulic cylinder drives a movable core in the fixed mold to retract, and after mold closing, a two-shot molding cavity is formed. A second cylinder drives a second valve needle to open a second injection port, and the injection molding machine injects molten transparent plastic material into the two-shot molding cavity through the second injection port to form a second injection part. The second injection part is located in the injection groove and the inclined groove, and cooperates with the first injection part to encapsulate the insert, forming a coated product. This production process eliminates the need for a double-shot injection molding machine turntable mechanism and a double-shot mold, reducing equipment and mold investment costs, reducing floor space, eliminating the turntable rotation action, and shortening the molding cycle.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a production process for a fixed mold core-removing insert overmolded product based on a single-shot injection molding machine. Background Technology

[0002] A measuring cup is a commonly used instrument for measuring the volume of liquids. The corresponding volume of liquid can be measured by reading the value corresponding to the scale on the side or bevel of the measuring cup wall.

[0003] Currently, there are generally three methods for producing graduated measuring cups: The first is to print the volume markings on the outer wall of the measuring cup after injection molding. However, over time, the markings on the outer wall can wear down, affecting the reading of the liquid volume and making the cup difficult to use. The second method involves directly injection molding the markings onto the outer wall of the measuring cup, with transparent lettering. This can also lead to unclear markings during use, affecting user experience. The third method uses a double-injection molding machine, where the cup is first molded into a single mold. The process involves completing one injection molding to obtain a semi-finished product. Then, a robotic arm places a PET film with printed markings onto the semi-finished product, and a second set of molds is used for a second injection encapsulation. This method requires two sets of molds, which not only increases mold costs but also results in a large footprint and high equipment costs for the dual-injection molding machine. The semi-finished product is rotated 180 degrees to the fixed position of the second set of molds for the second injection encapsulation, thus increasing the injection molding cycle. Furthermore, the insertion position may shift during the 180-degree rotation of the dual-injection mold turntable, leading to defective products in the final product. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a production process for fixed-mold core-removing insert overmolding products based on a single-shot injection molding machine. This addresses the problems of directly printing volume markings on the outer wall of the injection-molded measuring cup, which easily leads to wear and tear on the markings over time, affecting user experience; directly injection molding markings on the outer wall of the measuring cup with transparent lettering, resulting in unclear markings during use, also affecting user experience; and the high cost of molds using a double-shot injection molding machine, which also requires a large footprint and high equipment cost. Furthermore, rotating the semi-finished product 180 degrees from the first injection to the fixed-mold position of the second mold for the second overmolding process increases the injection molding cycle and can easily lead to insert position misalignment during the 180-degree rotation of the double-shot injection mold turntable, resulting in defective final products.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a production process for a fixed mold core-removing insert overmolding product based on a single-shot injection molding machine, comprising the following steps: Step 1: Insert fabrication: Colored inserts are injection molded using an injection molding machine, and heat-resistant and eye-catching colored scales are printed on the inserts; Step 2: One-shot injection molding: When the single-shot injection molding machine closes the mold, the first cylinder drives the first valve needle to open the first injection port, and the second cylinder drives the second valve needle to close the second injection port. The single-shot injection molding machine injects molten transparent plastic material into the injection cavity of the moving mold and the fixed mold through the first injection port of the mold to form a cup-shaped first injection molded part, thus obtaining a single-shot product. The outer side wall of the first injection molded part has a connected inclined groove and injection groove. Step 3: Remove and install the insert: The first cylinder drives the first valve needle to close the first injection port, the single injection molding machine opens the mold, and controls the five-axis robotic arm to place the pre-grabbed insert into the inclined groove. At this time, there is a distance between the top surface of the insert and the opening of the inclined groove. Step 4: Two-shot injection molding: The hydraulic cylinder drives the movable core in the fixed mold to retract, the retraction distance being the depth of the inclined groove. The single-shot injection molding machine closes the mold, so that the first injection part on the moving mold and the fixed mold are closed to form a two-shot molding cavity. The second cylinder drives the second valve needle to open the second injection port facing the injection groove. The single-shot injection molding machine injects molten transparent plastic material into the two-shot molding cavity through the second injection port of the mold to form the second injection part. The second injection part is located in the injection groove and the inclined groove, and cooperates with the first injection part to wrap the insert in the inclined groove to form a rubber-coated product. After holding the pressure for a certain period of time, the second cylinder drives the second valve needle to close the second injection port, and enters the cooling stage of the rubber-coated product. Step 5: Picking up the coated product: After the product cools down, the single-shot injection molding machine opens the mold, the hydraulic cylinder drives the movable core in the fixed mold to reset, and at the same time the ejector plate ejects the overmolded product, and the five-axis robotic arm takes out the overmolded product. Then repeat steps two, three, four, and five.

[0006] Preferably, the mold also includes a mold core removal mechanism, which includes a hydraulic cylinder fixed to the side wall of the fixed mold. A slide rod is fixedly installed at the output end of the hydraulic cylinder. A first slide groove is provided on both sides of the slide rod. A movable core is movably provided on the fixed mold. A second slide groove adapted to the movable core is opened on the side of the slide rod. Guide protrusions and inclined rods adapted to the first slide groove are provided on both sides of the inner wall of the second slide groove.

[0007] Preferably, the second injection molded part includes an integral first closure and a second closure, wherein the inclined groove, the insert and the first closure are all U-shaped.

[0008] Preferably, there are two second injection ports. Both ends of the first sealing member are provided with second sealing members that are adapted to the size of the injection groove. Each second injection port is directly opposite an injection groove and is connected to the second sealing member during injection.

[0009] Preferably, the movable core has a first hot nozzle through hole and two second hot nozzle through holes along the movement direction of the movable core.

[0010] Compared with the prior art, the beneficial effects that this invention can achieve are: This invention relates to a single-shot injection molding machine. A first cylinder in the mold drives a first valve needle to open the first injection port, injecting molten transparent plastic material into the injection cavities of the moving and fixed molds to form a cup-shaped first injection molded part. The first cylinder then drives the first valve needle to close the first injection port. The mold is then opened, and a graduated insert is placed in an inclined groove. A hydraulic cylinder drives the movable core in the fixed mold to retract, with the retraction distance equal to the depth of the inclined groove. The mold is then closed, allowing the moving and fixed molds to enclose a two-shot molding cavity. A second cylinder drives a second valve needle to open the second injection port, and the single-shot injection molding machine injects molten transparent plastic material into the two-shot molding cavity through the second injection port to form a second injection molded part. The second injection molded part is located within the injection groove and the inclined groove, and it works in conjunction with the first injection molded part to enclose the insert in the inclined groove, forming an overmolded product. Compared to screen-printing volume markings on the outer wall and bevel of a transparent measuring cup during a single injection molding process, this manufacturing process avoids the problem of the markings on the outer wall and bevel being worn down over time during actual use, thus affecting the accurate reading of the liquid volume inside the measuring cup. It also avoids the problem of unclear markings when directly injection molding the markings on the outer wall and bevel of the measuring cup, which can lead to illegible markings during actual use and affect user experience. Furthermore, this manufacturing process eliminates the need for a double-shot injection molding machine, double-shot injection molds, and a turntable structure, reducing equipment and mold investment costs, minimizing equipment footprint, eliminating the turntable movement of a double-shot injection molding machine, shortening the injection molding cycle, and avoiding the problem of insert misalignment that can occur during the 180° rotation of the double-shot injection mold turntable, leading to defective products. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the single-shot injection molding machine and the five-axis robotic arm of the present invention; Figure 2 This is a schematic diagram showing the cross-sectional position of the mold structure of the present invention; Figure 3 To reset the movable core of this invention, during injection molding, Figure 2 Schematic diagram of the cross-sectional structure of the middle mold JJ; Figure 4 For the present invention Figure 3 A magnified view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the state structure of the first injection molded part of the present invention when the first valve needle closes the first injection port after injection molding; Figure 6This is a schematic diagram of the state structure of the single-shot injection molding machine of the present invention when the first valve needle opens the first injection port during mold closing; Figure 7 For the purpose of resetting the movable core during injection molding according to the present invention, Figure 2 Schematic diagram of the LL cross-sectional structure of the middle mold; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point C in the middle; Figure 9 For the present invention Figure 7 A magnified schematic diagram of the structure at point D in the middle; Figure 10 For the removal of the movable core in this invention, during two-shot injection molding, Figure 2 Schematic diagram of the LL cross-sectional structure of the middle mold; Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point E in the middle; Figure 12 For the present invention Figure 10 A magnified schematic diagram of the structure at point F in the middle; Figure 13 For the present invention, during injection molding, Figure 2 Cross-sectional view of the middle mold structure (MM), and cross-sectional view of the position of the second valve needle; Figure 14 For the present invention Figure 13 A magnified schematic diagram of the structure at point G in the middle; Figure 15 For the two-shot injection molding of this invention, Figure 2 Cross-sectional view of the middle mold structure (MM section), and cross-sectional view of the position of the second valve needle; Figure 16 For the present invention Figure 15 A magnified schematic diagram of the structure at point H in the middle; Figure 17 This is a schematic diagram of the mold core removal mechanism, movable core, first hot nozzle through hole, and second hot nozzle through hole structure of the present invention; Figure 18 This is a schematic diagram of the exploded structure of the coated product of the present invention; Figure 19 For the present invention Figure 18 Enlarged view of a section of the KK cross-section; Figure 20 This is a schematic diagram of the structure of the coated product of the present invention; Figure 21 This is a schematic diagram of the first injection molded part, the inclined groove, and the injection groove of the present invention; Figure 22 This is a schematic diagram of the structure of the first injection molded part on the moving mold after injection molding according to the present invention; Figure 23This is a schematic diagram of the structure after the insert of the present invention is placed in the inclined groove on the first injection molded part; Figure 24 This is a schematic diagram of the overmolded product structure on the moving mold after two-shot injection molding according to the present invention; The components are as follows: 1. First injection molded part; 101. Inclined groove; 102. Injection groove; 2. Insert; 3. Second injection molded part; 31. First sealing part; 32. Second sealing part; 4. Mold core ejection mechanism; 41. Hydraulic cylinder; 42. Slide rod; 43. First slide groove; 5. Movable core; 51. Second slide groove; 52. Guide protrusion inclined rod; 6. Fixed mold; 7. Moving mold; 8. Five-axis robotic arm; 9. Top plate; 10. Ejection insert; 11. First hot nozzle; 12. First valve needle; 13. Second hot nozzle; 14. Second valve needle; 15. First hot nozzle through hole; 16. Second hot nozzle through hole; 17. First injection port; 18. Second injection port. Detailed Implementation

[0012] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this invention.

[0013] like Figures 1-24 As shown, this invention provides a manufacturing process for a fixed-mold core-removal insert overmolding product based on a single-shot injection molding machine, comprising the following steps: Step 1: Preparation of Insert 2: The colored insert 2 is injection molded using an injection molding machine. The insert 2 has printed heat-resistant and eye-catching colored (here set as red, but including but not limited to red) scales. The material of the insert 2 is the same plastic material as the first injection molded part 1. Step 2: One-shot injection molding: When the single-shot injection molding machine closes the mold, the first cylinder drives the first valve pin 12 to open the first injection port 17 (e.g.) Figure 3 and Figure 6 As shown), the second cylinder drives the second valve needle 14 to close the second glue injection port 18 (as shown). Figure 13 and Figure 14 (As shown), (specifically, the movement of the first valve needle 12 and the second valve needle 14 to open or close the first injection port 17 and the second injection port 18 can be controlled by a cylinder drive assembly; this is existing technology for needle valve type hot runners, and will not be elaborated here). The single-shot injection molding machine injects molten transparent plastic material through the first injection port 17 into the single-shot cavity of the moving mold 7 and the fixed mold 6 to form a cup-shaped first injection molded part 1, obtaining a single-shot product. The outer wall of the first injection molded part 1 has a connected inclined groove 101 and an injection groove 102 (as shown). Figure 3 , Figure 6 , Figure 21 and Figure 22 (as shown) Step 3: Install insert 2: The first cylinder drives the first valve needle 12 to close the first glue injection port 17 (as shown in the image). Figure 5 (As shown) (to avoid the molten plastic damaging the surface of the first injection molded part 1 during subsequent second injection molding, ensuring that the two injections can be completed in an orderly manner on the single-injection molding machine), the single-injection molding machine opens the mold, and controls the five-axis robotic arm 8 to place the pre-grabbed insert 2 into the inclined groove 101 (as shown) Figure 22 and Figure 23 As shown), at this time, there is a distance between the top surface of the insert 2 and the opening of the inclined groove 101, and this distance is the same as the thickness of the first sealing member 31 (as shown). Figure 12 (as shown) Step 4: Two-shot injection molding: The hydraulic cylinder 41 drives the movable core 5 inside the fixed mold 6 to retract, the retraction distance being the depth of the inclined groove 101. The single-shot injection molding machine closes the mold, causing the first injection molded part 1 on the moving mold 7 and the fixed mold 6 to surround and form a two-shot molding cavity. The second cylinder drives the second valve needle 14 to open the second injection port 18 directly opposite the injection groove 102 (e.g., Figure 15 and Figure 16 As shown), the single-shot injection molding machine injects molten plastic material into the two-shot molding cavity through the second injection port 18 of the mold to form the second injection molded part 3. The second injection molded part 3 is located in the injection groove 102 and the inclined groove 101, and cooperates with the first injection molded part 1 to wrap the insert 2 in the inclined groove 101 to form an overmolded product (such as...). Figure 10 , Figure 12 , Figure 15 , Figure 16 and Figure 24 As shown, where Figure 12 and Figure 16 The diagrams show the state of the first sealing member 31 and the second sealing member 32 of the second injection molded part 3 being injected into the inclined groove 101 and the injection groove 102, respectively. After holding the pressure for a certain period of time, the second cylinder drives the second valve needle 14 to close the second injection port 18, and the product enters the cooling stage of the overmolded product. Step 5: Picking up the coated product: After the product cools, the single-shot injection molding machine opens the mold, and the hydraulic cylinder 41 drives the movable core 5 inside the fixed mold 6 to reset. At the same time, the ejector plate ejection mechanism ejects the overmolded product (such as...). Figure 3 As shown, the specific push plate ejection mechanism includes an ejection insert 10, a top plate 9 located at one end of the ejection insert 10, and a drive component for driving the ejection insert 10 (the drive component is not shown in the figure). The five-axis robotic arm 8 takes out the coated product and places it on the side of the machine. Then repeat steps two, three, four, and five. The above process allows for the production of the overmolded measuring cup using a single-shot injection molding machine. This not only avoids the problem of the existing method of directly screen-printing volume markings on the outer wall and bevel of the overmolded measuring cup, preventing wear and tear on the markings over time and affecting accurate readings of the liquid volume, but also avoids the issue of unclear markings due to the transparent lettering on the outer wall and bevel, which can hinder user reading. Furthermore, this process eliminates the need for a double-shot injection molding machine, molds, and a turntable structure, reducing equipment and mold costs, minimizing equipment footprint, and shortening the injection molding cycle by eliminating the turntable (rotating mold) action of a double-shot injection molding machine. It also avoids the problem of insert misalignment during a 180° rotation of the double-shot injection mold turntable, which could lead to defective products.

[0014] like Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 10 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 21 , Figure 22 , Figure 23 and Figure 24 As shown, it also includes a mold core removal mechanism 4. The mold core removal mechanism 4 includes a hydraulic cylinder 41 fixed to the side wall of the fixed mold 6. A slide rod 42 is fixedly installed at the output end of the hydraulic cylinder 41. The slide rod 42 is provided with first slide grooves 43 on both sides. The fixed mold 6 is provided with a movable core 5. The movable core 5 has a first hot nozzle through hole 15 and two second hot nozzle through holes 16 along the movement direction of the movable core 5. A part of the first hot nozzle 11 is located in the first hot nozzle through hole 15, and a part of the second hot nozzle 13 is located in the second hot nozzle through hole 16. The positions of the first hot nozzle 11 and the second hot nozzle 13 remain unchanged, and the movable core 5 is clearance-fitted with the first hot nozzle 11 and the second hot nozzle 13 to ensure that the movable core 5 will not collide with the first hot nozzle 11 and the second hot nozzle 13 when it moves. The movable core 5 is provided with a second slide groove 51 on the side facing the slide rod 42. The inner wall of the second slide groove 51 is provided with guide protrusions 52 that are adapted to the first slide groove 43 on both sides. Driven by the hydraulic cylinder 41, the slide bar 42 moves, and with the cooperation of the first slide groove 43 and the guide protrusion 52, the movable core 5 moves closer to the moving mold 7 to reset (the movable core 5 will not collide with the first hot nozzle 11 and the second hot nozzle 13 during the movement), the mold closes, and the first cylinder drives the first valve needle 12 to open the first injection port 17 (as shown). Figure 3 and Figure 6As shown), the second cylinder drives the second valve needle 14 to close the second glue injection port 18 (as shown). Figure 13 and Figure 14 As shown), the single-shot injection molding machine injects molten transparent plastic material into the single-shot cavity through the first injection port 17 of the mold to form a cup-shaped first injection molded part 1, thus obtaining a single-shot product (such as...). Figure 21 and Figure 22 As shown), then the first cylinder drives the first valve needle 12 to close the first glue injection port 17 (as shown). Figure 5 As shown), the single-shot injection molding machine opens the mold and places the insert 2 in the inclined groove 101 (as shown). Figure 22 and Figure 23 As shown), the sliding rod 42 is driven by the hydraulic cylinder 41 to move. With the cooperation of the first sliding groove 43 and the guide protrusion 52, the movable core 5 is driven away from the moving mold 7 to retract (the movable core 5 will not collide with the first hot nozzle 11 and the second hot nozzle 13 during the movement). The retraction distance is the depth of the inclined groove 101. The single-shot injection molding machine closes the mold again, and the second cylinder drives the second valve needle 14 to open the second injection port 18 facing the injection groove 102 (as shown). Figure 15 and Figure 16 As shown), a second injection molded part 3 is injection molded in the two-shot molding cavity. The second injection molded part 3 is located in the injection groove 102 and the inclined groove 101 (as shown). Figure 23 and Figure 24 (as shown), and together with the first injection molded part 1, the insert 2 is wrapped to form an overmolded product; By setting the mold core removal mechanism 4, the straightness and positioning accuracy of the moving core 5 are ensured, so as to accurately complete the core removal and resetting actions under the working rhythm of the single-color injection molding machine.

[0015] like Figure 18 and Figure 24 As shown, the second injection molded part 3 includes an integral first closure 31 and a second closure 32, and the inclined groove 101, the insert 2 and the first closure 31 are all U-shaped; By setting an inclined groove 101, after the first injection molding, the graduated insert 2 is placed in the inclined groove 101, and the second injection molded part 3 cooperates with the first injection molded part 1 to wrap the insert 2. This ensures that when the measuring cup is placed on the table, the scale is in an inclined position, which makes it convenient for people to read the scale when pouring liquid into the measuring cup. This avoids the trouble of having to bend down and look down when reading the scale set on the vertical side wall of the measuring cup.

[0016] like Figure 13 , Figure 14 , Figure 15 , Figure 16 and Figure 24As shown, there are two second injection ports 18. By setting two second injection ports 18, the efficiency of two-shot injection molding is accelerated. Both ends of the first sealing member 31 are provided with second sealing members 32 that are adapted to the size of the injection groove 102. Each second injection port 18 is directly opposite an injection groove 102. With this setting, after the two-shot injection molding is completed, no gate marks will appear at the position corresponding to the insert 2 on the overmolded product, ensuring that the normal reading of the scale on the measuring cup will not be affected.

[0017] like Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 21 , Figure 23 and Figure 24 As shown, the injection groove 102 is located on the bottom surface of the outer wall of the cup-shaped first injection molded part 1. The bottom surface of the first injection molded part 1 and the groove surface of the injection groove 102 are parallel to the groove surface of the first injection port 17 and the groove surface of the second injection port 18. This facilitates the injection of glue into the hot runner and avoids the need for additional processing of the gate marks at the groove of the second injection port 18. At the same time, this arrangement ensures that the gate marks remaining at the first injection port 17 and the second injection port 18 are only on the bottom surface of the measuring cup-coated product, without affecting the use and appearance of the product.

[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a fixed-mold core-removal insert overmolded product based on a single-shot injection molding machine, characterized in that, Includes the following steps: Step 1: Preparation of insert (2): A colored insert (2) is injection molded using an injection molding machine, and a heat-resistant and eye-catching colored scale is printed on the insert (2); Step 2: One-shot injection molding: When the single-shot injection molding machine closes the mold, the first cylinder drives the first valve needle (12) to open the first injection port (17), and the second cylinder drives the second valve needle (14) to close the second injection port (18). The single-shot injection molding machine injects molten transparent plastic material into the injection cavity of the moving mold (7) and the fixed mold (6) through the first injection port (17) of the mold to form a cup-shaped first injection molded part (1), thus obtaining a single-shot product. The outer side wall of the first injection molded part (1) has a connected inclined groove (101) and injection groove (102). Step 3: Remove the insert (2) and install it: The first cylinder drives the first valve needle (12) to close the first injection port (17), the single injection molding machine opens the mold, and controls the five-axis robotic arm (8) to place the pre-grabbed insert (2) into the inclined groove (101). At this time, there is a distance between the top surface of the insert (2) and the groove opening of the inclined groove (101). Step 4: Two-shot injection molding: The hydraulic cylinder (41) drives the movable core (5) in the fixed mold (6) to retract, and the retraction distance is the depth of the inclined groove (101). The single injection molding machine closes the mold, so that the first injection part (1) on the moving mold (7) and the fixed mold (6) surround and form a two-shot molding cavity. The second cylinder drives the second valve needle (14) to open the second injection port (18) facing the injection groove (102). The single injection molding machine injects molten transparent plastic material into the two-shot molding cavity through the second injection port (18) of the mold to form the second injection part (3). The second injection part (3) is located in the injection groove (102) and the inclined groove (101), and cooperates with the first injection part (1) to wrap the insert (2) in the inclined groove (101) to form a rubber-coated product. After holding the pressure for a certain time, the second cylinder drives the second valve needle (14) to close the second injection port (18) and enter the cooling stage of the rubber-coated product. Step 5: Picking up the coated product: After the product cools down, the single injection molding machine opens the mold, the oil cylinder (41) drives the movable core (5) in the fixed mold (6) to reset, and at the same time the push plate ejection mechanism ejects the coated product, and the five-axis robotic arm (8) takes out the coated product; Then repeat steps two, three, four, and five.

2. The production process of the fixed mold core-removing insert overmolded product based on a single-shot injection molding machine according to claim 1, characterized in that: It also includes a mold core removal mechanism (4), which includes an oil cylinder (41) fixed to the side wall of the fixed mold (6). A slide rod (42) is fixedly installed at the output end of the oil cylinder (41). A first slide groove (43) is provided on both sides of the slide rod (42). A movable core (5) is provided on the fixed mold (6). A second slide groove (51) is provided opposite the slide rod (42) and is adapted to it. Guide protrusions (52) are provided on both sides of the inner wall of the second slide groove (51) and are adapted to the first slide groove (43).

3. The production process of the fixed mold core-removing insert overmolded product based on a single-shot injection molding machine according to claim 2, characterized in that: The second injection molded part (3) includes an integral first closure (31) and a second closure (32), wherein the inclined groove (101), the insert (2) and the first closure (31) are all U-shaped.

4. The production process of the fixed mold core-removing insert overmolded product based on a single-shot injection molding machine according to claim 3, characterized in that: There are two second injection ports (18). Both ends of the first sealing member (31) are provided with second sealing members (32) that are adapted to the size of the injection groove (102). Each second injection port (18) is directly opposite an injection groove (102) and is connected to the second sealing member (32) when injecting glue.

5. The production process of the fixed mold core-removing insert overmolded product based on a single-shot injection molding machine according to claim 4, characterized in that: The movable core (5) has a first hot nozzle through hole (15) and two second hot nozzle through holes (16) along the movement direction of the movable core (5).

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