Mold drawing structure of injection mold for manufacturing automobile wiring terminal

Abstract

The utility model discloses a mold drawing structure of an injection mold for manufacturing an automobile wiring terminal, and relates to the field of injection molds, the mold drawing structure comprises a movable mold and a fixed mold which are mutually opened and closed, and one side of the surface of the movable mold is symmetrically and fixedly connected with a cavity upper mold; one side of the surface of the fixed mold is symmetrically and fixedly connected with a cavity lower mold which can be separated from and closed with the cavity upper mold and form a cavity when closed, and first mold drawing assemblies used for sealing the side edge of the cavity upper mold are symmetrically arranged outside the fixed mold; a second die drawing assembly used for sealing the space between the two cavity upper dies and reducing flash is arranged outside the movable die and the fixed die, and a core drawing assembly used for being matched with the first die drawing assembly and the second die drawing assembly to form a closed cavity is arranged outside the fixed die. Through triple cooperation of the first mold pulling assembly, the second mold pulling assembly and the core pulling assembly, no dead corner exists in the cavity, injection molding flashes are remarkably reduced, and the surface quality of a product is improved.

Description

Technical Field

[0001] This application relates to the field of injection molds, and more particularly to a molding structure for an injection mold used in the manufacture of automotive terminal blocks. Background Technology

[0002] In the automotive connector manufacturing industry, terminals are key electrical contact components, and their requirements for dimensional accuracy, structural integrity (especially the precision of the inner hole and conductive sheet area) and appearance quality (no burrs) are extremely stringent.

[0003] When molding precision plastic parts with complex internal cavities, traditional injection molds often struggle to achieve a zero-gap, absolute seal under high-pressure melt injection in the parting zone where multiple sliders and moving cores intersect. Even minor seal failures can lead to difficult-to-repair burrs, affecting not only the appearance of the terminals but also potentially interfering with critical electrical connections, resulting in higher product scrap rates and increased post-processing costs. Utility Model Content

[0004] To improve the problem of flash caused by sealing failure, this application provides a molding structure for an injection mold used in the manufacture of automotive terminal blocks.

[0005] The molding structure of an injection mold for manufacturing automotive terminal blocks provided in this application adopts the following technical solution:

[0006] A molding structure for an injection mold used in manufacturing automotive terminal blocks includes a movable mold and a fixed mold that open and close to each other. A cavity upper mold is symmetrically fixedly connected to one side of the surface of the movable mold. A cavity lower mold that can be separated from and closed to the cavity upper mold and forms a cavity when closed is symmetrically fixedly connected to one side of the surface of the fixed mold. A first molding assembly for sealing the side of the cavity upper mold is symmetrically arranged outside the fixed mold. A second molding assembly for sealing between the two cavity upper molds and reducing flash is arranged outside the movable mold and the fixed mold. A core-pulling assembly for cooperating with the first molding assembly and the second molding assembly to form a closed cavity is arranged outside the fixed mold.

[0007] By adopting the above technical solution, the triple synergy of the first mold-pulling component, the second mold-pulling component, and the core-pulling component achieves a cavity seal without dead angles, significantly reduces injection flash, and improves product surface quality.

[0008] Preferably, the first mold-drawing assembly includes a side pressure block fixedly connected to one side of the upper mold surface of the cavity, an inclined positioning rod fixedly connected to one side of the surface of the side pressure block, a sealing block adapted to the shape of the side pressure block slidably connected to the surface of the lower mold of the cavity, and a first inclined groove adapted to the shape of the positioning rod is formed on one side of the surface of the sealing block.

[0009] By adopting the above technical solution, the inclined design of the positioning rod transforms the vertical mold closing force into a horizontal sealing force.

[0010] Preferably, the second mold-pulling assembly includes a central pressure block fixedly connected to one side of the upper mold surface of the cavity, and two inclined positioning rods are symmetrically fixedly connected to one side of the surface of the central pressure block. Two sealing blocks are symmetrically slidably connected to the sides of the two lower molds of the cavity that are close to each other, and a second inclined groove is provided on one side of the surface of each of the two sealing blocks.

[0011] By adopting the above technical solution, the second sealing block slides in the second groove, and the auxiliary block restricts the lateral displacement to prevent the sealing block from detaching due to pressure imbalance during the injection molding process.

[0012] Preferably, the core-pulling assembly includes two guide holes respectively opened inside the two lower mold cavities, and a core of a suitable size is slidably connected inside the guide holes. A mold-closing rod that is slidably connected through the core is fixedly connected to one side of the surface of each of the two lower mold cavities.

[0013] By adopting the above technical solution, the core is positioned by two guide holes and a mold clamping rod, eliminating radial wobble from a single guide hole and ensuring coaxiality between the core and the cavity.

[0014] Preferably, the surface of the fixed mold is provided with a first sliding groove, and auxiliary blocks are symmetrically fixedly connected to the inner wall of the first sliding groove. The sealing block is slidably connected between the inside of the first sliding groove and the two auxiliary blocks.

[0015] By adopting the above technical solution, the auxiliary block forms a double-support structure, which improves its ability to resist eccentric loading of melt.

[0016] Preferably, the surface of the fixed mold is provided with a second sliding groove connecting the two lower cavities. The inner wall of the second sliding groove is symmetrically fixed with auxiliary blocks two, and the two sealing blocks two are slidably connected between the inside of the second sliding groove and the two auxiliary blocks two.

[0017] By adopting the above technical solution, the auxiliary block 2 and the sealing block 2 form a force couple, which neutralizes the lateral force generated by the injection.

[0018] Preferably, a movable block is fixedly connected to one side of the surface of the two cores and slidably connected to the inner wall of the fixed mold. A pressing block is slidably connected to the surface of the movable block and fixedly connected to the surface of the moving mold. A cylinder is fixedly connected to one side of the surface of the fixed mold, and the movable end of the cylinder is fixedly connected to the movable block.

[0019] By adopting the above technical solution, the cylinder starts with a delay after the mold is opened, and the moving block and core are driven to exit only after the upper mold is fully lifted, thus preventing the product from deforming due to premature core removal.

[0020] Preferably, a positioning post is fixedly connected to one side of the surface of the lower mold cavity, and the mold closing rod is located inside the positioning post.

[0021] By adopting the above technical solution, the positioning pin provides coarse positioning in the initial stage of mold closing, and the mold closing rod achieves fine positioning when the core is inserted, thus providing double protection to avoid collision between the core and the cavity.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] During the mold closing process, the side pressure block and the central pressure block drive the mechanical compression of the sealing block 1 and sealing block 2 through positioning rod 1 and positioning rod 2 (first sealing), and together with the precise insertion of the core driven by the cylinder (second sealing), they jointly construct a highly reliable sealed space. The cooperation of positioning rod 1 and positioning rod 2 with the first and second inclined grooves efficiently converts the vertical mold closing force into lateral / horizontal sealing force, which acts directly on the parting surface or the sliding block mating surface. This mechanical force is more stable and stronger than simply relying on the mold closing force or spring force, and can effectively resist injection pressure and significantly reduce flash (burrs). After positioning rod 1 and positioning rod 2 are inserted into the first and second inclined grooves and bear the mold closing force, they form a kind of "wedge" or "mold locking" effect, which greatly enhances the rigidity and stability of the sliding block or moving parts in this area. During high-pressure injection and holding pressure, it can effectively resist the pressure of the plastic melt and prevent the moving parts (sealing block 1 and second inclined groove and their associated parts) from undergoing slight backward movement or elastic deformation, thereby ensuring the product's dimensional accuracy and wall thickness uniformity. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application;

[0025] Figure 2 This is an anatomical diagram of the moving mold and the fixed mold of this application;

[0026] Figure 3 This is a schematic diagram of the core-pulling component structure in this application;

[0027] Figure 4 This is an exploded view of the first mold-drawing component structure of this application;

[0028] Figure 5 This is an exploded view of the second mold-drawing component mechanism of this application.

[0029] Reference numerals: 1. Moving mold; 2. Fixed mold;

[0030] 3. First mold-drawing assembly; 31. Side pressure block; 32. Positioning rod 1; 33. Sealing block 1; 34. First inclined groove; 35. First sliding groove; 36. Auxiliary block 1;

[0031] 4. Second mold-drawing assembly; 41. Auxiliary block two; 42. Sealing block two; 43. Second inclined groove; 44. Central pressure block; 45. Positioning rod two; 46. Second sliding groove; 5. Lower mold of cavity; 6. Upper mold of cavity;

[0032] 7. Core-pulling assembly; 71. Positioning pin; 72. Mold closing rod; 73. Core; 74. Moving block; 75. Pressing block; 76. Cylinder; 77. Guide hole. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0034] This application discloses a molding structure for an injection mold used in the manufacture of automotive terminal blocks.

[0035] Reference Figures 1-3 A molding structure for an injection mold used in manufacturing automotive terminal blocks includes a movable mold 1 and a fixed mold 2 that can open and close. The inner wall of the movable mold 1 is fixed to the upper surfaces of two upper cavity molds 6, which are symmetrically arranged on the lower surface of the movable mold 1. The inner wall of the fixed mold 2 is fixed to the lower surfaces of two lower cavity molds 5, which are symmetrically arranged on the upper surface of the fixed mold 2. The lower cavity molds 5 and the upper cavity molds 6 can be separated and closed. When closed, the lower cavity molds 5 and the upper cavity molds 6 form a cavity for injection molding. The fixed mold 2 has two first mold-pulling assemblies 3 on its exterior. The two first mold-pulling assemblies 3 are symmetrically arranged on the upper surface of the fixed mold 2. The first mold-pulling assemblies 3 are used to seal the sides of the upper mold 6 of the cavity. The moving mold 1 and the fixed mold 2 have a second mold-pulling assembly 4 on their exterior. The second mold-pulling assembly 4 is used to seal the sides between the two upper mold 6 of the cavity and reduce flash. The fixed mold 2 has a core-pulling assembly 7 on its exterior. The core-pulling assembly 7 is used to cooperate with the first mold-pulling assembly 3 and the second mold-pulling assembly 4 to form a sealed cavity.

[0036] First, the cylinder 76 precisely pushes the core 73 into the preset position. The injection molding machine then moves the moving mold 1 towards the fixed mold 2 until it is completely closed. The core 73 fits tightly with the cavity to form a cavity in the shape of a complete terminal block (the outer wall is determined by the cavity, and the inner hole is determined by the core 73). The cavity is the container for subsequent plastic injection.

[0037] Reference Figure 2 , Figure 4The first mold-drawing assembly 3 includes a side pressure block 31 fixedly connected to one side of the surface of the upper mold 6. The top of the side pressure block 31 near the side of the upper mold 6 is fixed to the upper surface of the positioning rod 32. The positioning rod 32 is inclined and used to move the sealing block 33. The outer side of the upper surface of the lower mold 5 is slidably connected to the outer wall of the sealing block 33. Both the surface of the side pressure block 31 and the sealing block 33 are provided with inclined surfaces, and the shapes of the inclined surfaces are adapted to each other. The upper surface of the sealing block 33 is provided with a first inclined groove 34, which is inclined and connected to the positioning rod 32. 32 are parallel, the diameter of the first inclined groove 34 is adapted to the diameter of the positioning rod 32, the side of the fixed mold 2 is provided with a first sliding groove 35, the inner wall of the first sliding groove 35 is fixed with two auxiliary blocks 36, the two auxiliary blocks 36 are symmetrically arranged on the inner wall of the first sliding groove 35, and there is a gap between the bottom of the first sliding groove 35 and the bottom surface of the auxiliary block 36. The side of the sealing block 33 is convex, and the bottom end of the sealing block 33 slides between the bottom of the auxiliary block 36 and the inner wall of the first sliding groove 35 to prevent the sealing block 33 from leaving the interior of the first sliding groove 35.

[0038] When the moving mold 1 moves toward the fixed mold 2, it drives the upper mold 6 of the cavity to move toward the lower mold 5 of the cavity. When the upper mold 6 of the cavity moves, it drives the side pressure block 31 and the positioning rod 32 to move. In the initial state, the first inclined groove 34 is located below the inclined bottom end of the positioning rod 32. In this way, the positioning rod 32 is inserted into the interior of the first inclined groove 34 during the downward movement. Through the inclined surface of the side pressure block 31 and the inclination of the positioning rod 32 and the first inclined groove 34, the two sealing blocks 33 move toward the lower mold 5 of the cavity and fit against the side of the lower mold 5 of the cavity. The sealing blocks 33 slide on the surface of the first sliding groove 35 and the auxiliary block 36.

[0039] Reference Figure 2 , Figure 4 , Figure 5The second mold-drawing assembly 4 includes a central pressure block 44 fixedly connected to one side of the surface of the upper mold 6 of the cavity. The two sides of the central pressure block 44 are fixed to the sides of the two upper mold 6 of the cavity that are close to each other. The bottom center of the central pressure block 44 is trapezoidal in shape. The lower surfaces of both ends of the central pressure block 44 are fixed to the upper surfaces of two positioning rods 45, respectively. Both positioning rods 45 are inclined and symmetrically arranged. The sides of the two lower mold 5 of the cavity that are close to each other are slidably connected to two sealing blocks 42, respectively. The two sealing blocks 42 are symmetrically arranged. A second inclined groove 43 is provided on the upper surface of each sealing block 42. Both second inclined grooves 43 are inclined and parallel to the two positioning rods 45, respectively. The diameter of the second inclined groove 43 is matched with the diameter of the second positioning rod 45. The fixed mold 2 is located on the upper surface between the two lower molds 5 of the cavity and has a second sliding groove 46. The second sliding groove 46 connects the two positioning rods 45. The inner wall of the second sliding groove 46 is fixed to the surface of the two auxiliary blocks 41 and the two auxiliary blocks 41 are symmetrically arranged. There is a gap between the bottom of the two auxiliary blocks 41 and the bottom of the second sliding groove 46. The two sealing blocks 42 are symmetrically convex. The bottom ends of the two sealing blocks 42 slide between the bottom of the auxiliary blocks 41 and the bottom of the second sliding groove 46. The outer wall of the sealing block 42 fits the inner wall of the second sliding groove 46 without gap, so as to prevent the sealing block 42 from shifting when sliding and causing gaps in the cavity.

[0040] When the moving mold 1 moves towards the fixed mold 2, it drives the upper mold 6 of the cavity to move towards the lower mold 5 of the cavity. When the upper mold 6 moves, it drives the middle pressure block 44 and the positioning rod 45 to move. In the initial state, the two second inclined grooves 43 are located below the inclined bottom ends of the two positioning rods 45. In this way, the positioning rods 45 can be accurately inserted into the interior of the second inclined grooves 43 during the downward movement. The two sealing blocks 42 are symmetrically inclined on the side that is close to each other, and are adapted to the trapezoidal size of the bottom end of the middle pressure block 44. The inclination of the trapezoidal inclined surface at the bottom end of the middle pressure block 44 and the sealing blocks 42 and the second inclined grooves 43 makes the two blocks The second sealing block 42 moves toward the two lower mold 5s and fits against the sides of the lower mold 5s. The two sealing blocks 42 and the two sealing blocks 33 seal the two sides of the lower mold 5s respectively. The second sealing block 42 slides on the surface of the auxiliary block 41 and the second slide groove 46. The key lateral sealing force is generated by the mechanical conversion of the positioning rod 32, the positioning rod 45, the first inclined groove 34, and the second inclined groove 43, rather than relying entirely on the tonnage of the injection molding machine to press all the parting surfaces. This allows for the design to achieve extremely high sealing pressure in local areas without excessively increasing the overall machine tonnage.

[0041] Reference Figure 3 , Figure 5The core-pulling assembly 7 includes two guide holes 77 respectively opened inside the two cavity lower molds 5. The inner wall of the guide hole 77 slides with the outer wall of the core 73, and the size of the guide hole 77 and the core 73 are matched without gaps to avoid flash in the cavity. The middle part of the upper surface of the two cavity lower molds 5 is matched and fixed with the surface of the mold clamping rod 72. The inner wall of the mold clamping rod 72 near the cavity lower mold 5 is slidably connected with the surface of the core 73. The inner wall of the mold clamping rod 72 is matched with the size of the outer surface of the core 73. The ends of the two cores 73 away from the mold clamping rod 72 are connected to the surface of the moving block 74. The surface is fixed, the movable block 74 slides on the inner wall of the fixed mold 2, the outer surface of the movable block 74 is provided with an inclined surface, the inclined surface of the movable block 74 is in contact with the inclined surface of the lower pressure block 75 and is arranged in parallel, the upper surface of the lower pressure block 75 is fixed with the lower surface of the movable mold 1, the outer surface of the fixed mold 2 is fixed with the fixed end of the cylinder 76, the movable end of the cylinder 76 is fixed with the end of the movable block 74 away from the core 73, the upper surfaces of the two cavity lower molds 5 are fixed with the lower surface of the positioning post 71, the mold closing rod 72 is located inside the positioning post 71, and the mold closing rod 72 is used to position the positioning post 71.

[0042] In use, the cylinder 76 drives the moving block 74 to move towards the lower mold 5 of the cavity. The moving block 74 drives the two cores 73 to slide inside the guide hole 77. The cores 73 are inserted into the mold clamping rod 72, making the cavity a sealed cavity. Then, when the moving mold 1 moves downward, it drives the lower pressure block 75 to move above the moving block 74. The lower pressure block 75 limits the moving block 74. When the mold is closed, the moving mold 1 presses down, which forces the moving block 74 to be locked, fixing the core 73 and the lower mold 5 of the cavity into a rigid whole. This can significantly enhance the bending resistance of the core 73, resist the high pressure impact of the molten plastic during injection, prevent the core 73 from shifting or breaking, and ensure the dimensional stability of the product. The cylinder 76 provides controllable, stable, and repeatable linear motion, which can ensure that the positional accuracy of the core 73 when it is inserted into the mold clamping rod 72 is extremely high each time.

[0043] The cylinder 76 is existing technology, and its structural principle will not be elaborated here. The cylinder 76 adopts the MISUMI series hydraulic cylinder, and the system adopts centralized control by PLC. When the mold closing command is triggered, the PLC first drives the cylinder 76 (through a proportional valve) to insert the core 73 into the mold closing rod 72. The position signal is detected by the inductive sensor at the root of the core 73. Then, the moving mold 1 is started to move down, so that the positioning rod 1 32 and the positioning rod 2 45 are inserted into the first inclined groove 34 and the second inclined groove 43. The magnetic reed switch at the end of the positioning rod 1 32 and the positioning rod 2 45 confirms that the seal is in place. The PLC sends an injection enable signal to the injection molding machine. After the mold is opened, the PLC controls the core 73 to retract. The safety interlock is realized through triple protection: the positioning rod 1 32, the positioning rod 2 45 and the core 73 position signal are connected in series to the emergency stop circuit; the pressure / position signal is valid for 50ms before injection is allowed; the mold protection program is automatically triggered after a 200ms core pulling timeout.

[0044] To prevent malfunctions, the PLC program has an automatic alarm and re-execution mechanism. If the core-pulling signal is not triggered within 200ms, the system will pause injection and prompt manual inspection to avoid mold damage.

[0045] The implementation principle of the molding structure of an injection mold for manufacturing automotive terminal blocks according to an embodiment of this application is as follows: In the initial state, the first inclined groove 34 is located below the inclined bottom end of the positioning rod 32, and the two second inclined grooves 43 are located below the inclined bottom ends of the two positioning rods 45.

[0046] First, the cylinder 76 extends, causing the moving block 74 to move towards the lower mold 5 of the cavity. The moving block 74 drives the two cores 73 to insert into the mold clamping rod 72 for sealing. Then, the injection molding machine pushes the moving mold 1 towards the fixed mold 2. When the moving mold 1 moves downward, it drives the pressure block 75 to move above the moving block 74. The pressure block 75 limits the moving block 74. When the mold closes, the moving mold 1 presses down, forcibly locking the moving block 74 and fixing the core 73 and the lower mold 5 of the cavity into a rigid whole. When the moving mold 1 moves, it drives the upper mold 6 of the cavity to move. The upper mold 6 of the cavity drives the positioning rod 1 32 to insert into the first inclined groove 34 and the two positioning rods 2 45 to insert into the second inclined groove 43 respectively. The inclined arrangement of the positioning rod 1 32, the positioning rod 2 45 and the first inclined groove 34 and the second inclined groove 43 causes the sealing block 1 33 and the sealing block 2 42 to move and seal both sides of the lower mold 5 of the cavity. The sealing block 33 and sealing block 42 together construct a highly reliable sealed space. The cooperation of positioning rod 32, positioning rod 45 with the first inclined groove 34 and the second inclined groove 43 efficiently converts the vertical clamping force into a lateral / horizontal sealing force, which acts directly on the parting surface or the sliding block mating surface. This effectively resists injection pressure and significantly reduces flash (burrs). After positioning rod 32 and positioning rod 45 are inserted into the first inclined groove 34 and the second inclined groove 43 and bear the clamping force, they form a "wedge" or "lock" effect, which greatly enhances the rigidity and stability of the sliding block or moving parts in this area. The first mold pulling assembly 3, the second mold pulling assembly 4 and the core pulling assembly 7 work together. Through mechanical wedge clamping and pneumatic timed core pulling, while maintaining a high sealing pressure on the parting surface, synchronous core pulling inside the cavity is achieved. This has the synergistic technical effect of improving injection molding accuracy and preventing flash.

[0047] Subsequently, the injection molding machine injects the heated and molten plastic in the barrel into the sealed cavity at high pressure and high speed through the nozzle and the main runner, branch runner, and gate of the mold. The molten plastic quickly fills the entire cavity, replicating the shape of the cavity and the core 73. After the injection is completed and cooled, the injection molding machine moves the moving mold 1 away from the fixed mold 2. When the fixed mold 2 moves, the positioning rod 1 32 and positioning rod 2 45 are moved away from the interior of the first inclined groove 34 and the second inclined groove 43 through the upper mold 6 of the cavity. During the separation process, the positioning rod 1 32 and positioning rod 2 45 drive the sealing block 1 33 and sealing block 2 42 to move away from the lower mold 5 of the cavity. Then the cylinder 76 is activated, driving the core 73 to exit from the inner hole of the terminal.

[0048] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A molding structure for an injection mold used in manufacturing automotive terminal blocks, characterized in that: The system includes a movable mold (1) and a fixed mold (2) that can open and close to each other. A cavity upper mold (6) is symmetrically fixedly connected to one side of the surface of the movable mold (1). A cavity lower mold (5) that can be separated from and closed to the cavity upper mold (6) and forms a cavity when closed is symmetrically fixedly connected to one side of the surface of the fixed mold (2). A first mold-pulling assembly (3) for sealing the side of the cavity upper mold (6) is symmetrically arranged on the outside of the fixed mold (2). A second mold-pulling assembly (4) for sealing between the two cavity upper molds (6) and reducing flash is arranged on the outside of the movable mold (1) and the fixed mold (2). A core-pulling assembly (7) for cooperating with the first mold-pulling assembly (3) and the second mold-pulling assembly (4) to form a closed cavity is arranged on the outside of the fixed mold (2).

2. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 1, characterized in that: The first mold-drawing assembly (3) includes a side pressure block (31) fixedly connected to one side of the surface of the upper mold (6) of the cavity. An inclined positioning rod (32) is fixedly connected to one side of the surface of the side pressure block (31). A sealing block (33) adapted to the shape of the side pressure block (31) is slidably connected to the surface of the lower mold (5) of the cavity. A first inclined groove (34) adapted to the shape of the positioning rod (32) is opened on one side of the surface of the sealing block (33).

3. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 1, characterized in that: The second mold-drawing assembly (4) includes a central pressure block (44) fixedly connected to one side of the surface of the upper mold (6) of the cavity. A second positioning rod (45) in an inclined shape is symmetrically fixedly connected to one side of the surface of the central pressure block (44). A second sealing block (42) is symmetrically slidably connected to one side of the two lower molds (5) of the cavity that are close to each other. A second inclined groove (43) is provided on one side of the surface of each of the two second sealing blocks (42).

4. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 1, characterized in that: The core-pulling assembly (7) includes two guide holes (77) respectively opened inside the two cavity lower molds (5). The guide holes (77) are slidably connected to a core (73) of a matching size. Each of the two cavity lower molds (5) is fixedly connected to a mold-closing rod (72) that is slidably connected through the core (73) on one side of its surface.

5. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 2, characterized in that: The surface of the fixed mold (2) is provided with a first groove (35), and auxiliary blocks (36) are symmetrically fixedly connected to the inner wall of the first groove (35). The sealing block (33) is slidably connected between the inside of the first groove (35) and the two auxiliary blocks (36).

6. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 3, characterized in that: The surface of the fixed mold (2) is provided with a second slide groove (46) connecting the two cavity lower molds (5). The inner wall of the second slide groove (46) is symmetrically fixed with auxiliary blocks (41). The two sealing blocks (42) are slidably connected between the inside of the second slide groove (46) and the two auxiliary blocks (41).

7. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 4, characterized in that: One side of the surface of the two cores (73) is fixedly connected to a movable block (74) that is slidably connected to the inner wall of the fixed mold (2). The surface of the movable block (74) is slidably connected to a pressing block (75) that is fixedly connected to the surface of the moving mold (1). One side of the surface of the fixed mold (2) is fixedly connected to a cylinder (76), and the movable end of the cylinder (76) is fixedly connected to the movable block (74).

8. The molding structure of an injection mold for manufacturing automotive terminal blocks according to claim 4, characterized in that: A positioning post (71) is fixedly connected to one side of the surface of the lower mold (5) of the cavity, and the mold closing rod (72) is located inside the positioning post (71).

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