Automobile injection mold convenient to demold

Abstract

The automobile injection mold comprises a rectangular front mold fixing plate and a rear mold fixing plate, a female mold is fixedly installed on the lower side of the front mold fixing plate, a rear mold plate is fixedly installed on the front sides of two mold feet, a rectangular material pushing plate is arranged on the front side of the rear mold plate, and cylindrical mounting grooves are formed in the four corners of the front side of the rear mold plate respectively. A spring a is mounted in the mounting groove, the front end of the spring a is fixedly connected with the pushing plate, a male die core is arranged in the middle of the front side of the rear die plate, and a forming cavity is formed among the outer side of the male die core, the pushing plate and the female die; the male die core is composed of two protruding blocks and a frustum, a sliding block is arranged on the inclined face of the frustum, a sliding groove is formed in the inner side of each protruding block, the sliding blocks are connected with the sliding grooves in a matched and sliding mode, and the rear sides of the protruding blocks are connected with the rear die plate in a sliding mode through guide rails. The injection mold can be used for injection molding of a part with an inverted buckle structure, the male mold core is automatically driven to contract for avoiding during demolding, demolding and part taking are convenient, and the production efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an automotive injection mold that is easy to demold. Background Technology

[0002] Many automotive interior parts are made of plastic and are injection molded. An injection mold typically consists of an upper mold and a lower mold. When the upper and lower molds are joined, molten plastic enters the mold cavity surrounded by the upper and lower molds through the injection port. After the plastic cools and solidifies, the upper and lower molds separate, completing the mold opening. Then, the demolding mechanism separates the product from the mold. Some automotive interior parts have undercut structures on their inner edges. These undercut structures restrict the sliding of the molded parts along the demolding direction. For these parts with undercut structures, existing technologies generally use a slant bar and slider mechanism (e.g., as advertised). The utility model patent with CN221048923U discloses a related solution for demolding avoidance. However, this method has the following drawbacks: the slider must stop in the correct position when the mold is parted. If the slider slides forward or backward, it will cause the inclined rod and the hole to collide when the mold is closed. To avoid collision, the sliding parts are required to have high dimensional accuracy, and the friction coefficient of the contact surface needs to be designed accordingly (because there may be a certain inertial movement after the slider and the inclined rod are separated). This makes the design and processing of injection molds using this mechanism more difficult. Utility Model Content

[0003] The purpose of this invention is to provide an automotive injection mold that is easy to demold, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an automotive injection mold that facilitates demolding, comprising a rectangular front mold fixing plate and a rear mold fixing plate. A female mold is fixedly installed on the lower side of the front mold fixing plate. A through nozzle is fixedly installed in the middle of the front mold fixing plate and the female mold. Two symmetrical mold feet are fixedly installed on the front side of the rear mold fixing plate. A rear template is fixedly installed on the front side of the two mold feet. A rectangular ejector plate is provided on the front side of the rear template. Cylindrical mounting grooves are provided at the four corners of the front side of the rear template. A spring a is installed in the mounting groove. The front end of the spring a is fixedly connected to the ejector plate. A punch core is provided in the middle of the front side of the rear template. The outer side of the punch core, the ejector plate, and the female mold form a molding cavity.

[0005] The punch core consists of two protrusions and a cone. The cone is located between the two protrusions. The inclined surface of the cone is provided with a slider. The inner side of the protrusion is provided with a sliding groove. The slider and the sliding groove are adapted to slide and connect. The rear side of the protrusion is slidably connected to the rear template through a guide rail. A connecting rod is fixedly installed in the middle of the rear side of the cone. The connecting rod pulls the cone downward to move the two protrusions closer to each other to achieve demolding and avoidance.

[0006] Preferably, guide pillars are fixedly installed at the four rear corners of the master mold, and the rear ends of the guide pillars pass through the push plate, the rear template, and the mold foot in sequence and are slidably connected to them.

[0007] Preferably, it also includes an ejector plate, and four guide rods are fixedly connected between the front side of the rear mold fixing plate and the rear template. The guide rods pass through the ejector plate and are slidably connected to it. The rear end of the connecting rod passes through the rear template and is slidably connected to it. Racks a are fixedly installed on both sides of the rear end of the connecting rod along the length direction. Two symmetrical racks b are fixedly installed on the front side of the ejector plate. A rotatable gear is installed on the rear side of the rear template. The racks b and racks a are meshed and transmitted through the gear.

[0008] Preferably, a spring b is sleeved on the guide rod, the spring b is located on the front side of the ejector plate, and a through hole is provided in the middle of the rear mold fixing plate.

[0009] Compared with the prior art, the beneficial effects of this utility model are: this injection mold can injection mold parts with undercut structures, and automatically drives the punch core to retract and avoid the undercut during demolding, which facilitates demolding and part removal and helps improve production efficiency. There is no hole alignment step during mold closing, and the sliding parts do not require high dimensional accuracy, thus simplifying design and manufacturing. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0012] In the diagram: 1. Front mold fixing plate; 2. Female mold; 3. Rear mold fixing plate; 4. Mold foot; 5. Rear template; 6. Guide pillar; 7. Ejector plate; 8. Spring a; 9. Protrusion; 10. Frustum; 11. Ejector plate; 12. Guide rod; 13. Rack b; 14. Rack a; 15. Gear; 16. Connecting rod; 17. Spring b; 18. Slide groove. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Please see Figure 1-2 This utility model provides a technical solution: an easy-to-demold automotive injection mold, including a rectangular front mold fixing plate 1 and a rear mold fixing plate 3. A female mold 2 is fixedly installed on the lower side of the front mold fixing plate 1. A through nozzle is fixedly installed in the middle of the front mold fixing plate 1 and the female mold 2. The nozzle is used to dock with the injection molding machine during injection molding. Two symmetrical mold feet 4 are fixedly installed on the front side of the rear mold fixing plate 3. A rear template 5 is fixedly installed on the front side of the two mold feet 4. A rectangular ejector plate 7 is provided on the front side of the rear template 5. Cylindrical mounting grooves are provided at the four corners of the front side of the rear template 5. Springs a8 are installed in the mounting grooves. The front end of the springs a8 is fixedly connected to the ejector plate 7. Guide pillars 6 are fixedly installed at the four corners of the rear side of the female mold 2. The rear end of the guide pillars 6 passes through the ejector plate 7, the rear template 5, and the mold feet 4 in sequence and is slidably connected to them. The springs a8 are sleeved on the guide pillars 6. The front middle of the rear template 5 is provided with a punch core. The outer side of the punch core, the push plate 7, and the female mold 2 form a forming cavity. The lower end of the nozzle is connected to the forming cavity. The push plate 7 is located on the lower side of the undercut part.

[0015] The punch core consists of two protrusions 9 and a cone 10. The cone 10 is located between the two protrusions 9. The inclined surface of the cone 10 is provided with a slider. The inner side of the protrusion 9 is provided with a sliding groove 18. The slider and the sliding groove 18 are adapted to slide and connect. The rear side of the protrusion 9 is slidably connected to the rear template 5 through a guide rail. A connecting rod 16 is fixedly installed in the middle of the rear side of the cone 10. The connecting rod 16 pulls the cone 10 downward to move the two protrusions 9 closer to each other to achieve demolding and avoidance. The cone 10 and the two protrusions 9 always remain connected in the mold opening and closing state, which helps to ensure the positional accuracy of the protrusions 9.

[0016] It also includes an ejector plate 11. Four guide rods 12 are fixedly connected between the front side of the rear mold fixing plate 3 and the rear template 5. The guide rods 12 pass through the ejector plate 11 and are slidably connected to it. The rear end of the connecting rod 16 passes through the rear template 5 and is slidably connected to it. Racks a14 are fixedly installed on both sides of the rear end of the connecting rod 16 along the length direction. Two symmetrical racks b13 are fixedly installed on the front side of the ejector plate 11. A rotatable gear 15 is installed on the rear side of the rear template 5. The racks b13 and racks a14 are meshed and transmitted through the gear 15. A spring b17 is sleeved on the guide rod 12. The spring b17 is located on the front side of the ejector plate 11. The spring b17 is used to push the ejector plate 11 to move backward and reset. The middle part of the rear mold fixing plate 3 is provided with a through hole. When demolding, the moving mold moves backward, the ejector plate 11 moves forward, and the connecting rod 16 pulls the cone 10 to move backward.

[0017] Working principle: When in use, the mold is installed on the injection molding machine. The rear mold fixing plate 3 is pulled to move backward. When it moves to a certain position, the ejector pin pushes against the ejector plate 11 from the rear. The ejector plate 11 is pushed forward. The forward-moving rack b13 drives the rack a14 to move backward through the gear 15. Then the connecting rod 16 is pulled to extend backward. The cone 10 pulls the two protrusions 9 closer to each other to avoid the undercut part. Then the compressed spring a8 pushes the push plate 7 forward to eject the injection molded part, which is convenient for demolding and part removal.

[0018] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A car injection mold facilitating demolding, comprising a rectangular front mold fixed plate (1), a rear mold fixed plate (3), a female mold (2) fixedly installed on the lower side of the front mold fixed plate (1), a through nozzle fixedly installed on the middle part of the front mold fixed plate (1) and the female mold (2), two symmetrical mold feet (4) fixedly installed on the front side of the rear mold fixed plate (3), and a rear mold plate (5) fixedly installed on the front side of the two mold feet (4), characterized in that: The front side of the rear mold plate (5) is provided with a rectangular pushing plate (7), the four corners of the front side of the rear mold plate (5) are respectively provided with a cylindrical mounting groove, a spring a (8) is mounted in the mounting groove, the front end of the spring a (8) is fixedly connected with the pushing plate (7), and a male mold core is arranged at the middle of the front side of the rear mold plate (5), and the outer side of the male mold core is arranged between the pushing plate (7) and the female mold (2) to form a forming cavity. The male mold core is composed of two protrusions (9) and a frustum (10), the frustum (10) is located between the two protrusions (9), the inclined surface of the frustum (10) is provided with a sliding block, the inner side of the protrusion (9) is provided with a sliding groove (18), the sliding block and the sliding groove (18) are in sliding connection, the rear side of the protrusion (9) is in sliding connection with the rear mold plate (5) through a guide rail, the rear middle part of the frustum (10) is fixedly provided with a connecting rod (16), the frustum (10) is pulled downward by the connecting rod (16) to drive the two protrusions (9) to approach each other to realize demolding avoidance.

2. The automobile injection mold facilitating demolding according to claim 1, characterized in that: The rear side of the female mold (2) is fixedly provided with a guide column (6) at four corners, respectively, the rear end of the guide column (6) penetrates the pushing plate (7), the rear mold plate (5) and the mold foot (4) in sequence and is in sliding connection with them.

3. The automotive injection mold with easy mold release of claim 1, wherein: The front side of the rear mold fixing plate (3) is fixedly connected with four guide rods (12) between the rear mold plate (5), the guide rods (12) penetrate the thimble plate (11) and are in sliding connection with the thimble plate (11), the rear end of the connecting rod (16) penetrates the rear mold plate (5) and is in sliding connection with the rear mold plate (5), the rear end of the connecting rod (16) is fixedly provided with a rack a (14) on both sides along the length direction, the front side of the thimble plate (11) is fixedly provided with two symmetrical rack b (13), the rear side of the rear mold plate (5) is provided with a rotatable gear (15), the rack b (13) and the rack a (14) are in meshing transmission through the gear (15).

4. The automotive injection mold with easy mold release of claim 3, wherein: The guide rod (12) is sleeved with a spring b (17), the spring b (17) is located on the front side of the thimble plate (11), and the middle part of the rear mold fixing plate (3) is provided with a through hole.

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