Injection molding method for automobile tail door

Abstract

The invention discloses an automobile tail door injection molding method, which relates to the technical field of injection molding, and comprises the following steps: S1, controlling a lifting mechanism to drive an upper mold cavity to abut against a lower mold cavity at the top of a base, and in the process, enabling an ejector rod and a heat conduction block to be in full contact with a cooling liquid in the base through a demolding and heat conduction integrated mechanism; s2, injection molding materials are injected into the upper mold cavity and the lower mold cavity through a material injection pipe until the upper mold cavity and the lower mold cavity are full; s3, in the material injection process, the lower mold cavity and the upper mold cavity abutting against the lower mold cavity generate slight shock through the material uniformizing mechanism and the slight shock mechanism, and no gap exists between the injection molding material and the inner walls of the lower mold cavity and the upper mold cavity; according to the injection molding method for the automobile tail door, the cooling molding speed of the injection molding material located on the inner side of the lower mold cavity is increased, and the problem that when the injection molding material is injected into the lower mold cavity and the upper mold cavity, a gap exists between the injection molding material and the inner wall of the mold cavity is solved; and the problem that the demolding quality of the formed tail door part is influenced due to adhesion between the formed tail door part and the inner wall of the mold cavity during demolding is also avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to an injection molding method for an automobile tailgate. Background Art

[0002] Injection molding, also known as injection mold molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a variety of flower patterns and colors, shapes that can range from simple to complex, sizes that can range from large to small, precise product dimensions, easy product replacement, and the ability to form complex-shaped parts. Injection molding is suitable for molding processing fields such as mass production and complex-shaped products. At a certain temperature, the completely molten plastic material is injected into the mold cavity, and after cooling and solidification, the molded product is obtained.

[0003] During the injection molding process of an automobile tailgate, when injecting materials, there is an easy problem that gaps appear between the injected plastic and the inner wall of the mold cavity. After the injection is completed, the heat dissipation area is small, which affects the cooling and forming speed of the middle part inside the injected plastic. At the same time, there is also a problem that the adhesion between the tailgate part and the inner wall of the mold cavity is strong during demolding, which affects the demolding quality. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection molding method for an automobile tailgate to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An injection molding method for an automobile tailgate, including the following steps:

[0006] S1. Drive the upper mold cavity to abut against the lower mold cavity at the top of the base by controlling the lifting mechanism. During this process, make the ejector rod and the heat conduction block fully contact the coolant inside the base through the demolding and heat conduction integrated mechanism;

[0007] S2. Inject the injected plastic into the upper mold cavity and the lower mold cavity through the injection pipe until it is full;

[0008] S3. During the injection process, make the lower mold cavity and the upper mold cavity in contact with it generate micro-vibrations through the material leveling mechanism and the micro-vibration mechanism, so that when the injected plastic is injected into the lower mold cavity and the upper mold cavity, there will be no gaps between the injected plastic and the inner walls of the lower mold cavity and the upper mold cavity;

[0009] S4. After the injected plastic is cooled and formed, drive the upper mold cavity to move upward by controlling the lifting mechanism. During this process, simultaneously drive the heat conduction block and the ejector rod to move upward, eject the formed tailgate part inside the lower mold cavity. During this process, at the same time, drive the micro-vibration mechanism to make the lower mold cavity generate micro-vibrations, so that the formed tailgate part is quickly separated from the lower mold cavity;

[0010] The upper mold cavity is located directly above the lower mold cavity;

[0011] The lifting mechanism is installed on the top of the base;

[0012] The demolding and heat-conducting integrated mechanism is connected to the lower mold cavity, and is used for accelerating the cooling and molding of the injection plastic inside the lower mold cavity and ejecting the tailgate parts molded inside the lower mold cavity;

[0013] The micro-vibration mechanism is installed on the base, and is used for reducing the adhesion between the tailgate parts and the lower mold cavity during demolding;

[0014] The material leveling mechanism is connected to the micro-vibration mechanism, and is used for preventing gaps between the injection plastic and the inner walls of the lower mold cavity and the upper mold cavity during injection.

[0015] Further, the lifting mechanism includes four columns installed on the top of the base, a top seat fixedly connected to the tops of the four columns, a sliding seat slidably sleeved outside the four columns, and two hydraulic cylinders installed on the top seat. The extending ends of the two hydraulic cylinders are fixedly connected to the top of the sliding seat, and the upper mold cavity is installed at the bottom of the sliding seat.

[0016] Further, the demolding and heat-conducting integrated mechanism includes a one-way screw rotatably connected to the inner wall of the bottom of the base along the height direction of the base, a driving block screwed outside the one-way screw, a plurality of connecting components installed on the top of the driving block, a heat-conducting block installed on the plurality of connecting members, a plurality of ejector rods fixedly connected to the top of the heat-conducting block, and a linkage component for driving the one-way screw to rotate.

[0017] Further, sealing blocks are fixedly connected to the tops of the plurality of ejector rods, sealing grooves matching the plurality of sealing blocks are formed on the inner wall of the bottom of the lower mold cavity, a plurality of through grooves are formed at the bottom of the lower mold cavity, the plurality of through grooves are respectively located directly below the plurality of sealing grooves and are respectively communicated with the plurality of sealing grooves, and the plurality of ejector rods respectively penetrate through the plurality of through grooves.

[0018] Further, the connecting component includes a sealing cylinder fixedly connected to the top of the driving block, a slider slidably connected inside the sealing cylinder, a connecting rod fixedly connected to the top of the slider, and a spring fixedly connected to the bottom of the slider. The top end of the connecting rod is fixedly connected to the bottom of the heat-conducting block, and the bottom end of the spring is fixedly connected to the inner wall of the bottom of the sealing cylinder.

[0019] Further, the linkage component includes a light bar fixedly connected to the outer wall of one side of the sliding seat along the height direction of the base, a rack fixedly connected to the bottom end of the light bar, a first transmission shaft rotatably connected inside the base along the length direction of the base, and a first gear fixedly connected to the end of the first transmission shaft extending outside the base. The first gear is matched with the rack, and bevel gears are fixedly sleeved on the outer parts of the first transmission shaft and the one-way screw respectively, and the two bevel gears are meshed with each other.

[0020] Further, guide rods parallel to the one-way screw are arranged on both sides of the one-way screw. Both of the guide rods are fixedly connected to the inner wall of the bottom of the base, and the driving block is slidably sleeved outside the two guide rods.

[0021] Further, the micro-vibration mechanism includes a housing installed inside the base, a second transmission shaft rotatably connected inside the housing along the length direction of the base, a reciprocating screw fixedly connected to one end of the second transmission shaft close to the lower mold cavity, a linkage block screwed outside the reciprocating screw, and a knocking block fixedly connected to the linkage block. The top of the linkage block abuts against the inner wall of the top of the housing. One end of the knocking block close to the lower mold cavity is of a hemispherical structure. The knocking block is of a hollow structure, and a counterweight ball is arranged inside the knocking block. The other end of the second transmission shaft extends to the outside of the base and is fixedly connected with a second gear, and the second gear is matched with the rack.

[0022] Further, the material leveling mechanism includes a motor installed on the outer wall of the base and a third gear installed outside the output shaft of the motor, and the third gear meshes with the second gear.

[0023] Compared with the prior art, a method for injection molding an automobile tailgate provided by the present invention has the following

[0024] Beneficial effects:

[0025] 1. Through the cooperation of the components of the demolding and heat-conducting integrated mechanism, when the upper mold cavity and the lower mold cavity are closed, the ejector rod and the heat-conducting block are in full contact with the coolant inside the base, thereby greatly increasing the heat-conducting area of the lower mold cavity. At the same time, multiple ejector rods are distributed in a circular array and are located at a position close to the middle of the lower mold cavity, so the cooling and forming speed of the injection molding material located inside the lower mold cavity is effectively improved.

[0026] 2. Through the cooperation of the components of the material leveling mechanism and the demolding and heat-conducting integrated mechanism, during the injection process, the problem that there are gaps between the injection molding material and the inner wall of the mold cavity when the injection molding material is injected into the lower mold cavity and the upper mold cavity is avoided, thereby ensuring the injection molding effect.

[0027] 3. Through the cooperation of the components of the driving mechanism and the demolding and heat-conducting integrated mechanism, during demolding, the formed tailgate part can be quickly separated from the inner wall of the mold cavity, and then the tailgate part is ejected, avoiding the problem that the formed tailgate part affects its demolding quality due to the adhesion between it and the inner wall of the mold cavity during demolding.

[0028] 4. The injection mold in the present invention has a high degree of automation, a simple control method, does not require complex control systems and power equipment, has low production costs, high stability, and is easy to promote and use. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic diagram of the overall structure provided in Embodiment 1 of the present invention;

[0031] Figure 2 Schematic diagram of the internal structure of the base provided in Embodiment 1 of the present invention;

[0032] Figure 3 Schematic diagram of the lower die cavity and ejector rod structure provided in Embodiment 1 of the present invention;

[0033] Figure 4 Schematic diagram of the internal structure of the connection component provided in Embodiment 1 of the present invention;

[0034] Figure 5 Provided in Embodiment 1 of the present invention Figure 2 Enlarged schematic diagram of the structure at A in;

[0035] Figure 6 Schematic diagram of the micro-vibration mechanism structure provided in Embodiment 1 of the present invention;

[0036] Figure 7 Schematic diagram of the striking block and counterweight ball structure provided in Embodiment 1 of the present invention;

[0037] Figure 8 Schematic diagram of the material leveling mechanism structure provided in Embodiment 2 of the present invention.

[0038] Explanation of reference numerals:

[0039] 1. Base; 2. Lower die cavity; 3. Upper die cavity; 4. Injection pipe; 5. Column; 6. Top seat; 7. Slide seat; 8. Hydraulic cylinder; 9. One-way screw; 10. Driving block; 11. Heat conducting block; 12. Ejector rod; 13. Sealing block; 14. Sealing groove; 15. Sealing cylinder; 16. Slide block; 17. Connecting rod; 18. Spring; 19. Light bar; 20. Rack; 21. First transmission shaft; 22. First gear; 23. Bevel gear; 24. Guide rod; 25. Housing; 26. Second transmission shaft; 27. Reciprocating screw; 28. Linking block; 29. Striking block; 30. Counterweight ball; 31. Second gear; 32. Motor; 33. Third gear. Detailed implementation manners

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will further introduce the present invention in detail in conjunction with the drawings.

[0041] Example 1: Please refer to Figure 1-7 , an injection molding method for a car tailgate, comprising the following steps:

[0042] S1. Drive the upper mold cavity 3 to abut against the lower mold cavity 2 at the top of the base 1 by controlling the lifting mechanism. During this process, the ejector rod 12 and the heat conducting block 11 are in full contact with the coolant inside the base 1 through the demolding and heat conducting integrated mechanism, and the upper mold cavity 3 is located directly above the lower mold cavity 2;

[0043] S2. Inject injection molding material into the upper mold cavity 3 and the lower mold cavity 2 through the injection pipe 4 until it is full;

[0044] S3. During the injection process, make the lower mold cavity 2 and the upper mold cavity 3 in contact with it generate micro-vibrations through the material leveling mechanism and the micro-vibration mechanism, so that when the injection molding material is injected into the lower mold cavity 2 and the upper mold cavity 3, there is no gap between the injection molding material and the inner walls of the lower mold cavity 2 and the upper mold cavity 3;

[0045] S4. After the injection molding material is cooled and formed, drive the upper mold cavity 3 to move upward by controlling the lifting mechanism. During this process, synchronously drive the heat conducting block 11 and the ejector rod 12 to move upward, and eject the formed tailgate part inside the lower mold cavity 2. During this process, at the same time, drive the micro-vibration mechanism to make the lower mold cavity 2 generate micro-vibrations, so that the formed tailgate part is quickly separated from the lower mold cavity 2.

[0046] The lifting mechanism is installed at the top of the base 1 and is used to drive the upper mold cavity 3 to move. The lifting mechanism includes four columns 5 installed at the top of the base 1, a top seat 6 fixedly connected to the tops of the four columns 5, a sliding seat 7 slidably sleeved outside the four columns 5, and two hydraulic cylinders 8 installed on the top seat 6. The extending ends of the two hydraulic cylinders 8 are fixedly connected to the top of the sliding seat 7, and the upper mold cavity 3 is installed at the bottom of the sliding seat 7. Coolant is provided inside the base 1, and a circulation device is also connected to the outside of the base 1 for circulating and replacing the coolant inside the base 1 to prevent the temperature of the coolant from rising significantly after long-term use. The circulation device can be composed of a circulation pump, an external liquid storage tank, and heat dissipation fins installed on the liquid storage tank;

[0047] Drive the sliding seat 7 to move downward along the outer wall of the column 5 by controlling the hydraulic cylinder 8 to extend downward until the upper mold cavity 3 abuts against the lower mold cavity 2, and then inject injection molding material into the upper mold cavity 3 and the lower mold cavity 2 through the injection pipe 4. Drive the sliding seat 7 to move upward along the outer wall of the column 5 to reset by controlling the hydraulic cylinder 8 to shorten upward, and take out the injection molded tailgate part.

[0048] The demolding and heat-conducting integrated mechanism is connected to the lower die cavity 2, and is used to accelerate the cooling and molding of the injection molding material inside the lower die cavity 2 and eject the tailgate part molded inside the lower die cavity 2. The demolding and heat-conducting integrated mechanism includes a one-way screw 9 rotatably connected to the inner wall of the bottom of the base 1 along the height direction of the base 1, a driving block 10 screwed outside the one-way screw 9, a plurality of connecting components installed on the top of the driving block 10, a heat-conducting block 11 installed on the plurality of connecting members, a plurality of ejector rods 12 fixed to the top of the heat-conducting block 11, and a linkage component for driving the one-way screw 9 to rotate. Both the ejector rods 12 and the heat-conducting block 11 are made of a metal material with good heat conductivity and high melting point. When the upper die cavity 3 and the lower die cavity 2 are closed, the ejector rods 12 and the heat-conducting block 11 are in full contact with the coolant inside the base 1, thereby greatly increasing the heat-conducting area of the lower die cavity 2. At the same time, the plurality of ejector rods 12 are arranged in a circular array and are located near the middle of the lower die cavity 2, so the cooling and molding speed of the injection molding material located inside the lower die cavity 2 is effectively improved. The linkage component includes a light bar 19 fixedly connected to the outer wall of one side of the slide seat 7 along the height direction of the base 1, a rack 20 fixedly connected to the bottom end of the light bar 19, a first transmission shaft 21 rotatably connected to the inside of the base 1 along the length direction of the base 1, and a first gear 22 fixedly connected to the end of the first transmission shaft 21 extending outside the base 1. The first gear 22 is matched with the rack 20. Both the outer part of the first transmission shaft 21 and the one-way screw 9 are fixedly sleeved with bevel gears 23, and the two bevel gears 23 are meshed with each other;

[0049] When the slide seat 7 is driven to move upward, it drives the light bar 19 and the rack 20 to move upward synchronously. Through the meshing action between the rack 20 and the first gear 22, it drives the first transmission shaft 21 to rotate. Through the meshing action between the two bevel gears 23, it drives the one-way screw 9 to rotate, and then drives the driving block 10 to move upward. Thus, it drives the heat-conducting block 11 to move upward through the connecting components, and then drives the ejector rods 12 to move upward to eject the molded tailgate part inside the lower die cavity 2. When the rack 20 loses meshing with the first gear 22, the one-way screw 9 stops rotating, and the slide seat 7 continues to move upward to leave space for removing the tailgate part. On the contrary, when the slide seat 7 is driven to move downward, the light bar 19 and the rack 20 move downward accordingly. When the rack 20 meshes with the first gear 22 again, it drives the one-way screw 9 to rotate in the opposite direction, and then drives the driving block 10 to reset downward, thereby driving the ejector rods 12 to reset downward.

[0050] Sealing blocks 13 are fixedly connected to the tops of the plurality of ejector rods 12. Sealing grooves 14 that match the plurality of sealing blocks 13 are formed on the inner wall of the bottom of the lower die cavity 2. A plurality of through grooves are formed at the bottom of the lower die cavity 2. The plurality of through grooves are respectively located directly below the plurality of sealing grooves 14 and are respectively communicated with the plurality of sealing grooves 14. The plurality of ejector rods 12 respectively penetrate through the plurality of through grooves;

[0051] When the ejector rod 12 moves upward, the sealing block 13 disengages from the inside of the sealing groove 14 and lifts the formed tailgate part. When the ejector rod 12 resets downward, it drives the sealing block 13 to move back into the inside of the sealing groove 14 to seal the bottom of the lower die cavity 2.

[0052] Both sides of the one-way screw rod 9 are provided with guide rods 24 parallel to it. Both guide rods 24 are fixedly connected to the inner wall of the bottom of the base 1, and the driving block 10 is slidably sleeved outside the two guide rods 24;

[0053] When the one-way screw rod 9 rotates, the driving block 10 moves along the outer wall of the guide rod 24. The guide rod 24 is provided to ensure that the driving block 10 moves vertically without rotation.

[0054] The connecting component includes a sealing cylinder 15 fixedly connected to the top of the driving block 10, a slider 16 slidably connected inside the sealing cylinder 15, a connecting rod 17 fixedly connected to the top of the slider 16, and a spring 18 fixedly connected to the bottom of the slider 16. The top end of the connecting rod 17 is fixedly connected to the bottom of the heat conducting block 11, and the bottom end of the spring 18 is fixedly connected to the inner wall of the bottom of the sealing cylinder 15. The micro-vibration mechanism is installed on the base 1 to reduce the adhesion between the tailgate part and the lower die cavity 2 during demolding. The micro-vibration mechanism includes a housing 25 installed inside the base 1, a second transmission shaft 26 rotatably connected inside the housing 25 along the length direction of the base 1, a reciprocating screw rod 27 fixedly connected to one end of the second transmission shaft 26 close to the lower die cavity 2, a linkage block 28 screwed outside the reciprocating screw rod 27, and a knocking block 29 fixedly connected to the linkage block 28. The top of the linkage block 28 abuts against the inner wall of the top of the housing 25. One end of the knocking block 29 close to the lower die cavity 2 is of a hemispherical structure. The knocking block 29 is of a hollow structure, and a counterweight ball 30 is arranged inside the knocking block 29. The other end of the second transmission shaft 26 extends to the outside of the base 1 and is fixedly connected with a second gear 31, and the second gear 31 is matched with the rack 20;

[0055] The rack 20 is driven by the sliding seat 7 to move upward. Subsequently, the rack 20 re-engages with the second gear 31. Through the meshing effect between the rack 20 and the second gear 31, the second transmission shaft 26 is driven to rotate, and the reciprocating screw 27 rotates accordingly. Thereby, the linkage block 28 is driven to reciprocate along the outside of the reciprocating screw 27, and further drives the knocking block 29 to reciprocally collide with the lower die cavity 2, causing the lower die cavity 2 to generate micro-vibrations. During this process, the counterweight ball 30 inside the knocking block 29 impacts the lower die cavity 2 a second time under the influence of inertia, further causing the lower die cavity 2 to generate micro-vibrations, and then enabling the formed tailgate part to be quickly separated from the lower die cavity 2, avoiding the problem that the formed tailgate part affects its demolding quality due to adhesion to the inner wall of the lower die cavity 2 during demolding. It is worth mentioning that when the rack 20 moves upward, through the cooperation between the first gear 22, the first transmission shaft 21, the two bevel gears 23, and the one-way screw 9, when driving the driving block 10 to move upward, due to the elastic action of the spring 18 and the telescopic characteristic of the connecting rod 17, the ejector rod 12 is not in a rigid connection relationship with the formed tailgate part inside the lower die cavity 2. Furthermore, after the ejector rod 12 is subjected to the resistance of the tailgate part, it will stop moving upward. After the tailgate part is separated from the inner wall of the lower die cavity 2, it drives the tailgate part to move upward, further playing a role in protecting the tailgate part.

[0056] Embodiment 2: Please refer to Figure 8 , this embodiment provides a technical solution on the basis of Embodiment 1: The material leveling mechanism is connected to the micro-vibration mechanism for preventing gaps between the injection plastic and the inner walls of the lower die cavity 2 and the upper die cavity 3 during injection. The material leveling mechanism includes a motor 32 installed on the outer wall of the base 1 and a third gear 33 installed on the outer part of the output shaft of the motor 32. The output shaft of the motor 32 can rotate when the motor 32 is turned off, and the third gear 33 meshes with the second gear 31;

[0057] When the lower die cavity 2 and the upper die cavity 3 are closed and injection is carried out through the injection pipe 4, by starting the motor 32 to drive the third gear 33 installed on the outer part of its output shaft to rotate, through the meshing effect between the third gear 33 and the second gear 31, the second transmission shaft 26 is driven to rotate, and the reciprocating screw 27 rotates accordingly. Thereby, the linkage block 28 is driven to reciprocate along the outside of the reciprocating screw 27, and further drives the knocking block 29 to reciprocally collide with the lower die cavity 2, causing the lower die cavity 2 and the upper die cavity 3 in contact with it to generate micro-vibrations. During this process, the counterweight ball 30 inside the knocking block 29 impacts the lower die cavity 2 a second time under the influence of inertia, further causing the lower die cavity 2 and the upper die cavity 3 in contact with it to generate micro-vibrations, and then avoiding the problem of gaps between the injection plastic and the inner walls of the lower die cavity 2 and the upper die cavity 3 when the injection plastic is injected into the lower die cavity 2 and the upper die cavity 3, further improving the functionality of the micro-vibration mechanism.

[0058] Working principle: When in use, by controlling the hydraulic cylinder 8 to extend downward, the slide block 7 is driven to move downward along the outer wall of the column 5 until the upper mold cavity 3 abuts against the lower mold cavity 2. During this process, the light bar 19 and the rack 20 move downward accordingly. When the rack 20 meshes with the first gear 22 again, the one-way screw rod 9 is driven to rotate in the opposite direction, thereby driving the driving block 10 to reset downward, and then driving the ejector rod 12 to reset downward. The ejector rod 12 and the heat conducting block 11 are in full contact with the coolant inside the base 1, thus greatly increasing the heat conducting area of the lower mold cavity 2. At the same time, multiple ejector rods 12 are distributed in a circular array and are located near the middle of the lower mold cavity 2, so the cooling and molding speed of the injection plastic located inside the lower mold cavity 2 is effectively improved. Then, the injection plastic is injected into the upper mold cavity 3 and the lower mold cavity 2 through the injection pipe 4 until it is full. During the injection process, by starting the motor 32 to drive the third gear 33 outside its output shaft to rotate, through the meshing effect between the third gear 33 and the second gear 31, the second transmission shaft 26 is driven to rotate, and the reciprocating screw rod 27 rotates accordingly, thereby driving the linkage block 28 to reciprocate along the outside of the reciprocating screw rod 27, and then driving the knocking block 29 to reciprocally collide with the lower mold cavity 2, causing the lower mold cavity 2 and the upper mold cavity 3 in contact with it to generate micro-vibrations. During this process, the counterweight ball 30 inside the knocking block 29 impacts the lower mold cavity 2 a second time due to inertia, further causing the lower mold cavity 2 and the upper mold cavity 3 in contact with it to generate micro-vibrations, thereby avoiding the problem that there are gaps between the injection plastic and the inner walls of the lower mold cavity 2 and the upper mold cavity 3 when the injection plastic is injected into the lower mold cavity 2 and the upper mold cavity 3;

[0059] After the injection plastic is cooled and molded, by controlling the hydraulic cylinder 8 to shorten upward, the slide block 7 is driven to move upward along the outer wall of the column 5, driving the light bar 19 and the rack 20 to move upward synchronously. Through the meshing effect between the rack 20 and the first gear 22, the first transmission shaft 21 is driven to rotate. Through the meshing effect between the two bevel gears 23, the one-way screw rod 9 is driven to rotate, and then the driving block 10 is driven to move upward. Thus, the heat conducting block 11 is driven to move upward through the connecting component, and then the ejector rod 12 is driven to move upward, ejecting the formed tailgate part inside the lower mold cavity 2. When the rack 20 loses meshing with the first gear 22, the one-way screw rod 9 stops rotating, and the slide block 7 continues to move upward, leaving space for removing the tailgate part. At the same time, during this process, through the meshing effect between the rack 20 and the second gear 31, the second transmission shaft 26 is driven to rotate, and the reciprocating screw rod 27 rotates accordingly, thereby driving the linkage block 28 to reciprocate along the outside of the reciprocating screw rod 27, and then driving the knocking block 29 to reciprocally collide with the lower mold cavity 2, causing the lower mold cavity 2 to generate micro-vibrations. During this process, the counterweight ball 30 inside the knocking block 29 impacts the lower mold cavity 2 a second time due to inertia, further causing the lower mold cavity 2 to generate micro-vibrations, thereby enabling the formed tailgate part to be quickly separated from the lower mold cavity 2, avoiding the problem that the formed tailgate part affects its demolding quality due to adhesiveness with the inner wall of the lower mold cavity 2 during demolding.

[0060] Only certain exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, various different ways can be used to modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An injection molding method for a car tailgate, characterized in that, It includes the following steps: S1. Drive the upper mold cavity (3) to abut against the lower mold cavity (2) at the top of the base (1) by controlling the lifting mechanism. In this process, the ejector rod (12) and the heat-conducting block (11) are in full contact with the coolant inside the base (1) through the demolding and heat-conducting integrated mechanism; S2. Inject injection molding material into the upper mold cavity (3) and the lower mold cavity (2) through the injection pipe (4) until it is full; S3. During the injection process, make the lower mold cavity (2) and the upper mold cavity (3) in contact with it generate micro-vibrations through the material leveling mechanism and the micro-vibration mechanism, so that when the injection molding material is injected into the lower mold cavity (2) and the upper mold cavity (3), there is no gap between the injection molding material and the inner walls of the lower mold cavity (2) and the upper mold cavity (3); S4. After the injection molding material is cooled and formed, drive the upper mold cavity (3) to move upward by controlling the lifting mechanism. In this process, the heat-conducting block (11) and the ejector rod (12) are synchronously driven to move upward to eject the formed tailgate part inside the lower mold cavity (2). In this process, at the same time, drive the micro-vibration mechanism to make the lower mold cavity (2) generate micro-vibrations, so that the formed tailgate part is quickly separated from the lower mold cavity (2); The upper mold cavity (3) is located directly above the lower mold cavity (2). The lifting mechanism is installed at the top of the base (1). The demolding and heat-conducting integrated mechanism is connected to the lower mold cavity (2). The micro-vibration mechanism is installed on the base (1). The material leveling mechanism is connected to the micro-vibration mechanism.

2. The injection molding method for an automobile tailgate according to claim 1, characterized in that The lifting mechanism includes four columns (5) installed at the top of the base (1), a top seat (6) fixedly connected to the tops of the four columns (5), a sliding seat (7) slidably sleeved outside the four columns (5), and two hydraulic cylinders (8) installed on the top seat (6). The extending ends of the two hydraulic cylinders (8) are fixedly connected to the top of the sliding seat (7). The upper mold cavity (3) is installed at the bottom of the sliding seat (7).

3. A method for injection molding of an automobile tailgate according to claim 2, characterized in that, The demolding and heat-conducting integrated mechanism includes a one-way screw rod (9) rotatably connected to the inner wall of the bottom of the base (1) along the height direction of the base (1), a driving block (10) screwed outside the one-way screw rod (9), a plurality of connecting components installed on the top of the driving block (10), a heat-conducting block (11) installed on the plurality of connecting pieces, a plurality of ejector rods (12) fixedly connected to the top of the heat-conducting block (11), and a linkage component for driving the one-way screw rod (9) to rotate.

4. A method for injection molding of an automobile tailgate according to claim 3, characterized in that, Sealing blocks (13) are fixedly connected to the tops of the plurality of ejector rods (12). Sealing grooves (14) matching the plurality of sealing blocks (13) are formed on the inner wall of the bottom of the lower mold cavity (2). A plurality of through grooves are formed at the bottom of the lower mold cavity (2). The plurality of through grooves are respectively located directly below the plurality of sealing grooves (14) and are respectively communicated with the plurality of sealing grooves (14). The plurality of ejector rods (12) respectively penetrate through the plurality of through grooves.

5. A method for injection molding of an automobile tailgate according to claim 4, characterized in that, The connecting component includes a sealing cylinder (15) fixedly connected to the top of the driving block (10), a slider (16) slidably connected inside the sealing cylinder (15), a connecting rod (17) fixedly connected to the top of the slider (16), and a spring (18) fixedly connected to the bottom of the slider (16). The top end of the connecting rod (17) is fixedly connected to the bottom of the heat-conducting block (11), and the bottom end of the spring (18) is fixedly connected to the inner wall of the bottom of the sealing cylinder (15).

6. A method for injection molding of an automobile tailgate according to claim 5, characterized in that, The linkage component includes a light bar (19) fixedly connected to the outer wall of one side of the sliding seat (7) along the height direction of the base (1), a rack (20) fixedly connected to the bottom end of the light bar (19), a first transmission shaft (21) rotatably connected inside the base (1) along the length direction of the base (1), and a first gear (22) fixedly connected to one end of the first transmission shaft (21) extending outside the base (1). The first gear (22) is engaged with the rack (20), and both the first transmission shaft (21) and the outside of the one-way screw (9) are fixedly sleeved with bevel gears (23), and the two bevel gears (23) are engaged with each other.

7. A method for injection molding of an automobile tailgate according to claim 6, characterized in that, Both sides of the one-way screw (9) are provided with guide rods (24) parallel to it, and the two guide rods (24) are both fixedly connected to the inner wall of the bottom of the base (1). The driving block (10) is slidably sleeved outside the two guide rods (24).

8. A method for injection molding of an automobile tailgate according to claim 7, characterized in that, The micro-vibration mechanism includes a housing (25) installed inside the base (1), a second transmission shaft (26) rotatably connected inside the housing (25) along the length direction of the base (1), a reciprocating screw (27) fixedly connected to one end of the second transmission shaft (26) close to the lower mold cavity (2), a linkage block (28) screwed on the outside of the reciprocating screw (27), and a knocking block (29) fixedly connected to the linkage block (28). The top of the linkage block (28) abuts against the inner wall of the top of the housing (25). One end of the knocking block (29) close to the lower mold cavity (2) is of a hemispherical structure. The knocking block (29) is of a hollow structure, and a counterweight ball (30) is arranged inside the knocking block (29). The other end of the second transmission shaft (26) extends outside the base (1) and is fixedly connected with a second gear (31), and the second gear (31) is engaged with the rack (20).

9. A method for injection molding of an automobile tailgate according to claim 8, characterized in that, The material leveling mechanism includes a motor (32) installed on the outer wall of the base (1) and a third gear (33) installed on the outside of the output shaft of the motor (32). The third gear (33) is engaged with the second gear (31).

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