Injection molding mold for automobile protection plate and molding process of injection molding mold

Abstract

The invention relates to the technical field of injection molding molds, and discloses an injection molding mold for an automobile protection plate, the injection molding mold comprises two mounting bottom boxes and two mold mounting boxes, the two mold mounting boxes are correspondingly arranged up and down, and the molding mold assembly is arranged on the two mounting bottom boxes and the two mold mounting boxes. The forming mold assembly comprises a mounting box, the mounting box is fixedly connected to the interior of the mold mounting box, and heating areas are formed at intervals between the lower surface, the front and rear surfaces and the left and right sides of the mounting box and the interior of the mold mounting box. The heating temperature and the cooling speed can be flexibly adjusted according to the characteristics of injection molding materials, and the molding requirements of automobile protection plates made of different materials are met; and the vibration motor is arranged, so that the problems of easy generation of bubbles and material shortage in traditional injection molding are effectively solved, and the practicability of the injection molding mold for the automobile protection plate is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding dies, in particular to an injection molding die for an automobile guard plate and a molding process thereof. Background Art

[0002] In the field of automotive parts injection molding, automobile guard plates are key components that protect the car body and reduce air resistance. Their molding quality (such as dimensional accuracy, structural integrity, and surface finish) directly affects the assembly performance and service life of the entire vehicle.

[0003] However, existing automotive guard plate injection molding molds cannot be heated before injection molding and use natural cooling. When the initial mold temperature is low (close to ambient temperature), when the high-temperature molten material is injected into the cavity, the material will cool down instantly due to rapid contact with the low-temperature mold surface, and its fluidity will drop sharply. This makes it difficult for the material to fully fill the complex structure of the guard plate (such as ribs, corners, and protrusions), which can easily lead to material shortages, bubbles, or blurred contours. Especially for guard plates with small clips or deep cavities, the unfilled areas may directly affect assembly, resulting in the guard plate being unable to fit the car body. In addition, natural cooling relies on passive heat dissipation from the ambient temperature, and the cooling rate is slow and uncontrollable, which greatly extends the molding cycle (several times longer than active cooling time), seriously reducing production efficiency. More importantly, the cooling process is extremely uneven because the thick-walled areas of the guard plate dissipate heat slowly, while the thin-walled areas dissipate heat quickly. This temperature difference causes inconsistent shrinkage in different parts, generating significant internal stress, and ultimately causing the guard plate to warp and twist, thereby reducing the molding quality. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present invention provides an injection molding mold for automobile guard plates and a molding process thereof, which solves the problem that the existing automobile guard plate injection molding mold cannot be lifted and heated before injection and adopts natural cooling.

[0006] (2) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: an injection molding die for an automobile fender, comprising two mounting bottom boxes and two mold mounting boxes, the two mold mounting boxes being arranged in correspondence with each other;

[0008] The forming mold assembly is arranged on two mounting bottom boxes and two mold mounting boxes, and the forming mold assembly includes mounting boxes;

[0009] The installation box is fixedly connected to the interior of the mold installation box, and the lower surface, front and rear surfaces, and left and right sides of the installation box form a heating zone with the interior of the mold installation box.

[0010] Among them, a plurality of heating plates are fixedly connected to the lower surface of the installation box, a mold is fixedly connected to the interior of the installation box, and a cooling zone is formed between the lower surface of the mold and the front and rear surfaces as well as the left and right sides and the interior of the installation box.

[0011] Preferably, a plurality of heat conducting plates are fixedly connected to the lower surface of the mold, and the plurality of heat conducting plates are fixedly connected to the interior of the mounting box, and the internal structures of the two mold mounting boxes are the same.

[0012] Preferably, the mold located above is an upper mold, the mold located below is a lower mold, and four guide holes are opened on the upper surface of the mold installation box located above;

[0013] The inner walls of the four guide holes are slidably connected with guide rods, and the upper ends of the four guide rods are fixedly connected to the mold installation box located above.

[0014] Preferably, an injection tube is fixedly connected to the upper surface of the mold installation box located above, and the lower end of the injection tube passes through the interior of the corresponding mold;

[0015] The rear surfaces of the two mold installation boxes are fixedly connected with water outlet pipes, and the front ends of the two water outlet pipes respectively penetrate into the interior of the corresponding installation box.

[0016] Preferably, the front surfaces of the two mold installation boxes are fixedly connected with water inlet pipes, and the rear ends of the two water inlet pipes respectively penetrate into the interior of the corresponding installation boxes, and two vibration motors are fixedly installed on the lower surface of the lower mold installation box.

[0017] Preferably, two L-shaped mounting plates are fixedly connected to the lower surface of the mold mounting box located below, and the upper surfaces of the two L-shaped mounting plates are fixedly connected to the cylinder mounting box;

[0018] The first cylinder is fixedly connected to the interior of each of the four cylinder mounting boxes.

[0019] Preferably, the telescopic ends of the four first cylinders slide through the upper surface of the corresponding cylinder mounting box respectively;

[0020] Among them, two L-shaped plates are fixedly connected to the upper surface of the upper mold installation box, and the telescopic ends of the four first cylinders are fixedly connected to the corresponding L-shaped plates respectively.

[0021] Preferably, the forming die assembly further comprises a fixing plate fixedly connected to the upper surfaces of the two mounting bottom boxes;

[0022] Among them, four auxiliary springs are fixedly connected to the upper surface of the fixed plate, and the upper ends of the four auxiliary springs are fixedly connected to the mold installation box located below.

[0023] Preferably, the four auxiliary springs are each provided with an auxiliary telescopic rod, the lower ends of the four auxiliary telescopic rods are each fixedly connected to the fixed plate, and the telescopic ends of the four auxiliary telescopic rods are each fixedly connected to the mold installation box located below;

[0024] Two second cylinders are fixedly installed inside the two mounting bottom boxes, and the telescopic ends of the four second cylinders slide through the upper surface of the fixed plate;

[0025] Among them, the lower surfaces of the two L-shaped mounting plates are each provided with a support plate, and the telescopic ends of the four second cylinders are respectively fixed to the corresponding support plates, and the two support plates play a supporting role during mold closing.

[0026] An injection molding process for automobile guard plates comprises the following steps:

[0027] S1: Preparation: When closing the mold, the four second cylinders cooperate with the two support plates to support the two L-shaped mounting plates, and then support the mold mounting box located below;

[0028] The two external cooling water pipes are connected to the two water inlet pipes respectively, and the two external drainage pipes are connected to the two water outlet pipes respectively.

[0029] S2: When closing the mold, the telescopic ends of the four first cylinders are retracted synchronously, pushing the mold installation box located above to move downward. At this time, the four guide rods slide along the inner walls of the corresponding guide holes. The cooperation between the guide rods and the guide holes ensures that the upper and lower molds are accurately aligned, avoiding misalignment during mold closing and resulting in dimensional deviation of the guard plate.

[0030] Among them, the four second cylinders keep the telescopic ends in an extended state at the same time, and continuously apply upward supporting force to the two L-shaped mounting plates through the support plates to offset the pressure during mold closing and ensure that the lower mold mounting box is stable and motionless until the upper mold and the lower mold are completely fitted and the mold closing is completed.

[0031] S3: After the mold is closed, the four second cylinders are started to reset;

[0032] Among them, multiple heating plates on the lower surface of the installation box are then started, and the heat generated by the heating plates is transferred to the heating zone through the mold installation box to preheat the upper and lower molds so that the mold temperature reaches the melting temperature required for the injection molding material (such as the suitable injection molding temperature of the plastic material).

[0033] Among them, multiple heat conduction plates evenly transfer heat to all parts of the mold, ensuring a consistent temperature on the inner wall of the mold cavity, thus preventing the injection material from solidifying prematurely due to local low temperature, which would affect the filling effect.

[0034] S4: After the mold is preheated, the molten injection material is injected into the cavity formed by the upper mold and the lower mold through the injection tube, and the two vibration motors located in the lower mold installation box are started at the same time.

[0035] Among them, the high-frequency vibration generated by the vibration motor is transmitted to the cavity through the mold mounting box, so that the molten material overcomes the fluidity resistance under the action of vibration, fully fills the edges, corners, protrusions and other complex structures of the cavity, and reduces defects such as bubbles and material shortages. At this time, the heat conduction plate assists the transmission of vibration energy to make the material filling more uniform.

[0036] S5: After the injection molding is completed, keep the vibration motor working for a while. After the material is initially distributed inside the cavity, turn off the heating plate and supply cooling water to the cooling area of ​​the installation box through the two water inlet pipes.

[0037] Among them, cooling water circulates in the cooling zone, absorbing the heat of the material inside the mold and cavity. The heat is discharged with the water flow through the outlet pipe. The heat conduction plate accelerates the transfer of heat from the material to the cooling water, so that the material can be quickly cooled and shaped. The uniform heat conduction prevents the guard plate from being deformed due to internal stress caused by local excessive cooling.

[0038] S6: After the material is completely cooled and formed, the vibration motor is turned off, and the telescopic ends of the four first cylinders rise synchronously, driving the upper mold installation box to move upward.

[0039] S7: After the mold is opened, the molded car guard plate can be taken out from the lower mold, completing the injection molding process.

[0040] (3) Beneficial effects

[0041] Compared with the prior art, the present invention provides an injection molding die and molding process for an automobile guard plate, which has the following beneficial effects:

[0042] 1. This injection molding mold for automobile guard plates can flexibly adjust the heating temperature and cooling speed according to the characteristics of the injection molding material by setting independent operation of the heating zone and cooling zone, adapting to the molding needs of automobile guard plates of different materials. The setting of the vibration motor effectively solves the problems of bubbles and material shortages that are prone to occur in traditional injection molding, thereby improving the practicality of the injection molding mold for automobile guard plates.

[0043] 2. In this injection molding mold for automobile guard plates, the four second cylinders keep the telescopic ends extended, and continuously apply upward support force to the two L-shaped mounting plates through the support plates to offset the pressure during mold closing and ensure that the lower mold mounting box is stable and motionless until the upper and lower molds are fully fitted and the mold closing is completed.

[0044] 3. The injection molding mold for automobile guard plates uses multiple heat conducting plates to evenly transfer heat to all parts of the mold, ensuring a consistent temperature on the inner wall of the mold cavity, thus avoiding premature solidification of the injection molding material due to local low temperature, which would affect the filling effect.

[0045] 4. This injection molding process for automotive guard plates utilizes a heating plate in the heating zone to generate heat, and uses multiple heat-conducting plates to evenly transfer heat to all parts of the mold, ensuring a consistent temperature on the inner wall of the mold cavity. This prevents premature solidification of the injection molding material due to local low temperatures, ensuring that the molten material can smoothly fill the cavity. This process is particularly suitable for the molding needs of guard plates with complex structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the overall structure of the injection molding die for automobile guard plate of the present invention;

[0047] Figure 2 The right side schematic diagram of the present invention as a whole;

[0048] Figure 3 This is a schematic diagram of the position of the vibration motor of the present invention;

[0049] Figure 4 This is a schematic diagram of the position of the guide hole of the present invention;

[0050] Figure 5 This is a schematic diagram of the lower surface of the installation box of the present invention;

[0051] Figure 6 This is a schematic diagram of the position of the heat conducting plate of the present invention;

[0052] Figure 7 This is a schematic diagram of the position of the guide rod of the present invention.

[0053] In the figure: 1. Installation base box; 2. Fixing plate; 3. Cylinder installation box; 4. Guide rod; 5. First cylinder; 6. L-shaped plate; 7. Injection tube; 8. Water inlet pipe; 9. Auxiliary spring; 10. Second cylinder; 11. L-shaped installation plate; 12. Mold installation box; 13. Support plate; 14. Vibration motor; 15. Guide hole; 16. Installation box; 17. Mold; 18. Heating plate; 19. Water outlet pipe; 20. Heat conduction plate; 21. Auxiliary telescopic rod. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] See also Figure 1-7 The present invention provides a new technical solution: an injection molding mold for an automobile guard plate, comprising two mounting bottom boxes 1 and two mold mounting boxes 12, the two mold mounting boxes 12 being arranged correspondingly up and down, a molding mold assembly, the molding mold assembly being arranged on the two mounting bottom boxes 1 and the two mold mounting boxes 12, and the molding mold assembly including a mounting box 16;

[0056] The mounting box 16 is fixedly connected to the interior of the mold mounting box 12, and the lower surface, front and rear surfaces, and left and right sides of the mounting box 16 and the interior of the mold mounting box 12 form a heating zone;

[0057] Among them, multiple heating plates 18 are fixedly connected to the lower surface of the installation box 16, and a mold 17 is fixedly connected to the inside of the installation box 16. The lower surface of the mold 17 and the gaps between the front and rear surfaces and the left and right sides and the inside of the installation box 16 form a cooling zone.

[0058] Furthermore, a plurality of heat conducting plates 20 are fixedly connected to the lower surface of the mold 17 , and the plurality of heat conducting plates 20 are fixedly connected to the interior of the mounting box 16 . The internal structures of the two mold mounting boxes 12 are the same.

[0059] Furthermore, the mold 17 located above is the upper mold, the mold 17 located below is the lower mold, and the upper surface of the mold mounting box 12 located above is provided with four guide holes 15;

[0060] The inner walls of the four guide holes 15 are all slidably connected to the guide rods 4 , and the upper ends of the four guide rods 4 are all fixedly connected to the mold installation box 12 located above.

[0061] Furthermore, an injection tube 7 is fixedly connected to the upper surface of the mold installation box 12 located above, and the lower end of the injection tube 7 passes through the interior of the corresponding mold 17;

[0062] The rear surfaces of the two mold installation boxes 12 are fixedly connected with water outlet pipes 19 , and the front ends of the two water outlet pipes 19 respectively penetrate into the interior of the corresponding installation box 16 .

[0063] Furthermore, the front surfaces of the two mold installation boxes 12 are fixedly connected with water inlet pipes 8, and the rear ends of the two water inlet pipes 8 respectively pass through the interior of the corresponding installation boxes 16. Two vibration motors 14 are fixedly installed on the lower surface of the lower mold installation box 12.

[0064] Furthermore, two L-shaped mounting plates 11 are fixedly connected to the lower surface of the mold mounting box 12 below, and the upper surfaces of the two L-shaped mounting plates 11 are fixedly connected to the cylinder mounting box 3;

[0065] The first cylinder 5 is fixedly connected to the interior of each of the four cylinder mounting boxes 3 .

[0066] Furthermore, the telescopic ends of the four first cylinders 5 slide through the upper surface of the corresponding cylinder mounting box 3;

[0067] Among them, two L-shaped plates 6 are fixedly connected to the upper surface of the upper mold installation box 12, and the telescopic ends of the four first cylinders 5 are fixedly connected to the corresponding L-shaped plates 6 respectively.

[0068] Furthermore, the forming die assembly further comprises a fixing plate 2, which is fixedly connected to the upper surfaces of the two mounting bottom boxes 1;

[0069] Among them, four auxiliary springs 9 are fixedly connected to the upper surface of the fixed plate 2, and the upper ends of the four auxiliary springs 9 are fixedly connected to the mold installation box 12 located below.

[0070] Furthermore, the four auxiliary springs 9 are each provided with an auxiliary telescopic rod 21, the lower ends of the four auxiliary telescopic rods 21 are fixedly connected to the fixed plate 2, and the telescopic ends of the four auxiliary telescopic rods 21 are fixedly connected to the mold installation box 12 located below;

[0071] Among them, two second cylinders 10 are fixedly installed inside the two installation bottom boxes 1, and the telescopic ends of the four second cylinders 10 slide through the upper surface of the fixed plate 2;

[0072] Among them, the lower surfaces of the two L-shaped mounting plates 11 are each provided with a support plate 13, and the telescopic ends of the four second cylinders 10 are respectively fixed to the corresponding support plates 13. The two support plates 13 are fitted with the lower surface of the L-shaped mounting plate 11 when the mold is closed, and the thrust of the second cylinder 10 offsets the pressure of the mold closing, thereby playing a supporting role.

[0073] An injection molding process for automobile guard plates comprises the following steps:

[0074] S1: Preparation: When closing the mold, the four second cylinders 10 cooperate with the two support plates 13 to support the two L-shaped mounting plates 11, and further support the mold mounting box 12 located below;

[0075] Among them, the two external cooling water pipes are connected to the two water inlet pipes 8 respectively, and the two external drainage pipes are connected to the two water outlet pipes 19 respectively;

[0076] S2: When closing the mold, the telescopic ends of the four first cylinders 5 are retracted synchronously, pushing the mold installation box 12 located above to move downward. At this time, the four guide rods 4 slide along the inner walls of the corresponding guide holes 15. The cooperation between the guide rods 4 and the guide holes 15 ensures that the upper mold and the lower mold are accurately aligned, avoiding misalignment during mold closing and resulting in deviation in the molded dimensions of the guard plate;

[0077] At the same time, the four second cylinders 10 keep their telescopic ends extended, and continuously apply upward supporting force to the two L-shaped mounting plates 11 through the support plate 13 to offset the pressure during mold closing and ensure that the lower mold mounting box 12 is stable and motionless until the upper mold and the lower mold are completely fitted together and the mold closing is completed;

[0078] S3: After the mold is closed, the four second cylinders 10 are started to reset;

[0079] Then, the multiple heating plates 18 on the lower surface of the installation box 16 are started. The heat generated by the heating plates 18 is transferred to the heating zone through the mold installation box 12 to preheat the upper and lower molds 17 so that the temperature of the molds 17 reaches the melting temperature required by the injection molding material (such as the suitable injection molding temperature of the plastic material);

[0080] Among them, multiple heat conducting plates 20 evenly conduct heat to all parts of the mold 17, ensuring that the temperature of the inner wall of the mold cavity is consistent, avoiding premature solidification of the injection material due to local low temperature, which affects the filling effect;

[0081] S4: After the mold is preheated, the molten injection material is injected into the cavity formed by the upper mold and the lower mold through the injection pipe 7, and the two vibration motors 14 located in the lower mold installation box 12 are started at the same time;

[0082] Among them, the high-frequency vibration generated by the vibration motor 14 is transmitted to the cavity through the mold mounting box 12, so that the molten material overcomes the fluidity resistance under the action of vibration, fully fills the corners, protrusions and other complex structures of the cavity, reduces bubbles, material shortages and other defects, and the heat conduction plate 20 assists the transmission of vibration energy at this time to make the material filling more uniform.

[0083] S5: After the injection molding is completed, the vibration motor 14 is kept working for a while. After the material is initially distributed inside the cavity, the heating plate 18 is turned off and cooling water is introduced into the cooling area of ​​the installation box 16 through the two water inlet pipes 8;

[0084] The cooling water circulates in the cooling zone, absorbing heat from the mold 17 and the material inside the cavity. The heat is discharged with the water through the outlet pipe 19. The heat conducting plate 20 accelerates the transfer of heat from the material to the cooling water, allowing the material to quickly cool down and set. The uniform heat conduction prevents deformation of the guard plate caused by internal stress due to localized excessive cooling.

[0085] S6: After the material is completely cooled and formed, the vibration motor 14 is turned off, and the telescopic ends of the four first cylinders 5 rise synchronously, driving the upper mold installation box 12 to move upward;

[0086] S7: After the mold is opened, the molded car guard plate can be taken out from the lower mold, completing the injection molding process;

[0087] By setting the heating zone and cooling zone to work independently, the heating temperature and cooling speed can be flexibly adjusted according to the characteristics of the injection molding material, adapting to the molding requirements of automobile guard plates of different materials. The provision of the vibration motor 14 effectively solves the problems of bubbles and material shortages that are easily generated in traditional injection molding, thereby improving the practicality of the injection molding mold for automobile guard plates.

[0088] Among them, the production process uses the heating plate in the heating zone to generate heat, and cooperates with multiple heat-conducting plates to evenly transfer heat to various parts of the mold, ensuring that the temperature of the inner wall of the mold cavity is consistent, avoiding premature solidification of the injection molding material due to local low temperature, and ensuring that the molten material can smoothly fill the cavity. It is especially suitable for the molding needs of complex structure guard plates.

[0089] Structure Description:

[0090] Cylinder mounting box 3:

[0091] It is fixed on the upper surface of the L-shaped mounting plate 11 and has the first cylinder 5 installed inside to protect the cylinder from external impurities, ensure the smooth movement of the telescopic end of the cylinder, and provide a sealed power space for the lifting and lowering of the mold mounting box 12.

[0092] Guide rod 4:

[0093] The lower end is slidably connected to the guide hole 15, and the upper end is fixed to the upper mold installation box 12. As the first cylinder 5 extends and retracts, the upper mold installation box is driven to rise and fall. The guide hole guides the upper and lower molds 17 to ensure precise alignment when closing the mold to avoid misalignment.

[0094] First cylinder 5:

[0095] It is installed in the cylinder mounting box 3, and the telescopic end is connected to the L-shaped plate 6 to drive the upper mold mounting box 12 to move up and down to realize the closing and opening of the upper and lower molds. Its synchronous telescopic movement ensures that the mold is evenly stressed and avoids deformation of the cavity.

[0096] L-shaped plate 6:

[0097] It is fixed on the upper surface of the upper mold installation box 12, and its lower end is connected to the telescopic end of the first cylinder 5, transmitting the vertical driving force of the cylinder to the upper mold installation box, thereby enhancing the connection stability between the mold installation box and the cylinder.

[0098] Injection tube 7:

[0099] It is fixed on the upper surface of the upper mold mounting box 12, and its lower end passes through the upper mold 17, and is used to inject molten injection molding material into the cavity formed by the upper and lower molds. Its diameter matches the material fluidity to ensure rapid filling of the cavity.

[0100] Water inlet pipe 8:

[0101] It is fixed on the front surface of the mold installation box 12, and its rear end passes through the cooling zone of the installation box 16. Cooling water is introduced into the cooling zone to absorb the heat of the mold 17 and the injection material, accelerating the cooling and shaping of the material.

[0102] Auxiliary spring 9:

[0103] It is sleeved on the outside of the auxiliary telescopic rod 21, with both ends connecting the fixed plate 2 and the mold installation box 12 below, buffering the high-frequency vibration of the vibration motor 14, reducing the impact of vibration on the installation bottom box, and assisting the mold installation box to reset.

[0104] Second cylinder 10:

[0105] Installed inside the installation bottom box 1, the telescopic end passes through the fixed plate 2 and connects to the support plate 13. When the mold is closed, it extends to push the support plate to support the L-shaped installation plate 11, offsetting the mold closing pressure and ensuring that the mold installation box 12 below is stable and motionless.

[0106] L-shaped mounting plate 11:

[0107] It is fixed on the lower surface of the lower mold installation box 12, and the cylinder installation box 3 is installed on the upper surface. The L-shaped structure adapts to the position of the mold installation box and the cylinder, and transmits the driving force of the first cylinder 5 to the upper mold installation box.

[0108] Mould installation box 12:

[0109] The upper and lower parts are arranged correspondingly, and the interior accommodates the installation box 16 and the mold 17. The upper mold installation box connects the guide rod 4 and the injection tube 7, and the lower mold installation box is installed with the vibration motor 14 and the L-shaped installation plate 11. It is the installation carrier of the mold and the driving components.

[0110] Support plate 13:

[0111] Located below the L-shaped mounting plate 11, it is connected to the telescopic end of the second cylinder 10. When the mold is closed, it supports the L-shaped mounting plate under the push of the second cylinder, thereby enhancing the bearing capacity of the mold mounting box below and avoiding deformation caused by the mold closing pressure.

[0112] Vibration motor 14:

[0113] It is fixed on the lower surface of the mold mounting box 12 below, generates high-frequency vibration and transmits it to the cavity, so that the molten injection material fills the complex structures such as the corners and protrusions of the cavity under the action of vibration, reducing bubbles and material shortage defects.

[0114] Guide hole 15:

[0115] The upper surface of the upper mold installation box 12 is opened, and the inner wall is slidably connected to the guide rod 4, providing a lifting track for the guide rod to ensure the coaxiality of the upper and lower molds 17 when closing the mold and improve the cavity size accuracy.

[0116] Installation box 16:

[0117] It is fixed inside the mold installation box 12, and the lower surface and the surrounding space with the mold installation box form a heating zone, and the space between the inside and the mold 17 forms a cooling zone, which respectively accommodates the heating plate 18 and cooling water to achieve heating and cooling of the mold.

[0118] Mold 17:

[0119] The upper mold is fixed in the upper mounting box 16, and the lower mold is fixed in the lower mounting box 16. When the molds are closed, an injection molding cavity is formed. The inner wall contour of the cavity is consistent with the shape of the automobile guard plate, and the cavity is the core component of the guard plate molding.

[0120] Heating plate 18:

[0121] It is fixed on the lower surface of the mounting box 16 and is located in the heating zone. When powered on, it generates heat and transfers it to the mold 17 through the mounting box, preheating the mold to the required melting temperature of the injection material to ensure smooth material filling.

[0122] Outlet pipe 19:

[0123] It is fixed on the rear surface of the mold installation box 12, and its front end is connected to the cooling area of ​​the installation box 16. It discharges the cooling water after absorbing heat and forms a cycle with the water inlet pipe 8 to maintain the cooling efficiency of the cooling area.

[0124] Heat conducting plate 20:

[0125] It is fixed on the lower surface of the mold 17 and inside the mounting box 16 to accelerate the heat transfer from the heating plate 18 to the mold, while promoting the heat of the mold and injection material to diffuse to the cooling water, ensuring uniform mold temperature and avoiding uneven material cooling.

[0126] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding die for automobile guard plate, characterized in that: include: Two installation bottom boxes (1) and two mold installation boxes (12), the two mold installation boxes (12) are arranged correspondingly up and down; A forming die assembly, the forming die assembly is arranged on two mounting bottom boxes (1) and two die mounting boxes (12), and the forming die assembly includes a mounting box (16); The mounting box (16) is fixedly connected to the interior of the mold mounting box (12), and a heating zone is formed between the lower surface and the front and rear surfaces of the mounting box (16) and the left and right sides and the interior of the mold mounting box (12); The lower surface of the installation box (16) is fixedly connected to a plurality of heating plates (18), the interior of the installation box (16) is fixedly connected to a mold (17), and the lower surface of the mold (17) and the intervals between the front and rear surfaces and the left and right sides and the interior of the installation box (16) form a cooling zone.

2. The injection molding die for automobile fender according to claim 1, characterized in that: The lower surface of the mold (17) is fixedly connected with a plurality of heat conducting plates (20), and the plurality of heat conducting plates (20) are fixedly connected to the interior of the installation box (16). The internal structures of the two mold installation boxes (12) are the same.

3. The injection molding die for automobile fender according to claim 2, characterized in that: The mold (17) located above is an upper mold, the mold (17) located below is a lower mold, and four guide holes (15) are opened on the upper surface of the mold installation box (12) located above; The inner walls of the four guide holes (15) are all slidably connected to guide rods (4), and the upper ends of the four guide rods (4) are all fixedly connected to the mold installation box (12) located above.

4. The injection molding die for automobile fender according to claim 1, characterized in that: An injection tube (7) is fixedly connected to the upper surface of the mold installation box (12) located above, and the lower end of the injection tube (7) penetrates into the interior of the corresponding mold (17); The rear surfaces of the two mold installation boxes (12) are fixedly connected with water outlet pipes (19), and the front ends of the two water outlet pipes (19) respectively penetrate into the interior of the corresponding installation box (16).

5. The injection molding die for automobile fender according to claim 1, characterized in that: The front surfaces of the two mold installation boxes (12) are fixedly connected to water inlet pipes (8), and the rear ends of the two water inlet pipes (8) respectively penetrate into the interior of the corresponding installation box (16). Two vibration motors (14) are fixedly installed on the lower surface of the lower mold installation box (12).

6. The injection molding die for automobile fender according to claim 1, characterized in that: The lower surface of the mold installation box (12) located below is fixedly connected to two L-shaped installation plates (11), and the upper surfaces of the two L-shaped installation plates (11) are fixedly connected to the cylinder installation box (3); The first cylinder (5) is fixedly connected to the interior of each of the four cylinder installation boxes (3).

7. The injection molding die for automobile fender according to claim 6, characterized in that: The telescopic ends of the four first cylinders (5) respectively slide through the upper surface of the corresponding cylinder installation box (3); Among them, two L-shaped plates (6) are fixedly connected to the upper surface of the upper mold installation box (12), and the telescopic ends of the four first cylinders (5) are respectively fixedly connected to the corresponding L-shaped plates (6).

8. The injection molding die for automobile fender according to claim 1, characterized in that: The molding die assembly further comprises a fixing plate (2), the fixing plate (2) being fixedly connected to the upper surfaces of the two mounting bottom boxes (1); Among them, four auxiliary springs (9) are fixedly connected to the upper surface of the fixed plate (2), and the upper ends of the four auxiliary springs (9) are fixedly connected to the mold installation box (12) located below.

9. The injection molding die for automobile fender according to claim 8, characterized in that: Auxiliary telescopic rods (21) are provided inside the four auxiliary springs (9), the lower ends of the four auxiliary telescopic rods (21) are fixedly connected to the fixed plate (2), and the telescopic ends of the four auxiliary telescopic rods (21) are fixedly connected to the mold installation box (12) located below; Two second cylinders (10) are fixedly installed inside the two mounting bottom boxes (1), and the telescopic ends of the four second cylinders (10) slide through the upper surface of the fixed plate (2); The lower surfaces of the two L-shaped mounting plates (11) are both provided with support plates (13), the telescopic ends of the four second cylinders (10) are respectively fixed to the corresponding support plates (13), and the two support plates (13) play a supporting role when the mold is closed.

10. An injection molding process for an automobile guard plate comprises the following steps: S1: Preparation work: when closing the mold, the four second cylinders (10) cooperate with the two support plates (13) to support the two L-shaped mounting plates (11), and further support the mold mounting box (12) located below; in, The two external cooling water pipes are connected to the two water inlet pipes (8) respectively, and the two external drainage pipes are connected to the two water outlet pipes (19) respectively. S2: When closing the mold, the telescopic ends of the four first cylinders (5) are retracted synchronously, pushing the mold installation box (12) located above to move downward. At this time, the four guide rods (4) slide along the inner walls of the corresponding guide holes (15). Through the cooperation between the guide rods (4) and the guide holes (15), the upper mold and the lower mold are ensured to be accurately aligned, avoiding misalignment during closing the mold and causing deviation in the molding size of the guard plate; Meanwhile, the four second cylinders (10) keep the telescopic ends in an extended state, and continuously apply an upward supporting force to the two L-shaped mounting plates (11) through the support plate (13), thereby offsetting the pressure during mold closing and ensuring that the lower mold mounting box (12) remains stable and motionless until the upper mold and the lower mold are completely fitted together and the mold closing is completed. S3: After the mold is closed, the four second cylinders (10) are started to reset; Thereafter, a plurality of heating plates (18) on the lower surface of the mounting box (16) are activated, and the heat generated by the heating plates (18) is transferred to the heating zone through the mold mounting box (12), thereby preheating the upper and lower molds (17) so that the temperature of the molds (17) reaches the melting temperature required by the injection molding material (such as the suitable injection molding temperature of the plastic material). Among them, multiple heat conducting plates (20) evenly conduct heat to all parts of the mold (17), ensuring that the temperature of the inner wall of the mold cavity is consistent, avoiding premature solidification of the injection molding material due to local low temperature, which affects the filling effect; S4: After the mold is preheated, the molten injection material is injected into the cavity formed by the upper mold and the lower mold through the injection tube (7), and the two vibration motors (14) located in the lower mold installation box (12) are started at the same time. The high-frequency vibration generated by the vibration motor (14) is transmitted to the mold cavity through the mold mounting box (12), so that the molten material overcomes the fluidity resistance under the action of the vibration and fully fills the corners, protrusions and other complex structures of the mold cavity, thereby reducing defects such as bubbles and material shortages. At this time, the heat conducting plate (20) assists in the transmission of the vibration energy, so that the material filling is more uniform. S5: After the injection molding is completed, the vibration motor (14) is kept working for a while. After the material is initially distributed inside the cavity, the heating plate (18) is turned off and cooling water is introduced into the cooling area of ​​the installation box (16) through the two water inlet pipes (8); The cooling water circulates in the cooling zone, absorbing the heat of the mold (17) and the material inside the cavity. The heat is discharged with the water flow through the outlet pipe (19). The heat conducting plate (20) accelerates the transfer of heat from the material to the cooling water, so that the material is quickly cooled and shaped. Moreover, due to the uniform heat conduction, the guard plate is prevented from being deformed due to internal stress caused by local excessive cooling. S6: After the material is completely cooled and formed, the vibration motor (14) is turned off, and the telescopic ends of the four first cylinders (5) rise synchronously, driving the upper mold installation box (12) to move upward. S7: After the mold is opened, the molded car guard plate can be taken out from the lower mold, completing the injection molding process.

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