Lightweight thin-wall automobile door panel assembly precision injection mold

Abstract

The utility model provides a kind of lightweight thin wall automobile door panel assembly precision injection mold, it is related to automobile manufacturing technical field, including fixed plate, the outer wall of fixed plate is equipped with ejection assembly, the ejection assembly includes rectangular plate.The utility model, through setting ejection assembly and rotating plate collaborative promotion demolding efficiency, long rod in ejection assembly, first elastic member and sliding ring cooperation top plate, combined with 0-90 ° rotatable and with anti -skid line rotating plate auxiliary ejection, when demolding, through mechanical linkage, the ejection effect of sample body is enhanced, reduce sample damage risk, improve demolding success rate.Gripping assembly guarantees material conveying stability, its arc plate, cylinder and second elastic member constitute self-adapting clamping structure, gripping plate is tightly attached to the outer wall of conveying pipe by elastic force, prevent material from shaking, deviating or leaking when conveying, ensure material supply stability, avoid affecting injection quality, improve production safety and environmental protection simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and in particular to a precision injection mold for a lightweight thin-walled automobile door panel assembly. Background Technology

[0002] In the automotive manufacturing sector, with increasingly stringent regulations on energy conservation, emission reduction, and fuel economy, lightweighting has become an important development direction for the industry. As a key lightweight component, thin-walled automotive door panels place higher demands on the precision, efficiency, and reliability of injection molds during their production.

[0003] Traditional injection molds suffer from problems such as difficult demolding and unstable material delivery. On the one hand, when demolding thin-walled parts, due to their fragile structure, ordinary ejection mechanisms can easily cause deformation and damage to the parts, resulting in low demolding efficiency and high scrap rate. On the other hand, the shaking, displacement, or leakage of material in the delivery pipeline during the injection molding process not only affects the precision and quality of injection molding but may also cause material waste, posing safety hazards and environmental pollution risks. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problems mentioned in the background section.

[0005] The present invention adopts the following technical solution: a lightweight thin-walled automotive door panel assembly precision injection mold, including a fixed plate, an ejection assembly provided on the outer wall of the fixed plate, the ejection assembly including a rectangular plate, a long rod fixedly installed on the inner wall of the rectangular plate, a first elastic element sleeved on the outer wall of the long rod, a slip ring slidably connected to the outer wall of the long rod, and a top plate fixedly installed on the side of the long rod away from the slip ring.

[0006] Preferably, a motor is fixedly installed on the inner wall of the fixed plate, and a lead screw is fixedly installed on the output end of the motor. An upper mold and a lower mold are respectively provided on the outer wall of the lead screw. The sample body is movably connected to the inner wall of the lower mold. A round shaft is fixedly installed on the inner wall of the lower mold, and a rotating plate is rotatably connected to the outer wall of the round shaft. A controller is fixedly installed on one side of the fixed plate, and a material ejector is provided on the other side of the fixed plate. A conveying pipe is provided on the outer wall of the side of the fixed plate away from the controller, and a clamping assembly is provided on the outer wall of the conveying pipe. Here, the motor installed on the inner wall of the fixed plate drives the lead screw, enabling the upper and lower molds to achieve precise opening and closing actions, ensuring the smooth progress of the injection molding process. The round shaft and rotating plate in the lower mold cooperate with the ejection assembly to further improve the ejection effect of the sample body. The controller is electrically connected to the motor and the material ejector, realizing automated control of mold operation and material conveying, improving production efficiency and process accuracy; the conveying pipe and clamping assembly are also included.

[0007] Preferably, the outer wall of the rectangular plate is fixedly installed on the outer wall of the fixed plate, the long rod is parallel to the position of the rotating plate, one side of the first elastic element is in contact with the bottom of the top plate, and the other side of the first elastic element is fixedly installed on the top of the slip ring. Here, the installation relationship between the rectangular plate and the fixed plate, as well as the positional and connection relationships between the long rod, the first elastic element, the slip ring, and the top plate, are clearly defined, enabling the ejection assembly to be accurately positioned and operate stably within the mold structure.

[0008] Preferably, the outer wall of the lead screw is provided with two sets of sliders. One set of sliders is fixedly installed on the outer wall of the upper mold, and the other set of sliders is rotatably connected to the outer wall of the lead screw and fixedly installed on the inner wall of the fixed plate. The outer wall of the lower mold is fixedly installed with the other set of sliders, and the other set of sliders is threadedly connected to the outer wall of the lead screw and slidably connected to the inner wall of the fixed plate. One side of the conveying pipe is connected to the top of the discharge device, and the other side of the conveying pipe is connected to the inner walls of the upper and lower molds. The controller is electrically connected to the motor and the discharge device. This section details the connection method between the lead screw and the upper and lower molds, ensuring that the upper and lower molds can open and close according to a predetermined trajectory under the drive of the lead screw, thus improving the accuracy and stability of mold opening and closing.

[0009] Preferably, the clamping assembly includes an arc-shaped plate, with a cylinder slidably connected to the inner wall of the arc-shaped plate. A second elastic element is sleeved on the outer wall of the cylinder. A limit plate is fixedly installed on one side of the cylinder, and a clamping plate is fixedly installed on the other side of the cylinder. Here, the arc-shaped plate, cylinder, second elastic element, limit plate, and clamping plate in the clamping assembly cooperate with each other to stably clamp the material during material conveying, preventing the material from shaking or shifting within the conveying pipe, thus ensuring the stability and accuracy of material conveying.

[0010] Preferably, the outer wall of the arc-shaped plate is fixedly installed with the outer wall of the fixed plate, one side of the second elastic element is fixedly installed with the outer wall of the cylinder, and the other side of the second elastic element is fixedly installed with the inner wall of the arc-shaped plate. The outer wall of the clamping plate is in contact with the outer wall of the conveying pipe. Here, the installation relationship between the arc-shaped plate and the fixed plate, as well as the connection relationship between the second elastic element, the cylinder, and the clamping plate, enable the clamping assembly to be stably installed on the conveying pipe. Furthermore, the second elastic element can adaptively clamp the material according to its characteristics and conveying requirements, ensuring the stability and reliability of the clamping effect.

[0011] Preferably, the rotating plate has anti-slip texture on the side near the sample body. The rotation angle range of the rotating plate is 0-90°, and when the rotating plate rotates to be perpendicular to the inner wall of the lower mold, the end of the rotating plate away from the circular axis contacts the bottom of the top plate. Through the cooperation of the rotating plate and the top plate, the sample body is assisted in being ejected. Here, the anti-slip texture on the rotating plate increases the friction between it and the sample body, preventing the sample body from slipping during the assisted ejection process and ensuring the ejection effect.

[0012] Preferably, the inner wall of the conveying pipe is equipped with a temperature sensor, which is electrically connected to a controller. The controller controls the discharge speed and temperature of the ejector based on the temperature data fed back by the temperature sensor. The mating surfaces of the upper and lower molds are equipped with mating locating pins and locating holes. The outer diameter of the locating pin and the inner diameter of the locating hole are clearance-fitted with a tolerance range of ±0.02mm. The mating of the locating pin and the locating hole ensures the accuracy of the upper and lower molds during mold closing. Here, the temperature sensor on the inner wall of the conveying pipe, in conjunction with the controller, can monitor the material temperature in real time and accurately control the discharge speed and temperature of the ejector based on the temperature data, ensuring the temperature stability of the material during injection molding, thereby improving the quality of injection molding and the consistency of the product.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, the demolding efficiency is improved by setting an ejector assembly and a rotating plate in synergy. The long rod, the first elastic element, and the slip ring in the ejector assembly cooperate with the top plate, combined with the rotating plate which can rotate 0-90° and has anti-slip texture to assist in ejection. During demolding, the mechanical linkage enhances the ejection effect on the sample body, reduces the risk of sample damage, and improves the demolding success rate. The clamping assembly ensures the stability of material conveying. Its arc plate, cylinder, and second elastic element form an adaptive clamping structure. The elastic force keeps the clamping plate tightly against the outer wall of the conveying pipe, preventing the material from shaking, shifting, or leaking during conveying, ensuring a stable material supply, avoiding affecting the injection molding quality, and improving production safety and environmental protection.

[0015] 2. In this utility model, precise mold opening and closing are achieved by setting up a motor and lead screw drive. The controller is electrically connected to the motor, which drives the lead screw to move the upper and lower molds along a predetermined trajectory. The use of locating pins and locating holes with extremely small tolerances avoids mold closing deviations that could lead to product dimensional errors or flash, ensuring a stable injection molding process. Real-time temperature monitoring and intelligent material discharge adjustment are also included. Temperature sensors inside the conveying pipe provide real-time feedback on the material temperature, and the controller dynamically adjusts the discharge speed and temperature of the ejector accordingly, ensuring stable material temperature during injection molding, improving molding quality and product consistency, reducing manual intervention, achieving automated production, and increasing production efficiency and product precision. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of a precision injection mold for a lightweight thin-walled automotive door panel assembly is provided for this utility model.

[0017] Figure 2 This utility model provides a schematic diagram of the other side of a precision injection mold for a lightweight thin-walled automotive door panel assembly.

[0018] Figure 3 A cross-sectional structural diagram of a precision injection mold for a lightweight thin-walled automotive door panel assembly is provided for this utility model.

[0019] Figure 4 This utility model provides a schematic diagram of the clamping component structure for a lightweight thin-walled automotive door panel assembly precision injection mold;

[0020] Figure 5 This utility model provides a schematic diagram of a circular shaft structure for a precision injection mold of a lightweight thin-walled automotive door panel assembly;

[0021] Figure 6 This utility model presents a schematic diagram of the ejection assembly structure of a precision injection mold for a lightweight thin-walled automotive door panel assembly.

[0022] Legend:

[0023] 1. Fixed plate; 2. Motor; 3. Lead screw; 4. Upper mold; 5. Lower mold; 6. Sample body; 7. Round shaft; 8. Rotating plate; 9. Ejection assembly; 10. Controller; 11. Discharge device; 12. Conveying pipe; 13. Clamping assembly;

[0024] 901. Rectangular plate; 902. Long rod; 903. First elastic element; 904. Slip ring; 905. Top plate;

[0025] 1301, Arc-shaped plate; 1302, Cylinder; 1303, Second elastic element; 1304, Limiting plate; 1305, Clamping plate. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0028] Example 1

[0029] Please see Figures 1-6 This utility model provides a technical solution: a lightweight thin-walled automotive door panel assembly precision injection mold, including a fixed plate 1, an ejector assembly 9 on the outer wall of the fixed plate 1, the ejector assembly 9 including a rectangular plate 901, a long rod 902 fixedly installed on the inner wall of the rectangular plate 901, a first elastic element 903 sleeved on the outer wall of the long rod 902, a slip ring 904 slidably connected to the outer wall of the long rod 902, and a top plate 905 fixedly installed on the side of the long rod 902 away from the slip ring 904.

[0030] A motor 2 is fixedly installed on the inner wall of the fixed plate 1. A lead screw 3 is fixedly installed at the output end of the motor 2. An upper mold 4 and a lower mold 5 are respectively provided on the outer wall of the lead screw 3. A sample body 6 is movably connected to the inner wall of the lower mold 5. A round shaft 7 is fixedly installed on the inner wall of the lower mold 5. A rotating plate 8 is rotatably connected to the outer wall of the round shaft 7. A controller 10 is fixedly installed on one side of the fixed plate 1. A material ejector 11 is provided on the other side of the fixed plate 1. A conveying pipe 12 is provided on the outer wall of the side of the fixed plate 1 away from the controller 10. A clamping assembly 13 is provided on the outer wall of the conveying pipe 12. Here, the motor 2 installed on the inner wall of the fixed plate 1 drives the lead screw 3, so that the upper mold 4 and the lower mold 5 can achieve precise mold opening and closing actions, ensuring the smooth progress of the injection molding process. The round shaft 7 and the rotating plate 8 provided in the lower mold 5 cooperate with the ejection assembly 9 to further improve the ejection effect of the sample body 6. The controller 10 is electrically connected to the motor 2 and the feeder 11, realizing automated control of mold operation and material conveying, improving production efficiency and the accuracy of the production process; the setting of the conveying pipe 12 and the clamping assembly 13 ensures the stability and sealing of the material during the conveying process, providing a reliable material supply for injection molding.

[0031] The outer wall of the rectangular plate 901 is fixedly installed on the outer wall of the fixed plate 1. The long rod 902 is parallel to the position of the rotating plate 8. One side of the first elastic element 903 is in contact with the bottom of the top plate 905, and the other side of the first elastic element 903 is fixedly installed on the top of the slip ring 904. Here, the installation relationship between the rectangular plate 901 and the fixed plate 1, as well as the position and connection relationship between the long rod 902, the first elastic element 903, the slip ring 904, and the top plate 905, are clearly defined. This ensures that the ejector assembly 9 can be accurately positioned and operate stably in the mold structure, guaranteeing the continuity and effectiveness of the ejection action of the ejector assembly 9. It also ensures that the ejector assembly 9 will not malfunction due to installation problems during mold operation, thereby improving the overall reliability of the mold.

[0032] The outer wall of the lead screw 3 is equipped with two sets of sliders. One set of sliders is fixedly installed on the outer wall of the upper mold 4, and the other set of sliders is rotatably connected to the outer wall of the lead screw 3 and fixedly installed on the inner wall of the fixing plate 1. The outer wall of the lower mold 5 is fixedly installed with another set of sliders, and the other set of sliders is threadedly connected to the outer wall of the lead screw 3 and slidably connected to the inner wall of the fixing plate 1. One side of the conveying pipe 12 is connected to the top of the discharge device 11, and the other side of the conveying pipe 12 is connected to the inner walls of the upper mold 4 and the lower mold 5. The controller 10 is electrically connected to the motor 2 and the discharge device 11. Here, the connection method between the lead screw 3 and the upper mold 4 and the lower mold 5 is described in detail, ensuring that the upper mold 4 and the lower mold 5 can open and close according to a predetermined trajectory under the drive of the lead screw 3, thereby improving the accuracy and stability of mold opening and closing. The connection between the conveying pipe 12 and the discharge device 11, the upper mold 4 and the lower mold 5, as well as the control relationship between the controller 10 and the motor 2 and the discharge device 11, ensure that the material can be accurately and timely conveyed into the mold, realize automated production, reduce manual intervention, and improve production efficiency and product quality consistency.

[0033] The clamping assembly 13 includes an arc-shaped plate 1301, with a cylinder 1302 slidably connected to the inner wall of the arc-shaped plate 1301. A second elastic element 1303 is sleeved on the outer wall of the cylinder 1302. A limit plate 1304 is fixedly installed on one side of the cylinder 1302, and a clamping plate 1305 is fixedly installed on the other side of the cylinder 1302. Here, the arc-shaped plate 1301, cylinder 1302, second elastic element 1303, limit plate 1304, and clamping plate 1305 in the clamping assembly 13 cooperate with each other to stably clamp the material during material conveying, preventing the material from shaking or shifting within the conveying pipe 12. This ensures the stability and accuracy of material conveying, avoids affecting the quality of injection molding due to material conveying problems, and improves the practicality of the mold and the reliability of the production process.

[0034] The outer wall of the arc-shaped plate 1301 is fixedly installed on the outer wall of the fixed plate 1. One side of the second elastic element 1303 is fixedly installed on the outer wall of the cylinder 1302, and the other side of the second elastic element 1303 is fixedly installed on the inner wall of the arc-shaped plate 1301. The outer wall of the clamping plate 1305 is in contact with the outer wall of the conveying pipe 12. Here, the installation relationship between the arc-shaped plate 1301 and the fixed plate 1, as well as the connection relationship between the second elastic element 1303, the cylinder 1302, and the clamping plate 1305, enable the clamping assembly 13 to be stably installed on the conveying pipe 12. Furthermore, it can adaptively clamp the material according to the characteristics of the material and the conveying requirements through the second elastic element 1303, ensuring the stability and reliability of the clamping effect. This ensures that the material will not leak or spill during the conveying process, improving the safety and environmental protection of the production process.

[0035] The rotating plate 8 has anti-slip textures on the side near the sample body 6. The rotation angle range of the rotating plate 8 is 0-90°. When the rotating plate 8 rotates to be perpendicular to the inner wall of the lower mold 5, the end of the rotating plate 8 away from the circular shaft 7 contacts the bottom of the top plate 905. Through the cooperation between the rotating plate 8 and the top plate 905, the sample body 6 is assisted in being ejected. Here, the anti-slip textures on the rotating plate 8 increase the friction between it and the sample body 6, preventing the sample body 6 from slipping during the assisted ejection process and ensuring the ejection effect. The rotation angle range of the rotating plate 8 and its cooperation with the top plate 905 allow the rotating plate 8 to assist in ejecting the sample body 6 at the appropriate time, further improving the ejection efficiency and success rate of the sample body 6, reducing the risk of sample damage during ejection, and improving product quality and production efficiency.

[0036] A temperature sensor is installed on the inner wall of the conveying pipe 12. The temperature sensor is electrically connected to the controller 10. The controller 10 controls the discharge speed and temperature of the ejector 11 based on the temperature data fed back by the temperature sensor. The mold closing surfaces of the upper mold 4 and the lower mold 5 are equipped with mutually cooperating locating pins and locating holes. The outer diameter of the locating pin and the inner diameter of the locating hole are fitted with a clearance fit, with a tolerance range of ±0.02mm. The fit between the locating pin and the locating hole ensures the accuracy of the mold closing of the upper mold 4 and the lower mold 5. Here, the temperature sensor on the inner wall of the conveying pipe 12, in conjunction with the controller 10, can monitor the material temperature in real time and accurately control the discharge speed and temperature of the ejector 11 based on the temperature data, ensuring the temperature stability of the material during the injection molding process, thereby improving the quality of injection molding and the consistency of the product. The fit between the locating pin and the locating hole on the mold closing surfaces of the upper mold 4 and the lower mold 5, with a very small tolerance range, ensures the mold closing accuracy, avoiding problems such as product size deviation and flash caused by inaccurate mold closing, improving the accuracy and quality of the product, and enhancing the applicability of the mold and the reliability of production.

[0037] Working principle: Before material conveying, the operator pulls the limiting plate 1304, causing the cylindrical column 1302, which is rigidly connected to it, to slide outward along the inner wall of the arc-shaped plate 1301. At this time, the second elastic element 1303 (compression spring) sleeved on the outside of the cylindrical column 1302 is compressed between the inner wall of the arc-shaped plate 1301 and the limiting plate 1304. After the conveying pipe 12 is placed in the groove of the arc-shaped plate 1301, the operator releases the limiting plate 1304. The spring force pushes the cylindrical column 1302 to slide in the opposite direction, so that the clamping plate 1305 at the end fits tightly against the outer wall of the conveying pipe 12. At this time, the spring force is converted into the positive pressure of the clamping plate 1305 on the conveying pipe 12. The friction generated by the contact surface of the two is sufficient to resist the impact force during the material conveying process, ensuring that the conveying pipe 12 is stably fixed. At this time, the controller 10 instructs the motor 2 to drive the lead screw 3 to rotate forward, causing the lower mold 5 to slide upward along the inner wall of the fixed plate 1 and close with the upper mold 4. The positioning pin is accurately inserted into the positioning hole to ensure the mold closing accuracy. The ejector 11 heats and melts the plastic raw material. The temperature sensor on the inner wall of the conveying pipe 12 monitors the material temperature in real time and feeds it back to the controller 10, dynamically adjusting the heating power and ejection speed of the ejector 11. The molten material is injected into the inner cavity of the upper mold 4 and the lower mold 5 through the conveying pipe 12. The controller 10 precisely controls the injection pressure and time. The material cools and forms the car door panel sample body 6 in the cavity. Then comes the demolding stage. The controller 10 instructs the motor 2 to reverse so that the lower mold 5 moves down to open the mold, and the sample body 6 remains in the lower mold 5. At this time, during the demolding stage, when the top plate 905 moves upward and contacts the rotating plate 8 and continues to rise, the rotating plate 8 is pushed by it and rotates around the circular axis 7 (rotation angle range 0-90°). At the same time, the first elastic element 903 is compressed at the bottom of the lower mold 5. During this process, the first elastic element 903 effectively buffers the impact force between the top plate 905 and the rotating plate 8, preventing excessive ejection force from damaging the sample body 6 and ensuring smooth ejection. After the sample body 6 is ejected, the first elastic element 903 returns to its original state, driving the top plate 905 to reset downwards, so that the ejection assembly 9 returns to its initial position, preparing for the next ejection operation and ensuring that the mold ejection action is continuous and efficient.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A precision injection mold for a lightweight thin-walled automotive door panel assembly, comprising a fixing plate (1), characterized in that: The outer wall of the fixed plate (1) is provided with an ejector assembly (9), the ejector assembly (9) includes a rectangular plate (901), a long rod (902) is fixedly installed on the inner wall of the rectangular plate (901), a first elastic element (903) is sleeved on the outer wall of the long rod (902), a slip ring (904) is slidably connected to the outer wall of the long rod (902), and a top plate (905) is fixedly installed on the side of the long rod (902) away from the slip ring (904).

2. The precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 1, characterized in that: A motor (2) is fixedly installed on the inner wall of the fixed plate (1). A lead screw (3) is fixedly installed at the output end of the motor (2). An upper mold (4) and a lower mold (5) are respectively provided on the outer wall of the lead screw (3). A sample body (6) is movably connected to the inner wall of the lower mold (5). A round shaft (7) is fixedly installed on the inner wall of the lower mold (5). A rotating plate (8) is rotatably connected to the outer wall of the round shaft (7). A controller (10) is fixedly installed on one side of the fixed plate (1). A discharge device (11) is provided on the other side of the fixed plate (1). A conveying pipe (12) is provided on the outer wall of the side of the fixed plate (1) away from the controller (10). A clamping assembly (13) is provided on the outer wall of the conveying pipe (12).

3. The precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 1, characterized in that: The outer wall of the rectangular plate (901) is fixedly installed on the outer wall of the fixed plate (1), the long rod (902) is parallel to the position of the rotating plate (8), one side of the first elastic member (903) is in contact with the bottom of the top plate (905), and the other side of the first elastic member (903) is fixedly installed on the top of the slip ring (904).

4. The precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 2, characterized in that: The outer wall of the lead screw (3) is provided with two sets of sliders. One set of sliders is fixedly installed on the outer wall of the upper mold (4), and the other set of sliders is rotatably connected to the outer wall of the lead screw (3) and fixedly installed on the inner wall of the fixing plate (1). The outer wall of the lower mold (5) is fixedly installed with another set of sliders. The other set of sliders is threadedly connected to the outer wall of the lead screw (3) and slidably connected to the inner wall of the fixing plate (1). One side of the conveying pipe (12) is connected to the top of the discharge device (11), and the other side of the conveying pipe (12) is connected to the inner walls of the upper mold (4) and the lower mold (5). The controller (10) is electrically connected to the motor (2) and the discharge device (11).

5. A precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 2, characterized in that: The clamping assembly (13) includes an arc-shaped plate (1301), a cylinder (1302) is slidably connected to the inner wall of the arc-shaped plate (1301), a second elastic element (1303) is sleeved on the outer wall of the cylinder (1302), a limit plate (1304) is fixedly installed on one side of the cylinder (1302), and a clamping plate (1305) is fixedly installed on the other side of the cylinder (1302).

6. A precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 5, characterized in that: The outer wall of the arc plate (1301) is fixedly installed with the outer wall of the fixing plate (1), one side of the second elastic member (1303) is fixedly installed with the outer wall of the cylinder (1302), the other side of the second elastic member (1303) is fixedly installed with the inner wall of the arc plate (1301), and the outer wall of the clamping plate (1305) is in contact with the outer wall of the conveying pipe (12).

7. A precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 6, characterized in that: The rotating plate (8) has anti-slip texture on the side near the sample body (6). The rotation angle range of the rotating plate (8) is 0-90°. When the rotating plate (8) rotates to be perpendicular to the inner wall of the lower mold (5), the end of the rotating plate (8) away from the circular shaft (7) contacts the bottom of the top plate (905). Through the cooperation of the rotating plate (8) and the top plate (905), the sample body (6) is assisted in being ejected.

8. A precision injection mold for a lightweight thin-walled automotive door panel assembly according to claim 2, characterized in that: The inner wall of the conveying pipe (12) is provided with a temperature sensor, which is electrically connected to the controller (10). The controller (10) controls the discharge speed and temperature of the discharge device (11) based on the temperature data fed back by the temperature sensor. The mold closing surfaces of the upper mold (4) and the lower mold (5) are provided with mutually cooperating positioning pins and positioning holes. The outer diameter of the positioning pin is clearance-fitted with the inner diameter of the positioning hole, with a tolerance range of ±0.02mm. The cooperation between the positioning pin and the positioning hole ensures the accuracy of the upper mold (4) and the lower mold (5) when they are closed.

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