Mold for injection molding of automobile decorating part

Abstract

The mold for injection molding of the automobile decorating part comprises a hot runner system, the hot runner system comprises a hot runner plate, a hot nozzle, a needle valve, a driving mechanism and a heating element, a runner is arranged in the hot runner plate, the hot runner plate is connected with the hot nozzle through the runner in the hot runner plate, the needle valve is arranged in the hot nozzle and controlled by the driving mechanism, and the heating element is arranged in the hot runner plate. The heating elements are uniformly distributed on the hot runner plate and the hot nozzle; the mold body comprises a left mold and a right mold; the hot runner system is arranged above the mold body and is connected with the mold body; and the mold closing system is used for controlling opening and closing of the mold body. According to the mold for injection molding of the automobile decorating part, a needle valve type hot runner system is adopted, material waste can be reduced, the forming efficiency is improved, the yield is improved, a motor is adopted as a power source and a ball screw is adopted for transmission of a mold closing system, the mold closing precision is guaranteed, and the dimensional precision and quality of products are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a mold for injection molding automotive decorative parts. Background Technology

[0002] In the automotive manufacturing industry, the production of automotive trim parts is crucial, as it not only affects the aesthetics of a car but also reflects its quality and class to a certain extent. Currently, injection molding is one of the main methods for producing automotive trim parts.

[0003] Currently, some injection molds for automotive trim parts use cold runner systems. During the injection molding process, the plastic in the runner cools and forms waste material. This waste material cannot be directly reused in production, resulting in significant material waste and increased production costs. Moreover, if the flow of the plastic cannot be precisely controlled, drooling and stringing can easily occur, leading to surface defects and reduced yield.

[0004] In addition, the power source and transmission method used in the mold closing system of some automotive trim injection molds are not stable enough, and the force provided during mold clamping is not precise enough, which can easily lead to incomplete mold closure and affect the dimensional accuracy and quality of the product.

[0005] Therefore, in order to solve the above-mentioned technical problems, it is necessary to develop a mold for injection molding of automotive decorative parts. By adopting a needle valve type hot runner system, cold runner waste can be avoided, material waste can be reduced, plastic flow can be precisely controlled, drooling and stringing can be prevented, and the yield rate can be improved. The mold closing system uses an electric motor as the power source and ball screw transmission to ensure mold closing accuracy. Utility Model Content

[0006] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide an injection mold for automotive decorative parts. The mold has a reasonable structural design and adopts a needle valve hot runner system, which can reduce material waste, improve molding efficiency, and increase yield. The mold closing system uses an electric motor as the power source and a ball screw drive to ensure mold closing accuracy, thus ensuring the dimensional accuracy and quality of the product. It has a wide range of application prospects.

[0007] Technical solution: A mold for injection molding automotive trim parts, comprising:

[0008] A hot runner system includes a hot runner plate, hot nozzles, needle valves, a drive mechanism, and heating elements. The hot runner plate has internal flow channels and is connected to the hot nozzles through the internal flow channels. The hot nozzles are equipped with needle valves, which are controlled by the drive mechanism. The heating elements are evenly distributed on the hot runner plate and the hot nozzles.

[0009] The mold body includes a left mold and a right mold, which are arranged opposite each other and form a cavity when the left mold and the right mold are closed; each of the left mold and the right mold is provided with at least one injection port; the hot runner system is arranged above the mold body, and the hot nozzles are respectively connected to the injection ports of the left mold and the right mold to communicate with the cavity;

[0010] A mold closing system is disposed on one side of the mold body and connected to the mold body, and is used to control the opening and closing of the mold body.

[0011] The injection mold for automotive decorative parts described in this utility model is rationally designed, employing a needle valve-type hot runner system to avoid the generation of waste material in cold runners. In cold runner injection molds, the cooled plastic in the runner becomes waste material, while the hot runner system of this mold keeps the molten plastic in a molten state in the hot runner plate and hot nozzle, allowing it to be directly injected into the cavity for molding, reducing material waste and lowering production costs. During the injection molding process, drooling and stringing can cause defects on the product surface, affecting the product's appearance and performance. The needle valve in the hot nozzle can precisely control the flow of plastic as needed, ensuring that the plastic fills the cavity evenly, reducing product defects and improving the yield. Because the needle valve can precisely control the flow of plastic, the plastic can fill the cavity more quickly and evenly, reducing molding time. Compared to traditional injection molds, this mold can complete the molding of a product in a shorter time, improving production efficiency.

[0012] Furthermore, in the aforementioned injection mold for automotive decorative parts, the driving mechanism is a cylinder or hydraulic cylinder used to control the opening and closing of the needle valve.

[0013] Furthermore, in the aforementioned injection mold for automotive trim parts, the heating element is fixedly wrapped around the outer surface of the hot runner plate and the hot nozzle by high-temperature tape or metal clips and is in close contact with the hot runner plate and the hot nozzle.

[0014] Furthermore, in the aforementioned injection mold for automotive trim parts, the heating element includes a strip heating band and an insulating layer. The strip heating band has insulating layers on both sides, and the strip heating band has terminals at both ends that are connected to an external power source.

[0015] The heating element is flexible, easy to install, and provides uniform heating. The heating strip is flat and its width and length are customized according to the size of the hot runner plate or hot nozzle. Insulation layers are provided on both sides of the heating strip to prevent it from contacting external metal and avoiding short circuits. The terminals of the heating strip are connected to a power source to supply power. During installation, first clean the surface of the hot runner plate or hot nozzle to ensure it is free of oil and impurities. Wrap the heating element around the outer surface of the hot runner plate, ensuring close contact between the heating element and the hot runner plate or hot nozzle. Use high-temperature tape or metal clips to secure the heating element and prevent it from loosening, ensuring a tight contact with the hot runner plate or hot nozzle.

[0016] Furthermore, in the aforementioned injection mold for automotive decorative parts, an outer protective sleeve is provided outside the insulating layer.

[0017] An outer protective sleeve is provided outside the insulation layer to protect the heating strip and the insulation layer from mechanical damage and corrosion.

[0018] Furthermore, in the aforementioned injection mold for automotive decorative parts, the mold clamping system includes a fixed mold plate, a moving mold plate, a front mold plate, a power motor, a tie rod, a ball screw, and a transmission component. The fixed mold plate, the moving mold plate, and the front mold plate are arranged in parallel from left to right. The tie rod passes through the fixed mold plate, the moving mold plate, and the front mold plate from left to right. The power motor is located on the left side of the fixed mold plate and is connected to the left end of the ball screw. The right end of the ball screw passes through the center of the fixed mold plate. The ball nut at the right end of the ball screw drives the crosshead, and the crosshead drives the transmission component. The transmission component is connected to the left side of the moving mold plate. The left side of the left mold plate is fixedly connected to the right side of the moving mold plate, and the right side of the right mold plate is fixedly connected to the left side of the front mold plate.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) The injection mold for automotive decorative parts described in this utility model adopts a needle valve type hot runner system, which avoids the generation of cold runner waste. The needle valve precisely controls the flow of plastic, preventing drooling and stringing, so that the plastic fills the cavity evenly, reducing product defects and improving the yield.

[0021] (2) The mold for injection molding of automotive decorative parts described in this utility model uses a motor as the power source and a ball screw drive in the mold closing system, which can ensure the mold closing accuracy. When the motor is started, the ball screw rotates, the ball nut on the ball screw drives the cross head, and the cross head drives the transmission component, which drives the moving platen to open and close, thereby realizing the opening and closing of the mold body. Since the rotation of the ball screw is powered by the motor, the force provided during mold locking is more precise. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the injection mold for automotive decorative parts according to the present invention;

[0023] Figure 2 This is a schematic diagram of the hot runner of the injection mold for automotive decorative parts according to this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the hot runner of the injection mold for automotive decorative parts according to this utility model;

[0025] Figure 4 This is a schematic diagram of the heating element structure of the injection mold for automotive decorative parts according to the present invention.

[0026] In the diagram: 1. Hot runner system; 11. Hot runner plate; 12. Hot nozzle; 13. Needle valve; 14. Drive mechanism; 15. Heating element; 151. Strip heating belt; 1511. Terminal; 152. Insulation layer; 153. Outer protective sleeve; 2. Mold body; 21. Left mold; 22. Right mold; 3. Mold closing system; 31. Fixed mold plate; 32. Moving mold plate; 33. Front mold plate; 34. Power motor; 35. Tie rod; 36. Ball screw; 361. Cross head; 37. Transmission component. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 , 2 Examples 1, 2, 3, 4, and 2 further illustrate this utility model.

[0028] Example 1

[0029] like Figure 1 , 2 As shown, the injection mold for automotive decorative parts according to this utility model includes a hot runner system 1, a mold body 2, and a mold closing system 3. The hot runner system 1 is located above and connected to the mold body 2. The hot runner system 1 maintains the plastic in a molten state by heating, directly injecting it into the cavity of the mold body 2, reducing waste material after the runner cools. The mold closing system 3 is located on one side of the mold body 2 and connected to the mold body 2, and is used to control the opening and closing of the mold body 2.

[0030] Among them, such as Figure 1 As shown, the mold body 2 includes a left mold 21 and a right mold 22, which are arranged opposite each other and form a cavity when the left mold 21 and the right mold 22 are closed. Both the left mold 21 and the right mold 22 are provided with injection ports.

[0031] Among them, such as Figure 2 , 3As shown, the hot runner system 1 includes a hot runner plate 11, a hot nozzle 12, a needle valve 13, a drive mechanism 14, and a heating element 15. The hot runner plate 11 has internal flow channels, and it connects to the hot nozzle 12 through these channels. Molten plastic flows from the hot runner plate 11 into the hot nozzle 12. The hot nozzle 12 is connected to the injection ports of the left mold 21 and the right mold 22, thus communicating with the mold cavity. The hot nozzle 12 contains a needle valve 13, which precisely controls the plastic flow and prevents drooling and stringing. The needle valve 13 is controlled by the drive mechanism 14 (a pneumatic or hydraulic cylinder) for precise opening and closing. Heating elements 15 are evenly distributed on the hot runner plate 11 and the hot nozzle 12. The temperature is regulated by a temperature control system (thermocouples can be installed on the hot runner plate 11 and the hot nozzle 12 to detect the temperature of the hot runner system. The temperature control system monitors the temperature through the thermocouples, adjusts the power of the heating elements, and maintains a constant temperature).

[0032] Specifically: molten plastic first enters the hot runner plate 11, which has internal flow channels that transport the molten plastic to the hot nozzle 12. Heating elements 15 are evenly distributed on the hot runner plate 11 and the hot nozzle 12 to regulate the temperature and ensure that the molten plastic maintains a suitable temperature and flowability in the hot runner system 1. When plastic needs to be injected, the drive mechanism 14 controls the needle valve 13 to open, and the molten plastic is injected into the cavity from the hot nozzle 12 through the injection ports on the left mold 21 and the right mold 22. After injection molding is completed, the drive mechanism 14 controls the needle valve 13 to close to prevent plastic drooling and stringing.

[0033] The mold-closing system 3 includes a fixed mold plate 31, a moving mold plate 32, a front mold plate 33, a power motor 34, a tie rod 35, a ball screw 36, and a transmission component 37. The fixed mold plate 31, the moving mold plate 32, and the front mold plate 33 are arranged in parallel from left to right. The tie rod 35 passes through the fixed mold plate 31, the moving mold plate 32, and the front mold plate 33 from left to right. The power motor 34 is located on the left side of the fixed mold plate 31 and is connected to the left end of the ball screw 36. The right end of the ball screw 36 passes through the center of the fixed mold plate 31. The ball nut at the right end of the ball screw 36 drives the crosshead 361, which in turn drives the transmission component 37. The transmission component 37 is connected to the left side of the moving mold plate 32. The left side of the left mold 21 is fixedly connected to the right side of the moving mold plate 32, and the right side of the right mold 22 is fixedly connected to the left side of the front mold plate 33.

[0034] Specifically: When mold closing is required, the power motor 34 is started, driving the ball screw 36 to rotate. The ball nut at the right end of the ball screw 36 drives the crosshead 361 to move. The crosshead 361 drives the transmission component 37, which is connected to the left side of the moving template 32, thereby moving the moving template 32 to the right. Since the left side of the left mold 21 is fixedly connected to the right side of the moving template 32, and the right side of the right mold 22 is fixedly connected to the left side of the front template 33, the movement of the moving template 32 causes the left mold 21 and the right mold 22 to close, forming a cavity. When mold opening is required, the power motor 34 reverses, and the ball screw 36 rotates in the opposite direction, driving the moving template 32 to the left, thus separating the left mold 21 and the right mold 22.

[0035] During mold clamping, the motor provides power, enabling more precise control of the clamping force. This avoids the problem of incomplete mold closure caused by unstable power in the mold clamping system 3, thus ensuring the dimensional accuracy and quality of the product.

[0036] Example 2

[0037] Based on the structural foundation of Embodiment 1 and above, such as Figure 1 , 2 As shown in Figures 3 and 4.

[0038] like Figure 4 As shown, in the injection mold for automotive decorative parts of this utility model, the heating element 15 is fixedly wrapped around the outer surface of the hot runner plate 11 and the hot nozzle 12 by high-temperature tape or metal clips and is in close contact with the hot runner plate 11 and the hot nozzle 12.

[0039] Furthermore, the heating element 15 includes a strip heating band 151, an insulating layer 152, and an outer protective sleeve 153. The strip heating band 151 has insulating layers 152 on both sides, and an outer protective sleeve 153 is provided outside the insulating layers 152. The strip heating band 151 has terminals 1511 at both ends and is connected to an external power source.

[0040] The heating element 15 described above has the advantages of good flexibility, convenient installation, and uniform heating. During installation, first clean the surface of the hot runner plate 11 or the hot nozzle 12 to ensure that there is no oil or impurities. Wrap the heating element 15 around the outer surface of the hot runner plate 11 or the hot nozzle 12 to ensure that the heating element 15 is in close contact with the hot runner plate 11 or the hot nozzle 12. Use high-temperature tape or metal clips to fix the heating element 15 to prevent it from loosening and to ensure that it is in close contact with the hot runner plate 11 or the hot nozzle 12.

[0041] The process of using the injection mold for automotive decorative parts according to this utility model is as follows:

[0042] First, the mold clamping system 3 controls the left mold 21 and right mold 22 of the mold body 2 to close and form the cavity. Then, the hot runner system 1 starts working, and molten plastic is injected into the cavity through the hot runner plate 11 and hot nozzle 12. During the injection process, the needle valve 13 precisely controls the flow of plastic. After injection, the plastic is allowed to cool and solidify in the cavity. Then, the mold clamping system 3 controls the mold body 2 to open and remove the molded automotive trim part, completing one production cycle.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A mold for injection molding automotive decorative parts, characterized in that, include: A hot runner system (1) includes a hot runner plate (11), a hot nozzle (12), a needle valve (13), a drive mechanism (14), and a heating element (15). The hot runner plate (11) has a flow channel inside and is connected to the hot nozzle (12) through the internal flow channel. The hot nozzle (12) is equipped with a needle valve (13) inside and is controlled by the drive mechanism (14). The heating element (15) is evenly distributed on the hot runner plate (11) and the hot nozzle (12). The mold body (2) includes a left mold (21) and a right mold (22), which are arranged opposite each other and form a cavity when the left mold (21) and the right mold (22) are closed; each of the left mold (21) and the right mold (22) is provided with at least one injection port; the hot runner system (1) is arranged above the mold body (2), and the hot nozzle (12) is connected to the injection ports of the left mold (21) and the right mold (22) respectively, thereby communicating with the cavity; A mold closing system (3) is provided on one side of the mold body (2) and connected to the mold body (2) for controlling the opening and closing of the mold body (2).

2. The injection mold for automotive decorative parts according to claim 1, characterized in that, The drive mechanism (14) is a cylinder or hydraulic cylinder, used to control the opening and closing of the needle valve (13).

3. The injection mold for automotive decorative parts according to claim 1, characterized in that, The heating element (15) is fixedly wrapped around the outer surface of the hot runner plate (11) and the hot nozzle (12) by high temperature tape or metal clips and is in close contact with the hot runner plate (11) and the hot nozzle (12).

4. The injection mold for automotive decorative parts according to claim 3, characterized in that, The heating element (15) includes a strip heating band (151) and an insulating layer (152). The strip heating band (151) has an insulating layer (152) on both sides and a wiring terminal (1511) at both ends and is connected to an external power source.

5. The injection mold for automotive decorative parts according to claim 4, characterized in that, An outer protective sleeve (153) is provided on the outside of the insulating layer (152).

6. The injection mold for automotive decorative parts according to claim 1, characterized in that, The mold-closing system (3) includes a fixed mold plate (31), a moving mold plate (32), a front mold plate (33), a power motor (34), a tie rod (35), a ball screw (36), and a transmission component (37); the fixed mold plate (31), the moving mold plate (32), and the front mold plate (33) are arranged in parallel from left to right, and the tie rod (35) passes through the fixed mold plate (31), the moving mold plate (32), and the front mold plate (33) from left to right; the power motor (34) is located on the fixed mold plate (31). The left side is connected to the left end of the ball screw (36), the right end of the ball screw (36) passes through the center of the set template (31), the ball nut at the right end of the ball screw (36) drives the cross head (361), the cross head (361) drives the transmission component (37), the transmission component (37) is connected to the left side of the moving template (32), the left side of the left mold (21) is fixedly connected to the right side of the moving template (32), and the right side of the right mold (22) is fixedly connected to the left side of the front template (33).

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