A thin-walled part forming mold and forming method

Abstract

This application discloses a thin-walled part molding die, including a fixed mold plate, a movable mold plate, and a support plate. The fixed mold plate has a feed port and a fixed mold core, and the movable mold plate has a movable mold core and a die core. The fixed mold core, movable mold core, and die core form a cavity. The die core can move within the movable mold plate by the movement of the support plate, adjusting the thickness of the part within the cavity. The movable mold plate and the support plate are fixedly connected by one or more elastic mechanisms, and the elastic mechanisms can form a fixed gap between the movable mold plate and the support plate. During injection molding, the support plate squeezes the elastic mechanisms, making the fixed gap zero, thereby driving the die core to compress the cavity volume to obtain a thin-walled part. The cavity includes the part and an overflow groove. The overflow groove is located at the edge of the part, and the volume of the overflow groove is larger than the volume of the part, so that the overflow groove is not filled with molten material during injection molding. This application has a simple mold structure and low cost for molding thin-walled parts.

Description

Technical Field

[0001] This application belongs to the field of plastic part molding, specifically relating to a thin-walled part molding die and molding method. Background Technology

[0002] As the market develops, plastic processing companies need to expand into overseas markets. Many materials need to meet the US UL testing standards, and many industries have high requirements for thin-walled parts, which are difficult to mold. For example, in the connector industry, the thinnest thickness requirement is 0.3mm. Currently, thin-walled parts are usually molded using injection molding machines with injection speeds up to 1500 rpm, using high-speed, high-mold-temperature molding. This method requires special injection molding machines, and the high-temperature, high-pressure molding consumes a lot of energy, resulting in extremely high costs. Summary of the Invention

[0003] To overcome the problems of complex, difficult, and costly thin-walled part molds in the prior art, the purpose of this application is to provide a molding die and molding method with simple structure and low molding cost for thin-walled parts, which is achieved through the following technical solution:

[0004] A thin-walled part forming mold includes a fixed mold plate, a movable mold plate, and a support plate. The fixed mold plate is provided with a feed port and a fixed mold core. The movable mold plate is provided with a movable mold core and a core. The fixed mold core, the movable mold core, and the core form a cavity. The core can move within the movable mold plate by the movement of the support plate relative to the movable mold plate, thereby adjusting the thickness of the part in the cavity.

[0005] The moving template and the support plate are fixedly connected by one or more elastic mechanisms, and the elastic mechanisms can form a fixed gap between the moving template and the support plate. During the injection molding process, the support plate squeezes the elastic mechanism to make the fixed gap zero, thereby driving the core to compress the cavity volume and obtain a thin-walled part.

[0006] The cavity includes a part and an overflow channel. The overflow channel is located at the edge of the part and its volume is greater than that of the part, so that the overflow channel is not filled with material during the injection molding process.

[0007] Optionally, the overflow trough is located at the end of the part.

[0008] Optionally, the overflow groove is positioned perpendicular to the direction of the part at its connection with the part.

[0009] Optionally, the fixed gap is 2mm.

[0010] Optionally, the cavity may be multiple.

[0011] Optionally, the size of the fixed gap can be adjusted by a spring mechanism.

[0012] Optionally, the elastic mechanism is disposed in the countersunk hole of the support plate and / or the moving template. The elastic mechanism includes an elastic unit, a sleeve and a screw. The screw passes through the support plate and is fixedly connected to the moving template. The sleeve is disposed outside the screw, and the elastic unit is disposed outside the sleeve.

[0013] Optionally, the elastic unit is a spring, with the sleeve and spring connected in series by a screw and fixed to the moving template.

[0014] Optionally, one end of the spring rests on the moving template and the other end rests on the support plate, and the spring is in a compressed state.

[0015] Optionally, the sleeve is provided with a step, which is located in the mounting countersunk hole on the support plate. An assembly gap is formed between the mounting countersunk hole and the step. The assembly gap is equal to the fixed gap. The size of the fixed gap between the support plate and the moving template can be precisely adjusted by adjusting the screws.

[0016] Optionally, the core and the support plate are detachably connected.

[0017] Optionally, a mold-locking mechanism is also included, which includes a fixed base and a locking screw. The fixed base is fixed on the support plate or the fixed template, and one end of the corresponding locking screw is fixed in the connecting hole on the fixed template or the support plate, while the other end cooperates with the fixed base to lock the support plate and the fixed template.

[0018] Optionally, the mounting base is provided with a U-shaped through hole, and the locking screw is inserted into the mounting base through the opening of the U-shaped through hole; the connecting hole is provided with an internal thread and is used in conjunction with the locking screw.

[0019] Optionally, the U-shaped through hole is provided with a receiving cavity for accommodating the head structure of the locking screw.

[0020] Optionally, it also includes an air blowing mechanism, which is fixed on the moving template and blows air at a certain position on the surface of the mold cavity during demolding to assist in the demolding of the thin sheet part; the air blowing mechanism can be rotated and adjusted.

[0021] Optionally, it also includes a flow channel turning mechanism, which includes a main flow channel, a turning valve, and multiple branch flow channels arranged in sequence. The main flow channel is selectively connected to the multiple branch flow channels through the turning valve.

[0022] This application also provides a molding method according to any of the foregoing molding die technical solutions, comprising the following steps:

[0023] Mold opening: After the mold is loaded into the injection molding machine, the mold is opened, and the elastic mechanism will create a fixed gap between the support plate and the moving platen.

[0024] Injection: The moving template and the support plate maintain a fixed gap, and the plastic melt enters the cavity; because the molding cavity is thicker at this time, the cross-sectional area of ​​the plastic flow is large, the injection pressure is small, and it is easy to mold.

[0025] Compression: When the amount of melt entering the cavity meets the preset volume, the control plate moves towards the moving template, and the support plate drives the core to move, compressing the cavity volume until the fixed gap is 0;

[0026] Thin-walled parts are obtained through pressure holding, cooling, demolding, and post-processing.

[0027] Optionally, post-processing may include removing the plastic structure formed in the overflow tank.

[0028] Optionally, before mold opening, the steps include adjusting the fixed gap between the support plate and the moving mold plate to 0 using a mold clamping mechanism;

[0029] The mold opening process includes opening the mold locking mechanism and adjusting the fixed gap between the support plate and the moving mold plate to a preset value under the action of the elastic mechanism.

[0030] Compared with existing technologies, this application controls the formation of a fixed gap between the support plate and the moving mold plate through an elastic mechanism. During the molding process, the support plate pushes the core to change the thickness of the part inside the cavity, resulting in a thin-walled part. The structure is simple, and the molding cost is low. By setting a fixed gap, the cross-sectional area of ​​the plastic melt flow is increased. On the one hand, the injection pressure is lower, making it easier to mold and avoiding the use of expensive high-speed, high-temperature injection molding machines; on the other hand, it solves the problem of the melt not being able to fill the mold during the molding of thin-walled parts. By placing the overflow groove at the edge of the part, and the volume of the overflow groove being larger than the volume of the part, the overflow groove is not completely filled with material during injection molding. This ensures that the melt flows relatively freely during compression, and the internal fibers do not become oriented due to pressure during flow. This reduces the problem of uneven and unstable performance caused by different fiber orientations at different directions and positions in the part, improves product performance, and ensures stable and accurate test results during part testing. Attached Figure Description

[0031] Figure 1 This is a perspective view of the injection mold described in the embodiment;

[0032] Figure 2 This is a partial structural disassembly diagram of the injection mold described in the embodiment;

[0033] Figure 3 This is a schematic diagram of the moving template structure of the injection mold described in the embodiment;

[0034] Figure 4 This is a perspective view of the elastic mechanism of the injection mold described in the embodiment;

[0035] Figure 5 This is a cross-sectional view of the elastic mechanism of the injection mold described in the embodiment;

[0036] Figure 6 This is a schematic diagram of the runner structure of the injection mold described in the embodiment;

[0037] Figure 7 This is a perspective view of the steering valve of the injection mold described in the embodiment;

[0038] Figure 8 This is a perspective view of the clamping mechanism of the injection mold described in the embodiment;

[0039] Figure 9 This is a schematic diagram of the structure of the clamping mechanism fixing seat of the injection mold described in the embodiment;

[0040] Figure 10 This is a perspective view of the air blowing mechanism of the injection mold described in the embodiment.

[0041] In the figure, the reference numerals are as follows: 1 Fixed mold plate, 101 Fixed mold core, 102 Inlet, 103 Connecting hole, 2 Moving mold plate, 201 Moving mold core, 202 Core, 203 Cavity, 204 Part, 205 Overflow groove, 3 Support plate, 301 Mounting countersunk hole, 302 Push rod, 4 Push plate, 5 Base plate, 6 Elastic mechanism, 601 Screw, 602 Sleeve, 6021 Step, 6022 Assembly clearance, 603 Elastic unit, 7 Mold locking mechanism, 701 Fixed seat, 702 Locking screw, 703 U-shaped through hole, 704 Receiving cavity, 8 Air blowing mechanism, 801 Air inlet, 802 Air outlet, 803 Rotating structure, 9 Fixed clearance, 10 Flow channel turning mechanism, 1001 Main flow channel, 1002 Turning valve, 1003 Branch flow channel. Detailed Implementation

[0042] The specific implementation of this application is described in detail below through examples. However, the specific implementation of this application is not intended to limit the technical solution of this application. Any non-substantial changes, such as replacing common technical solutions in the field, using the technical solutions described in the embodiments of this application are within the protection scope of this application. Example 1

[0043] like Figures 1-6 The thin-walled part forming mold shown includes a fixed template 1, a movable template 2, a support plate 3, and a base plate 5. The fixed template 1 is provided with a feed port 102 and a fixed mold core 101. The movable template 2 is provided with a movable mold core 201 and a core 202. The fixed mold core 101, the movable mold core 201, and the core 202 form a cavity 203. The core 202 can move within the movable template 2 by moving the support plate 3 relative to the movable template, thereby adjusting the thickness of the part 204 in the cavity 203. In this embodiment, the fixed mold core 101 and the fixed template 1 are an integral structure.

[0044] The moving template 2 and the support plate 3 are fixedly connected by one or more elastic mechanisms 6, and the elastic mechanism 6 can make a fixed gap 9 between the moving template 2 and the support plate 3. During the injection molding process, the support plate 3 squeezes the elastic mechanism, making the fixed gap 9 zero, thereby driving the core 202 to compress the volume of the cavity 203 to obtain a thin-walled part.

[0045] The cavity 203 includes a part 204 and an overflow channel 205. The overflow channel 205 is located at the edge of the part 204, and its volume is larger than that of the part 204, so that the overflow channel 205 is not completely filled with molten material during injection molding. If the overflow channel 205 is filled, the melt inside the cavity 203 will be subjected to a certain degree of stress, leading to fiber orientation, which is detrimental to the uniformity of the performance of the part 204 and makes it difficult to use for UL testing.

[0046] Furthermore, when the volume of the overflow groove is small relative to the part volume, on the one hand, less material is injected to ensure that the overflow groove only overflows and is not completely filled, thus reducing fiber orientation. However, in the injection molding of thin-walled parts, less material usually makes it difficult to fill the overflow groove, especially for parts with long thin walls, where the problem is more serious. On the other hand, it is easy to fill the overflow groove during injection molding. During the holding pressure process, the melt pressure can easily expand the cavity or core, which will also increase the thickness of the part.

[0047] A fixed gap 9 is formed between the support plate 3 and the moving mold plate 2 by the elastic mechanism 6. During the molding process, the support plate 3 pushes the core 202 to change the thickness of the part 204 in the cavity 203, resulting in a thin-walled part 204. The structure is simple and the molding cost is low. By setting the fixed gap 9, the cross-sectional area of ​​the plastic melt flow is increased. On the one hand, the injection pressure is low, making it easier to mold and avoiding the use of expensive high-injection-speed and high-mold-temperature injection molding machines; on the other hand, it solves the problem that the melt is not easy to fill completely during the molding of the thin-walled part 204. By placing the overflow groove 205 at the edge of the part 204, and ensuring that the volume of the overflow groove 205 is greater than the volume of the part 204, the overflow groove 204 is not filled with flowing material during the injection molding process. This ensures that the melt flows relatively freely during compression, and the internal fibers do not become oriented due to pressure during the flow. This reduces the problem of uneven and unstable performance caused by fiber orientation in different directions and positions in the part 204, improves the performance of the product, and ensures that the test results are stable and accurate in the testing of the part 204.

[0048] The work includes the following steps:

[0049] Mold opening: After the mold is loaded into the injection molding machine, the mold is opened, and the elastic mechanism 6 will make a fixed gap 9 between the bearing plate and the moving platen 2;

[0050] Injection: The moving template 2 and the support plate 3 maintain a fixed gap 9, and the plastic melt enters the cavity 203; since the thickness of the molding cavity 203 is relatively large at this time, the cross-sectional area of ​​the plastic flow is relatively large, the injection pressure is small, and it is relatively easy to mold.

[0051] Compression: When the amount of melt entering the cavity 203 meets the preset volume, the support plate 3 is controlled to move towards the moving template 2. The support plate 3 drives the core 202 to move, compressing the volume of the cavity 203 until the fixed gap 9 is 0.

[0052] Thin-walled part 204 is obtained through pressure holding, cooling, demolding, and post-processing.

[0053] Specifically in this embodiment, the post-processing includes removing the plastic structure formed in the overflow tank 205.

[0054] Specifically in this embodiment, before the mold opening step, the fixed gap 9 between the support plate 3 and the moving template 2 is adjusted to 0 using the mold locking mechanism 7; this ensures that the mold closing force can compress the fixed gap 9 to 0 during the subsequent compression process, thereby obtaining a part 204 of a preset size.

[0055] Specifically, in this embodiment, the mold opening step includes opening the mold locking mechanism 7, and adjusting the fixed gap 9 between the bearing plate 3 and the moving template 2 to a preset value under the action of the elastic mechanism 6. In this embodiment, the fixed gap is adjusted to 2mm, which is beneficial for producing parts with similar dimensions such as 0.3mm and 0.38mm. If the fixed gap 9 is too small, the parts are prone to not being fully formed, especially for thin-walled parts with long lengths, the problem is more serious.

[0056] In this embodiment, the core can move within the moving template by the movement of the support plate relative to the moving template, thereby adjusting the thickness of the part in the cavity. The relative movement can be such that the moving template remains stationary while the support plate moves, for example, the support plate can spring away from the position where it is tightly fitted to the moving template under the action of the elastic mechanism. Example 2

[0057] like Figures 1-10 The thin-walled part forming mold shown includes, in addition to the structure of Embodiment 1, the following scheme:

[0058] In this embodiment, the overflow groove 205 is located at the end of the part 204. This facilitates post-processing. For example, during the fabrication of UL test strips, post-processing at the end of the strip does not affect the strip test, while post-processing at the middle of the test area, such as generating burrs, affects the test accuracy.

[0059] In this embodiment, the overflow groove 205 is oriented perpendicular to the direction of the part 204 at its connection point with the part 204. This facilitates breaking it off directly at the connection point during post-processing.

[0060] In this embodiment, the fixed gap 9 is 2mm. To manufacture a 0.3mm part 204, the initial injection thickness of the cavity 203 is 2.3mm, which facilitates injection molding. During compression, the core 202 pushes the cavity 203 to reduce its thickness, and excess material is squeezed into the overflow groove 205. In other embodiments, different thicknesses can be set as needed.

[0061] In this embodiment, there are three cavities 203, which can be designed with different cores 202 to correspond to them. The parts 204 required for UL testing can be produced simultaneously, so that the parts 204 are produced in the same mold, ensuring that the melt of the parts 204 uses the same melt, resulting in smaller deviations and more accurate test results.

[0062] In this embodiment, the size of the fixed gap 9 can be adjusted by the elastic mechanism 6.

[0063] In this embodiment, the elastic mechanism 6 is disposed in the countersunk hole of the support plate 3 and / or the moving template 2. The elastic mechanism 6 includes an elastic unit 603, a sleeve 602 and a screw 601. The screw 601 passes through the support plate 3 and is fixedly connected to the moving template 2. The sleeve 602 is disposed outside the screw 601 and the elastic unit 6 is disposed outside the sleeve 602.

[0064] In this embodiment, the elastic mechanism 6 is one or more, preferably multiple, and the elastic force of the elastic mechanism 6 is greater than the injection pressure within the cavity 203 during injection molding. Multiple mechanisms distributed in different positions are more conducive to improving injection molding stability. The fact that the elastic force of the elastic mechanism 6 is greater than the injection pressure within the cavity 203 during injection molding ensures stable support of the elastic mechanism during injection molding, preventing core 202 vibration that could cause injection problems. It also stabilizes the distance of the fixed gap 9, preventing the fixed gap from becoming too small when the injection pressure is too high. This is better than the inability to calibrate during injection molding, which could lead to a thicker final product wall and failure to meet dimensional requirements.

[0065] In this embodiment, the elastic unit 603 is a spring, and the screw 601 connects the sleeve 602 and the spring in series and is fixed to the moving template 2.

[0066] In this embodiment, one end of the spring rests on the moving template 2, and the other end rests on the support plate 3, with the spring in a compressed state. This effectively maintains the fixed gap 9 between the moving template 2 and the support plate 3.

[0067] In this embodiment, the sleeve 602 is provided with a step 6021, which is located in the mounting countersunk hole 301 on the support plate 3. An assembly gap 6022 is formed between the mounting countersunk hole 301 and the step 6021. The assembly gap 6022 is equidistant from the fixed gap 9. The size of the fixed gap 9 between the support plate 3 and the moving template 2 can be precisely adjusted by adjusting the screw 601. In this embodiment, the adjustment by the screw 601 or the sleeve 602 refers to adjusting the size of the fixed gap 9 by tightening the screw 601. However, when there are multiple elastic mechanisms 6, the adjustment by the screw 601 may result in uneven adjustment. In this embodiment, the adjustment of the sleeve 602 includes adjusting by replacing the sleeve 602 with a sleeve of different height or by adding a shim of fixed height to the original sleeve 602. This method has good versatility and is applicable to multiple elastic mechanisms 6. The adjustment distance of the fixed gap 9 between the mold spring plate and the moving template is consistent at all points.

[0068] In this embodiment, the core 202 is detachably connected to the support plate 3. This facilitates the replacement of cores 202 of different thicknesses, thereby enabling the fabrication of thin-walled parts 204 of varying thicknesses. In other embodiments, only one type of part can be fabricated, and a fixed connection can suffice.

[0069] This embodiment also includes a mold-locking mechanism 7, which includes a fixed base 701 and a locking screw 702. The fixed base 701 is fixed to the support plate 3 or the fixed template 1. One end of the corresponding locking screw 702 is fixed in the connecting hole 103 on the fixed template 1 or the support plate 3, and the other end cooperates with the fixed base 701 to lock the support plate 3 and the fixed template 1. In this embodiment, the fixed base 701 is fixed to the support plate 3, and one end of the locking screw 702 is fixed in the connecting hole 103 of the fixed template 1. In other embodiments, the positions can be interchanged. In addition, in other embodiments, the connecting hole 103 can also be a countersunk hole, a through hole, etc., and the fixing method with the locking screw 702 can be a threaded connection or a nut connection separately set after passing through the connecting hole 103. These are all equivalent solutions to the connecting hole 103 in this application. The setting of the mold-locking mechanism 7 can compress the fixed gap 9 to 0 before the mold is installed on the injection molding machine, preventing the existence of the fixed gap 9 from affecting the subsequent compression process, and ensuring that the mold closing force can not complete the compression of the fixed gap 9. In use, the locking screw 702 passes through the fixing base 701 and is screwed into the connecting hole 103. The opening and closing gap of the mold, i.e. the fixed gap 9, is adjusted by tightening the locking screw 702.

[0070] In this embodiment, the fixing base is provided with a U-shaped through hole 703, and the locking screw 702 is inserted into the fixing base 701 through the opening of the U-shaped through hole 703; in this embodiment, the connecting hole 103 is provided with internal threads, which are used in conjunction with the locking screw 702. Compared with a closed round hole, the U-shaped through hole 703 allows the locking screw 702 to be easily removed when the mold is opened after the injection molding machine is installed.

[0071] In this embodiment, the U-shaped through hole 703 is provided with a receiving cavity 704, which is used to receive the head structure (such as a cup head) of the locking screw 702. Specifically, in this embodiment, the receiving cavity 704 is a countersunk hole structure, and in conjunction with the U-shaped through hole 703, the receiving cavity 704 is also a U-shaped structure. The U-shape in this application is not strictly U-shaped; it is only necessary that the opening on one side is large enough for the rod or cup head of the locking screw 702 to be placed and removed from the opening. By setting the receiving cavity 704 and the U-shaped through hole 703, the locking screw 702 can be tightened through the platform at the connection between the receiving cavity 704 and the U-shaped through hole 703 and the connecting hole 103, thereby compressing the fixing gap 9 to 0. The side U-shaped structure allows for side placement and removal of the locking screw 702, reducing the installation space requirement in the length direction of the locking screw 702.

[0072] In this embodiment, an air blowing mechanism 8 is also included. The air blowing mechanism 8 is fixed on the moving template 2 and blows air at a certain position on the surface of the mold cavity 203 during demolding to assist in the demolding of the thin sheet part 204. The air blowing mechanism 8 is adjustable in direction. For the thin-walled part 204 manufactured by the present application, the air blowing mechanism 8 provides a better demolding assistance effect.

[0073] In this embodiment, the air blowing mechanism 8 includes an air inlet 801, an air blowing port 802, and a rotating structure 803 as shown in the figure. Figure 10 As shown. The air inlet 801 of this application can be connected to the air valve of an injection molding machine. During operation, the air outlet 802 of the air blowing mechanism 8 is aligned with a specific position within the cavity 203 to blow air, thereby achieving rapid demolding of the thin-walled part 204. The rotating structure 803 can be adjusted in position as needed.

[0074] This embodiment also includes a flow channel turning mechanism 10, which comprises a main flow channel 1001, a turning valve 1002, and multiple branch flow channels 1003 arranged sequentially. The main flow channel 1001 is selectively connected to the multiple branch flow channels 1003 through the turning valve 1002. The melt in the main flow channel 1001 is turned to one or more branch flow channels 1003 by the turning valve 1002. This facilitates setting up multiple molds in one mold and selecting the molding of different parts 204 as needed. In this embodiment, the turning valve 1002 is a one-way valve, that is, it selects one of the multiple branch flow channels 1003. In other embodiments, other forms of multiple connected turning valves 1002 can be set, which can be implemented by those skilled in the art without creative effort based on the concept of this application.

[0075] In operation, the basic functions of this embodiment are the same as those of Embodiment 1. Other elastic mechanisms 6, locking mechanisms 7, and air blowing mechanisms 8 have been described separately and will not be repeated here.

[0076] It should be noted that the threads in this application are not shown, as will be understood by those skilled in the art.

[0077] It should be noted that the structural name in this application is not limited to this name; for example, a bearing plate can also be called a spring plate, as those skilled in the art will understand.

[0078] It should be noted that the above embodiments are merely examples of one or more technical solutions in this application. The components used can be selected or replaced by those skilled in the art based on their needs, and do not exceed the protection scope of this application.

Claims

1. A thin-walled part forming mold, characterized in that, It includes a fixed template, a movable template, and a support plate. The fixed template has a feed inlet and a fixed mold core. The movable template has a movable mold core and a core. The fixed mold core, the movable mold core, and the core form a cavity. The core can move within the movable template by moving the support plate relative to the movable template, thereby adjusting the thickness of the part in the cavity. The moving template and the support plate are fixedly connected by one or more elastic mechanisms, and the elastic mechanisms can form a fixed gap between the moving template and the support plate. During the injection molding process, the support plate squeezes the elastic mechanism to make the fixed gap zero, thereby driving the core to compress the cavity volume and obtain a thin-walled part. The cavity includes a part and an overflow channel. The overflow channel is located at the edge of the part and its volume is greater than that of the part, so that the overflow channel is not filled with material during the injection molding process.

2. The molding die according to claim 1, characterized in that, The overflow trough is located at the end of the part.

3. The molding die according to claim 1, characterized in that, The overflow trough is positioned perpendicular to the direction of the part at its connection point with the part.

4. The molding die according to claim 1, characterized in that, The cavity is multiple.

5. The molding die according to claim 1, characterized in that, The size of the fixed gap can be adjusted by a spring mechanism.

6. The molding die according to claim 1, characterized in that, The elastic mechanism is located in the countersunk hole of the support plate and / or the moving template. The elastic mechanism includes an elastic unit, a sleeve and a screw. The screw passes through the support plate and is fixedly connected to the moving template. The sleeve is located outside the screw and the elastic unit is located outside the sleeve.

7. The molding die according to claim 6, characterized in that, The elastic unit is a spring, and the sleeve and spring are connected in series by screws and fixed to the moving template.

8. The molding die according to claim 7, characterized in that, One end of the spring rests against the moving template, and the other end rests against the support plate; the spring is in a compressed state.

9. The molding die according to claim 6, characterized in that, The sleeve is provided with a step, which is located in the mounting countersunk hole on the support plate. An assembly gap is formed between the mounting countersunk hole and the step. The assembly gap is equal to the fixed gap. The size of the fixed gap between the support plate and the moving template can be precisely adjusted by adjusting the screws.

10. The molding die according to claim 1, characterized in that, The core and the support plate are detachably connected.

11. The molding die according to claim 1, characterized in that, It also includes a mold-locking mechanism, which includes a fixed base and a locking screw. The fixed base is fixed on the support plate or the fixed template, and one end of the corresponding locking screw is fixed in the connecting hole on the fixed template or the support plate, while the other end cooperates with the fixed base to lock the support plate and the fixed template.

12. The molding die according to claim 11, characterized in that, The mounting base is provided with a U-shaped through hole, and the locking screw is inserted into the mounting base through the opening of the U-shaped through hole; the connecting hole is provided with internal thread and is used in conjunction with the locking screw.

13. The molding die according to claim 12, characterized in that, The U-shaped through hole is provided with a receiving cavity, which is used to accommodate the head structure of the locking screw.

14. The molding die according to claim 1, characterized in that, It also includes an air blowing mechanism, which is fixed on the moving template and blows air at a certain position on the surface of the mold cavity during demolding to assist in the demolding of the thin sheet part; the air blowing mechanism can be rotated and adjusted.

15. The molding die according to claim 1, characterized in that, It also includes a flow channel turning mechanism, which includes a main flow channel, a turning valve, and multiple branch flow channels arranged in sequence. The main flow channel is selectively connected to the multiple branch flow channels through the turning valve.

16. The molding method of the molding die according to any one of claims 1 to 15, characterized in that, Includes the following steps: Mold opening: After the mold is loaded into the injection molding machine, the mold is opened, and the elastic mechanism will create a fixed gap between the support plate and the moving platen. Injection: The moving template and the support plate maintain a fixed gap, and the molten plastic enters the mold cavity; Compression: When the amount of melt entering the cavity meets the preset volume, the control plate moves towards the moving template, and the support plate drives the core to move, compressing the cavity volume until the fixed gap is 0; Thin-walled parts are obtained through pressure holding, cooling, demolding, and post-processing.

17. The molding method according to claim 16, characterized in that, Before the mold is opened, the fixed gap between the support plate and the moving mold plate is adjusted to 0 using the mold locking mechanism.

18. The molding method according to claim 16, characterized in that, The mold opening process includes opening the mold locking mechanism and adjusting the fixed gap between the support plate and the moving mold plate to a preset value under the action of the elastic mechanism.

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