A thermoforming preparation method for composite plates

Abstract

A method for thermoforming a composite plate includes the following steps: First, in step S1, the mold assembly is fed with material. In step S2, the mold assembly in the cavity is heated in the first stage, with the heating temperature controlled at 200-260 degrees Celsius, which is beneficial for the powder to form a uniform and stable pre-melted state. In step S3, the mold assembly is heated in the second stage by a heating plate, with the heating temperature controlled at 330-380 degrees Celsius. At this time, the powder is in a completely molten state. Then, when the heating plate is turned off, air is continuously blown onto the mold assembly by a blower assembly, and the cavity is pressurized again and held for 3-7 minutes. Finally, in step S4, air is continuously blown onto the mold assembly through the air outlet of the blower assembly. Once the temperature of the mold assembly reaches 150-180 degrees Celsius, it can be demolded.

Description

Technical Field

[0001] This invention relates to the technical field of composite panels, and more specifically to a thermoforming method for preparing composite panels. Background Technology

[0002] Composite panels need to simultaneously meet multiple characteristics such as high strength, good toughness, light weight, and strong processing plasticity, so the requirements for their production and preparation process are often quite high.

[0003] The common method for preparing composite panels involves placing molding powder into a specific mold, heating it to a molten state inside a furnace, and then allowing it to cool naturally in stages to obtain the finished product. However, in this method, because the specific mold remains inside the furnace, the cooling time is relatively long, severely limiting the efficiency of production and making it unsuitable for mass production. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that the production and preparation of composite boards in the prior art is inefficient and cannot be mass-produced due to the inability to cool them efficiently.

[0005] To address the above problems, this invention provides a method for thermoforming composite plates, comprising the following steps:

[0006] S1. Prepare the mold assembly, which includes a base plate, an annular mold frame, and a top plate. The top plate is provided with a pressing part that has the same shape as the inner ring of the annular mold frame. When adding material, first place the annular mold frame on the base plate and add the material powder into the interior of the annular mold frame. Then insert the pressing part of the top plate into the interior of the annular mold frame until the pressing part abuts against the top of the material powder. The material addition is then complete.

[0007] S2. Place the mold assembly inside the furnace chamber. The side wall of the chamber is provided with multiple heating plates distributed circumferentially. The upper part of the furnace body is provided with an exhaust pipe that connects to the upper part of the chamber. The lower part of the furnace body is provided with a blower assembly, which includes an air supply pipe and a diversion chamber. The diversion chamber is elongated and arranged laterally. The interior of the diversion chamber is provided with a cavity. The air supply pipe connects to the cavity from the outside of the furnace body. The diversion chamber is provided with an air outlet that opens laterally and extends to the lower part of the chamber. During heating, the exhaust pipe is first closed. While pressurizing the interior of the chamber, the temperature inside the chamber is raised to 200-260 degrees Celsius through the heating plates and maintained for 80-110 minutes. Then the exhaust pipe is opened to release the pressure.

[0008] S3. The temperature inside the cavity is further raised to 330-380 degrees Celsius by the heating plate and kept at that temperature for at least 10 minutes. Then the heating plate is turned off, and the blower assembly blows air into the mold assembly through the air outlet for 3-7 minutes. Then the exhaust pipe is closed, the cavity is pressurized again, and the pressure is maintained for 3-7 minutes before the exhaust pipe is opened to release the pressure.

[0009] S4. The blower assembly continuously blows air onto the mold assembly through the air outlet, causing the mold assembly to reach a temperature of 150-180 degrees Celsius before demolding.

[0010] Compared with the prior art, the above solution first completes the feeding of the mold assembly in step S1, and then heats the mold assembly in the cavity in the first stage in step S2. The heating temperature of the first stage is controlled at 200-260 degrees Celsius, which is conducive to the formation of a uniform and stable pre-melted state of the powder. Then, in step S3, the mold assembly is heated in the second stage by a heating plate. The heating temperature of the second stage is controlled at 330-380 degrees Celsius and held for at least 10 minutes. At this time, the powder is in a completely molten state. Then, when the heating plate is turned off, air is continuously blown into the mold assembly through the air outlet of the blower assembly, which can effectively prevent the molten powder from flowing out from the gap between the annular mold frame and the bottom plate. Then, the cavity is pressurized again and held for 3-7 minutes, thus initially forming the composite plate. Finally, in step S4, the blower assembly continuously blows air into the mold assembly through the air outlet to accelerate the cooling of the mold assembly and improve the preparation efficiency. The mold assembly can be demolded when the temperature reaches 150-180 degrees Celsius.

[0011] Preferably, the diversion chamber is provided with an upper guide plate above the air outlet and a lower guide plate below the air outlet, both of which are arranged obliquely upwards; the side of the diversion chamber is provided with an inlet pipe and an outlet pipe, and the side of the upper guide plate facing the lower guide plate is provided with a water-cooling pipe arranged horizontally, the side of the water-cooling pipe facing the lower guide plate is arc-shaped, one end of the water-cooling pipe is connected to the inlet pipe and the other end is connected to the outlet pipe;

[0012] In step S4, when the blower assembly continuously blows air to the mold assembly through the air outlet, the water inlet pipe starts to supply water, and the water supplied by the water supply pipe flows through the water cooling pipe and is discharged from the water outlet pipe.

[0013] The upper and lower guide plates are designed to create an upward-sloping airflow from the outlet, ensuring that after contacting the mold components and carrying away heat, the airflow can directly flow to the exhaust duct and be discharged. Since the air outlet area of ​​the distribution chamber is located inside the cavity, the water-cooling pipes can cool the upper guide plate, thus maintaining a lower temperature as the airflow passes between the upper and lower guide plates, resulting in better subsequent cooling.

[0014] Preferably, the chamber is square, and the annular mold frame is square;

[0015] In step S4, the mold assembly is first rotated so that the four corners of the annular mold frame face the four side walls of the chamber. Then, the blower assembly continuously blows air onto the mold assembly through the air outlet. By rotating the mold assembly in step S4 so that the four corners of the annular mold frame face the four side walls of the chamber, the corners of the annular mold frame can be close to the heating plate and receive the residual heat from the heating plate. This ensures that the annular mold frame is cooled uniformly throughout during the cooling process, which is beneficial to improving the quality of the final product.

[0016] Preferably, the furnace body is provided with a support frame at the bottom, the upper part of the support frame is provided with a receiving cavity, the side of the support frame is provided with an elongated groove that is arranged horizontally and penetrates into the receiving cavity, the bottom surface of the cavity is provided with a rotating hole that penetrates vertically into the receiving cavity, a rotating shaft is provided in the rotating hole, the upper end of the rotating shaft is provided with a shelf located in the cavity, and the lower end is provided with a limiting rod located in the receiving cavity, the limiting rod has an adjusting end that extends into the elongated groove;

[0017] In steps S2, S3, and S4, the mold assembly is placed on the shelf. In step S4, the shelf is rotated by pushing the adjusting end of the limiting rod, thereby rotating the mold assembly so that the four corners of the annular mold frame face the four side walls of the cavity. The operation is simple and convenient.

[0018] Preferably, the upper part of the shelf is provided with a radially arranged guide rail, and the bottom surface of the base plate is provided with a guide groove for engaging with the guide rail, and the guide groove is parallel to any side of the annular mold frame.

[0019] In step S4, when the adjusting end of the limiting rod is pushed against one end of the elongated groove, the angle between the guide rail and the front / rear sidewall of the chamber is 90°; when the adjusting end of the limiting rod is pushed against the other end of the elongated groove, the angle between the guide rail and the front / rear sidewall of the chamber is 45°.

[0020] When the limiting rod is pushed so that the angle between the guide rail and the front / rear sidewall of the chamber is 90°, the operator can easily remove the mold assembly from the shelf; when the limiting rod is pushed so that the angle between the guide rail and the front / rear sidewall of the chamber is 45°, the distance between the corner of the annular mold frame and the heating plate is the closest, and the corner of the annular mold frame can receive more residual heat from the heating plate. Attached Figure Description

[0021] Figure 1 A front view schematic diagram of an apparatus for preparing aerospace sheet metal.

[0022] Figure 2 This is a front view schematic diagram of an apparatus for preparing aerospace sheet metal;

[0023] Figure 3 For along Figure 2 Cross-sectional view of section AA in the middle;

[0024] Figure 4 A schematic diagram of a cross-section of an apparatus for preparing aerospace sheet metal;

[0025] Figure 5 A schematic cross-sectional view of a mold assembly in an apparatus for preparing aerospace sheet metal.

[0026] Figure 6 This is a schematic diagram of the annular mold frame and base plate of an aerospace sheet metal preparation device;

[0027] Figure 7 A schematic diagram of an embodiment of a blower assembly for an aerospace sheet metal preparation apparatus;

[0028] Figure 8 A cross-sectional schematic diagram of an embodiment of a blower assembly for an aerospace sheet metal preparation apparatus;

[0029] Figure 9 A schematic diagram of another embodiment of the blower assembly of an apparatus for preparing aerospace sheet metal;

[0030] Figure 10 A cross-sectional schematic diagram of another embodiment of the blower assembly of an aerospace sheet metal preparation apparatus;

[0031] Figure 11 This is a schematic diagram of a shelf and a limiting rod in a device for preparing aerospace sheet metal.

[0032] Explanation of reference numerals in the attached figures.

[0033] 1. Furnace body; 11. Chamber; 111. Rotary hole; 112. Rotary shaft; 12. Exhaust pipe; 121. Switch; 122. Exhaust port; 13. Door panel; 2. Mold assembly; 21. Base plate; 211. Guide groove; 22. Annular mold frame; 221. Ventilation hole; 23. Top plate; 231. Pressing section; 232. Guide surface; 3. Blower assembly; 31. Air supply pipe; 32. Diversion chamber; 32a. Rectifying area; 32b. Air outlet area; 321. Cavity; 322. Air outlet; 323. Upper guide plate; 324. Lower guide plate; 325. Water cooling pipe; 326. Water inlet pipe; 327. Water outlet pipe; 4. Heating plate; 5. Support frame; 51. Receiving cavity; 52. Long groove; 6. Shelf; 61. Guide rail; 7. Limiting rod. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should also be noted that all directional indications (such as up, down, left, right, front, back, inside, outside) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] Example 1

[0036] Please see Figures 1-8 , Figure 11 The present invention provides a method for thermoforming a composite plate, comprising the following steps:

[0037] S1. Prepare mold assembly 2. Mold assembly 2 includes a base plate 21, an annular mold frame 22 and a top plate 23. The top plate 23 is provided with a pressing part 231 with the same shape as the inner ring of the annular mold frame 22. When feeding material, first place the annular mold frame 22 on the base plate 21 and add the material powder into the interior of the annular mold frame 22. Then insert the pressing part 231 of the top plate 23 into the interior of the annular mold frame 22 until the pressing part 231 abuts against the top of the material powder. The feeding is then completed.

[0038] S2. Place the mold assembly 2 inside the chamber 11 of the furnace body 1. The side wall of the chamber 11 is provided with multiple heating plates 4 distributed circumferentially. The upper part of the furnace body 1 is provided with an exhaust pipe 12 that connects to the upper part of the chamber 11. The lower part of the furnace body 1 is provided with a blower assembly 3. The blower assembly 3 includes an air supply pipe 31 and a diversion chamber 32. The diversion chamber 32 is elongated and arranged horizontally. The interior of the diversion chamber 32 is provided with a cavity 321. The air supply pipe 31 connects to the cavity 321 from the outside of the furnace body 1. The diversion chamber 32 is provided with an air outlet 322 that is opened horizontally and extends to the lower part of the chamber 11. During heating, the exhaust pipe 12 is first closed. While pressurizing the interior of the chamber 11, the temperature inside the chamber 11 is raised to 200-260 degrees Celsius through the heating plates 4 and maintained for 80-110 minutes. Then the exhaust pipe 12 is opened to release the pressure.

[0039] S3. The temperature inside the chamber 11 is further raised to 330-380 degrees Celsius by the heating plate 4 and kept at that temperature for at least 10 minutes. Then the heating plate 4 is turned off, and the blower assembly 3 blows air into the mold assembly 2 through the air outlet 322 for 3-7 minutes. Then the exhaust pipe 12 is closed, the inside of the chamber 11 is pressurized again, and the pressure is maintained for 3-7 minutes before the exhaust pipe 12 is opened to release the pressure.

[0040] S4. The blower assembly 3 continuously blows air to the mold assembly 2 through the air outlet 322, so that the temperature of the mold assembly 2 reaches 150-180 degrees Celsius and then it is demolded.

[0041] The above scheme first completes the feeding of the mold component 2 in step S1. In this embodiment, the main component of the powder is polyimide molding powder. In step S2, the mold component 2 in the cavity 11 is heated in the first stage. The heating temperature of the first stage is controlled at 200-260 degrees Celsius, preferably 240 degrees Celsius, which is conducive to the formation of a uniform and stable pre-melted state of the powder. Then, in step S3, the mold component 2 is heated in the second stage by the heating plate 4. The heating temperature of the second stage is controlled at 330-380 degrees Celsius, preferably 350 degrees Celsius, and the temperature is maintained for at least 10 minutes. At this time, the powder is in a completely molten state. Subsequently, when the heating plate... When the mold assembly is closed, air is continuously blown into the mold assembly 2 through the air outlet 322 of the blower assembly 3, which can effectively prevent the molten powder from flowing out from the gap between the annular mold frame 22 and the base plate 21. Then, the inside of the chamber 11 is pressurized again and the pressure is maintained for 3 to 7 minutes, thus initially forming a composite plate. Finally, in step S4, the blower assembly 3 continues to blow air into the mold assembly 2 through the air outlet 322 to accelerate the cooling of the mold assembly 2 and improve the preparation efficiency. The mold assembly 2 can be demolded after the temperature reaches 150 to 180 degrees Celsius.

[0042] As an optimization of the above scheme, the diversion chamber 32 is provided with an upper guide plate 323 located above the air outlet 322 and a lower guide plate 324 located below the air outlet 322. Both the upper guide plate 323 and the lower guide plate 324 are arranged obliquely upward. The side of the diversion chamber 32 is provided with a water inlet pipe 326 and a water outlet pipe 327. The side of the upper guide plate 323 facing the lower guide plate 324 is provided with a water cooling pipe 325 arranged horizontally. The side of the water cooling pipe 325 facing the lower guide plate 324 is arc-shaped. One end of the water cooling pipe 325 is connected to the water inlet pipe 326 and the other end is connected to the water outlet pipe 327.

[0043] In step S4, when the blower assembly 3 continuously blows air to the mold assembly 2 through the air outlet 322, the water inlet pipe 326 starts to supply water, and the water supplied by the water supply pipe flows through the water cooling pipe 325 and is discharged from the water outlet pipe 327.

[0044] The upper guide plate 323 and the lower guide plate 324 are arranged so that the airflow from the air outlet 322 forms an upward oblique flow direction, ensuring that the airflow can flow directly to the exhaust pipe 12 and be discharged after contacting the mold assembly 2 and carrying away heat. Since the air outlet area 32b of the flow distribution chamber 32 is located inside the chamber 11, the water cooling pipe 325 can cool the upper guide plate 323, and thus the airflow can be kept at a lower temperature when it flows between the upper guide plate 323 and the lower guide plate 324, achieving a better cooling effect in the future.

[0045] In this embodiment, the chamber 11 is square, and the annular mold frame 22 is rectangular;

[0046] In step S4, the mold assembly 2 is first rotated so that the four corners of the annular mold frame 22 face the four side walls of the chamber 11 respectively. Then, the blower assembly 3 continuously blows air onto the mold assembly 2 through the air outlet 322. In step S4, by first rotating the mold assembly 2 so that the four corners of the annular mold frame 22 face the four side walls of the chamber 11 respectively, the corners of the annular mold frame 22 can be close to the heating plate 4 and receive the residual heat of the heating plate 4, thereby ensuring that the annular mold frame 22 is cooled uniformly as a whole during the cooling process, which is beneficial to improving the quality of the final product.

[0047] As an optimization of the above scheme, a support frame 5 is provided at the bottom of the furnace body 1, and a receiving cavity 51 is provided at the upper part of the support frame 5. An elongated groove 52 is provided on the side of the support frame 5, which is arranged horizontally and extends through the receiving cavity 51. A rotating hole 111 is provided on the bottom surface of the chamber 11, which extends vertically through the receiving cavity 51. A rotating shaft 112 is provided in the rotating hole 111. A shelf 6 located in the chamber 11 is provided at the upper end of the rotating shaft 112, and a limiting rod 7 located in the receiving cavity 51 is provided at the lower end. The limiting rod 7 has an adjustment end that extends into the elongated groove 52.

[0048] In steps S2, S3, and S4, the mold assembly 2 is placed on the shelf 6. In step S4, the shelf 6 is rotated by pushing the adjusting end of the limiting rod 7, thereby rotating the mold assembly 2 so that the four corners of the annular mold frame 22 face the four side walls of the cavity 11 respectively. The operation is simple and convenient.

[0049] As an optimization of the above scheme, the upper part of the shelf 6 is provided with a radially arranged guide rail 61, and the bottom surface of the base plate 21 is provided with a guide groove 211 for fitting to the guide rail 61, and the guide groove 211 is parallel to the long side of the annular mold frame 22.

[0050] In step S4, when the adjusting end of the push-limiting rod 7 abuts against one end of the elongated groove 52, the angle between the guide rail 61 and the front / rear sidewall of the chamber 11 is 90°; when the adjusting end of the push-limiting rod 7 abuts against the other end of the elongated groove 52, the angle between the guide rail 61 and the front / rear sidewall of the chamber 11 is 45°.

[0051] When the limiting rod 7 is pushed so that the angle between the guide rail 61 and the front / rear side wall of the chamber 11 is 90°, the operator can easily remove the mold assembly 2 from the shelf 6; while when the limiting rod 7 is pushed so that the angle between the guide rail 61 and the front / rear side wall of the chamber 11 is 45°, the distance between the corner of the annular mold frame 22 and the heating plate 4 is the closest, and the corner of the annular mold frame 22 can receive more residual heat from the heating plate 4.

[0052] Example 2

[0053] Please see Figures 2-8 , Figure 10 An embodiment of the present invention provides an apparatus for preparing aerospace sheet metal, comprising:

[0054] Furnace body 1, furnace body 1 is provided with a chamber 11 and an exhaust pipe 12 connected to the upper part of the chamber 11. The side wall of the chamber 11 is provided with a plurality of heating plates 4 arranged around the mold assembly 2. The exhaust pipe 12 is provided with a switch 121 for controlling the conduction state of the exhaust pipe 12.

[0055] Mold assembly 2 is placed in chamber 11. Mold assembly 2 includes a base plate 21, an annular mold frame 22 for placing powder on the base plate 21, and a top plate 23 on the annular mold frame 22. The top plate 23 is provided with a pressing part 231 extending into the annular mold frame 22.

[0056] The blower assembly 3 includes an air supply pipe 31 and a diversion chamber 32 connected to the furnace body 1. The diversion chamber 32 is elongated and arranged laterally. The interior of the diversion chamber 32 has a cavity 321, the shape of which corresponds to the shape of the diversion chamber 32. The diversion chamber 32 includes an air outlet area 32b extending to the lower part of the chamber 11 and a rectifier area 32a extending to the outside of the furnace body 1. The height of the cavity 321 of the rectifier area 32a is greater than the height of the cavity 321 of the air outlet area 32b. The air outlet area 32b has an air outlet 322 opened laterally. The air supply pipe 31 is connected to the cavity 321 of the rectifier area 32a, and the air outlet 322 is connected to the cavity 321 of the air outlet area 32b. The air outlet 322 is arranged facing the mold assembly 2.

[0057] Compared with the prior art, the above solution firstly achieves the function of heating and molding the powder in the mold assembly 2 within the chamber 11 by setting a heating plate 4 in the chamber 11 of the furnace body 1; at the same time, by setting the blower assembly 3, the airflow provided by the air supply pipe 31 is diverted through the cavity 321 of the diversion chamber 32 and flows into the interior of the chamber 11 through the air outlet 322, and is finally discharged through the exhaust pipe 12, thereby achieving the function of accelerated cooling of the mold assembly 2, which helps to improve production efficiency; in addition, the diversion chamber 3 2 is divided into a rectification zone 32a and an air outlet zone 32b. Since the height of the cavity 321 in the rectification zone 32a is greater than the height of the cavity 321 in the air outlet zone 32b, when the airflow flows from the cavity 321 in the rectification zone 32a to the cavity 321 in the air outlet zone 32b, not only will the flow velocity increase, but the airflow will also be split laterally. This results in the airflow from the air outlet 322 having a better purging effect and a larger purging area, which helps to achieve uniform cooling of the mold component 2 and ensure the final product quality.

[0058] In this embodiment, the chamber 11 is square, and the shape of the annular mold frame 22 is consistent with that of the chamber 11. A window connecting to the outside is provided on the front side of the chamber 11, and a door panel 13 is hinged to the left side of the window for opening and closing. Heating plates 4 are provided on the left, right, and rear sides of the chamber 11, with the heating plate 4 located on the side of the door panel 13 facing the chamber 11. Two blower assemblies 3 are symmetrically arranged on the left and right sides of the furnace body 1. The air outlet 322 of the blower assembly 3 on the left side of the furnace body 1 is parallel to the left side of the furnace body 1, and the air outlet 322 of the blower assembly 3 on the right side of the furnace body 1 is parallel to the right side of the furnace body 1. This allows for uniform heating of the mold assembly 2 through the four heating plates 4, and the symmetrical arrangement of the blower assemblies 3 on the left and right sides of the chamber 11 helps to achieve uniform cooling of the mold, which is beneficial to improving the quality of the finished product inside the mold assembly 2. Preferably, both blower assemblies 3 are located below the heating plates 4, which facilitates better airflow to remove heat from the chamber 11. Furthermore, it should be noted that the aforementioned "the shape of cavity 321 corresponds to that of the diversion chamber 32" means that the shape of cavity 321 is the same as that of diversion chamber 32. That is, the width of cavity 321 in the rectification zone 32a of diversion chamber 32 is equal to the width of cavity 321 in the air outlet zone 32b of diversion chamber 32, and the height of cavity 321 in rectification zone 32a is greater than the height of cavity 321 in air outlet zone 32b, thereby making the cross-sectional area of ​​flow in rectification zone 32a greater than the cross-sectional area of ​​cavity 321 in air outlet zone 32b.

[0059] In this embodiment, the air outlet area 32b is provided with an upper guide plate 323 located above the air outlet 322 and a lower guide plate 324 located below the air outlet 322. Both the upper guide plate 323 and the lower guide plate 324 are arranged obliquely upward, so that the airflow flowing out of the air outlet 322 forms an obliquely upward flow direction, ensuring that the airflow can flow directly to the exhaust pipe 12 and be discharged after contacting the mold assembly 2 and carrying away heat.

[0060] like Figure 9 and Figure 10 As shown, in another embodiment, the diversion chamber 32 is further provided with an inlet pipe 326 and an outlet pipe 327. A water-cooling pipe 325 is provided on the side of the upper guide plate 323 facing the lower guide plate 324, arranged laterally. The side of the water-cooling pipe 325 facing the lower guide plate 324 is arc-shaped, with one end connected to the inlet pipe 326 and the other end connected to the outlet pipe 327. Since the air outlet area 32b of the diversion chamber 32 is located inside the chamber 11, the arrangement of the water-cooling pipe 325 can cool the upper guide plate 323, thereby maintaining a lower temperature when the airflow passes between the upper guide plate 323 and the lower guide plate 324, achieving a better subsequent cooling effect.

[0061] In this embodiment, the annular mold frame 22 is provided with a plurality of ventilation holes 221 distributed circumferentially. One end of the ventilation hole 221 extends through the upper end face of the annular mold frame 22 and the other end extends through the lower part of the outer side of the annular mold frame 22, so that the airflow blown out by the air outlet 322 can enter the ventilation hole 221, thereby achieving a better cooling effect on the annular mold frame 22.

[0062] In this embodiment, the pressing part 231 is connected to the middle of the lower end face of the top plate 23. The outer edge of the lower end face of the top plate 23 is located above the upper end face of the annular mold frame 22. When the pressing part 231 comes into contact with the powder in the annular mold frame 22, there is a gap between the outer edge of the lower end face of the top plate 23 and the upper end face of the annular mold frame 22. Thus, after the airflow flows out from the ventilation hole 221, it will first contact the top plate 23 and then flow to the exhaust pipe 12, achieving a better cooling effect on the top plate 23. Furthermore, the outer edge of the lower end face of the top plate 23 is provided with an inclined guide surface 232, so that the gap between the lower end face of the top plate 23 and the upper end face of the annular mold frame 22 gradually increases from the inside to the outside. The exhaust pipe 12 is provided with an annular exhaust port 122 at one end located in the upper part of the chamber 11, so that the airflow flowing out from the ventilation hole 221 can flow more smoothly to the exhaust port 122 under the guidance of the guide surface 232. The switch 121 is preferably a gas valve and is located outside the furnace body 1, so that the exhaust pipe 12 can be easily controlled to switch between the open and closed states.

[0063] As an extension of the above embodiments, the above scheme also includes a support frame 5, a shelf 6, and a limiting rod 7. The furnace body 1 is placed above the support frame 5. The upper part of the support frame 5 is provided with a receiving cavity 51. The side of the support frame 5 is provided with an elongated groove 52 that is arranged horizontally and extends through the receiving cavity 51. The bottom surface of the chamber 11 is provided with a rotating hole 111 that extends vertically through the receiving cavity 51. A rotating shaft 112 is provided in the rotating hole 111. The upper end of the rotating shaft 112 is connected to the lower part of the shelf 6 and the lower end extends into the receiving cavity 51. The limiting rod 7 includes a connecting end connected to the lower end of the rotating shaft 112 and an adjusting end that extends into the elongated groove 52. The mold assembly 2 is placed on the shelf 6. By pushing the adjusting end of the limiting rod 7, the mold assembly 2 on the shelf 6 can be rotated horizontally, thereby conveniently adjusting the angle of the mold assembly 2 in the chamber 11.

[0064] Furthermore, the upper part of the shelf 6 is provided with a radially arranged guide rail 61, and the bottom surface of the base plate 21 is provided with a guide groove 211 for fitting to the guide rail 61. The guide groove 211 is parallel to the long side of the annular mold frame 22. When the adjusting end of the limiting rod 7 abuts against the rear end wall of the elongated groove 52, the angle between the guide rail 61 and the rear side wall of the chamber 11 is °. When the adjusting end of the limiting rod 7 abuts against the front end wall of the elongated groove 52, the angle between the guide rail 61 and the rear side wall of the chamber 11 is °. When the limiting rod 7 is adjusted so that the angle between the guide rail 61 and the rear wall of the chamber 11 is °, the operator can easily remove the mold assembly 2 from the shelf 6. When the limiting rod 7 is adjusted so that the angle between the guide rail 61 and the rear wall of the chamber 11 is °, the distance between the corner of the annular mold frame 22 and the heating plate 4 is the closest. The corner of the annular mold frame 22 can receive more residual heat from the heating plate 4, ensuring that the annular mold frame 22 is cooled uniformly throughout during the cooling process, which is beneficial to improving the quality of the final product.

[0065] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art will be able to make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of the invention.

Claims

1. A method for preparing a composite plate by thermoforming, characterized in that, Includes the following steps: S1. Prepare mold assembly (2). Mold assembly (2) includes base plate (21), annular mold frame (22) and top plate (23). The top plate (23) is provided with a pressing part (231) with the same shape as the inner ring of the annular mold frame (22). When adding material, first place the annular mold frame (22) on the base plate (21) and add the material powder into the interior of the annular mold frame (22). Then insert the pressing part (231) of the top plate (23) into the interior of the annular mold frame (22) until the pressing part (231) abuts against the top of the material powder. The material addition is completed. S2. Place the mold assembly (2) inside the chamber (11) of the furnace body (1). The side wall of the chamber (11) is provided with multiple heating plates (4) distributed circumferentially. The upper part of the furnace body (1) is provided with an exhaust pipe (12) that connects to the upper part of the chamber (11). The lower part of the furnace body (1) is provided with a blower assembly (3). The blower assembly (3) includes an air supply pipe (31) and a diversion chamber (32). The diversion chamber (32) is elongated and arranged laterally. The interior of the diversion chamber (32) is provided with a cavity (32). 1) The air supply pipe (31) is connected from the outside of the furnace body (1) to the cavity (321). The diversion chamber (32) is provided with an air outlet (322) that is opened horizontally and extends to the lower part of the cavity (11). When heating, the exhaust pipe (12) is closed first. While pressurizing the inside of the cavity (11), the temperature inside the cavity (11) is raised to 200-260 degrees Celsius by the heating plate (4) and maintained for 80-110 minutes. Then the exhaust pipe (12) is opened and the pressure is released. S3. The temperature inside the chamber (11) is further raised to 330-380 degrees Celsius by the heating plate (4) and kept warm for at least 10 minutes. Then the heating plate (4) is turned off, and the blower assembly (3) blows air into the mold assembly (2) through the air outlet (322) for 3-7 minutes. Then the exhaust pipe (12) is closed, the inside of the chamber (11) is pressurized again, and the pressure is maintained for 3-7 minutes before the exhaust pipe (12) is opened to release the pressure. S4. The blower assembly (3) continuously blows air to the mold assembly (2) through the air outlet (322) so that the temperature of the mold assembly (2) reaches 150-180 degrees Celsius and then the mold is removed. The chamber (11) is square, and the annular frame (22) is square; In step S4, the mold assembly (2) is rotated so that the four corners of the annular mold frame (22) face the four side walls of the chamber (11) respectively. Then the blower assembly (3) blows air to the mold assembly (2) through the air outlet (322). The furnace body (1) is provided with a support frame (5) at the bottom. The upper part of the support frame (5) is provided with a receiving cavity (51). The side of the support frame (5) is provided with an elongated groove (52) that is arranged horizontally and penetrates into the receiving cavity (51). The bottom surface of the chamber (11) is provided with a rotating hole (111) that penetrates vertically into the receiving cavity (51). A rotating shaft (112) is provided in the rotating hole (111). The upper end of the rotating shaft (112) is provided with a shelf (6) located in the chamber (11) and the lower end is provided with a limiting rod (7) located in the receiving cavity (51). The limiting rod (7) has an adjustment end that extends into the elongated groove (52). In steps S2, S3, and S4, the mold assembly (2) is placed on the shelf (6); in step S4, the shelf (6) is rotated by pushing the adjusting end of the limiting rod (7), thereby achieving the rotation of the mold assembly (2) so that the four corners of the annular mold frame (22) face the four side walls of the cavity (11).

2. The method for preparing a composite plate by thermoforming according to claim 1, characterized in that, The diversion chamber (32) is provided with an upper guide plate (323) above the air outlet (322) and a lower guide plate (324) below the air outlet (322). Both the upper guide plate (323) and the lower guide plate (324) are arranged obliquely upward. The side of the diversion chamber (32) is provided with a water inlet pipe (326) and a water outlet pipe (327). The side of the upper guide plate (323) facing the lower guide plate (324) is provided with a water cooling pipe (325) arranged horizontally. The side of the water cooling pipe (325) facing the lower guide plate (324) is arc-shaped. One end of the water cooling pipe (325) is connected to the water inlet pipe (326) and the other end is connected to the water outlet pipe (327). In step S4, when the blower assembly (3) continuously blows air to the mold assembly (2) through the air outlet (322), the water inlet pipe (326) starts to supply water, and the water supplied by the water supply pipe flows through the water cooling pipe (325) and is discharged from the water outlet pipe (327).

3. The method for preparing a composite plate by thermoforming according to claim 1, characterized in that, The upper part of the shelf (6) is provided with a radially arranged guide rail (61), and the bottom surface of the base plate (21) is provided with a guide groove (211) for fitting to the guide rail (61), and the guide groove (211) is parallel to any side of the annular mold frame (22). In step S4, when the adjusting end of the limiting rod (7) is pushed against one end of the elongated groove (52), the angle between the guide rail (61) and the front / rear sidewall of the chamber (11) is 90°; when the adjusting end of the limiting rod (7) is pushed against the other end of the elongated groove (52), the angle between the guide rail (61) and the front / rear sidewall of the chamber (11) is 45°.

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