A demoulding device and demoulding method for producing PEEK plates

Abstract

The present invention relates to the field of demolding technology, specifically to a demolding device and a demolding method for PEEK board production, comprising a lower mold and an upper mold that are adapted to each other, and the inner wall of the lower mold is provided with a molding groove that matches the target molding surface of the PEEK board, and also comprising a branch pipe, which is arranged inside the lower mold and can allow fluid to pass through, and the top of the branch pipe is provided with a plurality of cone plates, and the cone plates can exchange heat with a heat source to heat the fluid inside them, and the top of the cone plate is provided with a concave cylinder, and the concave cylinder is provided with a through hole for fluid discharge, and the inside of the branch pipe is provided with a heat exchange component that pushes the cone plate to move and exchange heat with the molding groove; a push rod, which is used to resist the PEEK board for demolding it from the molding groove, and the bottom of the molding groove is provided with a narrowed through groove for the push rod to pass through, and the narrowed through groove is constructed to be conical and adapted to the cone plate, and the bottom of the push rod is provided with a control component that adapts to the concave cylinder to control whether the fluid is discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of demoulding, in particular to a demoulding device for producing a PEEK plate and a demoulding method thereof. Background Art

[0002] Polyetheretherketone (PEEK), a high-performance specialty engineering plastic, boasts a range of exceptional properties, making it widely used in numerous high-end applications. PEEK boasts excellent high-temperature resistance, with long-term operating temperatures reaching 260°C and short-term temperatures exceeding 300°C. It maintains stable physical and chemical properties in high-temperature environments, without significant softening, deformation, or performance degradation due to temperature increases. PEEK also possesses excellent mechanical properties, including high strength, high modulus, good toughness, and impact resistance, enabling it to maintain structural integrity and functional stability under high loads and complex stress conditions. Furthermore, PEEK exhibits excellent chemical stability, with excellent resistance to most chemicals, including acids, alkalis, and organic solvents. It is resistant to chemical reactions and corrosion, enabling long-term use in harsh chemical environments. Its self-lubricating and wear-resistant properties also significantly reduce friction and wear between components, extending their service life. These exceptional properties have made PEEK an irreplaceable player in high-end applications such as aerospace, automotive, electronics, and medical devices. For example, in the aerospace field, PEEK can be used to manufacture aircraft engine parts, aircraft structural parts, etc., to reduce weight and improve performance; in the field of medical devices, PEEK is widely used in the manufacture of artificial joints, orthopedic implants, etc. due to its good biocompatibility. With the continuous expansion of the application fields of PEEK materials and the continuous growth of market demand, the production scale of PEEK boards is also expanding. At present, the production of PEEK boards mainly adopts the compression molding process. This process is to place a certain amount of PEEK powder raw material into the mold cavity, melt it, flow it and fill the mold cavity under high temperature and high pressure conditions, and after a certain period of heat preservation and pressure holding, cool it and solidify it to form a PEEK board of the desired shape and size. In the compression molding production process of PEEK boards, the demolding link is a crucial step.

[0003] For example, the patent document with the prior art publication number CN117549507A discloses a demolding device for PEEK board production, including: a workbench, a bracket, an arc mold and a pushing assembly. The top of the workbench is fixedly connected to a feeder, the top of the feeder is fixedly connected to a hopper, and one end of the feeder is fixedly connected to a fixed mold. The present invention drives the pull rod to extrude the C-shaped extrusion plate through the movement of the movable mold, so that the inclined surfaces at both ends of the C-shaped extrusion plate push the chamfer, so that the slider compresses the first spring, so that the two arc molds move away from each other, and the first arc strip and the second arc strip inside the two arc molds are disconnected, and finally the C-shaped plate is driven to move by the shift rod, and the C-shaped plate drives the two push rods to move and squeeze the reset spring, and the product is ejected by the two push rods to form the final demolding. The patent document allows the product to be demolded quickly through linkage, and does not require secondary grooving processing, thereby improving production efficiency.

[0004] Existing PEEK sheet demolding technology typically uses a pusher to contact the product to facilitate demolding. While this design concept provides a degree of convenience for PEEK sheet demolding, ideally, the height adjustment mechanism precisely controls the lift and speed of the pusher, smoothly ejecting the formed PEEK sheet from the mold. This seemingly effective demolding process is crucial. However, in actual production, this technical solution has exposed serious flaws. PEEK sheet production typically utilizes a high-temperature injection molding process. During the injection molding phase, the PEEK material is in a molten state, allowing it to smoothly fill the mold cavity. However, as the injection molding process completes, the PEEK sheet begins to cool and solidify. During this cooling process, due to the characteristics of PEEK material, it gradually shrinks and adheres tightly to the mold interior. As the temperature continues to drop, and once the PEEK sheet has completely cooled and solidified, the clamping force between it and the mold increases significantly. This increased clamping force is the result of a combination of factors. On the one hand, when the PEEK material cools and shrinks, it will generate an inward pulling force on the inner wall of the mold, making the contact between the sheet and the mold closer; on the other hand, the microstructure and texture of the mold surface will also increase the friction between the sheet and the PEEK sheet, further enhancing the holding force. Relevant experimental data show that after the PEEK sheet is completely cooled and shaped, the holding force between it and the mold can be increased by several times or even dozens of times compared to the initial cooling stage. When the existing height adjustment mechanism is used to drive the push plate for forced ejection, due to the limited contact area between the push plate and the PEEK sheet, and the uneven distribution of force applied during the ejection process, it is very easy to generate local stress concentration on the surface of the sheet. This local stress concentration often exceeds the bearing limit of the PEEK material, resulting in cracks, scratches and other damage on the surface of the sheet. To this end, the present application proposes a demolding device and a demolding method for PEEK sheet production. Summary of the Invention

[0005] The object of the present invention is to provide a demoulding device and a demoulding method for producing PEEK boards, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a demoulding device for producing PEEK plates, comprising a lower mold and an upper mold adapted to each other, wherein the inner wall of the lower mold is provided with a molding groove matching the target molding surface of the PEEK plate, and further comprising:

[0007] A branch pipe is provided inside the lower mold and allows fluid to pass through it. A plurality of cone plates are provided on the top of the branch pipe, and the cone plates can exchange heat with a heat source to heat the fluid inside. A concave cylinder is provided on the top of the cone plates, and a through hole is provided in the concave cylinder for fluid discharge. A heat exchange component is provided inside the branch pipe to push the cone plates to move and exchange heat with the molding groove;

[0008] The ejector rod is used to contact the PEEK plate to demold it from the molding groove, and the bottom of the molding groove is provided with a narrowed through groove for the ejector rod to pass through, and the narrowed through groove is conical in structure and adapted to the cone plate. The bottom of the ejector rod is provided with a control component adapted to the concave cylinder to control whether the fluid is discharged.

[0009] Preferably, the heat exchange component includes a buoyancy ball arranged inside the branch pipe, and gas is stored inside the buoyancy ball. The top of the buoyancy ball is fixedly connected to a movable rod fixedly connected to the cone plate, and the top of the branch pipe is fixedly connected to a top tube for the movable rod to be slidably connected, wherein fluid injection drives the buoyancy ball to move upward, driving the cone plate and the inner wall of the narrowed groove to form a closed heat exchange interface.

[0010] Preferably, the movable rod is communicated with the interior of the cone plate, and a through hole is provided at the bottom of the movable rod for the fluid in the branch pipe to enter.

[0011] Preferably, the control component includes a piston plate fixedly connected to the bottom of the push rod, and the piston plate and the concave cylinder are fixedly connected by a memory alloy spring. The memory alloy spring has a rigid tensile force that exceeds that at normal temperature when it is in the environment of 100°C in the lower mold. The piston plate and the concave cylinder are adapted to form a seal, and the inner wall of the narrowed through groove is rotatably connected to a connecting movable frame for supporting the push rod.

[0012] Preferably, the base layer of the mandrel is composed of an alloy having high-temperature rigidity, and the surface structure is wrapped with memory alloy wire and then covered with porous ceramics.

[0013] Preferably, it also includes a plurality of serpentine air ducts arranged on the inner wall of the molding groove, and a condenser for cooling the fluid is fixed inside the plurality of serpentine air ducts, a cavity for storing the branch pipe is opened inside the lower mold, and an air collection groove is opened on one side of the cavity for gas to enter the serpentine air duct.

[0014] Preferably, the bottom of the branch pipe is connected to a drain pipe, and the drain pipe passes through the lower mold, and the interior of the drain pipe is fixedly connected to a valve for controlling the flow of fluid therein.

[0015] Preferably, the interior of the lower mold is provided with an inlet groove connected to the branch pipe, the interior of the upper mold is provided with a water inlet pipe for fluid to enter, the bottom of the water inlet pipe is connected to a connecting nozzle adapted to the inlet groove, and a pressure gauge for detecting the pressure in the inlet groove is fixedly connected to one side of the lower mold.

[0016] Preferably, it also includes a positioning rod for conveying molten PEEK through the upper mold into the molding groove.

[0017] The present invention also provides a demoulding method for producing a PEEK board, comprising the following steps:

[0018] S1: Inject molten PEEK at 330-380℃ into the molding groove of the closed mold and cool under pressure;

[0019] S2: Coolant is injected into the branch pipe, and the heat exchange component operates to exchange heat with PEEK until the temperature reaches 230°C;

[0020] S3: The boiling steam drives the control component to operate so that the ejector pin ejects the workpiece at a uniform speed;

[0021] S4: Empty the liquid in the branch pipe and inject gas to be discharged through the concave cylinder to form an anti-locking air film.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The channel tube allows fluid to flow through, and the multiple cone plates at its top exchange heat with the heat source to heat the internal fluid. When liquid is introduced, they work with the heat exchange component to push the cone plates upward to contact the molding groove. The large temperature difference between the molten PEEK and the liquid is utilized to achieve rapid cooling and shaping, reducing the instantaneous cooling of the PEEK material, avoiding internal stress concentration and product deformation, and improving energy efficiency. The buoyancy ball stores air. After the upper and lower molds are closed, room-temperature liquid enters the channel tube to lift the buoyancy ball, driving the cone plates to contact the inner wall of the narrowing channel through a movable rod. Utilizing buoyancy drive, the structure is simple and reliable, eliminating the need for complex mechanical transmission, reducing cost and maintenance. The cone plates can be automatically adjusted according to the liquid volume, precisely controlling the heat exchange process. Multiple push rods are arranged along the array and, in conjunction with the control component, simultaneously protrude from the top of the narrowing channel. This ensures uniform force on the PEEK plate during demolding, preventing deformation and damage caused by excessive local force. In the control assembly, the piston plate and the concave barrel are adapted and sealed. Steam generated by the boiling liquid in the channel tube pushes the piston plate upward, causing the ejector rod to move slowly. The thrust gradually increases according to the change in steam pressure, overcoming the clamping force between the PEEK and the mold groove and reducing damage to both. After 230°C, during the cooling stage, gas is introduced into the channel tube. The gas enters the cone plate through the through-hole and is discharged through the perforations and narrowing grooves in the concave barrel to cool the PEEK in the mold groove. The continuous flow of gas forms an air film covering the bottom of the mold groove, preventing the PEEK from clinging to the groove again, ensuring smooth demolding and product quality. This meets the requirements of the PEEK material at different cooling stages and improves demolding and surface quality.

[0024] 2. A serpentine air duct is designed within the inner wall of the molding groove. As air passes through it, it directly absorbs heat from the sides of the PEEK sheet. Compared to traditional single cooling methods, this structure increases the contact area and contact time between the air and the sides of the PEEK sheet, greatly improving side cooling efficiency and enabling faster cooling of the PEEK sheet during the molding process. A condenser tube is fixed within the serpentine air duct to cool the air entering the duct. The cooled gas temperature is lower, and the temperature difference with the side of the PEEK plate is greater. According to the principle of heat transfer, the greater the temperature difference, the faster the heat transfer rate. Therefore, it can absorb the heat from the side of the PEEK plate more quickly, further accelerating the cooling process. Multiple serpentine air ducts are evenly distributed on the inner wall of the molding groove, which can make the various parts of the side of the PEEK plate receive a more uniform cooling effect, avoiding dimensional deviation or stress concentration problems caused by local uneven cooling, and helping to improve the dimensional accuracy and quality stability of the product. The setting of the air collection groove allows the gas to smoothly flow into the interior of the multiple serpentine air ducts and realize the reasonable distribution of the gas, ensuring that each air duct has sufficient gas flow for cooling, ensuring the stable operation of the entire cooling system. The cavity opened in the lower mold is used to store the branch pipe. At the same time, the air collection groove is opened on one side of the cavity to connect with the serpentine air duct. This design makes full use of the internal space of the mold and realizes the integrated design of the cooling system without affecting the overall structural strength and other functions of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 Schematic diagram of the explosion structure of the lower mold, the upper mold and the material conveying pipe in the present invention;

[0027] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at point A in the middle;

[0028] Figure 4 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0029] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0030] Figure 6 For the present invention Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0031] Figure 7 Schematic diagram of the structure of the channel pipe in the present invention;

[0032] Figure 8 Schematic diagram of the structure of the gas collection tank in the present invention;

[0033] Figure 9 For the present invention Figure 8 A magnified schematic diagram of the structure at D in the middle;

[0034] Figure 10 Schematic diagram of the cross-sectional structure of the cavity in the present invention.

[0035] In the figure: 100, lower mold; 101, upper mold; 102, positioning rod; 103, feed pipe; 104, molding groove; 105, cavity; 200, branch pipe; 201, inlet trough; 202, water inlet pipe; 203, connecting nozzle; 204, pressure gauge; 205, drain pipe; 206, valve; 207, ejector cylinder; 208, movable rod; 209, buoyancy ball; 210, through hole; 211, cone plate; 300, ejector rod; 301, narrowing through groove; 302, connecting movable frame; 303, spiral pattern; 304, piston plate; 305, concave cylinder; 306, memory alloy spring; 400, serpentine air duct; 401, condenser; 402, air collecting groove. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1 、 Figure 2 as well as Figure 4 The present invention provides a technical solution: a demolding device for PEEK board production, comprising a lower mold 100 and an upper mold 101 that are adapted to each other, and the inner wall of the lower mold 100 is provided with a molding groove 104 that matches the target molding surface of the PEEK board, and further comprising a positioning rod 102 for conveying molten PEEK through the upper mold 101 into the molding groove 104, and the top of the lower mold 100 is fixedly connected to the positioning rod 102 for sliding connection with the upper mold 101, and the positioning rod 102 can effectively guide the upper mold 101 so that a complete cavity is formed between it and the lower mold 100.

[0038] See also Figure 4 、 Figure 6 as well as Figure 7, and also includes a branch pipe 200, which is arranged inside the lower mold 100 and can allow fluid to pass through. A plurality of cone plates 211 are provided on the top of the branch pipe 200, and the cone plates 211 can exchange heat with a heat source to heat the fluid inside. A concave cylinder 305 is provided on the top of the cone plate 211, and a through hole is provided in the concave cylinder 305 for fluid discharge. A heat exchange component is provided inside the branch pipe 200 to push the cone plate 211 to move and exchange heat with the molding groove 104. The fluid can be liquid or gas. When the liquid is introduced, it can cooperate with the heat exchange component to push the cone plate 211 upward, and then contact with the molding groove 104 to achieve heat exchange, and the PEEK entering the molding groove 104 is cooled and shaped, so that it quickly reaches 230°C to form a fixed shape.

[0039] The molded product further includes a push rod 300, the base of which is composed of an alloy having high-temperature rigidity, and the surface structure is wrapped with memory alloy wire and covered with porous ceramic, which is used to resist the PEEK plate and allow it to be demolded from the molding groove 104, and the bottom of the molding groove 104 is provided with a narrowed through groove 301 for the push rod 300 to pass through, and the narrowed through groove 301 is constructed to be conical and adapted to the cone plate 211, and the bottom of the push rod 300 is provided with a control component adapted to the concave cylinder 305 to control whether the fluid is discharged, wherein the push rods 300 are arranged in a plurality along the array. With the cooperation of the control component, the plurality of push rods 300 operate synchronously and protrude from the top of the narrowed through groove 301, resisting the PEEK material to achieve demolding. At this time, the temperature of PEEK is around 230°C, and the clamping force between PEEK and the molding groove 104 is relatively low. The porous ceramic covered on the surface of the push rod 300 can reduce the rigidity resistance, thereby achieving the separation between PEEK and the molding groove 104.

[0040] Furthermore, the heat exchange component includes a buoyancy ball 209 arranged inside the branch pipe 200, and gas is stored inside the buoyancy ball 209. The top of the buoyancy ball 209 is fixedly connected to a movable rod 208 fixedly connected to the cone plate 211. The top of the branch pipe 200 is fixedly connected to a top cylinder 207 for sliding connection of the movable rod 208. The movable rod 208 and the interior of the cone plate 211 are communicated with each other, and the bottom of the movable rod 208 is provided with a through hole 210 for the fluid in the branch pipe 200 to enter. After the lower mold 100 and the upper mold 101 are closed to form a whole, the room temperature liquid is transported to the interior of the branch pipe 200 to raise the position of the buoyancy ball 209, so that the cone plate 211 conflicts with the inner wall of the narrowed through groove 301. The temperature of the molten PEEK is between 330-380°C, and the heat exchange component can cool it down to about 230°C for demolding. The heat exchange is carried out through the narrowed groove 301 and the cone plate 211. The separation by two layers of heat conduction parts can reduce the instantaneous cooling of the PEEK material. The adaptation of the cone plate 211 to the narrowed groove 301 can effectively increase the contact area and improve the heat exchange efficiency. The narrowed groove 301 allows the ejector pin 300 to protrude while preventing the molten PEEK from entering. After the liquid in the branch pipe 200 exchanges heat with the PEEK, its temperature reaches the boiling point and the PEEK temperature drops to about 230°C. This heat exchange work realizes energy utilization and also provides power for the movement of the ejector pin 300.

[0041] Among them, the bottom of the branch pipe 200 is connected to a drain pipe 205, and the drain pipe 205 passes through the lower mold 100. The interior of the drain pipe 205 is fixedly connected to a valve 206 for controlling the flow of the internal fluid. By setting the drain pipe 205, the heated liquid can be discharged for subsequent utilization.

[0042] Furthermore, an inlet groove 201 connected to the branch pipe 200 is provided inside the lower mold 100, and a water inlet pipe 202 for fluid to enter is provided inside the upper mold 101. The bottom of the water inlet pipe 202 is connected to a connecting nozzle 203 adapted to the inlet groove 201. A pressure gauge 204 for detecting the pressure in the inlet groove 201 is fixedly connected to one side of the lower mold 100. The connection nozzle 203 is placed inside the inlet groove 201 by closing the upper mold 101 and the lower mold 100. Then, liquid is transported to the inside of the water inlet pipe 202 so that it can enter the inside of the branch pipe 200. When the upper mold 101 is separated from the lower mold 100, the fluid can be directly transported into the inlet groove 201, and the pressure gauge 204 can detect the pressure value in the inlet groove 201, thereby judging whether the liquid transported into the inlet groove 201 meets the standard. Excessive liquid should not be transported into the inlet groove 201. When there is too much liquid, the push rod 300 will move prematurely.

[0043] Among them, the control component includes a piston plate 304 fixedly connected to the bottom of the ejector rod 300, and the piston plate 304 and the concave cylinder 305 are fixedly connected by a memory alloy spring 306. The memory alloy spring 306 has a rigid tensile force that exceeds that at room temperature when it is in the 100°C environment of the lower mold. The piston plate 304 and the concave cylinder 305 are adapted to form a seal. The inner wall of the narrowed through groove 301 is rotatably connected to a connecting movable frame 302 for supporting the ejector rod 300. Heat exchange is carried out between the liquid in the branch pipe 200 and the PEEK material in the molding groove 104. Subsequently, steam generated by the boiling of the liquid will be discharged through the concave cylinder 305 and will resist the piston plate 304 to move it upward. As the steam gathers, the thrust will continue to increase, causing the ejector rod 300 to move at a slow speed. Running at a slow speed can effectively reduce damage to PEEK.

[0044] It is worth mentioning that since the temperature of the molten PEEK is between 330-380°C, and the demolding work is at around 230°C, the final cooling and shaping is carried out after the demolding is completed. In the process of dropping the temperature from 330-380°C to 230°C, the liquid transported into the branch pipe 200 can effectively utilize the large temperature difference to achieve rapid cooling and utilization. As the liquid boils, the steam generated can gradually increase the thrust of the ejector pin 300, thereby gradually overcoming the clamping force between the PEEK and the molding groove 104, reducing unnecessary thrust operation and reducing damage to the molding groove 104. The cooling after 230°C will use gas as the medium. Introducing gas into the branch pipe 200 will not raise the position of the buoyancy ball 209. At this time, the gas is discharged through the concave cylinder 305 and passes through the spiral pattern 303 to form turbulence for cooling the molding groove 104 while forming an air film to prevent subsequent bonding. The tension of the memory alloy spring 306 is reduced at room temperature, causing the ejector pin 300 to vibrate under the influence of the airflow, thereby destroying the stress in the PEEK.

[0045] Specifically, by delivering cooling liquid into the water inlet pipe 202, the connecting nozzle 203 is connected to the inlet groove 201 to allow liquid to pass through and enter the interior of the branch pipe 200, and then gradually fill the interior of the branch pipe 200. Then the liquid lifts the buoyancy ball 209 and drives the cone plate 211 to move upward, so that its outer surface gradually fits the inner wall of the narrowed through groove 301, forming heat conduction. As the liquid is continuously injected, the liquid level also increases. The liquid will pass through multiple through holes 210 and enter the interior of the cone plate 211 and then fill its interior, and perform heat exchange with the PEEK in the molding groove 104 to cool it. At the same time, when the cone plate 211 moves upward and fits the inner wall of the narrowed through groove 301, the piston plate 304 will enter the interior of the concave cylinder 305 to form a seal. At this time, the liquid will not be discharged through the concave cylinder 305. As the heat exchange proceeds, the liquid continues to heat up and will gradually reach the boiling point. At this time, the 330-380℃ molten PEEK in the molding groove 104 will cool to about 230℃, and the boiling The liquid will generate steam that will continuously flow into the interior of the concave cylinder 305, thereby pushing the piston plate 304 upward. At this time, the position between the piston plate 304 and the concave cylinder 305 is limited so that the push rod 300 protrudes from the top of the narrowed through groove 301 and hits the PEEK for demoulding. Then, the valve 206 is opened to discharge the high-temperature liquid after heat exchange through the drain pipe 205, so that the fluid in the branch pipe 200 is emptied, and then gas is transported into the inlet groove 201. The gas enters the inner part of the cone plate 211 through the through hole 210. As the liquid in the branch pipe 200 is discharged, the buoyancy ball 209 is reset and the piston plate 304 is separated from the concave cylinder 305. After entering the cone plate 211, the gas is quickly discharged through the perforation in the concave cylinder 305, and is discharged into the interior of the molding groove 104 through the narrowed through groove 301 to cool the PEEK. The gas is continuously transported to the interior of the molding groove 104 to form an air film and cover the bottom of the molding groove 104 to prevent the PEEK and the molding groove 104 from hugging each other again.

[0046] In summary, the interior of the channel tube 200 allows fluid to flow through. The multiple conical plates 211 at its top exchange heat with a heat source to heat the internal fluid. When liquid is introduced, they cooperate with the heat exchange assembly to push the conical plates 211 upward to contact the molding groove 104. This utilizes the large temperature difference between the molten PEEK and the liquid to achieve rapid cooling and finalization, reducing the instantaneous cooling of the PEEK material, avoiding internal stress concentration and product deformation, and improving energy efficiency. The buoyancy ball 209 stores air. After the upper and lower molds are closed, ambient temperature liquid enters the channel tube 200, raising the buoyancy ball 209 and, via the movable rod 208, driving the conical plates 211 to contact the inner wall of the narrowing channel 301. This buoyancy-driven design offers a simple and reliable structure, eliminating the need for complex mechanical transmission, reducing costs and maintenance. The position of the conical plates 211 can be automatically adjusted according to the amount of liquid, precisely controlling the heat exchange process. Multiple push rods 300 are arranged along the array and, in conjunction with the control assembly, simultaneously protrude from the top of the narrowing channel 301. This ensures uniform force on the PEEK sheet during demolding, preventing deformation and damage caused by excessive local force. In the control assembly, piston plate 304 and concave barrel 305 are sealed together. Steam generated by the boiling liquid in channel tube 200 pushes piston plate 304 upward, causing ejector pin 300 to slowly move. The thrust gradually increases according to the change in steam pressure, overcoming the clamping force between the PEEK and the mold groove 104 and reducing damage to both. During the cooling stage after 230°C, gas is introduced into channel tube 200. The gas enters the interior of cone plate 211 through through-hole 210 and then exits through perforations and narrowing groove 301 in concave barrel 305 to cool the PEEK inside mold groove 104. This continuous flow of gas forms an air film covering the bottom of mold groove 104, preventing the PEEK from re-adhering to the mold groove 104. This ensures smooth demolding and maintains product quality, meets the requirements of PEEK material at different cooling stages, and improves demolding and surface quality.

[0047] Example 2: Please refer to Figures 8-10 The present invention also provides a technical solution, which is different from the technical solution of embodiment 1: a demolding device for PEEK board production, further comprising a plurality of serpentine air ducts 400 arranged on the inner wall of the molding groove 104, and a condenser 401 for cooling the fluid is fixed inside the plurality of serpentine air ducts 400, a cavity 105 for storing the branch pipe 200 is opened inside the lower mold 100, and a gas collection groove 402 for gas to enter the serpentine air duct 400 is opened on one side of the cavity 105, and the serpentine air duct 400 is located on the side of the molding groove 104, which can absorb the heat of the PEEK side when the gas passes through, and the condenser 401 can cool the gas to accelerate the absorption of the heat of the PEEK side, and the gas collection groove 402 can be used for the serpentine air duct 400 to converge.

[0048] Specifically, the continuous influx of gas will cause part of the gas to enter the interior of the multiple serpentine air ducts 400 through the gas collection grooves 402. The gas in the serpentine air ducts 400 contacts the condenser tubes 401 and is cooled, thereby effectively cooling both sides of the PEEK. At this time, the cooling rate of the surface layer of the PEEK is faster than that of its center, causing the surface material to solidify first, forming a rigid shell, which limits the flow space of the internal material.

[0049] In summary, the serpentine air duct 400, positioned within the inner wall of the molding groove 104, directly absorbs heat from the sides of the PEEK sheet as the air passes through it. Compared to traditional single cooling methods, this structure increases the contact area and contact time between the air and the sides of the PEEK sheet, significantly improving the side cooling efficiency and enabling faster cooling of the PEEK sheet during the molding process. The condenser tube 401, secured within the serpentine air duct 400, cools the air entering the duct. The cooled gas temperature is lower, and the temperature difference with the side of the PEEK plate is greater. According to the principle of heat transfer, the greater the temperature difference, the faster the heat transfer rate. Therefore, the heat from the side of the PEEK plate is absorbed more quickly, further accelerating the cooling process. Multiple serpentine air ducts 400 are evenly distributed on the inner wall of the molding groove 104, ensuring that all parts of the PEEK plate side are cooled more evenly, avoiding dimensional deviation or stress concentration caused by localized uneven cooling, and helping to improve the dimensional accuracy and quality stability of the product. The provision of the gas collection groove 402 allows the gas to smoothly flow into the multiple serpentine air ducts 400 and achieves reasonable gas distribution, ensuring sufficient gas flow in each air duct for cooling, and ensuring stable operation of the entire cooling system. The cavity 105 defined within the lower mold 100 is used to store the branch pipe 200. At the same time, the gas collection groove 402 is provided on one side of the cavity to connect to the serpentine air duct 400. This design fully utilizes the internal space of the mold and realizes an integrated design of the cooling system without affecting the overall structural strength and other functions of the mold.

[0050] Example 3: Please refer to Figures 1-10 The present invention also provides a technical solution, which is different from the technical solution of embodiment 1: a demoulding method for producing PEEK boards, comprising the following steps:

[0051] S1. When in use, first close the upper mold 101 and the lower mold 100, apply high pressure to 330-380°C molten PEEK and inject it into the molding groove 104 in the lower mold 100 through the feeding pipe 103, and maintain the pressure to allow it to be shaped and cooled;

[0052] S2. Cooling liquid is delivered to the water inlet pipe 202. At this time, the connecting nozzle 203 is connected to the inlet groove 201, allowing the liquid to pass through and enter the interior of the branch pipe 200, and then gradually fill the interior of the branch pipe 200. The liquid then lifts the buoyancy ball 209 and drives the cone plate 211 to move upward, so that its outer surface gradually fits the inner wall of the narrowing groove 301, forming heat conduction. As the liquid is continuously injected, the liquid level also increases. The liquid will pass through the multiple through holes 210 and enter the interior of the cone plate 211, then fill the interior, and exchange heat with the PEEK in the molded groove 104 to cool it. At the same time, when the cone plate 211 moves upward and fits the inner wall of the narrowing groove 301, the piston plate 304 will enter the interior of the concave cylinder 305, forming a seal. At this time, the liquid will not be discharged through the concave cylinder 305;

[0053] S3. As the heat exchange progresses, the liquid temperature gradually rises and reaches the boiling point. At this time, the molten PEEK in the molding groove 104 at 330-380°C cools to about 230°C. The boiling liquid generates steam that continuously flows into the interior of the concave cylinder 305, thereby pushing the piston plate 304 upward. At this time, the position between the piston plate 304 and the concave cylinder 305 is limited so that the ejector pin 300 protrudes from the top of the narrowed through groove 301 and contacts the PEEK for demolding.

[0054] S4, then open the valve 206 to drain the high-temperature liquid after heat exchange through the drainage pipe 205, so that the fluid in the branch pipe 200 is emptied, and then the gas is transported into the inlet groove 201. The gas enters the interior of the cone plate 211 through the through hole 210. As the liquid in the branch pipe 200 is discharged, the buoyancy ball 209 is reset and the piston plate 304 is separated from the concave cylinder 305. After entering the cone plate 211, the gas is quickly discharged through the perforation in the concave cylinder 305, and is discharged through the narrowed through groove 301 to the interior of the molding groove 104 to cool the PEEK. The gas is continuously The gas delivered to the interior of the molding groove 104 can form an air film that covers the bottom of the molding groove 104 and prevents the PEEK from clinging to the molding groove 104 again. The continuous influx of gas will cause part of the gas to enter the interior of the multiple serpentine air ducts 400 through the gas collection groove 402. The gas in the serpentine air duct 400 contacts the condenser tube 401 and is cooled, effectively cooling both sides of the PEEK. At this time, the cooling rate of the surface layer of the PEEK is faster than that of its center, causing the surface material to solidify first, forming a rigid shell, which limits the flow space of the internal material.

[0055] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A demoulding device for producing a PEEK plate, comprising a lower mold (100) and an upper mold (101) adapted to each other, wherein the inner wall of the lower mold (100) is provided with a molding groove (104) matching the target molding surface of the PEEK plate, characterized in that: Also includes: A branch pipe (200) is provided inside the lower mold (100) and allows fluid to pass through. A plurality of cone plates (211) are provided on the top of the branch pipe (200), and the cone plates (211) can exchange heat with a heat source to heat the fluid inside the branch pipe. A concave cylinder (305) is provided on the top of the cone plate (211), and a through hole is provided in the concave cylinder (305) for fluid discharge. A heat exchange component is provided inside the branch pipe (200) to push the cone plates (211) to move and exchange heat with the molding groove (104). A push rod (300) is used to contact the PEEK plate to facilitate demoulding of the PEEK plate from the molding groove (104), and a narrowed through groove (301) is provided at the bottom of the molding groove (104) for the push rod (300) to pass through, and the narrowed through groove (301) is configured to be conical and compatible with the cone plate (211), and a control component is provided at the bottom of the push rod (300) to be compatible with the concave cylinder (305) and to control whether the fluid is discharged; The heat exchange assembly includes a buoyancy ball (209) disposed inside the branch pipe (200), and gas is stored inside the buoyancy ball (209), the top of the buoyancy ball (209) is fixedly connected to a movable rod (208) fixedly connected to the cone plate (211), and the top of the branch pipe (200) is fixedly connected to a top cylinder (207) for sliding connection to the movable rod (208), wherein fluid injection drives the buoyancy ball (209) to move upward, driving the cone plate (211) and the inner wall of the narrowed through groove (301) to form a closed heat exchange interface; The movable rod (208) and the interior of the cone plate (211) are in communication with each other, and a through hole (210) is provided at the bottom of the movable rod (208) for the fluid in the branch pipe (200) to enter; The base of the push rod (300) is composed of an alloy with high-temperature rigidity, and the surface structure is wrapped with memory alloy wire and then covered with porous ceramics; The mold further comprises a plurality of serpentine air ducts (400) arranged on the inner wall of the molding groove (104), and a condenser tube (401) for cooling the fluid is fixed inside the plurality of serpentine air ducts (400), a cavity (105) for storing the branch tube (200) is provided inside the lower mold (100), and a gas collection groove (402) for gas to enter the serpentine air duct (400) is provided on one side of the cavity (105).

2. A demoulding device for producing PEEK boards according to claim 1, characterized in that: The control assembly includes a piston plate (304) fixedly connected to the bottom of the ejector rod (300), and the piston plate (304) and the concave cylinder (305) are fixedly connected via a memory alloy spring (306). The memory alloy spring (306) has a rigid tensile force exceeding that at room temperature when placed in a 100°C environment of the lower mold. The piston plate (304) and the concave cylinder (305) are adapted to form a seal. The inner wall of the narrowed through groove (301) is rotatably connected to a connecting movable frame (302) for supporting the ejector rod (300).

3. The demoulding device for producing PEEK boards according to claim 1, characterized in that: The bottom of the branch pipe (200) is connected to a drainage pipe (205), and the drainage pipe (205) passes through the lower mold (100). The interior of the drainage pipe (205) is fixedly connected to a valve (206) for controlling the flow of fluid therein.

4. The demoulding device for producing PEEK boards according to claim 1, characterized in that: The lower mold (100) is provided with an inlet groove (201) in communication with the branch pipe (200), the upper mold (101) is provided with a water inlet pipe (202) for fluid entry, the bottom of the water inlet pipe (202) is connected to a connecting nozzle (203) adapted to the inlet groove (201), and a pressure gauge (204) for detecting the pressure in the inlet groove (201) is fixedly connected to one side of the lower mold (100).

5. The demoulding device for producing PEEK boards according to claim 1, characterized in that: It also includes a positioning rod (102) for conveying molten PEEK through the upper mold (101) into the molding groove (104).

6. A demoulding method for PEEK board production, according to a demoulding device for PEEK board production according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: injecting molten PEEK at 330-380°C into the molding groove (104) of the closed mold, and cooling under pressure; S2: Coolant is injected into the branch pipe (200), and the heat exchange component operates to exchange heat with PEEK to 230°C; S3: The boiling steam drives the control component to operate so that the ejector rod (300) ejects the workpiece at a uniform speed; S4: Empty the liquid in the branch pipe (200), and inject gas to be discharged through the concave cylinder (305) to form an anti-locking air film.

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