PEEK prepreg molding apparatus and molding method thereof

Abstract

The present application relates to the technical field of composite material forming, and particularly relates to a PEEK prepreg forming device and a forming method thereof, which comprises an eight-column hydraulic press, a cold-heat integrated unit, an operation cabinet, an outer working frame assembly and a power distribution cabinet; the eight-column hydraulic press comprises an upper cross beam, a lower cross beam, a column connected between the upper cross beam and the lower cross beam, a movable cross beam moving up and down along the column, a main cylinder driving the movable cross beam, a driving oil cylinder and an ejection mechanism arranged on the lower cross beam, and the cold-heat integrated unit is configured to be driven by the driving oil cylinder to move between a mold closing station of the eight-column hydraulic press and an external material laying station; the present application provides a set of efficient, precise, reliable and intelligent PEEK prepreg forming overall solution through the hardware innovation of the "movable cold-heat integrated unit and conical surface positioning" combined with the system innovation of the "multi-section quantitative process and self-adaptive pressure / speed control", and realizes the core purpose of greatly improving the production efficiency and process stability under the premise of guaranteeing and improving the quality of high-end PEEK composite material products.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, and in particular to a PEEK prepreg molding equipment and molding method. Background Technology

[0002] Polyetheretherketone (PEEK), a semi-crystalline thermoplastic engineering plastic, possesses excellent high-temperature resistance, mechanical properties, chemical corrosion resistance, and flame retardancy. PEEK composites reinforced with materials such as carbon fiber have important applications in aerospace, high-end medical devices, and precision industrial components. These materials are typically molded using a compression molding process, where PEEK prepreg (such as carbon fiber / PEEK prepreg tape) is laid in a mold, melted, flowed, impregnated with fibers, and finally cooled and solidified under high temperature and pressure.

[0003] However, the molding of PEEK materials places extremely stringent requirements on process conditions. Its melting point is as high as 343℃, and the optimal melt processing temperature is typically in the ultra-high temperature range of 370-390℃. At this temperature, traditional oil-heated mold temperature controllers cannot operate stably due to the easy cracking and carbonization of the heat transfer oil; therefore, electric heating must be used. However, at such high temperatures, conventional electric heating plates are limited by the layout of heating elements, heat loss, and heat equalization capacity, resulting in poor temperature uniformity on the working surface, generally only maintaining a range of ±10℃. The melt viscosity of PEEK resin is extremely sensitive to temperature changes; even slight unevenness in mold temperature can lead to inconsistent resin flow, resulting in defects such as porosity, poor fiber wetting, localized performance degradation, and even delamination within the product, severely impacting product quality and yield.

[0004] On the other hand, PEEK has a narrow molding process window. At excessively low temperatures, the resin has poor fluidity, failing to adequately wet the reinforcing fibers; while temperatures exceeding its thermal degradation initiation temperature (approximately 420°C) will cause resin decomposition, impairing the mechanical properties of the final product. Simultaneously, the crystallization behavior of PEEK during cooling has a decisive impact on the dimensional stability and final performance of the product, requiring a precisely controlled gradient cooling process to manage the crystallization process and reduce internal stress. In existing technologies, the cooling systems of molding equipment are mostly designed as simple water cooling, making it difficult to achieve rapid and controllable gradient cooling, which easily leads to product warping and deformation.

[0005] Furthermore, to improve production efficiency, some equipment employs a removable heated worktable design. However, ensuring extremely high and stable repeatability of the positioning accuracy between the mold (or heating plate unit) and the press's moving crossbeam during mold closing is a problem that urgently needs to be solved. Conventional limit switches or mechanical stops have limited accuracy and cannot meet the stringent dimensional consistency requirements of high-performance composite materials like PEEK.

[0006] In summary, the existing technology lacks a dedicated equipment and supporting process that can achieve highly uniform heating and precise gradient cooling at ultra-high temperatures and has high-precision positioning capabilities to meet the needs of producing high-quality, highly stable PEEK composite material products. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art, and to propose a PEEK prepreg molding hydraulic press and its molding method.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a PEEK prepreg molding equipment, comprising an eight-column hydraulic press, a heating and cooling integrated unit, an operating cabinet, an external work frame assembly, and a power distribution cabinet; the eight-column hydraulic press includes an upper crossbeam, a lower crossbeam, a column connecting the upper and lower crossbeams, a movable crossbeam that moves up and down along the column, and a main cylinder for driving the movable crossbeam; a driving cylinder and an ejection mechanism are provided on the movable crossbeam; the heating and cooling integrated unit is configured to be driven by the driving cylinder to move between the mold closing station and the external material laying station of the eight-column hydraulic press; the external work frame is assembled and disposed on the outside of the eight-column hydraulic press, for guiding and supporting the heating and cooling integrated unit when it moves to the external material laying station; A lower positioning block is provided above the movable crossbeam, and an upper positioning ring is provided below the integrated heating and cooling unit. When the movable crossbeam rises, the lower positioning block and the upper positioning ring engage with each other through a conical surface to achieve precise positioning between the integrated heating and cooling unit and the movable crossbeam.

[0009] Furthermore, the integrated heating and cooling unit includes at least the following components from top to bottom: Cold plate, the top working surface of which is used to support the mold or prepreg, and the interior is provided with cooling channels; The heat transfer unit is made of a highly oriented thermally conductive material, whose thermal conductivity in the horizontal direction is greater than that in the vertical direction. The heating unit has a built-in electric heating element with multiple independently controlled zones; Insulation layer; The water-cooled plate located below the insulation layer and the movable platform below the water-cooled plate are also provided. The two ends of the cold plate, the heating unit, the insulation layer, the water-cooled plate and the movable platform are respectively straight and "L" shaped. The same upper positioning ring is provided at the intersection of the longitudinal side and the transverse side of the "L" shaped movable platform.

[0010] Furthermore, the heat transfer unit is a graphite plate, whose thermal conductivity in the horizontal direction is more than N times that in the vertical direction, where N ranges from 2 to 5.

[0011] Furthermore, the heating unit has a built-in three-section electric heating rod.

[0012] Furthermore, the outer work frame is equipped with a work frame, and multiple horizontal guide wheels and side guide wheels are symmetrically arranged on the left and right sides of the upper end of the work frame to guide the moving integrated heating and cooling unit horizontally and laterally, preventing it from deviating from its direction.

[0013] Furthermore, the integrated heating and cooling unit also includes a cooling system connected to the cooling channel of the cold plate. The cooling system is configured to: in the gradient cooling stage, firstly introduce compressed gas into the cooling channel for the first stage of cooling; and when the temperature drops to a set temperature value, switch to introducing circulating water into the water-cooled plate for the second stage of cooling.

[0014] A molding method based on the PEEK prepreg molding equipment described above includes the following steps: S1. Loading: Move the integrated heating and cooling unit to the external material laying station, lay PEEK prepreg on its working surface, and then move it to the mold closing station. S2, Positioning and Mold Closure: Control the moving crossbeam to rise, and complete the precise positioning by the cooperation of the lower positioning block and the upper positioning ring with the conical surface. Continue to close the mold until the mold closing pressure reaches the first preset mold closing pressure P0 and then hold the pressure. S3, Multi-stage heating molding: The molding cycle is executed according to a preset program, including a preheating stage, a melt wetting stage, a heat holding and solidification stage, and a gradient cooling stage; the holding time of each stage is related to the designed thickness H (in mm) of the product. S4. Demolding and material removal: Wait for the mold temperature to cool to the demolding temperature T. e Then, the mold is opened and the integrated heating and cooling unit is removed to take out the product.

[0015] Furthermore, the multi-segment heating and forming in step S3 specifically includes: Preheating stage: Control the mold temperature T1 at 320~340℃, apply pressure P1 at 0.2~0.5MPa, and hold pressure time t1 satisfy: t1=α1 × H, where α1 is the preheating time coefficient, with a value range of 2.8~3.2min / mm, H is the designed thickness of the product, and the mold temperature uniformity ΔT1 is controlled within ±3℃; Melt wetting stage: control the mold temperature to rise to T2 of 360~380℃, apply pressure P2 of 2~5MPa, and hold pressure time t2 satisfy: t2 = β × t1 + γ, where β is the correlation coefficient, with a value range of 3.0~5.0, γ is the base time compensation, with a value range of 5~15min, and the overall temperature uniformity of the mold ΔT2 is controlled within ±3℃; During the heat preservation and consolidation stage: control the mold temperature T3 = T2 - ΔT s , where ΔT s For consolidation cooling, the value range is 5~10℃, the pressure is maintained at P3=P2, and the holding time t3 satisfies: t3 = t2×(1 + k ×ΔT) s / T2), where k is the material sensitivity coefficient, with a value range of 0.05~0.15, and the overall temperature uniformity of the mold ΔT3 is controlled within ±3℃; The gradient cooling stage includes: The first stage: The mold temperature T3 in the heat preservation and solidification stage is reduced to the crystallization temperature range T4 of PEEK (300~320℃) at the first rate R1 of 0.5~2℃ / min, and then held at the temperature for t4. The holding time t4 satisfies: t4 = λ×H +φ, where λ is in min / mm and φ is the compensation time (min). Second stage: Cool down at a second rate R2 of 5~10℃ / min to an intermediate temperature t5 of 150~200℃; Third stage: Natural cooling or cooling to room temperature at a third rate R3 not exceeding 15℃ / min; In the first stage and the initial stage of the second stage, when the temperature is higher than T5, the pressure P4 is maintained at 0.5~1MPa. The pressure is released after the mold temperature drops below T5.

[0016] Further, in step S2, the moved-in integrated heating and cooling unit is coarsely positioned by a limit switch, and then precisely positioned by the engagement of the lower positioning block and the conical surface of the upper positioning ring; the setting of the first preset mold closing pressure P0 is related to the target molding pressure P2 and the repeatability positioning accuracy δ, satisfying the relationship: P0 = P2 × (1 - η × δ), where η is a dimensionless sensitivity coefficient, with a value range of 2~10, and |δ| ≤ ±0.05 mm.

[0017] Furthermore, the demolding and material removal in step S4 specifically involves controlling the movable crossbeam to slowly move upwards to complete the upper mold release. During demolding, the upward speed v satisfies: v = ω × (T) e - T a ) / T e Where ω is the velocity constant, ranging from 1.0 to 2.0 mm·℃ / min, and T e T is the set demolding temperature. a This refers to the real-time temperature of the mold, and T a ≤ T e When T a = T e At time T, v=0; as T... a Decrease, (T) e- T a As the temperature rises, v increases proportionally; then the ejection mechanism rises to support the integrated hot and cold unit, and is then driven out by the drive cylinder (104). Finally, the product is removed manually by blowing air through the air holes set on the mold or cold plate.

[0018] Compared with existing technologies, the core advantages of this invention are: This invention combines hardware innovations such as "movable integrated heating and cooling unit + conical positioning" with software innovations such as "multi-segment quantitative process + adaptive pressure / speed control" to provide a highly efficient, precise, reliable and intelligent overall solution for PEEK prepreg molding. Ultimately, it achieves the core objective of significantly improving production efficiency and process stability while ensuring and improving the quality of high-end PEEK composite material products. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a PEEK prepreg molding device according to the present invention; Figure 2 This is a three-dimensional structural diagram of the eight-column hydraulic press of the present invention; Figure 3 This is a three-dimensional structural diagram of the outer work frame assembly in this invention; Figure 4 This is a three-dimensional structural diagram of the integrated heating and cooling unit in this invention; In the diagram: 1-Eight-column hydraulic press; 101-Moving crossbeam; 102-Ejection mechanism; 103-Lower positioning block; 104-Drive cylinder; 105-Lower crossbeam; 106-Upper crossbeam; 107-Column; 108-Main cylinder; 2-Integrated cooling and heating unit; 201-Cold plate; 202-Heat transfer unit; 203-Heating unit; 204-Insulation layer; 205-Water-cooled plate; 206-Moving platform; 207-Upper positioning ring; 3-Operating cabinet; 4-Outer work frame assembly; 401-Work frame; 402-Horizontal guide wheel; 403-Side guide wheel; 6-Power distribution cabinet. Detailed Implementation

[0020] 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.

[0021] Example 1, please refer to the accompanying drawings in the instruction manual. Figures 1-4As shown, a PEEK prepreg molding equipment includes an eight-column hydraulic press 1, a heating and cooling integrated unit 2, an operating cabinet 3, an external work frame assembly 4, and a power distribution cabinet 6. The eight-column hydraulic press 1 includes an upper crossbeam 106, a lower crossbeam 105, a column 107 connecting the upper crossbeam 106 and the lower crossbeam 105, a movable crossbeam 101 that moves up and down along the column 107, and a main cylinder 108 that drives the movable crossbeam 101. A drive cylinder 104 and an ejection mechanism 102 are provided on the lower crossbeam 105. The heating and cooling integrated unit 2 is configured to be driven by the drive cylinder 104 to move between the mold closing station and the external material laying station of the eight-column hydraulic press 1. The external work frame assembly 4 is located outside the eight-column hydraulic press 1 and is used to guide and support the heating and cooling integrated unit 2 when it moves to the external material laying station.

[0022] A lower positioning block 103 is provided below the movable crossbeam 101, and an upper positioning ring 207 is provided above the integrated heating and cooling unit 2. When the movable crossbeam 101 rises, the lower positioning block 103 and the upper positioning ring 207 cooperate through a conical surface to achieve precise positioning between the integrated heating and cooling unit 2 and the movable crossbeam 101, ensuring that the repeatability of the moving table support plate 206 and the movable crossbeam 101 is within ±0.05mm, thus ensuring the subsequent mold closing accuracy.

[0023] Example 2: The integrated cooling and heating unit 2, from top to bottom, includes at least: a cold plate 201, the top working surface of which is used to support the mold or prepreg, and a cooling channel is provided inside the cold plate 201; it also includes a cooling system connected to the cooling channel of the cold plate 201, the cooling system being configured to: in the cooling stage, firstly introduce compressed gas into the cooling channel for a first stage of cooling; when the temperature drops to a set threshold, switch to introducing circulating water into the water-cooled plate 205 for a second stage of cooling; the bottom of the cold plate 201 is a heat transfer unit 202, the heat transfer unit 202 being made of a highly directional thermally conductive material, whose horizontal thermal conductivity is greater than its vertical thermal conductivity; in this embodiment, the heat transfer unit 202 is a graphite plate, whose horizontal thermal conductivity is greater than its vertical thermal conductivity. More than N times, where N ranges from 2 to 5. In this embodiment, below the heat transfer unit 202 is the heating unit 203, which has a built-in electric heating element with independent control of multiple zones; below the heating unit 203 is the insulation layer 204; a three-section electric heating rod is built into the heating unit 203; it also includes a water-cooled plate 205 located below the insulation layer 204 and a movable platform 206 below the water-cooled plate 205; in this embodiment, the ends of the cold plate 201, the heating unit 203, the insulation layer 204, the water-cooled plate 205 and the movable platform 206 are respectively straight and "L" shaped, and upper positioning rings 207 with the same structure are respectively provided at the intersection of the longitudinal and transverse sides of the "L" shaped movable platform 206; in this embodiment, the insulation layer 204 is a mica insulation board.

[0024] Example 3: Based on Example 1 above, a work frame 401 is provided on the outer work frame assembly 4. Multiple horizontal guide wheels 402 and side guide wheels 403 are symmetrically arranged on the left and right sides of the upper end of the work frame 401 to guide the moving integrated heating and cooling unit 2 horizontally and laterally and prevent it from deviating.

[0025] Example 4, a molding method based on the PEEK prepreg molding equipment described in any one of the above, includes the following steps: S1. Loading: Move the integrated heating and cooling unit 2 to the external material laying station, lay PEEK prepreg on its working surface, and then move it to the mold closing station. In this embodiment, the external material laying station refers to the position where the integrated heating and cooling unit 2 is driven by the driving cylinder 104 to move out of the main body of the eight-column hydraulic press 1 and is supported and guided by the outer work frame assembly 4. The mold closing station refers to the inside of the eight-column hydraulic press 1, directly below the movable crossbeam 101.

[0026] S2, Positioning and Mold Closure: Control the moving crossbeam 101 to rise, and complete the precise positioning by the tapered surface cooperation between the lower positioning block 103 and the upper positioning ring 207. Continue to close the mold until the mold closing pressure reaches the first preset mold closing pressure P0 and then hold the pressure. S3, Multi-stage heating molding: The molding cycle is executed according to a preset program, including a preheating stage, a melt wetting stage, a heat holding and solidification stage, and a gradient cooling stage; the holding time of each stage is related to the designed thickness H (in mm) of the product. S4. Demolding and material removal: Wait for the mold temperature to cool to the demolding temperature T. e Then, the mold is opened and the integrated heating and cooling unit 2 is removed to take out the product.

[0027] Example 5, based on Example 4 above, the multi-segment heating and forming in step S3 specifically includes: Preheating stage: Control the mold temperature T1 at 320~340℃, apply pressure P1 at 0.2~0.5MPa, and hold pressure time t1 satisfy: t1=α1 × H, where α1 is the preheating time coefficient, with a value range of 2.8~3.2min / mm, H is the designed thickness of the product, and the mold temperature uniformity ΔT1 is controlled within ±3℃; Melt wetting stage: control the mold temperature to rise to T2 of 360~380℃, apply pressure P2 of 2~5MPa, and hold pressure time t2 satisfy: t2 = β × t1 + γ, where β is the correlation coefficient, with a value range of 3.0~5.0, γ is the base time compensation, with a value range of 5~15min, and the overall temperature uniformity of the mold ΔT2 is controlled within ±3℃; During the heat preservation and consolidation stage: control the mold temperature T3 = T2 - ΔT s , where ΔT s For consolidation cooling, the value range is 5~10℃, the pressure is maintained at P3 = P2, and the holding time t3 satisfies: t3 = t2×(1+ k×ΔT) s / T2), where k is the material sensitivity coefficient, with a value range of 0.05~0.15, and the overall temperature uniformity of the mold ΔT3 is controlled within ±3℃; The gradient cooling stage includes: First stage: The mold temperature T3 in the heat preservation and solidification stage is reduced to the crystallization temperature range T4 of PEEK (300~320℃) at the first rate R1 of 0.5~2℃ / min, and held at the temperature for t4. The holding time t4 satisfies: t4 = λ×H +φ, where λ is in min / mm and φ is the compensation time (min). Second stage: Cool down at a second rate R2 of 5~10℃ / min to an intermediate temperature t5 of 150~200℃; Third stage: Natural cooling or cooling to room temperature at a third rate R3 not exceeding 15℃ / min; In the first stage and the initial stage of the second stage, when the temperature is higher than T5, the pressure P4 is maintained at 0.5~1MPa. The pressure is released after the mold temperature drops below T5.

[0028] Example 6: Based on Example 4 above, in step S2, the moved-in integrated heating and cooling unit 2 is coarsely positioned by a limit switch, and then precisely positioned by the conical surface mating; the setting of the first preset mold closing pressure P0 is related to the target molding pressure P2 and the repeatability δ of the positioning system, satisfying the relationship: P0 = P2 × (1 - η × δ), where η is a dimensionless sensitivity coefficient, with a value range of 2~10, and |δ| ≤ ±0.05 mm.

[0029] Example 7, continuing from Example 4 above, the demolding and material removal in step S4 specifically involves: controlling the movable beam 101 to slowly move upwards to complete the upper mold release, with the upward speed v satisfying: v = ω×(T) e - T a ) / T e Where ω is the velocity constant, ranging from 1.0 to 2.0 mm·℃ / min, and T e T is the set demolding temperature. a This refers to the real-time temperature of the mold, and T a ≤ T e When T a = T e At time T, v=0; as T... a Decrease, (T) e - T a As the temperature rises, v increases proportionally; then the ejection mechanism 102 rises to support the integrated heating and cooling unit 2, and is then driven out by the driving cylinder 104. Finally, air is blown through the air holes set on the mold or cold plate 202 to assist in demolding, and the product is manually removed.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A PEEK prepreg molding equipment, comprising an eight-column hydraulic press (1), a heating and cooling integrated unit (2), an operating cabinet (3), an external work frame assembly (4), and a power distribution cabinet (6); the eight-column hydraulic press (1) includes an upper crossbeam (106), a lower crossbeam (105), a column (107) connecting the upper crossbeam (106) and the lower crossbeam (105), a movable crossbeam (101) moving up and down along the column (107), and a main cylinder (108) driving the movable crossbeam (101), characterized in that: A drive cylinder (104) and an ejection mechanism (102) are provided on the movable crossbeam (101). The integrated heating and cooling unit (2) is configured to be driven by the drive cylinder (104) to move between the mold closing station and the external material laying station of the eight-column hydraulic press (1). The outer work frame assembly (4) is located on the outside of the eight-column hydraulic press (1) and is used to guide and support the integrated heating and cooling unit (2) when it moves to the external material laying station. A lower positioning block (103) is provided above the movable crossbeam (101), and an upper positioning ring (207) is provided below the integrated heating and cooling unit (2). When the movable crossbeam (101) rises, the lower positioning block (103) and the upper positioning ring (207) cooperate through a conical surface to achieve precise positioning between the integrated heating and cooling unit (2) and the movable crossbeam (101).

2. The PEEK prepreg molding equipment according to claim 1, characterized in that: The integrated heating and cooling unit (2) includes at least the following components from top to bottom: Cold plate (201), the top working surface of which is used to support the mold or prepreg, and a cooling channel is provided inside; The heat transfer unit (202) is made of a highly oriented thermally conductive material, whose thermal conductivity in the horizontal direction is greater than that in the vertical direction. The heating unit (203) has a built-in electric heating element with independent control of multiple zones; Insulation layer (204); And a water-cooled plate (205) located below the heat insulation layer (204) and a movable platform (206) below the water-cooled plate (205); the two ends of the cold plate (201), the heating unit (203), the heat insulation layer (204), the water-cooled plate (205) and the movable platform (206) are straight and "L" shaped respectively, and upper positioning rings (207) with the same structure are respectively provided at the intersection of the longitudinal and transverse sides of the "L" shape of the movable platform (206).

3. The PEEK prepreg molding equipment according to claim 2, characterized in that: The heat transfer unit (202) is a graphite plate, and its thermal conductivity in the horizontal direction is more than N times that in the vertical direction, where N ranges from 2 to 5.

4. The PEEK prepreg molding equipment according to claim 2, characterized in that: The heating unit (203) has a built-in three-section electric heating rod.

5. The PEEK prepreg molding equipment according to claim 1, characterized in that: The outer work frame assembly (4) is provided with a work frame (401). Multiple horizontal guide wheels (402) and side guide wheels (403) are symmetrically arranged on the left and right sides of the upper end of the work frame (401) to guide the moving integrated heating and cooling unit (2) horizontally and laterally and prevent it from deviating.

6. The PEEK prepreg molding equipment according to claim 2, characterized in that: The integrated heating and cooling unit (2) also includes a cooling system connected to the cooling channel of the cold plate (201). The cooling system is configured to: in the gradient cooling stage, firstly introduce compressed gas into the cooling channel for the first stage of cooling, and when the temperature drops to the set temperature value, switch to introducing circulating water into the water-cooled plate (205) for the second stage of cooling.

7. A molding method based on the PEEK prepreg molding equipment according to any one of claims 1-6, characterized in that, Includes the following steps: S1, Loading: Move the integrated heating and cooling unit (2) to the external material laying station, lay PEEK prepreg on its working surface, and then move it to the mold closing station; S2, Positioning and Mold Closure: Control the moving crossbeam (101) to rise, and complete the precise positioning by the conical surface cooperation between the lower positioning block (103) and the upper positioning ring (207). Continue to close the mold until the mold closing pressure reaches the first preset mold closing pressure P0 and then hold the pressure. S3, Multi-stage heating molding: The molding cycle is executed according to a preset program, including a preheating stage, a melt wetting stage, a heat holding and solidification stage, and a gradient cooling stage; the holding time of each stage is related to the designed thickness H (in mm) of the product. S4. Demolding and material removal: Wait for the mold temperature to cool to the demolding temperature T. e Then, the mold is opened and the integrated heating and cooling unit (2) is removed to take out the product.

8. The molding method of a PEEK prepreg molding equipment according to claim 7, characterized in that, The multi-segment heating and forming process in step S3 specifically includes: Preheating stage: Control the mold temperature T1 at 320~340℃, apply pressure P1 at 0.2~0.5MPa, and hold pressure time t1 satisfy: t1=α1 × H, where α1 is the preheating time coefficient, with a value range of 2.8~3.2min / mm, H is the designed thickness of the product, and the mold temperature uniformity ΔT1 is controlled within ±3℃; Melt wetting stage: control the mold temperature to rise to T2 of 360~380℃, apply pressure P2 of 2~5MPa, and hold pressure time t2 satisfy: t2 = β × t1 + γ, where β is the correlation coefficient, with a value range of 3.0~5.0, γ is the base time compensation, with a value range of 5~15min, and the overall temperature uniformity of the mold ΔT2 is controlled within ±3℃; During the heat preservation and consolidation stage: control the mold temperature T3 = T2 - ΔT s , where ΔT s For consolidation cooling, the value range is 5~10℃, the pressure is maintained at P3=P2, and the holding time t3 satisfies: t3 = t2×(1 + k ×ΔT) s / T2), where k is the material sensitivity coefficient, with a value range of 0.05~0.15, and the overall temperature uniformity of the mold ΔT3 is controlled within ±3℃; The gradient cooling stage includes: The first stage: The mold temperature T3 in the heat preservation and solidification stage is reduced to the crystallization temperature range T4 of PEEK (300~320℃) at the first rate R1 of 0.5~2℃ / min, and then held at the temperature for t4. The holding time t4 satisfies: t4 = λ×H +φ, where λ is in min / mm and φ is the compensation time (min). Second stage: Cool down at a second rate R2 of 5~10℃ / min to an intermediate temperature t5 of 150~200℃; Third stage: Natural cooling or cooling to room temperature at a third rate R3 not exceeding 15℃ / min; In the first stage and the initial stage of the second stage, when the temperature is higher than T5, the pressure P4 is maintained at 0.5~1MPa. The pressure is released after the mold temperature drops below T5.

9. The molding method of a PEEK prepreg molding equipment according to claim 8, characterized in that, In step S2, the moving-in integrated heating and cooling unit (2) is coarsely positioned by a limit switch, and then precisely positioned by the conical engagement of the lower positioning block (103) and the upper positioning ring (207). The setting of the first preset mold closing pressure P0 is related to the target molding pressure P2 and the repeatability positioning accuracy δ, and satisfies the following relationship: P0 = P2 × (1 - η × δ), where η is a dimensionless sensitivity coefficient with a value range of 2~10, and |δ| ≤ ±0.05 mm.

10. The molding method of a PEEK prepreg molding equipment according to claim 7, characterized in that, The demolding and material removal in step S4 specifically involves controlling the movable crossbeam (101) to slowly move upwards to complete the upper mold release. During demolding, the upward speed v satisfies: v = ω × (T) e - T a ) / Te, where ω is the velocity constant, ranging from 1.0 to 2.0 mm·℃ / min, and T e T is the set demolding temperature. a This refers to the real-time temperature of the mold, and T a ≤ T e When T a = T e At time T, v=0; as T... a Decrease, (T) e - T a As the temperature rises, v increases proportionally; then the ejection mechanism (102) rises to support the integrated hot and cold unit (2), and is then driven out by the driving cylinder (104). Finally, the product is removed manually by blowing air through the air holes set on the mold or cold plate (201).

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