Rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device and process

Abstract

The present invention provides a rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device, comprising an upper driving mechanism, a lower driving mechanism, a vertical guiding mechanism, and an upper base, an upper mold, a lower mold and a lower base arranged in sequence from top to bottom, an upper heating plate is arranged at the bottom of the upper base, a lower heating plate is arranged at the top of the lower base, and a cooling mechanism is embedded in the upper mold and the lower mold. The upper driving mechanism drives the upper mold to rise and fall along the vertical guiding mechanism, the lower mold is installed on the vertical guiding mechanism and can rise and fall along it, the vertical guiding mechanism is provided with a minimum limit mechanism corresponding to the lower mold, and the lower driving mechanism drives the lower base to rise and fall along the vertical guiding mechanism; the present invention also provides a continuous carbon fiber thermoplastic U-shaped part forming process. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device and process have the advantages of scientific design, high production efficiency, low energy consumption, good product quality, and economic applicability.

Description

Technical Field

[0001] The invention relates to a molding device and a process, and in particular to a rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part molding device and a process method. Background Art

[0002] Compared with continuous carbon fiber reinforced thermosetting composite products, continuous carbon fiber reinforced thermoplastic composite products have good toughness, and their molding is a physical process with high production efficiency. They have been widely used in various fields in recent years.

[0003] The existing molding methods of continuous carbon fiber reinforced thermoplastic parts mainly include cold mold pressing and hot mold pressing. The advantage of cold mold pressing is that the heating of the prepreg after laying and mold pressing can be carried out simultaneously at different stations, and the production efficiency is relatively high. The disadvantage is that the prepreg after heating and softening needs to be kept warm during the whole process of station transfer, which has high requirements on equipment. Poor insulation effect will cause local hardening of the prepreg surface, resulting in defects such as poor product surface quality, poor interlayer bonding and easy cracking. The advantage of hot mold pressing is that the prepreg is heated and softened in the mold and hot-pressed, the product is heated evenly, the interlayer bonding is good, and the surface quality is guaranteed. The disadvantage is that the mold needs to be heated first and then cooled during molding, which has high energy consumption and low production efficiency.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and thereby provide a rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device and process which has a scientific design, high production efficiency, low energy consumption, good product quality and economic applicability.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device, comprising an upper driving mechanism, a lower driving mechanism, a vertical guiding mechanism, and an upper base, an upper mold, a lower mold corresponding to the upper mold and a lower base arranged in sequence from top to bottom, an upper heating plate is arranged at the bottom of the upper base, a lower heating plate is arranged at the top of the lower base, a cooling mechanism is embedded in the upper mold and the lower mold, the upper driving mechanism drives the upper mold to rise and fall along the vertical guiding mechanism, the lower mold is installed on the vertical guiding mechanism and can be lifted and lowered along it, the vertical guiding mechanism is provided with a minimum limit mechanism corresponding to the lower mold, and the lower driving mechanism drives the lower base to rise and fall along the vertical guiding mechanism.

[0007] Based on the above, a concave cavity is arranged at the bottom of the upper mold, and the concave cavity is a structure with a horizontal top wall and vertical side walls. An upper convex core is arranged at the top of the lower mold corresponding to the concave cavity. A vertical slide groove is opened on the top wall of the concave cavity, and a downward pressure slider is arranged in the vertical slide groove. A downward pressure spring is arranged between the downward pressure slider and the vertical slide groove. In a natural state, the bottom surface of the downward pressure slider is not higher than the bottom edge of the concave cavity. In a pressurized state, the bottom surface of the downward pressure slider can be flush with the top wall of the concave cavity.

[0008] Based on the above, the top of the downward pressing sliding block is connected to a vertical guide rod, the top wall of the vertical sliding groove is provided with a guide hole corresponding to the vertical guide rod, and the downward pressing spring is sleeved on the vertical guide rod.

[0009] Based on the above, the cooling mechanism is a plurality of cooling water pipes arranged near the molding parts of the upper mold and the lower mold, each of the cooling water pipes includes a water inlet pipe and a water outlet pipe arranged side by side, one end of the water inlet pipe and the water outlet pipe are connected, and the other end of the water inlet pipe and the other end of the water outlet pipe are connected with inlet and outlet joints, the water inlet pipe is arranged close to the molding part, and the water outlet pipe is arranged away from the molding part.

[0010] Based on the above, the cross section of the water inlet pipe is rectangular, and the cross section of the water outlet pipe is semicircular.

[0011] Based on the above, the vertical guiding mechanism includes four Green columns and two vertical sliding rods, the two ends of the upper mold and the two ends of the lower mold are respectively mounted on the two vertical sliding rods, and the lower base is lifted and lowered along the four Green columns.

[0012] Based on the above, the upper base includes an upper mounting plate, and the four corners of the upper mounting plate are fixedly mounted on the top of the four Green columns. The lower base includes a lower mounting plate, and the four corners of the lower mounting plate are passed through the four Green columns. Asbestos insulation boards are respectively sandwiched between the upper mounting plate and the upper heating plate and between the lower mounting plate and the lower heating plate.

[0013] Based on the above, the upper driving mechanism is two upper die driving cylinders, the cylinder barrels of the upper die driving cylinders are fixed on the upper mounting plate, and the piston rod ends of the upper die driving cylinders drive the upper die to rise and fall.

[0014] Based on the above, the lower driving mechanism is a lower die driving cylinder, and the piston rod end of the lower die driving cylinder drives the lower base to rise and fall.

[0015] Based on the above, it also includes a temperature control table for controlling the temperature of the upper heating plate and the temperature of the lower heating plate.

[0016] The present invention also provides a process for producing a continuous carbon fiber thermoplastic U-shaped part by using the above-mentioned rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device, comprising the following steps:

[0017] S1: The upper driving mechanism and the lower driving mechanism are driven upward to close the upper mold and the lower mold, the upper heating plate is fitted with the upper mold, the lower heating plate is fitted with the lower mold, and the upper heating plate and the lower heating plate are set to preheat the mold;

[0018] S2: The lower driving mechanism drives the lower mold to descend until the mold is slightly opened and the prepreg with good layering is placed in it;

[0019] S3: the lower driving mechanism drives the lower mold to slowly rise, and the mold is closed until the lower pressing slider spreads the top of the prepreg horizontally and evenly spreads it on the surface of the upper convex core, and is kept at the set temperature for a period of time;

[0020] S4: the lower driving mechanism continues to drive the lower mold to slowly rise, closing the mold to half the depth of the inner concave cavity, and maintaining it at a relatively low pressure and the set temperature for a period of time;

[0021] S5: The lower driving mechanism continues to drive the lower mold to slowly rise to a fully molded state, and maintains it at a relatively low pressure and the set temperature for a period of time;

[0022] S6: increasing the pressure and maintaining the pressure at the set temperature for a period of time to complete compaction and shaping;

[0023] S7: The upper driving mechanism and the lower driving mechanism are driven downward synchronously to separate the upper heating plate and the upper mold while maintaining the mold clamping pressure;

[0024] S8: When the lower mold descends to the lowest limit mechanism, the lower driving mechanism continues to drive downward to separate the lower heating plate from the lower mold;

[0025] S9: Cooling the upper mold and the lower mold by the cooling mechanism, and opening the upper mold and the lower mold after the temperatures drop to the mold opening temperature.

[0026] The present invention has outstanding substantial features and significant progress compared with the prior art. Specifically, the present invention can realize the contact and separation of the upper mold and the upper heating plate, the contact and separation of the lower mold and the lower heating plate, and the opening and closing of the upper mold and the lower mold through the arrangement of the upper heating plate, the upper mold, the lower mold, the lower heating plate and the minimum limit mechanism, and the driving of the upper driving mechanism and the lower driving mechanism; during the molding process, the mold needs to be heated, and the upper and lower heating plates can be attached to the upper and lower molds; before the mold is opened, the upper and lower heating plates can be separated from the upper and lower molds, and the cooling mechanism can only quickly cool the molding parts of the upper and lower molds, and avoid cooling the upper and lower heating plates due to heat conduction, wherein, when the upper heating plate is separated from the upper mold, the upper driving mechanism and the lower driving mechanism can be driven synchronously to ensure the mold clamping pressure and the product shape, when the lower mold descends to the minimum limit mechanism, the lower heating plate continues to descend to realize the separation of the lower heating plate and the lower mold, and the heating, molding, cooling and mold opening processes of the upper and lower molds are completed on one device, which greatly improves the production efficiency.

[0027] Furthermore, the setting of the pressing slider can allow the bottom surface of the pressing slider to first contact the prepreg when the mold is closed. Under the action of its pressure, the prepreg can be fully unfolded and laid on the top surface of the upper convex core, avoiding the problem that the chamfer of the concave cavity contacts the upper convex core first, which causes wrinkles in the prepreg on the top surface of the upper convex core and affects product quality. When the mold is opened, the pressing slider is gradually reset to facilitate demolding of the product from the concave cavity; the vertical guide rod and the guide hole cooperate with each other to ensure that the pressing slider does not tilt during the lifting and lowering process.

[0028] Furthermore, the cooling water pipeline exchanges heat with the upper and lower molds. The water temperature in the water inlet pipe is lower and it is closer to the molding part, while the water temperature in the water outlet pipe is higher and it is farther away from the molding part, thereby improving the heat exchange efficiency of the molding part. Based on the principle that under the same area, the circumference of a circle is the shortest and the circumference of a rectangle is the longest, the cross-section of the water inlet pipe is set to a rectangle to increase the heat exchange area between the water inlet and the molding part. Compared with the circular pipeline, the theoretical value of the cooling efficiency of the water inlet pipe is increased by 24.8%. The cross-section of the water outlet pipe is set to a semicircle to reduce the heat exchange area between the water outlet and the mold far away from the molding part, which is beneficial to the rapid heating of the mold in the next molding cycle.

[0029] Furthermore, the four Green columns serve as mounting frames to fix the upper mounting plate, and the upper mounting plate in turn fixes the upper mold driving cylinder, guiding the lower mounting plate. The asbestos insulation board can block heat, which can not only keep the upper and lower heating plates warm, but also extend the life of the upper and lower mounting plates; the two vertical sliding rods serve as guiding mechanisms for the upper mold and the lower mold; the temperature control meter is provided to facilitate the control of the temperature of the upper and lower molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a stereoscopic diagram of the rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device of the present invention.

[0031] Figure 2 It is a front view of the rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device of the present invention.

[0032] Figure 3 It is a cross-sectional view of the upper mold and the lower mold in the present invention.

[0033] Figure 4 It is a structural schematic diagram of the cooling water pipeline in the present invention.

[0034] Figure 5 This is a picture of the cross section of the product produced by this process magnified 300 times.

[0035] Figure 6 This is a picture of the cross section of the product produced by this process magnified 600 times.

[0036] In the figure: 1. Green column; 2. Vertical slide bar; 3. Upper die driving cylinder; 4. Upper mounting plate; 5. Upper die; 6. Lower die; 7. Lower mounting plate; 8. Lower die driving cylinder; 9. Upper heating plate; 10. Lower heating plate; 11. Asbestos insulation board; 12. Prepreg; 13. Temperature control meter; 14. Water inlet pipe; 15. Water outlet pipe; 16. Water inlet and outlet joints; 51. Inward concave cavity; 52. Vertical slide groove; 53. Downward pressing slider; 54. Vertical guide rod; 55. Downward pressing spring; 61. Upper convex core. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0038] like Figures 1 to 4As shown, a rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device comprises an upper driving mechanism, a lower driving mechanism, four Green columns 1, two vertical slide bars 2, and an upper base, an upper mold 5, a lower mold 6 and a lower base arranged in sequence from top to bottom, an upper heating plate 9 is arranged at the bottom of the upper base, a lower heating plate 10 is arranged at the top of the lower base, and a cooling mechanism is embedded in the upper mold 5 and the lower mold 6; the two ends of the upper mold 5 and the two ends of the lower mold 6 are respectively sleeved on the two vertical slide bars 2, the upper driving mechanism drives the upper mold 5 to rise and fall, and a minimum limit mechanism is arranged on the vertical slide bar 2 corresponding to the lower mold 6, and the lower driving mechanism drives the lower base to rise and fall along the four Green columns 1, and the four Green columns 1 and the two vertical slide bars 2 together constitute a vertical guiding mechanism to guide the movement direction of the upper mold 5, the lower mold 6 and the lower base.

[0039] The upper base specifically includes an upper mounting plate 4, and the four corners of the upper mounting plate 4 are fixedly mounted on the top ends of the four Green columns 1. The lower base includes a lower mounting plate 7, and the four corners of the lower mounting plate 7 are penetrated on the four Green columns 1. Asbestos insulation plates 11 are respectively sandwiched between the upper mounting plate 4 and the upper heating plate 9 and between the lower mounting plate 7 and the lower heating plate 10, which can block heat, keep the upper and lower heating plates warm, and extend the service life of the upper mounting plate 4 and the lower mounting plate 7.

[0040] The upper driving mechanism is specifically two upper mold driving cylinders 3, the cylinder barrels of the upper mold driving cylinders 3 are fixed on the upper mounting plate 4, the piston rod ends of the upper mold driving cylinders 3 are connected to the upper mold 5, and the upper mold 5 is driven to rise and fall through the extension and contraction of the upper mold driving cylinders 3; the lower driving mechanism is specifically a lower mold driving cylinder 8, the piston rod end of the lower mold driving cylinder 8 is driven and connected to the lower mounting plate 7, and the lower base is driven to rise and fall through the extension and contraction of the lower mold driving cylinder 8. When the lower base rises to contact with the lower mold 6, the lower mold 6 can be driven to rise and fall.

[0041] During specific use, through the setting of the upper heating plate 9, the upper mold 5, the lower mold 6, the lower heating plate 10 and the minimum limit mechanism, and through the driving of the upper mold driving cylinder 3 and the lower mold driving cylinder 8, the contact and separation of the upper mold 5 and the upper heating plate 9, the contact and separation of the lower mold 6 and the lower heating plate 10, and the opening and closing of the upper mold 5 and the lower mold 6 can be achieved; during the molding process, the mold needs to be heated, the upper and lower heating plates can be fitted together with the upper and lower molds, and the contact plane area and thickness of the upper and lower heating plates can be set much larger than the upper and lower molds, so that the upper and lower heating plates can not only quickly heat the mold, but also play a role in heat storage; cooling is required before opening the mold, the upper and lower heating plates can be separated from the upper and lower molds, and the cooling mechanism can only quickly cool the molding parts of the upper and lower molds, and avoid cooling of the upper and lower heating plates due to heat conduction.

[0042] A concave cavity 51 is provided at the bottom of the upper mold 5, and the concave cavity 51 is a structure with a horizontal top wall and vertical side walls. An upper convex core 61 is provided at the top of the lower mold 6 corresponding to the concave cavity 51. In order to further improve product quality, a vertical slide groove 52 is provided on the top wall of the concave cavity 51, and a downward pressure slider 53 is provided in the vertical slide groove 52. A downward pressure spring 55 is provided between the downward pressure slider 53 and the vertical slide groove 52. In a natural state, the bottom surface of the downward pressure slider 53 is not higher than the bottom edge of the concave cavity 51. In a pressurized state, the bottom surface of the downward pressure slider 53 can be flush with the top wall of the concave cavity 51. When the mold is closed, the bottom surface of the pressing slider 53 first contacts the prepreg 12. Under the action of its pressure, the prepreg 12 can be fully unfolded and laid on the top surface of the upper convex core 61, avoiding the problem that the chamfer of the concave cavity 51 contacts the upper convex core 61 first, causing the prepreg 12 on the top surface of the upper convex core 61 to wrinkle, affecting the product quality. When the mold is opened, the pressing slider 53 gradually returns to its original position, facilitating the demoulding of the product from the concave cavity 51.

[0043] To prevent the downward pressing slider 53 from tilting during the sliding process, a vertical guide rod 54 is connected to the top of the downward pressing slider 53, and a guide hole is provided on the top wall of the vertical slide groove 52 corresponding to the vertical guide rod 54. The downward pressing spring 55 is sleeved on the vertical guide rod 54, and the two cooperate with each other to ensure that the downward pressing slider 53 does not tilt during the lifting process.

[0044] The cooling mechanism is specifically three cooling water pipelines arranged near the molding parts of the upper mold 5 and the lower mold 6, each of the cooling water pipelines includes an inlet pipe 14 and an outlet pipe 15 arranged side by side, the inlet pipe 14 and one end of the outlet pipe 15 are connected, and the other end of the inlet pipe 14 and the other end of the outlet pipe 15 are connected with an inlet and outlet joint 16, the inlet pipe 14 is arranged close to the molding part, and the outlet pipe 15 is arranged far away from the molding part, the cross section of the inlet pipe 14 is rectangular, and the cross section of the outlet pipe 15 is semicircular. When in use, the water temperature in the water inlet pipe 14 is lower and it is closer to the molding part, while the water temperature in the water outlet pipe 15 is higher and it is farther away from the molding part, so that the heat exchange efficiency of the molding part can be improved; and according to the principle that under the same area, the circumference of a circle is the shortest and the circumference of a rectangle is the longest, the cross-section of the water inlet pipe 14 is set to a rectangle to increase the heat exchange area between the water inlet and the molding part. Compared with a circular pipeline, the theoretical value of the cooling efficiency of the water inlet pipe is increased by 24.8%; the cross-section of the water outlet pipe 15 is set to a semicircle to reduce the heat exchange area between the water outlet and the mold away from the molding part, which is beneficial to the rapid heating of the mold in the next molding cycle.

[0045] In order to facilitate observation of the temperature of the mold, it also includes a temperature control meter 13 for displaying the temperature of the upper mold 5 and the temperature of the lower mold 6.

[0046] The molding process of continuous carbon fiber reinforced nylon raw material as prepreg 12 is described as follows:

[0047] The suitable molding temperature of the prepreg 12 is 255°C to 265°C. First, the upper mold 5 and the lower mold 6 need to be preheated. The upper mold driving cylinder 3 drives the upper mold 5 to move upward until the upper mold 5 is in contact with the upper heating plate 9. The lower mold driving cylinder 8 drives the lower base to rise. After the lower heating plate 10 is in contact with the lower mold 6, it continues to rise until the upper mold 5 and the lower mold 6 are in a mold closing state. The temperature in the temperature control table 13 is set to 260°C, and the upper mold 5 and the lower mold 6 are heated to 260°C.

[0048] Then, the dynamic step-by-step mold closing steps are performed: (1) Since the upper mold 5 and the lower mold 6 are in the mold closing state when they are preheated, at this time, the lower mold driving cylinder 8 first drives the lower base to descend, so that the lower mold 6 descends, until the upper and lower molds are slightly opened, and the prepreg 12 with good layering is placed; (2) The lower mold driving cylinder 8 then slowly drives the lower base to rise, and the mold is closed until the lower pressing slider 53 spreads the top of the prepreg 12 horizontally and evenly spreads it on the surface of the upper convex core 61. At this time, the upper and lower mold temperatures are maintained at 260°C for five minutes to completely soften the prepreg 12, and the pressure of the lower mold driving cylinder 8 is controlled at 0 bar; (3) The lower mold driving cylinder 8 continues to drive the lower base to rise, and the mold is closed to half the depth of the concave cavity 51. The upper and lower mold temperatures are maintained at 260°C for half a minute, and the pressure of the lower mold driving cylinder 8 is controlled not to exceed 100 bar; (4) the lower die driving cylinder 8 continues to drive the lower base to rise, the mold is fully closed, the upper and lower mold temperatures are maintained at 260°C for one minute, and the pressure of the lower die driving cylinder 8 is controlled not to exceed 100 bar; (5) the pressure of the lower die driving cylinder 8 is increased to 400 bar and maintained for half a minute to fully compact and shape the prepreg 12.

[0049] Finally, the molded product is cooled and opened: (1) the upper mold driving cylinder 3 and the lower mold driving cylinder 8 are driven downward synchronously to separate the upper mold 5 from the upper heating plate 9, while maintaining the mold clamping pressure. When the lower mold 6 drops to the minimum limit mechanism, it stops descending and the lower mold driving cylinder 8 continues to descend to separate the lower mold 6 from the lower heating plate 10; (2) 0.2 MPa high-pressure cooling water is injected into the cooling water pipeline for about 2 minutes. At this time, the mold clamping pressure is still maintained at 400 bar by relying on the pressure of the upper mold driving cylinder 3; (3) The molded product is cooled to below 120°C and the mold can be opened. The upper mold driving cylinder 3 drives the upper mold 5 to rise, the mold is opened, and the molded product can be taken out.

[0050] The above production process has a production cycle of only about 9 minutes, which realizes rapid molding. In the hot pressing molding process of continuous carbon fiber reinforced nylon prepreg, if the temperature and pressure are not appropriate, it will lead to poor interlayer bonding and the existence of pores, which seriously affect the mechanical properties of the product. In order to characterize the performance of the molded product of this process, the inventor also used an ultra-depth of field microscope to observe the cross-section of the molded product. In the picture magnified 300 times ( Figure 5 ) shows that in the thickness section of the product, the boundaries between the layers are obvious but well combined, and there are no obvious pores between the layers. From the 600x magnified picture ( Figure 6 ) It can be seen that the fiber is completely wrapped by the resin and the impregnation effect is relatively good. Therefore, the quality of the products made by this process has been greatly improved. After tensile testing, the average tensile strength of the product is 512.4MPa, the average tensile modulus is 34.5Gpa, and the mechanical properties are excellent.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device, characterized in that: It comprises an upper driving mechanism, a lower driving mechanism, a vertical guiding mechanism, and an upper base, an upper mold, a lower mold and a lower base arranged in sequence from top to bottom, an upper heating plate is arranged at the bottom of the upper base, a lower heating plate is arranged at the top of the lower base, a cooling mechanism is embedded in both the upper mold and the lower mold, the upper driving mechanism drives the upper mold to rise and fall along the vertical guiding mechanism, the lower mold is installed on the vertical guiding mechanism and can rise and fall along the vertical guiding mechanism, the vertical guiding mechanism is provided with a minimum limit mechanism corresponding to the lower mold, and the lower driving mechanism drives the lower base to rise and fall along the vertical guiding mechanism; The vertical guide mechanism includes four Green columns and two vertical slide bars, the two ends of the upper mold and the two ends of the lower mold are respectively sleeved on the two vertical slide bars, and the lower base is lifted and lowered along the four Green columns; The upper base includes an upper mounting plate, the four corners of which are fixedly mounted on the tops of the four Green columns, the lower base includes a lower mounting plate, the four corners of which are passed through the four Green columns, and asbestos insulation plates are respectively sandwiched between the upper mounting plate and the upper heating plate and between the lower mounting plate and the lower heating plate; The upper driving mechanism is two upper mold driving cylinders, the cylinder barrels of the upper mold driving cylinders are fixed on the upper mounting plate, and the piston rod ends of the upper mold driving cylinders drive the upper mold to rise and fall; the lower driving mechanism is a lower mold driving cylinder, and the piston rod end of the lower mold driving cylinder drives the lower base to rise and fall.

2. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to claim 1 is characterized in that: A concave cavity is arranged at the bottom of the upper mold, and the concave cavity is a structure with a horizontal top wall and vertical side walls. An upper convex core is arranged at the top of the lower mold corresponding to the concave cavity. A vertical slide groove is opened on the top wall of the concave cavity, and a downward pressure slider is arranged in the vertical slide groove. A downward pressure spring is arranged between the downward pressure slider and the vertical slide groove. In a natural state, the bottom surface of the downward pressure slider is not higher than the bottom edge of the concave cavity. In a pressurized state, the bottom surface of the downward pressure slider can be flush with the top wall of the concave cavity.

3. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to claim 2 is characterized in that: The top of the downward pressing sliding block is connected with a vertical guide rod, the top wall of the vertical sliding groove is provided with a guide hole corresponding to the vertical guide rod, and the downward pressing spring is sleeved on the vertical guide rod.

4. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to any one of claims 1 to 3, characterized in that: The cooling mechanism is a plurality of cooling water pipes arranged near the forming parts of the upper mold and the lower mold, each of the cooling water pipes includes a water inlet pipe and a water outlet pipe arranged side by side, one end of the water inlet pipe is connected to the water outlet pipe, and the other end of the water inlet pipe and the other end of the water outlet pipe are connected with inlet and outlet joints, the water inlet pipe is arranged close to the forming part, and the water outlet pipe is arranged away from the forming part.

5. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to claim 4 is characterized in that: The cross section of the water inlet pipe is rectangular, and the cross section of the water outlet pipe is semicircular.

6. The rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to any one of claims 1, 2, 3, and 5, characterized in that: It also includes a temperature control table for controlling the temperature of the upper heating plate and the temperature of the lower heating plate.

7. A process for producing continuous carbon fiber thermoplastic U-shaped parts by using the rapid heating and cooling separation type continuous carbon fiber thermoplastic U-shaped part forming device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: The upper driving mechanism and the lower driving mechanism are driven upward to close the upper mold and the lower mold, the upper heating plate is fitted with the upper mold, the lower heating plate is fitted with the lower mold, and the upper heating plate and the lower heating plate are set to preheat the mold; S2: The lower driving mechanism drives the lower mold to descend until the mold is slightly opened and the prepreg with good layering is placed in it; S3: the lower driving mechanism drives the lower mold to slowly rise, and the mold is closed until the lower pressing slider spreads the top of the prepreg horizontally and evenly spreads it on the surface of the upper convex core, and is kept at the set temperature for a period of time; S4: the lower driving mechanism continues to drive the lower mold to slowly rise, closing the mold to half the depth of the inner concave cavity, and maintaining it at a relatively low pressure and the set temperature for a period of time; S5: The lower driving mechanism continues to drive the lower mold to slowly rise to a fully closed mold state, and maintains it for a period of time at a relatively low pressure and the set temperature; S6: increasing the pressure and maintaining the pressure at the set temperature for a period of time to complete compaction and shaping; S7: The upper driving mechanism and the lower driving mechanism are synchronously driven downward to separate the upper heating plate and the upper mold while maintaining the mold clamping pressure; S8: When the lower mold descends to the lowest limit mechanism, the lower driving mechanism continues to drive downward to separate the lower heating plate from the lower mold; S9: Cooling the upper mold and the lower mold by the cooling mechanism, and opening the upper mold and the lower mold after the temperatures drop to the mold opening temperature.

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