Composite material forming and curing method

Abstract

The invention provides a composite material molding and curing method, and belongs to the technical field of composite material product preparation. The problems that in the prior art, due to the fact that heating speed, uniformity and the like are difficult to control, pollution exists, production efficiency is not high, and the requirements for automation, simplicity, practicability, high efficiency and the like of existing production cannot be met are solved. The method comprises the following steps: fixing a mold in a furnace body, and then connecting the mold with an automatic steam internal heating device; steam is introduced into the mold through an automatic steam internal heating device to heat and cure the interior of the mold; in the curing process, gas generated during chemical reaction of the composite material is discharged through an automatic steam internal heating device; after curing, cooling water is introduced into the mold through an automatic steam internal heating device for direct cooling; and after cooling, the formed mold is taken out. The method is mainly used for preparing composite materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material product preparation, and in particular relates to a composite material forming and curing method. Background Art

[0002] The existing FRP membrane shells, FRP pressure tank curing, composite tower poles, composite wire poles, etc. adopt external curing in the production process, which has low production efficiency, long cooling time, long curing time, difficult transportation, and large floor space. In this case, there is an urgent need for an efficient and stable production method with internal heating. Currently, there are curing forms such as thermal oil and electricity. Due to the difficulties in controlling the heating speed and uniformity, there are pollution problems and low production efficiency. They cannot meet the current requirements of production automation, simplification, practicality, and efficiency. Summary of the Invention

[0003] In view of this, the present invention aims to propose a composite material molding and curing method to solve the problems of the existing technology due to difficulties in controlling heating speed and uniformity, pollution problems, low production efficiency, and inability to adapt to current production automation, simplification, practicality, and efficiency requirements.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A composite material forming and curing method comprises the following steps: Step 1: Fix the mold inside the furnace body, and then connect the mold to the automatic steam internal heating device; Step 2: Steam is introduced into the mold through an automatic steam internal heating device to heat and solidify the mold; Step 3: During the curing process, the gas generated by the chemical reaction of the composite material is discharged through the automatic steam internal heating device; Step 4: After curing, cooling water is passed into the mold through the automatic steam internal heating device for direct cooling; Step 5: After cooling, take out the mold.

[0005] Furthermore, the automatic steam internal heating device includes a compressed air valve, a water supply valve, a main steam valve and a water separator, the water separator is connected to the mold, the steam output end of the main steam valve is connected to the water separator, the compressed air output end of the compressed air valve is connected to the main line between the main steam valve and the water separator, and the cooling water output end of the water supply valve is connected to the main line between the main steam valve and the water separator.

[0006] Furthermore, the output end of the water distributor is connected to a three-way valve, one path of the three-way valve is connected to the over-temperature exhaust tank, and the other path is connected to the cooling return water tank. A condensed water flow pipeline is provided on the pipeline connecting the three-way valve and the over-temperature exhaust tank, and the condensed water flow pipeline is connected to the condensed water return tank.

[0007] Furthermore, a manual valve, a pneumatic ball valve and a check valve are sequentially provided along the medium flow direction of the pipeline connecting the compressed air valve and the water supply valve to the main pipeline.

[0008] Furthermore, an angle seat valve, a regulating valve, a check valve and a filter are sequentially provided on the main pipe between the main steam valve and the water distributor along the steam flow direction.

[0009] Furthermore, a filter and a thermocouple are sequentially provided on the pipeline connecting the water distributor and the three-way valve along the flow direction, and a pneumatic ball valve and an over-temperature valve are sequentially provided on the pipeline connecting the three-way valve and the over-temperature exhaust tank along the steam flow direction.

[0010] Furthermore, a manual valve, a steam trap and a check valve are sequentially provided on the condensate flow pipeline along the flow direction of the condensate.

[0011] Furthermore, the automatic steam internal heating device also includes a PLC system, a digital input module, a digital output module, an analog input module and an analog output module. The digital input module transmits the digital signal to the PLC system, and the PLC system transmits the digital signal to the digital output module. The digital output module is used to switch the alarm device of the automatic steam internal heating device and control the opening and closing of the air valve, water supply valve, main steam valve, angle seat valve, regulating valve, three-way valve and over-temperature valve. The analog input module collects the temperature through a thermocouple and transmits it to the PLC system. The PLC system transmits the temperature signal to the analog output module, and the analog output module is used to control the regulating valve.

[0012] Furthermore, the automatic steam internal heating device also includes a touch screen, and the information interaction end of the touch screen is connected to the information interaction end corresponding to the PLC system.

[0013] Furthermore, the water separator is connected to the cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention combines multiple systems to complete rapid curing, precise temperature adjustment, and cooling to complete product production in one step. The overall system adopts PLC + temperature control module, and can also be multi-station to achieve automatic completion, solving the problems of long time of external curing furnace, inability to cool, long turnover time, reducing one curing furnace, saving space, and saving equipment.

[0015] 2. The present invention heats and cures directly from the inside of the mold, and the gas generated during the chemical reaction of the composite material is discharged from the inside to the outside in time, avoiding product stratification, directly solving the problem of poor exhaust gas during external curing and the generation of waste, and reducing the waste rate of external curing. For special high-pressure products with thick walls, the design of internal curing plus external curing accelerates the curing of the product. The original external curing took 10 to 12 hours to complete, and the internal curing plus external curing product curing is completed in 4 to 5 hours, which greatly improves production efficiency and reduces the waste rate.

[0016] 3. The present invention directly uses the cooling water channel inside the core shaft for direct cooling, which takes only 15 to 20 minutes and does not require transportation, and can be completed in one go.

[0017] 4. The present invention can realize manual / automatic control, which can be switched to achieve uniaxial curing and independent curing with high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic structural diagram of the connection between the automatic steam internal heating device and the furnace body according to the present invention; Figure 2 This is a schematic structural diagram of the automatic steam internal heating device of the present invention; Figure 3 This is a process flow chart for composite material molding and curing; Figure 4 Schematic diagram of the structure of the mold of the present invention; Figure 5 This is the PLC system control flow chart of the present invention In the picture: 1- Compressed air valve, 2- Water supply valve, 3- Manual valve, 4- Pneumatic ball valve, 5- Check valve, 6- Regulating valve, 7- Angle seat valve, 8- Main steam valve, 9- Filter, 10- Over-temperature exhaust tank, 11- Cooling return tank, 12- Steam trap, 13- Three-way valve, 14- Thermocouple, 15- Condensate return tank, 16- Cylinder, 17- Water distributor, 18- Mold, 19- Furnace body, 20- Over-temperature valve. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0020] Specific implementation 1: See Figure 1-5 This embodiment describes a composite material forming and curing method, which includes the following steps: Step 1: Fix the mold 18 in the furnace body 19, and then connect the mold 18 to the automatic steam internal heating device; Step 2: Steam is introduced into the mold 18 through an automatic steam internal heating device to heat and solidify the interior of the mold 18; Step 3: During the curing process, the gas generated by the chemical reaction of the composite material is discharged through the automatic steam internal heating device; Step 4: After curing, cooling water is passed into the mold 18 through the automatic steam internal heating device for direct cooling; Step 5: After cooling, the molded mold 18 is taken out.

[0021] After the mold 18 is fixed in the furnace body 19, the mold 18 is heated and cured by the furnace body 19, and the inside of the mold 18 is cured by the automatic steam internal heating device. After curing, it is automatically cooled, enters the cooling water, cools for 10 minutes, and then transferred to the next process.

[0022] Directly heat and cure from the inside of the mold, and discharge the gas generated during the chemical reaction of the composite material from the inside to the outside in time to avoid product stratification, directly solve the problem of poor exhaust gas during external curing, which produces waste and reduces the waste rate of external curing. For special high-pressure products with thick walls, the design of internal curing plus external curing speeds up product curing. The original external curing took 10 to 12 hours to complete, and the internal curing plus external curing product curing can be completed in 4 to 5 hours, which greatly improves production efficiency and reduces the waste rate.

[0023] In order to ensure that the temperature of the product and the mold is consistent, external curing alone requires long-term heating to achieve the temperature consistency of the mold 18 and the product. Steam internal heating heats from the inside, heats up quickly, and has good temperature consistency. For example, it takes 40 minutes to heat the external curing furnace from 40°C to 90°C to achieve the consistency of the mold and the product; steam internal heating takes 15 minutes to heat the mold from 40°C to 90°C to achieve the consistency of the mold and the product, which improves the curing efficiency. In addition, a single external curing method is used. If the externally cured product needs to be cooled, it needs to use a fan or a water tank, or be placed naturally, which takes time, space, personnel, and transportation, which affects efficiency. The present invention directly uses the cooling water channel inside the core shaft for cooling after curing, and directly cools it in just 15 to 20 minutes. It does not require transportation and is completed in one go.

[0024] It can be combined into multiple workstations, saving space and energy costs. It has flexible operation, high thermal efficiency, small temperature difference between front and back, stable product quality, solves cooling problems, reduces waiting time and improves production efficiency.

[0025] Specific implementation method 2: See Figure 1-5To illustrate this embodiment, the automatic steam internal heating device includes a compressed air valve 1, a water supply valve 2, a main steam valve 8 and a water separator 17. The water separator 17 is connected to the mold 18, the steam output end of the main steam valve 8 is connected to the water separator 17, the compressed air output end of the compressed air valve 1 is connected to the main line between the main steam valve 8 and the water separator 17, and the cooling water output end of the water supply valve 2 is connected to the main line between the main steam valve 8 and the water separator 17.

[0026] Open the main steam valve 8 and pass high-temperature steam into the mold 18 through the water separator 17 to solidify the interior. The water separator 17 is used to separate the steam inlet and return steam and water of the mold 18. When the internal temperature of the mold 18 exceeds the set value, open the compressed air valve 1 to pass compressed air into the mold 18. The cold air prevents the product from overheating and damage. The water supply valve 2 is opened to pass cooling water into the mold 18, which can be cooled after solidification. When the temperature fluctuates too much during the steam heating stage, cooling water can be locally introduced to assist in regulation to ensure temperature uniformity.

[0027] In this embodiment, the output end of the water divider 17 is connected to a three-way valve 13, one path of the three-way valve 13 is connected to the over-temperature exhaust tank 10, and the other path is connected to the cooling return water tank 11. A condensed water flow pipeline is provided on the pipeline connecting the three-way valve 13 and the over-temperature exhaust tank 10, and the condensed water flow pipeline is connected to the condensed water return water tank 15.

[0028] In this embodiment, a manual valve 3, a pneumatic ball valve 4 and a check valve 5 are provided in sequence along the medium flow direction of the pipeline connecting the compressed air valve 1 and the water supply valve 2 to the main pipeline. The manual valve 3 is used for maintenance. The pneumatic ball valve 4 is opened to allow the compressed air and cooling water to enter. The check valve 5 prevents steam backflow. When the cooling water returns, it is discharged into the cooling return water tank 11 through the water distributor 17 and the three-way valve 13 is opened.

[0029] In this embodiment, an angle seat valve 7 , a regulating valve 6 , a check valve 5 and a filter 9 are sequentially provided on the main pipe between the main steam valve 8 and the water distributor 17 along the steam flow direction.

[0030] In this embodiment, a filter 9 and a thermocouple 14 are sequentially provided along the flow direction on the pipeline connecting the water separator 17 and the three-way valve 13, and a pneumatic ball valve 4 and an over-temperature valve 20 are sequentially provided along the steam flow direction on the pipeline connecting the three-way valve 13 and the over-temperature exhaust tank 10. After the curing is completed, the high-temperature steam enters the over-temperature exhaust tank 10 through the three-way valve 13 for storage of the high-temperature steam.

[0031] In this embodiment, a manual valve 3, a steam trap 12 and a check valve 5 are provided in sequence on the condensate flow pipeline along the flow direction of the condensate. During the heating process, the condensate returns through the water separator 17 and passes through the filter 9, the three-way valve 13, the manual valve 3, the steam trap 12 and the check valve 5 to be discharged into the condensate return tank 15.

[0032] In this embodiment, the automatic steam internal heating device also includes a PLC system, a digital input module, a digital output module, an analog input module and an analog output module. The digital input module transmits the digital signal to the PLC system, and the PLC system transmits the digital signal to the digital output module. The digital output module is used to switch the alarm device of the automatic steam internal heating device and control the opening and closing of the air valve 1, the water supply valve 2, the main steam valve 8, the angle seat valve 7, the regulating valve 6, the three-way valve 13 and the over-temperature valve 20. The analog input module collects the temperature through the thermocouple 14 and transmits it to the PLC system. The PLC system transmits the temperature signal to the analog output module. The analog output module is used to control the regulating valve 6. The automatic steam internal heating device also includes a touch screen. The information interaction end of the touch screen is connected to the information interaction end corresponding to the PLC system. The opening and closing of each valve is controlled by the PLC system to achieve fully automatic control of the curing and cooling of the product.

[0033] In this embodiment, the water separator 17 is connected to the cylinder 16 .

[0034] The specific embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The specific embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A composite material forming and curing method, characterized in that: It includes the following steps: Step 1: Fix the mold (18) in the furnace body (19), and then connect the mold (18) to the automatic steam internal heating device; Step 2: introducing steam into the mold (18) through an automatic steam internal heating device to heat and solidify the interior of the mold (18); Step 3: During the curing process, the gas generated by the chemical reaction of the composite material is discharged through the automatic steam internal heating device; Step 4: After solidification, cooling water is passed into the mold (18) through an automatic steam internal heating device for direct cooling; Step 5: After cooling, the molded mold (18) is taken out.

2. A composite material forming and curing method according to claim 1, characterized in that: The automatic steam internal heating device comprises a compressed air valve (1), a water supply valve (2), a main steam valve (8) and a water distributor (17), wherein the water distributor (17) is connected to the mold (18), the steam output end of the main steam valve (8) is connected to the water distributor (17), the compressed air output end of the compressed air valve (1) is connected to the main pipe between the main steam valve (8) and the water distributor (17), and the cooling water output end of the water supply valve (2) is connected to the main pipe between the main steam valve (8) and the water distributor (17).

3. A composite material forming and curing method according to claim 2, characterized in that: The output end of the water distributor (17) is connected to a three-way valve (13), one path of the three-way valve (13) is connected to the over-temperature exhaust tank (10), and the other path is connected to the cooling return water tank (11). A condensed water flow pipeline is provided on the pipeline connecting the three-way valve (13) and the over-temperature exhaust tank (10), and the condensed water flow pipeline is connected to the condensed water return water tank (15).

4. A composite material forming and curing method according to claim 3, characterized in that: A manual valve (3), a pneumatic ball valve (4) and a check valve (5) are sequentially provided along the medium flow direction along the pipeline connecting the compressed air valve (1) and the water supply valve (2) to the main pipeline.

5. A composite material forming and curing method according to claim 4, characterized in that: An angle seat valve (7), a regulating valve (6), a check valve (5) and a filter (9) are sequentially provided on the main pipe between the main steam valve (8) and the water distributor (17) along the steam flow direction.

6. A composite material forming and curing method according to claim 5, characterized in that: A filter (9) and a thermocouple (14) are sequentially provided on the pipeline connecting the water distributor (17) and the three-way valve (13) along the flow direction, and a pneumatic ball valve (4) and an overtemperature valve (20) are sequentially provided on the pipeline connecting the three-way valve (13) and the overtemperature exhaust tank (10) along the steam flow direction.

7. A composite material forming and curing method according to claim 6, characterized in that: A manual valve (3), a steam trap (12) and a check valve (5) are sequentially provided on the condensate flow pipeline along the condensate flow direction.

8. A composite material forming and curing method according to claim 7, characterized in that: The automatic steam internal heating device further comprises a PLC system, a digital input module, a digital output module, an analog input module and an analog output module. The digital input module transmits a digital signal to the PLC system, and the PLC system transmits a digital signal to the digital output module. The digital output module is used for switching the alarm device of the automatic steam internal heating device and controlling the opening and closing of the air valve (1), the water supply valve (2), the main steam valve (8), the angle seat valve (7), the regulating valve (6), the three-way valve (13) and the over-temperature valve (20). The analog input module collects temperature through a thermocouple (14) and transmits it to the PLC system. The PLC system transmits the temperature signal to the analog output module. The analog output module is used to control the regulating valve (6).

9. A composite material forming and curing method according to claim 8, characterized in that: The automatic steam internal heating device further comprises a touch screen, and an information interaction terminal of the touch screen is connected to an information interaction terminal corresponding to the PLC system.

10. The composite material forming and curing method according to claim 1, characterized in that: The water distributor (17) is connected to the cylinder (16).

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