Internal liquid circulation heating type composite material curing device

Abstract

The invention discloses an internal liquid circulation heating type composite material curing device which comprises a liquid heating and pressurizing machine, a flow guide pipe, a section mold, a sealing cover, a flow guide opening cover and a sealing gasket. The two sealing covers are arranged at the two ends of the section mold respectively; a sealing gasket is arranged between the sealing cover and the section mold; each sealing cover is provided with two flow guide openings, one flow guide opening is provided with a flow guide opening cover, and the other flow guide opening is communicated with the liquid heating and pressurizing machine through a flow guide pipe. The device is simple in structure and low in cost, the curing process is easy to control, and response is rapid; the curing agent is high in compatibility, can meet the curing requirements of various large-size composite material parts with closed condition type molds, has no special site requirements, and does not need matched equipment; the curing sequence is from inside to outside, so that gas in the composite material can be discharged, and the porosity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber composite material processing, and in particular relates to an internal liquid circulation heating type composite material curing device. Background Art

[0002] Carbon fiber refers to high-strength modulus fiber with a carbon content of more than 90%, which is formed by cracking and carbonizing organic fibers under high temperature. As an excellent strategic new material, carbon fiber has excellent properties that cannot be replaced by other materials, such as light weight, high strength, high modulus, high temperature resistance, corrosion resistance, erosion and sputtering resistance, good designability, and compositeness. It is an indispensable strategic new material in modern times.

[0003] At present, for the processing of large thermosetting matrix carbon fiber composite materials, it is difficult to manufacture special pressing plates, and curing devices such as curing furnaces or ovens are mostly used for heating and curing. A significant feature of this curing method is that the temperature of the material is transmitted from the outer surface, and the outer surface of the material is cured before the inner part, resulting in the inability to discharge the internal bubbles smoothly during the curing process, and the porosity is too high, which may reduce the material performance at best, or cause processing failure and scrap parts at worst. For this situation, the solution currently adopted by manufacturers is to wrap the material as a whole in a vacuum bag, and at the same time heat and pressurize the outside as needed, prolong the temperature rise time, and use huge pressure to "squeeze out" the bubbles inside the material in the softened state before the material is cured. Although the above technical solutions can meet the requirements for composite material processing, there are still the following situations that need to be optimized: (1) The heating process is slow and requires fine control to prevent the local temperature from being too high, which may cause the internal bubbles to be unable to be removed in time; (2) If the size of the material is too large and exceeds the original curing furnace or oven, new large-size equipment needs to be produced for processing and curing; (3) The equipment used is too large and large in size, making it difficult to move. Summary of the invention

[0004] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art and provides an internal liquid circulation heating composite material curing device with simple structure, low cost, easy control of the curing process and rapid response; high compatibility, can meet the curing needs of various large-size composite material parts with closed molds, and no special site requirements and no supporting equipment are required; the curing sequence is from inside to outside, which is conducive to the discharge of gas in the composite material and reduces the porosity.

[0005] In order to solve the above technical problems, the present invention discloses an internal liquid circulation heating composite material curing device, comprising: a liquid heating pressurizing machine, a first guide pipe, a second guide pipe, a mold, a first sealing cover, a second sealing cover, a first guide port cover, a second guide port cover, a first sealing gasket and a second sealing gasket;

[0006] The first sealing cover and the second sealing cover are respectively arranged at the two ends of the mold; the first sealing gasket is arranged between the first sealing cover and the mold to achieve sealing between the first sealing cover and the mold; the second sealing gasket is arranged between the second sealing cover and the mold to achieve sealing between the second sealing cover and the mold;

[0007] The first sealing cover is provided with a first guide port and a third guide port, and the second sealing cover is provided with a second guide port and a fourth guide port; a first guide port cover is provided at the first guide port, and a second guide port cover is provided at the second guide port; one end of the first guide pipe is connected to the liquid outlet of the liquid heating and pressing machine, and the other end is connected to the third guide port; one end of the second guide pipe is connected to the liquid inlet of the liquid heating and pressing machine, and the other end is connected to the fourth guide port.

[0008] In the above-mentioned internal liquid circulation heating type composite material curing device, the internal liquid circulation heating type composite material curing device is used for curing thermosetting matrix carbon fiber composite material prepreg.

[0009] In the above-mentioned internal liquid circulation heating composite material curing device, the first guide port and the second guide port are used to add liquid to the inside of the mold and to exhaust gas.

[0010] In the above-mentioned internal liquid circulation heating composite material curing device, the liquid heating pressurizer is used to circulate and heat the liquid medium inside the mold and control the heating rate and heating temperature.

[0011] In the above internal liquid circulation heating composite material curing device, the first sealing cover and the second sealing cover are produced and processed in accordance with the outer shape of the mold and are closely matched with the openings at both ends of the mold.

[0012] In the above-mentioned internal liquid circulation heating composite material curing device, the first sealing gasket is produced in conjunction with the first sealing cover to seal the gap between the first sealing cover and the mold; the second sealing gasket is produced in conjunction with the second sealing cover to seal the gap between the second sealing cover and the mold.

[0013] In the above-mentioned internal liquid circulation heating composite material curing device, the first guide pipe is matched with the liquid outlet of the liquid heating and pressing machine and the third guide port on the first sealing cover to realize the connection between the liquid outlet and the third guide port; the second guide pipe is matched with the liquid inlet of the liquid heating and pressing machine and the fourth guide port on the second sealing cover to realize the connection between the liquid inlet and the fourth guide port.

[0014] In the above internal liquid circulation heating composite material curing device, the first guide port cover is matched with the first guide port and is used to close the first guide port; the second guide port cover is matched with the second guide port and is used to close the second guide port.

[0015] In the above internal liquid circulation heating composite material curing device, the first sealing gasket and the second sealing gasket are both rubber rings.

[0016] In the above-mentioned internal liquid circulation heating composite material curing device, the working process of the internal liquid circulation heating composite material curing device is as follows:

[0017] Install the first sealing cover and the first sealing gasket, the second sealing cover and the second sealing gasket at both ends of the mold respectively to close the mold;

[0018] Connect one end of the first guide tube to the liquid outlet of the liquid heating and pressing machine, and the other end to the third guide tube; connect one end of the second guide tube to the liquid inlet of the liquid heating and pressing machine, and the other end to the fourth guide tube;

[0019] Open the first air guide port cover and the second air guide port cover;

[0020] Injecting liquid medium into the mold from the first guide port, and exhausting gas in the mold from the second guide port; or injecting liquid medium into the mold from the second guide port, and exhausting gas in the mold from the first guide port;

[0021] Laying a thermosetting matrix carbon fiber composite material prepreg on a mold; and laying a vacuum bag and a felt outside the thermosetting matrix carbon fiber composite material prepreg;

[0022] The liquid heating and pressing machine is started to perform cyclic heating control on the liquid medium in the mold until the thermosetting matrix carbon fiber composite material prepreg is completely cured to obtain the thermosetting matrix carbon fiber composite material.

[0023] The present invention has the following advantages:

[0024] (1) The present invention discloses an internal liquid circulation heating composite material curing device. By means of internal liquid circulation heating, the temperature of the material gradually increases from the inner surface to the outside, similar to the effect of bubbles floating up when boiling water, and the internal bubbles are automatically discharged. At the same time, since the temperature of the inner surface is always higher than the temperature of the outer surface, the inside is cured before the outside, and the exhaust process is natural and smooth, which fundamentally solves the problem of processing failure caused by excessive porosity during the curing process.

[0025] (2) The present invention discloses an internal liquid circulation heating composite material curing device, which has a simple structure and an easy-to-operate process. It does not require sophisticated control and only needs to control the liquid heating speed and temperature through a liquid heating pressurizing machine to achieve open-loop control. There is no need to wait for bubbles to be gradually squeezed out, and the curing process is rapid.

[0026] (3) The present invention discloses an internal liquid circulation heating composite material curing device, which is easy to connect and movable, has no special site requirements, and has high compatibility. By adjusting the shape of the sealing cover and the length and number of the guide tubes, it can adapt to the curing needs of various large-sized composite material parts with closed molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an internal liquid circulation heating composite material curing device according to an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 A partial enlarged view of the middle position A;

[0029] Figure 3 It is a schematic diagram of the structural decomposition of an internal liquid circulation heating composite material curing device in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Reference Figures 1 to 3 In this embodiment, the internal liquid circulation heating composite material curing device includes: a liquid heating pressurizing machine 1, a first guide tube 201, a second guide tube 202, a mold 3, a first sealing cover 401, a second sealing cover 402, a first guide port cover 501, a second guide port cover 502, a first sealing gasket 701 and a second sealing gasket 702. The first sealing cover 401 and the second sealing cover 402 are respectively arranged at both ends of the mold 3; the first sealing gasket 701 is arranged between the first sealing cover 401 and the mold 3 to achieve sealing between the first sealing cover 401 and the mold 3; the second sealing gasket 702 is arranged between the second sealing cover 402 and the mold 3 to achieve sealing between the second sealing cover 402 and the mold 3. The first sealing cover 401 is provided with a first flow guide port and a third flow guide port, and the second sealing cover 402 is provided with a second flow guide port and a fourth flow guide port; the first flow guide port is provided with a first flow guide port cover 501, and the second flow guide port is provided with a second flow guide port cover 502; one end of the first flow guide tube 201 is connected to the liquid outlet of the liquid heating and pressing machine 1, and the other end is connected to the third flow guide port; one end of the second flow guide tube 202 is connected to the liquid inlet of the liquid heating and pressing machine 1, and the other end is connected to the fourth flow guide port.

[0032] In this embodiment, the liquid heating and pressing machine 1 is a square finished machine with a movable lower belt roller for circulating heating the liquid medium inside the mold 3 and controlling the heating rate and heating temperature.

[0033] In this embodiment, the first guide tube 201 is matched with the liquid outlet of the liquid heating and pressing machine 1 and the third guide port on the first sealing cover 401 to achieve the connection between the liquid outlet and the third guide port; the second guide tube 202 is matched with the liquid inlet of the liquid heating and pressing machine 1 and the fourth guide port on the second sealing cover 402 to achieve the connection between the liquid inlet and the fourth guide port. Among them, the first guide tube 201 is a circular hose, which is made of high temperature and pressure resistant materials, and has two ends with threads, which can be connected to the third guide port and the liquid outlet through threads. The second guide tube 202 is a circular hose, which is made of high temperature and pressure resistant materials, and has two ends with threads, which can be connected to the fourth guide port and the liquid inlet through threads.

[0034] In this embodiment, the first sealing cover 401 and the second sealing cover 402 are circular metal covers, which are produced and processed in accordance with the shape of the mold 3 and are tightly matched with the openings at both ends of the mold 3. The first sealing cover 401 is processed with a first boss and a third boss, and the first boss and the third boss are respectively provided with a first guide port and a third guide port; the first boss provided with the first guide port is warped upward to facilitate the addition / exhaustion of liquid into the mold 3. The second sealing cover 402 is processed with a second boss and a fourth boss, and the second boss and the fourth boss are respectively provided with a second guide port and a fourth guide port; the second boss provided with the second guide port is warped upward to facilitate the addition / exhaustion of liquid into the mold 3.

[0035] In this embodiment, the first guide port cover 501 is matched with the first guide port and is used to close the first guide port; the second guide port cover 502 is matched with the second guide port and is used to close the second guide port. Among them, the first guide port cover 501 is circular, made of metal as a whole, and is connected to the first guide port by threads. The first guide port cover 501 has a rubber lining inside the cover, which is used to seal the first guide port cover 501 and the first guide port. The second guide port cover 502 is circular, made of metal as a whole, and is connected to the second guide port by threads. The second guide port cover 502 has a rubber lining inside the cover, which is used to seal the second guide port cover 502 and the second guide port.

[0036] In this embodiment, the first sealing gasket 701 and the second sealing gasket 702 are both rubber rings. The first sealing gasket 701 is produced in conjunction with the first sealing cover 401 to seal the gap between the first sealing cover 401 and the mold 3; the second sealing gasket 702 is produced in conjunction with the second sealing cover 402 to seal the gap between the second sealing cover 402 and the mold 3.

[0037] In this embodiment, the internal liquid circulation heating composite material curing device is used for curing the thermosetting matrix carbon fiber composite material prepreg 6, and the specific process is as follows:

[0038] The first sealing cover 401 and the first sealing gasket 701 , the second sealing cover 402 and the second sealing gasket 702 are respectively installed at both ends of the mold 3 to seal the mold 3 .

[0039] One end of the first guide tube 201 is connected to the liquid outlet of the liquid heating and pressing machine 1, and the other end is connected to the third guide port; one end of the second guide tube 202 is connected to the liquid inlet of the liquid heating and pressing machine 1, and the other end is connected to the fourth guide port.

[0040] Open the first air guide port cover 501 and the second air guide port cover 502 .

[0041] Liquid medium is injected into the mold 3 from the first guide port, and gas in the mold 3 is discharged from the second guide port; or liquid medium is injected into the mold 3 from the second guide port, and gas in the mold 3 is discharged from the first guide port.

[0042] The thermosetting matrix carbon fiber composite material prepreg 6 is laid on the mold 3; and a vacuum bag and felt are laid outside the thermosetting matrix carbon fiber composite material prepreg 6.

[0043] The liquid heating and pressing machine 1 is started to perform cyclic heating control on the liquid medium in the mold 3 until the thermosetting matrix carbon fiber composite material prepreg 6 is completely cured to obtain a thermosetting matrix carbon fiber composite material.

[0044] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0045] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. An internal liquid circulation heating composite material curing device, characterized in that: include: A liquid heating and pressing machine (1), a first flow guide tube (201), a second flow guide tube (202), a mold (3), a first sealing cover (401), a second sealing cover (402), a first flow guide port cover (501), a second flow guide port cover (502), a first sealing gasket (701), and a second sealing gasket (702); The first sealing cover (401) and the second sealing cover (402) are respectively arranged at two ends of the mold (3); the first sealing gasket (701) is arranged between the first sealing cover (401) and the mold (3) to achieve sealing between the first sealing cover (401) and the mold (3); the second sealing gasket (702) is arranged between the second sealing cover (402) and the mold (3) to achieve sealing between the second sealing cover (402) and the mold (3); The first sealing cover (401) is provided with a first flow guide port and a third flow guide port, and the second sealing cover (402) is provided with a second flow guide port and a fourth flow guide port; a first flow guide port cover (501) is provided at the first flow guide port, and a second flow guide port cover (502) is provided at the second flow guide port; one end of the first flow guide tube (201) is connected to the liquid outlet of the liquid heating and pressing machine (1), and the other end is connected to the third flow guide port; one end of the second flow guide tube (202) is connected to the liquid inlet of the liquid heating and pressing machine (1), and the other end is connected to the fourth flow guide port.

2. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The internal liquid circulation heating composite material curing device is used for curing thermosetting matrix carbon fiber composite material prepreg (6).

3. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first flow guide port and the second flow guide port are used for adding liquid to the interior of the mold (3) and for exhausting gas.

4. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The liquid heating and pressing machine (1) is used for circulating and heating the liquid medium inside the mold (3) and controlling the heating rate and the heating temperature.

5. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first sealing cover (401) and the second sealing cover (402) are produced and processed in accordance with the outer shape of the mold (3) and are tightly matched with the openings at both ends of the mold (3).

6. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first sealing gasket (701) is produced in conjunction with the first sealing cover (401) and is used to seal the gap between the first sealing cover (401) and the mold (3); the second sealing gasket (702) is produced in conjunction with the second sealing cover (402) and is used to seal the gap between the second sealing cover (402) and the mold (3).

7. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first flow guide pipe (201) is matched with the liquid outlet of the liquid heating and pressing machine (1) and the third flow guide port on the first sealing cover (401) to achieve communication between the liquid outlet and the third flow guide port; the second flow guide pipe (202) is matched with the liquid inlet of the liquid heating and pressing machine (1) and the fourth flow guide port on the second sealing cover (402) to achieve communication between the liquid inlet and the fourth flow guide port.

8. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first flow guide port cover (501) is matched with the first flow guide port and is used to seal the first flow guide port; the second flow guide port cover (502) is matched with the second flow guide port and is used to seal the second flow guide port.

9. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The first sealing gasket (701) and the second sealing gasket (702) are both rubber rings.

10. The internal liquid circulation heating composite material curing device according to claim 1, characterized in that: The working process of the internal liquid circulation heating composite material curing device is as follows: The first sealing cover (401) and the first sealing gasket (701), the second sealing cover (402) and the second sealing gasket (702) are respectively installed at two ends of the mold (3) to seal the mold (3); One end of the first flow guide tube (201) is connected to the liquid outlet of the liquid heating and pressing machine (1), and the other end is connected to the third flow guide port; one end of the second flow guide tube (202) is connected to the liquid inlet of the liquid heating and pressing machine (1), and the other end is connected to the fourth flow guide port; Opening the first air guide port cover (501) and the second air guide port cover (502); Injecting a liquid medium into the mold (3) from the first flow guide port, and the gas in the mold (3) is discharged from the second flow guide port; or injecting a liquid medium into the mold (3) from the second flow guide port, and the gas in the mold (3) is discharged from the first flow guide port; Laying a thermosetting matrix carbon fiber composite material prepreg (6) on the mold (3); and laying a vacuum bag and felt outside the thermosetting matrix carbon fiber composite material prepreg (6); The liquid heating and pressing machine (1) is started to perform cyclic heating control on the liquid medium in the mold (3) until the thermosetting matrix carbon fiber composite material prepreg (6) is completely cured to obtain a thermosetting matrix carbon fiber composite material.

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