CN216267735U - Device for repairing composite material - Google Patents
Device for repairing composite material Download PDFInfo
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- CN216267735U CN216267735U CN202121576642.8U CN202121576642U CN216267735U CN 216267735 U CN216267735 U CN 216267735U CN 202121576642 U CN202121576642 U CN 202121576642U CN 216267735 U CN216267735 U CN 216267735U
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Abstract
The utility model relates to a device for repairing a composite material, belongs to the technical field of composite material surface treatment, and solves the problem that the existing mechanical excavation method is easy to cause certain damage to the repaired strength; when the existing composite material hot patching instrument is used for curing, the curing time is long, and the repairing efficiency is low. The device for repairing the composite material comprises a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot repair instrument; the laser can emit laser for removing the mechanical damage layer of the composite material; the ultrasonic device provides ultrasonic irradiation for the composite material hot patching instrument during repairing of the area to be repaired of the composite material. The device for repairing the composite material can remove a mechanical damage layer generated by mechanical excavation when repairing the to-be-repaired area of the composite material, activate an interface, provide ultrasonic irradiation, shorten curing time, improve repairing efficiency and improve repairing effect.
Description
Technical Field
The utility model belongs to the technical field of composite material surface repair, and particularly relates to a device for repairing a composite material.
Background
The advanced resin-based composite material has the advantages of high specific strength, high specific rigidity, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability, capability of realizing structural/functional integration, convenience for large-area integral forming and the like, is rapidly applied to the fields of spacecrafts, airplanes, ships, high-speed trains, automobiles and the like, partially replaces aluminum alloy and steel, and becomes one of the most rapidly developed advanced materials in equipment structural materials. One of the major problems impeding further use of advanced composite materials is the repair of damaged composite structures. The damage form of the composite material is usually manifested as delamination, fiber breakage, holes, etc.
The composite material cementing repair process has the advantages of no formation of new stress concentration, no obvious increase of the structure weight, good fatigue resistance after repair and the like, and is the key point of the research on the composite material structure damage repair technology. At present, the traditional process method is mainly used in the repair of damage and defects of composite materials of equipment such as airplanes and the like in China, namely, mechanical polishing processing and pretreatment are adopted, then prepreg sticking and packaging are carried out by adopting a patching or patching method, and finally a composite material hot patching instrument is adopted for heating and curing. The surface of the composite material is easily subjected to secondary damage in the process of mechanically polishing and excavating the damaged area, the repaired strength is reduced to a certain extent, and the interface bonding strength of the repaired composite material is low; when the existing composite material hot patching instrument is used for curing, the curing time is long, and the repairing efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention provides an apparatus for repairing composite material, which can solve at least one of the following technical problems: (1) the mechanical excavation method is easy to cause secondary damage to the surface of the composite material, certain damage is caused to the repaired strength, and the interface bonding strength of the repaired composite material is low; (2) when the existing composite material hot patching instrument is used for curing, the curing time is long, and the repairing efficiency is low.
In order to solve the problems, the technical scheme adopted by the utility model is as follows:
the utility model provides a device for repairing a composite material, which comprises a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot repair instrument, wherein the laser is arranged on the surface of the composite material;
the laser can emit laser for removing the mechanical damage layer of the composite material; the low-temperature plasma surface treatment equipment is used for spraying plasma to the surface of the composite material to realize surface pretreatment;
the composite material repair area is located in an ultrasonic irradiation area of the ultrasonic device, and the ultrasonic device provides ultrasonic irradiation for the composite material hot repair instrument when repairing the composite material repair area.
Further, the laser is capable of emitting ultraviolet laser light.
Further, the wavelength of the ultraviolet laser is 355 nm.
Further, the ultrasonic device comprises an ultrasonic controller and an ultrasonic transducer.
Further, the number of the ultrasonic transducers is multiple.
Furthermore, the ultrasonic transducer adopts a longitudinal wave probe, the power of the probe is 100W, and the frequency is 28 KHz.
Further, the composite material hot patching instrument comprises a display unit, a control unit and a vacuumizing device; the control unit comprises a temperature control unit, a vacuum control unit and an ultrasonic control unit.
Furthermore, the temperature control unit comprises a temperature measurement component, a heating controller and a vacuum pressure sensor.
Further, the vacuum control unit includes a vacuum pressure sensor.
Further, the ultrasonic controller is connected with the ultrasonic control unit, and the ultrasonic controller performs ultrasonic application and time control according to the data instruction of the ultrasonic control unit.
Furthermore, the ultrasonic irradiation assisted composite material repairing device also comprises demoulding cloth, a heating blanket and an air-permeable felt; the demolding cloth, the heating blanket and the air-permeable felt are used for packaging the area to be repaired (namely the repair area during repair) of the composite material.
Compared with the prior art, the utility model can realize at least one of the following beneficial effects:
(1) the device for repairing the composite material comprises a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot patching instrument, wherein the laser can emit ultraviolet laser, after a damaged area of the composite material is dug out by adopting a mechanical digging method, the interface after the dug-out is scanned for many times by adopting the ultraviolet laser, a mechanical damaged layer generated by mechanical digging is removed, carbon fibers in the composite material are exposed, and the ultraviolet laser does not damage the carbon fibers, so that an adhesive can be directly contacted with the carbon fibers in the subsequent gluing process, and the gluing effect is improved; the low-temperature plasma surface treatment equipment can activate the glue joint interface by adopting plasma after laser scanning, can effectively improve the roughness of the glue joint surface, increase the surface activity, increase oxygen-containing active functional groups, improve the proportion of chemical bonds of the glue joint interface, and improve the interface bonding strength and the final maintenance effect of a maintenance matrix and a patch.
(2) The ultrasonic device of the device for repairing the composite material can provide ultrasonic irradiation when the composite material hot-repair instrument repairs the area to be repaired of the composite material, the ultrasonic irradiation acts in the liquid resin to break bubbles, and simultaneously generates high temperature and high pressure, so that a uniform blending system is achieved, the viscosity of the resin is reduced, the contact angle is reduced, the wetting performance of the resin and fibers is improved, the bonding strength is improved, and the curing time is shortened (for example, the curing time of the used epoxy system prepreg is reduced from the existing 150min to 130 min).
(3) The device for repairing the composite material has the advantages that the number of the ultrasonic transducers is multiple, so that the ultrasonic waves can be uniformly applied when the area to be repaired is large, and the action effect of the ultrasonic waves is further ensured.
(4) After the device for repairing the composite material is used for repairing the composite material, the tensile shear strength of the interface among the patch, the mother board and the adhesive film of the composite material reaches 38.3Mpa, which is improved by more than 38% compared with the direct repair strength of 26.3Mpa after the existing mechanical excavation, and the repair quality is obviously improved, and the uniformity of the shear strength of the interface among the patch, the mother board and the adhesive film of the composite material is better.
In the utility model, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of an apparatus for repairing composite materials;
FIG. 2 is a schematic structural view of a composite material to be repaired;
FIG. 3 is a schematic view after packaging;
fig. 4 is a schematic view of the propagation of ultrasonic waves during the repair process.
Reference numerals
1-patching, 2-mother board, 3-adhesive film, 4-area to be repaired, 5-demoulding cloth, 6-heating blanket, 7-air-permeable felt, 8-vacuum bag, 9-vacuum nozzle, 10-vacuum meter, 11-temperature measuring component, 12-computer display, 13-PLC control unit, 14-ultrasonic controller, 15-ultrasonic transducer, 16-vacuum pressure sensor, 17-vacuum pump, 18-heating controller and 19-vacuumizing connector.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the utility model serve to explain the principles of the utility model and not to limit its scope.
At present, the structural damage of the composite material is mostly repaired by adopting a glue joint repairing process, the glue joint repairing process comprises 2 repairing modes of patching and patching, for example, patching repair is carried out, the damaged part is firstly dug out in the patching repair, and then glue films and patches are sequentially pasted for repairing. The repair of the excavation and repair can well restore the pneumatic appearance of the component, basically does not generate repair stress, does not have load eccentricity, and is a commonly adopted repair method in the repair of the composite material structure at present. As shown in fig. 2, which is a schematic structural diagram of a composite material to be repaired, an adhesive film 3 is located between a patch 1 and a mother board 2 of the composite material, and the adhesive film 3 generally bears shear and transverse tension and compression loads, and the failure modes are peel failure and shear failure. The patching repair is expected to exert the bearing capacity of the mother board 2, the adhesive film 3 and the patch 1, so that the overall performance of the repair structure is recovered to the maximum extent. In the repairing process, the bonding strength among the mother board 2, the adhesive film 3 and the patch 1 directly influences the whole repairing effect. At present, the damaged part of the composite material structure is generally machined into a conical slope with a certain length-thickness ratio by a mechanical method, secondary damage is easily caused to the surface of the composite material in the process, and certain damage is also caused to the repaired strength; at present, a composite material hot-repair instrument is directly adopted to repair in the bonding repair process, and when the existing composite material hot-repair instrument is cured, the curing time is long, and the repair efficiency is low.
Example 1
The embodiment provides a device for repairing a composite material, which comprises a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot-repair instrument, as shown in fig. 1; the laser can emit laser for removing the mechanical damage layer of the composite material; the low-temperature plasma surface treatment equipment is used for spraying plasma to the surface of the composite material to realize surface pretreatment; the composite material to-be-repaired area is located in the ultrasonic irradiation area of the ultrasonic device, and the ultrasonic device provides ultrasonic irradiation for the composite material hot repair instrument when repairing the composite material to-be-repaired area.
Specifically, the laser can emit ultraviolet laser with the wavelength of 355 nm. After the damaged area of the composite material is excavated by a mechanical excavation method, the excavated interface is scanned for multiple times by ultraviolet laser, and a mechanical damage layer generated by mechanical excavation is removed.
Specifically, the low-temperature plasma surface treatment equipment can activate the bonding interface by adopting plasma after laser scanning.
Specifically, the ultrasonic device includes an ultrasonic controller 14 and an ultrasonic transducer 15.
Specifically, the number of the ultrasonic transducers 15 is controlled to be plural, for example, 2, in consideration that the ultrasonic application of the single ultrasonic transducer 15 may be uneven when the area to be repaired of the composite material is large.
Specifically, the ultrasonic transducer 15 uses a longitudinal wave probe with a probe power of 100W and a frequency of 28 KHz.
Specifically, the composite material hot patching instrument comprises a display unit, a control unit and a vacuumizing device; the control unit comprises a temperature control unit, a vacuum control unit and an ultrasonic control unit.
Specifically, the temperature control unit includes a temperature measuring assembly 11 and a heating controller 18.
Specifically, the vacuum control unit includes a vacuum pressure sensor 16.
Specifically, the display unit may be a computer monitor 12.
Specifically, the control unit may be a PLC control unit 13.
Specifically, the vacuum pumping device comprises a vacuum nozzle 9, a vacuum meter 10, a vacuum pump 17, a vacuum bag 8, a vacuum pumping hose and a vacuum pumping joint 19; the vacuum bag 8 is hermetically communicated with a vacuumizing connector 19, and the vacuumizing connector 19 is connected with a vacuum pump 17 through a vacuumizing hose; the PLC control unit 13 can realize the following functions: controlling heating temperature and heating time; vacuumizing and controlling the vacuum degree; ultrasonic waves are applied and time control is performed.
Specifically, the PLC control unit 13 directs the vacuum pumping device to perform vacuum pumping and vacuum degree control according to the detection data of the vacuum pressure sensor 16; the PLC control unit 13 guides the heating controller 18 to work according to the detection data of the temperature measuring component 11.
Specifically, the ultrasonic controller 14 is connected to an ultrasonic control unit of the PLC control unit 13, and the ultrasonic controller 14 performs ultrasonic application and time control according to a data command of the ultrasonic control unit.
Specifically, the PLC control unit 13 further includes a current sensor.
Specifically, the composite material hot repair instrument further comprises a demolding cloth 5, a heating blanket 6 and an air-permeable felt 7, wherein the demolding cloth 5, the heating blanket 6 and the air-permeable felt 7 are used for packaging the area to be repaired of the composite material.
Specifically, the temperature measuring assembly 11 includes a plurality of thermocouples.
When the device for repairing the composite material is used for repairing the composite material, the method for repairing the composite material comprises the following steps: removing an interface damage part generated by excavating a damage part of the composite material by adopting laser; activating the cementing interface by adopting low-temperature plasma; when the prepreg is bonded and repaired, ultrasonic irradiation is adopted in the curing stage.
Compared with the prior art, the device for repairing the composite material comprises a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot patching instrument, wherein the laser can emit ultraviolet laser, after a damaged area of the composite material is dug out by adopting a mechanical digging method, the interface after the dug-out is scanned for many times by adopting the ultraviolet laser, a mechanical damage layer generated by mechanical digging is removed, internal carbon fibers are exposed, the ultraviolet laser does not damage the carbon fibers, so that an adhesive can be directly contacted with the carbon fibers in the subsequent gluing process, and the gluing effect is improved; the low-temperature plasma surface treatment equipment can activate the glue joint interface by adopting plasma after laser scanning, can effectively improve the roughness of the glue joint surface, increase the surface activity, increase oxygen-containing active functional groups, improve the proportion of chemical bonds of the glue joint interface, and improve the interface bonding strength and the final maintenance effect of a maintenance matrix and a patch.
The ultrasonic device can provide ultrasonic irradiation when the composite material hot-repair instrument repairs the area to be repaired of the composite material, the ultrasonic irradiation acts in the liquid resin to break bubbles and generate high temperature and high pressure, so that a homogenizing and blending system is achieved, the viscosity of the resin is reduced, the contact angle is reduced, the infiltration performance of the resin and fibers is improved, the bonding strength is improved, and the curing time is shortened (the curing time of the prepreg of the used epoxy system is reduced from the existing 150min to 130 min).
The device for repairing the composite material has the advantages that the number of the ultrasonic transducers is multiple, so that the ultrasonic waves can be uniformly applied when the area to be repaired is large, and the action effect of the ultrasonic waves is further ensured.
After the device for repairing the composite material is used for repairing the composite material, the tensile shear strength of the interface among the patch, the mother board and the adhesive film of the composite material reaches 38.3Mpa, which is improved by more than 38% compared with the direct repair strength of 26.3Mpa after the existing mechanical excavation, and the repair quality is obviously improved, and the uniformity of the shear strength of the interface among the patch, the mother board and the adhesive film of the composite material is better.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The device for repairing the composite material is characterized by comprising a laser, low-temperature plasma surface treatment equipment, an ultrasonic device and a composite material hot repair instrument;
the laser can emit laser for removing the mechanical damage layer of the composite material;
the low-temperature plasma surface treatment equipment is used for spraying plasma to the surface of the composite material to realize surface pretreatment;
the composite material repair area is located in an ultrasonic irradiation area of the ultrasonic device, and the ultrasonic device provides ultrasonic irradiation for the composite material hot repair instrument when repairing the composite material repair area.
2. The apparatus for repairing a composite material of claim 1, wherein said laser is an ultraviolet laser having a wavelength of 355 nm.
3. Device for repairing composite materials according to claim 1, characterized in that said ultrasonic device comprises an ultrasonic controller (14) and an ultrasonic transducer (15).
4. Device for repairing composite materials according to claim 3, characterized in that said ultrasonic transducer (15) is present in a plurality.
5. Device for repairing composite materials according to claim 3, characterized in that the ultrasonic transducer (15) uses a longitudinal wave probe.
6. The apparatus for repairing a composite material according to claim 3, wherein said composite material hot-repair apparatus comprises a display unit, a control unit and a vacuum-pumping device; the control unit comprises a temperature control unit, a vacuum control unit and an ultrasonic control unit.
7. Device for repairing composite materials according to claim 6, characterized in that said temperature control unit comprises a thermometric assembly (11) and a heating controller (18).
8. Device for repairing composite materials according to claim 6, characterized in that said vacuum control unit comprises a vacuum pressure sensor (16).
9. The apparatus for repairing composite material according to claim 6, wherein said ultrasonic controller (14) is connected to an ultrasonic control unit, and the ultrasonic controller (14) performs ultrasonic application and time control according to data commands of the ultrasonic control unit.
10. The device for repairing composite materials according to claim 1, further comprising a release cloth (5), a heating blanket (6) and an air felt (7); the demolding cloth (5), the heating blanket (6) and the air-permeable felt (7) are used for encapsulating the area to be repaired of the composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121576642.8U CN216267735U (en) | 2021-07-12 | 2021-07-12 | Device for repairing composite material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121576642.8U CN216267735U (en) | 2021-07-12 | 2021-07-12 | Device for repairing composite material |
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| CN216267735U true CN216267735U (en) | 2022-04-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749867A (en) * | 2022-05-04 | 2022-07-15 | 国营芜湖机械厂 | Repair method suitable for high-temperature titanium alloy structure cracks |
| CN115091794A (en) * | 2022-07-28 | 2022-09-23 | 大连理工大学 | Method for repairing damage of thermoplastic composite material |
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2021
- 2021-07-12 CN CN202121576642.8U patent/CN216267735U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749867A (en) * | 2022-05-04 | 2022-07-15 | 国营芜湖机械厂 | Repair method suitable for high-temperature titanium alloy structure cracks |
| CN115091794A (en) * | 2022-07-28 | 2022-09-23 | 大连理工大学 | Method for repairing damage of thermoplastic composite material |
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