NL2030170A - Method and device for laser pretreatment of surfaces of resin matrix composite - Google Patents

Method and device for laser pretreatment of surfaces of resin matrix composite Download PDF

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Publication number
NL2030170A
NL2030170A NL2030170A NL2030170A NL2030170A NL 2030170 A NL2030170 A NL 2030170A NL 2030170 A NL2030170 A NL 2030170A NL 2030170 A NL2030170 A NL 2030170A NL 2030170 A NL2030170 A NL 2030170A
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Netherlands
Prior art keywords
laser
resin matrix
ultraviolet
matrix composite
present
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NL2030170A
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Dutch (nl)
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NL2030170B1 (en
Inventor
Ba Dema
Song Gaowei
Wang Sijie
Li Changqing
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Army Acad Of Armored Forces Of Pla
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/3568—Modifying rugosity
    • B23K26/3584—Increasing rugosity, e.g. roughening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/16—Composite materials, e.g. fibre reinforced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/16—Composite materials, e.g. fibre reinforced
    • B23K2103/166—Multilayered materials
    • B23K2103/172—Multilayered materials wherein at least one of the layers is non-metallic

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Laser Beam Processing (AREA)

Abstract

The present invention provides a method and device for laser pretreatment of surfaces of a resin matrix composite, and relates to the technical field of laser processing. The method for laser pretreatment of surfaces of a resin matrix composite provided by the present invention includes the following step: scanning surfaces of a resin matrix composite with ultraviolet lasers, wherein a wavelength of the ultraviolet lasers is 355 nm. The present invention utilizes the ultraviolet lasers to perform laser pretreatment (including surface cleaning, activation and roughening) of the surface of the resin matrix composite, and limits the wavelength of the ultraviolet lasers to 355 nm. The present invention fulfills the aim of laser cold processing (at a temperature of not higher than 45°C), avoids thermal aggregation from burning the resin matrix composite, and has the advantages of high pretreatment efficiency, high quality, simple operation, and environmental friendliness.

Description

P895/NLpd
METHOD AND DEVICE FOR LASER PRETREATMENT OF SURFACES OF RESIN
MATRIX COMPOSITE
TECHNICAL FIELD
The present invention relates to the technical field of laser processing, and particularly to a method and device for laser pre- treatment of surfaces of a resin matrix composite.
BACKGROUND ART
In the context of “weight loss, acceleration and high relia- bility”, resin matrix composites have been massively applied to carrying tools such as airplanes, ships, warships and vehicles, for example, skins of airplane Boeing 737 are made of a pure car- bon fiber composite. The resin matrix composite is required to re- ceive surface pretreatment in scenarios such as manufacturing, connection, injury repair and cleaning. The surface pretreatment of the resin matrix composite is different from metal surface pre- treatment. Conventional chemical and mechanical methods, sand blasting, etc. fail to meet the requirements for surface pretreat- ment of the resin matrix composite. One the one hand, treatment of the resin matrix composite with mechanical methods and chemical agents is very difficult and toxic, and results in serious pollu- tion. On the other hand, such treatment is lowly efficient, time- consuming, material-consuming, complicated in procedures, and is very likely to cause severe problem of secondary damage to the ma- trix. Therefore, it is necessary to develop more practical, green, low-cost, novel surface pretreatment technologies with high quali- ty.
Laser surface treatment technology is based on an optical system which focuses and shapes a laser beam, and then scans and radiates the surface to be treated. Such technology can give a comprehensive play to multiple effects such as optical pressure, impact pressure, oscillatory wave, plasma burst, etc. The laser processing technology which is used to treat surfaces mechanically or chemically has the advantages of environmental friendliness,
high quality, high efficiency, no secondary damage, simple pro- cess, safety, reliability, easy automation, and low cost in opera- tion and maintenance. Such technology is an ideal technical means for ensuring high-quality, efficient, environmentally friendly pretreatment of the resin matrix composite. Existing commonly used laser pretreatment method is nanosecond laser pretreatment at a wavelength of usually 1064 nm, which causes a relatively severe problem of thermal aggregation on the surface. By such treatment method, the transient temperature at the surface can go beyond 70°C. The resin matrix composite usually malfunctions due to the thermal effect of the lasers.
SUMMARY
An objective of the present invention is to provide a method and device for laser treatment of a resin matrix composite. An ul- traviolet laser source adopted by the present invention can well control the thermal output at a pretreated surface, and minimize degradation of the resin matrix composite by thermal effect of la- sers.
To achieve the above objective, the present invention pro- vides the following technical solution.
The present invention provides a method for laser pretreat- ment of surfaces of a resin matrix composite, including the fol- lowing step: scanning surfaces of a resin matrix composite with ultravio- let lasers, wherein a wavelength of the ultraviolet lasers is 355 nm.
Preferably, the ultraviolet lasers are ultraviolet pulse la- sers.
Preferably, a laser pulse width of the ultraviolet pulse la- sers is 10-20 ns.
Preferably, a repeat frequency of the ultraviolet pulse la- sers is 40-300 kHz.
Preferably, the shape of an ultraviolet laser spot is square or round during laser scanning.
Preferably, when the shape of the ultraviolet laser spot is square, dimensions of the square spot are 3 mm x 3 mm - 6 mm x 6 mm, and an overlapping rate during scanning is 1-3%; and when the shape of the ultraviolet laser spot is round, a diameter of the round spot is 20 - 150 um, and the overlapping rate during scan- ning is 2-5%.
Preferably, laser scanning proceeds at a scanning speed of 600-3000 mm/s, and follows an S-shaped scanning path.
Preferably, the resin matrix composite is a fiber reinforced material which uses an organic polymer as a matrix.
The prevent invention provides a device for the method in the above-mentioned technical solution, including an ultraviolet laser device, a beam modulation system, an optical fiber coupling system and a laser pretreatment stage which are arranged in turn, where- in, in use, the resin matrix composite is placed on the laser pre- treatment stage, and the optical fiber coupling system has an out- put end arranged opposite to a to-be-treated surface of the resin matrix composite.
Preferably, the device further includes an interface tempera- ture monitoring and warning system, wherein the interface tempera- ture monitoring and warning system has a temperature sensing probe arranged at the to-be-treated surface of the resin matrix compo- site.
The present invention provides a method for laser pretreat- ment of surfaces of a resin matrix composite, including the fol- lowing step of: scanning surfaces of a resin matrix composite with ultraviolet lasers, wherein the wavelength of the ultraviolet la- sers is 355 nm. The present invention utilizes the ultraviolet la- sers to perform laser pretreatment (including surface cleaning, activation and roughening) of the surface of the resin matrix com- posite, and limits the wavelength of the ultraviolet lasers to 355 nm. The present invention fulfills the aim of laser cold pro- cessing (at a temperature of not greater than 45°C), avoids ther- mal aggregation from burning the resin matrix composite, and has the advantages of high pretreatment efficiency, high quality, sim- ple operation, and environmental friendliness. The present inven- tion provides an efficient, green, non-destructive, cold- processing method for performing laser pretreatment on surfaces of a resin matrix composite.
BRIEFT DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of a device for laser pretreat- ment of surfaces of a resin matrix composite, in the figure: 1: ultraviolet laser device; 2: low-energy laser beam; 3: beam modu- lation system; 4: shaped high-energy laser beam; 5: ultraviolet laser pretreatment terminal; 6: resin matrix composite; 7: laser pretreatment stage; 8: temperature sensor; 9: “temperature- electrical signal’ converter; 10: signal sensing control system; 11: signal feedback control system; 12: oscilloscope; 13: display and control computer;
FIG. 2 is an SEM photograph of a surface of a carbon fiber reinforced resin matrix composite pretreated by ultraviolet lasers according to Embodiments 1-3;
FIG. 3 is a three-dimensional morphology diagram of the car- bon fiber reinforced resin matrix composite pretreated by ultravi- olet lasers according to Embodiment 1;
FIG. 4 is an SEM photograph of the carbon fiber reinforced resin matrix composite pretreated by ultraviolet lasers according to Embodiment 1.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The present invention provides a method for laser pretreat- ment of surfaces of a resin matrix composite, including the fol- lowing step: scanning surfaces of a resin matrix composite with ultravio- let lasers, wherein a wavelength of the ultraviolet lasers is 355 nm.
According to the present invention, the ultraviolet lasers are ultraviolet pulse lasers. Using ultraviolet pulse lasers with a wavelength of 355 nm, the present invention features short pulse laser wavelength, high processing precision and cold processing, has high energy per photon, can directly break chemical bonds be- tween atoms/molecules of a substance to trigger an optical chemi- cal stripping process, and does not influence substances around.
According to the present invention, the laser pulse width of the ultraviolet pulse lasers is preferably 10-20 ns, and more preferably 12-15 ns; and the repeat frequency of the ultraviolet pulse lasers is preferably 40-300 kHz, more preferably 60-150 kHz.
According to the present invention, the beam mass M2 of the ultra- violet pulse laser is preferably less than 1.3, more preferably 5 1.2, and the beam divergence angle is preferably 2 mrad.
According to the present invention, the shape of the ultravi- olet laser spot during laser scanning is preferably square or round. According specific embodiments of the present invention, the roundness of the round spot is 90%. According to the present invention, the round spot features relatively simple spot modula- tion, reliable spot output and simple corresponding pretreatment process; and the square spot features high energy homogenization, and easy control and calculation of the overlapping rate.
According to the present invention, when the shape of the ul- traviolet laser spot is square, the dimensions of the square spot are preferably 3 mm x 3 mm - 6 mm x 6 mm, and the overlapping rate during scanning is preferably 1-3%; and when the shape of the ul- traviolet laser spot is round, the diameter of the round spot is preferably 20-150 um, more preferably 60-100 um, and the overlap- ping rate during scanning is preferably 2-53.
According to the present invention, the scanning speed of la- ser scanning is preferably 600-3000 mm/s and more preferably 1500- 2600 mm/s; and the scanning path is preferably S-shaped. According to the present invention, the mean output power of laser scanning is preferably 10-50W, more preferably 13-16 W. According to the present invention, the number of laser scanning times is prefera- bly 1. The present invention uses ultraviolet lasers to focus on the surface of the resin matrix composite, and can obtain the pre- treated surface of the resin matrix composite by scanning once.
The present invention imposes no special requirements on the specific components of the resin matrix composite. Resin matrix composites known in the art are all suitable for use in this solu- tion. According to the present invention, the resin matrix compo- site is preferably a fiber reinforced material which uses an or- ganic polymer as the matrix, more preferably a carbon fiber rein- forced epoxy resin matrix composite, aramid fiber reinforced epoxy resin matrix composite, glass fiber reinforced epoxy resin matrix composite or silicon carbide fiber reinforced epoxy resin matrix composite.
By the method provided by the present invention, one or a combination of several ones of pretreatment effects of surface cleaning, activation and roughening on the resin matrix composite can be obtained; the surface shows relatively highly roughness; and the roughening effect is apparent.
The present invention adopts ultraviolet laser radiation for pretreatment, which is simple in process and high in quality and speed, effectively removes substances attached to the matrix sur- face, and dose not damage the resin matrix composite. Moreover, in the process of pretreatment through ultraviolet laser radiation, the present invention does not use chemical reagents, does not generate waste liquids, and belongs to green pretreatment.
The present invention further provides a device for the meth- od in the above-mentioned technical solution. The device includes an ultraviolet laser device, a beam modulating system, an optical fiber coupling system and a laser pretreatment stage which are ar- ranged in turn; in use, the resin matrix composite is placed on the laser pretreatment stage, and the optical fiber coupling sys- tem has an output end arranged opposite to the to-be-treated sur- face of the resin matrix composite.
The device provided by the present invention includes the ul- traviolet laser device. According to the present invention, the ultraviolet laser device is a 355 nm ultraviolet laser device, which features short pulse laser wavelength, high machining preci- sion, cold processing, has high energy per photon, can directly break chemical bonds between atoms/molecules of a substance to trigger optical chemical stripping, and does not influence sub- stances around.
According to the present invention, the ultraviolet laser de- vice preferably includes a laser resonator and a laser transmit- ting terminal. The ultraviolet lasers generated by the laser reso- nator are transmitted by a beam transmission system to the laser transmitting terminal. According to the present invention, the output power of the ultraviolet laser device is preferably 10-50
W, more preferably 13-16 W.
As an embodiment of the present invention, the ultraviolet laser device further includes a parameter control portion. Accord- ing to the present invention, the parameter control portion pref- erably includes a laser power meter, an energy meter, a spectro- graph, an interferometer, an oscilloscope and a related calcula- tion and display system; the parameter control portion is mainly configured to control distribution characteristics of the ultravi- olet lasers in aspects of time, space and spectrum, for example, execution of the laser output power, frequency and pulse width, and technological parameters of the scanning speed.
The device provided by the present invention includes the beam modulation system. The present invention imposes no special requirements on the specific structure of the beam modulation sys- tem. Beam modulation systems known to those skilled in the art can be used. According to the present invention, the beam modulation system is a shaping module of laser beams transmitted by the ul- traviolet laser device.
The device provided by the present invention includes the op- tical fiber coupling system. According to the present invention, the optical fiber coupling system preferably includes an optical fiber coupling assembly, an armored optical fiber assembly and a collimation focusing assembly. According to the present invention, the optical fiber coupling assembly is an interface between a high power laser source and an optical fiber; the ultraviolet lasers outputted by the ultraviolet laser device pass through the optical fiber coupling assembly and then are focused in the core of the optical fiber; and the optical fiber coupling assembly monitors the working state of the optical fiber coupling assembly by pro- cessing safety function instructions from a sensor. The ultravio- let lasers outputted by the ultraviolet laser device pass through the optical fiber coupling system and then enter the optical fi- ber, and an output end of the optical fiber is subjected to nar- rowing of a divergence angle by a collimating lens and then enters a one-dimensional galvanometer scanning system, and finally real- izes laser scanning output.
According to the present invention, the armored optical fiber assembly is preferably a fiber optic cable (QBH); the fiber optic cable is preferably a step-indexed fiber; the fiber core is pref- erably a pure silicon material; and a silicon coating of the fiber is preferably F-type doped; and the standard cross section of the fiber core is preferably round.
As an embodiment of the present invention, the device further includes an ultraviolet laser pretreatment terminal arranged at a tail end of the optical fiber coupling system. According to the present invention, the ultraviolet laser pretreatment terminal is an assembly which controls processing of laser beams outputted for scanning. Such assembly is a hand-held assembly or is mounted on a mobile platform. After the ultraviolet lasers pass through the op- tical fiber coupling system, the outputted laser beams are radiat- ed by the ultraviolet laser pretreatment terminal to the to-be- treated surface of the resin matrix composite for pretreatment.
The device provided by the present invention includes the la- ser pretreatment stage; in use, the resin matrix composite is placed on the laser pretreatment stage, and the optical fiber cou- pling system has an output end arranged opposite to the to-be- treated surface of the resin matrix composite. According to spe- cific embodiments of the present application, the output end of the optical fiber coupling system is arranged directly above the to-be-treated surface of the resin matrix composite. According to specific embodiments of the present application, the ultraviolet laser pretreatment terminal and the surface of the resin matrix composite keep a working distance of 300-1500 mm.
As an embodiment of the present invention, the device provid- ed by the present invention further includes an interface tempera- ture monitoring and warning system; the interface temperature mon- itoring and warning system has a temperature sensing probe ar- ranged at the to-be-treated surface of the resin matrix composite.
The present invention uses the interface temperature monitoring and warning system to regulate the pretreatment progress, which is good for minimizing degradation of the composite surface by a thermal effect of the lasers.
According to the present invention, the interface temperature monitoring and warning system preferably includes a temperature sensing system and a warning system. According to the present in-
vention, a temperature sensing probe of the temperature sensing system measures in real time the temperature of the pretreated surface during laser scanning; when the temperature reaches a set threshold, 45°C, the warning system sends a warning and feeds a signal for stopping laser scanning back to the parameter control portion of the ultraviolet laser device which executes the in- struction of stopping laser scanning.
As an embodiment of the present invention, the temperature sensing system includes a temperature sensor, a “temperature- electrical signal” converter, and a display and control computer; the warning system includes a signal sensing control system, a signal feedback control system, an oscilloscope, and a display and control computer.
As an embodiment of the present invention, the device provid- ed by the present invention further includes a dust cleaning as- sembly. According to the present invention, the dust cleaning as- sembly is positioned around the laser pretreated interface, and moves as the part pretreated by lasers moves to remove chips gen- erated when lasers scan the resin matrix composite.
As an embodiment of the present invention, the device provid- ed by the present invention is shown in FIG. 1. The ultraviolet laser device transmits low-energy laser beams; the low-energy la- ser beams pass through the beam modulation system to form shaped high-energy laser beams which are transmitted by the optical fiber coupling system; and the ultraviolet laser pretreatment terminal scans the to-be-treated surface of the resin matrix composite with the shaped high-energy laser beams to realize pretreatment of the surface of the resin matrix composite. The temperature sensing probe of the interface temperature monitoring and warning system is placed at the to-be-treated surface of the resin matrix compo- site; when the temperature reaches the set threshold, 45°C, the warning system sends a warning and feeds a signal for stopping la- ser scanning to the parameter control portion of the ultraviolet laser device, and then the instruction of stopping laser scanning is executed.
The technical solution of the present invention will be clearly and completely described below with reference to the em-
bodiments of the present invention. It is apparent that the de- scribed embodiments are not all embodiments but part of embodi- ments of the present invention. All other embodiments obtained by those of ordinary skill in the art on the basis of the embodiments in the present invention without creative work fall within the scope of protection of the present invention.
Embodiment 1
Startup of devices and systems: The ultraviolet laser device, the beam modulation system, the optical fiber coupling system, the resin interface monitoring and warning system, and the resin ma- trix composite were arranged, as shown in FIG. 1; the output end of the optical fiber coupling system was arranged opposite to the to-be-treated surface of the resin matrix composite; and the tem- perature sensing probe of the interface temperature monitoring and warning system was placed at the to-be-treated surface of the res- in matrix composite. The ultraviolet laser device was turned on and preheated until the computer displayed a temperature of 10°C, and then the dust cleaning assembly was started.
Selection of the ultraviolet pulse laser parameters: The wavelength of the pulse laser was 355 nm; the repeat frequency was 60 kHz; the laser pulse width was 12 ns; the beam mass M2 was 1.2; the beam divergence angle was 2 mrad; the roundness of the round spot was 90%; and the diameter of the round spot was 60 um.
Selection of pulse laser scanning parameters: The scanning speed was 150 cm/s, and the overlapping rate during scanning was 2%; the mean output power was 10 W; the temperature sensing system measured in real time the temperature of the pretreated surface during laser scanning; when the temperature reached the set threshold, 45°C, the warning system sent a warning and fed a sig- nal for stopping laser scanning back to the parameter control por- tion of the ultraviolet laser device, and then the instruction of stopping laser scanning was executed.
The ultraviolet lasers were focused on the surface of the resin matrix composite to scan the surface once by an S-shaped path in a reciprocating way, and then the pretreated surface of the resin matrix composite was obtained.
Embodiment 2
The method of Embodiment 2 is substantially the same as that of Embodiment 1 except that the mean output power of pulse laser scanning is adjusted from “OW” to “13W".
Embodiment 3
The method of Embodiment 3 is substantially the same as that of Embodiment 1 except that the mean output power of pulse laser scanning is adjusted from “10W” to “IGW”.
Test example 1
The SEM photographs of the pretreated surface of the carbon fiber reinforced resin matrix composite in Embodiments 1-3 are shown in FIG. 2. In FIG. 2, (a) represents Embodiment 1, (b) rep- resents Embodiment 2, and (c) represents Embodiment 3.
From FIG. 2, it can be seen that cuts in an area after abla- tion processing of three laser parameters are regular, no obvious heat-affected area is found, and the surface resin is not obvious- ly vaporized as the output power of the ultraviolet laser increas- es. This is because the principle of the ultraviolet laser pro- cessing is different from that of the infrared laser processing.
In this process, heat input is low, so ultraviolet laser scanning is called “cold processing”, which can avoid degradation of the resin matrix composite surface by the thermal effect of lasers.
Test example 2
The three-dimensional morphology diagram of the carbon fiber reinforced resin matrix composite pretreated with ultraviolet la- sers in Embodiment 1 is shown in FIG. 3. From FIG. 3, it can be seen that the surface roughness Ra of the pretreated carbon fiber reinforced resin matrix composite is 2.7 um, so that the pretreat- ed carbon fiber reinforced resin matrix composite has relatively high roughness. Use of the pretreatment method of the present in- vention helps repair the pretreated part (for example, gluing, pre-assembling, etc.).
Test example 3
The SEM photograph of the carbon fiber reinforced resin ma- trix composite pretreated with ultraviclet lasers in Embodiment 1 is shown in FIG. 4. From FIG. 4, it can be seen that the carbon fiber reinforced resin matrix composite pretreated using the pre-
sent invention has surface resin completely removed and carbon fi- bers completely exposed, but the fibers remain in good conditions and are free of destructions such as breakage, missing etc. This proves that laser pretreatment is a non-destructive pretreatment method.
The present invention provides a new method for large-scale, high-quality, accurately controllable pretreatment of the surface of the resin matrix composite.
The above embodiments are merely preferable embodiments of the present invention. It should be noted that those skilled in the art may further make a plurality of improvements and modifica- tions without departing from the concept of the present invention and all of these fall within the scope of protection of the pre- sent invention.

Claims (10)

CONCLUSIESCONCLUSIONS 1. Werkwijze voor voorbehandeling met een laser van oppervlakken van een composiet van een harsmatrix, met het kenmerk, dat deze de volgende stap omvat: het scannen van oppervlakken van een composiet van een harsmatrix met ultraviolette lasers, waarbij een golflengte van de ultraviolette lasers 355 nm is.A method of laser pretreatment of surfaces of a resin matrix composite, characterized in that it comprises the step of: scanning surfaces of a resin matrix composite with ultraviolet lasers, wherein a wavelength of the ultraviolet lasers is 355 nm is. 2. Werkwijze volgens conclusie 1, met het kenmerk, dat de ultravi- olette lasers ultraviolette pulslasers zijn.A method according to claim 1, characterized in that the ultraviolet lasers are pulsed ultraviolet lasers. 3. Werkwijze volgens conclusie 2, met het kenmerk, dat een laser- pulsbreedte van de ultraviolette pulslasers 10-20 ns is.A method according to claim 2, characterized in that a laser pulse width of the ultraviolet pulse lasers is 10-20 ns. 4. Werkwijze volgens conclusie 2, met het kenmerk, dat de herha- lingsfrequentie van de ultraviolette pulslasers 40-300 kHz is.A method according to claim 2, characterized in that the repetition frequency of the ultraviolet pulse lasers is 40-300 kHz. 5. Werkwijze volgens conclusie 1 of 2, met het kenmerk, dat de vorm van een ultraviolette laservlek bij laserscanning vierkant of rond is.A method according to claim 1 or 2, characterized in that the shape of an ultraviolet laser spot in laser scanning is square or round. 6. Werkwijze volgens conclusie 5, met het kenmerk, dat wanneer de vorm van de ultraviolette laservlek vierkant is, de afmetingen van de vierkante vlek 3 mm x 3 mm - 6 mm x 6 mm zijn, en een mate van overlapping tijdens het scannen 1- 3% is; en wanneer de vorm van de ultraviolette laservlek rond is, de diameter van de ronde vlek 20 — 150 pm is en de mate van overlapping tijdens het scannen 2-5%The method according to claim 5, characterized in that when the shape of the ultraviolet laser spot is square, the size of the square spot is 3mm x 3mm - 6mm x 6mm, and a degree of overlapping during scanning is 1 - 3%; and when the shape of the ultraviolet laser spot is round, the diameter of the round spot is 20—150 µm, and the degree of overlapping during scanning is 2-5% is.is. 7. Werkwijze volgens conclusie 1 of 2, met het kenmerk, dat het laserscannen verloopt met een scansnelheid van 600-3000 mm/s, en een S-vormig scanpad volgt.A method according to claim 1 or 2, characterized in that the laser scanning proceeds at a scanning speed of 600-3000 mm/s and follows an S-shaped scanning path. 8. Werkwijze volgens een van de conclusies 1, met het kenmerk, dat de composiet van de harsmatrix een vezelversterkt materiaal is dat een organisch polymeer als matrix gebruikt.A method according to any one of claims 1, characterized in that the composite of the resin matrix is a fiber-reinforced material using an organic polymer as a matrix. 9. Inrichting voor het uitvoeren van de werkwijze volgens een van de conclusies 1-8, met het kenmerk, dat deze omvat een ultraviolet laserapparaat, een bundelmodulatiesysteem, een optische vezel- koppelingssysteem en een laservoorbehandelingstrap die op hun beurt zijn opgesteld, waarbij tijdens gebruik, de composiet van de harsmatrix op de laservoorbehandelingsfase wordt geplaatst; en het optische vezel-koppelingssysteem een uitgangsuiteinde heeft dat is opgesteld tegenover een te behandelen oppervlak van de composiet van de harsmatrix.An apparatus for carrying out the method according to any one of claims 1 to 8, characterized in that it comprises an ultraviolet laser device, a beam modulation system, an optical fiber coupling system and a laser pre-treatment stage arranged in turn, wherein during use , the resin matrix composite is placed on the laser pretreatment stage; and the optical fiber coupling system has an exit end disposed opposite a surface to be treated of the composite of the resin matrix. 10. Inrichting volgens conclusie 9, met het kenmerk, dat deze ver- der een bewakings- en waarschuwingssysteem voor de temperatuur van de interface omvat, waarbij het bewakings- en waarschuwingssysteem voor de temperatuur van de interface een temperatuurvoelende sonde heeft die is aangebracht op het te behandelen oppervlak van de composiet van de harsmatrix.An apparatus according to claim 9, characterized in that it further comprises an interface temperature monitoring and warning system, the interface temperature monitoring and warning system having a temperature sensing probe mounted on the surface to be treated of the resin matrix composite.
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