A method for laser low-damage processing of carbon fiber composite materials

Abstract

The present invention provides a method for laser low-damage processing of carbon fiber composite materials. The present invention includes a platform frame, a protective liquid tank is provided below the platform frame, a processing box is connected to the upper surface of the platform frame, and an air inlet and an air outlet are provided through the processing box. Through the mutual cooperation between the processing box, the air inlet, the air outlet and the processing platform, the workpiece to be processed is placed on the processing platform in the processing box, the protective gas is input into the air inlet, and the air in the processing box is squeezed out, so that a nearly oxygen-free environment is formed in the processing box, which can effectively suppress the combustion phenomenon generated during laser processing of CFRP, and can also reduce the problems of material pyrolysis and harmful gas release, play a protective role on the material to be processed, and can also study the thermal damage law of mixed gases with different oxygen content ratios. A liquid jet injection device that can move synchronously with the laser cutting head is designed in the working container to achieve the purpose of synchronous cooling and flushing.

Description

Technical Field

[0001] The invention relates to the technical field of composite laser processing, in particular to a method for laser low-damage processing of carbon fiber composite materials. Background Art

[0002] With the increasing market demand for lightweight structures, composite materials have become a development trend for civilian and military products. Carbon fiber reinforced composite materials (CFRP), as advanced high-performance composite materials, have excellent mechanical properties such as high specific strength, high specific modulus, corrosion resistance, and good fatigue resistance. They are widely used in aerospace, automotive industry, medical equipment, sporting goods, national defense and other fields. CFRP is mainly composed of reinforcing carbon fiber and matrix resin. The two have very different physical properties such as force, heat, electricity, and light. CFRP has anisotropy, inhomogeneity, high wear resistance and great differences between the two materials.

[0003] CFRP is mainly composed of reinforcing carbon fiber and matrix resin, which have very different physical properties such as force, heat, electricity, and light. At the same time, CFRP has anisotropy, inhomogeneity, high wear resistance, and large differences between the two materials, which leads to problems such as excessive tool wear, fiber breakage, material delamination, microcracks, and deterioration of mechanical properties during processing in traditional mechanical processing methods. Laser processing of CFRP is an effective alternative method. Compared with traditional mechanical processing, laser processing has the advantages of narrow cutting slits, high cutting speeds, high automation, and no cutting force. However, the excess heat accumulation in laser processing can lead to thermal damage problems such as large heat-affected zones, fiber pullout, delamination, and fiber end expansion. In addition, laser processing in an air environment will inevitably lead to material pyrolysis and combustion, while releasing harmful gases and aggravating material thermal damage. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a method for laser low-damage processing of carbon fiber composite materials, which can suppress the combustion phenomenon generated during laser processing of CFRP and reduce the thermal damage problem during laser processing. At the same time, it can wash away the residues and partial pyrolysis products generated by laser processing of CFRP, reducing pollution to the atmosphere.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for laser low-damage processing of carbon fiber composite materials, comprising a platform frame, a protective liquid tank is provided under the platform frame, a processing box is connected to the upper surface of the platform frame, an air inlet and an air outlet are penetrated through the processing box, a processing platform for placing the material to be processed is fixedly installed at the bottom of the processing box, the processing box is connected to the protective liquid tank through a reflux pipe, the inner wall of the processing box is connected to a water jet nozzle through an axial adjustment mechanism, and the protective liquid tank is connected to a liquid guide mechanism connected to the water jet nozzle.

[0008] Preferably, two air outlets are provided, and the two air outlets are staggered up and down.

[0009] Preferably, the processing box comprises a main box body, a main box cover and a high-transmittance plane mirror. The main box cover is used in conjunction with the main box body, and the high-transmittance plane mirror is embedded through the top center of the main box cover.

[0010] Preferably, the axial adjustment mechanism includes two Y-axis electric slide rails fixedly connected to the inner wall of the processing box, the two Y-axis electric slide rails are arranged horizontally at the same height, the two Y-axis electric slide rails are respectively connected to the X-axis electric slide rails through flange sliders, the X-axis electric slide rails are connected to the movable bracket through the flange slider, the side wall of the movable bracket is fixedly installed with a No. 1 servo, the No. 1 servo driving end is connected to the servo bracket with the No. 2 servo through a rudder arm using bolts, and the water jet nozzle and the No. 2 servo driving end are connected to the water jet nozzle through the rudder arm.

[0011] Preferably, the Y-axis electric slide rail includes two tracks and a stepper motor. The stepper motor is fixedly connected to the outer wall of the processing box, and the two tracks are fixedly connected to the inner wall of the processing box. Both ends of the two tracks are rotatably installed with a rotating shaft through a bearing seat. The output shaft of the stepper motor is connected to the rotating shaft through a synchronous belt, and the two rotating shafts are connected through two synchronous belts. The X-axis electric slide rail includes a track and a stepper motor. Two movable sliders are fixedly connected to the bottom of the track, and the two movable sliders are respectively fixedly connected to the two synchronous belts. A mounting shaft is rotatably installed on the side wall of the track. The mounting shaft is connected to the output shaft of the stepper motor through a synchronous belt, and the movable bracket is fixedly installed on the synchronous belt.

[0012] Preferably, the liquid guiding mechanism comprises a water pump disposed in the protective liquid tank, the water outlet of the water pump is connected to an infusion hose, the end of the infusion hose away from the water pump passes through the protective liquid tank and the processing tank and is connected to the water jet nozzle.

[0013] Preferably, a microporous filter plate is fixedly connected to the inner wall of the protection liquid tank, and the water pump and the reflux pipe are respectively located on both sides of the microporous filter plate.

[0014] A method for laser low-damage processing of carbon fiber composite materials, comprising the following steps:

[0015] S1. Install the device to one side of the laser processor, open the main box cover, place the material to be laser processed on the processing platform, and close the main box cover;

[0016] S2. Connect the air inlet to the air supply device filled with protective gas. After the air supply device is turned on, the protective gas enters the processing box through the air inlet. If the density of the filled protective gas is greater than that of air, open the air outlet located at the top, and the mixture of air and protective gas in the processing box is continuously discharged outward through the air outlet located at the top. If the density of the filled protective gas is less than that of air, open the air outlet located at the bottom, and the mixture of air and protective gas in the processing box is continuously discharged outward through the air outlet located at the bottom. The oxygen content in the processing box is continuously reduced and a dynamic air supply processing space is formed;

[0017] S3, starting the laser processor, the laser emitted by the laser processor passes through the high-transmittance plane mirror and starts cutting the workpiece to be processed according to a predetermined route;

[0018] S4. While laser cutting is being performed, a liquid jet processing path is obtained by delaying the laser processing path obtained by the built-in CPU of the laser processor, that is, a moving path of the water jet nozzle is obtained, and a water pump is started. The water pump draws the protective liquid in the protective liquid tank into the liquid infusion hose. The protective liquid in the liquid infusion hose is sprayed toward the workpiece being processed through the water jet nozzle to cool and flush the workpiece;

[0019] S5. The protective liquid in the processing box flows back to the protective liquid tank through the reflux pipe to realize the protective liquid circulation. After the workpiece processing is completed, turn off the water pump and the laser processor, open the main box cover, and take out the cooled workpiece.

[0020] Preferably, the protective gas in S2 is one or more of nitrogen, argon and helium.

[0021] Preferably, the protective solution in S4 is water or anhydrous ethanol solution.

[0022] (III) Beneficial effects

[0023] The present invention provides a method for laser low-damage processing of carbon fiber composite materials. It has the following beneficial effects:

[0024] 1. Through the cooperation between the processing box, air inlet, air outlet and processing platform, the workpiece to be processed is placed on the processing platform in the processing box, and the protective gas is input into the air inlet. The air in the processing box is squeezed out, so that a nearly oxygen-free environment is formed in the processing box. This can effectively suppress the combustion phenomenon caused by laser processing of CFRP, and can also reduce the problems of material pyrolysis and harmful gas release, which plays a protective role on the material to be processed. At the same time, the thermal damage law of mixed gases with different oxygen content ratios can also be studied. In addition, a liquid jet injection device that can move synchronously with the laser cutting head is designed in the working container to achieve the dual effects of synchronous cooling and flushing.

[0025] 2. Through the cooperation among the protective liquid tank, processing box, axial adjustment mechanism, water jet nozzle and liquid guiding mechanism, the liquid guiding mechanism pumps the protective liquid in the protective liquid tank into the water jet nozzle. The protective liquid sprayed from the water jet nozzle flushes the workpiece, flushes away the residue and part of the pyrolysis products generated by the laser processing of CFRP, reduces the thermal damage problems such as fiber pull-out, delamination, fiber end expansion, etc. in laser processing, and also reduces air pollution.

[0026] 3. Through the cooperation between the protective liquid tank, processing box, reflux pipe and microporous filter plate, the protective liquid after flushing the workpiece in the processing box flows back to the protective liquid tank through the reflux pipe for recycling, and the microporous filter plate can filter the protective liquid entering the water pump to prevent residues from entering the water pump and causing damage to the water pump, thereby protecting the water pump and the water jet nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0028] Figure 2 A front view of a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0029] Figure 3 A top view of a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0030] Figure 4 A schematic diagram of the three-dimensional structure of a processing box in a device for low-damage laser processing of carbon fiber composite materials proposed by the present invention;

[0031] Figure 5 A schematic diagram of the structure of a processing box in a device for low-damage laser processing of carbon fiber composite materials proposed by the present invention;

[0032] Figure 6 A schematic diagram of the connection structure between the axial adjustment mechanism and the water jet nozzle in a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0033] Figure 7 A schematic diagram of the connection structure between a liquid guide mechanism and a water jet nozzle in a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0034] Figure 8 A schematic diagram of the internal structure of a protective liquid tank in a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0035] Fig. 9 A schematic diagram of the connection structure between the Y-axis electric slide rail and the X-axis electric slide rail in a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0036] Fig.10 A cross-sectional view of a device for laser low-damage processing of carbon fiber composite materials proposed by the present invention;

[0037] Fig.11 Schematic diagram of jet thin water layer assisted laser processing;

[0038] Fig.12 It is a structural schematic diagram of the effect of water jet velocity on the average convective heat transfer coefficient;

[0039] Fig.13 Schematic diagram of CFRP material mesh division;

[0040] Fig.14 Schematic diagram of the phase change speed of CFRP (a) water jet + anaerobic environment (b) air environment;

[0041] Fig.15 Schematic diagram of the structure of CFRP phase change pressure (a) water jet + anaerobic environment (b) air environment Figure 1 ;

[0042] Fig.16 Schematic diagram of the structure of CFRP phase change pressure (a) water jet + anaerobic environment (b) air environment Figure 2 .

[0043] Among them, 1. platform frame; 2. protective liquid tank; 3. processing box; 301. main box body; 302. main box cover; 303. high-transmittance plane mirror; 4. air inlet; 5. air outlet; 6. processing platform; 7. return pipe; 8. water jet nozzle; 9. Y-axis electric slide rail; 901. track one; 902. stepper motor one; 903. rotating shaft; 10. X-axis electric slide rail; 1001. track two; 1002. stepper motor two; 1003. moving slider; 1004. installation shaft; 11. No. 1 servo; 12. No. 2 servo; 13. water pump; 14. infusion hose; 15. microporous filter plate. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1-10 As shown, the present invention provides a device for laser low-damage processing of carbon fiber composite materials, including a platform frame 1, a protective liquid tank 2 is provided below the platform frame 1, a processing box 3 is connected to the upper surface of the platform frame 1, the processing box 3 includes a main box body 301, a main box cover 302 and a high-transmittance plane mirror 303, the main box cover 302 is used in conjunction with the main box body 301, the high-transmittance plane mirror 303 is embedded through the center of the top of the main box cover 302, the high-transmittance plane mirror 303 is mainly used for the penetration of laser on the laser processor, an air inlet 4 and an air outlet 5 are provided through the processing box 3, two air outlets 5 are provided, the two air outlets 5 are staggered up and down, and control valves not shown in the figure are provided on the two air outlets 5 and the air inlet 4 for controlling the corresponding air outlets 5 and the opening and closing of the air inlet 4, wherein the air inlet 4 is used to be connected to the gas supply equipment equipped with protective gas, so as to introduce the protective gas into the processing box 3, wherein, if the density of the introduced protective gas or mixed protective gas is greater than the density of air, the protective gas sinks downward, and the air outlet 5 located at the top is opened to discharge the air in the processing box 3; if the density of the introduced protective gas or mixed protective gas is less than the density of air, the protective gas overflows, and the air outlet 5 located at the top is opened to discharge the air in the processing box 3, so that a dynamic approximately oxygen-free environment can be formed in the processing box 3. In addition, the air outlet 5 can be closed after the gas in the processing box 3 is discharged for a period of time, and at this time, a closed approximately oxygen-free processing space is formed in the processing box 3.

[0046] A processing platform 6 for placing the material to be processed is fixedly installed at the bottom of the processing box 3. The processing box 3 is connected to the protective liquid tank 2 through a reflux pipe 7. The reflux pipe 7 runs through the platform frame 1. The reflux pipe 7 can be used to make the protective liquid in the processing box 3 return to the protective liquid tank 2 in time, so as to achieve recycling and reduce the waste of the protective liquid. The inner wall of the processing box 3 is connected to a water jet nozzle 8 through an axial adjustment mechanism. The axial adjustment mechanism includes two Y-axis electric slide rails 9 fixedly connected to the inner wall of the processing box 3. The two Y-axis electric slide rails 9 are arranged horizontally at the same height. The two Y-axis electric slide rails 9 are respectively connected to the X-axis electric slide rails 10 through flange sliders. The X-axis electric slide rail 10 is connected to a movable bracket through a flange slider, wherein each flange slider is connected to a stepper motor at one end of the slide rail through a synchronous belt through a synchronous wheel, so that the stepper motor controls the movement of each slider, so that the X-axis electric slide rail 10, the movable bracket, etc. can be moved in a set manner. The movable bracket is fixedly mounted with a No. 1 servo 11 on the side wall, and the driving end of the No. 1 servo 11 is connected to the servo bracket with the No. 2 servo 12 by bolts through the rudder arm. The water jet nozzle 8 is connected to the driving end of the No. 2 servo 12 through the rudder arm, and the driving ends of the No. 1 servo 11 and the No. 2 servo 12 are arranged at 90° in the horizontal direction. The No. 1 servo 11 and the No. 2 servo 12 are used to control the spraying direction and angle of the water jet nozzle 8, so that the protective liquid can more accurately flush the workpiece being processed. In addition, the device is also provided with a PLC controller not shown in the figure, which is used to control the start and stop of the X-axis electric slide 10, the Y-axis electric slide 9, the No. 1 servo 11 and the No. 2 servo 12. At the same time, the PLC controller cooperates with the laser processor in the prior art, and can delay the laser processing tool path obtained by the built-in CPU calculation of the laser processor to obtain a liquid jet processing path, that is, the moving path of the water jet nozzle 8 in the device.

[0047] Specifically, the Y-axis electric slide rail 9 includes two tracks 901 and a stepper motor 902, the stepper motor 902 is fixedly connected to the outer wall of the processing box 3, the two tracks 901 are fixedly connected to the inner wall of the processing box 3, both ends of the two tracks 901 are rotatably installed with a rotating shaft 903 through a bearing seat, the output shaft of the stepper motor 902 is transmission-connected to the rotating shaft 903 through a synchronous belt 1, and the two rotating shafts 903 are transmission-connected through two synchronous belts 2. The X-axis electric slide rail 10 includes a track 1001 and a stepper motor 1002, two moving sliders 1003 are fixedly connected to the bottom of the track 1001, and the two moving sliders 1003 are respectively fixedly connected to the two synchronous belts 2, and the side wall of the track 1001 is rotatably installed with a mounting shaft 1004, the mounting shaft 1004 and the output shaft of the stepper motor 1002 are transmission-connected through a synchronous belt 3, and the movable bracket is fixedly installed on the synchronous belt 3. Its specific structure refers to Fig. 9As shown, after the stepper motor 1 902 is started, the synchronous belt 1 drives the rotating shaft 903 to rotate. At this time, the synchronous belts 2 at both ends of the rotating shaft 903 begin to move, thereby driving the moving slider 1003 to move. That is, at this time, the track 2 1001 as a whole begins to move along the track 1 901. Similarly, after the stepper motor 2 1002 is started, the synchronous belt 3 drives the moving bracket to start moving, so as to achieve the purpose of electrically adjusting the front, back, left and right positions of the moving bracket as a whole.

[0048] Among them, the protection liquid tank 2 is connected to a liquid guiding mechanism connected to the water jet nozzle 8, the liquid guiding mechanism includes a water pump 13 arranged in the protection liquid tank 2, the water outlet of the water pump 13 is connected to an infusion hose 14, the end of the infusion hose 14 away from the water pump 13 passes through the protection liquid tank 2 and the processing tank 3 and is connected to the water jet nozzle 8, the inner wall of the protection liquid tank 2 is fixedly connected to a microporous filter plate 15, the water pump 13 and the reflux pipe 7 are respectively located on both sides of the microporous filter plate 15, the liquid guiding mechanism pumps the protection liquid in the protection liquid tank 2 into the water jet nozzle 8, and the protection liquid sprayed out by the water jet nozzle 8 The protective liquid flushes the workpiece, flushes away the residue and part of the pyrolysis products generated by the laser processing of CFRP, reduces the thermal damage problems such as fiber pull-out, delamination, and fiber end expansion during laser processing, and also reduces air pollution. The present invention combines laser processing technology with water jet processing technology, and provides a dynamic air supply or directly closed processing space, which not only effectively solves the problems of thermal damage, combustion, oxidation of flammable materials, etc. In addition, the device can also be used for processing flammable and oxidizable materials, laser nitridation surface modification of metal materials, etc.

[0049] A method for laser low-damage processing of carbon fiber composite materials, comprising the following steps:

[0050] S1, install the device to one side of the laser processor, open the main box cover 302, place the material to be laser processed on the processing platform 6, and close the main box cover 302;

[0051] S2. Connect the air inlet 4 to the gas supply equipment filled with protective gas. After the gas supply equipment is turned on, the protective gas enters the processing box 3 through the air inlet 4. If the density of the filled protective gas is greater than that of the air, open the air outlet 5 located at the top, and the mixture of air and protective gas in the processing box 3 is continuously discharged outward through the air outlet 5 located at the top. If the density of the filled protective gas is less than that of the air, open the air outlet 5 located at the bottom, and the mixture of air and protective gas in the processing box 3 is continuously discharged outward through the air outlet 5 located at the bottom, and the oxygen content in the processing box 3 is continuously reduced to form a dynamic gas supply processing space; in S2, the protective gas is one or more of nitrogen, argon and helium. In addition, in addition to the above-mentioned dynamic gas flow state, a static gas atmosphere can also be used, that is, the upper and lower air outlets 5 are closed to form a closed processing space in the processing box 3.

[0052] S3, start the laser processor, the laser emitted by the laser processor passes through the high-transmittance plane mirror 303 and starts cutting the workpiece to be processed according to a predetermined route;

[0053] S4. While laser cutting is being performed, the laser processing tool path is calculated according to the built-in CPU of the laser processor, and a liquid jet processing path is obtained by delaying, that is, the moving path of the water jet nozzle 8 is obtained, and the water pump 13 is started. The water pump 13 draws the protective liquid in the protective liquid tank 2 into the infusion hose 14. The protective liquid in the infusion hose 14 is sprayed to the workpiece being processed through the water jet nozzle 8 to cool and flush the workpiece; the protective liquid in S4 is water or anhydrous ethanol solution; wherein, the water jet nozzle 8 is installed on the movable bracket, and the water jet nozzle 8 is driven to move by the movable bracket, that is, the purpose of controlling the movable bracket and the moving path of the water jet nozzle 8 can be achieved by controlling the stepper motor 1 901 and the stepper motor 2 1001.

[0054] S5, the protective liquid in the processing box 3 flows back to the protective liquid box 2 through the reflux pipe 7 to realize the circulation of the protective liquid. After the workpiece processing is completed, the water pump 13 and the laser processor are turned off, the main box cover 302 is opened, and the cooled workpiece is taken out.

[0055] The present invention adopts a method for low-damage laser processing of carbon fiber composite materials, and utilizes the strong cooling effect of water jets and the anaerobic environment for inhibiting oxidation combustion to control the thermal damage problem of laser processing. Fig.11 Schematic diagram of jet thin water layer assisted laser processing.

[0056] The average convective heat transfer coefficient along the jet is used to represent the average convective heat transfer capacity of the fluid in a specific area. Therefore, the average convective heat transfer coefficient in the wall jet area is:

[0057]

[0058] In the formula, k w is the thermal conductivity of water, Nu f is the Nusselt number in the wall jet region, L f is the characteristic length of the wall jet zone, and the offset distance of the water jet represents the characteristic length of the wall jet zone.

[0059] The water velocity in the jet-assisted flow is relatively high, so the turbulent boundary layer theory is used to integrate the local Nusselt number to obtain the average Nusselt number in the wall jet area:

[0060]

[0061] In the formula, Re f is the Reynolds number in the wall jet region, and Pr is the Prandtl number of water.

[0062] The average Reynolds number in the wall jet region can be expressed as:

[0063]

[0064] In the formula, ρ w is the density of water, v w is the water jet velocity, and μ is the dynamic viscosity of water.

[0065] The Prandtl number of water can be expressed as:

[0066]

[0067] In the formula, c w is the specific heat capacity of water.

[0068] Combining the above expressions, the average convective heat transfer coefficient of the wall jet area is obtained:

[0069]

[0070] According to the formula (Formula 5), ​​the average convective heat transfer coefficient of the wall jet area increases with the increase of the water jet velocity, so appropriately increasing the water jet velocity can reduce the thermal damage in laser processing. According to the formula (Formula 5), ​​the relationship between the water jet velocity and the average convective heat transfer coefficient of the wall jet area is plotted, as shown in Fig.12 As shown, it can be seen that the average convective heat transfer coefficient increases with the increase of water jet velocity.

[0071] In an air environment, carbon fiber and resin undergo oxidation reaction with oxygen under the condition of laser thermal action (Formula 6). The heat generated by oxidation promotes material removal, and the oxidation heat is determined by the mass concentration C of each component before and after oxidation. i and enthalpy ΔH i Calculate and obtain, as shown in formula (7),

[0072]

[0073] q oxi =C bef ΔH bef -C aft ΔH aft (Formula 7)

[0074] In addition, the laser heat source model is a typical Gaussian heat source Q laser , which can be expressed by formula 8,

[0075]

[0076] Where P max is the laser peak power; r is the effective radius of the laser heat source; r0 is the initial focusing radius of the laser; x is the coordinate value in the radial direction;

[0077] The effective heat source radius r of the laser focused on the workpiece surface can be expressed as:

[0078]

[0079] Where l is the laser wavelength; y is the depth coordinate value in the direction of the heat source.

[0080] Based on the above analysis of heat source and cooling model, a removal model of CFRP in oxygen-free environment water jet assisted laser processing is established. Fig.13 The schematic diagram of CFRP material mesh generation is shown in Figure 2. The removal process is calculated and the ablation results are shown in Figure 2. Fig.14 As shown, and compared with conventional ablation in air, Fig.14 and Fig.15 It can be seen that the method implemented by the device for low-damage laser processing of carbon fiber composite materials of the present invention can directly reduce the material phase change speed and pressure, and the degree of reduction is quantitatively and reliably verified through correlation analysis. Fig.16 This indicates that the present invention can reduce the temperature distribution range near the surface of the material and reduce the range of thermal damage.

[0081] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0082] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for laser low-damage processing of carbon fiber composite materials, characterized in that: The method for laser low-damage processing of carbon fiber composite materials is realized by a device for laser low-damage processing of carbon fiber composite materials; A device for laser low-damage processing of carbon fiber composite materials comprises a platform frame (1), characterized in that: a protective liquid tank (2) is provided below the platform frame (1), a processing box (3) is connected to the upper surface of the platform frame (1), an air inlet (4) and an air outlet (5) are provided through the processing box (3), a processing platform (6) for placing materials to be processed is fixedly installed at the bottom of the processing box (3), the processing box (3) is connected to the protective liquid tank (2) through a reflux pipe (7), the inner wall of the processing box (3) is connected to a water jet nozzle (8) through an axial adjustment mechanism, and the protective liquid tank (2) is connected to a liquid guide mechanism connected to the water jet nozzle (8); The processing box (3) comprises a main box body (301), a main box cover (302) and a high-transmittance plane mirror (303); the main box cover (302) is used in conjunction with the main box body (301); and the high-transmittance plane mirror (303) is embedded through the top center of the main box cover (302); The liquid guiding mechanism comprises a water pump (13) arranged in the protective liquid tank (2); the water outlet of the water pump (13) is connected to a liquid infusion hose (14); an end of the liquid infusion hose (14) away from the water pump (13) penetrates the protective liquid tank (2) and the processing tank (3) and is connected to the water jet nozzle (8); The method for laser low-damage processing of carbon fiber composite materials comprises the following steps: S1, installing the device on one side of the laser processing device, opening the main box cover (302), placing the material to be laser processed on the processing platform (6), and closing the main box cover (302); S2, connecting the air inlet (4) to an air supply device filled with protective gas. After the air supply device is turned on, the protective gas enters the processing box (3) through the air inlet (4). If the density of the protective gas filled is greater than that of air, the air outlet (5) located at the top is opened, and the mixture of air and protective gas in the processing box (3) is continuously discharged outward through the air outlet (5) located at the top. If the density of the protective gas filled is less than that of air, the air outlet (5) located at the bottom is opened, and the mixture of air and protective gas in the processing box (3) is continuously discharged outward through the air outlet (5) located at the bottom, and the oxygen content in the processing box (3) is continuously reduced to form a dynamic air supply processing space; S3, starting the laser processor, the laser emitted by the laser processor passes through the high-transmittance plane mirror (303) and starts cutting the workpiece to be processed according to a predetermined route; S4. While laser cutting is being performed, a liquid jet processing path is obtained by adding a certain delay according to the processing path of laser cutting, that is, a moving path of the water jet nozzle (8). If the laser processing path is a square frame, the liquid jet processing path is also a square frame, but the liquid jet processing will be delayed relative to the laser processing. The water pump (13) is started, and the water pump (13) draws the protective liquid in the protective liquid tank (2) into the infusion hose (14). The protective liquid in the infusion hose (14) is sprayed toward the workpiece being processed through the water jet nozzle (8), so as to cool and flush the workpiece; S5. The protective liquid in the processing box (3) flows back into the protective liquid box (2) through the reflux pipe (7) to realize the circulation of the protective liquid. After the workpiece processing is completed, the water pump (13) and the laser processor are turned off, the main box cover (302) is opened, and the cooled workpiece is taken out.

2. The method for low-damage laser processing of carbon fiber composite materials according to claim 1, characterized in that: The protective gas in S2 is one or more of nitrogen, argon and helium.

3. The method for low-damage laser processing of carbon fiber composite materials according to claim 1, characterized in that: The protective solution in S4 is water or anhydrous ethanol solution.

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