A Sweeping Method and System for Microwave Curing of CFRP Workpieces

Abstract

The present invention discloses a sweeping method and system for microwave curing of CFRP workpieces, which relates to the technical field of forming and manufacturing of carbon fiber reinforced resin matrix composites. The method includes: calculating the sweeping power and sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; for any surface of the carbon fiber reinforced resin matrix composite workpiece, using a microwave loading source to perform microwave irradiation sweeping on the surface in a first sweeping manner based on a first time period and the sweeping power; using the microwave loading source to perform microwave irradiation sweeping on the surface in a second sweeping manner based on a second time period and the sweeping power; the second sweeping manner is: repeatedly performing multiple sweeps using a third sweeping grid, and after each sweep, updating the third sweeping grid to a third sweeping network reduced by a preset multiple, and then performing the next sweep. The present invention makes the microwave irradiation more uniform and improves the curing and forming efficiency and energy utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of forming and manufacturing of carbon fiber reinforced resin matrix composites, and particularly to a sweeping method and system for microwave curing of CFRP workpieces. Background Art

[0002] Carbon fiber reinforced resin matrix composites (CFRP, Carbon Fiber Reinforced Polymer) have been widely used in various fields due to their many excellent comprehensive mechanical properties. At present, for the curing and forming of carbon fiber reinforced resin matrix composites, traditional heat conduction curing technology is mainly used, with low manufacturing efficiency and difficult to further improve the forming quality. The emergence of microwave curing technology provides a certain opportunity for the high-quality and high-efficiency curing and forming of resin matrix composites. Microwave radiation has strong penetration, and internal polar material molecules can instantaneously absorb microwaves, thus shortening the heating time. However, its research and process are not yet mature, which hinders its popularization and application.

[0003] The existing main problems of microwave curing technology can be divided into two parts. One part is caused by its own characteristics. The microwave radiation with a constant frequency is limited by its own characteristics, and there will be peak difference zeros and maximum values in the change and transmission of the oscillation wave, that is, it will cause cold and hot spots in the CFRP workpiece, resulting in a differential temperature distribution. The other part is caused by external processes. At present, the application of microwave curing-related processes cannot effectively solve the problem of uneven microwave irradiation. The distance between each local position of the workpiece and the microwave emission cavity determines the intensity of the microwave irradiation received, and uneven irradiation will still lead to a differential temperature distribution. For the above reasons, the uniform irradiation of microwave curing technology during the microwave loading period has become a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a sweeping method and system for microwave curing of CFRP workpieces, which use microwaves to sweep the workpieces, making the microwave irradiation more uniform and improving the curing and forming efficiency and energy utilization rate.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A sweeping method for microwave curing of CFRP workpieces, comprising:

[0007] Calculating a sweeping power and a sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period;

[0008] For any surface of the carbon fiber reinforced resin matrix composite workpiece, based on the first time period and the scanning power, a microwave loading source is used to perform microwave irradiation scanning on the surface in a first scanning mode; the first scanning mode is: the first scanning grid and the second scanning grid are scanned alternately; both the first scanning grid and the second scanning grid include scanning lines in a single direction, and the scanning lines in the first scanning grid are orthogonal to the scanning lines in the second scanning grid;

[0009] Based on the second time period and the scanning power, a microwave loading source is used to perform microwave irradiation scanning on the surface in a second scanning mode; the second scanning mode is: the third scanning grid is used to repeat scanning multiple times, and after each scanning, the third scanning grid is updated to a third scanning network reduced by a preset multiple, and then the next scanning is performed; the third scanning grid includes scanning lines in two directions, and the scanning lines in the two directions are orthogonal.

[0010] Optionally, the determination process of the microwave loading source specifically includes:

[0011] Determine the irradiation surface of the microwave emitter on the carbon fiber reinforced resin matrix composite workpiece;

[0012] Select the irradiation surface area with the irradiation intensity within the first preset intensity range as the irradiation loading source.

[0013] Optionally, the first preset intensity range is 80%-100% of the maximum irradiation intensity.

[0014] Optionally, the material data of the carbon fiber reinforced resin matrix composite workpiece includes the workpiece size and the curing temperature process curve corresponding to the workpiece;

[0015] The calculation of the scanning power and the scanning time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece specifically includes:

[0016] Establish a three-dimensional Cartesian coordinate system of the carbon fiber reinforced resin matrix composite workpiece;

[0017] Based on the three-dimensional Cartesian coordinate system, determine the projection surface of the carbon fiber reinforced resin matrix composite workpiece in each coordinate axis direction;

[0018] Based on the projection surface in each coordinate axis direction and the workpiece size, determine the maximum depth thickness value corresponding to each projection surface;

[0019] According to the maximum depth thickness value corresponding to each projection surface and the curing temperature process curve corresponding to the workpiece, determine the scanning power and the scanning time period.

[0020] Optionally, any surface of the carbon fiber reinforced resin matrix composite workpiece is the workpiece surface corresponding to the projection plane in any coordinate axis direction;

[0021] The sweeping lines in the first sweeping grid and the sweeping lines in the second sweeping grid are both parallel to the projection plane in the coordinate axis direction.

[0022] Optionally, establishing a three-dimensional Cartesian coordinate system for the carbon fiber reinforced resin matrix composite workpiece specifically includes:

[0023] If the carbon fiber reinforced resin matrix composite workpiece is a workpiece with regular morphology and orthogonal plane features, a three-dimensional Cartesian coordinate system is established based on the feature plane being orthogonal or parallel to the projection plane;

[0024] If the carbon fiber reinforced resin matrix composite workpiece is a workpiece with irregular morphology, a three-dimensional Cartesian coordinate system is established with the centroid of the carbon fiber reinforced resin matrix composite workpiece as the origin.

[0025] Optionally, the sweeping method further includes:

[0026] After sweeping any surface of the carbon fiber reinforced resin matrix composite workpiece, the microwave emitter is rotated by a set angle, and then another surface of the carbon fiber reinforced resin matrix composite workpiece is swept.

[0027] To achieve the above object, the present invention also provides the following technical solutions:

[0028] A sweeping system for microwave curing of a CFRP workpiece, including:

[0029] A preset time calculation module for calculating the sweeping power and the sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period;

[0030] A first sweeping module for irradiating and sweeping any surface of the carbon fiber reinforced resin matrix composite workpiece with a microwave loading source based on the first time period and the sweeping power in a first sweeping manner; the first sweeping manner is: alternating sweeping of a first sweeping grid and a second sweeping grid; both the first sweeping grid and the second sweeping grid include sweeping lines in a single direction, and the sweeping lines in the first sweeping grid are orthogonal to the sweeping lines in the second sweeping grid;

[0031] A second sweeping module, configured to perform microwave irradiation sweeping on the surface based on the second time period and the sweeping power, using a microwave loading source, in accordance with a second sweeping manner; the second sweeping manner is: repeatedly performing sweeping multiple times using a third sweeping grid, and after each sweeping, updating the third sweeping grid to a third sweeping network reduced by a preset multiple, and then performing the next sweeping; the third sweeping grid includes sweeping lines in two directions, and the sweeping lines in the two directions are orthogonal.

[0032] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0033] The present invention discloses a sweeping method and system for microwave curing of CFRP workpieces. First, according to the material data of the carbon fiber reinforced resin matrix composite workpiece, the sweeping power, the first time period, and the second time period are calculated. Then, using a microwave loading source, based on the sweeping power and the first time period, the surface of the workpiece is swept in an alternating sweeping manner according to the first sweeping grid and the second sweeping grid. Since both the first sweeping grid and the second sweeping grid include sweeping lines in a single direction, it can first complete a rough single-pass sweeping of the workpiece surface. After that, based on the sweeping power and the second time period, the surface of the workpiece is repeatedly swept multiple times using the third sweeping grid, and after each sweeping, the third sweeping grid is updated to a third sweeping network reduced by a preset multiple, and then the next sweeping is performed, so that deep sweeping can be achieved for the parts with a large thickness and depth of the workpiece. For the entire workpiece, irradiating and heating the workpiece using the first sweeping manner and the second sweeping manner can make the temperature of each part of the workpiece evenly heated, effectively solving the problem that it is difficult to balance the curing stress of large-thickness workpieces, non-standard shaped workpieces, etc. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic flowchart of the sweeping method for microwave curing of CFRP workpieces of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the microwave loading source of the present invention;

[0037] Figure 3 It is a sweeping schematic diagram of Specific Example 1 of the present invention;

[0038] Figure 4 It is a sweeping schematic diagram of Specific Example 2 of the present invention;

[0039] Figure 5 This is a schematic structural diagram of the sweeping system for microwave curing of CFRP workpieces in the present invention.

[0040] Symbol description:

[0041] 1 - Microwave transmitter, 2 - Microwave irradiation ray, 3 - Cross-section of the projection plane of the microwave transmitter on the workpiece surface, 31 - Point source, 32 - Iso-intensity line with an irradiation intensity of 50%, 33 - Edge line with an irradiation intensity of approximately 0%, 4 - Line source, 5 - CFRP gas cylinder structural member, 51 - First sweeping grid corresponding to the CFRP gas cylinder structural member, 52 - Second sweeping grid corresponding to the CFRP gas cylinder structural member, 53 - Third sweeping grid corresponding to the CFRP gas cylinder structural member, 54 - Reduced third sweeping grid corresponding to the CFRP gas cylinder structural member, 6 - "T"-shaped CFRP workpiece, 61 - First sweeping grid corresponding to the "T"-shaped CFRP workpiece, 62 - Second sweeping grid corresponding to the "T"-shaped CFRP workpiece, 63 - Third sweeping grid corresponding to the "T"-shaped CFRP workpiece, 64 - Reduced third sweeping grid corresponding to the "T"-shaped CFRP workpiece. Specific implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] In order to solve the problems of uneven temperature and curing degree existing in the existing microwave curing and forming process of CFRP, as well as the resulting local stress concentration and serious warping deformation, the present invention provides a sweeping method and system for microwave curing of CFRP workpieces, which can perform balanced sweeping irradiation on multiple projection planes, and can be generally applied to the actual microwave curing and forming process to improve the uniformity of temperature distribution and reduce prominent problems such as stress and strain caused by excessive temperature difference.

[0044] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0045] Embodiment 1

[0046] As Figure 1 shown, this embodiment provides a sweeping method for microwave curing of CFRP workpieces, including:

[0047] Step 100: Calculate the sweeping power and the sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period. The material data of the carbon fiber reinforced resin matrix composite workpiece includes the workpiece size and the curing temperature process curve corresponding to the workpiece.

[0048] Step 100 specifically includes:

[0049] 1) Establish a three-dimensional Cartesian coordinate system for the carbon fiber reinforced resin matrix composite workpiece; specifically, if the carbon fiber reinforced resin matrix composite workpiece is a workpiece with regular morphology and orthogonal plane features, then based on the feature plane being orthogonal or parallel to the projection plane, establish a three-dimensional Cartesian coordinate system; if the carbon fiber reinforced resin matrix composite workpiece is a workpiece with irregular morphology, then use the centroid of the carbon fiber reinforced resin matrix composite workpiece as the origin to establish a three-dimensional Cartesian coordinate system, such that any one of the six-axis direction projections can achieve the maximum projected area.

[0050] By establishing a three-dimensional Cartesian coordinate system for workpieces with different morphologies above, the adaptive adjustment of the geometric morphology, thickness and other features of different CFRP workpieces is realized, which further facilitates the subsequent steps.

[0051] 2) Based on the three-dimensional Cartesian coordinate system, determine the projection planes of the carbon fiber reinforced resin matrix composite workpiece in each coordinate axis direction.

[0052] 3) Based on the projection planes in each coordinate axis direction and the workpiece size, determine the maximum depth thickness values corresponding to each projection plane.

[0053] 4) Determine the sweeping power and the sweeping time period according to the maximum depth thickness value corresponding to each projection plane and the curing temperature process curve corresponding to the workpiece. Specifically, calculate the average depth thickness value according to the maximum depth thickness value corresponding to each projection plane, and then use the corresponding selected power and pass through the corresponding time according to the requirements of the curing temperature process curve, so that the temperature at the average value of the maximum depth thickness size just meets the requirements.

[0054] Among them, the sweeping power can be expressed by the microwave absorption energy formula as follows:

[0055] P = 2πfε0ε″E 2

[0056] f is the microwave frequency of the sweep, ε0 is the relative permittivity of the CFRP workpiece, ε″ is the dielectric loss factor of the CFRP workpiece, and E is the electric field strength in the radiation region.

[0057] The sweeping time can be expressed as follows:

[0058]

[0059] Among them, T a is the curing target temperature preset by the curing temperature process curve, T0 is the initial temperature of the CFRP workpiece, and β is the heating rate of the CFRP workpiece.

[0060] Step 200, for any surface of the carbon fiber reinforced resin matrix composite workpiece, based on the first time period and the scanning power, use a microwave loading source to perform microwave irradiation scanning on the surface according to the first scanning method; the first scanning method is: the first scanning grid and the second scanning grid are alternately scanned; both the first scanning grid and the second scanning grid include scanning lines in a single direction, and the scanning lines in the first scanning grid are orthogonal to the scanning lines in the second scanning grid.

[0061] Among them, as shown in Figure 2, the projection mode of the microwave irradiation in the microwave emitter 1 is convergent wave scattering, generally in a conical scattering, that is, the microwave irradiation ray 2 is conical; the cross-section 3 of the projection surface of the microwave emitter on the workpiece surface is circular, and its radiation intensity is the largest at the center. Take the point with the maximum radiation intensity value as the center, and take 80% of the distance from the center to the maximum radiation intensity value as the radius of the envelope circle. The envelope circle is formed by the isoline at 80% of the maximum radiation intensity. The radiation intensity within the envelope circle is 80%-100% of the maximum radiation intensity, and this irradiation area is regarded as a point source, that is, the area with 100% - 80% of the maximum irradiation intensity forms the point source 31. The movement of the point source constitutes a line source 4, that is, the microwave irradiation adopts a linear scanning method. Within the cross-section 3 of the projection surface of the microwave emitter on the workpiece surface, there is also an isoline 32 with an irradiation intensity of 50% and an edge line with an irradiation intensity of approximately 0%.

[0062] Furthermore, the point source moves on the upper, lower, left, right, front, and back projection surfaces of the workpiece through mechanical movements such as displacement and deflection of the fixed arm to form a line source, that is, to form the corresponding scanning path.

[0063] As can be seen from the above, the determination process of the microwave loading source specifically includes:

[0064] 1) Determine the irradiation surface of the microwave emitter on the carbon fiber reinforced resin matrix composite workpiece. The applied frequency of the microwave emitter is 2.45 GHz.

[0065] 2) Select the irradiation surface area with the irradiation intensity within the first preset intensity range as the irradiation loading source. The first preset intensity range is 80%-100% of the maximum irradiation intensity.

[0066] Based on the above microwave loading source, it is possible to emphasize the practical effectiveness of the point source area with a relatively high radiation intensity, relatively consider the influence brought by the weak radiation area, and set a reasonable scanning spacing, that is, the distance from the center to the 50% irradiation intensity is used as the spacing.

[0067] In addition, any surface of the carbon fiber reinforced resin matrix composite workpiece is the workpiece surface corresponding to the projection plane in any coordinate axis direction; the sweeping lines in the first sweeping grid and the sweeping lines in the second sweeping grid are both parallel to the projection plane in the coordinate axis direction.

[0068] Further, the first time period includes a first time, a second time, and a third time. During the first time, sweeping is performed using the first sweeping grid to achieve sweeping in any axial direction; during the second time, sweeping is performed using the second sweeping grid to achieve sweeping in the orthogonal axial direction, and after the end of the second time, the temperature of the carbon fiber reinforced resin matrix composite workpiece reaches the first preset temperature range. Generally speaking, it is difficult to reach an exact temperature value, so a certain temperature range is set. If the workpiece temperature is within the temperature range, it means it meets the standard. For example, if the required temperature of a certain workpiece is 75 °C, then the temperature range can be set to 70 °C - 80 °C, which can be set by relevant staff according to actual needs.

[0069] During the third time, alternate sweeping using the first sweeping grid and the second sweeping grid is performed, so that the dimensions of the carbon fiber reinforced resin matrix composite workpiece are maintained within the first preset temperature range, that is, the first heat preservation stage is reached.

[0070] Step 300, based on the second time period and the sweeping power, use a microwave loading source to perform microwave irradiation sweeping on the surface according to a second sweeping method; the second sweeping method is: repeatedly perform sweeping using a third sweeping grid, and after each sweeping, update the third sweeping grid to a third sweeping network reduced by a preset multiple, and then perform the next sweeping; the third sweeping grid includes sweeping lines in two directions, and the sweeping lines in the two directions are orthogonal.

[0071] The second time period includes a fourth time, a fifth time, and a sixth time. During the fourth time, sweeping is performed using the third sweeping grid. The third sweeping grid includes sweeping lines in two orthogonal directions, and the sweeping lines in the two orthogonal directions are respectively parallel to the two axis directions of the three-dimensional Cartesian coordinate system. In addition, the grid formed by the sweeping lines in the two orthogonal directions is a square, and the side length of the square is the radius distance from the central position with 100% of the maximum projection radiation intensity value to the position with 50% of the maximum radiation intensity value.

[0072] In a specific embodiment, before performing sweeping using the third sweeping grid, the microwave loading source can also be moved a preset distance so that the sweeping path of the third sweeping grid is the interval midline of the sweeping path in step 200.

[0073] After completing the sweep at the fourth time, reduce the third swept grid by a preset multiple. Specifically, reduce both the size and density of the third swept grid so that when sweeping again, within the fifth time, it is possible to achieve a sweep of the grid lines in the parts with a relatively large depth and thickness on the projection plane of the workpiece. Here, the preset multiple is set by relevant staff according to actual needs. According to the set preset multiple, the microwave loading source can be correspondingly reduced by a corresponding distance along the axis direction of the sweep.

[0074] Within the sixth time, repeat the sweeping action within the fifth time, so that the dimensions of the carbon fiber reinforced resin matrix composite workpiece are maintained within the second preset temperature range, that is, the second heat preservation stage is reached.

[0075] In addition, since the power is determined, the feed rate of the microwave sweep can be adaptively adjusted according to the different depths and thicknesses of the workpiece on the microwave sweep projection plane, so that sufficient time is spent on the surface with the corresponding depth and thickness to reach the temperature required by the curing temperature process curve.

[0076] In a specific practical application, the sweeping method further includes: after sweeping any surface of the carbon fiber reinforced resin matrix composite workpiece, rotate the microwave emitter by a set angle, and then sweep another surface of the carbon fiber reinforced resin matrix composite workpiece. The set angle is 0 - 180°.

[0077] For a carbon fiber reinforced resin matrix composite workpiece with multiple projection planes, the sweeping order for the surfaces corresponding to the multiple projection planes is: sweep the two opposite surfaces in sequence, and then sweep any adjacent surface.

[0078] Specific Example 1

[0079] As Figure 3 shown, specifically applied to the CFRP gas cylinder structural member 5, the heating method required by the curing temperature process curve is explained in combination with the view projection of the CFRP gas cylinder structural member 5 and its loading and sweeping path. Among them, 51 is the sweeping line in any axial direction on the projection plane of the CFRP gas cylinder structural member 5, that is, the corresponding first swept grid, used in the early stage of the first heating stage; 52 is the sweeping line orthogonal to the direction of 51 on the projection plane of the CFRP gas cylinder structural member 5, that is, the corresponding second swept grid, used in the later stage of the first heating stage; 53 is the orthogonal sweeping line matching any axial direction on the projection of the CFRP gas cylinder structural member 5, that is, the corresponding third swept grid, used in the early stage of the second heating stage; 54 is the refined orthogonal sweeping line matching any axial direction on the projection plane of the CFRP gas cylinder structural member 5, especially for local areas with a large depth of thickness, that is, the reduced third swept grid, used in the later stage of the second heating stage.

[0080] Specific Example 2

[0081] As Figure 4 shown, specifically applied to the "T"-shaped CFRP workpiece 6, the heating method required by the curing temperature process curve is explained in combination with the three-view projection of the "T"-shaped CFRP workpiece 6 and its loading and sweeping path. Among them, 61 is a sweeping line in any axial direction on the projection plane of the "T"-shaped CFRP workpiece 6, that is, the corresponding first sweeping grid, which is used in the early stage of the first heating stage; 62 is a sweeping line orthogonal to the direction of 61 on the projection plane of the "T"-shaped CFRP workpiece 6, that is, the corresponding second sweeping grid, which is used in the later stage of the first heating stage; 63 is an orthogonal sweeping line matching any axial direction on the projection of the "T"-shaped CFRP workpiece 6, that is, the corresponding third sweeping grid, which is used in the early stage of the second heating stage; 64 is a refined orthogonal sweeping line matching any axial direction on the projection plane of the "T"-shaped CFRP workpiece 6, especially for local areas with a large thickness depth, that is, the reduced third sweeping grid, which is used in the later stage of the second heating stage.

[0082] In Figure 4 .e, t1 to t4 are the time nodes of each stage; a is the early stage of the first heating stage; b is the later stage of the first heating stage; then it reaches the first heat preservation stage. At this time, a and b are alternated to make the "T"-shaped CFRP workpiece 6 stable at the first heat preservation temperature; c is the early stage of the second heating stage; d is the later stage of the second heating; then it reaches the second heat preservation stage. Here, c and d are still alternated to make the "T"-shaped CFRP workpiece 6 stable at the second heat preservation temperature. The three projection planes corresponding to the three-view projection of the workpiece are the same as this situation and will not be elaborated.

[0083] In summary, based on the existing deficiencies of the CFRP microwave curing technology, aiming at the problems of excessive temperature gradient and curing degree in large-thickness parts, easy stress concentration, and serious warping deformation, the present invention proposes a method for microwave balanced sweeping of CFRP components to prevent local temperature overshoot and improve the microwave curing efficiency. According to the morphological characteristics of the CFRP component and the local different thicknesses, sweeping paths with different densities are used on the projection plane; first, the microwave is used to roughly sweep each side of the component in a single pass, and the sweeping action is completed by the coordinated mechanical movements such as deflection and translation of the fixed arm of the microwave emission cavity; on the projection plane with a large thickness depth, a refined multi-pass orthogonal sweep is carried out; the microwave sweep makes the local temperatures of the workpiece more balanced and can be carried out according to the corresponding curing process temperature curve, which can effectively solve the problem of difficult balance of curing stress in large-thickness parts and non-standard morphology parts cured by microwave.

[0084] The technical principle and operation of the present invention are simple and easy to implement, improve the energy utilization rate, greatly reduce the uneven curing phenomenon of CFRP, and can be widely applied to the CFRP curing and forming process.

[0085] Example 2

[0086] As Figure 5 shown, in order to implement the solution described in Example 1, this embodiment provides a sweeping system for microwave curing of CFRP workpieces, including:

[0087] A preset time calculation module 101, configured to calculate a sweeping power and a sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period.

[0088] A first sweeping module 201, configured to perform microwave irradiation sweeping on any surface of the carbon fiber reinforced resin matrix composite workpiece based on the first time period and the sweeping power by using a microwave loading source according to a first sweeping method; the first sweeping method is: alternating sweeping between a first sweeping grid and a second sweeping grid; both the first sweeping grid and the second sweeping grid include sweeping lines in a single direction, and the sweeping lines in the first sweeping grid are orthogonal to the sweeping lines in the second sweeping grid.

[0089] A second sweeping module 301, configured to perform microwave irradiation sweeping on the surface according to a second sweeping method based on the second time period and the sweeping power by using a microwave loading source; the second sweeping method is: repeatedly performing sweeping using a third sweeping grid, and after each sweeping, updating the third sweeping grid to a third sweeping network reduced by a preset multiple, and then performing the next sweeping; the third sweeping grid includes sweeping lines in two directions, and the sweeping lines in the two directions are orthogonal.

[0090] Compared with the prior art, the present invention also has the following advantages:

[0091] The present invention can meet the requirements of single microwave irradiation curing of CFRP workpieces, can achieve adaptive irradiation adjustment of six projection planes, and the radiation sweeping path is more balanced, so that the curing temperature distribution is more uniform, greatly improving the curing forming efficiency and energy utilization rate, and can meet different uniformity requirements.

[0092] In this specification, each embodiment is described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0093] In this article, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A sweeping method for microwave curing of CFRP workpieces, characterized in that, The sweeping method includes: Calculating a sweeping power and a sweeping time period according to the material data of a carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period; the material data of the carbon fiber reinforced resin matrix composite workpiece includes workpiece dimensions and a curing temperature process curve corresponding to the workpiece; Calculating a sweeping power and a sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece, specifically including: Establishing a three-dimensional Cartesian coordinate system of the carbon fiber reinforced resin matrix composite workpiece; based on the three-dimensional Cartesian coordinate system, determining a projection plane of the carbon fiber reinforced resin matrix composite workpiece in each axis direction; based on the projection plane in each axis direction and the workpiece dimensions, determining a maximum depth thickness value corresponding to each projection plane; determining the sweeping power and the sweeping time period according to the maximum depth thickness value corresponding to each projection plane and the curing temperature process curve corresponding to the workpiece; For any surface of the carbon fiber reinforced resin matrix composite workpiece, based on the first time period and the sweeping power, using a microwave loading source, performing microwave irradiation sweeping on the surface according to a first sweeping method; the first sweeping method is: alternately sweeping with a first sweeping grid and a second sweeping grid; both the first sweeping grid and the second sweeping grid include sweeping lines in a single direction, and the sweeping lines in the first sweeping grid are orthogonal to the sweeping lines in the second sweeping grid; Based on the second time period and the sweeping power, using a microwave loading source, performing microwave irradiation sweeping on the surface according to a second sweeping method; the second sweeping method is: repeatedly sweeping with a third sweeping grid for multiple times, and after each sweeping, updating the third sweeping grid to a third sweeping network reduced by a preset multiple, and then performing the next sweeping; the third sweeping grid includes sweeping lines in two directions, and the sweeping lines in the two directions are orthogonal.

2. The sweeping method for microwave curing of CFRP workpieces according to claim 1, characterized in that The determination process of the microwave loading source specifically includes: Determining an irradiation surface of a microwave emitter on the carbon fiber reinforced resin matrix composite workpiece; Selecting an irradiation surface area with an irradiation intensity within a first preset intensity range as the irradiation loading source.

3. The sweeping method for microwave curing of CFRP workpieces according to claim 2, characterized in that, The first preset intensity range is 80%-100% of the maximum irradiation intensity.

4. The sweeping method for microwave curing of CFRP workpieces according to claim 1, characterized in that, Any surface of the carbon fiber reinforced resin matrix composite workpiece is a workpiece surface corresponding to a projection plane in any axis direction; The sweeping lines in the first sweeping grid and the sweeping lines in the second sweeping grid are both parallel to the projection plane in the axis direction.

5. The sweeping method for microwave curing of CFRP workpieces according to claim 1, characterized in that, Establishing the three-dimensional Cartesian coordinate system of the carbon fiber reinforced resin matrix composite workpiece specifically includes: If the carbon fiber reinforced resin matrix composite workpiece is a workpiece with regular morphology and orthogonal plane features, then establishing a three-dimensional Cartesian coordinate system based on the feature plane being orthogonal or parallel to the projection plane; If the carbon fiber reinforced resin matrix composite workpiece is a workpiece with irregular morphology, then establishing a three-dimensional Cartesian coordinate system with the centroid of the carbon fiber reinforced resin matrix composite workpiece as the origin.

6. The sweeping method for microwave curing of CFRP workpieces according to claim 2, characterized in that, The sweeping method further includes: After sweeping any surface of the carbon fiber reinforced resin matrix composite workpiece, rotate the microwave emitter by a set angle, and then sweep another surface of the carbon fiber reinforced resin matrix composite workpiece.

7. A sweeping system for the sweeping method of microwave curing of CFRP workpieces according to claim 1, characterized in that, The sweeping system includes: A preset time calculation module for calculating the sweeping power and the sweeping time period according to the material data of the carbon fiber reinforced resin matrix composite workpiece; the sweeping time period includes a first time period and a second time period; A first sweeping module for irradiating and sweeping any surface of the carbon fiber reinforced resin matrix composite workpiece with microwaves based on the first time period and the sweeping power by using a microwave loading source in a first sweeping manner; the first sweeping manner is: alternating sweeping between a first sweeping grid and a second sweeping grid; both the first sweeping grid and the second sweeping grid include sweeping lines in a single direction, and the sweeping lines in the first sweeping grid are orthogonal to the sweeping lines in the second sweeping grid; A second sweeping module for irradiating and sweeping the surface with microwaves based on the second time period and the sweeping power by using a microwave loading source in a second sweeping manner; the second sweeping manner is: repeating sweeping multiple times with a third sweeping grid, and after each sweeping, updating the third sweeping grid to a third sweeping network reduced by a preset multiple, and then performing the next sweeping; the third sweeping grid includes sweeping lines in two directions, and the sweeping lines in the two directions are orthogonal.

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