A composite laser 3D printing device

Abstract

This invention relates to the field of laser 3D printing technology and discloses a composite laser 3D printing device, comprising: a first laser source for generating a first wavelength laser; a second laser source for generating a second wavelength laser; a filter disposed on the output optical path of the first and second laser sources, wherein the first wavelength laser and the second wavelength laser form a coaxial composite optical path after passing through the optical path of the filter; and a galvanometer disposed on the composite optical path for controlling the movement of the first wavelength laser and the second wavelength laser on a working plane. This invention employs two lasers of different wavelengths coaxially for 3D printing, simultaneously satisfying the printing accuracy and quality of finely machined parts, as well as the printing efficiency of infilled parts; the two lasers use the same galvanometer, enabling high-precision splicing and fusion of parts requiring fine machining and parts requiring infilling, further improving the overall printing quality and efficiency of plastic materials.

Description

Technical Field

[0001] This invention relates to the field of laser 3D printing technology, and more specifically, to a composite laser 3D printing device. Background Technology

[0002] When processing plastic materials using laser 3D printing equipment, it is usually necessary to print layer by layer. The printing process is generally divided into two types of processing areas: the processing of fine parts and the processing of infill parts. The requirements for printing are also different for the two types of processing areas. The processing of fine parts requires the use of small laser spots to make the printing more accurate and ensure that the surface quality of the finished product is good. The processing of infill parts requires the use of large laser spots to improve printing efficiency and complete the printing as quickly as possible.

[0003] In existing technologies, printing equipment with variable spot size is typically used. By adjusting the diameter of the spot, a small spot is used for fine areas on the printing path, and a large spot is used for infill areas. Continuously variable spot size is used to adapt to the needs of fine and infill areas on the printing path, thereby improving printing quality. However, the above-mentioned printing equipment still has shortcomings. For example, the need to continuously adjust the spot size during printing undoubtedly increases printing time. Furthermore, when using the same laser beam for printing, the adjustment of laser power and beam quality is limited, making it impossible to meet the high printing efficiency requirements of the two processing areas.

[0004] Therefore, it is necessary to propose a composite laser 3D printing device to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a composite laser 3D printing device, comprising:

[0007] The first laser source is used to generate laser light of the first wavelength;

[0008] A second laser source is used to generate laser light of a second wavelength, wherein the second wavelength is different from the first wavelength;

[0009] A filter is disposed on the output optical path of the first laser source and the second laser source. The first wavelength laser and the second wavelength laser form a coaxial composite optical path after passing through the optical path of the filter.

[0010] A galvanometer, placed on the composite optical path, is used to control the movement of the first wavelength laser and the second wavelength laser on the working plane.

[0011] Preferably, the first wavelength is greater than the second wavelength, the output optical paths of the first laser source and the second laser source are both arranged at a 45-degree angle to the normal of the filter, the output optical paths of the first laser source and the second laser source are arranged perpendicularly, the laser of the first wavelength can pass through the filter, and the laser of the second wavelength is reflected at a 90-degree angle after encountering the filter.

[0012] Preferably, the first laser source is used to form a first light spot on the working plane, and the second laser source is used to form a second light spot on the working plane, wherein the size of the first light spot is larger than the size of the second light spot.

[0013] Preferably, the first wavelength is 405 nm and the second wavelength is 355 nm; or, the first wavelength is 10.6 μm and the second wavelength is 355 nm; or, the first wavelength is 2 μm and the second wavelength is 1 μm.

[0014] Preferably, it also includes: a printing path planning module, used to identify the geometric features of the 3D model to be printed, divide the 3D model into multiple printing slices, plan a first processing area and a first printing path for a first laser light source based on each printing slice, and plan a second processing area and a second printing path for a second laser light source;

[0015] The first processing area is the area on each printed slice that needs to be filled and processed, and the second processing area is the area on each printed slice that needs to be finely processed.

[0016] Preferably, it also includes:

[0017] The monitoring module is used to acquire real-time status data of the working plane during the printing process;

[0018] The control module is used to switch between the two laser printing modes, namely the separate printing mode and the collaborative printing mode, in real time based on the status data of the working plane.

[0019] Preferably, the state data of the working plane includes temperature field data and topography of the working plane; the monitoring module includes:

[0020] The temperature monitoring unit is used to acquire temperature field data of the working plane in real time;

[0021] The topography monitoring unit is used to monitor the topography data of the working plane in real time from the laser scanning perspective.

[0022] Preferably, the control module includes:

[0023] The first identification control unit is used to identify abnormal temperature areas based on the temperature field data of the working plane, and switch to collaborative printing mode to control the first laser light source and the second laser light source to perform annealing treatment on the abnormal temperature areas.

[0024] The second identification control unit is used to identify abnormal shape areas based on the shape data of the working plane and switch to collaborative printing mode to control the first laser light source and the second laser light source to perform surface treatment on the abnormal shape areas.

[0025] Preferably, the printing path planning module pre-embeds process instruction points in the first printing path and the second printing path. The process instruction points are used to receive instructions from the control module to trigger the collaborative printing mode.

[0026] Preferably, it further includes a modulation device disposed in the composite optical path after the filter, used to adjust the spot parameters of the first and second light spots; the modulation device includes:

[0027] A beam expander is used to adjust the diameter of the first and second light spots.

[0028] The focusing component, working in conjunction with the galvanometer, is used to maintain the focus of the first and second light spots on the working plane during printing.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The composite laser 3D printing equipment described in this invention uses two lasers with different power and beam quality, and employs two different wavelengths of lasers coaxially for 3D printing. This can simultaneously meet the printing accuracy and quality of finely processed parts, as well as the printing efficiency of infill processing parts. In addition, the two lasers use the same galvanometer, which can achieve high-precision splicing and fusion of parts that require fine processing and parts that require infill processing, further improving the overall printing quality and efficiency.

[0031] Other advantages, objectives and features of the composite laser 3D printing equipment described in this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the composite laser 3D printing equipment described in this invention;

[0034] Figure 2 This is a block diagram of the modules in the composite laser 3D printing equipment described in this invention;

[0035] Figure 3 This is a block diagram of the monitoring module in the composite laser 3D printing equipment of the present invention;

[0036] Figure 4 This is a block diagram of the control module in the composite laser 3D printing equipment described in this invention.

[0037] In the attached diagram, 1 is the first laser source, 2 is the second laser source, 3 is the filter, 4 is the galvanometer, and 5 is the working plane. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0039] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0040] like Figure 1 As shown, the present invention provides a composite laser 3D printing device, comprising:

[0041] A first laser source 1 is used to generate laser light of a first wavelength;

[0042] The second laser source 2 is used to generate laser light of a second wavelength, wherein the second wavelength is different from the first wavelength;

[0043] The filter 3 is disposed on the output optical path of the first laser source 1 and the second laser source 2. The first wavelength laser and the second wavelength laser form a coaxial composite optical path after passing through the filter 3.

[0044] The galvanometer 4 is placed on the composite optical path and is used to control the movement of the first wavelength laser and the second wavelength laser on the working plane 5.

[0045] The first laser source 1 and the second laser source 2 are different lasers, and the power of the lasers and the quality of the laser beam formed can be selected according to specific needs;

[0046] The filter 3 uses a dichroic mirror, which is set according to the first wavelength of the laser and the second wavelength of the laser. It is used to selectively reflect and transmit laser beams to separate lasers of different wavelengths, so that when the two lasers are incident on the filter 3 in different directions, they can form a coaxial composite optical path.

[0047] The galvanometer 4 includes an X-axis galvanometer unit and a Y-axis galvanometer unit. Each galvanometer unit is controlled by a drive motor, enabling the laser beam to move along the X and Y axes and reach any point on the working plane 5. It also includes a field lens unit for focusing correction, ensuring that the laser beam can maintain a focused state and a constant printing and scanning speed across the entire working plane, thereby achieving better printing results. After passing through the filter 3, both lasers can reach the working plane through the same galvanometer 4, and the position of the laser is controlled by the same galvanometer 4.

[0048] Furthermore, the first laser source 1 is used to form a first light spot on the working plane 5, and the second laser source 2 is used to form a second light spot on the working plane 5, wherein the size of the first light spot is larger than the size of the second light spot.

[0049] A first wavelength laser can form a first spot on the working plane 5, and a second wavelength laser can form a second spot on the working plane 5. The first spot is used for filling processing, and the second spot is used for fine processing. The parts that need fine processing are mainly the contours, and the parts that need filling processing are mainly all large areas within the contours that do not require high precision. For the first laser source 1 used for filling processing, a higher power laser can be selected, while for the second laser source 2 used for fine processing, a laser with high laser beam quality can be selected.

[0050] In the above design, two lasers with different power and beam quality were selected, and two different wavelengths of lasers were used coaxially for 3D printing. This can simultaneously meet the printing accuracy and quality of finely processed parts, as well as the printing efficiency of infill processing parts. In addition, the two lasers use the same galvanometer 4, which can accurately splice and fuse the parts that need fine processing and the parts that need infill processing, further improving the overall printing quality and efficiency.

[0051] like Figure 1 As shown, in one embodiment, the first wavelength is greater than the second wavelength, the light output paths of the first laser source 1 and the second laser source 2 are both arranged at a 45-degree angle to the normal of the filter 3, the light output paths of the first laser source 1 and the second laser source 2 are arranged perpendicularly, the laser of the first wavelength can pass through the filter 3, and the laser of the second wavelength is reflected at a 90-degree angle after encountering the filter 3.

[0052] like Figure 1As shown, the first wavelength laser generated by the first laser source 1 is incident on the filter 3 from above and downwards, and then passes through the filter 3 without changing direction. The second wavelength laser generated by the second laser source 2 is incident on the filter 3 from right to left, and then, under the reflection of the filter 3, is coaxially incident on the galvanometer 4 with the first wavelength laser. Through the above design, the first wavelength laser can be transmitted and the second wavelength laser can be reflected, ensuring that the optical paths of the two lasers are coaxial after passing through the filter 3, so that both are incident on the same galvanometer 4.

[0053] In one embodiment, the first wavelength is 405 nm and the second wavelength is 355 nm; or, the first wavelength is 10.6 μm and the second wavelength is 355 nm; or, the first wavelength is 2 μm and the second wavelength is 1 μm.

[0054] Depending on the printing material used, composite laser 3D printing equipment can select different laser combinations;

[0055] If the printing material is photosensitive resin, the first laser source 1 generates a laser with a wavelength of 405nm, and the second laser source 2 generates a laser with a wavelength of 355nm, which is applied to products that are rapidly prototyping by photopolymerization.

[0056] If the printing material is a resin-based composite material or ceramic, the first laser source 1 generates a laser with a wavelength of 10.6μm, and the second laser source 2 generates a laser with a wavelength of 355nm, which is applied to embedded circuits or multifunctional component products.

[0057] If the printing material is a crack-prone special alloy or glass, the first laser source 1 generates a laser with a wavelength of 2μm, and the second laser source 2 generates a laser with a wavelength of 1μm, which can be applied to medical products or special glass products.

[0058] like Figure 2 As shown, in one embodiment, it further includes: a printing path planning module, used to identify the geometric features of the three-dimensional model to be printed, divide the three-dimensional model into multiple printing slices, plan a first processing area and a first printing path for the first laser light source 1 based on each printing slice, and plan a second processing area and a second printing path for the second laser light source 2.

[0059] The first processing area is the area on each printed slice that needs to be filled and processed, and the second processing area is the area on each printed slice that needs to be finely processed.

[0060] The first processing area includes the main filling area and the support structure filling area on each printed slice; the main filling area includes all large areas inside the contour that do not require high precision; the support structure filling area includes support structures that do not require high surface quality, since most support structures only need to ensure support and do not require high surface quality.

[0061] The second processing area includes the contour area and feature area on each printed slice; the contour area includes the inner and outer contour boundaries, which are usually offset outward by 1-2 spot diameters to ensure accuracy; the feature area includes tiny holes, fine textures, support interfaces for overhanging structures, thin walls less than 2mm, etc.; it may also include a remelting area, which includes the overlapping area between the first and second printing paths, used to ensure the quality of the joint.

[0062] In addition, the first and second printing paths are planned with the goal of minimizing the overall printing time to ensure printing efficiency.

[0063] like Figure 2 As shown, in one embodiment, it further includes:

[0064] The monitoring module is used to acquire the status data of the working plane 5 in real time during the printing process;

[0065] The control module is used to switch between the two laser-based separate printing modes and collaborative printing modes in real time based on the status data of the working plane 5.

[0066] The division of labor printing mode involves using the first laser light source 1 to print according to the first processing area and the first printing path, and using the second laser light source 2 to print according to the second processing area and the second printing path; the collaborative printing mode involves using the first laser light source 1 and the second laser light source 2 to process the abnormal area when the status data of the working plane 5 is abnormal.

[0067] During the printing of each layer based on each printing slice, the monitoring module acquires the status data of the working plane 5 in real time. The working plane 5 is the current printing layer. Since the temperature distribution of the working plane 5 and the surface condition after printing may be abnormal during printing, timely processing is required to ensure printing quality. Therefore, the current working plane 5 can be monitored during printing or after the current layer is printed. When an abnormality occurs, the control module switches from the division printing mode to the collaborative printing mode. The collaborative printing mode of the two lasers is used to process the abnormal area in time to ensure the quality of the working plane 5.

[0068] like Figure 3As shown, in one embodiment, the state data of the working plane 5 includes the temperature field data and the topography of the working plane 5; the monitoring module includes:

[0069] The temperature monitoring unit is used to acquire the temperature field data of the working plane 5 in real time;

[0070] The topography monitoring unit is used to monitor the topography data of the working plane 5 in real time from the laser scanning perspective.

[0071] The temperature monitoring unit can use equipment such as an infrared thermal imager to monitor the temperature field of the current printing area in real time. When it detects that the temperature of the area being filled is too high (which is prone to stress) or that the temperature of the overhanging structure and thin wall is abnormal, it can automatically trigger the laser formed by the second laser source 2 to process the area.

[0072] The morphology monitoring unit can employ a high-definition camera for calibration, monitoring, and identification of potential defects.

[0073] The temperature field data of working plane 5 can reflect whether the printed structure has internal stress due to uneven temperature distribution, specifically in the abnormal high temperature area and the low temperature gradient area.

[0074] Among them, the abnormally high temperature zone usually occurs in the area of ​​large-area filling processing of continuous laser scanning printing. The heat accumulation will cause the local temperature to be much higher than the glass transition temperature of the material. Especially in the cooling stage, the cooling and shrinkage rate of the abnormally high temperature zone is much greater than that of the surrounding area. Such uneven shrinkage will generate huge tensile stress, which will lead to warping or cracks. Therefore, it is necessary to treat the abnormally high temperature zone by using low-energy laser to maintain the temperature of this area and make it cool slowly and evenly.

[0075] Low-temperature gradient zones typically appear at the edges of overhanging structures or thin-walled structures. These zones dissipate heat quickly and have low temperatures, while adjacent newly printed areas (i.e., hot zones) are still shrinking. The cold zone is pulled by the large shrinkage force of the hot zone, forming a point of tensile stress concentration. At this time, it is necessary to supplement the heating of the cold zone to raise its temperature above the glass transition temperature of the material, thereby increasing the mobility of its molecular chains to resist or release the tensile stress formed by the pulling, and at the same time, reduce the temperature gradient with the hot zone.

[0076] The topography data of the working plane 5 can reflect the surface roughness of the printed area. For example, if the printed area needs a smoother and finer surface quality, the topography data can reflect whether the current printed surface quality meets the requirements.

[0077] like Figure 4 As shown, in one embodiment, the control module includes:

[0078] The first identification control unit is used to identify abnormal temperature areas based on the temperature field data of the working plane 5, and switch to collaborative printing mode to control the first laser light source 1 and the second laser light source 2 to perform annealing treatment on the abnormal temperature areas.

[0079] The second identification control unit is used to identify abnormal morphology areas based on the morphology data of the working plane 5, and switch to collaborative printing mode to control the first laser light source 1 and the second laser light source 2 to perform surface treatment on the abnormal morphology areas.

[0080] Among them, the abnormal temperature region includes the abnormal high temperature region and the low temperature gradient region; the abnormal morphology region is the region where the surface roughness does not meet the requirements.

[0081] The first identification control unit identifies abnormal temperature areas by comparing the temperature field data of the working plane 5 with the preset temperature process parameters of the printed slice corresponding to the working plane 5. Based on the comparison result, it dynamically decides whether to trigger a switch from the division of labor printing mode to the collaborative printing mode, so as to control the first laser source 1 and / or the second laser source 2 to perform annealing treatment on the abnormal temperature areas. The specific annealing treatment method is the same as the specific treatment method for the abnormal high temperature area and low temperature gradient area in the aforementioned embodiment. The principle is to use the first laser source 1 and / or the second laser source 2 to perform annealing treatment on the abnormal temperature areas with an energy density lower than the curing threshold. Annealing scanning, the curing threshold refers to a critical value of laser energy density. Above the critical value, the photosensitive resin will undergo a cross-linking reaction, changing from a liquid state to a solid state, i.e., curing. Below the critical value, the laser energy is insufficient to trigger a new curing reaction, but it is sufficient to produce a physical effect, i.e., heating. Therefore, when using a low-energy-density laser to scan the abnormal temperature region (the already cured region), it is equivalent to precisely heating it locally. The heating process allows the polymer molecular chains to move, relax, and rearrange, changing from a high-energy stress state to a more stable low-energy state. This process can release internal stress without changing the existing geometry of the part.

[0082] The second identification control unit identifies abnormal morphology areas by comparing the morphology data of the working plane 5 with the preset morphology image or preset morphology parameters of the printed slice corresponding to the working plane 5 (both based on roughness comparison). Based on the comparison result, it dynamically decides whether to trigger a switch from the division of labor printing mode to the collaborative printing mode, so as to control the first laser source 1 and / or the second laser source 2 to perform surface processing on the abnormal morphology areas. The specific surface processing method is to control the first laser source 1 and / or the second laser source 2 to process the working plane 5 in a defocus mode. The defocus mode is to make the focus of the laser deviate from the surface of the working plane 5, so that the laser beam projected onto the working plane 5 is defocused. As the spot size of the working plane 5 increases, the energy density per unit area (i.e., the ratio of power to area) decreases. For example, for stereolithography and other resins, low-energy-density lasers micro-heat the surface of the cured resin, causing a very thin layer on its surface to reach a state of micro-melting or softening. Surface tension causes the molten material to automatically level out, thereby filling the microscopic uneven areas. Then, it is immediately re-cured, resulting in a smoother surface with lower surface roughness. For some resins, low-energy-density scanning may trigger further cross-linking reactions of the surface resin, causing it to shrink more fully and the structure to become more compact, which is beneficial for improving surface gloss and mechanical properties.

[0083] The control module can process the working plane 5 in a timely manner. During processing, the lasers generated by the first laser source 1 and the second laser source 2 are coaxially projected onto the working plane 5, which facilitates the timely switching of the working states of the two lasers in the collaborative working mode without the need for repositioning, thereby further improving printing efficiency and printing quality.

[0084] In one embodiment, the print path planning module pre-embeds process instruction points in the first print path and the second print path. The process instruction points are used to receive instructions from the control module to trigger a collaborative printing mode.

[0085] The process instruction point is used to receive control instructions from the first identification control unit and the second identification control unit, thereby triggering a collaborative printing mode to execute instructions for annealing and surface treatment in the first printing path and the second printing path.

[0086] In one embodiment, a modulation device is further included, disposed in the composite optical path after the filter 3, for adjusting the spot parameters of the first and second light spots; the modulation device includes:

[0087] A beam expander is used to adjust the diameter of the first and second light spots.

[0088] The focusing component, working in conjunction with the galvanometer 4, is used to maintain the focus of the first and second light spots on the working plane 5 during the printing process.

[0089] Based on the aforementioned embodiments, a modulation device can be added. The beam expander uses a motor drive to change the spacing of the internal lens group, thereby adjusting the size of the spot that is finally focused on the working plane 5. For example, the 405nm laser can switch between 100μm (filling processing) and 50μm (fine processing) to adjust the first spot, while the 355nm laser can be fixed at a small spot of 20μm (for fine processing) to adjust the second spot. The focusing component works in conjunction with the galvanometer 4. The galvanometer 4 is used for laser scanning and printing on the XY plane, while the focusing component is used to adjust the Z-axis focal position in real time through a movable lens to ensure that the spot size and energy density remain consistent across the entire large-area working plane 5, without defocusing.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A composite laser 3D printing device, characterized in that, include: A first laser source (1) is used to generate laser light of a first wavelength; A second laser source (2) is used to generate a laser of a second wavelength, wherein the second wavelength is different from the first wavelength; The filter (3) is placed on the light output path of the first laser source (1) and the second laser source (2). The first wavelength laser and the second wavelength laser form a coaxial composite optical path after passing through the filter (3). A galvanometer (4) is placed on the composite optical path to control the movement of the first wavelength laser and the second wavelength laser on the working plane (5); It also includes: a printing path planning module, which is used to identify the geometric features of the three-dimensional model to be printed, divide the three-dimensional model into multiple printing slices, plan a first processing area and a first printing path for the first laser light source (1) based on each printing slice, and plan a second processing area and a second printing path for the second laser light source (2); The first processing area is the area on each printed slice that needs to be filled and processed, and the second processing area is the area on each printed slice that needs to be finely processed. The first and second printing paths are planned with the goal of minimizing the overall printing time. Also includes: The monitoring module is used to acquire the status data of the working plane (5) in real time during the printing process; The control module is used to switch between the two laser division printing modes and collaborative printing modes in real time based on the status data of the working plane (5); Among them, the division of labor printing mode is to use the first laser light source (1) to print according to the first processing area and the first printing path, and use the second laser light source (2) to print according to the second processing area and the second printing path; the collaborative printing mode is to use the first laser light source (1) and the second laser light source (2) to process the abnormal area when the status data of the working plane (5) is abnormal. The state data of the working plane (5) includes the temperature field data and the morphology of the working plane (5); The control module includes: The first identification control unit is used to identify abnormal temperature areas based on the temperature field data of the working plane (5) and switch to collaborative printing mode to control the first laser light source (1) and the second laser light source (2) to perform annealing treatment on the abnormal temperature areas. The second identification control unit is used to identify abnormal morphological areas based on the morphological data of the working plane (5) and switch to the collaborative printing mode to control the first laser light source (1) and the second laser light source (2) to perform surface treatment on the abnormal morphological areas.

2. The composite laser 3D printing equipment according to claim 1, characterized in that, The first wavelength is greater than the second wavelength. The light output paths of the first laser source (1) and the second laser source (2) are arranged at a 45-degree angle to the normal of the filter (3). The light output paths of the first laser source (1) and the second laser source (2) are arranged perpendicularly. The laser of the first wavelength can pass through the filter (3). The laser of the second wavelength is reflected at a 90-degree angle after encountering the filter (3).

3. The composite laser 3D printing equipment according to claim 2, characterized in that, The first laser source (1) is used to form a first light spot on the working plane (5), and the second laser source (2) is used to form a second light spot on the working plane (5). The size of the first light spot is larger than the size of the second light spot.

4. The composite laser 3D printing equipment according to claim 2, characterized in that, The first wavelength is 405 nm and the second wavelength is 355 nm; or, the first wavelength is 10.6 μm and the second wavelength is 355 nm; or, the first wavelength is 2 μm and the second wavelength is 1 μm.

5. The composite laser 3D printing equipment according to claim 1, characterized in that, The monitoring module includes: Temperature monitoring unit, used to acquire temperature field data of working plane (5) in real time; The morphology monitoring unit is used to monitor the morphology data of the working plane (5) in real time from the laser scanning perspective.

6. The composite laser 3D printing equipment according to claim 1, characterized in that, The printing path planning module pre-embeds process instruction points in the first and second printing paths. These process instruction points are used to receive instructions from the control module to trigger the collaborative printing mode.

7. The composite laser 3D printing equipment according to claim 3, characterized in that, It also includes a modulation device, disposed in the composite optical path after the filter (3), for adjusting the spot parameters of the first and second light spots; the modulation device includes: A beam expander is used to adjust the diameter of the first and second light spots. The focusing component, working in conjunction with the galvanometer (4), is used to maintain the first and second light spots in focus on the working plane (5) during the printing process.

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