Additive manufacturing equipment and light path system thereof

Abstract

The utility model discloses additive manufacturing equipment and a light path system thereof, the light path system of the additive manufacturing equipment comprises a laser and a galvanometer system, the laser is a continuous laser, the wavelength of the laser is 2 microns, and the clear aperture of a lens of the galvanometer system is 25 mm or less; the coating film reflectivity of an X lens and a Y lens of the galvanometer system is 85% or above; the scanning speed of the galvanometer system ranges from 2 rad / s to 35 rad / s, and the jumping and scanning delay ranges from 0 us to 1500 us. According to the additive manufacturing equipment and the light path system thereof, the laser device is a continuous laser device, the wavelength of the laser device is 2 microns, and the clear aperture of the lens of the galvanometer system matched with the laser device is only 25 mm or below 25 mm, so that the motor drives the lens to respond quickly, and scanning of a three-dimensional printing single layer can be completed quickly and efficiently; and the laser target surface can obtain focusing light spots of 50-1000 microns, so that the formation of small details can be completed, namely, the workpiece printing is more refined.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to an additive manufacturing device and a light path system thereof. BACKGROUND

[0002] Additive manufacturing technology is a kind of rapid manufacturing technology which forms a three-dimensional object by controlling a laser to scan layer by layer. The process flow is as follows: firstly, the three-dimensional model of the workpiece is sliced to obtain the cross-section information of each layer of the workpiece; the powdered material is uniformly spread on the surface of the work platform, and the laser selectively melts the powder according to the system instruction; after one cross-section is completed, a new layer of material is spread, and selective scanning is continued according to the cross-section information corresponding to the three-dimensional object; the next cross-section is spread and scanned according to the above method, and finally a three-dimensional object is obtained.

[0003] At present, the three-dimensional printing of high polymer composite powder material generally uses CO2 laser with wavelength of 10 μm band or CO laser with wavelength of 5 μm band. The cost of the above laser is high, especially the CO laser. Because the water absorption rate of infrared light with wavelength of 5.5 μm is high, the cost of water-free treatment of the light path is high when the CO laser is used, and once water molecules enter the light path, the stability of the laser power will be greatly affected.

[0004] Due to the wavelength, the minimum focusing spot of the three-dimensional printing using the above wavelength of CO2 laser is generally about 400 μm, and the minimum focusing spot of the three-dimensional printing using the CO laser is generally about 200 μm, which limits the prospect of fine parts of three-dimensional printing.

[0005] Due to the wavelength, in order to obtain the smallest focusing spot, the XY lens of the galvanometer system used with the CO2 laser is generally 30 mm lens. The galvanometer motor driving lens is difficult to respond quickly, so the scanning efficiency of the CO2 laser is not high.

[0006] Moreover, the output stability of the above CO2 or CO laser is generally 5% positive and negative, which is not enough for materials with high requirements for laser output stability; the response time of the CO2 or CO laser when it is turned on and off is generally 60-120 us, which will cause the end point of the scanning line to exist dragging or overburning caused by the failure to turn off the laser in time when the mirror speed is fast, which affects the quality of the parts; the cross section of the light output of the CO2 or CO laser exists random form, even appears secondary light spot, and even the beam cross section is different under different power, thereby limiting the application of high-precision three-dimensional printing; the electro-optical conversion efficiency of the CO2 or CO laser is relatively low, generally about 10%-25%, which increases the use cost of the customer.

[0007] The above CO2 or CO laser adopts a pulse signal to turn on and off the laser, and adjusts the laser power size through pulse width modulation or pulse number modulation, thus the molten pool is actually composed of a plurality of laser pulse points and is discontinuous, and the molten pool stability is poor, and thus a high-quality sintering effect cannot be obtained.

[0008] In addition, many polymer composite powder materials have high transmittance at a wavelength of about 1 μm, which is not conducive to the three-dimensional printing of the polymer composite powder material, because the 1 μm laser can pass through the material instead of being absorbed; and an additive needs to be added to the polymer to increase the absorbance at the 1 μm wavelength, but this makes the manufacturing process more complex. On the other hand, many polymer composite powder materials have strong absorbance near a wavelength of about 10 μm, which can cause effective surface heating, but is not the local heating required for precise machining, and cannot form a fine three-dimensional printing. Practical new content

[0009] In order to solve the above problems existing in the prior art, the utility model provides a kind of additive manufacturing equipment and its optical path system, the optical path system of this additive manufacturing equipment is used for the printing forming of polymer composite powder material, scanning speed is faster, target surface focusing spot is smaller, molten pool is more stable, and workpiece printing is more fine.

[0010] In order to achieve the above purpose, the utility model provides a kind of additive manufacturing equipment's optical path system, including laser and galvanometer system, the laser is continuous laser, and wavelength is 2 μm, the light aperture of the mirror of the galvanometer system is 25mm and below;The coating reflectivity of the X mirror and Y mirror of the galvanometer system is all above 85%;And the scanning speed of the galvanometer system is 2rad / s-35rad / s.

[0011] As a further preferred scheme of the utility model, the optical path system further includes collimating mirror, dynamic diverging mirror and focusing mirror, the laser includes optical fiber head, so that the laser emitted by the laser is shot into collimating mirror from optical fiber head, the laser becomes parallel light after collimating mirror, and the laser is shot to dynamic diverging mirror, and under the action of dynamic diverging mirror, it is shot to focusing mirror in the form of divergence, then it is shot to galvanometer system in the form of convergence, and then under the action of galvanometer system, the working area is selectively scanned.

[0012] As a further preferred scheme of the utility model, the optical path system further includes collimating mirror and field lens, the laser includes optical fiber head, so that the laser emitted by the laser is shot into collimating mirror from optical fiber head, the laser becomes parallel light after collimating mirror, and then is incident to galvanometer system and field lens in sequence, and then under the action of galvanometer system and field lens, the working area is selectively scanned.

[0013] As a further preferred scheme of the utility model, the coating reflectivity of the X mirror and the Y mirror of the galvanometer system is above 99.5%.

[0014] As a further preferred scheme of the utility model, the clear aperture of the mirror of the galvanometer system is 14mm or below.

[0015] As a further preferred scheme of the utility model, the laser is a fiber laser, a solid laser or a semiconductor laser.

[0016] As a further preferred scheme of the utility model, the laser is a thulium-doped fiber laser.

[0017] As a further preferred scheme of the utility model, the galvanometer system is a two-dimensional galvanometer or a three-dimensional galvanometer.

[0018] The utility model also provides a kind of additive manufacturing equipment, it includes the optical path system described in any one of the above, and the optical path system is used to carry out selective scanning to the macromolecular composite powder material of working area.

[0019] As a further preferred scheme of the utility model, the additive manufacturing equipment further includes computer and control card, the computer obtains all slice data after the three-dimensional model of the printed piece to be printed is sliced layer by layer, and transmits slice data to control card, and the control card controls the movement of galvanometer system by outputting digital signal, to make the laser emitted by laser to deflect under the movement of galvanometer system, to carry out selective scanning to the macromolecular composite powder material of working area.

[0020] The additive manufacturing equipment and the optical path system thereof of the utility model have the following beneficial effects by adopting the above technical scheme:

[0021] 1. The laser of the utility model is continuous laser, and the wavelength is 2 μm, and the clear aperture of the mirror of the galvanometer system matched with it is only 25mm or below, so that the response of motor-driven mirror is very fast, and three-dimensional printing single layer scanning can be completed at high speed and high efficiency;And laser target surface can obtain 50 μm-1000 μm focusing spot, so that small details can be formed, i.e. workpiece printing is more refined;

[0022] 2. The laser of the utility model with wavelength 2 μm, not only power output stability is good, and fluctuation range is within the setting power positive and negative 1%, so that scanning molten pool is stable, and electro-optical conversion efficiency is as high as 40%;And the laser of this wavelength, since optical path does not need special treatment, such as no hydration treatment, so the production cost is lower;

[0023] 3. The utility model discloses a laser is continuous laser, make it can adopt modulated signal to switch laser, adopt analog quantity to continuous regulation laser power, like this can obtain stable molten pool to improve the printing quality.

[0024] 4. The utility model discloses the laser and galvanometer system with specific parameters above are adopted, make it when scanning to high molecular composite powder material, because the functional group carbonyl of high molecular powder material, imino to above wavelength there is certain absorption peak, above chemical bond absorbs laser energy and heats up and melts powder material, therefore can cooperate galvanometer system and print layer by layer, finally form three -dimensional workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is structural schematic diagram of example one that the utility model provides additive manufacturing equipment;

[0026] Figure 2 It is structural schematic diagram of example two that the utility model provides additive manufacturing equipment;

[0027] Figure 3 It is molten pool uniformity of using CO2 or CO laser;

[0028] Figure 4 It is molten pool energy distribution graph of using CO2 or CO laser in skywriting mode;

[0029] Figure 5 It is molten pool uniformity of using fiber laser of the utility model.

[0030] Mark in drawing:

[0031] 1, computer, 2, control card, 3, laser, 4, optical fiber head, 5, collimating mirror, 6, dynamic diverging mirror, 7, focusing mirror, 8, galvanometer system, 9, laser, 10, work area, 11, powder return cylinder piston, 12, work cylinder piston, 13, powder feeding cylinder piston, 14, working cavity, 15, high molecular powder material, 16, roller, 17, field lens. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantage of the application more clear and obvious, the application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described here are only used to explain the application, and are not used to limit the application.

[0033] In order to achieve the above object, the utility model provides a kind of light path system of additive manufacturing equipment, including laser 3 and galvanometer system 8, the laser 3 is continuous laser 3, and wavelength is 2 μm, the light aperture of the lens of the galvanometer system 8 is 25mm and below;The coating reflectivity of X lens and Y lens of the galvanometer system 8 is all above 85%;And the scanning speed of the galvanometer system 8 is 2rad / s-35rad / s.In specific implementation, the jump and scanning delay of galvanometer system 8 is 0us-1500us.

[0034] The cost of the 2 μm wavelength laser 3 under the same power is much lower than that of CO2 or CO laser, compared with the wavelength (for example, 10.6 μm) of CO2 laser, single-mode M2=1, BPP=λ / Π=3.38mm*mrad, while the 2 μm wavelength laser 3 of the utility model, single-mode M2=1, BPP=λ / Π=0.637mm*mrad, assuming that the beam divergence angles of the above two kinds of light are consistent, it can be deduced from BPP=Wxθ that the focusing spot diameter obtained by using the 2 μm wavelength laser 3 of the utility model is about 1 / 5 of that of CO2 laser, and similarly, it is about 1 / 3 of that of CO laser, which means that the utility model can print finer workpieces and features, that is, fine printing can be realized.

[0035] In 3D printing, CO2 laser generally uses XY lens with a light aperture of 30mm for scanning, and the response time and scanning speed of the galvanometer are difficult to improve. The wavelength of the laser 3 of the present application is relatively short, about 1 / 5 of the wavelength of CO2 laser, so XY lens with a light aperture of 25mm or less can be used for scanning. The response time of XY lens with a light aperture of 25mm is only 1 / 2 of that of 30mm XY lens, so the scanning speed can be improved, that is, the scanning efficiency is improved.

[0036] The present application uses continuous laser, so that it can use modulation signal to switch laser 9, and use analog quantity to continuously adjust the power of laser 9. Compared with CO2 or CO laser, the power of laser 9 is adjusted by pulse width modulation or pulse number modulation, and the molten pool is composed of pulse points. The molten pool is unstable (see Figure 3 ), the light path system of the present application can obtain stable molten pool, thereby improving the printing quality.

[0037] As an embodiment of the present application, the optical path system also includes a collimating mirror 5, a dynamic diverging mirror 6 and a focusing mirror 7, so that the laser 9 emitted by the laser 3 is emitted from the optical fiber head 4 of the laser 3 into the collimating mirror 5. After the laser 9 is converted into parallel light by the collimating mirror 5, the laser 9 is emitted toward the dynamic diverging mirror 6, and under the action of the dynamic diverging mirror 6, it is emitted toward the focusing mirror 7 in a divergent form, and then emitted toward the galvanometer system 8 in a converging form, and then the working area 10 is selectively scanned under the action of the galvanometer system 8.

[0038] As another embodiment of the present application, the optical path system also includes a collimator 5 and a field lens 17, so that the laser light 9 emitted by the laser 3 is incident on the collimator 5 from the optical fiber head 4 of the laser 3, and after the laser light 9 is converted into parallel light by the collimator 5, it is incident on the galvanometer system 8 and the field lens 17 in turn, and then the working area 10 is selectively scanned under the action of the galvanometer system 8 and the field lens 17.

[0039] Preferably, in order to further improve the printing quality, the coating reflectivity of the X lens and the Y lens of the galvanometer system 8 is above 99.5%; and the transmittance of other optical lenses, such as the diverging mirror, the focusing mirror 7, the field lens 17, and the plane mirror is also above 99.5%.

[0040] In order to further improve the 3D printing speed, the clear aperture of the lens of the galvanometer system 8 is 14 mm or less.

[0041] Specifically, the laser 3 is a fiber laser, a solid laser, or a semiconductor laser, and of course it can be other types of lasers, which are not listed here one by one. The galvanometer system 8 is a two-dimensional galvanometer or a three-dimensional galvanometer.

[0042] like Figure 3 As shown, CO2 or CO lasers use pulse width adjustment to adjust the energy of laser 9. Because the pulse has a period and pulse width, it is discontinuous in timing. Finally, the molten pool formed by laser 9 shooting at the powder surface is also discontinuous and uneven. If the period and pulse width are not properly controlled, the light emitted by the pulse cannot continuously overlap in the molten pool, and the molten pool will be periodically disconnected, which has a significant impact on the printing quality of 3D printing. Figure 4 As shown in the figure, in the skywriting mode, the galvanometer is scanning at a uniform speed at the light-emitting position. When the speed is fast, when the CO2 or CO laser switches the laser 9 through the pulse width modulation signal, there is a certain delay in the actual response of the laser 9 energy, causing the laser 9 energy to rise ramp-up during the delay time. However, at this time, the scanning speed is high and uniform. At the head of the molten pool formed in this section of the scanning path, the molten pool energy will gradually increase. Figure 4The black is the required energy density, the gray is the substandard energy density, and the substandard energy density will affect the printing quality. Similarly, when the laser is turned off, the substandard energy density will also be formed at the tail of the molten pool, which will also affect the printing quality.

[0043] Further preferably, the laser 3 is a thulium-doped fiber laser with a wavelength of 1.95-2.1 microns. The laser 3 has good power output stability, with a fluctuation range of within plus or minus 1% of the set power, so that the scanning molten pool is stable. The laser 3 has a good spot shape, and the target surface focusing spot ellipticity can reach more than 98%, ensuring the size stability. The laser 9 is switched by a modulation signal, and the power of the laser 9 is adjusted by an analog signal. Because the analog quantity is continuous, the laser 9 signal emitted by the analog quantity is continuous, and the powder surface molten pool is also continuous, so the quality of the three-dimensional printed workpiece is well controlled, as shown in FIG. 5. Figure 5

[0044] The utility model also provides a kind of additive manufacturing equipment, it includes the optical path system described in any of the above embodiments, and the optical path system is used to carry out selective scanning to the macromolecular composite powder material of working area 10. The above-mentioned macromolecular composite powder material at least includes the macromolecular powder material 15 containing carbonyl and imino functional group, so that the carbonyl, amino and carbon-hydrogen bond in the macromolecular composite powder material have certain absorption peaks to the above-mentioned wavelength, the macromolecular powder material is fused after the above-mentioned chemical bond absorbs laser 9 energy and is heated, and through cooperation galvanometer system 8, layer-by-layer printing is realized, and finally three-dimensional workpiece is formed. It can be understood that it can be a kind of macromolecular powder material 15, can also be composed of several macromolecular powder materials 15, of course, can also be composed of macromolecular powder material 15 and other non-macromolecular powder materials (for example, ceramic material), and here it is not enumerated one by one.

[0045] As a further preferred scheme of the utility model, the additive manufacturing equipment further includes computer 1 and control card 2, the computer 1 obtains all slice data after carrying out layer-by-layer slicing to the three-dimensional model of the workpiece to be printed, and transmits the slice data to control card 2, the control card 2 controls the movement of galvanometer system 8 by outputting digital signal, so that the laser 9 emitted by laser 3 deflects under the movement of galvanometer system 8, to carry out selective scanning to the macromolecular composite powder material of working area 10.

[0046] It can be understood that, in specific implementation, the above-mentioned additive manufacturing equipment further includes working cavity 14 and powder spreader and the like, since the core of the present application is to print macromolecular composite powder material by using the above-mentioned laser 3 and galvanometer system 8 with specific structure and parameters, so the other existing components included in the additive manufacturing equipment are not introduced in detail.

[0047] ​In order to enable those skilled in the art to better understand and implement the technical solutions of the present invention, they are described in detail below in the form of embodiments and drawings.

[0048] Example 1

[0049] like Figure 1 As shown, the additive manufacturing equipment of this embodiment includes a computer 1, a control card 2, an optical fiber head 4, a collimating lens 5, a dynamic diverging lens 6, a focusing lens 7, a laser 3, a galvanometer system 8, a powder return cylinder, a powder return cylinder piston 11, a working cylinder, a working cylinder piston 12, a powder delivery cylinder, a powder delivery cylinder piston 13, a working chamber 14, and a roller 16. The laser 3 is a continuous laser with a wavelength of 2μm. The aperture of the lenses of the galvanometer system 8 is 14mm or less, and the coating reflectivity of its X and Y lenses is both above 99.5%. The scanning speed of the galvanometer system 8 is 2rad / s-35rad / s. The jump and scanning delay is 0us-1500us.

[0050] The specific printing process of the additive manufacturing device in this embodiment is as follows:

[0051] The inert gas is filled into the working cavity 14, the powder feeding cylinder piston 13 is raised to a certain height, the working cylinder piston 12 is lowered by one layer thickness, the roller 16 moves from left to right to uniformly spread the polymer powder material 15 to the working area 10 of the working cylinder, the computer 1 obtains all layer slice data by slicing the three-dimensional model of the to-be-printed part layer by layer, and transmits the current layer data to the control card 2, the control card 2 outputs a digital signal to control the movement of the galvanometer system 8, the wavelength of the laser 3 used in the embodiment is 2 μm, compared with the wavelength of the CO2 laser, if the wavelength is 10.6 μm, the single-mode M2 is 1, and the BPP is λ / Π = 3.38 mm*mrad, the wavelength used in the embodiment is about 2 μm, the single-mode M2 is 1, and the BPP is λ / Π = 0.637 mm*mrad, if the beam divergence angles of the above two kinds of light beams are consistent, it can be deduced from BPP = W*θ that the focusing spot diameter that can be obtained by the laser 3 with a wavelength of about 2 μm in the embodiment is about 1 / 5 of that of the CO2 laser, and similarly, it is about 1 / 3 of that of the CO2 laser, which means that more detailed workpieces and features can be printed. Moreover, because the wavelength is 1 / 5 of that of the CO2 laser, in the 3D printing process, the CO2 laser generally uses an XY lens with an aperture of 30 mm for scanning, and the response time and scanning speed of the galvanometer are difficult to improve. Because the wavelength of the laser 3 used in the embodiment is relatively short, an XY lens with an aperture of less than 14 mm can be used for scanning, the response time of the XY lens with an aperture of 14 mm is only 1 / 3 of that of the XY lens with an aperture of 30 mm, and the scanning speed can also be faster, so the scanning of a single layer can be completed efficiently. A modulated signal and an analog signal are output to control the switching and power size of the laser 3, the laser 9 is emitted from the fiber head 4 to the collimating mirror 5, the laser 9 becomes parallel light after passing through the collimating mirror 5, the laser 9 is emitted to the dynamic divergence mirror 6, the laser 9 is emitted to the focusing mirror 7 in a divergent form, then is emitted to the galvanometer system 8 in a convergent form, and then is emitted to the required scanning area according to the instruction of the control card 2, after the scanning of the current layer is completed, the powder returning cylinder piston 11 moves upward to push out the excess powder spread by the roller 16, the working cylinder piston 12 moves downward by one layer thickness, the roller 16 spreads powder from right to left, and then scans the required scanning area, and the above steps are repeatedly executed until the to-be-printed part is printed.

[0052] Embodiment two

[0053] As Figure 2As shown, the additive manufacturing device of the embodiment comprises a computer 1, a control card 2, a fiber head 4, a collimating mirror 5, a dynamic divergence mirror 6, a field mirror 17, a laser 3, a galvanometer system 8, a powder return cylinder, a powder return cylinder piston 11, a working cylinder, a working cylinder piston 12, a powder feeding cylinder, a powder feeding cylinder piston 13, a working cavity 14 and a roller 16. The laser 3 is a continuous laser 3, and the wavelength is 2 μm; the clear aperture of the mirror of the galvanometer system 8 is 14 mm or less, and the coating reflectivity of the X mirror and the Y mirror is 99.5% or more, the scanning speed of the galvanometer system 8 is 2 rad / s-35 rad / s, and the jump and scanning delay is 0 us-1500 us;

[0054] The laser 9 is emitted from the fiber head 4 into the collimating mirror 5, and the laser 9 becomes parallel light after passing through the collimating mirror 5, and then is incident into the galvanometer system 8 and the field mirror 17 in sequence, and then the current layer of the working area 10 is selectively scanned under the action of the galvanometer system 8 and the field mirror 17. After the current layer is scanned, the powder return cylinder piston 11 moves upward to eject the excess powder laid by the roller 16, the working cylinder piston 12 moves downward by one layer thickness, the roller 16 lays powder from right to left, and then the required scanning area is scanned, and the above steps are cyclically executed until the printing of the to-be-printed part is completed.

[0055] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0056] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical path system of an additive manufacturing device, characterized in that: The invention comprises a laser and a galvanometer system. The laser is a continuous laser with a wavelength of 2 μm. The aperture of the lens of the galvanometer system is 25 mm or less. The coating reflectivity of the X lens and the Y lens of the galvanometer system are both above 85%. The scanning speed of the galvanometer system is 2 rad / s-35 rad / s.

2. The optical path system of the additive manufacturing equipment according to claim 1, characterized in that: The optical path system also includes a collimating mirror, a dynamic diverging mirror and a focusing mirror. The laser includes an optical fiber head, so that the laser emitted by the laser enters the collimating mirror from the optical fiber head. After the laser is converted into parallel light by the collimating mirror, the laser is emitted to the dynamic diverging mirror, and under the action of the dynamic diverging mirror, it is emitted to the focusing mirror in a diverging form, and then emitted to the galvanometer system in a converging form, and then the working area is selectively scanned under the action of the galvanometer system.

3. The optical path system of the additive manufacturing equipment according to claim 1, characterized in that: The optical path system also includes a collimator and a field lens. The laser includes an optical fiber head, so that the laser emitted by the laser enters the collimator from the optical fiber head. After the laser is converted into parallel light by the collimator, it enters the galvanometer system and the field lens in sequence, and then the working area is selectively scanned under the action of the galvanometer system and the field lens.

4. The optical path system of the additive manufacturing equipment according to claim 2 or 3, characterized in that: The coating reflectivity of the X lens and the Y lens of the galvanometer system is both above 99.5%.

5. The optical path system of the additive manufacturing equipment according to claim 4, characterized in that: The clear aperture of the lens of the galvanometer system is 14 mm or less.

6. The optical path system of the additive manufacturing equipment according to claim 1, characterized in that: The laser is a fiber laser, a solid laser, or a semiconductor laser.

7. The optical path system of the additive manufacturing equipment according to claim 6, characterized in that: The laser is a thulium-doped fiber laser with a wavelength.

8. The optical path system of the additive manufacturing equipment according to claim 1, characterized in that: The galvanometer system is a two-dimensional galvanometer or a three-dimensional galvanometer.

9. An additive manufacturing device, characterized in that: The optical path system comprises the optical path system according to any one of claims 1 to 8, and is used for selectively scanning the polymer composite powder material in the working area.

10. The additive manufacturing device according to claim 9, characterized in that The additive manufacturing equipment also includes a computer and a control card. The computer slices the three-dimensional model of the to-be-printed part layer by layer to obtain all slice data, and transmits the slice data to the control card. The control card controls the movement of the galvanometer system by outputting digital signals, so that the laser emitted by the laser is deflected under the movement of the galvanometer system, thereby selectively scanning the polymer composite powder material in the working area.

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