3D printing method, laser output device and 3D printing equipment applying same

Abstract

The invention provides a 3D printing method, a laser output device and 3D printing equipment applying the same, the 3D printing method applies the laser output device, the laser output device is configured to be capable of selectively emitting continuous laser and pulse laser, and the method comprises the steps that a CL slice data file is analyzed; and whether the data needing to be executed currently is a skin or not is judged, if yes, the pulse laser conducts skin cleaning according to the preset laser parameters and the scanning speed, and if not, the continuous laser conducts entity printing according to the preset laser parameters and the printing parameters. By judging whether the currently printed data is the skin or the entity, switching of continuous laser and pulse laser, continuous laser printing of the entity, high-power rapid prototyping, production efficiency improvement, skin cleaning through pulse laser, cleaning of the whole surface of a product and product smoothness and precision improvement are achieved; the printing efficiency is guaranteed, the surface bonding strength and hardness are guaranteed, the product quality and the production efficiency are improved, and the production cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing method, a laser output device and a 3D printing device using the same. Background Art

[0002] 3D printing technology is a new material forming technology for printing products based on the idea of ​​discrete stacking. Its principle is to first establish a three-dimensional model of the product, then perform layering and path planning on the three-dimensional model according to a certain layer thickness and line width, and finally print the product layer by layer according to the planned path. 3D printing is a layer-by-layer printing technology, and each layer is called a slice.

[0003] In the 3D printing process, metal powder is laid in the molding cavity. During the printing process, the metal powder melts and cools after reaching the melting point to achieve molten deposition molding. During the melting and cooling process, due to the temperature gradient caused by heat conduction, powder particles that are not completely melted are easily adhered to the surface of the product, resulting in a rough surface of the molded product, affecting the product accuracy.

[0004] At present, in order to solve the problem of product roughness, the following methods are usually used:

[0005] 1. Reduce laser energy input. Although this method can reduce the adhesion of some powder particles to the product surface, reducing laser energy input will lead to a decrease in printing efficiency, surface bonding strength and hardness, and reduce production efficiency and product quality.

[0006] 2. After 3D printing is completed, the outer surface of the 3D printed product is polished by physical or chemical methods. Although this method can improve the surface finish of the 3D printed product, it requires additional polishing steps, equipment and chemicals required for polishing, which increases production time and production costs; at the same time, polishing can only be performed on products that have been printed, and can only be performed on the outer surface of the product. The inner surface of the product cannot be cleaned. For special hollow structures, the cleaning process is very cumbersome and can easily damage the product surface, affecting product quality and precision. Summary of the invention

[0007] In view of the above problems, the present invention proposes a 3D printing method, a laser output device and a 3D printing device using the same.

[0008] In order to solve at least one of the above technical problems, the present invention proposes the following technical solution:

[0009] In a first aspect, a 3D printing method is provided, using a laser output device, wherein the laser output device is configured to selectively emit continuous laser light and pulsed laser light,

[0010] The 3D printing method includes the following steps:

[0011] Step 101: parsing the CL slice data file;

[0012] Step 102: determine whether the data currently to be executed is epidermis, if so, execute step 103, if not, execute step 104;

[0013] Step 103: The pulse laser cleans the epidermis according to preset laser parameters and scanning speed;

[0014] Step 104: The continuous laser performs physical printing according to preset laser parameters and printing parameters.

[0015] In an optional implementation, in step 101, reading the CL slice data file includes: acquiring the CL slice data file for parsing to obtain the coordinates of all contour points in the current CL slice data file.

[0016] In an optional implementation, in step 102, determining whether the data currently to be executed is epidermis includes: determining whether the current contour point is a boundary point, if so, determining that the current contour point is epidermis, if not, determining that the current contour point is an entity.

[0017] In an optional embodiment, the laser output device includes an optical fiber, an output head and a laser, the laser is connected to the output head via the optical fiber, and the direction of the output head is perpendicular to the printing plane.

[0018] In an optional embodiment, the laser is a MOPA laser. The MOPA laser is configured with two working modes, and can emit continuous laser and pulsed laser respectively in the two working modes.

[0019] In an optional embodiment, the laser is a double-clad ring laser, which includes a continuous laser, a MOPA pulse laser and a fiber coupler. The pigtails of the continuous laser and the MOPA pulse laser are fused through the fiber coupler. The double-clad ring laser can emit an annular spot, the outer ring of which is a continuous laser, and the inner ring of which is a pulse laser.

[0020] In an optional embodiment, the laser output device includes two lasers, two optical fibers, two output heads and an optical path coupling module.

[0021] The two lasers are continuous laser and MOPA pulse laser.

[0022] The continuous laser is connected to one output head through an optical fiber, and the MOPA pulse laser is connected to another output head through another optical fiber.

[0023] The optical path coupling module is arranged between the output head and the printing plane. The optical path coupling module enables the lasers emitted by the continuous laser and the MOPA pulse laser to be incident on the printing plane through the optical path and realizes coaxial output.

[0024] In an optional embodiment, the wavelengths of the continuous laser and the MOPA pulse laser are the same.

[0025] In a second aspect, a laser output device is provided, which is applied to any of the above-mentioned 3D printing methods.

[0026] In a third aspect, a 3D printing device is provided, applying any one of the above 3D printing methods, including:

[0027] A laser output device, used for selectively emitting continuous laser light and pulsed laser light;

[0028] Data parsing module, used to parse CL slice files;

[0029] The data judgment module is used to judge whether the data currently to be executed is epidermal;

[0030] Laser control module, used to control the opening and closing of continuous laser and pulse laser.

[0031] The beneficial effects of the present invention are:

[0032] Depending on whether the currently printed data is the epidermis or the entity, the continuous laser and pulsed laser are switched. The continuous laser is used to print the entity to achieve high-power rapid prototyping and improve production efficiency. The pulsed laser is used for epidermis cleaning to achieve cleaning of all surfaces of the product (upper surface, lower surface, inner surface and outer surface) during the printing process, thereby improving product finish and precision. There is no need to reduce the energy output of the continuous laser, which ensures printing efficiency while ensuring the surface bonding strength and hardness of the product, thereby improving product quality and production efficiency. There is no need for additional polishing steps, polishing equipment and chemicals, thus saving production time and costs. Since epidermis cleaning occurs during the printing process, the inner epidermis of the product can be cleaned, thereby improving product precision.

[0033] In addition, in the technical solution of the present invention, unless otherwise specified, the technical solution can be implemented by adopting conventional means in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flowchart of a 3D printing method provided by an embodiment of the present invention.

[0036] Figure 2 A schematic structural diagram of a laser output device in a 3D printing method provided in one embodiment of the present invention.

[0037] Figure 3 A schematic structural diagram of another laser output device in a 3D printing method provided by an embodiment of the present invention.

[0038] Figure 4 A schematic diagram of another laser output device outputting a light spot in a 3D printing method provided by an embodiment of the present invention.

[0039] Figure 5 A schematic structural diagram of another laser output device in a 3D printing method provided by an embodiment of the present invention.

[0040] Figure 6 for Figure 5 The figure shows a schematic structural diagram of a laser output device in a 3D printing method provided by an embodiment of the present invention.

[0041] Figure 7 A schematic structural diagram of a 3D printing device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the present invention, and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or devices.

[0044] Embodiment 1:

[0045] Reference Manual Attached Figure 1-2 , shows a 3D printing method provided by an embodiment of the present invention. The 3D printing method uses a laser output device, which is configured to selectively emit continuous laser light and pulsed laser light.

[0046] The 3D printing method specifically includes the following steps:

[0047] Step 101: parsing the CL slice data file;

[0048] Step 102: determine whether the data currently to be executed is epidermis, if so, execute step 103, if not, execute step 104;

[0049] Step 103: The pulse laser cleans the epidermis according to preset laser parameters and scanning speed;

[0050] Step 104: The continuous laser performs physical printing according to preset laser parameters and printing parameters.

[0051] Wherein, in step 101, reading the CL slice data file may include:

[0052] Obtain the CL slice data file for parsing and obtain the coordinates of all contour points in the current CL slice data file.

[0053] At present, the common 3D printing method is to slice the 3D model of the product to be printed in the Z-axis direction. Specifically, the model is placed on the XY plane. The Z-axis corresponds to the model height. An XY plane is used to intersect the model at a certain height to make slices. The distance between layers can be called the layer height. After all the layers are sliced, the contour line of the 3D model on each layer is obtained. The contour line data can be obtained by reading the CL slice data file. The contour line data will at least include the number of contour line midpoints and the coordinates of each contour point.

[0054] In step 102, determining whether the data currently to be executed is epidermal may include:

[0055] Determine whether the current contour point is a boundary point. If so, determine that the current contour point is the epidermis. If not, determine that the current contour point is an entity.

[0056] Specifically, after obtaining the coordinates of the contour point, it is possible to determine whether the current contour point is located at the epidermis based on the coordinates of the current contour point. The epidermis may include the outer epidermis, inner epidermis, upper epidermis, and lower epidermis. In this application, epidermis and entity are a corresponding set of concepts. The epidermis refers to the interface between the product and the molten pool and the powder in the powder bed when the 3D printed product is printed layer by layer, that is, the boundary point. The entity refers to the other contour points of the 3D printed product except the boundary points. Since 3D printing is a molten deposition process, there will be adsorption of semi-molten powder particles at all epidermises. When the contour point is the epidermis, the epidermis needs to be cleaned. If the contour point is a solid, solid printing is required.

[0057] The laser output device may include an optical fiber 1, an output head 2 and a laser 3. The laser 3 is connected to the output head 2 via the optical fiber 1. The direction of the output head 2 is perpendicular to the printing plane.

[0058] In this embodiment, the laser output device can use a MOPA laser, and the MOPA laser is connected to the output head through an optical fiber, and the direction of the output head is perpendicular to the printing plane. The MOPA laser is configured with two working modes, one working mode outputs continuous laser, and the other working mode outputs pulsed laser. Therefore, when the judgment result in step 102 is that the current printing data is epidermis, the continuous laser working mode is turned off, the pulsed laser working mode is turned on, and the pulsed laser performs epidermis cleaning according to the preset laser parameters and scanning speed. If the judgment result in step 102 is that the current printing data is entity, the pulsed laser working mode is turned off, the continuous laser working mode is turned on, and the continuous laser performs entity printing according to the preset laser parameters and printing parameters.

[0059] A MOPA laser is used, and two working modes of continuous laser and pulsed laser are configured. First, the MOPA laser can ensure that the wavelength of the output continuous laser and pulsed laser is the same, the propagation and focusing refractive index of the two lasers in the optical device are the same, the focusing focal length is the same, the action surface of the two lasers does not need to be adjusted during 3D printing, the printing process is simple and convenient, and no additional operation is required; secondly, the laser output in the two working modes can achieve coaxial output, so that the focus point position of the laser on the printing plane overlaps, and will not be offset by the vibration and temperature of the environment, thereby improving the quality of physical printing and the quality of epidermal cleaning. The trajectory control of 3D printing is simple and efficient, with stable accuracy, and does not require real-time detection and compensation of the dual laser focus position, thereby reducing the cost of 3D printing; finally, the frequency of the pulsed laser working mode in the MOPA laser is high, which is at the nanosecond level, which can improve the cleaning efficiency, and the pulse energy is moderate, which is at the micro-focus level. The pulse energy can be easily adjusted to a suitable size, which will not damage the product surface during epidermal cleaning, and improve the surface finish of the product. The MOPA laser adopts optical fiber transmission, which is small in size, low in cost, easy to couple, and easy to set in the 3D printing equipment.

[0060] In an optional embodiment, in the continuous laser working mode, the preset laser parameters may include power, and the preset printing parameters may include printing speed. The power may be set to 250W-400W, generally 350W, and the printing speed may be set to 300mm / s-1200mm / s, generally 800mm / s. The specific parameter settings may be adjusted according to different printing materials.

[0061] In an optional embodiment, in the pulse laser working mode, the preset laser parameters may include power and frequency, and the preset scan may include a printing speed, wherein the frequency may be set to 200KHz, the power may be adaptively set according to actual conditions, and the scanning speed may be set to 3000mm / s.

[0062] Embodiment 2:

[0063] Reference Manual Attached Figure 1 , Instruction Manual Figure 3 And the instruction manual Figure 4 , shows a 3D printing method provided by an embodiment of the present invention, which uses a laser output device configured to selectively emit continuous laser and pulsed laser.

[0064] The 3D printing method specifically includes the following steps:

[0065] Step 101: parsing the CL slice data file;

[0066] Step 102: determine whether the data currently to be executed is epidermis, if so, execute step 103, if not, execute step 104;

[0067] Step 103: The pulse laser cleans the epidermis according to preset laser parameters and scanning speed;

[0068] Step 104: The continuous laser performs physical printing according to preset laser parameters and printing parameters.

[0069] Specifically, the laser output device may include an optical fiber 1, an output head 2 and a laser 3. The laser 3 is connected to the output head 2 via the optical fiber 1, and the direction of the output head 2 is perpendicular to the printing plane.

[0070] Among them, the laser 3 is a double-clad ring laser, which includes a continuous laser 31, a MOPA pulse laser 32 and a fiber coupler 33. The pigtails of the continuous laser 31 and the MOPA pulse laser 32 are fused through the fiber coupler 33. The double-clad ring laser can emit an annular spot, the outer ring of the annular spot is a continuous laser, and the inner ring of the annular spot is a pulse laser. The continuous laser and the pulse laser output by the double-clad ring laser are coaxial. Please refer to the appendix of the manual for details. Figure 4 shown.

[0071] Therefore, when the judgment result in step 102 is that the current printing data is the epidermis, the continuous laser 31 is turned off and the MOPA pulse laser 32 is turned on. At this time, the outer ring of the annular spot does not output laser, and the inner ring of the annular spot outputs pulse laser. The MOPA pulse laser 32 performs epidermis cleaning according to the preset laser parameters and scanning speed. If the judgment result in step 102 is that the current printing data is entity, the MOPA pulse laser 32 is turned off and the continuous laser 31 is turned on. At this time, the outer ring of the annular spot outputs continuous laser, and the inner ring of the annular spot does not output laser. The continuous laser 31 performs entity printing according to the preset laser parameters and printing parameters.

[0072] By selectively emitting pulsed laser and continuous laser through double-clad ring laser, the technical effects achieved are as follows:

[0073] First, the two lasers have the same wavelength, so the two lasers have the same propagation and focusing refractive index in optical devices, the same focusing focal length, and the action surfaces of the two lasers do not need to be adjusted during 3D printing, and no secondary positioning is required, which improves printing efficiency and makes the printing process simple and convenient without additional operations.

[0074] Secondly, continuous laser and pulse laser can achieve coaxial output, so that the focal point position of the laser on the printing plane overlaps and will not be offset by environmental vibration, temperature, etc., thus improving the quality of physical printing and the quality of epidermis cleaning;

[0075] Again, continuous laser and pulse laser are output from the same coordinate, so the printing accuracy is higher;

[0076] Finally, the frequency of the pulse laser working mode in the MOPA laser is high, which is in the nanosecond level, which can improve the cleaning efficiency. The pulse energy is moderate, which is in the micro-focus level. The pulse energy can be easily adjusted to the appropriate size. It will not damage the product surface during epidermal cleaning and improve the surface finish of the product. The MOPA laser uses optical fiber transmission, which is small in size, low in cost, easy to couple, and easy to set up in 3D printing equipment.

[0077] In an optional embodiment, in step 103, the preset laser parameters may include power and frequency, and the preset scan may include printing speed. The frequency may be set to 200KHz, the power may be adaptively set according to actual conditions, and the scanning speed may be set to 3000mm / s.

[0078] In an optional embodiment, in step 104, the preset laser parameters may include power, and the preset printing parameters may include printing speed. The power may be set to 250W-400W, generally 350W, and the printing speed may be set to 300mm / s-1200mm / s, generally 800mm / s. The specific parameter settings may be adjusted according to different printing materials.

[0079] For technical details not described in detail in this embodiment, please refer to the method provided in Embodiment 1 of the present invention.

[0080] Embodiment 3:

[0081] Reference Manual Attached Figure 1 , Instruction Manual Figure 5 And the instruction manual Figure 6 , shows a 3D printing method provided by an embodiment of the present invention, which uses a laser output device configured to selectively emit continuous laser and pulsed laser.

[0082] The 3D printing method specifically includes the following steps:

[0083] Step 101: parsing the CL slice data file;

[0084] Step 102: Determine whether the data currently to be executed is epidermis, if so, execute step 103, if not, execute step 104;

[0085] Step 103: The pulse laser cleans the epidermis according to preset laser parameters and scanning speed;

[0086] Step 104: The continuous laser performs physical printing according to preset laser parameters and printing parameters.

[0087] Specifically, the laser output device may include an optical fiber 1, an output head 2 and a laser 3. The laser 3 is connected to the output head 2 via the optical fiber 1, and the direction of the output head 2 is perpendicular to the printing plane.

[0088] Specifically, each laser output device may include two lasers, two optical fibers, two output heads and an optical path coupling module 4 .

[0089] Among them, the two lasers are a continuous laser 31 and a MOPA pulse laser 32. The continuous laser 31 is connected to the first output head 21 through the first optical fiber 11, and the MOPA pulse laser 32 is connected to the second output head 22 through the second optical fiber 12. The optical path coupling module 4 is arranged between the first output head 21, the second output head 22 and the printing plane 5. The optical path coupling module 4 makes the lasers emitted by the continuous laser 31 and the MOPA pulse laser 32 incident on the printing plane 5 through the optical path and realize coaxial output. The wavelengths of the continuous laser 31 and the MOPA pulse laser 32 are the same.

[0090] In an optional embodiment, the first output head 21 and the second output head 22 may be arranged on both sides of the optical path coupling module 4, and the optical path coupling module 4 may include a reflector 41, a first focusing mirror 42, a second focusing mirror 43 and a third focusing mirror 44. The reflector 41 is configured as a rotatable reflector, and the reflector 41 can be rotated to realize that the reflection surface faces the first output head 21 and the second output head 22 respectively.

[0091] Specifically, the reflector 41 can be driven by a motor to rotate.

[0092] The first focusing mirror 42 is disposed between the reflecting mirror 41 and the printing plane 5 , and is used to focus the reflected light of the reflecting mirror 41 onto the printing plane 5 .

[0093] A second focusing mirror 43 may be disposed between the first output head 21 and the reflector 41. A third focusing mirror 44 may be disposed between the second output head 22 and the reflector 41.

[0094] The angles between the reflector 41, the second focusing mirror 43 and the third focusing mirror 44 and the vertical direction can be adjusted according to the actual printing environment and the printing equipment. It should be understood that the angles between the reflector 41, the second focusing mirror 43 and the third focusing mirror 44 and the vertical direction can be adjusted according to the actual printing environment and the printing equipment. Figure 5 And the instruction manual Figure 6 The relative positions of the components are merely exemplary of the specific implementation of the present invention and do not constitute a limitation on the protection scope of the present invention.

[0095] Therefore, when the result of the judgment in step 102 is that the current printing data is epidermis, the continuous laser 31 is turned off and the MOPA pulse laser 32 is turned on. Figure 5 As shown, the reflective surface of the reflector 41 faces the second output head 22, and the light is focused on the printing plane 5 through the third focusing mirror 44, the reflector 41 and the first focusing mirror 42 in sequence, and the epidermis is cleaned according to the preset laser parameters and scanning speed; if the judgment result in step 102 is that the current printing data is solid, the MOPA pulse laser 32 is turned off and the continuous laser 31 is turned on. At this time, refer to the attached manual Figure 6 As shown, the reflective surface of the reflector 41 faces the first output head 21, and the light is focused on the printing plane 5 through the second focusing mirror 43, the reflector 41 and the first focusing mirror 42 in sequence, and physical printing is performed according to the preset laser parameters and printing parameters.

[0096] The beneficial effects of the 3D printing method described in this embodiment are as follows:

[0097] First, the wavelength of the continuous laser and the MOPA pulse laser is the same, so the two lasers have the same propagation and focusing refractive index in the optical device, the same focusing focal length, and the action surface of the two lasers does not need to be adjusted during 3D printing, and no secondary positioning is required, which improves the printing efficiency and makes the printing process simple and convenient without additional operations.

[0098] Secondly, through the optical path coupling module 4, the continuous laser and the pulsed laser can be coaxially output, so that the focus position of the laser on the printing plane overlaps and will not be offset by the vibration, temperature and other factors of the environment, thereby improving the quality of physical printing and the quality of epidermis cleaning;

[0099] Finally, the frequency of the pulse laser working mode in the MOPA laser is high, which is at the nanosecond level, which can improve the cleaning efficiency. The pulse energy is moderate, which is at the micro-focus level. The pulse energy can be easily adjusted to the appropriate size and will not damage the product surface during epidermal cleaning, thereby improving the surface finish of the product. The MOPA laser uses optical fiber transmission, which is small in size, low in cost, easy to couple, and easy to set up in 3D printing equipment.

[0100] In an optional embodiment, in step 103, the preset laser parameters may include power and frequency, and the preset scanning data may include printing speed. Among them, the frequency may be set to 200KHz, the power may be adaptively set according to actual conditions, and the scanning speed may be set to 3000mm / s.

[0101] In an optional embodiment, in step 104, the preset laser parameters may include power, and the preset printing parameters may include printing speed. The power may be set to 250W-400W, generally 350W, and the printing speed may be set to 300mm / s-1200mm / s, generally 800mm / s. The specific parameter settings may be adjusted according to different printing materials.

[0102] For technical details not described in detail in this embodiment, please refer to the method provided in Embodiment 1 of the present invention.

[0103] Embodiment 4:

[0104] Reference Manual Attached Figure 2-6 , shows a laser output device, which is applied to the 3D printing method of any one of the above embodiments, and the laser output device is configured to selectively emit continuous laser and pulsed laser.

[0105] For technical details not fully described in this embodiment, reference may be made to the laser output device involved in Embodiments 1-3 of the present invention.

[0106] Embodiment 5:

[0107] Reference Manual Attached Figure 7 , showing a 3D printing device, applying any of the above 3D printing methods, including:

[0108] A laser output device 61, used for selectively emitting continuous laser light and pulsed laser light;

[0109] A data analysis module 62, used for analyzing CL slice files;

[0110] The data judgment module 63 is used to judge whether the data currently to be executed is epidermal;

[0111] The laser control module 64 is used to control the opening and closing of the continuous laser and the pulse laser.

[0112] In an optional embodiment, the 3D printing device may include a plurality of laser output devices 61 , and the plurality of laser output devices 61 form a laser array, and the laser emission direction of each laser output device 61 is perpendicular to the printing plane.

[0113] It should be understood that the device provided in this embodiment belongs to the same concept as the aforementioned method embodiment, and its specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0114] The embodiments described above are merely illustrative, wherein the units or modules described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0115] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on this understanding, the above technical solution, in essence or in other words, the part that contributes to the prior art, can be expressed in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which may be a personal computer, a server or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the corresponding technical solutions essentially deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A 3D printing method, characterized in that: A laser output device is used, wherein the laser output device is configured to selectively emit continuous laser light and pulsed laser light. The 3D printing method comprises the following steps: Step 101: parsing the CL slice data file; Step 102: determine whether the data currently to be executed is epidermis, if so, execute step 103, if not, execute step 104; Step 103: The pulse laser cleans the epidermis according to preset laser parameters and scanning speed; Step 104: The continuous laser performs physical printing according to preset laser parameters and printing parameters.

2. The 3D printing method according to claim 1, characterized in that: In step 101, reading the CL slice data file includes: Obtain the CL slice data file for parsing and obtain the coordinates of all contour points in the current CL slice data file.

3. The 3D printing method according to claim 1, characterized in that: In step 102, determining whether the data currently to be executed is epidermal includes: Determine whether the current contour point is a boundary point. If so, determine that the current contour point is the epidermis. If not, determine that the current contour point is an entity.

4. The 3D printing method according to claim 1, characterized in that: The laser output device comprises an optical fiber, an output head and a laser. The laser is connected to the output head via the optical fiber, and the direction of the output head is perpendicular to the printing plane.

5. The 3D printing method according to claim 4, characterized in that: The laser is a MOPA laser, and the MOPA laser is configured with two working modes, and can emit continuous laser and pulsed laser respectively in the two working modes.

6. The 3D printing method according to claim 4, characterized in that: The laser is a double-clad ring laser, which includes a continuous laser, a MOPA pulse laser and a fiber coupler. The pigtails of the continuous laser and the MOPA pulse laser are fused through the fiber coupler. The double-clad ring laser can emit an annular light spot, the outer ring of which is a continuous laser, and the inner ring of which is a pulse laser.

7. The 3D printing method according to claim 4, characterized in that: The laser output device includes two lasers, two optical fibers, two output heads and an optical path coupling module. The two lasers are a continuous laser and a MOPA pulse laser. The continuous laser is connected to an output head via an optical fiber, and the MOPA pulse laser is connected to another output head via another optical fiber. The optical path coupling module is arranged between the output head and the printing plane. The optical path coupling module enables the lasers emitted by the continuous laser and the MOPA pulse laser to be incident on the printing plane through the optical path and realizes coaxial output.

8. The 3D printing method according to claim 6 or 7, characterized in that: The wavelengths of the continuous laser and the MOPA pulse laser are the same.

9. A laser output device, applied to the 3D printing method according to any one of claims 1 to 8, characterized in that: Configured to selectively emit continuous laser light and pulsed laser light.

10. A 3D printing device, using the 3D printing method according to any one of claims 1 to 8, characterized in that: include: A laser output device, used for selectively emitting continuous laser light and pulsed laser light; Data parsing module, used to parse CL slice files; The data judgment module is used to judge whether the data currently to be executed is epidermal; Laser control module, used to control the opening and closing of continuous laser and pulse laser.

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