3D printing device based on multiple laser beams

Abstract

The present invention discloses a 3D printing device based on multiple laser beams, which belongs to the field of additive manufacturing technology. The 3D printing device based on multiple laser beams includes a slurry output head, a laser generator and a substrate. The slurry output head is arranged corresponding to a photocuring area so that the slurry outputted by the slurry output head on the substrate is placed in the photocuring area. The 3D printing device based on multiple laser beams provided by the present invention forms multiple laser lines that can enclose a closed area to cure the photocurable material outputted into the closed area, without the need for focusing operation, which effectively reduces the difficulty of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of photocuring additive manufacturing, and in particular to a 3D printing device based on multiple laser beams. Background Art

[0002] 3D printing (also known as additive manufacturing or layered manufacturing) is a technology that uses digital model files as the basis and uses bondable materials such as powdered metal or plastic to construct objects by printing layer by layer. 3D printing has a profound impact on traditional process flows, production lines, factory models, and industrial chain combinations, and is a representative disruptive technology in the manufacturing industry.

[0003] In the prior art, the SLA (Stereo lithography Appearance, SLA) photocuring technology is more commonly used in 3D printing. The working principle of SLA photocuring technology is to use a single laser beam as an exposure light source to cure photosensitive resin. Its equipment includes a single laser source set on a lifting workbench and an open receiving tank. The raw materials used include photosensitive resin. During the processing, the liquid photosensitive resin is placed in the resin tank. The lifting workbench drives the single laser source down to a height of a cross-section layer thickness below the liquid surface. The focused laser beam is used to scan along the liquid surface under computer control. The resin in the scanned area is cured, and then the lifting workbench is lowered again and scanned again. This process is repeated to process and shape the product.

[0004] However, the 3D printing device using the SLA principle uses a single laser beam as a point light source to solidify the photosensitive resin. During operation, the irradiation focus of the single laser beam needs to be accurately focused, which makes the operation of 3D printing using this 3D printing device very difficult and the printing accuracy is relatively low. Summary of the invention

[0005] The present invention provides a 3D printing device based on multiple laser beams, which can effectively solve the above or other potential technical problems.

[0006] The first aspect of the present invention is to provide a 3D printing device based on multiple laser beams, including a slurry output head, a laser generator and a substrate. The slurry output head is used to output a photocurable material onto the substrate. The substrate is used to receive the output photocurable slurry. The laser generator is used to emit a plurality of line lasers in a linear shape, and the plurality of line lasers enclose a closed photocurable area on the substrate. The slurry output head is arranged corresponding to the photocurable area so that the slurry outputted by the slurry output head on the substrate is placed in the photocurable area.

[0007] In an optional embodiment according to the first aspect, the laser generator includes two cross lasers, the two cross lasers are arranged opposite to each other, and the line lasers emitted by the two cross lasers enclose a rectangular light-curing area. It should be noted that the use of two cross lasers to enclose a rectangular light-curing area uses fewer laser generators, saves costs, and can also achieve a closed light-curing area.

[0008] In an optional embodiment according to the first aspect, the laser generator includes three straight lasers, and the line lasers emitted by the three straight lasers enclose a triangular light-curing area; and / or, the laser generator includes a cross laser and a straight laser, and the line lasers emitted by the cross laser and the straight laser enclose a triangular light-curing area. It should be noted that by setting three straight lasers, the three straight lasers can be adjusted to a suitable triangular shape as required. It should also be noted that the triangular light-curing area enclosed in this way has a simple structure, uses fewer laser generators, and has fewer light lines in the closed light-curing area, which can effectively save light and laser generators.

[0009] In an optional embodiment according to the first aspect, the three lasers are arranged on a plane parallel to the substrate; the three lasers are arranged at an angle of 120° with the slurry output head as the axis; the three lasers are arranged at equal intervals. It should be noted that through the adjustment in the above manner, the triangular photocuring area formed by the three lasers is an equilateral triangle, and the formed area is more closely attached to the edge of the slurry when the number of light lines is minimized.

[0010] In an optional embodiment according to the first aspect, the multi-beam laser-based 3D printing device also includes a slurry barrel, the slurry barrel is used to store photocurable slurry, the slurry output head is connected to the slurry barrel, and the three one-line lasers are rotatably connected to the outer wall of the slurry barrel. It should be noted that the slurry barrel is provided to facilitate the storage of photocurable slurry, which can effectively avoid the abnormal curing phenomenon caused by the slurry being placed in natural light for a long time, effectively ensure the stability of the photocurable slurry, and at the same time ensure the processing accuracy. And the slurry output head is connected to the slurry barrel, which is convenient for outputting the slurry in the slurry barrel to the slurry output head, and discharging the material through the slurry output head. It should be noted that after the three one-line lasers are rotatably installed on the material barrel, the angle between the line laser and the substrate can be changed by rotating the one-line laser, thereby adjusting the size of the area of ​​the enclosed closed area.

[0011] In an optional embodiment according to the first aspect, the outer side wall of the slurry barrel is provided with three connecting rods and three connecting shafts, the connecting rods are provided with two connecting holes, the axis of the connecting holes is parallel to the substrate, and the connecting shafts penetrate the connecting holes and the one-word laser, so that the one-word laser can rotate around the connecting shafts. It should be noted that the rotatable connection of the one-word laser is achieved by using an axle pin connection, and this method has a simple structure and is easy to install and subsequently maintain.

[0012] In an optional embodiment according to the first aspect, a pushing piece is provided in the slurry barrel, and the pushing piece is used to push the photocurable slurry in the slurry barrel to the slurry outlet head; and / or the slurry barrel is made of opaque material. It should be noted that the provision of a pushing piece facilitates the pushing of the photocurable slurry in the slurry barrel to the slurry outlet head. The slurry barrel is made of opaque material, which can effectively prevent natural light from irradiating the slurry in the slurry barrel, causing abnormal curing or deterioration. Made of opaque material, it can effectively block ultraviolet rays in natural light.

[0013] In an optional embodiment according to the first aspect, the pusher comprises a linear push rod and a piston plate, the linear push rod is drivingly connected to the piston plate so that the piston plate slides along the depth direction of the slurry barrel; and / or the outer wall of the slurry barrel is coated with black paint. It should be noted that during the implementation process, the linear push rod pushes the piston rod to slide along the depth direction of the slurry barrel, so as to push the light-cured slurry in the slurry barrel to the slurry output head and output it, thereby realizing the discharge. The method of applying black paint on the outer wall of the slurry barrel is simple to operate and convenient for shielding natural light.

[0014] In an optional embodiment according to the first aspect, the slurry outlet head is configured as a conical tubular structure; and / or the slurry outlet head is provided with a switch valve for controlling the discharge of the slurry. It should be noted that the slurry outlet head is configured as a conical tubular structure to facilitate smoother slurry discharge and prevent the slurry from hanging on the inner wall of the tube of the slurry outlet head. The switch valve is provided to facilitate control of whether the slurry outlet head outputs slurry, and to facilitate opening or closing the output of slurry.

[0015] In an optional embodiment according to the first aspect, the material of the substrate is an aluminum plate, an iron plate or an ABS plastic plate; and / or the slurry output head is made of a black soft rubber material. It should be noted that the substrate needs to have a flat work surface to facilitate detachment after the processing is completed. And setting the substrate as an aluminum plate, an iron plate or an ABS plastic plate can avoid it from reacting with the line laser or the photocuring slurry. It can avoid the phenomenon that natural light penetrates the slurry output head and irradiates the photocuring slurry inside the slurry output head, causing the slurry to solidify and causing the slurry output head to be blocked. At the same time, the slurry output head is made of a soft rubber material, which can effectively avoid scratching the workpiece during the printing process.

[0016] The 3D printing device based on multiple laser beams provided in the embodiment of the present disclosure includes a slurry output head, a laser generator and a substrate. The laser generator is used to emit multiple laser lines in a linear shape, and the multiple laser lines are enclosed on the substrate to form a closed light-curing area. The slurry output head is arranged corresponding to the light-curing area so that the slurry output on the substrate by the slurry output head is placed in the light-curing area. During the printing process, the printing accuracy depends on the operation accuracy of the slurry output head. During the operation of the slurry output head, the laser generator is operated accordingly. Since the output light-curing slurry is placed in the closed light-curing area, as the slurry output head is operated, the laser line can be scanned to the light-curing slurry and solidify it. The laser generator used in the present disclosure emits a laser line, which can be enclosed into a closed light-curing area, so the focusing accuracy of the laser generator is not required to be high, and even if the laser line is offset during operation, it will not affect the accuracy of printing. At the same time, the slurry extruded by the slurry output head can be quickly irradiated and solidified, without any liquid slurry residue, and the cleaning process is eliminated after printing.

[0017] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the embodiments of the present invention will become more easily understood through the following detailed description with reference to the accompanying drawings, in which several embodiments of the present invention will be described by way of example and not limitation, wherein:

[0019] Figure 1 A schematic diagram of the overall structure of a multi-laser based 3D printing device in a first state provided by an embodiment of the present disclosure;

[0020] Figure 2 A schematic diagram of the overall structure of a multi-laser based 3D printing device in a second state provided by an embodiment of the present disclosure;

[0021] Figure 3 A schematic structural diagram of a material pusher of a multi-laser-based 3D printing device provided in an embodiment of the present disclosure.

[0022] Reference numerals:

[0023] 11- slurry outlet head; 111- switch valve;

[0024] 12-slurry cylinder; 121-push member;

[0025] 123- linear push rod; 125- piston plate;

[0026] 127-upper cover; 128-screw;

[0027] 130-one-word laser;

[0028] 131-light curing area; 132-connecting rod;

[0029] 133-connecting shaft; 15-base plate. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] It should be understood that the following embodiments do not limit the execution order of the steps in the method protected by the present invention. The steps of the method of the present invention can be executed in any possible order and in a cyclic manner without being contradictory.

[0032] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0036] In the prior art, 3D printing devices using the SLA principle use a single laser beam as a point light source to solidify photosensitive resin. During operation, the irradiation focus of the single laser beam needs to be accurately focused, which makes the operation of 3D printing using this 3D printing device very difficult and the printing accuracy is relatively low. The industry has adopted various methods to try to improve the processing accuracy of products, but the results are relatively limited, so this has become one of the bottlenecks affecting the development of the industry.

[0037] After detailed observation and analysis of existing 3D printing devices using the SLA principle, the applicant of the present disclosure found that the use of point light source irradiation curing requires accurate focusing of the irradiation focus of a single laser beam, which increases the difficulty of 3D printing operations. In addition, during the printing process, a slight focus offset will greatly affect the printing accuracy.

[0038] In view of this, the applicant of the present disclosure uses a laser generator to emit linear laser to enclose a closed area, which can completely scan and solidify the output slurry, greatly reducing the focus requirement of the laser generator, thereby effectively ensuring the processing accuracy.

[0039] Specifically, the 3D printing device based on multiple laser beams provided in the embodiment of the present disclosure includes a slurry output head, a laser generator and a substrate. The laser generator is used to emit multiple lines of laser light released in a linear shape, and the multiple lines of laser light enclose a closed light-curing area on the substrate. The slurry output head is arranged corresponding to the light-curing area so that the slurry output on the substrate by the slurry output head is placed in the light-curing area. During the printing process, the printing accuracy depends on the operation accuracy of the slurry output head. During the operation of the slurry output head, the laser generator runs accordingly. Since the output light-curing slurry is placed in the closed light-curing area, as the slurry output head runs, the laser line can be scanned to the light-curing slurry and solidify it. The laser generator used in the present disclosure emits a laser line, which can be enclosed into a closed light-curing area, so the focusing accuracy of the laser generator is not required to be high, and even if the laser line is offset during operation, it will not affect the accuracy of printing. At the same time, the slurry extruded by the slurry output head can be quickly irradiated and solidified, without any liquid slurry residue, and the cleaning process is eliminated after printing.

[0040] Figure 1 This is a schematic diagram of the overall structure of the multi-laser based 3D printing device provided in an embodiment of the present disclosure in a first state. Figure 2 This is a schematic diagram of the overall structure of the multi-beam laser 3D printing device provided by the embodiment of the present disclosure in the second state. Figure 1 as well as Figure 2 The 3D printing device based on multiple laser beams provided in the embodiment of the present disclosure includes a slurry output head 11, a laser generator and a substrate 15. The slurry output head 11 is used to output the photocurable material to the substrate 15. The substrate 15 is used to receive the output photocurable slurry. The laser generator is used to emit a plurality of line lasers released in a linear shape, and the plurality of line lasers enclose a closed photocurable area 131 on the substrate 15. The slurry output head 11 is arranged corresponding to the photocurable area 131, so that the slurry outputted by the slurry output head 11 on the substrate 15 is placed in the photocurable area 131.

[0041] It should be noted that the multi-beam laser-based 3D printing device provided in the present disclosure uses laser irradiation to achieve curing processing of photocurable materials. Therefore, compared with the liquid photosensitive resin used in SLA photocuring technology and DLP photocuring technology, its processing material is not limited to the liquid photosensitive resin in the traditional sense, but can also be a slurry formed by doping other powders (such as ceramic powder, metal powder, graphene powder, etc.) or organic / inorganic solvents (ethanol, acetone, living biological cells, tissue culture fluid, etc.) in the photosensitive resin, and the slurry has the same photocuring properties as the photosensitive resin.

[0042] The slurry output head 11, the slurry output head 11 can be set as a conical tubular structure. It should be noted that the slurry output head 11 is set as a conical tubular structure to facilitate smoother output of the slurry and prevent the slurry from hanging on the inner wall of the tube of the slurry output head 11. It can be understood that the specific shape of the slurry output head 11 is not limited here. In other specific embodiments, the slurry output head 11 can also be set to other shapes according to user needs, such as a circular tubular structure. Exemplarily, the slurry output head 11 is made of black soft rubber material, which can prevent natural light from penetrating the slurry output head 11 and irradiating the light-cured slurry inside the slurry output head 11, causing the slurry to solidify and causing the slurry output head 11 to be blocked. At the same time, the slurry output head 11 is made of soft rubber material, which can effectively avoid scratching the workpiece during the printing process.

[0043] Exemplarily, the aperture of the opening of the slurry outlet head 11 is 0.5 mm to 2 mm, that is, the line width of the output slurry is 0.5 mm to 2 mm. It can be understood that the aperture of the opening of the slurry outlet head 11 is not limited here. In other specific embodiments, the aperture of the opening of the slurry outlet head 11 can be set to other values ​​according to user needs.

[0044] Exemplarily, in this embodiment, the slurry output head 11 is provided with a switch valve 111 for controlling the output of the material. It should be noted that the switch valve 111 is provided to facilitate control of whether the slurry output head 11 outputs slurry, and to facilitate opening or closing the output of slurry.

[0045] In the prior art, the SLA light-curing technology is used. During the printing process, the workpiece is immersed in a tank of liquid resin, which requires a high amount of resin, and long-term immersion is not conducive to the molding accuracy of 3D printing. At the same time, the photosensitive resin is placed in an open tank, and abnormal curing will occur if it is exposed to natural light for a long time, affecting the printing effect. At the same time, the DLP light-curing technology is used. During the printing process, the photosensitive resin is placed in an open tank, and abnormal curing will occur if it is exposed to natural light for a long time, affecting the printing effect.

[0046] In view of this, in an optional exemplary embodiment of the present disclosure, the 3D printing device based on multiple laser beams further includes a slurry barrel 12, which is used to store photocurable slurry, and the slurry output head 11 is connected to the slurry barrel 12. It should be noted that the slurry barrel 12 is provided to facilitate the storage of photocurable slurry, which is safer than the SLA and DLP method of placing the slurry in an open tank, and can effectively avoid the abnormal curing phenomenon caused by the slurry being placed in natural light for a long time, effectively ensure the stability of the photocurable slurry, and at the same time ensure the processing accuracy. The slurry output head 11 is connected to the slurry barrel 12, which facilitates the output of the slurry in the slurry barrel 12 to the slurry output head 11, and the material is discharged through the slurry output head 11.

[0047] Exemplarily, the slurry barrel 12 is made of a light-proof material. It should be noted that the slurry barrel 12 is made of a light-proof material, which can effectively prevent natural light from irradiating the slurry in the slurry barrel 12, causing abnormal solidification or deterioration. Made of a light-proof material, it can effectively block ultraviolet rays in natural light. Exemplarily, the outer wall of the slurry barrel 12 is coated with black paint. The method of applying black paint to the outer wall of the slurry barrel 12 is simple to operate and easy to block natural light.

[0048] Figure 3 This is a schematic diagram of the structure of a pusher of a 3D printing device based on multiple laser beams provided in an embodiment of the present disclosure. Figure 3 In an optional exemplary embodiment, a pusher 121 is provided in the slurry barrel 12, and the pusher 121 is used to push the photocurable slurry in the slurry barrel 12 to the slurry outlet head 11. It should be noted that the pusher 121 is provided to facilitate pushing the photocurable slurry in the slurry barrel 12 to the slurry outlet head 11. Exemplarily, the pusher 121 includes a linear push rod 123 and a piston plate 125, and the linear push rod 123 is transmission-connected to the piston plate 125 so that the piston plate 125 slides along the depth direction of the slurry barrel 12. It should be noted that during the implementation process, the linear push rod 123 pushes the piston rod to slide along the depth direction of the slurry barrel 12, so that the photocurable slurry in the slurry barrel 12 is pushed to the slurry outlet head 11 and output, thereby realizing the discharge. It can be understood that the inner cavity of the slurry barrel 12 in the present disclosure is configured as a cylindrical structure with a regular cross-sectional shape, and the shape of the piston plate 125 is configured to be compatible with the cross-section of the inner cavity of the barrel, so that the edge of the piston plate 125 can abut against the inner wall of the barrel so that the piston plate 125 can effectively push the material.

[0049] Exemplarily, the linear push rod 123 is fixedly connected to the upper cover 127 of the slurry barrel 12. During the discharging process, the linear push rod 123 pushes the piston plate 125, and the piston plate 125 slides downward along the inner cavity of the barrel under the action of the linear push rod 123, thereby increasing the slurry pressure of the slurry barrel 12, and then the slurry is pushed to the slurry output head 11 and output to the base plate 15. Exemplarily, the upper cover 127 is connected to the slurry barrel 12 by screws 128, so that during use, by removing the screws 128, the upper cover 127, the linear push rod 123 and the piston plate 125 are taken out to add materials into the slurry barrel 12.

[0050] In an optional exemplary embodiment, the 3D printing device based on multiple laser beams also includes a driving device, which is connected to the slurry output head 11 in a transmission manner, and is used to drive the slurry output head 11 to run along a preset path, thereby completing the processing and forming process from point to line, from line to surface, and then from surface to body. Exemplarily, the driving device can be set as three straight line output structures arranged vertically in pairs, so as to enable the slurry output head 11 to run along the X-axis, Y-axis, and Z-axis. At the same time, a driving mechanical arm can also be used to drive the slurry output head 11 to run along the X-axis, Y-axis, and Z-axis. The specific driving form can be selected according to the actual situation of the user. It should be noted that the printing format of the 3D printing device based on multiple laser beams in the present disclosure depends to a certain extent on the running stroke of the slurry output head 11, so the printing accuracy is not affected after the processing format size is enlarged.

[0051] The laser generator in the present disclosure is used to emit a plurality of line lasers released in a linear shape, and the plurality of line lasers enclose a closed light-curing area 131 on the substrate 15. Exemplarily, the laser generator includes two cross lasers, the two cross lasers are arranged opposite to each other, and the line lasers emitted by the two cross lasers enclose a rectangular light-curing area 131. It should be noted that the use of two cross lasers to enclose a rectangular light-curing area 131 uses a small number of laser generators, which saves costs, and can also achieve the enclosed closed light-curing area 131. It can be understood that the specific shape of the closed light-curing area 131 is not limited here. In other specific embodiments, the closed light-curing area 131 can also be set to other shapes by other methods according to the specific needs of the user. Exemplarily, the laser generator can be set to a laser source that emits ultraviolet light or blue-violet light, which is used to illuminate the curing slurry to cure it.

[0052] In an optional exemplary embodiment, the laser generator includes a cross laser and a straight laser, and the line lasers emitted by the cross laser and the straight laser enclose a triangular light-curing area 131. It should be noted that the triangular light-curing area 131 enclosed in this way has a simple structure, uses fewer laser generators, and the number of light lines in the closed light-curing area 131 is also less, which can effectively save light and laser generators.

[0053] In an optional exemplary embodiment, the laser generator includes three straight lasers 130, and the line lasers emitted by the three straight lasers 130 enclose a triangular light curing area 131. It should be noted that by setting three straight lasers 130, the three straight lasers 130 can be adjusted according to needs to be adjusted to a suitable triangular shape.

[0054] For example, in some examples, three straight lasers 130 can be set on a plane parallel to the substrate 15. The three straight lasers 130 are set at an angle of 120° with the slurry output head 11 as the axis. The three straight lasers 130 are set at equal intervals. In this way, the triangular photocuring area 131 formed by the three straight lasers 130 can be an equilateral triangle, and the formed area is more closely attached to the edge of the slurry when the number of light lines is minimized. It should be pointed out that the number and form of the laser generators are not limited here. In other specific embodiments, the laser generators can be selected and combined in other forms according to the needs of the user to form photocuring areas 131 of other shapes, so that the formed photocuring area 131 is a closed area.

[0055] In addition, it should be noted that the laser generator disclosed in the present invention uses laser lines to enclose a closed photocuring area 131 to cure the photocurable slurry, which can effectively prevent the laser line from irradiating the slurry output head 11, so that the light emitted by the laser generator does not directly contact the slurry output head 11, thereby avoiding the formation of solidification at the slurry output head 11 and causing blockage.

[0056] In an optional exemplary embodiment, three straight lasers 130 are rotatably connected to the outer side wall of the slurry barrel 12. It should be noted that such a configuration is convenient for installing the three straight lasers 130 on the slurry barrel. By rotating the straight laser 130, the angle between the line laser and the substrate 15 can be changed, thereby adjusting the size of the area of ​​the enclosed closed area. Exemplarily, the outer side wall of the slurry barrel 12 is provided with three connecting rods 132 and three connecting shafts 133. The connecting rod 132 is provided with two connecting holes. The axis of the connecting hole is parallel to the substrate 15. The connecting shaft 133 passes through the connecting hole and the straight laser 130, so that the straight laser 130 can rotate around the connecting shaft 133. It should be noted that the rotatable connection of the straight laser 130 is achieved by using an axle pin connection, and this method has a simple structure and is easy to install and subsequently maintain. Specifically, in this embodiment, the connecting shaft 133, the connecting rod 132 and the one-word laser 130 are arranged to be hinged, and the matching relationship is a perfect match, so that the laser can be kept at the position of the angle after being adjusted to the preset angle under the action of external force. It can be understood that the specific matching relationship between the connecting shaft 133, the connecting rod 132 and the one-word laser 130 is not limited here. In other embodiments, a positioning rod structure can also be provided. When the one-word laser 130 rotates to the preset position, the positioning rod is provided to abut the one-word laser 130 and the material barrel to keep the preset relative position between them.

[0057] The substrate 15 is used to receive the outputted photocurable slurry. For example, the substrate 15 is made of an aluminum plate, an iron plate or an ABS plastic plate. It should be noted that the substrate 15 needs to have a flat work surface to facilitate separation after the processing is completed. The substrate 15 is set as an aluminum plate, an iron plate or an ABS plastic plate to prevent it from reacting with the line laser or the photocurable slurry.

[0058] In order to further illustrate the structure of the multi-beam laser 3D printing device provided by the present disclosure, the method of performing 3D printing using the multi-beam laser 3D printing device is briefly described as follows:

[0059] Photocurable slurry is added into the slurry barrel 12, wherein the sensitive wavelength range of the photoinitiator added to the slurry needs to be consistent with the wavelength range of the laser emitted by the laser generator, so that the output slurry is cured after being irradiated by the light emitted by the laser generator.

[0060] Adjust the pusher 121 so that there is a certain pressure in the slurry tube 12, that is, the slurry fills the slurry output head, so that when printing starts, the slurry output head 11 can continuously and stably extrude the slurry without air holes and then release the pressure. After adjustment, the slurry stops flowing out.

[0061] The relative height between the slurry discharge head 11 and the substrate 15 is adjusted to ensure that the distance between the end of the slurry discharge head 11 and the substrate 15 is a preset height. Exemplarily, the distance between the end of the slurry discharge head 11 and the substrate 15 is less than 1 mm.

[0062] Open the switch valve 111, and the linear push rod 123 pushes the piston plate 125 downward, so that the slurry flows out evenly from the slurry output head 11 at a speed of 0.1 mm / s. After the slurry is output to the substrate 15, stop the movement of the linear push rod 123, close the switch valve 111, and the slurry stops flowing out.

[0063] Start the drive.

[0064] The relative angles between the three lasers and the substrate 15 are adjusted so that the laser lines and the substrate 15 are kept at a preset angle to ensure that the three laser lines intersect each other and form a regular triangle photocuring area 131 that just surrounds the slurry on the substrate 15 by the slurry output head 11.

[0065] The residual slurry on the substrate 15 is removed.

[0066] Open the switch valve 111, and the drive device drives the slurry output head 11 to start 3D printing. During the printing process, ensure that the slurry extrusion speed is consistent with the running speed of the end of the slurry output head 11. For example, if the slurry extrusion speed is xml / s and the end linear speed of the multi-axis linkage is y cm / s, then 0.8y <x<1.2y。

[0067] It can be seen that the multi-beam laser-based 3D printing device provided by the present disclosure adopts the method of injection-curing and re-injection-curing for printing, rather than the method of one-time injection-layered curing adopted in the prior art, which can effectively avoid the quality problems caused by the light-curing material being affected by stray light.

[0068] Finally, it should be noted that the above implementation modes 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 implementation modes, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present invention.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A 3D printing device based on multiple laser beams, characterized in that: It includes a slurry output head, a laser generator, a slurry cylinder and a substrate; The slurry output head is used to output the photocurable material onto the substrate; The substrate is used to receive the outputted light-curing slurry; The laser generator is used to emit a plurality of line lasers in a linear shape, and the plurality of line lasers enclose a closed light-curing area on the substrate. The laser generator includes three straight lasers, and the three straight lasers are rotatably connected to the outer wall of the slurry tube; the outer wall of the slurry tube is provided with three connecting rods and three connecting shafts, and the connecting rods are provided with two connecting holes, the axis of the connecting holes is parallel to the substrate, and the connecting shaft passes through the connecting holes and the straight lasers, so that the straight lasers can rotate around the connecting shafts; The slurry output head is arranged corresponding to the photocuring area, so that the slurry outputted by the slurry output head on the substrate is placed in the photocuring area.

2. The multi-beam laser 3D printing device according to claim 1, characterized in that: The line lasers emitted by the three in-line lasers enclose a triangular light curing area.

3. The multi-beam laser 3D printing device according to claim 2, characterized in that: The three lasers are arranged on a plane parallel to the substrate; the three lasers are arranged at an angle of 120° with the slurry output head as the axis; and the three lasers are arranged at equal intervals.

4. The multi-beam laser 3D printing device according to claim 3, characterized in that: The slurry cylinder is used to store light-curing slurry, and the slurry output head is connected to the slurry cylinder. The aperture of the opening of the slurry output head is 0.5 mm to 2 mm.

5. The multi-beam laser 3D printing device according to claim 4, characterized in that: A pushing piece is arranged in the slurry barrel, and the pushing piece is used to push the light-curing slurry in the slurry barrel to the slurry output head; and / or the slurry barrel is made of opaque material.

6. The multi-beam laser 3D printing device according to claim 5, characterized in that: The pusher comprises a linear push rod and a piston plate, wherein the linear push rod is drivingly connected to the piston plate so that the piston plate slides along the depth direction of the slurry barrel; and / or the outer side wall of the slurry barrel is coated with black paint.

7. The multi-beam laser 3D printing device according to claim 6, characterized in that: The slurry outlet head is configured as a conical tubular structure; and / or, the slurry outlet head is provided with a switch valve for controlling the discharge of the slurry.

8. The multi-beam laser 3D printing device according to any one of claims 1 to 7, characterized in that: The material of the substrate is an aluminum plate, an iron plate or an ABS plastic plate; and / or the slurry output head is made of a black soft rubber material.

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