CN111070683B - 3D printing powder laying system, 3D printing device and 3D printing powder laying method - Google Patents
3D printing powder laying system, 3D printing device and 3D printing powder laying method Download PDFInfo
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- CN111070683B CN111070683B CN201811564012.1A CN201811564012A CN111070683B CN 111070683 B CN111070683 B CN 111070683B CN 201811564012 A CN201811564012 A CN 201811564012A CN 111070683 B CN111070683 B CN 111070683B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/245—Platforms or substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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Abstract
The invention provides a 3D printing powder spreading system, a 3D printing device and a 3D printing powder spreading method, wherein the 3D printing powder spreading system comprises a disc-shaped powder spreading platform, a first cylindrical powder groove wall, a scraper rotating shaft and a plurality of main scrapers, the lower edge of the first cylindrical powder groove wall is hermetically connected to the upper surface of the disc-shaped powder spreading platform, a through hole is formed in the center of the disc-shaped powder spreading platform, the scraper rotating shaft is arranged in the through hole in a penetrating mode, one end of each of the main scrapers is fixedly connected to the scraper rotating shaft, the scraper rotating shaft drives the main scrapers to rotate in one direction, at least one powder spreading port is further formed in the disc-shaped powder spreading platform, and powder is sent out from the powder spreading port through the one-way rotation. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the fact that the scraper rotating shaft rotates in a one-way mode, the main scraper can continue to be used for spreading the powder on the next layer after the powder scraped by the previous main scraper, continuous powder spreading is achieved, and the powder utilization rate is improved.
Description
Technical Field
The invention belongs to the technical field of 3D printing additive manufacturing, and relates to a 3D printing powder laying system, a 3D printing device and a 3D printing powder laying method.
Background
Additive manufacturing, namely 3D printing technology, is a technology for forming objects by printing bondable materials such as metal, plastic, ceramic, sand and the like layer by layer on the basis of a digital model file, breaks through the processing limitation of the traditional process, and can quickly form parts with complex structures. According to the difference of consumptive material kind and pay-off mode, the technical type that 3D printing device adopted is also different, includes: stereolithography (SL), Fused Deposition Modeling (FDM), Selective Laser Melting (SLM), Selective Laser Sintering (SLs), Electron Beam Melting (EBM), Wire and Arc Additive Manufacturing (WAAM), and Laser near-Net Shaping (LENS led). The SLS, SLM and EBM processes are based on sintering or cladding of powder by adopting a laser and other heat sources after powder is spread layer by layer, and in the actual printing process, the powder spreading time can occupy 40% or even more of the whole printing process time, so that the bottleneck limiting the 3D printing efficiency is formed.
The conventional SLS, SLM and EBM devices basically include the following five basic parts: a Computer Numerical Control (CNC) system, a motion system, a heat source (generally a laser vibrating mirror or an electron beam), a 3D printing powder-laying system, and a substrate. The CNC system is used for slicing the model, generating a printing path and controlling technological parameters, the moving system is used for controlling the heat source to move in the X-axis direction and the Y-axis direction, the 3D printing powder paving system moves in the Y-axis direction and the substrate moves in the Z-axis direction, and the heat source is used for sintering a powder layer scraped by the 3D printing powder paving system, so that the consumable materials are stacked layer by layer on the printing platform.
Fig. 1 is a schematic structural diagram of a 3D printing powder spreading system in the prior art, please refer to fig. 1, in which a substrate is a metal block with a square or rectangular shape, and the substrate and the powder are generally made of the same material. In the actual printing process, a single scraper 1 of the 3D printing powder laying system moves along the Y-axis direction to compact a layer of powder on a substrate in a one-way or back-and-forth two-way mode, and the layer of powder is sintered or clad by controlling the movement of a heat source 2 along the X-axis and Y-axis directions. The scraped powder falls into the powder recovery bottle 3 for recycling. And then the substrate moves downwards by the layer thickness distance of one layer of powder along the Z axis, the scraper 1 is restored to the original position and then the next layer of powder is spread until the part is finally formed, and then the part is cut off or removed from the substrate. Because the one-way or two-way scraper 1 is static when the heat source 2 is sintered or cladded, and one or two powder recovery bottles 3 are required to be respectively arranged in front of and behind the 3D printing powder spreading system, the powder spreading period is longer (occupying more than 40% of the whole printing process time) and the powder utilization rate is lower (more than 40% of powder is scraped into the recovery bottles).
An annular 3D printing device is disclosed in the prior art, and efficient 3D printing of parts with variable sizes is realized by adjusting the diameter of a working face. But the powder feeding platform is arranged outside the powder paving platform, and the powder paving uniformity is difficult to realize. And the 3D printing device only uses a single scraper, so that the powder spreading efficiency is low, and the limitation of the application field is large.
Another fan-shaped 3D printing device is disclosed in the prior art, and the risk of scratching parts is large due to the adoption of fan-shaped reciprocating powder scraping. And 3D printing device only uses single scraper, and for two-way scraper of tradition, does not save the time of spreading the powder, does not also save the powder of spreading the powder and uses, and the application field limitation is also great.
Disclosure of Invention
One of the objectives of the present invention is to provide a 3D printing powder spreading system, a 3D printing device, and a 3D printing powder spreading method, so as to solve the problem of low powder spreading efficiency of the 3D printing powder spreading system in the prior art.
Another object of the present invention is to improve the powder spreading uniformity of a 3D printing powder spreading system.
In order to solve the technical problem, the invention provides a 3D printing powder spreading system which comprises a disc-shaped powder spreading platform, a first cylindrical powder groove wall, a scraper rotating shaft and a plurality of main scrapers, wherein the lower edge of the first cylindrical powder groove wall is hermetically connected to the upper surface of the disc-shaped powder spreading platform;
a through hole is formed in the center of the disc-shaped powder spreading table, the scraper rotating shafts penetrate through the through hole, one ends of the main scrapers are fixedly connected to the scraper rotating shafts, and the scraper rotating shafts drive the main scrapers to rotate in a single direction;
the disc-shaped powder laying platform is also provided with at least one powder laying port, and powder is conveyed out from the powder laying port through the unidirectional rotation of the main scraper.
Preferably, the powder spreading device further comprises a substrate and a substrate lifting unit, the powder spreading opening and the first cylindrical powder groove wall enclose to form a powder spreading area, and the substrate lifting unit is used for driving the substrate to move in the powder spreading area along a direction perpendicular to the upper surface of the disc-shaped powder spreading table, so that the relative distance between the upper surface of the substrate and the upper surface of the disc-shaped powder spreading table is changed.
Preferably, the powder spreading opening is in a fan shape.
Preferably, the substrate has a fan-shaped cross-section parallel to the upper surface thereof.
Preferably, the fan-shaped angle of the powder spreading opening is smaller than or equal to the fan-shaped angle of the substrate.
Preferably, the substrate has a circular or rectangular cross-sectional shape in a direction parallel to an upper surface thereof.
Preferably, the other ends of the main scrapers are attached to the inner wall of the first cylindrical powder groove, and the cutting edges of the main scrapers are attached to the upper surface of the disc-shaped powder spreading table.
Preferably, the plurality of main scrapers are uniformly distributed in a circumferential direction of an outer wall of the scraper rotating shaft.
Preferably, the powder scraping machine further comprises an auxiliary scraper and an auxiliary scraper transmission unit, wherein the auxiliary scraper transmission unit drives the auxiliary scraper to do reciprocating motion along the radial direction of the disc-shaped powder paving table, and is used for scraping powder on the front side of the main scraper in the rotating direction.
Preferably, the auxiliary scraper transmission unit is a push-pull rod unit, the push-pull rod unit is arranged on the wall of the first cylindrical powder groove in a penetrating manner, or the auxiliary scraper transmission unit is a guide rail unit or a belt transmission unit, and the auxiliary scraper transmission unit is fixed on one side wall of the front side of the main scraper in the rotation direction.
Preferably, the powder feeding device further comprises a powder feeding unit, wherein the powder feeding unit is located at the upper part of the wall of the first cylindrical powder groove and supplies powder to the disc-shaped powder spreading table according to the rotating speed of the main scraper and the powder spreading state of the 3D printing powder spreading system.
Preferably, the powder spreading machine further comprises a second cylindrical powder groove wall, wherein a plurality of clamping grooves matched with the main scrapers are formed in the second cylindrical powder groove wall, the second cylindrical powder groove wall penetrates through the scraper rotating shaft and is clamped on the main scrapers through the clamping grooves, and therefore the lower edge of the second cylindrical powder groove wall is attached to the upper surface of the disc-shaped powder spreading table.
Preferably, the powder spreading port is located in a region between the first cylindrical powder tank wall and the second cylindrical powder tank wall.
The invention also provides a 3D printing device which comprises the 3D printing powder spreading system.
The invention also provides a 3D printing powder spreading method which comprises a 3D printing powder spreading system, wherein the 3D printing powder spreading system comprises a disc-shaped powder spreading platform, a first cylindrical powder groove wall, a scraper rotating shaft, a plurality of main scrapers, a substrate and a substrate lifting unit, and the lower edge of the first cylindrical powder groove wall is hermetically connected to the upper surface of the disc-shaped powder spreading platform;
a through hole is formed in the center of the disc-shaped powder spreading table, the scraper rotating shafts penetrate through the through hole, one ends of the main scrapers are fixedly connected to the scraper rotating shafts, and the scraper rotating shafts drive the main scrapers to rotate in a single direction;
the disc-shaped powder laying platform is also provided with at least one powder laying port, and powder is sent out from the powder laying port through the unidirectional rotation of the main scraper;
the powder spreading opening and the wall of the first cylindrical powder groove are enclosed to form a powder spreading area, and the substrate lifting unit is used for driving the substrate to move in the powder spreading area along a direction vertical to the upper surface of the disc-shaped powder spreading table so as to change the relative distance between the upper surface of the substrate and the upper surface of the disc-shaped powder spreading table;
the 3D printing powder laying method comprises the following steps:
s1: the substrate lifting unit drives the substrate to move until the distance between the upper surface of the substrate and the upper surface of the disc-shaped powder laying platform is within one layer of powder laying thickness;
s2: the scraper rotating shaft drives the main scrapers to rotate in one direction to spread powder on one layer;
s3: after the layer of powder is spread and printed, the substrate lifting unit drives the substrate to descend by a distance of a layer of powder spreading thickness;
s4: and repeating the steps S2-S3 until all the powder layers are completely laid.
Preferably, the 3D printing powder spreading system further comprises a powder feeding unit, the powder feeding unit is located at the upper portion of the wall of the first cylindrical powder groove, and the powder feeding unit supplies powder to a powder spreading area on the disc-shaped powder spreading table according to the rotating speed of the main scraper and the powder spreading state of the 3D printing powder spreading system.
Preferably, the 3D printing powder laying system further includes a secondary blade and a secondary blade driving unit, and the step S2 further includes:
the auxiliary scraper transmission unit drives the auxiliary scraper to do reciprocating motion along the radial direction of the disc-shaped powder laying platform, and the auxiliary scraper transmission unit is used for scraping powder on the front side of the main scraper in the rotating direction.
Compared with the prior art, the 3D printing powder spreading system, the 3D printing device and the 3D printing powder spreading method are provided, the 3D printing powder spreading system comprises a disc-shaped powder spreading platform, a first cylindrical powder groove wall, a scraper rotating shaft and a plurality of main scrapers, the lower edge of the first cylindrical powder groove wall is connected to the upper surface of the disc-shaped powder spreading platform in a sealing mode, a through hole is formed in the center of the disc-shaped powder spreading platform, the scraper rotating shaft is arranged in the through hole in a penetrating mode, one end of each main scraper is fixedly connected to the scraper rotating shaft, the scraper rotating shaft drives the main scrapers to rotate in a single direction, the disc-shaped powder spreading platform is further provided with at least one powder spreading port, and powder is sent out from the powder spreading port through the single-direction rotation of the main scrapers. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the fact that the scraper rotating shaft rotates in a one-way mode, the main scraper can continue to be used for spreading the powder on the next layer after the powder scraped by the previous main scraper, continuous powder spreading is achieved, and the powder utilization rate is improved.
Further, still include vice scraper and vice scraper drive unit, vice scraper drive unit drives vice scraper along the radial reciprocating motion of powder platform is spread to the disc will the powder of the direction of rotation's of main scraper front side is strickleed off, has further improved the shop's powder homogeneity of 3D printing shop powder system.
The invention further provides a 3D printing device, and the 3D printing powder spreading system is adopted, so that the powder spreading efficiency and the powder utilization rate of the 3D printing powder spreading system are improved, and the printing risk is reduced.
The invention also provides a 3D printing powder laying method, the scraper rotating shaft drives the main scrapers to rotate in one direction to lay powder on one layer, so that the powder laying efficiency of the 3D printing powder laying system is improved, and meanwhile, the printing risk is reduced due to the unidirectional rotation of the scraper rotating shaft, so that the main scrapers can continue to use the powder scraped by the previous main scraper for laying powder on the next layer, the continuous powder laying is realized, and the powder utilization rate is improved.
Drawings
Fig. 1 is a schematic structural diagram of a 3D printing powder laying system in the prior art;
fig. 2 is a first schematic structural diagram of a 3D printing and powder spreading system according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram ii of a 3D printing and powder-spreading system according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a 3D printing and powder laying system according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram ii of a 3D printing and powder laying system according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram i of a 3D printing and powder spreading system provided in the third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a 3D printing and powder laying system provided in the third embodiment of the present invention;
wherein, 1-a scraper; 2-a heat source; 3-powder recovery bottle; 10-a disc-shaped powder laying platform; 11-a first cylindrical powder tank wall; 12-blade rotation axis; 13-a main scraper; 14-a substrate; 15-a substrate lifting unit; 16-a secondary scraper; 17-a secondary scraper transmission unit; 18-a powder feeding unit; 19-second cylindrical powder tank wall.
Detailed Description
The following describes a 3D printing and powder spreading system, a 3D printing device, and a 3D printing and powder spreading method according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the appended claims and the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.
Example one
Fig. 2 is a first structural schematic diagram of a 3D printing powder spreading system according to a first embodiment of the present invention, fig. 3 is a second structural schematic diagram of a 3D printing powder spreading system according to a first embodiment of the present invention, and referring to fig. 2 and fig. 3, a 3D printing powder spreading system includes a disc-shaped powder spreading table 10, a first cylindrical powder groove wall 11, a scraper rotating shaft 12, and a plurality of main scrapers 13, wherein a lower edge of the first cylindrical powder groove wall 11 is hermetically connected to an upper surface of the disc-shaped powder spreading table 10;
a through hole is formed in the center of the disc-shaped powder spreading table 10, the scraper rotating shaft 12 penetrates through the through hole, one end of each of the main scrapers 13 is fixedly connected to the scraper rotating shaft 12, and the scraper rotating shaft 12 drives the main scrapers 13 to rotate in a single direction;
the disc-shaped powder laying platform 10 is further provided with at least one powder laying port, and powder is conveyed out from the powder laying port through the unidirectional rotation of the main scraper 13. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the one-way rotation of the scraper rotating shaft 12, the main scraper 13 can continue to bear the powder scraped by the previous main scraper 13 and is continuously used for spreading the powder on the next layer, the continuous powder spreading is realized, and the powder utilization rate is improved.
Further, the powder spreading device comprises a substrate 14 and a substrate lifting unit 15, wherein the powder spreading opening and the first cylindrical powder groove wall 11 enclose to form a powder spreading area, and the substrate lifting unit 15 is used for driving the substrate 14 to move in the powder spreading area along a direction perpendicular to the upper surface of the disc-shaped powder spreading table 10, so that the relative distance between the upper surface of the substrate 14 and the upper surface of the disc-shaped powder spreading table 10 is changed.
After the layer of powder is spread, the substrate lifting unit 15 drives the substrate 14 to descend by one layer of powder spreading thickness according to the work flow, and the next layer of powder spreading is performed.
Further, the cross-sectional shape of the substrate 14 in a direction parallel to the upper surface thereof is a sector. Since the main squeegee 13 rotates, the area utilization rate of the substrate 14 is highest when the cross-sectional shape of the substrate 14 parallel to the upper surface thereof is a fan shape. Alternatively, the substrate 14 may have a circular or rectangular cross-sectional shape in a direction parallel to the upper surface thereof. It should be appreciated that such a limitation is merely used to illustrate the cross-sectional shape of the substrate 14 in a direction parallel to the upper surface thereof, and the cross-sectional shape thereof is not limited to a sector shape, and in practice, may be a circular shape or a triangular shape, etc.
Further, the fan-shaped angle of the powder spreading port is smaller than or equal to the fan-shaped angle of the substrate 14. So as to ensure that the powder in the powder spreading area is uniformly compacted and spread.
Further, the other ends of the main scrapers 13 are attached to the inner wall of the first cylindrical powder tank wall 11, and the cutting edges of the main scrapers 13 are attached to the upper surface of the disc-shaped powder spreading table 10. So as to further improve the utilization rate of the powder.
Further, the plurality of main scrapers 13 are uniformly distributed in the circumferential direction of the outer wall of the scraper rotating shaft 12. It should be appreciated that such a limitation is only used to exemplify the distribution of the main doctor blade 13 on the rotary shaft 12 of the doctor blade, and the distribution is not limited to uniform distribution, and in practice, the distribution may be set to non-uniform distribution or the like.
Further, the powder feeding device comprises a powder feeding unit 18, wherein the powder feeding unit 18 is located at the upper part of the first cylindrical powder groove wall 11, and the powder feeding unit 18 supplies powder to the disc-shaped powder paving table 10 according to the rotating speed of the main scraper 13 and the powder paving state of the 3D printing powder paving system.
Further, the rotation direction of the blade rotation shaft 12 may be set to a clockwise direction or a counterclockwise direction as required. To avoid scratching the parts and thereby reduce the risk of printing.
Example two
Fig. 4 is a first structural schematic diagram of a 3D printing and powder spreading system provided in a second embodiment of the present invention, fig. 5 is a second structural schematic diagram of a 3D printing and powder spreading system provided in the second embodiment of the present invention, please refer to fig. 4 and fig. 5, which are different from the first embodiment in that: the powder spreading machine further comprises an auxiliary scraper 16 and an auxiliary scraper transmission unit 17, wherein the auxiliary scraper transmission unit 17 drives the auxiliary scraper 16 to do reciprocating motion along the radial direction of the disc-shaped powder spreading table 10, and is used for scraping powder on the front side of the main scraper 13 in the rotating direction. Further, the powder spreading uniformity of the 3D printing powder spreading system is improved.
Further, the auxiliary scraper transmission unit 17 is a push-pull rod unit, and the push-pull rod unit is arranged on the first cylindrical powder groove wall 11 in a penetrating mode so as to ensure that powder in the powder paving area is uniformly distributed in the radial direction corresponding to the main scraper 13, and therefore the powder paving uniformity of the 3D printing powder paving system is improved.
EXAMPLE III
Fig. 6 is a first structural schematic diagram of a 3D printing and powder spreading system provided by a third embodiment of the present invention, fig. 7 is a second structural schematic diagram of a 3D printing and powder spreading system provided by a third embodiment of the present invention, please refer to fig. 6 and fig. 7, which are different from the above embodiments in that: 3D prints powder system of shop still includes second cylinder powder cell wall 19, be provided with on the second cylinder powder cell wall 19 with a plurality of 13 assorted a plurality of draw-in grooves of main scraper, second cylinder powder cell wall 19 passes scraper rotation axis 12 is through a plurality of the draw-in groove card is established a plurality of on the main scraper 13, so that the lower limb laminating of second cylinder powder cell wall 19 in the upper surface of powder platform 10 is spread to the disc. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the one-way rotation of the scraper rotating shaft 12, the main scraper 13 can continue to bear the powder scraped by the previous main scraper 13 and is continuously used for spreading the powder on the next layer, the continuous powder spreading is realized, and the powder utilization rate is improved.
Further, the cross-sectional shape of the substrate 14 in a direction parallel to the upper surface thereof is a fan shape having a fan-shaped hollow portion. The area utilization rate of the substrate 14 can be maximized.
Further, the powder spreading machine further comprises an auxiliary scraper 16 and an auxiliary scraper transmission unit 17, wherein the auxiliary scraper transmission unit 17 drives the auxiliary scraper 16 to reciprocate along the radial direction of the disc-shaped powder spreading table 10, and is used for scraping powder on the front side of the rotation direction of the main scraper 13. The auxiliary scraper transmission unit 17 is a guide rail unit or a belt transmission unit, and the auxiliary scraper transmission unit 17 is fixed on one side wall of the front side of the main scraper 13 in the rotation direction. The powder in the powder paving area is uniformly distributed in the radial direction corresponding to the main scraper 13, so that the powder paving uniformity of the 3D printing powder paving system is improved. It should be appreciated that such a limitation is only used to exemplify the transmission manner of the secondary doctor blade transmission unit 17, and the transmission manner of the secondary doctor blade transmission unit 17 may be a transmission manner such as a chain transmission, and in practice, the transmission manner of the secondary doctor blade transmission unit 17 may be set according to the requirement.
Example four
The invention also provides a 3D printing device, and the 3D printing powder spreading system is adopted. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the one-way rotation of the scraper rotating shaft 12, the main scraper 13 can continue to bear the powder scraped by the previous main scraper 13 and is continuously used for spreading the powder on the next layer, the continuous powder spreading is realized, and the powder utilization rate is improved.
EXAMPLE five
The invention also provides a 3D printing powder spreading method which comprises a 3D printing powder spreading system, wherein the 3D printing powder spreading system comprises a disc-shaped powder spreading platform 10, a first cylindrical powder groove wall 11, a scraper rotating shaft 12, a plurality of main scrapers 13, a substrate 14 and a substrate lifting unit 15, and the lower edge of the first cylindrical powder groove wall 11 is hermetically connected to the upper surface of the disc-shaped powder spreading platform 10;
a through hole is formed in the center of the disc-shaped powder spreading table 10, the scraper rotating shaft 12 penetrates through the through hole, one end of each of the main scrapers 13 is fixedly connected to the scraper rotating shaft 12, and the scraper rotating shaft 12 drives the main scrapers 13 to rotate in a single direction;
the disc-shaped powder laying platform 10 is also provided with at least one powder laying port, and powder is sent out from the powder laying port through the unidirectional rotation of the main scraper 13;
the powder spreading opening and the first cylindrical powder groove wall 11 enclose to form a powder spreading area, and the substrate lifting unit 15 is used for driving the substrate 14 to move in the powder spreading area along a direction perpendicular to the upper surface of the disc-shaped powder spreading table 10, so that the relative distance between the upper surface of the substrate 14 and the upper surface of the disc-shaped powder spreading table 10 is changed;
the 3D printing powder laying method comprises the following steps:
s1: the substrate lifting unit 15 drives the substrate 14 to move until the distance between the upper surface of the substrate 14 and the upper surface of the disc-shaped powder laying platform 10 is within one layer of powder laying thickness;
s2: the scraper rotating shaft 12 drives the main scrapers 13 to rotate in one direction to spread powder on one layer;
s3: after the layer of powder is spread and printed, the substrate lifting unit 15 drives the substrate 14 to descend by a distance of a layer of powder spreading thickness;
s4: and repeating the steps S2-S3 until all the powder layers are completely laid.
The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the one-way rotation of the scraper rotating shaft 12, the main scraper 13 can continue to bear the powder scraped by the previous main scraper 13 and is continuously used for spreading the powder on the next layer, the continuous powder spreading is realized, and the powder utilization rate is improved.
Further, the 3D printing powder spreading system further comprises a powder feeding unit 18, wherein the powder feeding unit 18 is located at the upper portion of the first cylindrical powder groove wall 11, and the powder feeding unit 18 supplies powder to a powder spreading area on the disc-shaped powder spreading table 10 according to the rotating speed of the main scraper 13 and the powder spreading state of the 3D printing powder spreading system.
Further, the 3D printing powder laying system further includes a secondary blade 16 and a secondary blade transmission unit 17, and the step S2 further includes:
the auxiliary scraper transmission unit 17 drives the auxiliary scraper 16 to reciprocate along the radial direction of the disc-shaped powder laying platform 10, so as to scrape the powder on the front side of the rotation direction of the main scraper 13. The powder spreading uniformity of the 3D printing powder spreading system can be further improved.
In summary, the invention provides a 3D printing powder spreading system, a 3D printing device and a 3D printing powder spreading method, the 3D printing powder spreading system includes a disc-shaped powder spreading table, a first cylindrical powder groove wall, a scraper rotating shaft and a plurality of main scrapers, the lower edge of the first cylindrical powder groove wall is hermetically connected to the upper surface of the disc-shaped powder spreading table, a through hole is formed in the center of the disc-shaped powder spreading table, the scraper rotating shaft is inserted into the through hole, one end of each of the main scrapers is fixedly connected to the scraper rotating shaft, the scraper rotating shaft drives the main scrapers to rotate in one direction, the disc-shaped powder spreading table is further provided with at least one powder spreading port, and powder is sent out from the powder spreading port through the one-way rotation of the main scrapers. The powder spreading efficiency of the 3D printing powder spreading system is improved, meanwhile, the printing risk is reduced due to the fact that the scraper rotating shaft rotates in a one-way mode, the main scraper can continue to be used for spreading the powder on the next layer after the powder scraped by the previous main scraper, continuous powder spreading is achieved, and the powder utilization rate is improved.
Further, still include vice scraper and vice scraper drive unit, vice scraper drive unit drives vice scraper along the radial reciprocating motion of powder platform is spread to the disc will the powder of the direction of rotation's of main scraper front side is strickleed off, has further improved the shop's powder homogeneity of 3D printing shop powder system.
The invention further provides a 3D printing device, and the 3D printing powder spreading system is adopted, so that the powder spreading efficiency and the powder utilization rate of the 3D printing powder spreading system are improved, and the printing risk is reduced.
The invention also provides a 3D printing powder laying method, the scraper rotating shaft drives the main scrapers to rotate in one direction to lay powder on one layer, so that the powder laying efficiency of the 3D printing powder laying system is improved, and meanwhile, the printing risk is reduced due to the unidirectional rotation of the scraper rotating shaft, so that the main scrapers can continue to use the powder scraped by the previous main scraper for laying powder on the next layer, the continuous powder laying is realized, and the powder utilization rate is improved.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the 3D printing and powder spreading method disclosed in the embodiment, since the 3D printing device adopted by the method corresponds to the 3D printing device disclosed in the embodiment, the description of the 3D printing device involved therein is relatively simple, and the relevant points can be referred to the description of the 3D printing device part.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (15)
1. A3D printing powder spreading system is characterized by comprising a disc-shaped powder spreading platform, a first cylindrical powder groove wall, a scraper rotating shaft, a plurality of main scrapers, auxiliary scrapers and auxiliary scraper transmission units, wherein the lower edge of the first cylindrical powder groove wall is connected to the upper surface of the disc-shaped powder spreading platform in a sealing mode;
a through hole is formed in the center of the disc-shaped powder spreading table, the scraper rotating shafts penetrate through the through hole, one ends of the main scrapers are fixedly connected to the scraper rotating shafts, and the scraper rotating shafts drive the main scrapers to rotate in a single direction;
the disc-shaped powder laying platform is also provided with at least one powder laying port, and powder is sent out from the powder laying port through the unidirectional rotation of the main scraper;
the auxiliary scraper transmission unit drives the auxiliary scraper to reciprocate along the radial direction of the disc-shaped powder laying platform, and is used for scraping off powder on the front side in the rotation direction of the main scraper.
2. The 3D printing powder spreading system according to claim 1, further comprising a substrate and a substrate lifting unit, wherein the powder spreading opening and the first cylindrical powder groove wall form a powder spreading area in a surrounding mode, and the substrate lifting unit is used for driving the substrate to move in a direction perpendicular to the upper surface of the disc-shaped powder spreading table in the powder spreading area, so that the relative distance between the upper surface of the substrate and the upper surface of the disc-shaped powder spreading table is changed.
3. The 3D printing dusting system of claim 2 wherein the dusting port is fan shaped.
4. The 3D printing dusting system of claim 3 wherein the substrate has a fan-shaped cross-sectional shape parallel to its upper surface.
5. The 3D printing and powder spreading system of claim 4, wherein a fan angle of the powder spreading port is smaller than or equal to a fan angle of the substrate.
6. The 3D printing dusting system of claim 3 wherein the substrate has a cross-sectional shape parallel to its upper surface that is circular or rectangular.
7. The 3D printing dusting system of claim 1 wherein the other end of the plurality of main scrapers engage the inner wall of the first cylindrical powder chute wall and the cutting edges of the plurality of main scrapers engage the upper surface of the disc-shaped dusting table.
8. The 3D printing dusting system of claim 1 where a plurality of the primary scrapers are evenly distributed along a circumferential direction of an outer wall of the scraper rotation shaft.
9. The 3D printing and powder spreading system according to claim 2, wherein the secondary scraper transmission unit is a push-pull rod unit which is inserted through the first cylindrical powder groove wall, or a guide rail unit or a belt transmission unit which is fixed to a side wall on the front side in the rotation direction of the main scraper.
10. The 3D printing powder spreading system according to claim 1, further comprising a powder feeding unit located at an upper portion of the first cylindrical powder groove wall, the powder feeding unit supplying powder to the disc-shaped powder spreading table according to a rotation speed of the main scraper and a powder spreading state of the 3D printing powder spreading system.
11. The 3D printing dusting system of claim 1 further comprising a second cylindrical powder chute wall having a plurality of slots matching the plurality of main scrapers, the second cylindrical powder chute wall passing through the scraper rotation shaft and being engaged with the plurality of main scrapers via the plurality of slots such that a lower edge of the second cylindrical powder chute wall engages an upper surface of the disc-shaped dusting table.
12. The 3D printing dusting system of claim 11 wherein the dusting port is located in a region between the first cylindrical powder tank wall and the second cylindrical powder tank wall.
13. A 3D printing apparatus comprising a 3D printing dusting system according to any of claims 1-12.
14. A3D printing powder spreading method is characterized by comprising a 3D printing powder spreading system, wherein the 3D printing powder spreading system comprises a disc-shaped powder spreading table, a first cylindrical powder groove wall, a scraper rotating shaft, a plurality of main scrapers, a substrate lifting unit, an auxiliary scraper and an auxiliary scraper transmission unit, and the lower edge of the first cylindrical powder groove wall is connected to the upper surface of the disc-shaped powder spreading table in a sealing mode;
a through hole is formed in the center of the disc-shaped powder spreading table, the scraper rotating shafts penetrate through the through hole, one ends of the main scrapers are fixedly connected to the scraper rotating shafts, and the scraper rotating shafts drive the main scrapers to rotate in a single direction;
the disc-shaped powder laying platform is also provided with at least one powder laying port, and powder is sent out from the powder laying port through the unidirectional rotation of the main scraper;
the powder spreading opening and the wall of the first cylindrical powder groove are enclosed to form a powder spreading area, and the substrate lifting unit is used for driving the substrate to move in the powder spreading area along a direction vertical to the upper surface of the disc-shaped powder spreading table so as to change the relative distance between the upper surface of the substrate and the upper surface of the disc-shaped powder spreading table;
the 3D printing powder laying method comprises the following steps:
s1: the substrate lifting unit drives the substrate to move until the distance between the upper surface of the substrate and the upper surface of the disc-shaped powder laying platform is within one layer of powder laying thickness;
s2: the scraper rotating shaft drives the main scrapers to rotate in a single direction to spread powder on one layer, and the auxiliary scraper transmission unit drives the auxiliary scrapers to reciprocate along the radial direction of the disc-shaped powder spreading table to scrape powder on the front side of the main scrapers in the rotating direction;
s3: after the layer of powder is spread and printed, the substrate lifting unit drives the substrate to descend by a distance of a layer of powder spreading thickness;
s4: and repeating the steps S2-S3 until all the powder layers are completely laid.
15. The 3D printing powder spreading method according to claim 14, wherein the 3D printing powder spreading system further comprises a powder feeding unit located at an upper portion of the first cylindrical powder groove wall, the powder feeding unit supplying powder to a powder spreading area on the disc-shaped powder spreading table according to a rotation speed of the main blade and a powder spreading state of the 3D printing powder spreading system.
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