CN112264617B - Powder feeding and spreading device for additive manufacturing equipment and collision powder discharging method thereof - Google Patents
Powder feeding and spreading device for additive manufacturing equipment and collision powder discharging method thereof Download PDFInfo
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- CN112264617B CN112264617B CN202010891188.9A CN202010891188A CN112264617B CN 112264617 B CN112264617 B CN 112264617B CN 202010891188 A CN202010891188 A CN 202010891188A CN 112264617 B CN112264617 B CN 112264617B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
A powder feeding and spreading device for additive manufacturing equipment and a powder collision discharging method thereof are disclosed, wherein the powder feeding and spreading device comprises a powder storage groove, a mounting seat, an inserting plate and a scraper mechanism, the mounting seat comprises a first panel, a second panel and a first through hole, the inserting plate is slidably arranged in the first through hole, the first panel is provided with a second through hole communicated with a powder outlet of the powder storage groove, the second panel is provided with two third through holes, four corners of the inserting plate are respectively connected with collision rods through transmission arms, so that when the collision rods collide with any inner wall of a working cavity, the powder feeding and spreading device moves at a first preset speed, and meanwhile, the relative movement of the mounting seat and the inserting plate enables powder in the powder storage groove to fall into a fourth through hole far away from the collision inner wall through the second through hole and fall into one side of the scraper mechanism far away from the collision inner wall through the third through hole; and when the collision rod does not collide with any inner wall of the working cavity, the powder conveying and spreading device moves at a second preset speed to spread the powder. The invention ensures the working efficiency and better powder laying quality.
Description
Technical Field
The invention relates to the technical field of three-dimensional object manufacturing, in particular to a powder conveying and spreading device for additive manufacturing equipment and a collision powder discharging method of the powder conveying and spreading device.
Background
The laser sintering process as one of additive manufacturing technologies comprises the following basic processes: the equipment adds or carries the powder into and supplies the powder case before printing or in-process, supply the powder in the powder case to send a certain amount of powder to table surface through certain powder feeding device, powder on the table surface is evenly spread on the sintering plane through scraper or shop's powder roller again, the powder of work piece cross-section profile part on the sintering plane is directly sintered or is preheated the back and is sintered through the laser by the mirror control of shaking, after one deck cross-section sintering is accomplished, the workstation descends the thickness of a layer, carry out the powder of above-mentioned again, shop's powder, laser sintering process, through this kind of layer sintering printing back, the work piece is just made out, the additive manufacturing of whole work piece has been accomplished, 3D printing process.
In the prior art, the powder feeding device is generally divided into an upper powder feeding part and a lower powder feeding part, the upper powder feeding part comprises a powder feeding hopper, a powder feeding box body and a powder paving device arranged inside the box body, and the powder paving device is used for paving powder to a front limit position and a rear limit position at a single preset moving speed and colliding with an ejector rod to enable the powder in a groove to fall down so as to finish the powder feeding. Although this powder feeding mode has compact structure, can effectively realize two-way shop's powder, the shortcoming is when the mobility of the powder of use is relatively poor, can lead to down the powder process intermittent and intermittent for the powder volume of falling to the scraper shop powder side about inconsistent or the powder volume of falling is not enough, can lead to printing face local lack of powder when shop's powder, and then influences the technical problem of work piece scanning shaping and printing efficiency.
Disclosure of Invention
Based on the technical scheme, the invention provides a powder conveying and spreading device for additive manufacturing equipment and a collision powder discharging method thereof, and aims to solve the technical problem that powder is lack when the flowability of used powder is poor in the powder conveying and spreading method in the prior art.
In order to achieve the above object, the present invention provides a powder feeding and spreading device for an additive manufacturing apparatus, comprising: the powder storage device comprises a powder storage tank, a mounting seat arranged below the powder storage tank, an inserting plate with two fourth through holes and a scraper mechanism arranged below the mounting seat, wherein the mounting seat comprises a first panel, a second panel and a first through hole positioned between the first panel and the second panel, the inserting plate is slidably arranged in the first through hole, the first panel is provided with a second through hole communicated with a powder outlet of the powder storage tank, the second panel is provided with two third through holes staggered with the second through holes, four corners of the inserting plate are respectively connected with collision rods through transmission arms, so that when the collision rods collide with any inner wall of a working cavity, the powder conveying and spreading device moves at a first preset speed, and meanwhile, the relative motion of the mounting seat and the inserting plate enables powder in the powder storage tank to fall into the fourth through hole far away from the collision inner wall through the second through hole, and the powder falling into the fourth through hole falls into one side far away from the collision inner wall of the scraper mechanism through the third through hole; and when the collision rod does not collide with any inner wall of the working cavity, the powder conveying and spreading device moves at a second preset speed to spread the powder.
As a further preferable aspect of the present invention, the first preset speed is lower than the second preset speed, and the first preset speed may be adjusted according to the flowability of the powder in the powder storage tank.
As a further preferable scheme of the present invention, two sides of the scraper mechanism are respectively provided with a powder falling channel communicated with the third through hole.
As a further preferable scheme of the present invention, the mounting seat is formed by splicing a first panel and a second panel, the first panel is U-shaped, and the second panel is flat; or the first panel is L-shaped, and the second panel is L-shaped.
As a further preferable scheme of the invention, the inserting plate is respectively in sliding fit with the first panel and the second panel, and the top surface of the middle part of the inserting plate, which is parallel to the upper surface and the lower surface of the first panel or the second panel, is 0.1-5mm lower than the top surfaces of the two sides.
As a further preferable scheme of the invention, at least two guide mechanisms are respectively arranged on two side edges of the inserting plate parallel to the moving direction of the inserting plate.
As a further preferable embodiment of the present invention, each corner of the insert plate has two protruding columns spaced apart by a predetermined distance, the insert plate is connected to one end of the driving arm by respectively providing bolts on the two protruding columns, and the other end of the driving arm is connected to the collision bar.
In a further preferred embodiment of the present invention, an elastic member is provided in the impact beam.
The invention also provides a collision powder discharging method of the powder conveying and spreading device for the additive manufacturing equipment, which comprises the following steps:
when powder is flatly paved on a current layer of a working area, scanning of a scanning section of the current layer is started, meanwhile, the powder conveying and paving device moves at a second preset speed, when the powder conveying and paving device moves to any collision starting position, the powder conveying and paving device continues to move at a first preset speed, and collision of a collision rod and any inner wall of the working cavity causes relative movement between the mounting seat and the inserting plate, so that the powder in the powder storage groove falls into a fourth through hole far away from the collision inner wall through the second through hole, and the powder falling into the fourth through hole falls into one side, far away from the collision inner wall, of the scraper mechanism through the third through hole;
when the scanning section of the current layer is scanned, the powder conveying and spreading device continuously moves at a second preset speed and spreads powder to the working area to realize powder spreading of the next layer;
and repeating the steps until the scanning of the scanning cross sections of all the layers is finished.
As a further preferable mode of the present invention, the collision start position is a position where the collision bar starts to collide with any one of the inner walls of the working chamber.
The powder conveying and spreading device for the additive manufacturing equipment has the following beneficial effects by adopting the technical scheme:
1. the powder feeding device meets the requirement of the powder feeding and spreading function, meanwhile, the powder feeding is realized through the movement of the inserting plate, meanwhile, the moving power of the inserting plate comes from the translational motion during the powder spreading, the powder feeding action can be executed in a self unpowered mode, and meanwhile, the powder feeding amount can be adjusted through the size of the fourth through hole of the inserting plate; moreover, the complexity of a powder feeding structure is reduced to the greatest extent, the use of power equipment, bearing sealing elements and the like is reduced, the cost is reduced, and the safety and the reliability in use are improved;
2. by adopting different moving speeds in the collision stage and the non-collision stage, and the moving speed in the non-collision stage is higher than that in the collision stage, the powder spreading efficiency of the whole powder spreading stroke is basically ensured, the smoothness of powder falling and sufficient powder falling amount in collision can be ensured, and the phenomenon of powder shortage or powder lack is avoided, so that the stability and the reliability of the work are ensured;
3. the second through hole and the third through hole are arranged in a staggered mode, the powder in the powder storage groove falls to the fourth through hole firstly through the movement of the inserting plate, then the powder in the fourth through hole falls to one side of the scraper mechanism, and the powder conveying amount of each layer is borne through the fourth through hole of the inserting plate (for example, the powder in the fourth through hole cannot be filled continuously after being filled up), so that compared with the traditional valve type powder discharging, the powder conveying and spreading structure enables the powder conveying amount to be more accurate.
The collision powder discharging method of the powder conveying and spreading device for the additive manufacturing equipment has the following beneficial effects by adopting the technical scheme:
1. by adopting different moving speeds in the collision stage and the non-collision stage, and the moving speed in the non-collision stage is higher than that in the collision stage, the powder spreading efficiency of the whole powder spreading stroke is basically ensured, the smoothness of powder falling and sufficient powder falling amount in the collision can be ensured, the phenomenon of powder shortage or powder lack is avoided, and the stability and the reliability of the work are ensured.
2. The moving speed during collision can be adjusted according to the powder flowability, so that for the metal powder with larger powder flowability difference, the method adapts to the gravity falling flowability of the powder by setting different moving speeds (namely different impact speeds), thereby ensuring that the falling powder in the inserting plate is filled, namely avoiding the powder shortage phenomenon.
3. When the powder is paved on the current layer of the working area (namely, the powder crosses the working area without reaching the boundary of the working area), the scanning section of the current layer is immediately scanned, so that the scanning waiting time is saved, and because the scanning time of each layer is far longer than the moving time of the powder paving device in a collision stage and a non-collision stage, the collision and non-collision two stages adopted by the invention adopt different moving speeds without influencing the working efficiency of equipment, namely, the working efficiency is ensured, and the good powder paving quality is also ensured.
Drawings
FIG. 1 is a cross-sectional view of a powder feeding and spreading device for an additive manufacturing apparatus according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a second embodiment of a powder feeding and spreading device for an additive manufacturing apparatus according to the present invention;
FIG. 3 is a schematic view of a double slot insert plate;
FIG. 4 is a schematic view of the structure of the crash bar;
fig. 5 is a schematic layout of an additive manufacturing apparatus.
Reference numbers in the figures: 1. a powder storage tank; 2. a first panel; 21. a second through hole; 3. inserting plates; 31. a fourth via hole; 32. a convex column; 4. a second panel; 41. a third through hole; 5. a collision bar; 6. a powder falling channel; 7. a dust-proof cover plate; 8. a scraper mechanism; 9. a spring; A. limiting position after powder spreading; B. limiting position before powder spreading; C. a molding cylinder; D. a powder spreading device; E. a front impact start position; F. rear collision start position.
Detailed Description
In order that the invention may be more fully understood, a more particular description of the invention will now be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and 2, the present invention provides a powder feeding and spreading device for an additive manufacturing apparatus, including: the powder storage device comprises a powder storage tank 1, a mounting seat arranged below the powder storage tank 1, an inserting plate 3 with two fourth through holes 31 and a scraper mechanism 8 arranged below the mounting seat, wherein the mounting seat comprises a first panel 2, a second panel 4 and a first through hole positioned between the first panel 2 and the second panel 4, the inserting plate 3 is slidably arranged in the first through hole, the first panel 2 is provided with a second through hole 21 communicated with a powder outlet of the powder storage tank 1, the second panel 4 is provided with two third through holes 41 staggered with the second through hole 21, four corners of the inserting plate 3 are respectively connected with collision rods 5 through transmission arms, so that when the collision rods 5 collide with any inner wall of a working cavity, a powder conveying and spreading device D moves at a first preset speed, and meanwhile, the mounting seat and the inserting plate 3 make powder in the powder storage tank 1 fall into the fourth through hole 31 far away from the collision inner wall through the second through hole 21, and the powder falling into one side of the scraper mechanism 8 far away from the inner wall; and when the collision rod 5 does not collide with any inner wall of the working cavity, the powder conveying and spreading device D moves at a second preset speed to spread powder. The first preset speed is smaller than the second preset speed, and the first preset speed can be adjusted according to the flowability of the powder in the powder storage tank 1.
As a further preferable scheme of the present invention, two sides of the scraper mechanism 8 are respectively provided with a powder falling channel 6 communicated with the third through hole 41; send powder paving device D still including the dustproof apron 7 that is used for shroud scraper mechanism 8 and powder falling channel 6, powder falling channel 6 and dustproof apron 7 can be used to reduce the production and the side long-pending powder of raise dust when the powder falling height is higher.
Top-down is equipped with high material level switch and low material level switch in proper order on the powder storage tank 1 to when the powder that supplies the powder case to carry by the outside when storing in the powder storage tank 1 is less than low material level switch, send information to control system, supply the powder case to carry the powder to the powder storage tank 1 with the control outside, and when the powder reaches high material level switch in the powder storage tank 1, send information to control system, so that the outside supplies the powder case to stop to the powder storage tank 1 transport powder, in order to realize the automatic of powder and carry. The powder stored in the powder storage tank 1 can ensure the powder supply requirement of several to dozens of layers of powder of the workpiece to be printed.
Preferably, in order to facilitate the assembly of the device and reduce the manufacturing cost of the device, the mounting seat is formed by splicing a first panel 2 and a second panel 4, the first panel 2 is U-shaped, and the second panel 4 is flat; or the first panel 2 is L-shaped and the second panel 4 is L-shaped. The inserting plate 3 is in sliding fit with the first panel 2 and the second panel 4 respectively. Further preferably, in order to ensure that the insert plate 3 slides more smoothly as much as possible on the premise that the insert plate 3 slides stably with the first panel 2 and the second panel 4, a middle top surface of the insert plate 3 parallel to the upper and lower surfaces of the first panel 2 or the second panel 4 is slightly lower than top surfaces of the two sides, and a specific value can be obtained according to experiments, for example, can be lower than 0.1-5mm.
As a further preferable scheme of the present invention, at least two guiding mechanisms are respectively arranged on two side edges of the inserting plate 3 parallel to the moving direction of the inserting plate 3, and are used for guiding the sliding of the inserting plate 3.
Preferably, as shown in fig. 3, each corner of the insert plate 3 has two protruding columns 32 spaced apart by a predetermined distance, and the insert plate 3 is connected to one end of a driving arm by respectively providing bolts on the two protruding columns 32, and the other end of the driving arm is connected to the collision bar 5. The preset distance can be specifically set by a designer, so that the powder brought out by the inserting plate 3 in the moving process flows down through the gap between the two convex columns 32, and powder accumulation is avoided.
In order to avoid too much vibration caused by the collision when the collision bar 5 collides with any inner wall of the working chamber and reduce the impact force of the movement of the insert plate 3, it is preferable that, as shown in fig. 4, the collision bar 5 is provided with an elastic member therein, which may be a spring 9. The length of the collision rod 5 can be specifically set according to needs, for example, the length of the collision rod 5 can be specifically set according to the two-pole position of the powder feeding and spreading device D and the size of the internal space of the equipment, so that the powder feeding and spreading device D can begin to collide before the two-pole position.
It should be noted that the second through hole 21, the third through hole 41 and the fourth through hole 31 are all elongated shapes, and may be completely open holes or incompletely open holes, that is, a plurality of through holes are formed, and adjacent through holes are connected by a reinforcing rib.
The invention also provides a collision powder discharging method of the powder conveying and spreading device for the additive manufacturing equipment, which comprises the following steps:
when powder is flatly laid on the current layer of the working area, scanning is carried out on the scanning section of the current layer, meanwhile, the powder conveying and spreading device D moves at a second preset speed, when the powder conveying and spreading device D moves to any collision starting position, the powder conveying and spreading device D continues to move at a first preset speed, and the collision of the collision rod 5 and any inner wall of the working cavity causes the installation seat and the inserting plate 3 to move relatively, so that the powder in the powder storage tank 1 falls into a fourth through hole 31 far away from the collision inner wall through the second through hole 21, and the powder falling into the fourth through hole 31 falls into one side, far away from the collision inner wall, of the scraper mechanism 8 through the third through hole 41;
when the scanning section of the current layer is scanned, the powder conveying and spreading device D continuously moves at a second preset speed and spreads powder to the working area to realize powder spreading of the next layer;
and repeating the steps until the scanning of the scanning cross sections of all the layers is finished.
It should be noted that in this method, the initial state of the powder feeding and spreading device D may be that a layer of powder has fallen by colliding with one side of the scraper mechanism 8 close to the powder spreading starting position, and of course, if the initial state of the powder feeding and spreading device D is that no powder exists on either side of the scraper mechanism 8, the powder feeding and spreading device D may be moved and collided with an inner wall of the working chamber, so that a layer of powder falls by colliding with one side of the scraper mechanism 8 close to the powder spreading starting position. In addition, the collision type powder conveying and spreading device D of the present invention can move back and forth in the working area under the driving of the driving mechanism to realize the powder conveying and spreading work, and since the specific way of driving the collision type powder conveying and spreading device D by the driving mechanism belongs to the prior art in the field, the detailed description thereof is omitted in the present invention. Specifically, the collision start position is a position where the collision bar 5 starts colliding with any one of the inner walls of the working chamber.
In order to make those skilled in the art better understand and realize the technical solution of the present invention, the technical solution of the present invention is described in detail below in the form of an embodiment with reference to fig. 5.
1) And the powder conveying and spreading device D is positioned at the rear limit position A of the spread powder, when the powder conveying and spreading device D starts to spread powder, the working platform of the forming cylinder C descends by one layer thickness, and the powder conveying and spreading device D moves from the rear limit position to the front limit position at the speed of 80 mm/s to spread powder. When the powder feeding and spreading device D moves to a front collision starting position E (that is, the collision rod 5 starts to collide with an inner wall of the working chamber), the powder spreading reaches, the laser starts to sinter and print the workpiece, and the moving speed of the powder feeding and spreading device D becomes 15 mm/s, at this time, under the movement of the inserting plate 3, the inserting plate 3 and the mounting seat perform relative movement, the powder in the powder storage tank 1 falls into the fourth through hole 31 through the second through hole 21, and the powder falling into the fourth through hole 31 or the through hole falls into the rear side of the scraper mechanism 8 through the third through hole 41 and the powder falling channel 6 (as shown in fig. 1) so as to complete the powder feeding amount of the next layer.
2) The powder conveying and spreading device D is located at a front limit position B of powder spreading, when the powder conveying and spreading device D starts to spread powder, the working platform of the forming cylinder C descends by one layer thickness, and the powder conveying and spreading device D moves from the front limit position to a rear limit position according to a preset powder spreading speed to spread powder. When the powder feeding and spreading device D moves to the rear collision starting position F (i.e. the collision rod 5 starts to collide with the other inner wall of the working chamber), the powder spreading reaches, the laser starts to sinter and print the workpiece, and the moving speed of the powder feeding and spreading device D becomes 15 mm/s, at this time, under the movement of the inserting plate 3, the inserting plate 3 and the mounting seat perform relative movement, the powder in the powder storage tank 1 falls into the fourth through hole 31 or the through hole through the second through hole 21, and the powder falling into the fourth through hole 31 or the through hole falls into the front side of the scraper mechanism 8 through the third through hole 41 and the powder falling channel 6 (as shown in fig. 2) so as to complete the powder feeding amount of the next layer.
3) The powder feeding and spreading device D is located at the limit position A after powder spreading, and when powder spreading is started, the powder discharging action of 1) 2) is repeated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A send shop's powder device for additive manufacturing equipment, characterized by, includes: the powder storage device comprises a powder storage tank, a mounting seat arranged below the powder storage tank, an inserting plate with two fourth through holes and a scraper mechanism arranged below the mounting seat, wherein the mounting seat comprises a first panel, a second panel and a first through hole positioned between the first panel and the second panel, the inserting plate is slidably arranged in the first through hole, the first panel is provided with a second through hole communicated with a powder outlet of the powder storage tank, the second panel is provided with two third through holes staggered with the second through holes, four corners of the inserting plate are respectively connected with collision rods through transmission arms, so that when the collision rods collide with any inner wall of a working cavity, the powder conveying and spreading device moves at a first preset speed, and meanwhile, the relative motion of the mounting seat and the inserting plate enables powder in the powder storage tank to fall into the fourth through hole far away from the collision inner wall through the second through hole, and the powder falling into the fourth through hole falls into one side far away from the collision inner wall of the scraper mechanism through the third through hole; when the collision rod does not collide with any inner wall of the working cavity, the powder conveying and spreading device moves at a second preset speed to spread powder; wherein, the first and the second end of the pipe are connected with each other,
the first preset speed is smaller than the second preset speed, and the first preset speed can be adjusted according to the flowability of powder in the powder storage groove.
2. The powder conveying and spreading device for the additive manufacturing equipment according to claim 1, wherein powder falling channels communicated with the third through holes are respectively formed in two sides of the scraper mechanism.
3. The powder conveying and spreading device for the additive manufacturing equipment according to claim 1, wherein the mounting seat is formed by splicing a first panel and a second panel, and the first panel is U-shaped and the second panel is flat; or the first panel is L-shaped, and the second panel is L-shaped.
4. The powder feeding and spreading device for the additive manufacturing equipment according to claim 3, wherein the inserting plate is in sliding fit with the first panel and the second panel respectively, and the top surface of the middle part of the inserting plate, which is parallel to the upper surface and the lower surface of the first panel or the second panel, is 0.1-5mm lower than the top surfaces of the two sides.
5. The powder feeding and spreading device for the additive manufacturing apparatus according to claim 1, wherein at least two guide mechanisms are respectively provided on both sides of the inserting plate parallel to the moving direction of the inserting plate.
6. The powder feeding and spreading device for an additive manufacturing apparatus as claimed in claim 1, wherein each corner of the insert plate has two bosses spaced apart by a predetermined distance, the insert plate is connected to one end of the driving arm by providing bolts to the two bosses, respectively, and the other end of the driving arm is connected to the collision bar.
7. The powder feeding and spreading device for the additive manufacturing apparatus according to any one of claims 1 to 6, wherein an elastic member is provided in the impact rod.
8. A collision powder discharging method of a powder conveying and spreading device for an additive manufacturing device according to any one of claims 1 to 7, characterized by comprising the following steps:
when powder is flatly paved on a current layer of a working area, scanning of a scanning section of the current layer is started, meanwhile, the powder conveying and paving device moves at a second preset speed, when the powder conveying and paving device moves to any collision starting position, the powder conveying and paving device continues to move at a first preset speed, and collision of a collision rod and any inner wall of the working cavity causes relative movement between the mounting seat and the inserting plate, so that the powder in the powder storage groove falls into a fourth through hole far away from the collision inner wall through the second through hole, and the powder falling into the fourth through hole falls into one side, far away from the collision inner wall, of the scraper mechanism through the third through hole;
when the scanning of the scanning section of the current layer is finished, the powder conveying and spreading device continuously moves at a second preset speed and spreads powder to the working area to realize powder spreading of the next layer;
and repeating the steps until the scanning of the scanning cross sections of all the layers is finished.
9. The impact powder discharging method of the powder delivery and spreading device for the additive manufacturing apparatus according to claim 8, wherein the impact starting position is a position where the impact rod starts to impact any one of the inner walls of the working chamber.
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| CN102514950B (en) * | 2011-11-16 | 2013-10-30 | 华中科技大学 | Movable-arm-type powder bed powder spreading device |
| US10328525B2 (en) * | 2015-08-25 | 2019-06-25 | General Electric Company | Coater apparatus and method for additive manufacturing |
| CN207431258U (en) * | 2017-09-20 | 2018-06-01 | 大族激光科技产业集团股份有限公司 | The two-way dust feeder of 3D printing |
| CN109605747A (en) * | 2018-12-27 | 2019-04-12 | 安徽恒利增材制造科技有限公司 | A kind of two-way powder laying device |
| CN209888156U (en) * | 2019-01-31 | 2020-01-03 | 苏州西帝摩三维打印科技有限公司 | Bidirectional quantitative powder supply device for additive manufacturing |
| CN109760313B (en) * | 2019-03-22 | 2023-08-25 | 苏州西帝摩三维打印科技有限公司 | Powder falling and spreading device for additive manufacturing equipment |
| CN111559082A (en) * | 2020-05-28 | 2020-08-21 | 湖南华曙高科技有限责任公司 | Variable speed powder laying method, apparatus and readable storage medium for three-dimensional object manufacturing |
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