CN113102769B - Composite vibration powder laying device and method for additive manufacturing - Google Patents
Composite vibration powder laying device and method for additive manufacturing Download PDFInfo
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- CN113102769B CN113102769B CN202110250686.XA CN202110250686A CN113102769B CN 113102769 B CN113102769 B CN 113102769B CN 202110250686 A CN202110250686 A CN 202110250686A CN 113102769 B CN113102769 B CN 113102769B
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- 239000000843 powder Substances 0.000 title claims abstract description 189
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 239000000654 additive Substances 0.000 title claims abstract description 33
- 230000000996 additive effect Effects 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 100
- 238000003892 spreading Methods 0.000 claims abstract description 38
- 230000009347 mechanical transmission Effects 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims 1
- 238000010410 dusting Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Road Paving Machines (AREA)
Abstract
The invention belongs to the field of additive manufacturing, and discloses a novel composite vibration powder spreading device for additive manufacturing, which mainly comprises: the powder roller is pressed to the front end, rear end clamp plate, vibrating device and mechanical transmission part. The front end powder pressing roller rotates at a certain rotating speed to roll the powder layer; the back end pressing plate moves up and down by the crank connecting rod device, and is characterized by also comprising a vibration device which makes the pressing plate vibrate in high frequency, so that the powder layer is further compacted, and the whole powder laying part is driven by the mechanical transmission part. The structure and the movement mode of the invention are simple, and the compactness among the powders is increased by using a rolling combination mode, so that the compactness of a three-dimensional formed product is improved; the structure of the pressing plate is optimized, and a cambered surface with a certain radian is designed at the contact end of the pressing plate and the powder layer, so that the powder ejection phenomenon is effectively reduced, and the service life of the pressing plate is prolonged. The whole device is simple and compact, the working procedures are simple, the whole powder paving process is finished at one time, the time can be effectively saved, and the efficiency is improved.
Description
Technical Field
The invention relates to the field of additive manufacturing of metal materials, in particular to a composite vibration powder laying device and a powder laying method for additive manufacturing.
Background
The additive manufacturing technology is commonly called as 3D printing technology, wherein, the Selective Laser Melting (SLM) technology is one of the most advanced development forms in the metal additive manufacturing technology, and the processing process mainly comprises: after the three-dimensional digifax of the part is sliced and layered and is guided into a forming device, a horizontal scraper plate uniformly spreads the accumulated metal powder on a horizontal substrate, a high-energy laser beam selectively melts the powder on the substrate according to the data information of the current slice layer, the shape of the current layer is formed, the substrate is lowered by a certain height, then the horizontal scraper plate spreads a thin layer of metal powder on the formed structure, the laser melts a powder layer according to a planned path, and the steps are repeated until the whole part is manufactured.
However, the current selective laser melting technology still faces a series of problems, such as rough forming surface, large residual stress, easy generation of cracks, holes and other defects. Experimental observation shows that the quality of the powder paving quality directly determines the forming precision and the density of the sample. In the prior art, a powder spreading part mainly adopts a scraper blade or a roller, the scraper blade type is easy to scrape traces on a powder layer in the using process, and when the particle size of powder is too large, the powder ejecting phenomenon can occur to pollute a laser lens, and the powder is easy to adhere to the scraper blade to influence the subsequent powder spreading; compared with a roller type powder pressing roller, the density of the powder layer can be greatly improved, but due to the shape of the powder pressing roller, ripples are easily formed on the surface of the powder layer, and the powder spreading quality is reduced. To this type of problem, some people design portable powder part that falls, fall the powder and spread the powder and go on simultaneously, can avoid the powder to pile up in powder pressing roller or scraper blade the place ahead, but the structure is complicated, and clearance powder and maintenance degree of difficulty are big. The better method is that a vibration source is added on the scraper blade or the roller, and the scraper blade or the powder pressing roller vibrates singly when moving, so that the powder sticking phenomenon of the powder laying part can be effectively reduced, and the defects brought by the structure can not be avoided.
Disclosure of Invention
The invention aims to design a composite vibration powder spreading device for additive manufacturing, which couples rolling technologies, effectively solves the problems in the prior art and improves the compactness of a three-dimensional formed product.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a combined type vibration powder paving device that increases, for combined type vibration powder paving device, includes two dead levers and mobile jib, mechanical transmission part and shop's powder part, and two dead levers are connected at the both ends that the powder device was spread in the combined type vibration, and two dead levers are connected respectively at mechanical transmission part both ends, and shop's powder part is connected with mechanical transmission part through the mobile jib, makes a round trip between two dead levers through mechanical transmission part, shop's powder part includes front end pressure powder roller part, rear end clamp plate part and vibrating device.
Foretell combined type vibration powder paving device of additive manufacturing, front end powder pressing roller part is including powder pressing roller, second driving motor, and second driving motor connects in the mobile jib side, and second driving motor's output shaft and powder pressing roller are connected, drive the powder pressing roller and rotate with certain rotational speed.
The rear-end pressing plate portion comprises a connecting plate, a first driving motor, a crank connecting rod device and a pressing plate, the connecting plate is connected with the main rod, the first driving motor is connected to the connecting plate, an output rod of the first driving motor is connected with the crank connecting rod device, the other end of the crank connecting rod device is connected with the pressing plate, the vibrating device is connected to the pressing plate, and the length and the width of the pressing plate are matched with the powder pressing roller.
Foretell a combined type vibration powder paving device that adds material manufacturing, crank link means includes crank, T type connecting rod and spacing groove, and T type connecting rod includes horizontal pole and montant, and it has rectangular hole to open on the horizontal pole, and the spacing groove is connected on the connecting plate, and T type connecting rod sliding connection is spacing about the T type connecting rod in the spacing groove.
Foretell combined type vibration powder paving device of vibration material increase, it has rectangular hole to open on the spacing groove, montant back connection has spacing post, spacing post can slide from top to bottom in rectangular hole, and is spacing about to T type connecting rod.
Foretell combined type vibration powder paving device of vibration material increase manufacturing, mechanical transmission part is rack and pinion meshing transmission, including gear, rack, step motor, slider and guide rail, and step motor connects on the slider, and step motor's output shaft and gear connection, gear and rack meshing, step motor drive gear drive powder paving part move along the guide rail.
In the composite vibration powder spreading device for additive manufacturing, one side of the pressing plate, which is close to the powder pressing roller, is recessed inwards and is adapted to the outline of the powder pressing roller.
According to the composite vibration powder spreading device for additive manufacturing, the radian of the contact front end of the rear end pressing plate and the powder layer is certain, the buffering effect is achieved, and the powder ejection phenomenon can be effectively reduced.
In the composite vibration powder spreading device for additive manufacturing, the vibration device is located above the rear end pressing plate and is an ultrasonic vibrator capable of generating vibration in three-dimensional directions so as to vibrate and compact the powder layer.
In the composite vibration powder spreading device for additive manufacturing, the connecting plate is fixed on the main rod through the bolt, the first driving motor drives the crank to rotate, and the T-shaped connecting rod is further utilized to drive the pressing plate to move up and down.
In the composite vibration powder spreading device for additive manufacturing, the semicircular stabilizing plate is semicircular.
The composite vibration powder spreading device for additive manufacturing further comprises a single chip microcomputer and a sensor device.
The composite vibration powder spreading device for additive manufacturing comprises an infrared sensor and an infrared source.
Foretell combined type vibration powder paving device of vibration material increase, the crank connecting rod device still includes semicircle shape firm board, and firm board is connected between mobile jib and spacing groove, disperses the atress in spacing groove.
The powder device is spread in combined type vibration of vibration material increase manufacturing, front end powder pressing roller part still includes the bearing, and the powder pressing roller passes through the bearing and is connected with second driving motor.
A powder paving method of a combined type vibration powder paving device for additive manufacturing comprises the following steps:
(1) firstly, a stepping motor drives a gear to rotate and move along a rack to drive the whole powder paving part to move to a powder paving platform, and then a powder feeding device piles metal powder on the outer side of a workbench close to the powder paving platform and the front end of the powder paving part in advance;
(2) when the powder feeding of the powder feeding device is finished, the singlechip controls a second driving motor at the front end powder pressing roller and a first driving motor at the crank to be started simultaneously to drive the powder pressing roller and the pressing plate to start to move, and the vibrating device is started simultaneously to ensure that the pressing plate moves up and down and simultaneously vibrates in a three-dimensional direction;
(3) the periphery of the powder spreading platform is connected with an infrared sensor and an infrared source respectively, when the infrared sensor detects that the pressing plate contacts with the workbench, the gear-rotating stepping motor is controlled to stop working, meanwhile, the first driving motor and the second driving motor of the powder spreading part and the vibrating device are controlled to stop working, and single-layer powder spreading is completed;
(4) and (4) repeating the steps (1) to (3) until the printing of the three-dimensional object is completed.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
1. according to the invention, the powder pressing roller and the pressing plate are combined, and the powder rolled by the powder pressing roller is further tamped after the pressing plate is vibrated and pressurized, so that the compactness of the powder is increased, multiple powder spreading is not needed, the time is effectively saved, and the efficiency of a workpiece is improved.
2. The invention upgrades the scraper, designs the pressure plate with certain width, enlarges the action area of the pressure plate and the powder layer, compacts the powder layer, and designs the cambered surface with certain radian at the contact part of the rear end pressure plate and the powder layer, thereby effectively reducing the powder ejection phenomenon and prolonging the service life of the pressure plate.
3. The pressing plate and the powder pressing roller are simple to connect, the disassembly and the replacement are simple, the whole replacement is not needed, and the economic cost is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of a composite additive manufacturing vibration powder spreading device according to the present invention;
FIG. 2 is a partial schematic view of the mechanical transmission part of the present invention;
FIG. 3 is a partial schematic view of the crank and T-shaped connecting rod of the present invention.
In the figure 1, a workbench; 2. a powder laying platform; 3. fixing the rod; 4. a rack; 5. a stepping motor; 6. a slider; 7. a main rod; 8. a first drive motor; 9. a crank; 10. a T-shaped connecting rod; 11. a connecting plate; 12. an ultrasonic vibrator; 13. pressing a plate; 14. pressing a powder roller; 15. a bearing; 16. a second drive motor; 17. a gear; 18. a limiting groove; 19. a stabilizing plate; 20. a limiting column.
Detailed Description
Example 1
The utility model provides a combined type vibration powder paving device that increases, for combined type vibration powder paving device, includes two dead levers 3 and mobile jib 7, mechanical transmission part and shop's powder part, and two dead levers 3 are connected at the both ends that the powder device was spread in the combined type vibration, and the top of two dead levers 3 is connected respectively at mechanical transmission part both ends, and shop's powder part is connected with mechanical transmission part through mobile jib 7, makes a round trip between two dead levers 3 through mechanical transmission part, shop's powder part includes front end pressure powder roller part, rear end clamp plate part and vibrating device.
Example 2
Based on embodiment 1, embodiment 2 lists a number of further features, and embodiment 1 can be combined with one or more of them to form a number of new and different solutions.
Further, in the composite vibration powder spreading device for additive manufacturing, the front end powder pressing roller part comprises the powder pressing roller 14 and the second driving motor 16, the second driving motor 16 is connected to the side surface of the main rod 7, and an output shaft of the second driving motor 16 is connected with the powder pressing roller 14 to drive the powder pressing roller 14 to rotate at a certain rotating speed.
Further, the rear-end pressing plate portion comprises a connecting plate 11, a first driving motor 8, a crank-link device and a pressing plate 13, the connecting plate 11 is connected with the main rod 7, the first driving motor 8 is connected to the connecting plate 11, an output rod of the first driving motor 8 is connected to the crank-link device, the other end of the crank-link device is connected to the pressing plate 13, the vibrating device is connected to the pressing plate 13, and the length and width of the pressing plate are matched with those of the powder pressing roller.
Further, the combined type vibration powder spreading device for additive manufacturing comprises a crank 9, a T-shaped connecting rod 10 and a limiting groove 18, wherein the T-shaped connecting rod 10 comprises a cross rod and a vertical rod, the cross rod is provided with a long hole, the limiting groove 18 is connected to a connecting plate 11, and the T-shaped connecting rod 10 is connected in the limiting groove 18 in a sliding mode and limits the T-shaped connecting rod 10 in the left-right direction.
Further, above-mentioned combined type vibration powder paving device of vibration material increase, it has rectangular hole to open on the spacing groove 18, montant back connection has spacing post 20, spacing post 20 can slide from top to bottom in rectangular downthehole, and is spacing about to T type connecting rod 10.
Further, in the composite vibration powder spreading device for additive manufacturing, the crank-link device further comprises a semicircular stabilizing plate 19, and the stabilizing plate 19 is connected between the main rod 7 and the limiting groove 18 to disperse the stress of the limiting groove 18.
Further, foretell combined type vibration powder paving device of vibration material increase, mechanical transmission part is rack and pinion meshing transmission, including gear 17, rack 4, step motor 5, slider 6 and guide rail, and step motor 5 connects on the slider, and step motor 5's output shaft is connected with gear 17, and step motor 5 drive gear 17 rotates, and gear 17 meshes with rack 4 mutually, and step motor 5 drive gear 17 drives the powder paving part and removes along the guide rail.
Further, in the composite vibration powder spreading device for additive manufacturing, the front end powder pressing roller part further includes a bearing 15, and the powder pressing roller 14 is connected with the second driving motor 16 through the bearing 15.
Further, in the composite vibration powder spreading device for additive manufacturing, the vibration device is an ultrasonic vibrator 12.
Further, in the composite vibration powder spreading device for additive manufacturing, one side of the pressing plate 13 close to the powder pressing roller 14 is recessed inwards to adapt to the outline of the powder pressing roller 14.
Furthermore, in the composite vibration powder spreading device for additive manufacturing, the front end of the rear end pressing plate 13, which is in contact with the powder layer, has a certain radian, so that the buffering effect is achieved, and the powder ejection phenomenon can be effectively reduced.
Further, in the composite additive manufacturing vibration powder laying device, the vibration device is located above the rear end pressing plate 13, and the ultrasonic vibrator 12 is preferably an ultrasonic vibrator capable of generating vibration in three-dimensional directions to perform vibration compaction on the powder layer.
Further, in the composite vibration powder spreading device for additive manufacturing, the connecting plate 11 is fixed on the main rod 7 through a bolt, the crank 9 is driven to rotate by the first driving motor 8, and the pressing plate 13 is further driven to move up and down by the T-shaped connecting rod 10.
Further, according to the combined type vibration powder spreading device for additive manufacturing, the semicircular stabilizing plate 19 is semicircular, so that the transition performance is good, the appearance is attractive, and materials are saved.
Further, the composite vibration powder spreading device for additive manufacturing further comprises a single chip microcomputer and a sensor device.
Further, the composite additive manufacturing vibration powder laying device comprises an infrared sensor and an infrared source.
Example 3
The invention is specifically explained by embodiments with reference to a specific powder paving method, and the device mainly comprises a workbench 1, a powder paving platform 2, two fixing rods 3, a main rod 7, a mechanical transmission part and a powder paving part. The mechanical transmission part and the powder spreading part are both positioned above the workbench 1, the powder spreading platform 2 is connected in the middle of the workbench 1, the mechanical transmission part is fixed with the workbench 1 through a fixing rod 3, the mechanical transmission part mainly comprises a rack 4, a gear 17, a stepping motor 5, a sliding block 6 and a guide rail, and the stepping motor 5 is adopted to drive the gear 17 to rotate, so that the sliding block 6 is driven to realize the linear motion of the device on the guide rail of the rack 4; the powder laying part is divided into a front-end powder pressing roller part and a rear-end pressing plate part, the front-end powder pressing roller part comprises a powder pressing roller 14, a bearing 15 and a second driving motor 16, the second driving motor 16 is connected to the side face of the main rod 7, and an output shaft of the second driving motor 16 is connected with the powder pressing roller 14 to drive the powder pressing roller 14 to rotate at a certain rotating speed; the rear-end pressing plate part comprises a first driving motor 8, a crank 9, a T-shaped connecting rod 10, a connecting plate 11, an ultrasonic vibrator 12 and a pressing plate 13, the first driving motor 8 drives the crank 9 to rotate at a certain rotating speed so as to drive the T-shaped connecting rod 10 to move up and down, the pressing plate 13 is further driven to compact the powder layer, the ultrasonic vibrator 12 is fixed on the pressing plate 13 and drives the pressing plate 13 to vibrate, the rolling technology is coupled, and the compactness of a three-dimensional formed product is improved.
The front end powder pressing roller is mainly used for primarily rolling the falling powder; the rear end pressing plate is designed to have a certain width, an action area with the powder layer is enlarged, the powder layer is compacted, a certain radian is formed at the front end of the rear end pressing plate, which is in contact with the powder layer, and the rear end pressing plate has a caching function and is used for reducing the powder ejection phenomenon; the vibrating device is connected onto the rear-end pressing plate, and the ultrasonic vibrator is preferably an ultrasonic vibrator capable of generating vibration in the three-dimensional direction so as to vibrate and compact the powder layer and effectively reduce the powder sticking phenomenon on the pressing plate; the connecting plate is fixed on the main rod through a bolt, the first driving motor 8 drives the crank 9 to rotate, and the T-shaped connecting rod 10 is further utilized to drive the pressing plate 13 to move up and down; two fixed rods 3 are connected to two sides of the workbench to fix the mechanical transmission part on the workbench 1, a rack 4 is connected with the guide rail and drives the sliding block to move on the guide rail by adopting a stepping motor.
A powder paving method of a combined type vibration powder paving device for additive manufacturing comprises the following steps:
(1) firstly, a stepping motor 5 drives a gear 17 to rotate and move along a rack 4 to drive the whole powder laying part to move to a powder laying platform 2, and then a powder feeding device piles metal powder on the outer side of a workbench 1 close to the powder laying platform 2 and the front end of the powder laying part in advance;
(2) when the powder feeding of the powder feeding device is finished, the singlechip controls the second driving motor 16 at the front end powder pressing roller 14 and the first driving motor 8 at the crank 9 to be started simultaneously, so as to drive the powder pressing roller 14 and the pressing plate 13 to start to move, and the vibration device 12 is also started simultaneously, so that the pressing plate 13 is ensured to move up and down and simultaneously vibrate in a three-dimensional direction;
(3) the periphery of the powder spreading platform and the bottom of the pressing plate are respectively connected with an infrared sensor and an infrared source, when the infrared sensor detects that the pressing plate 13 is in contact with the workbench 1, the gear-rotating stepping motor 5 is controlled to stop working, meanwhile, the first driving motor 8 and the second driving motor 16 of the powder spreading part and the vibrating device 12 are controlled to stop working, and single-layer powder spreading is completed;
(4) and (4) repeating the steps (1) to (3) until the printing of the three-dimensional object is completed.
Claims (2)
1. The utility model provides a combined type vibration of vibration powder paving device which characterized in that: the composite vibration powder spreading device comprises two fixing rods, a main rod, a mechanical transmission part and a powder spreading part, wherein two ends of the mechanical transmission part are respectively connected with the two fixing rods, the powder spreading part is connected with the mechanical transmission part through the main rod, the powder spreading part moves back and forth between the two fixing rods through the mechanical transmission part, and the powder spreading part comprises a front end powder pressing roller part, a rear end pressing plate part and a vibration device;
the front end powder pressing roller part comprises a powder pressing roller and a second driving motor, the second driving motor is connected to the side face of the main rod, and an output shaft of the second driving motor is connected with the powder pressing roller to drive the powder pressing roller to rotate at a certain rotating speed;
the rear end pressing plate part comprises a connecting plate, a first driving motor, a crank connecting rod device and a pressing plate, the connecting plate is connected with the main rod, the first driving motor is connected onto the connecting plate, an output rod of the first driving motor is connected with the crank connecting rod device, the other end of the crank connecting rod device is connected with the pressing plate, the vibrating device is connected onto the pressing plate, and the length and width of the pressing plate are matched with those of the powder pressing roller;
the T-shaped connecting rod is connected to the connecting plate in a sliding mode and limits the T-shaped connecting rod leftwards and rightwards;
the limiting groove is provided with a long hole, the back of the vertical rod is connected with a limiting column, and the limiting column can slide up and down in the long hole of the limiting groove to limit the T-shaped connecting rod up and down;
the mechanical transmission part is in gear-rack meshing transmission and comprises a gear, a rack, a stepping motor, a sliding block and a guide rail, the stepping motor is connected to the sliding block, an output shaft of the stepping motor is connected with the gear, the gear is meshed with the rack, and the stepping motor drives the gear to drive the powder spreading part to move along the guide rail;
the front end of the pressing plate, which is in contact with the powder layer, has a certain radian, has a caching effect, and effectively reduces the powder ejection phenomenon; one side of the pressing plate, which is close to the powder pressing roller, is inwards concave and is adaptive to the outline of the powder pressing roller.
2. The composite additive manufacturing vibratory dusting device of claim 1, wherein: the vibration device is positioned above the pressing plate and is an ultrasonic vibrator capable of generating vibration in the three-dimensional direction so as to vibrate and compact the powder layer.
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CN104043830B (en) * | 2014-06-30 | 2016-02-24 | 湖南华曙高科技有限责任公司 | Increase material manufacturing equipment and compound rolling power spreading device, method |
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