CN113102776B - Residual powder circulating device and method for additive manufacturing of bottom powder feeding metal - Google Patents
Residual powder circulating device and method for additive manufacturing of bottom powder feeding metal Download PDFInfo
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- CN113102776B CN113102776B CN202110333893.1A CN202110333893A CN113102776B CN 113102776 B CN113102776 B CN 113102776B CN 202110333893 A CN202110333893 A CN 202110333893A CN 113102776 B CN113102776 B CN 113102776B
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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
- B22F3/003—Apparatus, e.g. furnaces
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
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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
The invention discloses a residual powder circulating device and a residual powder circulating method for additive manufacturing of lower powder feeding metal. The scraper device comprises a scraper device shell, a metal scraper, two side baffle clamps, a ball screw, a motor and a check clamp connector; the residual powder filtering and circulating device comprises a powder suction device, a fan, an air supply pipeline, a multi-stage filter screen, an ultrasonic vibration device, a waste powder collecting tank and a residual powder collecting tank. The powder spreading process in the powder bed additive manufacturing in the lower powder feeding mode can be optimized, meanwhile, the generated excessive metal powder is automatically filtered, when the powder in the feeding cylinder is used up, the feeding cylinder is lowered under the condition that a cabin door is not opened, and then the processed residual powder is added into the feeding cylinder through the scraper device for powder recycling.
Description
[ technical field ] A
The invention belongs to the field of powder bed type metal additive manufacturing in a lower powder feeding mode, and particularly relates to a residual powder circulating device and method for lower powder feeding metal additive manufacturing.
[ background of the invention ]
The powder bed type metal additive manufacturing is to sinter metal powder in a specific area by using high temperature of laser beams according to a design model by taking the metal powder as a printing raw material so as to prepare a product with a specific structure. Specifically, before laser beams start scanning, a powder spreading device firstly spreads metal powder in a feeding area on a substrate of a forming area, the laser beams selectively melt the metal powder on the substrate according to a filling contour line of a current layer to process the current layer, then the forming area descends by a layer thickness distance, the feeding area ascends by a certain distance, the powder spreading device spreads the metal powder on the processed current layer, and the layer-by-layer processing is carried out until the whole part is processed.
Because the powder is excessive in the powder spreading process of the traditional powder feeding type scraper, and powder overflows from the two sides of the scraper, the quantity of raw material metal powder required by printing is large, the metal powder is wasted, and in order to ensure that the powder in a forming area is uniformly and completely spread, the volume of the powder in a feeding area is at least 150% of the volume of the powder required in the forming area. In order to solve the problem, residual powder generated in the unidirectional powder-laying metal additive manufacturing process needs to be filtered and recycled.
At present, several powder filtering and circulating devices are used for powder spreading and circulating in an upper powder feeding mode, for example, renishao RenAM 500Q equipment is internally provided with an integrated screening and powder recycling device, redundant powder at two sides can be sucked and then automatically screened to obtain available powder and waste powder, and the treated powder is spread by an upper powder feeder for recycling. The invention discloses an automatic powder drying-screening-recycling device and method for additive manufacturing equipment, which are disclosed by Korla et al. However, a powder filtration and circulation device for the downward powder feeding system is not known at present.
[ summary of the invention ]
The present invention is to overcome the above disadvantages of the prior art, and provides a residual powder circulating device and method for additive manufacturing of metal with powder fed downward, so as to solve the problem of the prior art that a powder circulating filtering circulating device with a downward powder feeding mode is not available.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a residual powder circulating device for additive manufacturing of lower powder feeding metal comprises a scraper device and a residual powder filtering circulating device; the scraper device is arranged in front of the residual powder filtering and circulating device;
the scraper device comprises a scraper device shell, a scraper is arranged in the scraper device shell, and the lower end of the scraper protrudes out of the lower end face of the scraper device shell;
the residual powder filtering and circulating device comprises a powder suction device, the powder suction device is communicated to an air suction port of the fan, an air outlet of the fan is communicated to the powder feeding box, the powder feeding box is communicated to the filtering device, a powder outlet of the filtering device is communicated to the residual powder collecting tank, and the residual powder collecting tank is detachably connected with the scraper device shell through the grid card connecting device.
A further development of the invention is that,
preferably, two sides of the scraper are respectively provided with a baffle clamp.
Preferably, the baffle clamp is an arc surface.
Preferably, the powder feeding box is communicated with the filtering device through a powder feeding pipeline, and an outlet of the powder feeding pipeline penetrates through the upper end face of the filtering device.
Preferably, be provided with useless powder jar on filter equipment's the rear side wall, filter equipment's inside is provided with filter screen and swash plate, and the swash plate is in the below of filter screen, and the front end setting of swash plate is in surplus powder collecting tank, and the rear end of filter screen lets in to useless powder jar in.
Preferably, the filter screen comprises a first-stage filter screen and a second-stage filter screen, and the waste powder tank comprises a first-stage waste powder tank and a second-stage waste powder tank; the rear end of the first-stage filter screen is introduced into the first-stage waste powder tank, the rear end of the first-stage filter screen is introduced into the second-stage waste powder tank, and the first-stage filter screen is arranged above the second-stage filter screen.
Preferably, the mesh number of the filter screens is 270 meshes or 325 meshes, and the mesh numbers of the first-stage filter screen and the second-stage filter screen are the same.
Preferably, an ultrasonic vibrator is arranged on the outer side of the front side wall of the filtering device.
Preferably, check card connecting device includes first check card connector and second check card connector, and first check card connector sets up on surplus powder holding vessel, and second check card connector sets up on scraper device shell.
A working method of the residual powder filtering and circulating device manufactured by the powder feeding metal additive manufacturing,
when the additive manufacturing is carried out by the lower powder feeding metal additive manufacturing device, when the additive manufacturing is suspended, the scraper device pushes the powder to the front of the powder suction device, and the scraper device returns to the initial position; the powder suction device sucks powder, the fan sends the powder sucked by the powder suction device into the powder sending box, the powder sending box sends the sucked powder into the filtering device, and the powder enters the residual powder collecting tank after being filtered;
when the feeding cylinder metal powder of the additive manufacturing device is not enough, the residual powder collecting tank and the scraper device are connected through the grid card connecting device, the scraper device drives the residual powder collecting tank to move forwards, the residual powder collecting tank is driven to be right above the feeding cylinder in the additive manufacturing device, the residual powder collecting tank tilts to pour the powder into the feeding cylinder, and the scraper device transports the residual powder collecting tank back to the initial position.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a residual powder circulating device for additive manufacturing of metal with lower powder feeding. The scraper device comprises a scraper device shell, a metal scraper, two side baffle clamps, a ball screw, a motor and a check clamp connector; the residual powder filtering and circulating device comprises a powder suction device, a fan, an air supply pipeline, a multi-stage filter screen, an ultrasonic vibration device, a waste powder collecting tank and a residual powder collecting tank. The powder spreading process in the powder bed additive manufacturing in the lower powder feeding mode can be optimized, meanwhile, the generated excessive metal powder is automatically filtered, when the powder in the feeding area is used up, the feeding area is lowered under the condition that a cabin door is not opened, and then the processed residual powder is added into the feeding area through the scraper device for powder recycling. The metal powder printing device is simple in structure, not only can improve the use efficiency of metal powder in the printing process and save the raw material cost, but also can avoid the interruption of the printing process and the influence of the cabin opening and powder adding process on the product quality due to insufficient powder. Practice thrift and print in-process metal powder use amount, practice thrift metal vibration material disk manufacturing cost, can avoid moreover because the powder is not enough and lead to printing the process interrupt, the influence of the powder process to product quality is added in the cabin of opening.
Furthermore, baffle plate clamps are arranged on two sides of the scraper, so that powder can be conveniently collected.
Furthermore, the baffle plate clamp is an arc surface, so that gathering in the powder collecting process is facilitated.
Further, the outlet of the powder feeding pipe is arranged at the upper part of the filtering device, so that the powder entering the filtering device can fall on the filter screen through the action of gravity.
Furthermore, be provided with the useless powder jar that is used for collecting useless powder on filter equipment's the rear side wall, the powder after the filtration is sent into to surplus powder collecting tank through the swash plate.
Furthermore, the filter screen is provided with two layers, and the filtering effect is guaranteed.
Furthermore, the mesh number of the filter screen is limited, so that the granularity of the filtered powder can meet the requirement of the metal powder for printing, and the mesh number of the filter screen can be adjusted according to the actual requirement.
Further, the ultrasonic vibrator is arranged on the filtering device, so that materials on the filter screen can be sent into the waste powder tank or the residual powder collecting tank, the materials on the filter screen cannot be accumulated, and the filtering efficiency is improved.
The invention also discloses a working method of the residual powder circulating device for the additive manufacturing of the metal with the lower powder feeding, the method carries out automatic filtration treatment on the generated excessive metal powder in the additive manufacturing process, when the powder in the feeding area is used up, the feeding area is lowered under the condition of not opening the cabin door, and then the treated residual powder is added into the feeding area through the scraper device for powder recycling.
[ description of the drawings ]
FIG. 1 is a partial schematic view of an embodiment of the present invention;
FIG. 2 is an overall schematic top view of an embodiment of the present invention;
FIG. 3 is a schematic view of a doctor apparatus according to an embodiment of the invention;
(a) The figure is a left side view; (b) the figure is a front view; (c) the figure is a right side view; FIG. d is a top view;
FIG. 4 is a schematic view of the scraper device and the residual powder collecting tank according to an embodiment of the present invention;
(a) FIG. is a front view; (b) the figure is a right side view;
the method comprises the following steps of 1-printing platform, 2-scraper device, 3-powder suction device, 4-first grid card connector, 5-residual powder collecting tank, 6-ball screw, 7-ultrasonic vibrator, 8-vibrating plate, 9-powder conveying pipeline, 10-filter screen, 11-first-level waste powder tank, 12-second-level waste powder tank, 13-inclined plate and 14-powder conveying box; 15-a fan, 16-a printer shell, 17-a feeding cylinder, 18-a forming cylinder, 19-a residual powder filtering circulating device, 20-a scraper device shell, 21-a scraper, 22-a baffle clamp, 23-a motor, 24-a second check card connector, 25-a sliding block, 26-a movable plate and 27-a filtering device; 28-connecting plate.
[ detailed description ] A
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a residual powder filtering and circulating device for powder bed type unidirectional powder-laying metal additive manufacturing, which comprises a scraper device 2 and a residual powder filtering and circulating device 19. The scraper device 2 and the residual powder filtering and circulating device 19 are both installed on the printing platform 1, the scraper device 2 moves on the printing platform 1 in a reciprocating linear mode, and the residual powder filtering and circulating device 19 is fixed on one side of the forming area 17 in the additive manufacturing device. In the present invention, the scraper device 2 is set in front of the residual powder filtering and circulating device 19, that is, referring to fig. 1, the left side is front, and the right side is back, and the following description is based on this, and will not be described again.
Referring to fig. 1 and 3, the doctor apparatus 2 includes a slide block 25, a doctor apparatus housing 20, a doctor blade 21, two side fence clips 22, and a grid connection tab 4; the upper end of scraper device shell 20 is provided with two sliding blocks 25, and each sliding block 25 suit is on a ball 6, and the one end of ball 6 is fixed to be set up on printer shell 16, and the other end of ball 6 is fixed to be set up on surplus powder filtering cycle device 19, is provided with the motor on the sliding block 25, through its motion on ball 6 of motor drive, drives scraper device shell 20 simultaneously and does reciprocal linear motion.
The scraper 21 is made of metal, a clamping groove is formed in the bottom of the scraper device 20, the scraper 21 is fixedly arranged inside the scraper device shell 20, the lower portion of the scraper 21 penetrates through the clamping groove and protrudes out of the lower portion of the scraper device shell 20, and the lower end face of the metal scraper 21 is lower than the lower end face of the scraper device shell 20 in the horizontal direction; two sides of the scraper device shell 20 are respectively provided with a baffle plate clamp 22, the two baffle plate clamps 22 are connected through a connecting plate 28, the bottoms of the two baffle plate clamps 22 are flush with the bottom of the scraper 21, the connecting plate 28 is fixedly arranged on the scraper device shell 20 through a compression spring, so that the two baffle plate clamps 22 are convenient to replace, the baffle plate clamps 22 are installed to scrape powder overflowing from the two sides of the scraper, preferably, the baffle plate clamps 22 are curved, and the baffle plate clamps 22 are bent towards the direction of the residual powder collecting tank 5, namely, bent backwards and protruded forwards, so that the powder is convenient to collect; the inside of scraper device shell 20 is provided with motor 3, and motor 3's output is connected with second check card connector 24, the welding of second check card connector 24 is on the rear side wall of scraper device shell 20, the welding of the front end of surplus powder collecting tank 5 has first check card connector 4, and when the feed area powder was used up, first check card connector 4 and the cooperation of 4 interconnect of second check card connector played the effect of connecting surplus powder collecting tank 5.
Referring to fig. 1, the residual powder filtering and circulating device 19 includes a powder suction device 3, a blower 15, an air supply duct 10, a filtering device 27, an ultrasonic vibrator 7, a waste powder collecting tank, and a residual powder collecting tank 5. The residual powder filtering and circulating device 19 is fixedly arranged on the upper portion of the printing platform 1, and preferably, the residual powder filtering and circulating device 19 is connected with the printing platform 1 through threads.
Referring to fig. 4, further, the powder suction device 3 and the fan 15 are located at the lowest part of the residual powder filtering and circulating device 19, the powder suction device 3 is located in front of the fan 15, a gap is formed between the lower end surface of the powder suction device 3 and the printing platform 1, and when the scraper device 2 scrapes the surplus powder into the region, the powder suction device 3 starts to work to suck the powder into the filtering device; the fan 15 is positioned at the upper part of the rear side of the powder suction device 3, an air suction port of the fan 15 is communicated with an output port of the rear side of the powder suction device 3, an air supply port of the fan 15 is communicated with the powder feeding box 14, and powder collected by the powder suction device 3 is fed to the upper part of the filtering device 27 through the powder feeding box 14 by the fan 15; the powder feeding box 14 is arranged above the powder suction device 3 and the fan 15, and the upper part of the powder feeding box 14 is provided with a filtering device 27. A part of the lower end surface of the powder feeding box 14 is in contact with the upper end surface of the powder suction device 3, and a part of the lower end surface is in contact with the upper end surface of the fan 15. Preferably, the powder feeding box 14 is communicated with the upper part of the filtering device 27 through the powder feeding pipeline 9, the residual powder collecting tank 5 is arranged in front of the filtering device 27, the residual powder collecting tank 5 is arranged on the upper part of the powder sucking device 3, the residual powder collecting tank 5 is arranged below the front part of the filtering device 27 and is arranged above the powder sucking device 3, the residual powder collecting tank 5 is arranged between the scraper device 2 and the filtering device 27, the movable plate 26 is arranged on the side edge of the residual powder collecting tank 5, and when the residual powder collecting tank 5 is overturned, the lower end of the movable plate 26 is opened, and the metal powder is poured out.
The filter device 27 is internally provided with a primary filter screen, a secondary filter screen and an inclined plate 13 from top to bottom in sequence. The output end of the powder feeding pipeline 9 is arranged above the primary waste powder tank 11, and preferably, the output end of the powder feeding pipeline 9 is introduced into the filtering device 27 through the upper end surface of the filtering device 27. The front end card dress of one-level filter screen is on filter equipment's preceding lateral wall, and the rear side card of one-level filter screen is on filter equipment 27's back lateral wall, and the front end of one-level filter screen is higher than the rear end, and the rear end of one-level filter screen leads to the useless powder jar 11 of one-level, the useless powder jar 11 of one-level sets up on filter equipment's lateral wall. The front end of the secondary filter screen is clamped on the front side wall of the filter device 27, the rear side of the secondary filter screen is clamped on the rear side wall of the filter device, the front end of the secondary filter screen is higher than the rear end, the rear end of the secondary filter screen leads to the secondary waste powder tank 12, and the secondary waste powder tank 12 is arranged on the outer side wall of the filter device 27; the secondary filter screen is arranged below the primary filter screen, and the secondary waste powder tank 12 is arranged below the primary waste powder tank. Preferably, the primary filter screen and the secondary filter screen are both connected to the side wall of the filter device 27 through clamping grooves, and can be detached and conveniently replaced; preferably, the first-stage filter screen and the second-stage filter screen adopt filter screens with the same mesh number (270 meshes or 325 meshes are generally selected according to different materials), and the irregular powder slag, large adhesive particles and other powder generated in the printing process are collected into the first-stage waste powder tank 11 and the second-stage waste powder tank 12 through two-stage filtration; the first-stage waste powder tank 11 and the second-stage waste powder tank 12 are clamped on the rear side wall of the shell of the filtering device 27 through clamping grooves; the interior of the filter device 27 is also clamped with an inclined plate 13, two ends of the inclined plate 13 are respectively clamped and loaded on the front side wall and the rear side wall of the filter device 27, the rear end of the inclined plate 13 is higher than the front end of the inclined plate, the front side wall of the filter device 27 is provided with an opening, so that the front end of the inclined plate 13 penetrates through the front side wall of the filter device 27, the front end of the inclined plate 13 is communicated to the interior of the residual powder collecting tank 5, and the powder after secondary filtration rolls into the residual powder collecting tank 5 through the slope of the inclined plate 13; the ultrasonic vibrator 7 is fixedly disposed on the housing at the front side of the filtering device 27 by screw-coupling.
Referring to fig. 2, the additive manufacturing printer comprises a printer housing 16, a feeding cylinder 17 and a forming cylinder 18 are arranged in the printer housing 16, the feeding cylinder 17 is arranged in front of the forming cylinder 18, a printing platform 1 is arranged on the upper portion of the printer housing 16, a scraper 21 is arranged above the printing platform 1, the feeding cylinder 17 and the forming cylinder 18 are arranged in the printing platform 1, a feeding area is arranged above the feeding cylinder 17, and a forming area is arranged above the forming cylinder 18.
The working method of the device comprises the following steps:
with reference to fig. 1 and 2, a specific implementation process of a powder bed type residual powder filtering and circulating device for unidirectional powder-laying metal additive manufacturing is as follows:
the feeding cylinder 17 rises to a certain height, the forming cylinder 17 descends by a layer thickness, the scraper device 2 moves from front to back, powder in the feeding cylinder 17 is spread into the forming cylinder 17, redundant powder is scraped into the redundant powder filtering device 18, the redundant powder filtering device 18 is started to filter the powder and then store the filtered powder in the redundant powder collecting tank 5, the scraper device 2 returns to the initial position (shown as the position in figure 1), the laser beam selectively melts metal powder on the substrate according to the filling contour line of the current layer, the current layer is processed, and formed parts are stacked layer by layer.
Further, when the residual powder filtering and circulating device 19 is started, powder is firstly collected into the powder feeding box 14 through the combined action of the powder sucking device 3 and the fan 15, and then is fed into the upper part of the filtering device 27 through the powder feeding channel 10; collecting powder such as irregular powder slag, bonding large particles and the like generated in the printing process into a primary waste powder tank 11 and a secondary waste powder tank 12 through a primary filter screen and a secondary filter screen; the ultrasonic vibration device 7 is connected with the multistage filter screen through the vibrating plate 8, and the screening efficiency is improved through the ultrasonic vibration and a certain inclination angle of the screen. The powder after the secondary filtration rolls into the residual powder collecting tank 5 through the slope of the inclined plate 13; the inclined plate 13 is connected to the main body of the filter unit 27 through a clamping groove, and the lowest part of the inclined plate 13 passes through an opening on the shell of the filter unit 27 and is inserted into the residual powder collecting tank 5.
When powder in a feeding cylinder 17 in the additive manufacturing printer is used up, under the condition that a cabin door is not opened, the feeding cylinder 17 is lowered, then a motor 23 in a scraper device 2 drives a second grid card connector 24 to rotate, the second grid card connector is connected with a first grid card connector 4 on a residual powder collecting tank 5, the residual powder collecting tank 5 is conveyed to the position right above the feeding cylinder 17 through the movement of the scraper device 2, metal powder in the residual powder collecting tank 5 is poured into the feeding cylinder 17 through the rotation of the motor 23, and the feeding cylinder 17 levels a powder layer. After the metal powder is completely added into the feeding cylinder 17, the scraper device 2 moves back to the residual powder filtering and circulating device again, the grid card connecting head 4 is disconnected, the residual powder collecting tank 5 returns to the left lower part of the residual powder filtering and circulating device, the printing process is continued, the scraper device 2 and the residual powder filtering and circulating device 19 work in a coordinated mode, the residual powder in the unidirectional powder laying process is recycled, and the residual powder in the powder laying process can be recycled.
The rotating shaft of the motor 23 is connected with the check card connector in the rotating process of the motor 23 by welding, high-strength metal materials (such as high-strength steel and titanium alloy) are adopted, the diameter of the rotating shaft of the motor 23 is large, the residual powder collecting tank is made of materials with small density (such as magnesium alloy), and the rotating shaft of the motor 23 can bear all weight.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (6)
1. The residual powder circulating device for additive manufacturing of the metal with the powder fed downwards is characterized by comprising a scraper device (2) and a residual powder filtering circulating device (19); the scraper device (2) is arranged in front of the residual powder filtering and circulating device (19);
the scraper device (2) comprises a scraper device shell (20), a scraper (21) is arranged in the scraper device shell (20), and the lower end of the scraper (21) protrudes out of the lower end face of the scraper device shell (20); two sides of the scraper (21) are respectively provided with a baffle plate clamp (22); the baffle plate clamp (22) is a cambered surface;
the residual powder filtering and circulating device (19) comprises a powder sucking device (3), the powder sucking device (3) is communicated to an air suction port of a fan (15), an air outlet of the fan (15) is communicated to a powder feeding box (14), the powder feeding box (14) is communicated to a filtering device (27), a powder outlet of the filtering device (27) is communicated to a residual powder collecting tank (5), and the residual powder collecting tank (5) is detachably connected with a scraper device shell (20) through a grid card connecting device;
a waste powder tank is arranged on the rear side wall of the filtering device (27), a filtering net (10) and an inclined plate (13) are arranged inside the filtering device (27), the inclined plate (13) is arranged below the filtering net (10), the front end of the inclined plate (13) is arranged in the residual powder collecting tank (5), and the rear end of the filtering net (10) is introduced into the waste powder tank;
the filter screen (10) comprises a primary filter screen and a secondary filter screen, and the waste powder tank comprises a primary waste powder tank (11) and a secondary waste powder tank (12); the rear end of the first-stage filter screen is communicated into the first-stage waste powder tank (11), the rear end of the first-stage filter screen is communicated into the second-stage waste powder tank (12), and the first-stage filter screen is arranged above the second-stage filter screen.
2. The residual powder circulating device for lower powder feeding metal additive manufacturing according to claim 1, wherein the powder feeding box (14) is communicated with the filtering device (27) through a powder feeding pipeline (9), and an outlet of the powder feeding pipeline (9) penetrates through the upper end face of the filtering device (27).
3. The residual powder circulating device for bottom feed metal additive manufacturing according to claim 1, wherein the mesh number of the filter screen (10) is 270 meshes or 325 meshes, and the mesh numbers of the primary filter screen and the secondary filter screen are the same.
4. The residual powder circulating device for bottom feeding metal additive manufacturing according to claim 1, wherein an ultrasonic vibrator (7) is arranged outside the front side wall of the filtering device (27).
5. The residual powder circulating device for additive manufacturing of bottom feeding powder metal according to claim 1, wherein the grid card connecting device comprises a first grid card connector (4) and a second grid card connector (24), the first grid card connector (4) is disposed on the residual powder collecting tank (5), and the second grid card connector (24) is disposed on the scraper device housing (20).
6. The working method of the residual powder filtering and circulating device manufactured by the powder feeding metal additive manufacturing of the claim 1 is characterized in that,
when the additive manufacturing is carried out by the lower powder feeding metal additive manufacturing device, when the additive manufacturing is suspended, the scraper device (2) pushes powder to the front of the powder suction device (3), and the scraper device (2) returns to the initial position; the powder suction device (3) sucks powder, the fan (15) sends the powder sucked by the powder suction device (3) into the powder feeding box (14), the powder feeding box (14) sends the sucked powder into the filtering device (27), and the powder enters the residual powder collecting tank (5) after being filtered;
when feeding jar (17) metal powder of vibration material disk device is not enough, connect surplus powder collecting tank (5) and scraper device (2) through check card connecting device, scraper device (2) drive surplus powder collecting tank (5) and move forward, surplus powder collecting tank (5) are driven to give in the vibration material disk device directly over jar (17), and surplus powder collecting tank (5) tilt, pour the powder into feeding jar (17) in, scraper device (2) transport surplus powder collecting tank (5) back to initial position.
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| CN202110333893.1A CN113102776B (en) | 2021-03-29 | 2021-03-29 | Residual powder circulating device and method for additive manufacturing of bottom powder feeding metal |
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| CN202110333893.1A CN113102776B (en) | 2021-03-29 | 2021-03-29 | Residual powder circulating device and method for additive manufacturing of bottom powder feeding metal |
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| CN113102776B true CN113102776B (en) | 2022-11-22 |
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| CN114535617B (en) * | 2022-02-23 | 2023-04-25 | 深圳市金石三维打印科技有限公司 | Metal powder 3D printing system and printing method |
| CN114985770A (en) * | 2022-05-16 | 2022-09-02 | 哈尔滨工业大学 | Self-supporting 3D printing apparatus device of aluminum alloy extrusion moulding powder |
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