CN117774317B - Hot powder storage and delivery integrated system for additive manufacturing - Google Patents
Hot powder storage and delivery integrated system for additive manufacturing Download PDFInfo
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- CN117774317B CN117774317B CN202410211816.2A CN202410211816A CN117774317B CN 117774317 B CN117774317 B CN 117774317B CN 202410211816 A CN202410211816 A CN 202410211816A CN 117774317 B CN117774317 B CN 117774317B
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- 239000000843 powder Substances 0.000 title claims abstract description 313
- 238000003860 storage Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000000654 additive Substances 0.000 title claims abstract description 16
- 230000000996 additive effect Effects 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 abstract description 18
- 230000007547 defect Effects 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007849 functional defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- -1 meanwhile Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
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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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- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention belongs to the technical field of additive manufacturing powder feeding, and discloses a hot powder storage and feeding integrated system for additive manufacturing. The invention can shorten the travel of the powder spreading scraper, can utilize the upper powder feeding system to continuously feed powder to the lower powder feeding cylinder, greatly improves the production efficiency, and preheats the powder before spreading the powder, greatly reduces the moisture in the powder, avoids the defects of air holes, cracks, unfused and the like caused by larger temperature difference of the powder entering a molten pool area, and is beneficial to reducing the deformation and the hot cracking of a formed part.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing powder feeding, and particularly relates to a hot powder storage and feeding integrated system for additive manufacturing.
Background
The powder delivery system is the main system of all laser melting (LASER MELTING) and laser sintering (LASER SINTERING) which take powder as raw materials. In 1986, the laser sintering patent adopted a lower powder feeding system (the powder feeding system is below the forming chamber, as shown in fig. 1), and fig. 1 (a) shows a state before powder scraping: the powder feeding piston of the powder feeding cylinder 1 is lifted, quantitative powder 2 is pushed onto a powder feeding cylinder platform, the powder spreading scraper 3 moves rightwards, part of powder is pushed into a powder receiving space 5 (a state shown in fig. 1 (b)) of the powder receiving cylinder 4, and then the powder spreading scraper returns to finish one-time powder spreading; the powder collecting piston of the powder collecting cylinder is downwards displaced by a layer thickness distance to form a new powder collecting space; the powder feeding piston moves upwards again, quantitative powder is pushed onto the powder feeding cylinder platform, and the powder spreading scraper moves rightwards again, so that powder spreading is completed again. By analogy, the SLM and SLS shaping process is completed. The underneath type powder feeding system has the advantages that each powder feeding can be quantitatively and accurately finished, and the powder feeding system is irrelevant to the state (humidity, particle roundness and material type of powder) of the powder and the oxygen content of the forming chamber.
In the beginning of the century, SLS and SLM for feeding powder were developed with the powder feeding system in the forming chamber and the powder inlet outside the forming chamber, as shown in fig. 2, the powder feeding box 6 was hermetically connected to the forming chamber and isolated from the atmosphere. The upper powder feeding system has the greatest advantages that: powder can be fed at any time in the printing process: the external powder is connected with a powder feeding system in a sealing way at the upper end A of the powder feeding box, a powder feeding valve B is opened, new powder enters the powder box (the atmosphere is isolated from the outside), the powder feeding valve B is closed, a powder discharging valve C is opened, the powder falls on a forming platform under the action of a vibrator 7 and gravity, and is paved by a powder paving scraper 3; another advantage of overhead powder feeding is that the doctor blade has a short stroke for laying the powder. The main disadvantage of overhead powder feeding is the high requirements on the state of the powder (shape, sphericity, particle size range and humidity of the powder), which can lead to difficulties in powder feeding.
The existing underneath type powder feeding system has certain technical advantages, but certain functional defects exist in the using process: (1) The powder feeding cylinder 1 of the existing underneath type powder feeding system has large volume and occupies a large part of a forming platform, so that the powder scraping stroke is increased, the time is wasted, the production efficiency is reduced, and the preheated powder is cooled and the temperature is uneven due to longer moving time of a scraper, so that the defects of air holes, cracks, unfused and the like are generated; (2) The powder amount in the powder feeding cylinder 1 of the existing underneath type powder feeding system is often insufficient to complete the forming of a formed piece, the powder feeding cylinder needs to be stopped and fed with powder during forming, nitrogen is filled after that, printing can be continued after the oxygen content is reduced, the operation is troublesome, and the production efficiency is greatly reduced; (3) Moisture exists in powder in a powder feeding cylinder 1 of the existing underneath type powder feeding system, so that the temperature difference of the powder entering a molten pool area is large, and defects such as air holes, cracks, unfused and the like are caused. Therefore, the structure of the existing powder feeding system needs to be optimized, the overhead powder feeding system can be utilized to enable the underneath powder feeding cylinder to be supplemented with new powder at any time, the equipment does not need to be stopped for powder feeding and nitrogen charging operation, the size of the underneath powder feeding cylinder is reduced, the stroke of a powder laying scraper is effectively reduced, and the powder is preheated to remove moisture.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a hot powder storage and delivery integrated system for additive manufacturing, so that the underneath type powder delivery system can be supplemented with new powder at any time, the equipment does not need to be stopped for powder feeding and nitrogen charging, the stroke of a powder spreading scraper is effectively reduced, and the powder is preheated to remove moisture.
In order to achieve the above purpose, the technical solution of the present invention is as follows:
A hot powder stores up and send integrated system for additive manufacturing, includes forming box, its characterized in that: the upper end of the forming box is provided with an upper powder feeding box, a powder feeding port at the lower end of the upper powder feeding box is communicated with the inside of the forming box, an upper powder feeding control assembly is arranged between the upper powder feeding port and the forming box, the lower end of the forming box is provided with a lower powder feeding cylinder, the lower powder feeding cylinder is positioned right below the upper powder feeding box, the upper end of the lower powder feeding cylinder is provided with a storage cavity communicated with the inside of the forming box, the horizontal section of the storage cavity is a narrow rectangular, and the lower end of the storage cavity is provided with a heating bottom plate for powder preheating treatment and a lower powder feeding control assembly for quantitatively feeding powder in the storage cavity upwards.
Preferably, the upper end of the upper powder feeding box is provided with a powder inlet and a powder quantity sensor, and the detection end of the powder quantity sensor extends into the upper powder feeding box and extends to the powder feeding opening.
Preferably, a flow guide pipe is arranged in the forming box, the upper end of the flow guide pipe extends to the outer side of the forming box and is connected with an upper powder feeding control assembly, the upper powder feeding control assembly is connected with a powder feeding port, a gap is reserved between the lower end of the flow guide pipe and the inner wall of the bottom of the forming box, and the material storage cavity is located under the flow guide pipe.
Preferably, the overhead powder feeding control assembly comprises a shell, a rotating shaft and a powder feeding motor, wherein the shell is of a hollow narrow strip cuboid structure with openings at the upper end and the lower end, a vibrator is arranged on the outer side face of the shell, a rotating shaft matched with the inner diameter of the shell is rotatably connected inside the shell, the rotating shaft is horizontally arranged along the length direction of the shell, one end of the rotating shaft extends to the outer side of the shell and is connected with the powder feeding motor, and a powder passing hole is formed in the circumferential face of the rotating shaft in a penetrating mode.
Preferably, the powder passing holes are through holes which are arranged along the length direction of the rotating shaft and matched with the length of the shell, or are formed by a plurality of single holes which are uniformly distributed at intervals along the length direction of the rotating shaft.
Preferably, a rotary sealing tetrafluoro base plate is arranged between the rotating shaft and the inner wall of the shell.
Preferably, the lower powder feeding control assembly comprises a piston which is in up-down sealing sliding connection with the inner wall of the lower powder feeding cylinder and a piston rod which is connected with the lower end of the piston, the lower end of the piston rod is connected with an electric cylinder, and the heating bottom plate is overlapped at the upper end of the piston.
Preferably, a fixed bottom plate is connected between the electric cylinder and the underneath type powder feeding cylinder, a first cooling loop is arranged in the fixed bottom plate, and two ends of the first cooling loop are connected with a first water inlet and a first water outlet.
Preferably, a heat insulation plate is arranged between the piston and the heating bottom plate, a second cooling loop is arranged in the piston, and two ends of the second cooling loop are connected with a second water inlet and a second water outlet.
Preferably, the outside of the lower powder feeding cylinder is coated with an insulating layer.
Compared with the prior art, the invention has the following beneficial effects:
(1) Compared with a conventional lower powder feeding system, the lower powder feeding cylinder has the advantages that the stroke of the powder spreading scraper is greatly shortened by about 1/3 of the conventional scraper stroke; it should be noted that during SLM and SLS forming, the doctor blade runs tens of thousands of times up to tens of thousands of times, even more than 10 tens of thousands of times, and the time savings are considerable;
(2) According to the invention, the upper powder feeding box and the upper powder feeding control assembly can be used for continuously feeding and adding powder for the lower powder feeding cylinder, so that the operation of stopping and charging nitrogen is not needed, and the production efficiency is greatly improved;
(3) When the lower powder feeding cylinder feeds powder in the forming box, the powder can be preheated, so that the moisture in the powder is greatly reduced, and the defects of air holes, cracks, unfused and the like caused by larger temperature difference of the powder entering a molten pool area are avoided;
(4) The structure of the lower powder feeding cylinder is a prolate structure (narrow rectangular structure), the powder amount in the lower powder feeding cylinder is relatively limited, the heating bottom plate can uniformly and effectively heat the powder, and meanwhile, the powder is rapidly pushed to a forming platform in the forming box at a short distance, so that the temperature of the powder is effectively kept, and the deformation and the hot cracking of a formed part are reduced.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a schematic diagram of a prior art underneath type powder feeding system;
FIG. 2 is a schematic diagram of a top-mounted powder feeding system in the prior art;
FIG. 3 is a schematic diagram of the structure of the present invention;
FIG. 4 is a schematic diagram of a front view of the present invention;
FIG. 5 is a schematic view of the D-D cross-sectional structure of FIG. 4 according to the present invention;
FIG. 6 is an enlarged schematic view of the structure of FIG. 5E according to the present invention;
FIG. 7 is a schematic view showing the internal structure of a housing of the overhead powder feeding control assembly of the present invention;
FIG. 8 is a schematic view of the G-G cross-sectional structure of FIG. 4 according to the present invention;
FIG. 9 is a schematic view of the H-H cross-sectional structure of FIG. 4 according to the present invention;
In the figure: 1. the powder feeding device comprises a lower powder feeding cylinder, 2, powder, 3, a powder spreading scraper, 4, a powder receiving cylinder, 5, a powder receiving space, 6, an upper powder feeding box, 7, a vibrator, 8, a forming box, 9, a powder feeding port, 10, a storage cavity, 11, a heating bottom plate, 1101, a heating block, 12, a powder amount sensor, 13, a flow guide pipe, 14, a gap, 15, a shell, 16, a rotating shaft, 17, a powder feeding motor, 18, a powder passing hole, 1801, a single hole, 19, a rotary sealing tetrafluoro base plate, 20, a piston, 21, a piston rod, 22, an electric cylinder, 23, a fixed bottom plate, 24, a first cooling circuit, 2401, a first water inlet, 2402, a first water outlet, 25, a second cooling circuit, 2501, a second water inlet, 2502, a second water outlet, 26, a heat insulating layer, 27, a powder inlet, 28, a powder sealing element, 29, a gas sealing element, 30, a heat insulating plate, 31 and a vibrator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "middle," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected or detachably connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 3, fig. 4 and fig. 5, a thermal powder storage and delivery integrated system for additive manufacturing is shown, which comprises a forming box 8, the upper end of the forming box is provided with an upper powder delivery box 6, a powder delivery port 9 at the lower end of the upper powder delivery box is communicated with the inside of the forming box, an upper powder delivery control component is arranged between the upper powder delivery box and the forming box, the upper powder delivery control component is used for controlling the delivery of powder of the upper powder delivery box to a lower powder delivery cylinder, the upper end of the upper powder delivery box is provided with a powder inlet 27 and a powder sensor 12, the detection end of the powder sensor extends into the inside of the upper powder delivery box and extends to the position of the powder delivery port, the upper powder delivery box 6 is supplemented by the powder inlet, the powder quantity in the upper powder delivery box is monitored by the powder quantity sensor, the upper powder delivery box is connected with a control system of forming equipment, the upper powder delivery box is of a trapezoid or inverted cone structure, the diameter of the lower end of the upper powder delivery box is smaller than the diameter of the upper end, a honeycomb duct 13 is avoided to remain inside the powder, the upper powder delivery box is provided with a honeycomb duct 13, the upper powder delivery end is connected with a lower powder delivery cylinder, and a gap is formed between the upper powder delivery box and the upper powder delivery box is connected with a doctor blade through the upper powder delivery control component, and the lower powder delivery assembly is conveniently arranged between the upper powder delivery box and the lower powder delivery box.
Referring to fig. 3 and 7, the upper powder feeding control assembly comprises a casing 15, a rotating shaft 16 and a powder feeding motor 17, wherein the casing is of a hollow narrow rectangular structure with openings at the upper end and the lower end, a vibrator 31 is arranged on the outer side surface of the casing, the powder feeding efficiency of the casing is improved, blocking is avoided, the rotating shaft matched with the inner diameter of the casing is rotatably connected in the casing, the rotating shaft is horizontally arranged along the length direction of the casing, the two ends of the rotating shaft are rotatably connected with the casing through bearings, the connecting part of the rotating shaft is sealed by adopting a sealing ring, one end of the rotating shaft extends to the outside of the casing and is connected with the powder feeding motor through a coupler, a powder passing hole 18 is arranged on the circumferential surface of the rotating shaft in a penetrating manner, the powder passing hole is a penetrating hole which is arranged along the length direction of the rotating shaft and is uniformly distributed at intervals along the length direction of the rotating shaft or is formed by a plurality of single holes 1801 which are uniformly distributed at intervals along the length direction of the rotating shaft, the single holes are communicated into a whole to form a penetrating hole, and the powder passing hole is positioned on the same plane with the central axis of the rotating shaft, after the powder feeding motor rotates by a certain angle, the powder passing hole is in a vertical state, the powder feeding port 9 at the lower end of the upper powder feeding box is communicated with a honeycomb duct in the powder feeding box 13, and enters into the upper powder feeding box; when the powder feeding motor continues to rotate for a certain angle, the powder passing hole is in a horizontal and closed state, powder cannot enter the guide pipe, a rotary sealing tetrafluoro base plate 19 is arranged between the rotating shaft and the inner wall of the shell, so that the sealing performance of the rotary sealing tetrafluoro base plate is effectively improved, and the powder in the upper powder feeding box is prevented from falling into the forming box under the normal working state.
As shown in fig. 3, fig. 4 and fig. 5, the lower end of the forming box is provided with the lower powder feeding cylinder 1, the lower powder feeding cylinder is positioned right below the upper powder feeding box, powder in the upper powder feeding box conveniently enters the lower powder feeding cylinder through a guide pipe in the forming box, the upper end of the lower powder feeding cylinder is provided with the material storage cavity 10 communicated with the inside of the forming box, the material storage cavity is positioned right below the guide pipe, the powder in the upper powder feeding box can fall into the material storage cavity in the lower powder feeding cylinder after entering the guide pipe, the horizontal section of the material storage cavity is narrow, the movement stroke of the powder spreading scraper can be shortened by about 1/3 of the conventional scraper stroke, and the scraper can be operated for tens of thousands of times or even more than 10 tens of thousands of times in the SLM and SLS forming process, so the time for solving the stroke of 1/3 is quite considerable, and the production efficiency can be greatly improved. The heating bottom plate 11 for powder preheating treatment and the underlying powder feeding control assembly for realizing quantitative powder feeding upwards of powder in the storage cavity are arranged at the lower end of the storage cavity, the heating bottom plate can heat the powder, moisture can be eliminated, the temperature of the powder can be increased, and the defects of air holes, cracks, unfused and the like caused by large temperature difference between the powder and a molten pool area after the powder is pushed to a forming platform inside a forming box by the underlying powder feeding control assembly are avoided, so that deformation and hot cracking of a formed part are reduced, an insulating layer 26 is coated outside the underlying powder feeding cylinder, and the insulating layer adopts an insulating asbestos plate to reduce heat overflow.
In order to realize quantitative powder feeding of the lower powder feeding cylinder to the forming platform in the forming box, as shown in fig. 3, 4, 5 and 6, the lower powder feeding control assembly comprises a piston 20 in up-down sealing sliding connection with the inner wall of the lower powder feeding cylinder and a piston rod 21 connected to the lower end of the piston, the lower end of the piston rod is connected with an electric cylinder 22, the electric cylinder is connected with a control system of forming equipment, each quantitative powder feeding is realized by controlling the rising height of the piston rod and the piston, a heating bottom plate is overlapped at the upper end of the piston, a heating block 1101 is arranged in the heating bottom plate, the heating block is an electric heating block, in the embodiment, a heat insulation plate 30 is arranged between the heating bottom plate and the piston, heat conduction between the heating bottom plate and the piston is reduced, an airtight piece is sleeved on the periphery of the piston, the airtight piece is ensured to ensure good tightness between the piston and the inner wall of the lower powder feeding cylinder, inert gas is prevented from passing through, powder in the upper powder feeding box is prevented from passing through the inner wall of the lower powder feeding cylinder, powder in the lower powder feeding cylinder is prevented from passing through a guide pipe, the electric bottom plate falls into a powder storage cavity in the lower powder feeding cylinder, the lower powder feeding box is arranged at the upper end of the bottom plate, the electric bottom plate is overlapped, the electric bottom plate is arranged at the upper end of the piston, a scraper is driven to be paved at the top of the bottom plate, and the bottom plate is driven to form the powder storage cavity, and is paved at the top, and is formed; and then the powder spreading scraper is reset, and the heating bottom plate is lifted again under the action of the electric cylinder, so that the powder spreading again is completed.
In order to reduce the heat conducted to the electric cylinder by the heating bottom plate, the normal work of the electric cylinder is prevented from being influenced, and double cooling of the piston and the fixing bottom plate is adopted. A fixed bottom plate 23 is connected between the electric cylinder and the lower powder feeding cylinder, and a first cooling loop 24 is arranged in the fixed bottom plate as shown in fig. 9, and two ends of the first cooling loop are connected with a first water inlet 2401 and a first water outlet 2402 for cooling the fixed bottom plate; meanwhile, as shown in fig. 8, a second cooling circuit 25 is arranged in the piston, two ends of the second cooling circuit are connected with a second water inlet 2501 and a second water outlet 2502, and the cooling medium adopted in the embodiment is water, so that cooling is realized through circulation flow of the cooling water.
The working principle of the invention is as follows:
As shown in fig. 3 to 9, when in operation, powder is firstly added into the upper powder feeding box 6 through the powder feeding port 27, the powder is conveyed by the powder feeding motor 17, meanwhile, the vibrator 31 vibrates, smooth flow of the powder is ensured, the powder enters the storage cavity 10 of the lower powder feeding cylinder 1 through the flow guide pipe 13, the heating bottom plate 11 preheats the powder to eliminate water in the powder, meanwhile, cooling water in the piston 20 and the fixing bottom plate 23 flows, and heat conduction between the heating bottom plate 11 and the electric cylinder 22 is reduced. Then, the electric cylinder 22 drives the piston 20 to rise through the piston rod 21, the piston 20 drives the heating bottom plate 11 and the powder on the upper surface of the heating bottom plate 11 to rise, quantitative powder is pushed onto the inner wall of the bottom of the forming box 8 (the upper end of the storage cavity of the lower powder feeding cylinder), the powder spreading scraper 3 works, the powder of the part is scraped to be spread, the powder spreading is reset after the powder spreading is finished, the electric cylinder 22 drives the piston 20 to rise again, quantitative powder is pushed onto the forming platform again, the powder spreading scraper 3 moves again, the powder spreading is finished again, and the like, and the SLM and SLS forming process is finished. When the powder in the lower powder feeding cylinder 1 is insufficient, the powder feeding motor 17 can be started again to convey the powder in the upper powder feeding box 6 into the lower powder feeding cylinder 1 for powder feeding, and the whole process does not need shutdown and nitrogen charging operation, so that the production efficiency is greatly improved.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. A hot powder stores up and send integrated system for additive manufacturing, includes forming box, its characterized in that: the upper end of the forming box is provided with an upper powder feeding box, a powder feeding port at the lower end of the upper powder feeding box is communicated with the inside of the forming box, an upper powder feeding control assembly is arranged between the upper powder feeding port and the inside of the forming box, the lower end of the forming box is provided with a lower powder feeding cylinder, the lower powder feeding cylinder is positioned right below the upper powder feeding box, the upper end of the lower powder feeding cylinder is provided with a storage cavity communicated with the inside of the forming box, the horizontal section of the storage cavity is in a narrow rectangular shape, the lower end of the storage cavity is provided with a heating bottom plate for powder preheating treatment and a lower powder feeding control assembly for realizing quantitative feeding of powder in the storage cavity upwards, the lower powder feeding control assembly comprises a piston which is connected with the inner wall of the lower powder feeding cylinder in an up-down sealing sliding manner, and a piston rod which is connected with the lower end of the piston, the lower end of the piston rod is connected with an electric cylinder, the heating bottom plate is superposed at the upper end of the piston, a heat insulation plate is arranged between the piston and the heating bottom plate, the inside of the piston is provided with a second cooling loop, two ends of the second cooling loop are connected with a second water inlet and a second water outlet, and a heat insulation layer is arranged outside the lower powder feeding control assembly.
2. A thermal powder storage and delivery integrated system for additive manufacturing as set forth in claim 1, wherein: the upper end of the upper powder feeding box is provided with a powder inlet and a powder quantity sensor, and the detection end of the powder quantity sensor extends into the upper powder feeding box and extends to the powder feeding opening.
3. A thermal powder storage and delivery integrated system for additive manufacturing as set forth in claim 1, wherein: the forming box is internally provided with a flow guide pipe, the upper end of the flow guide pipe extends to the outer side of the forming box and is connected with an upper powder feeding control assembly, the upper powder feeding control assembly is connected with a powder feeding port, a gap is reserved between the lower end of the flow guide pipe and the inner wall of the bottom of the forming box, and the material storage cavity is located under the flow guide pipe.
4. A thermal powder storage and delivery integrated system for additive manufacturing as claimed in claim 1 or 3, wherein: the upper powder feeding control assembly comprises a shell, a rotating shaft and a powder feeding motor, wherein the shell is of a hollow narrow strip cuboid structure with openings at the upper end and the lower end, a vibrator is arranged on the outer side face of the shell, the rotating shaft matched with the inner diameter of the shell is connected in a rotating mode, the rotating shaft is horizontally arranged along the length direction of the shell, one end of the rotating shaft extends to the outer portion of the shell and is connected with the powder feeding motor, and a powder passing hole is formed in the circumferential face of the rotating shaft in a penetrating mode.
5. A thermal powder storage and delivery integrated system for additive manufacturing as set forth in claim 4, wherein: the powder passing holes are through holes which are arranged along the length direction of the rotating shaft and matched with the length of the shell, or are formed by a plurality of single holes which are uniformly distributed at intervals along the length direction of the rotating shaft.
6. A thermal powder storage and delivery integrated system for additive manufacturing as set forth in claim 4, wherein: a rotary sealing tetrafluoro base plate is arranged between the rotating shaft and the inner wall of the shell.
7. A thermal powder storage and delivery integrated system for additive manufacturing as set forth in claim 1, wherein: the powder feeding device is characterized in that a fixed bottom plate is connected between the electric cylinder and the underneath type powder feeding cylinder, a first cooling loop is arranged in the fixed bottom plate, and two ends of the first cooling loop are connected with a first water inlet and a first water outlet.
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| CN202410211816.2A CN117774317B (en) | 2024-02-27 | 2024-02-27 | Hot powder storage and delivery integrated system for additive manufacturing |
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| CN202410211816.2A CN117774317B (en) | 2024-02-27 | 2024-02-27 | Hot powder storage and delivery integrated system for additive manufacturing |
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| CN117774317B true CN117774317B (en) | 2024-05-07 |
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| CN216885210U (en) * | 2021-12-31 | 2022-07-05 | 湖南华曙高科技股份有限公司 | Additive manufacturing cavity structure and equipment |
| CN115815631A (en) * | 2023-01-07 | 2023-03-21 | 福州大学 | Selective laser melting additive manufacturing device for composite structure metal component and working method |
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| CN107745517A (en) * | 2017-10-17 | 2018-03-02 | 武汉华科三维科技有限公司 | A kind of new rapid forming equipment and its auxiliary powder method of powder feeding |
| KR101855184B1 (en) * | 2017-11-24 | 2018-05-11 | 원광이엔텍 주식회사 | 3-dimensional printer having variable laser irradiation device |
| CN110560689A (en) * | 2019-09-29 | 2019-12-13 | 西安增材制造国家研究院有限公司 | Continuous circulation powder laying structure and additive manufacturing forming equipment |
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| CN216885210U (en) * | 2021-12-31 | 2022-07-05 | 湖南华曙高科技股份有限公司 | Additive manufacturing cavity structure and equipment |
| CN115815631A (en) * | 2023-01-07 | 2023-03-21 | 福州大学 | Selective laser melting additive manufacturing device for composite structure metal component and working method |
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