CN112893877A - Relay powder falling device suitable for large-breadth selective laser melting equipment - Google Patents
Relay powder falling device suitable for large-breadth selective laser melting equipment Download PDFInfo
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- CN112893877A CN112893877A CN202110318728.9A CN202110318728A CN112893877A CN 112893877 A CN112893877 A CN 112893877A CN 202110318728 A CN202110318728 A CN 202110318728A CN 112893877 A CN112893877 A CN 112893877A
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- powder hopper
- hopper
- conveying hose
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- 239000000843 powder Substances 0.000 title claims abstract description 156
- 238000002844 melting Methods 0.000 title claims abstract description 29
- 230000008018 melting Effects 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000007480 spreading Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 abstract description 20
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Classifications
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a relay powder dropping device suitable for large-breadth laser selective melting equipment, which is connected with a feeding mechanism and a laser forming system and comprises a powder hopper for feeding and a conveying hose for conveying powder, wherein the powder hopper comprises a transfer powder hopper and a relay powder hopper, a feeding port of the transfer powder hopper is connected with the feeding mechanism, two discharging ports are symmetrically arranged at the lower part of the transfer powder hopper, each discharging port is connected with one conveying hose, the conveying hose is connected with the feeding port of the relay powder hopper, a plurality of discharging ports are uniformly arranged at the lower part of the relay powder hopper, each discharging port is connected with the feeding port of a powder spreading mechanism of the laser forming system, and the relay powder hopper moves along with the laser forming system; each conveying hose is provided with a motion compensation device. The wide powder spreading mechanism can stably and efficiently convey metal powder in the feeding mechanism to move.
Description
Technical Field
The invention belongs to the field of metal additive manufacturing, and particularly relates to a relay powder falling device suitable for large-format laser selective melting equipment.
Background
The Selective Laser Melting (SLM) technique is an additive manufacturing method in which a Laser beam selectively heats and melts a powder material to deposit and form it layer by layer. The technological process is as follows: firstly, slicing a CAD model of a formed part to generate a laser scanning track of each sliced layer; then laying a layer of metal powder on the surface of the substrate positioned in the forming cylinder, controlling laser beams by a galvanometer system to scan and melt the metal powder bed in a selective manner, and rapidly cooling and solidifying a metal molten pool to form a deposition layer; and then, the substrate is lowered by the thickness of a slicing layer, and the processes of 'prearranged powder laying → selective laser melting → substrate lowering' are continuously repeated until the forming of all deposition layers is finished, and finally the integral manufacturing of the metal piece is realized.
The existing laser selective melting technology and equipment at home and abroad generally adopt a round or square forming cylinder and a base plate. This configuration is suitable for forming small-format parts, but when it is used to form large-format metal parts, it is necessary to fill the forming cylinder area with a large amount of redundant metal powder, resulting in a low powder utilization rate and a sharp increase in raw material cost, and therefore, large-format laser selective melting additive manufacturing equipment applies a "flexible forming cylinder" technique instead of a fixed forming cylinder. The flexible forming cylinder is adapted to the inner and outer contour of the large-size metal piece to be formed. The forming process is adjusted to "flexible forming cylinder establishment → accurate powder feeding, laying → SLM forming → forming system rising".
Although the 'flexible forming cylinder' technology can greatly reduce the dosage of the metal powder, for a large-breadth laser selective melting additive manufacturing device, the dosage requirement of the metal powder is larger due to the large volume of a formed part. The hopper for falling powder of the large-format selective laser melting equipment moves along with the laser forming system, and the movement stroke of the hopper depends on the height of a formed part. The metal powder in the powder bin to be fixedly installed is stably and efficiently conveyed to the moving powder spreading mechanism, and a telescopic elastic body (a telescopic hose) is inevitably required. For large-size forming parts, the length change of the telescopic hose is predicted to be very large, the conveying hose is in a continuous fluctuation state when powder falls in a reciprocating mode, the impact of the weight of metal powder on the pipe wall in the falling process can cause the stability and the efficiency of the powder falling to be greatly reduced, and even under the extreme condition, the conveying hose can be bent unpredictably to cause the situation that the powder cannot fall. In addition, the forming quality of the final formed part is affected by the powder falling uniformity in the powder falling width direction due to the large width of the formed part.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a relay powder falling device suitable for large-breadth laser selective melting equipment, which can realize uniform and stable feeding of a wide-breadth powder laying mechanism.
One technical scheme for achieving the above purpose is as follows: a relay powder falling device suitable for large-breadth laser selective melting equipment is connected with a feeding mechanism and a laser forming system and comprises a powder hopper for feeding and a conveying hose for conveying powder;
the powder hopper comprises a transfer powder hopper and a relay powder hopper, a feeding port of the transfer powder hopper is connected with the feeding mechanism and is kept relatively fixed, two discharging ports are symmetrically arranged at the lower part of the transfer powder hopper, each discharging port is connected with a conveying hose, the conveying hose is connected with the feeding port of the relay powder hopper, a plurality of discharging ports are uniformly arranged at the lower part of the relay powder hopper, each discharging port is connected with a feeding port of the powder spreading mechanism of the laser forming system, and the relay powder hopper moves along with the laser forming system;
each conveying hose is provided with a motion compensation device.
Furthermore, the motion compensation device comprises a guide sleeve, the inner diameter of the guide sleeve is slightly larger than the maximum outer diameter of the conveying hose, and the guide sleeve is sleeved outside the port of the conveying hose and connected with the feeding port of the relay powder hopper.
Furthermore, the motion compensation device comprises an extension spring, the inner diameter of the extension spring is slightly larger than the maximum outer diameter of the conveying hose, and the extension spring is sleeved on the whole outer side of the conveying hose and is respectively connected with the discharging port of the transfer powder hopper and the feeding port of the relay powder hopper.
Furthermore, the motion compensation device comprises an inner tension spring, the conveying hose is sleeved outside the inner tension spring, and ports on two sides of the conveying hose are respectively connected with the inner tension spring.
Furthermore, the transfer powder hopper and the relay powder hopper are internally provided with powder falling shunting mechanisms which can evenly distribute the powder to each feed opening.
Furthermore, charge level indicators are arranged on the powder hopper bodies of the transfer powder hopper and the relay powder hopper, and the powder is automatically added by arranging a pneumatic butterfly valve.
The relay powder dropping device suitable for the large-breadth laser selective melting equipment can effectively weaken the fluctuation of the conveying hose during the reciprocating powder dropping in the forming process of the large-breadth laser selective melting equipment through the motion compensation device, avoids the phenomenon of bending of the conveying hose under extreme conditions, and achieves the purpose of stably and efficiently conveying metal powder to the large-breadth powder laying mechanism on the large-breadth laser selective melting equipment by matching with the conveying hose structure, the powder dropping shunting mechanism in the powder hopper and the powder hopper powder quantity monitoring system.
Drawings
FIG. 1 is a schematic structural diagram of a relay powder falling device suitable for large-format selective laser melting equipment according to the present invention;
FIG. 2 is a schematic structural view of a powder transferring hopper of a powder transferring device of a large-format selective laser melting apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of a relay powder hopper of a relay powder dropping device suitable for a large-format selective laser melting apparatus according to the present invention;
fig. 4 is a schematic structural diagram of a conveying hose of an embodiment 1 of a relay powder dropping device suitable for a large-format selective laser melting device according to the present invention;
fig. 5 is a schematic structural diagram of a conveying hose of an embodiment 2 of a relay powder dropping device suitable for a large-format selective laser melting device according to the present invention;
fig. 6 is a schematic structural diagram of a conveying hose of an embodiment 3 of a relay powder dropping device suitable for a large-format selective laser melting apparatus according to the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:
referring to fig. 1 to 3, the invention relates to a relay powder dropping device suitable for a large-format laser selective melting device, which is connected with a feeding mechanism and a laser forming system and comprises a powder hopper for feeding and a conveying hose 6 for conveying powder. Wherein the powder hopper comprises a transfer powder hopper 4 and a relay powder hopper 7.
The feeding port at the top of the transfer powder hopper 4 is connected with the feeding mechanism 1 through a hose 2 and a hoop 3, and the metal powder arranged in the powder bin outside the forming chamber is sent into the transfer powder hopper 4 by the conveyor. The transferring powder hopper 4 and the feeding mechanism 1 are kept relatively fixed. The powder falling and distributing structure is arranged in the transfer powder hopper 4, so that the powder can be uniformly divided into two parts and flows to the two feed openings. Two feeding ports are correspondingly arranged at the upper part of the relay powder hopper 7, and the metal powder of the relay powder hopper 4 is received through the conveying hose 6. The interior of the relay powder hopper 7 is also provided with a powder falling shunting structure which evenly divides the metal powder fed by the two conveying hoses into four parts and distributes the four parts to the feed opening. The feed opening is connected with four feed openings of the broad width intelligent powder spreading mechanism 9. The relay powder hopper 7 moves along with the intelligent powder spreading mechanism 9. The level indicator and the pneumatic butterfly valve 5 are installed on the hopper body and the feed opening of the transfer powder hopper 4, the level indicator and the pneumatic butterfly valve 8 are installed on the hopper body and the feed opening of the transfer powder hopper 7, and the automatic addition of the powder can be displayed according to the powder.
To further illustrate the motion compensation device between the coupling powder hopper 4 and the relay powder hopper 7 in the present invention, the following description will be made with reference to specific embodiments. Wherein the conveying hose 6 adopts a telescopic hose.
Example 1: telescopic hose and guide sleeve structure
Embodiment 1 adopts a structure as shown in fig. 4, and the structure mainly comprises a flexible hose 10 and a guide sleeve 11. The guide sleeve 11 is sleeved outside the port of the flexible hose 10 and connected with the feeding port of the relay powder hopper, and the inner diameter of the guide sleeve is slightly larger than the maximum outer diameter of the flexible hose 10. The telescopic hose 10 is connected to mainly serve for conveying metal powder, for large-breadth laser selective melting equipment and large-size forming pieces, the length change of the telescopic hose 10 is very large, the telescopic hose 10 is in a continuous telescopic state when reciprocating powder falling is carried out, the impact of the weight of the metal powder on the pipe wall of the telescopic hose 10 in the falling process can cause the stability and the efficiency of the powder falling to be greatly reduced, and even under the extreme condition, the telescopic hose 10 can be bent unpredictably to cause the situation that the powder cannot fall. The guide sleeve 11 is used for weakening fluctuation of the telescopic hose 10 during reciprocating powder falling in the forming process, so that the telescopic hose 10 moves in the range of the guide sleeve 11 to support the telescopic hose 10, and the phenomenon that the telescopic hose 10 is bent unpredictably under extreme conditions is avoided.
Example 2: telescopic hose and external extension spring structure
The structure adopted in embodiment 2 is shown in fig. 5, and the structure mainly includes a flexible hose 12 and an extension spring 13, wherein one end of the extension spring 13 is installed at the discharging opening of the relay powder hopper 4, and the other end is installed at the feeding opening of the relay powder hopper 7. The inner diameter of the pulling spring 13 is slightly larger than the maximum outer diameter of the telescopic hose 12, and the pulling spring is sleeved outside the telescopic hose 12. The function of the pulling spring 13 is also to weaken the fluctuation of the flexible hose 12 during the reciprocating powder dropping in the forming process, and to avoid the unexpected bending phenomenon of the flexible hose 12 in extreme cases.
Example 3: telescopic hose and internal tension spring structure
The structure adopted in embodiment 3 is shown in fig. 6, and the structure mainly includes a flexible hose 14 and an inner tension spring 15, wherein one end of the inner tension spring 15 is installed at the discharging opening of the relay powder hopper, and the other end is installed at the feeding opening of the relay powder hopper 7. The flexible hose is sleeved outside the inner tension spring 15, and the ports at two sides of the flexible hose are respectively connected with the inner tension spring 15. As in embodiments 1 and 2, the inner tension spring 15 disposed inside the bellows 14 also serves to reduce the fluctuation of the bellows 14 during the reciprocal powder dropping during the forming process, thereby avoiding the unpredictable bending of the bellows 14 in extreme cases.
The powder falling shunting mechanism, the powder hopper powder amount monitoring system and the three typical conveying hose 6 in the powder hopper can effectively and uniformly distribute metal powder in the powder bin to the wide powder paving mechanism 9, so that the powder falling and paving precision of the equipment can be improved, and the aim of accurately conveying and paving powder on large-breadth laser selective melting equipment is fulfilled.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a relaying powder device that falls suitable for big breadth laser election district melting equipment, this relaying powder device that falls connects feeding mechanism and laser forming system, includes the conveying hose that is used for the powder hopper of material loading and is used for carrying the material powder, its characterized in that:
the powder hopper comprises a transfer powder hopper and a relay powder hopper, a feeding port of the transfer powder hopper is connected with the feeding mechanism and is kept relatively fixed, two discharging ports are symmetrically arranged at the lower part of the transfer powder hopper, each discharging port is connected with a conveying hose, the conveying hose is connected with the feeding port of the relay powder hopper, a plurality of discharging ports are uniformly arranged at the lower part of the relay powder hopper, each discharging port is connected with a feeding port of the powder spreading mechanism of the laser forming system, and the relay powder hopper moves along with the laser forming system;
each conveying hose is provided with a motion compensation device.
2. The relay powder dropping device suitable for the large-format laser selective melting equipment as claimed in claim 1, wherein the motion compensation device comprises a guide sleeve, the inner diameter of the guide sleeve is slightly larger than the maximum outer diameter of the conveying hose, and the guide sleeve is sleeved outside the port of the conveying hose and connected with the feeding port of the relay powder hopper.
3. The relay powder dropping device suitable for the large-format laser selective melting equipment as claimed in claim 1, wherein the motion compensation device comprises an extension spring, the inner diameter of the extension spring is slightly larger than the maximum outer diameter of the conveying hose, and the extension spring is sleeved on the whole outer side of the conveying hose and is respectively connected with the feeding port of the relay powder hopper and the feeding port of the relay powder hopper.
4. The device as claimed in claim 1, wherein the motion compensation device comprises an inner tension spring, the conveying hose is sleeved outside the inner tension spring, and two side ports of the conveying hose are respectively connected to the inner tension spring.
5. The relay powder dropping device suitable for large-format laser selective melting equipment according to claim 1, wherein the relay powder hopper and the relay powder hopper are both provided with powder dropping shunting mechanisms therein, so that the powder can be uniformly distributed to each feeding port.
6. The relay powder dropping device suitable for the large-format laser selective melting equipment as claimed in claim 1, wherein the powder hopper bodies of the relay powder hopper and the relay powder hopper are provided with material level meters, and the material powder is automatically added by installing a pneumatic butterfly valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318728.9A CN112893877A (en) | 2021-03-25 | 2021-03-25 | Relay powder falling device suitable for large-breadth selective laser melting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318728.9A CN112893877A (en) | 2021-03-25 | 2021-03-25 | Relay powder falling device suitable for large-breadth selective laser melting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112893877A true CN112893877A (en) | 2021-06-04 |
Family
ID=76106429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110318728.9A Pending CN112893877A (en) | 2021-03-25 | 2021-03-25 | Relay powder falling device suitable for large-breadth selective laser melting equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112893877A (en) |
-
2021
- 2021-03-25 CN CN202110318728.9A patent/CN112893877A/en active Pending
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Application publication date: 20210604 |
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| WD01 | Invention patent application deemed withdrawn after publication |