CN108437456A - A kind of arrangement apparatus and implementation for fiber-wall-element model in selective laser sintering powdering - Google Patents
A kind of arrangement apparatus and implementation for fiber-wall-element model in selective laser sintering powdering Download PDFInfo
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- CN108437456A CN108437456A CN201810412199.7A CN201810412199A CN108437456A CN 108437456 A CN108437456 A CN 108437456A CN 201810412199 A CN201810412199 A CN 201810412199A CN 108437456 A CN108437456 A CN 108437456A
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- 238000000227 grinding Methods 0.000 title claims abstract description 28
- 238000000110 selective laser sintering Methods 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 11
- 229910002114 biscuit porcelain Inorganic materials 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- MOVRNJGDXREIBM-UHFFFAOYSA-N aid-1 Chemical compound O=C1NC(=O)C(C)=CN1C1OC(COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)CO)C(O)C1 MOVRNJGDXREIBM-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/188—Processes of additive manufacturing involving additional operations performed on the added layers, e.g. smoothing, grinding or thickness control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of arrangement apparatus and implementation for fiber-wall-element model in selective laser sintering powdering, it is characterised in that including powdering roller, funnel device and is orientated holder；Powdering roller and funnel device are respectively placed in workbench both sides, and funnel device bottom is provided with guide groove, are orientated holder and are mounted in the guide groove of funnel device bottom.Its implementation is：Powdering roller is laid with one layer of powder on working face, then pass through the collective effect of funnel device and orientation holder, the fiber of regular array is laid on the bisque laid, after one layer of sintering, powdering again, then change the angle being orientated between rack cross-bar and vertical pole, be laid with fiber again, and constantly repeat the above process.The configuration of the present invention is simple, with in the prior art compared with mixing unordered fiber in being sintered powder, it is of the invention can effective control fiber arrange according to design direction in sample sinter layer, the problem of effective solution current fiber composite dusty material sintered specimen anisotropy.
Description
Technical field
The invention belongs to selective laser sintering fields, more particularly to a kind of for fiber in selective laser sintering powdering
The arrangement apparatus and implementation of orientation.
Background technology
Selective laser sintering（Selective Laser Sintering, abbreviation SLS）Be be widely used at present it is fast
Fast forming technique, moulding process principle are：The electronic 3-D model of target part is initially set up, then with delamination software pair
Threedimensional model carries out slice segmentation, and computer controls laser beam according to slice plane data information to preheated heat-fusible powder
Powder material successively scans sintering, until the scanning forming until completing last cross-sectional layers finishes.The technology has manufacturing process simple
The features such as list, degree of flexibility is high, and material selection range is wide, utilization rate is high, at low cost, and shaping speed is fast, by increasingly wider
General attention.
The selection of SLS technologies is relatively broad at present, including：High molecular material, metal, ceramic powders, precoated sand etc..With application
For widest nylon powder material, after laser sintered, the intensity of molded part is relatively low, and main cause is that its quality is dredged
Pine, density are relatively low.To improve the intensity of molded part, researcher improves molding using the reinforcements such as linear fiber are added in powder
The intensity of part.But the prior art and method still cannot the effectively orientation arrangement of control fiber material in the powder, and then show
There is anisotropy in the mechanical property of product, it is further in selective laser sintering to limit fibre reinforced materials
Using.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of arrangement for fiber-wall-element model in selective laser sintering powdering
Device and implementation.
Patent of the present invention is the technical solution adopted is that a kind of arrangement for fiber-wall-element model in selective laser sintering powdering
Device, it is characterised in that including powdering roller, funnel device and be orientated holder；The powdering roller is distinguished with the funnel device
The both sides of workbench are installed on, the holder that is orientated is mounted on the guide groove of the funnel device；
In the above-mentioned arrangement apparatus for fiber-wall-element model in selective laser sintering powdering, the funnel device（7）Bottom is set
It is equipped with guide groove（72）, the guide groove（72）Top is provided with opening-closing plate（71）, and guide groove（72）Both sides offer slot hole, are orientated
Holder（9）It is mounted on guide groove across slot hole（72）Side wall on；
The opening-closing plate（71）On be provided with multiple rectangular openings；
The rectangular opening is closed controllably, and rectangle hole length is more than the maximum length of fiber, and width is more than the maximum gauge of fiber；
The orientation holder（9）It is made of, is connected by revolute pair between cross bar and vertical pole, and structure more cross bars and two vertical poles
At parallelogram mechanism；Minimum range when work between adjacent two cross bar is more than the maximum gauge of fiber, and maximum distance is small
In the minimum length of fiber,
The angle of cross bar can be in -45 ° ~ 45 ° ranges in the orientation holder；
The radical of the cross bar is according to guide groove（72）Length determine, specifically include an active cross bar（92）With more driven cross
Bar（94）, active cross bar（92）One end and worm gear mechanism（10）It is connected；The vertical pole includes a fixed vertical pole（93）
With a movable vertical pole（91）, fixed vertical pole（93）It is fixed on funnel device（7）On, movable vertical pole（91）Remain at guide groove
（72）It is external；
The guide groove（72）Outer wall is provided with vibrator（8）；
The vibrator（8）And worm gear mechanism（10）It is separately mounted to guide groove both sides external；
The worm gear mechanism（10）Including worm gear（101）, worm screw（102）And worm gear shaft（103）, worm gear（101）With worm gear
Axis（103）Between connected by spline, worm gear shaft（103）With active cross bar（92）One end be connected, worm gear shaft（103）With fixation
Vertical pole（93）One end connected by cylindrical pair.
A kind of implementation for fiber-wall-element model in selective laser sintering powdering is as follows：
（a）In powder feeding cylinder（5）In preset dusty material（4）, funnel device（7）In preset fiber（12）；
（b）Powdering roller（3）In working face（13）One layer of bisque of upper laying, subsequent direction of adjustment holder（9）Extremely required angle,
Vibration on Start-up device（8）, pass through funnel device（7）With orientation holder（9）Collective effect, laid out on the bisque laid with
It is orientated holder（9）The parallel fiber in cross bar direction, and carry out laser sintered；
（c）Powdering again, and pass through motor（11）Drive funnel device（7）The worm gear mechanism of side（10）It drives and is orientated branch
Frame（9）Active cross bar（92）Rotation changes and is orientated holder（9）Angle between middle cross bar and vertical pole is laid with another on bisque
The fiber in direction, it is in different directions ordered arrangement that the fiber on powder bed will be sintered by, which realizing, carries out next layer of sintering；
（d）Constantly repeat the above steps（c）, until all sinter layers are completed to be sintered, finally obtain sintered specimen.
Description of the drawings
Fig. 1 is apparatus of the present invention implementation process schematic diagram；
Fig. 2 is the structural schematic diagram of apparatus of the present invention；
Fig. 3 is the cross section view of Fig. 2；
Fig. 4 is partial enlarged view at the A of Fig. 2；
Fig. 5 is the vertical view of apparatus of the present invention（Orientation holder is concealed in figure）；
Fig. 6 is to be orientated supporting structure schematic diagram；
Fig. 7 is partial enlarged view at the B of Fig. 6；
In figure：1- laser aids, 2- laser beams, 3- powdering rollers, 4- dusty materials, 5- powder supply cylinders, 6- working cylinders, 7- funnels dress
It setting, 71- opening-closing plates, 72- guide grooves, 8- vibrators, 9- orientation holders, 91- activity vertical poles, 92- active cross bars, 93- fixes vertical pole,
The driven cross bars of 94-, 10- worm gear mechanisms, 101- worm gears, 102- worm screws, 103- worm gear shafts, 11- motors, 12- fibers, 13-
Working face.
Specific implementation mode
Referring to Fig. 1, the arrangement apparatus for fiber-wall-element model in selective laser sintering powdering disclosed by the invention is main
It is made of powdering roller 3, funnel device 7, vibrator 8, orientation holder 9, worm gear mechanism 10 and motor 11.
Referring to Fig. 1 ~ 7, the implementation for fiber-wall-element model in selective laser sintering powdering of the invention, specifically such as
Under：
（1）Dusty material 4 is preset in powder feeding cylinder 5, working cylinder 6 declines certain distance, and powder feeding cylinder 5 rises certain distance, powdering
Roller 3 is laid with one layer of dusty material 4 on working face 13；
（2）7 guide groove of the funnel device, 72 top is provided with opening-closing plate 71, and the rectangular opening being arranged on opening-closing plate 71 is closed controllably,
Vibrator 8 is provided with outside the guide groove 72；Before work, the rectangular opening on opening-closing plate 71 is closed, is inserted into funnel device 7 fine
Dimension 12 when work, drives the driving of worm gear mechanism 10 to be orientated holder 9 and moves to required angle, then open by motor 11
Rectangular opening on opening-closing plate 71, Vibration on Start-up device 8, fiber 12 can be by the rectangular opening on opening-closing plate 71 through being orientated holder 9 at this time
It is fallen on after orientation on working face 13, the fiber vibration being orientated on holder 9 can will be got lodged in working face by the vibration of vibrator 8
On 13, funnel device 7 moves back and forth on the bisque laid in advance, is laid on bisque and is orientated cross bar direction in holder 9
Parallel fibrous layer.Then the laser beam 2 sent out using laser aid 1 on working face 13 bisque and fibrous layer carry out the
One layer of scanning sintering；
（3）Described be orientated between the vertical pole and cross bar of holder 9 is connected by revolute pair, is orientated fixation vertical pole 93 and the leakage of holder 9
Bucket device 7 is connected, and one end of active cross bar 92 is connected with the worm gear shaft 103 of worm gear mechanism 10, one end of fixed vertical pole 93
It is connect by cylindrical pair with the worm gear shaft 103 of worm gear mechanism 10, worm gear shaft 103 can drive the master for being orientated holder 9 when rotating
Dynamic cross bar 92 rotates, and then other cross bars is driven to rotate, and changes the angle being orientated between the cross bar and vertical pole of holder 9；
（4）The worm gear 101 of the worm gear mechanism 10 is connect with worm gear shaft 103 by spline pair, worm screw 102 and motor 11
Main shaft connects, and powder feeding cylinder 5 rises certain distance again, and moulding cylinder 6 declines certain distance, powdering roller 3 on working face 13 again
One layer of powder of secondary laying, the active cross bar 92 that then motor 11 drives worm gear mechanism 10 to drive orientation holder 9 rotate centainly
Angle, and then change the angle for being orientated all cross bars in holder 9, it is then laid with the fiber parallel with cross bar direction at this time again,
It is in different directions ordered arrangement that the fiber on powder bed will be sintered by, which realizing, carries out next layer of sintering；
（5）Constantly repeat the above steps（4）, until all sinter layers are completed to be sintered, finally obtain sintered specimen.
Claims (3)
1. a kind of arrangement apparatus for fiber-wall-element model in selective laser sintering powdering, it is characterised in that including powdering roller
（3）, funnel device（7）With orientation holder（9）；The powdering roller（3）With the funnel device（7）It is respectively arranged in workbench
Both sides, the orientation holder（9）Mounted on the funnel device（7）On；
The funnel device（7）Bottom is provided with guide groove（72）, the guide groove（72）Top is provided with opening-closing plate（71）, and guide groove
（72）Both sides offer slot hole, are orientated holder（9）It is mounted on guide groove across slot hole（72）Side wall on；
The opening-closing plate（71）On be provided with multiple rectangular openings；
The rectangular opening is closed controllably, and rectangle hole length is more than the maximum length of fiber, and width is more than the maximum gauge of fiber；
The orientation holder（9）It is made of, is connected by revolute pair between cross bar and vertical pole, and structure more cross bars and two vertical poles
At parallelogram mechanism；Minimum range when work between adjacent two cross bar is more than the maximum gauge of fiber, and maximum distance is small
In the minimum length of fiber；
The radical of the cross bar is according to guide groove（72）Length determine, specifically include an active cross bar（92）With more driven cross
Bar（94）, active cross bar（92）One end and worm gear mechanism（10）It is connected；The vertical pole includes a fixed vertical pole（93）
With a movable vertical pole（91）, fixed vertical pole（93）It is fixed on funnel device（7）On, movable vertical pole（91）Remain at guide groove
（72）It is external；
The guide groove（72）Outer wall is provided with vibrator（8）；
The vibrator（8）And worm gear mechanism（10）It is separately mounted to guide groove both sides external；
The worm gear mechanism（10）Including worm gear（101）, worm screw（102）And worm gear shaft（103）, worm gear（101）With worm gear
Axis（103）Between connected by spline, worm gear shaft（103）With active cross bar（92）One end be connected, worm gear shaft（103）With fixation
Vertical pole（93）One end connected by cylindrical pair.
2. a kind of implementation for fiber-wall-element model in selective laser sintering powdering is as follows：
（a）In powder feeding cylinder（5）In preset dusty material（4）, funnel device（7）In preset fiber（12）；
（b）Powdering roller（3）In working face（13）One layer of bisque of upper laying, subsequent direction of adjustment holder（9）Extremely required angle,
Vibration on Start-up device（8）, pass through funnel device（7）With orientation holder（9）Collective effect, laid out on the bisque laid with
It is orientated holder（9）The parallel fiber in cross bar direction, and carry out laser sintered；
（c）Powdering again, and pass through motor（11）Drive funnel device（7）The worm gear mechanism of side（10）It drives and is orientated branch
Frame（9）Active cross bar（92）Rotation changes and is orientated holder（9）Angle between middle cross bar and vertical pole is laid with another on bisque
The fiber in direction, it is in different directions ordered arrangement that the fiber on powder bed will be sintered by, which realizing, carries out next layer of sintering；
（d）Constantly repeat the above steps（c）, until all sinter layers are completed to be sintered, finally obtain sintered specimen.
3. implementation according to claim 2, it is characterized in that the angle for being orientated cross bar in holder can -45 ° ~
45 ° of ranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810412199.7A CN108437456B (en) | 2018-05-03 | 2018-05-03 | Arrangement device for fiber orientation in selective laser sintering powder laying and implementation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810412199.7A CN108437456B (en) | 2018-05-03 | 2018-05-03 | Arrangement device for fiber orientation in selective laser sintering powder laying and implementation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108437456A true CN108437456A (en) | 2018-08-24 |
| CN108437456B CN108437456B (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810412199.7A Expired - Fee Related CN108437456B (en) | 2018-05-03 | 2018-05-03 | Arrangement device for fiber orientation in selective laser sintering powder laying and implementation method |
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| Country | Link |
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| CN (1) | CN108437456B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109605741A (en) * | 2018-11-21 | 2019-04-12 | 湘潭大学 | A kind of selective laser sintering device and method carrying out carbon fiber oriented alignment using gasified pattern |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7794647B1 (en) * | 2006-03-23 | 2010-09-14 | Carl Deckard | Method of selective laser sintering with improved materials |
| CN203004330U (en) * | 2012-12-13 | 2013-06-19 | 余金文 | Fiber implanting device |
| CN203752535U (en) * | 2014-03-17 | 2014-08-06 | 余金文 | Fiber implantation device for selective laser sintering (SLS) |
| US20170266863A1 (en) * | 2016-03-17 | 2017-09-21 | Fuji Xerox Co., Ltd. | Additive manufacturing apparatus and additive manufacturing method |
| CN107756786A (en) * | 2017-10-24 | 2018-03-06 | 湘潭大学 | The device and method of ultrasound control fiber architecture in a kind of precinct laser sintering |
| WO2018048540A1 (en) * | 2016-09-06 | 2018-03-15 | Cc3D Llc | Additive manufacturing system having in-head fiber weaving |
-
2018
- 2018-05-03 CN CN201810412199.7A patent/CN108437456B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7794647B1 (en) * | 2006-03-23 | 2010-09-14 | Carl Deckard | Method of selective laser sintering with improved materials |
| CN203004330U (en) * | 2012-12-13 | 2013-06-19 | 余金文 | Fiber implanting device |
| CN203752535U (en) * | 2014-03-17 | 2014-08-06 | 余金文 | Fiber implantation device for selective laser sintering (SLS) |
| US20170266863A1 (en) * | 2016-03-17 | 2017-09-21 | Fuji Xerox Co., Ltd. | Additive manufacturing apparatus and additive manufacturing method |
| WO2018048540A1 (en) * | 2016-09-06 | 2018-03-15 | Cc3D Llc | Additive manufacturing system having in-head fiber weaving |
| CN107756786A (en) * | 2017-10-24 | 2018-03-06 | 湘潭大学 | The device and method of ultrasound control fiber architecture in a kind of precinct laser sintering |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109605741A (en) * | 2018-11-21 | 2019-04-12 | 湘潭大学 | A kind of selective laser sintering device and method carrying out carbon fiber oriented alignment using gasified pattern |
| CN109605741B (en) * | 2018-11-21 | 2020-09-08 | 湘潭大学 | Selective laser sintering device and method for carrying out carbon fiber directional arrangement by using gasification die |
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| CN108437456B (en) | 2020-02-28 |
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