CN206065411U - A kind of built-in automatic coating device based on noble metal 3D printing - Google Patents
A kind of built-in automatic coating device based on noble metal 3D printing Download PDFInfo
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- CN206065411U CN206065411U CN201620679959.7U CN201620679959U CN206065411U CN 206065411 U CN206065411 U CN 206065411U CN 201620679959 U CN201620679959 U CN 201620679959U CN 206065411 U CN206065411 U CN 206065411U
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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
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Abstract
The utility model discloses a kind of built-in automatic coating device based on noble metal 3D printing, including forming room, powdering mechanism, reference water flat board；Powder closing storage box is provided with below the powder outlet of powder box body, is provided between the powder outlet of the powder box body and powder closing storage box and quantitatively send sub-agencies；Four the week side of boss walls of powder closing storage box surround, and form back-shaped structure, and the front-rear side walls at lower openings, along powdering direction are separately installed with two powder coating scrapers；Powder is closed four the week side of boss walls, two powder coating scrapers and the reference water flat board of storage box and constitutes storage powder space；Powder in powder box body, the face on the basis of reference water flat board are back and forth uniformly struck off by powder coating scraper.The device is integrated with the function of quantitatively supplying powder and efficient powdering, during being applied to the 3D printing of noble metal, can effectively improve precious metal material utilization rate, reduce material waste.
Description
Technical field
This utility model is related to the confession powder in metal 3D printer and powdering part, more particularly to a kind of based on noble metal 3D
The built-in automatic coating device for printing.
Background technology
With the fast development of 3D printing technique, the metal 3D printing technique with metal dust as raw material obtains people and gets over
Carry out more attention.The cardinal principle of metal 3D printing technique is, in moulding cylinder successively uniform deposit powder, to calculate
Laser scanning cross section is adopted under the control of machine, the metal powder bond in scanned region is made or is melted so as to obtain molding
The monolayer cross sectional shape of part, then moulding cylinder declines certain altitude and repetition above procedure is until part whole molding is finished.
During molding, powdering mode is to affect one of principal element of formed precision, and whether the size of powdering amount, powdering layer are uniform
It is directly to be determined by powdering mode Deng all, therefore how realizes that quick, effective and accurate powdering is metal current 3D printing neck
A study hotspot in domain.
The more universal powdering mode of application mainly has the modes such as roll type, scraper-type and mobile hopper-type at present.Roller
Formula powdering mode has preferable consolidation effect, but easily causes powdering when defect such as warpage or projection occurs in molding flat
It is uneven；Scraper-type has preferably paves effect, but easily causes the waste of powder, and this is when precious metal accessory is processed
It is very uneconomic；Mobile hopper-type is a kind of compound powdering mode that powder cylinder and power spreading device combine, due to
The powdering mode shortens the stroke of power spreading device, can preferably improve the efficiency of powdering, but cannot equally realize saving
The function of powder.
Therefore during metal 3D printing, particularly with regard to the course of processing of noble metal powder, it is desirable to provide a kind of
Can either realize that uniform ground powdering again can be with quantitatively supplying powder to reduce the power spreading device of waste of material.
The content of the invention
The purpose of this utility model is the shortcoming and defect for overcoming above-mentioned prior art, there is provided one kind can either be realized
Even smooth powdering again can be with quantitatively supplying powder reducing the built-in automatic coating device based on noble metal 3D printing of waste of material.
This utility model is achieved through the following technical solutions：
A kind of built-in automatic coating device based on noble metal 3D printing, including forming room 1, the paving being placed in forming room 1
Powder mechanism, the reference water flat board 2 being placed in forming room 1, the moulding cylinder 4 being placed in below reference water flat board 2；The powdering mechanism includes
Powder box body 6；Powder closing storage box 9, the powder outlet of the powder box body 6 are provided with below the powder outlet of powder box body 6
It is provided between powder closing storage box 9 and quantitatively send sub-agencies；
Four the week side of boss walls of powder closing storage box 9 surround, lower openings, form back-shaped structure, and at lower openings, along paving
The front-rear side walls in powder direction are separately installed with two powder coating scrapers 11；Four the week side of boss walls of powder closing storage box 9, two powder
Coating blade 11 and reference water flat board 2 constitute storage powder space 10；Powder coating scraper 11 is by the powder in powder box body 6
End, the face on the basis of reference water flat board 2, back and forth uniformly strikes off.
Quantitatively send that sub-agencies include continuously or discontinuously rotating it is quantitative quantitatively rotate to powder roller 8 to powder roller 8, control and
The drive mechanism of rotating speed；
Between the quantitative top for being located at powder closing storage box 9 to powder roller 8 and the powder outlet of powder box body 6；Quantitatively
It is in sealing contact to the part-circular periphery surface of powder roller 8 and the powder outlet rotary type of powder box body 6；8 circumference of powder roller is being given quantitatively
Radially go up in surface；It is quantitative to be used to receive powder to powder groove 16；Powder is given quantitatively
With quantitatively rotating to powder roller 8, when quantitatively rotating to powder outlet to powder groove 16, powder is flowed into quantitatively to powder groove 16 groove 16
It is interior, when quantitatively rotating to powder outlet to powder groove 16, quantitatively Chu Fenkong is poured onto to powder entrained in powder groove 16
Between inside 10, realize quantitatively supplying powder.
At the inside powder outlet of powder box body 6, rotatable curved baffle 7 is provided with；Two arcs of curved baffle 7
The powder outlet interior sidewall surface linear contact lay of end face and powder box body 6；When curved baffle 7 two curved ends with powder box body
When 6 powder outlet interior sidewall surface is contacted, powder outlet is closed, wherein in two curved ends of curved baffle 7
When individual end face is not contacted with powder outlet interior sidewall surface, powder outlet is opened；Gone out relative to powder by adjusting curved baffle 7
The aperture of mouth, realizes the control of 6 powder outlet quantity of powder box body.
The quantitative two ends to powder roller 8 are arranged on the top that powder closes storage box 9 by bearing；The drive mechanism bag
Motor 17 and its controller are included, the quantitative rotation to powder roller 8 and rotational speed regulation are realized by controller, the quantitative confession of powder is realized
Should.
The powder outlet of powder box body 6 closes the seam of storage box 9 with powder, using plug-in demountable structure.
The powder outlet of the powder box body 6 goes out with an inner edge 15 for extending internally, and outer wall and the powder of inner edge 15 are sealed
The slot face contact closed at the top of storage box 9.
The curved baffle 7 is connected with a rotary switch 14, and rotary switch 14 is arranged on the side wall of powder box body 6；It is logical
Cross rotation turn switch 14 and realize that curved baffle 7 is rotated in the range of 0 °～90 °, realize the opening of 6 powder outlet of powder box body
Control with closing, and powder outlet quantity size.
The both sides of the moulding cylinder 4 are provided with the Powder Recovery box 3 for recovery excessive powder during powdering；It is described into
Include hoistable platform 12 in type cylinder 4；Forming cavity 13 is offered on reference water flat board 2, forming cavity 13 is corresponding to hoistable platform 12
Top.
A kind of operation method of the built-in automatic coating device based on noble metal 3D printing, including quantitative powder feeding step；
The quantitative powder feeding step：Controller controlled motor 17 is rotated；It is quantitative to powder groove 16 with quantitatively rotating to powder roller 8,
When quantitatively rotating to powder outlet to powder groove 16, powder is flowed under the influence of gravity into quantitatively in powder groove 16, when quantitative
It is when exporting internal rotating to powder outlet by material to powder groove 16, quantitative to powder entrained in powder groove 16, quantitatively giving
Powder groove 16 rotate produce centrifugal force and powder gravity collective effect under, be poured onto by powder close storage box 9 four the week side of boss walls, two
Individual powder coating scraper 11 and reference water flat board 2 are constituted inside storage powder space 10；At the same time, motor is set by controller
The 17 rotation number of turns and velocity of rotation, realize the weight feed of powder.
A kind of operation method of the built-in automatic coating device based on noble metal 3D printing, also scrapes powder step including one：By
The powder of quantitative powder feeding step supply drop to by powder close four the week side of boss walls of storage box 9, two powder coating scrapers 11 and
In the storage powder space 10 constituted by reference water flat board 2, to limit wandering scope of the powder on reference water flat board 2；
Two powder coating scrapers 11 are moved repeatedly with powder closing storage box 9, realize two-way powder laying action；Powder is applied
Layer scraper 11 will store up the powder inside powder space 10, and the face on the basis of reference water flat board 2 is back and forth uniformly struck off in forming surface,
And by laser scanning surface contoured cross-section, complete a powdering action；Often complete a powdering action aftershaping cylinder 4 and decline a spacing
From being moved back and forth until profiled member completion of processing with this.
This utility model is had the following advantages and effect relative to prior art：
This utility model provides solution noble metal 3D printing process in which materials (noble metal powder) of complete set and wastes
The scheme of problem：By motor control with being quantitatively engaged with the powder outlet of powder box body to powder roller to the quantitative of powder groove,
As the quantitative rotating speed to powder roller of control can effectively reduce the waste of precious metal powder powder material with accurate measurement powder-feeding amount.
The powder closing storage box of back-shaped structure, can greatly reduce powder and fall into the airborne dust produced during forming surface, and
In being able to ensure that the powdering course of work be all the time two powder coating scrapers along direction of motion rear carry out it is two-way scrape powder, so
Powder spreading can either be made and the generation of powder phenomenon is played, the storage powder interior volume region of closing is limited in, so as to reducing powder spreading and playing powder
Impact of the phenomenon to the course of processing, this design can greatly reduce the powder pollution in the course of processing in molding room,
The neat and tidy of forming room is ensure that, the precision and quality of profiled member is improve.
The powder closing storage box of back-shaped structure, also overcomes metal dust due to the phenomenon easily wandering with mobility,
Noble metal powder is effectively used so as to reduce the waste of material.
Detachable powder box body has curved baffle due to indoor design so that the process for adding powder and Powder Recovery is fast
It is prompt and facilitate.
Description of the drawings
Fig. 1 is built-in automatic coating device structural representation of this utility model based on noble metal 3D printing.
Fig. 2 is built-in automatic coating device sectional perspective structural representation of this utility model based on noble metal 3D printing.
Partial structurtes enlarged diagrams of the Fig. 3 for Fig. 1.
Specific embodiment
This utility model is more specifically described in detail with reference to specific embodiment.
Embodiment
As shown in Figures 1 to 3.The utility model discloses a kind of built-in automatic coating device based on noble metal 3D printing,
Including forming room 1, the powdering mechanism being placed in forming room 1, the reference water flat board 2 being placed in forming room 1, it is placed in reference water flat board
Moulding cylinder 4 below 2；The powdering mechanism includes powder box body 6；The top of body 6 is provided with powder inlet 5 and (locates in the course of processing
In sealing state)；Powder closing storage box 9 is provided with below the powder outlet of powder box body 6, the powder of the powder box body 6 goes out
It is provided between mouth and powder closing storage box 9 and quantitatively send sub-agencies；
Four the week side of boss walls of powder closing storage box 9 surround, lower openings, form back-shaped structure, and at lower openings, along paving
The front-rear side walls in powder direction are separately installed with two powder coating scrapers 11；Four the week side of boss walls of powder closing storage box 9, two powder
Coating blade 11 and reference water flat board 2 constitute storage powder space 10；Powder coating scraper 11 is by the powder in powder box body 6
End, the face on the basis of reference water flat board 2, back and forth uniformly strikes off.Two powder coating scrapers 11 are detachable connection in powder
On the side wall of closing storage box 9, the function of two-way powder laying is capable of achieving, working (machining) efficiency is greatly improved, powder coating in the course of work
11 base of scraper is maintained an equal level with reference water flat board 2, it is ensured that the molding flat of moulding cylinder is overlapped with reference water flat board 2 all the time.
Quantitatively send that sub-agencies include continuously or discontinuously rotating it is quantitative quantitatively rotate to powder roller 8 to powder roller 8, control and
The drive mechanism (not shown) of rotating speed；
Between the quantitative top for being located at powder closing storage box 9 to powder roller 8 and the powder outlet of powder box body 6；Quantitatively
It is in sealing contact to the part-circular periphery surface of powder roller 8 and the powder outlet rotary type of powder box body 6；8 circumference of powder roller is being given quantitatively
Radially go up in surface；It is quantitative to be used to receive powder to powder groove 16；Powder is given quantitatively
With quantitatively rotating to powder roller 8, when quantitatively rotating to powder outlet to powder groove 16, powder is flowed into quantitatively to powder groove 16 groove 16
It is interior, when quantitatively rotating to powder outlet to powder groove 16, quantitatively Chu Fenkong is poured onto to powder entrained in powder groove 16
Between inside 10, realize the weight feed of powder, on the one hand reduce waste of material, another accurate confession for conveniently solving material
Giving, powder being also inhibits in the powder spreading of storing interior volume and play powder phenomenon, the forming process for workpiece provides good work
Make environment, improve Forming Quality and precision.
At the inside powder outlet of powder box body 6, rotatable curved baffle 7 is provided with；Two arcs of curved baffle 7
The powder outlet interior sidewall surface linear contact lay of end face and powder box body 6；When curved baffle 7 two curved ends with powder box body
When 6 powder outlet interior sidewall surface is contacted, powder outlet is closed, wherein in two curved ends of curved baffle 7
When individual end face is not contacted with powder outlet interior sidewall surface, powder outlet is opened；Gone out relative to powder by adjusting curved baffle 7
The aperture of mouth, realizes the control of 6 powder outlet quantity of powder box body.The cross sectional shape of powder outlet is wedge structure, when making powder down
It is more smooth.
The quantitative two ends to powder roller 8 are arranged on the top that powder closes storage box 9 by bearing；The drive mechanism bag
Motor 17 and its controller are included, the quantitative rotation to powder roller 8 and rotational speed regulation are realized by controller, the quantitative confession of powder is realized
Should.
The powder outlet of powder box body 6 closes the seam of storage box 9 with powder, is detachably tied using inserting (easy socket) formula
Structure.Powder box body 6 closes the docking (including separating) of storage box 9 with powder, can control by artificial docking or by travel mechanism
System.
The powder outlet of the powder box body 6 goes out with an inner edge 15 for extending internally, and outer wall and the powder of inner edge 15 are sealed
The slot face contact closed at the top of storage box 9.
The curved baffle 7 is connected with a rotary switch 14, and rotary switch 14 is arranged on the side wall of powder box body 6；It is logical
Cross rotation turn switch 14 and realize that curved baffle 7 is rotated in the range of 0 °～90 °, realize the opening of 6 powder outlet of powder box body
Control with closing, and powder outlet quantity size.The curved baffle 7 is elastomer, and combines rotatable opening/closing mode, with sealing
The advantages of property is good, laborsaving, easy to adjust.
The both sides of the moulding cylinder 4 are provided with the Powder Recovery box 3 for recovery excessive powder during powdering；It is described into
Include hoistable platform 12 in type cylinder 4；Forming cavity 13 is offered on reference water flat board 2, forming cavity 13 is corresponding to hoistable platform 12
Top.
When powdering operation is started, quantitatively rotate to powder roller 8 and start quantitative powder feeding and/or scrape powder, when stopping for powder,
Powder box body 6 quantitatively stops operating to powder roller 8 after leaving powder box body 6, and quantitative powder feeding process terminates, but scrapes the continuation of powder process,
Until powder is all uniformly struck off in forming surface, and by laser scanning surface contoured cross-section, after completing said process, moulding cylinder
4 decline certain distance, and powder coating scraper (11) is moved back and forth；Repeat above-mentioned quantitative powder feeding and scrape powder process, until profiled member
Completion of processing.
A kind of operation method of the built-in automatic coating device based on noble metal 3D printing, including quantitative powder feeding step and scrape
Powder step；
The quantitative powder feeding step：Controller controlled motor 17 is rotated；It is quantitative to powder groove 16 with quantitatively rotating to powder roller 8,
When quantitatively rotating to powder outlet to powder groove 16, powder is flowed under the influence of gravity into quantitatively in powder groove 16, when quantitative
It is when exporting internal rotating to powder outlet by material to powder groove 16, quantitative to powder entrained in powder groove 16, quantitatively giving
Powder groove 16 rotate produce centrifugal force and powder gravity collective effect under, be poured onto by powder close storage box 9 four the week side of boss walls, two
Individual powder coating scraper 11 and reference water flat board 2 are constituted inside storage powder space 10；At the same time, motor is set by controller
The 17 rotation number of turns and velocity of rotation, realize the weight feed of powder.
It is described to scrape powder step：By quantitative powder feeding step supply powder drop to by powder close storage box 9 four the week side of boss walls,
In the storage powder space 10 constituted by two powder coating scrapers 11 and reference water flat board 2, to limit powder in reference water flat board 2
On wandering scope；Two powder coating scrapers 11 are moved repeatedly with powder closing storage box 9, realize two-way powder laying action；
Powder coating scraper 11 will store up the powder inside powder space 10, and the face on the basis of reference water flat board 2 is back and forth uniformly struck off in molding
On face, and by laser scanning surface contoured cross-section, a powdering action is completed；Often complete a powdering action aftershaping cylinder 4 and decline one
One thickness distance of set a distance, is moved back and forth with this until profiled member completion of processing.The cylinder body both sides of moulding cylinder 4 are provided with powder
Box 3 is used for noble metal powder unnecessary on collection basis horizontal plate 2.
As described above, just can preferably realize this utility model.
Embodiment of the present utility model is simultaneously not restricted to the described embodiments, and other are any without departing from of the present utility model
Spirit and the change, modification, replacement made under principle, combine, simplify, should be equivalent substitute mode, be included in
Within protection domain of the present utility model.
Claims (8)
1. a kind of built-in automatic coating device based on noble metal 3D printing, including forming room (1), it is placed in forming room (1)
Powdering mechanism, the reference water flat board (2) being placed in forming room (1), the moulding cylinder (4) being placed in below reference water flat board (2)；The paving
Powder mechanism includes powder box body (6)；
It is characterized in that：Powder closing storage box (9), the powder box body (6) are provided with below the powder outlet of powder box body (6)
Powder outlet and powder closing storage box (9) between be provided with；
Four the week side of boss walls of powder closing storage box (9) surround, lower openings, form back-shaped structure, and at lower openings, along powdering
The front-rear side walls in direction are separately installed with two powder coating scrapers (11)；Four the week side of boss walls of powder closing storage box (9), two powder
Last coating blade (11) and reference water flat board (2) constitute storage powder space (10)；Powder coating scraper (11) will be from powder box
Powder in body (6), the face on the basis of reference water flat board (2), back and forth uniformly strikes off.
2. built-in automatic coating device according to claim 1 based on noble metal 3D printing, it is characterised in that：Quantitatively send point
Mechanism include continuously or discontinuously rotating it is quantitative to powder roller (8), control it is quantitative rotate to powder roller (8) and rotating speed driving machine
Structure；
Between quantitative top and the powder outlet of powder box body (6) of storage box (9) being closed positioned at powder to powder roller (8)；It is fixed
Measure in sealing contact with the powder outlet rotary type of powder box body (6) to the part-circular periphery surface of powder roller (8)；Powder roller is being given quantitatively
(8) circumferential surface is radially gone up；Powder groove (16) is given quantitatively for receiving powder
End；Quantitatively rotate to powder roller (8) with quantitative to powder groove (16), when quantitatively rotating to powder outlet to powder groove (16), powder
The later and decadent stage of a school of thought enters quantitatively in powder groove (16), when quantitatively rotating to powder outlet to powder groove (16), quantitatively in powder groove (16)
Entrained powder is poured onto storage powder space (10) inside, realizes quantitatively supplying powder.
3. built-in automatic coating device according to claim 1 based on noble metal 3D printing, it is characterised in that：In powder box
At the inside powder outlet of body (6), rotatable curved baffle (7) is provided with；Two curved ends of curved baffle (7) and powder
The powder outlet interior sidewall surface linear contact lay of body (6)；When curved baffle (7) two curved ends with powder box body (6)
Powder outlet interior sidewall surface contact when, powder outlet is closed, wherein in two curved ends of curved baffle (7)
When individual end face is not contacted with powder outlet interior sidewall surface, powder outlet is opened；By adjusting curved baffle (7) relative to powder
The aperture of outlet, realizes the control of powder box body (6) powder outlet quantity.
4. built-in automatic coating device according to claim 2 based on noble metal 3D printing, it is characterised in that：It is described quantitative
The top that powder closes storage box (9) is arranged on by bearing to the two ends of powder roller (8)；The drive mechanism include motor (17) and
Its controller, realizes the quantitative rotation to powder roller (8) and rotational speed regulation by controller, realizes the rationing of powder.
5. the built-in automatic coating device according to claim 1 or 3 based on noble metal 3D printing, it is characterised in that：Powder
The powder outlet of box body (6) closes the seam of storage box (9) with powder, using plug-in demountable structure.
6. the built-in automatic coating device according to claim 1 or 3 based on noble metal 3D printing, it is characterised in that：It is described
The powder outlet of powder box body (6) goes out with an inner edge (15) for extending internally, and outer wall and the powder of inner edge (15) close storage box
(9) the slot face contact at the top of.
7. built-in automatic coating device according to claim 3 based on noble metal 3D printing, it is characterised in that：The arc
Baffle plate (7) is connected with a rotary switch (14), and rotary switch (14) is arranged on the side wall of powder box body (6)；By rotating rotation
Turn on pass (14) and realize that curved baffle (7) is rotated in the range of 0 °～90 °, realize the opening of powder box body (6) powder outlet with
Close, and the control of powder outlet quantity size.
8. built-in automatic coating device according to claim 1 based on noble metal 3D printing, it is characterised in that：The molding
The both sides of cylinder (4) are provided with the Powder Recovery box (3) for recovery excessive powder during powdering；Bag in the moulding cylinder (4)
Include hoistable platform (12)；Forming cavity (13) is offered on reference water flat board (2), forming cavity (13) is corresponding to hoistable platform (12)
Top.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620679959.7U CN206065411U (en) | 2016-06-28 | 2016-06-28 | A kind of built-in automatic coating device based on noble metal 3D printing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620679959.7U CN206065411U (en) | 2016-06-28 | 2016-06-28 | A kind of built-in automatic coating device based on noble metal 3D printing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105903966A (en) * | 2016-06-28 | 2016-08-31 | 华南理工大学 | Internally-arranged automatic coating device and method based on 3D printing of precious metal |
| CN107855526A (en) * | 2017-12-20 | 2018-03-30 | 韶关学院 | A kind of powder quantitative feeder for selective laser fusing 3D printing |
| CN109421267A (en) * | 2017-09-04 | 2019-03-05 | 东台精机股份有限公司 | The 3 D-printing device and its operating method of dust recycling |
| CN111702178A (en) * | 2020-07-29 | 2020-09-25 | 天津清研智束科技有限公司 | Powder paving device and additive manufacturing device |
| CN113665106A (en) * | 2021-09-23 | 2021-11-19 | 重庆理工大学 | Bidirectional powder-spreading 3D printing method |
-
2016
- 2016-06-28 CN CN201620679959.7U patent/CN206065411U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105903966A (en) * | 2016-06-28 | 2016-08-31 | 华南理工大学 | Internally-arranged automatic coating device and method based on 3D printing of precious metal |
| CN105903966B (en) * | 2016-06-28 | 2019-01-29 | 华南理工大学 | A kind of built-in automatic coating device and method based on noble metal 3D printing |
| CN109421267A (en) * | 2017-09-04 | 2019-03-05 | 东台精机股份有限公司 | The 3 D-printing device and its operating method of dust recycling |
| CN107855526A (en) * | 2017-12-20 | 2018-03-30 | 韶关学院 | A kind of powder quantitative feeder for selective laser fusing 3D printing |
| CN107855526B (en) * | 2017-12-20 | 2023-08-15 | 韶关学院 | Powder quantitative supply device for laser selective melting 3D printing |
| CN111702178A (en) * | 2020-07-29 | 2020-09-25 | 天津清研智束科技有限公司 | Powder paving device and additive manufacturing device |
| CN113665106A (en) * | 2021-09-23 | 2021-11-19 | 重庆理工大学 | Bidirectional powder-spreading 3D printing method |
| CN113665106B (en) * | 2021-09-23 | 2023-07-07 | 重庆理工大学 | Bidirectional powder laying 3D printing method |
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