CN203635913U - Powder spreading device of SLM equipment - Google Patents
Powder spreading device of SLM equipment Download PDFInfo
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- CN203635913U CN203635913U CN201320811347.5U CN201320811347U CN203635913U CN 203635913 U CN203635913 U CN 203635913U CN 201320811347 U CN201320811347 U CN 201320811347U CN 203635913 U CN203635913 U CN 203635913U
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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 powder spreading device of SLM equipment. The powder spreading device comprises a powder spreading body, an auxiliary guide rail linear motor and an auxiliary powder spreading guide rail. The auxiliary guide rail linear motor drives the powder spreading body to slide on the auxiliary powder spreading guide rail. The interior of the powder spreading body is divided into three sections, the three sections are the cylindrical section, the circular arc section and the conical section from top to bottom respectively, the cylindrical section is a powder loading region, a powder inlet is formed between the cylindrical section and the circular arc section, a powder supply roller is arranged on the circular arc section, a plurality of dovetail grooves are evenly formed in the powder supply roller, the outer circle of the powder supply roller is tangential to a circular arc on the upper portion of the circular arc section, and the powder supply roller is driven by a servo drive motor to rotate. A powder scraping device is arranged on the conical section, a powder outlet is formed in the bottom of the conical section, the upper end of the powder scraping device is tangential to the outer circle of the powder supply roller, the lower end of the powder scraping device stretches out of the powder outlet, and gaps are reserved between the lower end of the powder scraping device and the two ends of the powder outlet. The powder scraping device comprises a flexible powder scraping brush. The powder spreading device can quantitatively supply powder, reduce waste of powder, spread powder in a two-way mode, shorten time of the SLM forming auxiliary process, and improve SLM forming efficiency.
Description
Technical field
The utility model relates to increasing material and manufactures research field, particularly a kind of laser selective melting SLM equipment power spreading device.
Background technology
The technology such as laser, precision drive, new material, CAD/CAM that laser selective melting SLM is integrated, by the meticulous Laser Focusing hot spot of 30～80 microns, by selection area on the new paving of line overlap joint scanning bisque, after forming surface profile, layer is piled up moulding manufacture with layer, thereby directly obtain arbitrary shape almost, have the metal function part of complete metallurgical binding, density can reach and be close to 100%.Complex three-dimensional solid is reduced to two dimensional surface manufacture by SLM, and manufacturing cost does not depend on the complexity of part, but depend on volume and the forming direction of part.
SLM is as the important way of direct manufacture metal function part, its advantage is mainly manifested in: (1) adopts layering manufacturing technology, profiled member is not subject to the impact of geometry complexity, can directly manufacture any complicated metal parts, easily manufactured for personalized small lot complex product; (2) optical fiber laser of use high power density, beam mode is good, and laser facula is little, and formed precision is higher; (3) directly make terminal metal product, because laser energy density is higher, can directly be processed into terminal metal product to the high difficult processing metal of fusing point; (4) metal parts is the entity with metallurgical binding, and its relative density almost reaches 100%, and performance exceedes conventional cast part.
But existing laser selective melting SLM equipment middle berth powder is unidirectional paving powder, need to come back to paving powder original position, elapsed time is longer, simultaneously in paving powder process, few for powder amount of powder, can cause spreading powder front and back inhomogeneous, many for powder amount of powder, can require to preset to shaped material demand increases, and scrape powder and adopt silica gel, very easily loss, exerts an influence to follow-up paving powder, therefore, seeking a kind of quantitatively powder feeding, two-way powder laying, flexibility scrapes the power spreading device of powder and has important researching value.
Utility model content
Main purpose of the present utility model is that the shortcoming that overcomes prior art is with not enough, a kind of laser selective melting SLM equipment power spreading device is provided, this device can be realized quantitative powder feeding, two-way powder laying, flexibility are scraped powder, thereby saving powder supplies, shorten the half paving powder time, and paving powder process there is good repair to technique unstability.
The purpose of this utility model realizes by following technical scheme: a kind of laser selective melting SLM equipment power spreading device, comprise paving powder main body, auxiliary guide rail linear electric motors and auxiliary paving powder guided way, be provided with auxiliary paving powder guided way in the both sides of moulding cylinder, paving powder main body two ends are arranged on auxiliary paving powder guided way by slide block respectively, and auxiliary guide rail linear electric motors are used for driving paving powder main body to slide on auxiliary paving powder guided way; Described power spreading device also comprises servo drive motor and is arranged on confession powder rod, the powder-scraping device of paving powder body interior, paving powder body interior is divided into 3 sections, be respectively from top to bottom cylindrical section, arc section and conical section, cylindrical section Wei Zaifen district, between cylindrical section and arc section, be provided with powder inlet, arc section is provided with for powder rod, for being evenly provided with several dovetail grooves on powder rod, tangent for powder rod cylindrical and arc section top circular arc, for the rotation under servo drive motor drives of powder rod; Conical section is provided with powder-scraping device, and conical section bottom is meal outlet, and powder-scraping device upper end is with tangent for powder rod cylindrical, and meal outlet is stretched out in lower end, all leaves gap with meal outlet two ends.Thereby can ensure that for powder rod cylindrical and arc section top circular arc are tangent dovetail groove rotates for powder rod time, only take away the powder quantitatively identical with dovetail groove volume, can realize quantitative powder feeding, driven by servo drive motor for powder rod, the variation turning to along with servo drive motor can realize two-way powder laying simultaneously.
Preferably, described powder-scraping device comprises that clamping plate bracing or strutting arrangement, rigidity clamping plate and flexibility are scraped and whitewashes, and flexibility is scraped to whitewash and is clipped in rigidity clamping plate, and rigidity clamping plate are fixed on clamping plate bracing or strutting arrangement end.Can realize flexibility and scrape powder by adopting flexibility to scrape to whitewash, making to spread in powder process to have good repair to technique unstability.
Further, described flexibility is scraped to whitewash by several steel discs and is formed, and each steel plate thickness is at 0.03-1mm, and bottom scribing has sawtooth, intersects stacking placement in rigidity clamping plate, and the height that steel disc exposes rigidity clamping plate is the height of rigidity clamping plate to moulding datum plane.
Further, the steel disc of described flexibility in scraping and whitewashing is screwed in rigidity clamping plate, and rigidity clamping plate are T-shaped, are inserted in clamping plate bracing or strutting arrangement.
Preferably, the excessive powder that described power spreading device two ends are also provided with for reclaiming unnecessary powder reclaims hangers case.
Preferably, in described Zai Fen district, be provided with the sensor for detection of amount of powder.
A kind of paving powder method based on above-mentioned power spreading device, comprise step: paving powder main body is slided on auxiliary paving powder guided way, servo drive motor drives for powder rod and starts to rotate, rotation direction is consistent with paving powder main body moving direction, powder in Zai Fen district falls into in the dovetail groove on powder rod by powder inlet, powder in dovetail groove is after the arc section rotation in paving powder main body, powder flows out from the gap of powder-scraping device and meal outlet, and the flexibility of powder-scraping device end is scraped to whitewash in reach process powder is carried out to uniform spreading.
Preferably, for powder amount number determine according to the load volume of the rotating speed of servo drive motor, wall scroll dovetail groove, for the quantity of dovetail groove on powder rod, determine that according to turning to of servo drive motor powder scrapes from flexibility that the left side of whitewashing goes out or right side goes out.Guarantee powder always flows out in flexibility scrapes the front of whitewashing direct of travel.
Preferably, described Zai Fen is provided with the sensor for detection of amount of powder in district, and sensor is connected with peripheral control unit, and Zai Fen district is connected with outside upper powder device, when in sensor detects Zai Fen district, amount of powder is lower than certain value, powder in powder device Dui Zaifen district in controller control.
Preferably, the described rotating speed for powder rod arranges according to SLM moulding bed thickness.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the utility model can be realized quantitatively supplying powder by adopting with the powder rod that supplies of dovetail groove, reduces powder waste.
2, being driven by servo drive motor for powder rod in the utility model, can change powder emission direction by changing turning to of servo drive motor, therefore has two-way powder laying function, shortens the SLM moulding auxiliary process time, improves SLM shaping efficiency.
3, the utility model adopts flexibility to scrape and whitewashes powder is carried out to uniform spreading in paving powder main body reach process, and making to spread powder process has good repair to technique unstability.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model device;
Fig. 2 is the structural representation of the utility model device middle berth powder main body;
Fig. 3 is the flexible structural representation of scraping the steel disc in whitewashing in the utility model device.
Wherein: 1-paving powder main body; 2-moulding cylinder; The excessive powder of 3-reclaims hangers case; 4-Zai Fen district; The auxiliary paving of 5-powder guided way; 6-auxiliary guide rail linear electric motors; 7-attachment screw; 8-servo drive motor; 9-is for powder rod; 10-servo drive motor transmitter shaft; 11-rigidity clamping plate; 12-clamping plate bracing or strutting arrangement; 13-flexibility is scraped and is whitewashed; 14-powder inlet; 15-meal outlet; 16-dovetail groove; 17-sawtooth.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1
A kind of laser selective melting SLM equipment power spreading device is a kind of device of laying new one deck powder for SLM forming process, the present embodiment structure as illustrated in fig. 1 and 2, comprise that paving powder main body 1, auxiliary guide rail linear electric motors 6, auxiliary paving powder guided way 5 and excessive powder reclaim hangers case 3, be provided with auxiliary paving powder guided way 5 in the both sides of moulding cylinder 2, the excessive powder that the two ends that are also power spreading devices at the two ends of moulding cylinder 2 are respectively arranged with for reclaiming unnecessary powder reclaims hangers case 3.Paving powder main body 1 two ends are fixed on the slide block on auxiliary paving powder guided way 5 by attachment screw 7.Auxiliary guide rail linear electric motors 6 are for driving paving powder main body 1 to slide on auxiliary paving powder guided way 5.
As shown in Figure 2, described power spreading device also comprises servo drive motor 8 and is arranged on confession powder rod 9, the powder-scraping device of paving powder main body 1 inside, paving powder main body 1 inside is divided into 3 sections, be respectively from top to bottom cylindrical section, arc section and conical section, cylindrical section Wei Zaifen district 4, between cylindrical section and arc section, be provided with powder inlet 14, arc section is provided with for powder rod 9, for being evenly provided with several dovetail grooves 16 on powder rod 9, tangent for powder rod 9 cylindricals and arc section top circular arc, be connected with the transmitter shaft of servo drive motor 8 for powder rod 9, rotation under servo drive motor 8 drives; Conical section is provided with powder-scraping device, and conical section bottom is meal outlet 15, and powder-scraping device upper end is with tangent for powder rod 9 cylindricals, and meal outlet is stretched out in lower end, all leaves gap with meal outlet two ends.Described powder-scraping device comprises that clamping plate bracing or strutting arrangement 12, rigidity clamping plate 11 and flexibility are scraped and whitewashes 13, and flexibility is scraped and whitewashed 13 and be clipped in rigidity clamping plate 11, and rigidity clamping plate 11 are fixed on clamping plate bracing or strutting arrangement 12 ends.
Flexibility in the present embodiment is scraped and is whitewashed 13 and be made up of several steel discs, the structure of each steel disc as shown in Figure 3, thickness is at 0.05-1mm, bottom scribing has sawtooth 17, in rigidity clamping plate 11, intersect stacking placement according to sawtooth, the height that steel disc exposes rigidity clamping plate is the height of rigidity clamping plate to moulding datum plane.
Paving powder main body and slide block in the present embodiment power spreading device are separable, after separation, this paving powder main body 1 are shifted out to SLM forming room, can facilitate the flexible replacing of whitewashing of scraping.Scrape while whitewashing changing flexibility, powder-scraping device is taken off with the screw that paving powder main body is connected, T-shaped rigidity clamping plate are extracted out from clamping plate bracing or strutting arrangement, by T-shaped rigidity clamping plate separately, 2～6 thin layer steel discs of bottom scribing sawtooth are intersected to pile and be stacked and placed between two rigidity clamping plate, adjust the height that thin layer steel disc exposes, highly for rigidity clamping plate are to the height of moulding datum plane.Rigidity clamping plate are tightened, insert in clamping plate bracing or strutting arrangement, clamping plate bracing or strutting arrangement is fixed in paving powder main body, then paving powder main body is relocated on the slide block on auxiliary paving powder guided way.
Operation starts, and by upper powder device, power spreading device is supplied to powder, and powder is stored in power spreading device Zai Fen district, there is the sensor of amount of powder of detection in Zai Fen district, and sensor is connected with peripheral control unit, and Dang Zaifen district amount of powder is during lower than certain value, controller sends signal to upper powder device, powder in Dui Zaifen district.When Zai Fen district amount of powder enough meets lower two-layer paving powder, paving powder main body is under auxiliary guide rail linear electric motors drive, move with certain speed, servo drive motor drives for powder rod and starts to rotate simultaneously, rotation direction is consistent with paving powder main body moving direction, and the rotating speed for powder rod arranges according to SLM moulding bed thickness, now carry full powder for the dovetail groove of powder rod top end, tangent for powder rod cylindrical and arc section top circular arc, be that dovetail groove coordinates for the arc-shaped gaps that is greater than dovetail groove width between upper right side, powder rod upper left side and rigid beam, ensure that dovetail groove carries powder inexcessive, in the time rotating for powder rod, only take away the powder quantitatively identical with dovetail groove volume, powder flows out, put the front of scraping the direct of travel whitewashing with power spreading device flexibility, flexibility is scraped and is whitewashed in reach process powder uniform spreading, until cover whole forming area completely.Unnecessary powder is reclaimed hangers case and is reclaimed by the both sides powder that overflows, and now 1 layer of powder paving powder completes.Laser instrument is opened, and laser beam is formulated graph scanning at forming area face according to central industrial computer by light path system.
After having scanned, power spreading device starts back and moves.When back moves, for the return motion under servo drive motor drives of powder rod, now quantitative powder flows out through the opposite side of power spreading device, is placed in flexibility and scrapes the direct of travel front of whitewashing, and is scraped to whitewash it is sprawled by flexibility.Until cover whole forming area completely, power spreading device completes return second layer paving powder, and laser beam scans forming area.
The beginning step that so reruns completes lower two-layer paving powder and moulding.
In use, for powder amount number be according to the load volume of the rotating speed of servo drive motor, wall scroll dovetail groove, decide for the quantity of dovetail groove on powder rod.
This device has reduced the redundancy step of power spreading device in paving powder process, paving powder back and forth direction all spread powder, and middle flexibility is scraped and is whitewashed the uniformity and the planarization that ensure that powder is sprawled, and while there is the little warpage of regional area in moulding process generation fluctuation forming part, flexibility is scraped to whitewash and can be passed through smoothly this region, and this region spreads less powder or does not spread powder according to warpage situation, and unstability is had to good repair.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.
Claims (6)
1. a laser selective melting SLM equipment power spreading device, comprise paving powder main body, auxiliary guide rail linear electric motors and auxiliary paving powder guided way, be provided with auxiliary paving powder guided way in the both sides of moulding cylinder, paving powder main body two ends are arranged on auxiliary paving powder guided way by slide block respectively, and auxiliary guide rail linear electric motors are used for driving paving powder main body to slide on auxiliary paving powder guided way; It is characterized in that, described power spreading device also comprises servo drive motor and is arranged on confession powder rod, the powder-scraping device of paving powder body interior, paving powder body interior is divided into 3 sections, be respectively from top to bottom cylindrical section, arc section and conical section, cylindrical section Wei Zaifen district, is provided with powder inlet between cylindrical section and arc section, arc section is provided with for powder rod, for being evenly provided with several dovetail grooves on powder rod, tangent for powder rod cylindrical and arc section top circular arc, for the rotation under servo drive motor drives of powder rod; Conical section is provided with powder-scraping device, and conical section bottom is meal outlet, and powder-scraping device upper end is with tangent for powder rod cylindrical, and meal outlet is stretched out in lower end, all leaves gap with meal outlet two ends.
2. laser selective melting SLM equipment power spreading device according to claim 1, it is characterized in that, described powder-scraping device comprises that clamping plate bracing or strutting arrangement, rigidity clamping plate and flexibility are scraped and whitewashes, and flexibility is scraped to whitewash and is clipped in rigidity clamping plate, and rigidity clamping plate are fixed on clamping plate bracing or strutting arrangement end.
3. laser selective melting SLM equipment power spreading device according to claim 2, it is characterized in that, described flexibility is scraped to whitewash by several steel discs and is formed, each steel plate thickness is at 0.03-1mm, bottom scribing has sawtooth, in rigidity clamping plate, intersect stacking placement, the height that steel disc exposes rigidity clamping plate is the height of rigidity clamping plate to moulding datum plane.
4. laser selective melting SLM equipment power spreading device according to claim 3, is characterized in that, the steel disc of described flexibility in scraping and whitewashing is screwed in rigidity clamping plate, and rigidity clamping plate are T-shaped, are inserted in clamping plate bracing or strutting arrangement.
5. laser selective melting SLM equipment power spreading device according to claim 1, is characterized in that, the excessive powder that described power spreading device two ends are also provided with for reclaiming unnecessary powder reclaims hangers case.
6. laser selective melting SLM equipment power spreading device according to claim 1, is characterized in that, described Zai Fen is provided with the sensor for detection of amount of powder in district.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320811347.5U CN203635913U (en) | 2013-12-10 | 2013-12-10 | Powder spreading device of SLM equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320811347.5U CN203635913U (en) | 2013-12-10 | 2013-12-10 | Powder spreading device of SLM equipment |
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| CN203635913U true CN203635913U (en) | 2014-06-11 |
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| CN201320811347.5U Withdrawn - After Issue CN203635913U (en) | 2013-12-10 | 2013-12-10 | Powder spreading device of SLM equipment |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103691947A (en) * | 2013-12-10 | 2014-04-02 | 华南理工大学 | Powder spreading device and powder spreading method for selective laser melting (SLM) equipment |
| CN105522149A (en) * | 2014-10-21 | 2016-04-27 | 株式会社沙迪克 | Lamination molding apparatus |
| CN105904732A (en) * | 2016-05-26 | 2016-08-31 | 湘潭大学 | Guiding device and implementation method for fiber orientation in selective laser sintering of fiber composite powder |
| CN106312068A (en) * | 2016-10-26 | 2017-01-11 | 华南理工大学 | Mechanical contact-type bidirectional switching powder laying system based on powder bed |
| CN106694881A (en) * | 2017-01-19 | 2017-05-24 | 西安铂力特激光成形技术有限公司 | Single-scraper bi-directional powder laying device, additive manufacturing equipment and powder laying method |
| CN108015278A (en) * | 2017-11-24 | 2018-05-11 | 浙江大学 | A kind of rotary power spreading device of 3 D-printing device and its guide vane |
| CN108080639A (en) * | 2018-01-30 | 2018-05-29 | 宁波蓝野医疗器械有限公司 | Melt rapidly pre-warming power spreading device in a kind of selective laser |
| CN108145968A (en) * | 2017-12-08 | 2018-06-12 | 中国兵器装备研究院 | A kind of list scraper two-way powder laying device |
| CN108436082A (en) * | 2014-06-20 | 2018-08-24 | 维洛3D公司 | Equipment, system and method for 3 D-printing |
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| US10661341B2 (en) | 2016-11-07 | 2020-05-26 | Velo3D, Inc. | Gas flow in three-dimensional printing |
| US10688722B2 (en) | 2015-12-10 | 2020-06-23 | Velo3D, Inc. | Skillful three-dimensional printing |
| CN112140541A (en) * | 2020-09-15 | 2020-12-29 | 杭州德迪智能科技有限公司 | Powder supply and spreading system, forming equipment and powder supply and spreading method |
| US10888925B2 (en) | 2017-03-02 | 2021-01-12 | Velo3D, Inc. | Three-dimensional printing of three-dimensional objects |
| US11691343B2 (en) | 2016-06-29 | 2023-07-04 | Velo3D, Inc. | Three-dimensional printing and three-dimensional printers |
| US11999110B2 (en) | 2019-07-26 | 2024-06-04 | Velo3D, Inc. | Quality assurance in formation of three-dimensional objects |
| US12070907B2 (en) | 2016-09-30 | 2024-08-27 | Velo3D | Three-dimensional objects and their formation |
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2013
- 2013-12-10 CN CN201320811347.5U patent/CN203635913U/en not_active Withdrawn - After Issue
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| CN103691947B (en) * | 2013-12-10 | 2015-10-28 | 华南理工大学 | A kind of selective laser fusing SLM equipment power spreading device and paving powder method |
| CN103691947A (en) * | 2013-12-10 | 2014-04-02 | 华南理工大学 | Powder spreading device and powder spreading method for selective laser melting (SLM) equipment |
| CN108436082A (en) * | 2014-06-20 | 2018-08-24 | 维洛3D公司 | Equipment, system and method for 3 D-printing |
| US10507549B2 (en) | 2014-06-20 | 2019-12-17 | Velo3D, Inc. | Apparatuses, systems and methods for three-dimensional printing |
| US10493564B2 (en) | 2014-06-20 | 2019-12-03 | Velo3D, Inc. | Apparatuses, systems and methods for three-dimensional printing |
| CN105522149A (en) * | 2014-10-21 | 2016-04-27 | 株式会社沙迪克 | Lamination molding apparatus |
| CN105522149B (en) * | 2014-10-21 | 2018-04-20 | 株式会社沙迪克 | Laminated forming device |
| US10688722B2 (en) | 2015-12-10 | 2020-06-23 | Velo3D, Inc. | Skillful three-dimensional printing |
| CN105904732B (en) * | 2016-05-26 | 2017-12-05 | 湘潭大学 | A kind of guider and implementation for being used for fiber-wall-element model in fiber composite powder selective laser sintering |
| CN105904732A (en) * | 2016-05-26 | 2016-08-31 | 湘潭大学 | Guiding device and implementation method for fiber orientation in selective laser sintering of fiber composite powder |
| US11691343B2 (en) | 2016-06-29 | 2023-07-04 | Velo3D, Inc. | Three-dimensional printing and three-dimensional printers |
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| US10661341B2 (en) | 2016-11-07 | 2020-05-26 | Velo3D, Inc. | Gas flow in three-dimensional printing |
| US10611092B2 (en) | 2017-01-05 | 2020-04-07 | Velo3D, Inc. | Optics in three-dimensional printing |
| CN106694881B (en) * | 2017-01-19 | 2019-02-12 | 西安铂力特增材技术股份有限公司 | Single scraper two-way powder laying device, increasing material manufacturing equipment and powdering method |
| CN106694881A (en) * | 2017-01-19 | 2017-05-24 | 西安铂力特激光成形技术有限公司 | Single-scraper bi-directional powder laying device, additive manufacturing equipment and powder laying method |
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| CN108015278B (en) * | 2017-11-24 | 2019-05-17 | 浙江大学 | A kind of 3 D-printing device and its rotary power spreading device of guide vane |
| CN108015278A (en) * | 2017-11-24 | 2018-05-11 | 浙江大学 | A kind of rotary power spreading device of 3 D-printing device and its guide vane |
| CN108145968A (en) * | 2017-12-08 | 2018-06-12 | 中国兵器装备研究院 | A kind of list scraper two-way powder laying device |
| CN108080639A (en) * | 2018-01-30 | 2018-05-29 | 宁波蓝野医疗器械有限公司 | Melt rapidly pre-warming power spreading device in a kind of selective laser |
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| CN112140541A (en) * | 2020-09-15 | 2020-12-29 | 杭州德迪智能科技有限公司 | Powder supply and spreading system, forming equipment and powder supply and spreading method |
| CN112140541B (en) * | 2020-09-15 | 2022-11-25 | 杭州德迪智能科技有限公司 | Powder supply and spreading system, forming equipment and powder supply and spreading method |
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