CN112388974A - Detection equipment and detection method for powder flowability and spreading characteristic - Google Patents
Detection equipment and detection method for powder flowability and spreading characteristic Download PDFInfo
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- CN112388974A CN112388974A CN202011090079.3A CN202011090079A CN112388974A CN 112388974 A CN112388974 A CN 112388974A CN 202011090079 A CN202011090079 A CN 202011090079A CN 112388974 A CN112388974 A CN 112388974A
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- 239000000843 powder Substances 0.000 title claims abstract description 194
- 230000007480 spreading Effects 0.000 title claims abstract description 44
- 238000003892 spreading Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 239000000758 substrate Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 239000000654 additive Substances 0.000 abstract description 15
- 230000000996 additive effect Effects 0.000 abstract description 15
- 238000012512 characterization method Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000007639 printing Methods 0.000 description 4
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 239000002861 polymer material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- 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
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- 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
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- 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
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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- 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
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- 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
-
- 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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
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- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
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Abstract
The invention discloses a device and a method for detecting powder flowability and spreading characteristics. The detection equipment comprises a rack, a powder spreading device and a detection device. The frame includes an upper work platform. The powder spreading device comprises a powder feeding cylinder, a forming cylinder and a scraper mechanism; the powder feeding base plate is arranged at the bottom of the powder feeding cylinder and can move up and down in the forming cylinder; the cylinder bottom of the molding cylinder is a molding substrate; the scraper mechanism moves horizontally, and the scraper mechanism, the powder feeding cylinder and the forming cylinder are matched to scrape powder in the powder feeding cylinder into the forming cylinder and on the forming substrate through the horizontal movement of the scraper mechanism to realize powder paving. The detection device comprises a video camera, a camera and a weighing sensor, wherein the video camera tracks and records the flowing form of powder in the powder laying process, the camera shoots a powder layer on a forming substrate, and the weighing sensor acquires the weight value of the powder layer. It has the following advantages: the method can be directly used for characterization of the fluidity and the spreading characteristic of the additive manufacturing powder.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a device and a method for detecting powder flowability and powder spreading process result quality (spreading characteristic) based on powder bed additive manufacturing.
Background
The powder bed-based additive manufacturing technology is widely popularized and applied additive manufacturing technology, materials are important material bases for additive manufacturing technology development, and the development determines whether additive manufacturing can be widely applied. The additive manufacturing powder material mainly comprises a metal material, a polymer material, a ceramic material, a composite material and the like. In the additive manufacturing powder laying process stage, the laying of a smooth and uniform and high-density powder bed is the premise of forming a formed part with excellent performance. The better the powder flowability, the better the spreading characteristics, and the powder flowability depends on the powder physical parameters and environmental influences.
The characterization method for the flowability of the currently applied powder comprises the following steps: angle of repose, outflow rate method, Hausner index method, Carr fluidity index method, shearing method, and the like. The angle of repose and outflow rate methods are applicable to free flowing powders, which are difficult to flow through the small holes of the flow meter due to adhesion of the additive manufacturing powder and friction of the powder against the wall surface, and therefore, the above characterization methods are not applicable to flow characterization of the additive manufacturing powder. The FT4 powder rheometer and the REVOLUTION powder Analyzer from Mercury Scientific can characterize the flowability of powders under dynamic conditions. However, the flow behavior of a powder depends to a large extent on its particle properties and external loading conditions. The above-described characterization methods are not based on thin powder layer spreading processes, which makes them difficult to accurately describe additive manufacturing powder flow properties. The spreadability of the powder is an important index, which is related to but different from the flowability of the powder, so that the market demands an apparatus and a method for detecting the flowability of the powder and its spreading characteristics in additive manufacturing.
Disclosure of Invention
The invention provides a device and a method for detecting powder flowability and spreading characteristics, which overcome the defects in the background technology.
One of the technical schemes adopted by the invention for solving the technical problems is as follows: powder mobility and spreading characteristic's check out test set includes:
a frame including an upper working platform, the upper working platform being horizontally arranged;
the powder spreading device comprises a powder feeding cylinder, a forming cylinder, a scraper mechanism, a first driving device and a second driving device; the first driving device is in transmission connection with the powder feeding base plate so as to drive the powder feeding base plate to move up and down in the forming cylinder; the cylinder bottom of the molding cylinder is a molding substrate; the second driving device is connected with the scraper mechanism in a transmission manner so as to drive the scraper mechanism to move horizontally, the scraper mechanism, the powder feeding cylinder and the forming cylinder are matched, and powder in the powder feeding cylinder is scraped into the forming cylinder and is scraped on the forming substrate through the horizontal movement of the scraper mechanism so as to realize powder spreading to form a powder layer; and
the detection device comprises a camera, a camera and a weighing sensor, wherein the camera and the scraper mechanism are fixedly arranged together to track and record the flowing form of powder in the powder laying process, the camera is arranged on the machine frame and shoots the powder layer on the forming substrate downwards, and the weighing sensor is arranged on the machine frame and is arranged under the forming substrate to obtain the weight value of the powder layer.
In one embodiment: the powder feeding cylinder and the forming cylinder are horizontally arranged side by side, and the scraper mechanism comprises a scraper which is positioned above the powder feeding cylinder and the forming cylinder.
In one embodiment: the powder feeding cylinder and the forming cylinder are arranged in a flush manner.
In one embodiment: the scraper mechanism also comprises a scraper frame, the scraper frame can be horizontally connected to the rack in a sliding manner, and the scraper is fixedly arranged on the scraper frame; the camera and the scraper frame are fixedly arranged together; the first driving device comprises a first driver and a feed screw and nut mechanism, and the feed screw and nut mechanism is in transmission connection with the first driver and the scraper frame.
In one embodiment: the second driving device comprises a second driver and a lifting rod mechanism, and the lifting rod mechanism is in transmission connection with the second driver and the powder feeding substrate.
In one embodiment: the detection device further comprises a control system, and the control system is connected with the first driving device, the second driving device, the video camera, the camera and the weighing sensor.
In one embodiment: this frame still includes work platform and roof-rack down, should go up work platform, work platform and roof-rack relatively fixed down, should go up work platform and work platform down the horizontal interval fixed down, this roof-rack has the connecting rod that is located above the work platform, and this weighing sensor sets firmly on work platform down, and this camera sets firmly on the connecting rod.
The second technical scheme adopted by the invention for solving the technical problems is as follows: the detection method of the detection equipment for the powder flowability and the spreading characteristic comprises the following steps:
and 4, finishing the scraping action by the scraper mechanism, shooting a powder layer on the formed substrate by the camera and processing shot data, and obtaining the weight value of the powder layer by the weighing sensor and obtaining the density of the powder layer according to the weight value.
Compared with the background technology, the technical scheme has the following advantages:
the avalanche angle in the powder paving process can represent the flowing property of the powder; the camera shoots a powder layer on the forming substrate and can obtain the coverage rate according to the shot data, the weighing sensor can obtain the weight value of the powder layer and can obtain the density of the powder layer according to the weight value, and the coverage rate and the density of the powder layer can represent the spreading performance of the powder; the characterization method can be directly used for characterization of flowability and spreading characteristics of additive manufacturing powder, and has the advantages of reasonable design, simple structure, time saving, material waste reduction, capability of replacing expensive printing equipment to verify the printing material in the early stage, reduction of high-volume equipment loss, suitability of characterization parameters for additive manufacturing requirements and the like.
Drawings
The invention is further described with reference to the following figures and detailed description.
Fig. 1 is a schematic perspective view of the detection apparatus of the present embodiment.
Fig. 2 is a schematic front view of the detection apparatus of the present embodiment.
Figure 3 is a schematic avalanche angle diagram for this embodiment.
Fig. 4 is a process diagram of the powder layer coverage processing of the present embodiment.
Detailed Description
Referring to fig. 1 and 2, the apparatus for detecting powder flowability and spreading characteristics includes a frame 12, wherein the frame 12 is provided with a powder spreading device for spreading powder and a detection device for measuring powder flowability and spreading characteristics.
The frame 12 comprises an upper working platform 9, a lower working platform 11 and a top frame which are relatively fixed, wherein the upper working platform 9 and the lower working platform 11 are parallel and are arranged in parallel with the horizontal plane; the upper working platform 9 and the lower working platform 11 are fixed horizontally at intervals up and down, and the top frame is provided with a connecting rod 7 positioned above the upper working platform 9.
The powder spreading device comprises a powder feeding cylinder 15, a forming cylinder 17, a scraper mechanism, a first driving device and a second driving device; the powder feeding base plate 4 is arranged at the bottom of the powder feeding cylinder 15, the first driving device is in transmission connection with the powder feeding base plate 4 so as to drive the powder feeding base plate 4 to move up and down in the forming cylinder 15, and the opening of the powder feeding cylinder 15 is arranged upwards; the bottom of the forming cylinder 17 is a forming substrate 8, and the opening of the forming cylinder 17 is arranged upwards; this second drive arrangement transmission is connected scraper mechanism and is in order to drive scraper mechanism horizontal migration, and this scraper mechanism, powder feeding cylinder 15 and shaping jar 17 cooperation are scraped the powder in powder feeding cylinder 15 to shaping jar 17 in and are strickleed off realization shop powder on shaping base plate 8 through scraper mechanism horizontal migration. The powder feeding cylinder 15 and the forming cylinder 17 are horizontally arranged side by side on the upper working platform 9, and the powder feeding cylinder 15 and the forming cylinder 17 are arranged flush. In the concrete structure: the scraper mechanism comprises a scraper 5 and a scraper frame 3, the scraper frame 3 can be horizontally connected on a machine frame 12 in a sliding mode, the scraper 5 is fixedly arranged on the scraper frame 3, the scraper 5 is positioned on a powder feeding cylinder 15 and a forming cylinder 17, the first driving device comprises a first driver 2 and a screw nut mechanism 1, the screw nut mechanism 1 is in transmission connection with the first driver 2 and the scraper frame 3, and the first driver is a servo motor; the second driving device includes a second driver 13 and a lifting rod mechanism 14, the lifting rod mechanism 14 is in transmission connection with the second driver 13 and the powder feeding substrate 4, and the second driver is a servo motor.
The detection device comprises a miniature video camera 6, an industrial camera 16 and a load cell, such as an electronic balance scale 10; the micro camera 6 and the scraper frame 3 are fixedly arranged together and are positioned on the left side of the forming substrate 8 for moving together with the scraper so as to track and record the flowing form of powder in the powder spreading process on the forming substrate 8; the industrial camera 16 is arranged on the connecting rod 7 and shoots the powder layer on the forming substrate 8 downwards, and the shooting range of the industrial camera is the whole forming substrate and is horizontally parallel to the forming substrate; the electronic balance 10 is mounted on the lower working platform 11 and is disposed under the forming substrate 8 to obtain the weight value of the powder layer.
The detection device further comprises a control system, such as a PLC, connected to the first driver, the second driver, the video camera, the camera and the weighing sensor.
The detection method of the detection equipment for the powder flowability and the spreading characteristic comprises the following steps:
step 4, the scraper mechanism completes the scraping action to form a powder layer, the camera shoots the powder layer on the forming substrate, the shot image is transmitted into the computer and processed, the coverage rate of the powder layer on the forming substrate 8 can be measured and calculated, and finally the coverage rate of the powder layer paved on the forming substrate 8 is obtained,
coverage rate C ═ S1/S2)*100％，S1For powder coverage of the area of the shaped substrate in the selected area, S2Is the area of the selected region;
the weighing sensor obtains the weight value of the powder layer, records the display reading on the electronic scale 10, reads the powder spreading weight of the powder layer, obtains the density of the powder layer according to the height difference between the scraper and the forming substrate 8 and the powder spreading weight,
powder bed Density PlayerM/(a × b × h), m being the laypowder weight, a being the forming cylinder (forming baseplate) length, b being the forming cylinder (forming baseplate) width, h being the predetermined powder layer thickness (height);
wherein: the flow property of the powder is characterized mainly through an avalanche angle in the powder spreading process, the spreading property of the powder is characterized through the coverage rate and the powder layer density, the flow property of the powder can be directly evaluated, the time is saved, the material waste is reduced, the expensive printing equipment can be replaced to perform early-stage verification on the printing material, the high-cost equipment loss is reduced, and the characterization parameters are suitable for the material increase manufacturing requirement.
The image of step 4 is processed, for example: the method comprises the following steps that an industrial camera shoots a powder layer on a forming substrate of the industrial camera, the collected picture is guided into Labview software, and the powder coverage rate is obtained through a Labview program, wherein the obtaining comprises the following specific steps: firstly, opening Labview software and a developed program; secondly, importing a photo, and carrying out gray processing on the photo through an edited program; then, carrying out secondary processing, namely binaryzation on the grayed picture; a proper threshold value is selected to distinguish the laid powder layer from the background (a forming substrate), so that a binary image is obtained; finally, reading the binarized image information, and converting the binarized image information into powder layer coverage; as shown in fig. 4, the image processing procedure is as follows: image capture-graying-binarization.
The present invention will be described in detail below with reference to the accompanying drawings by taking the performance test of the alumina spherical powder as an example. Putting the spherical alumina powder to be detected into a powder feeding cylinder 15; the powder spreading thickness and the advancing speed of the scraper 5 are adjusted through a control panel of the PLC; the second driving device drives the powder feeding substrate to ascend the powder; the scraper 5 scrapes the powder on the powder feeding substrate 4 onto the forming substrate 8, and when the scraper 5 carries out the powder laying process, the miniature camera 6 arranged on the left side of the scraper can track and record the change of a powder layer on the forming substrate 8 in the powder laying process; processing and analyzing the image through related software of a computer to obtain an avalanche angle in the powder paving process; after the powder spreading operation is completed, the industrial camera 16 photographs the molded substrate 8, and the coverage rate of the powder layer on the molded substrate 8 can be obtained through related software. After the powder spreading device finishes one-time powder spreading, the display reading on the electronic scale 10 is recorded so as to read the powder spreading weight of the powder, and after data processing of a computer, the obtained avalanche angle, the powder layer coverage rate and the powder layer density are all displayed on a display of a control system.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (8)
1. Powder mobility and spreading characteristic's check out test set, its characterized in that: the method comprises the following steps:
a frame including an upper working platform, the upper working platform being horizontally arranged;
the powder spreading device comprises a powder feeding cylinder, a forming cylinder, a scraper mechanism, a first driving device and a second driving device; the first driving device is in transmission connection with the powder feeding base plate so as to drive the powder feeding base plate to move up and down in the forming cylinder; the cylinder bottom of the molding cylinder is a molding substrate; the second driving device is connected with the scraper mechanism in a transmission manner so as to drive the scraper mechanism to move horizontally, the scraper mechanism, the powder feeding cylinder and the forming cylinder are matched, and powder in the powder feeding cylinder is scraped into the forming cylinder and is scraped on the forming substrate through the horizontal movement of the scraper mechanism so as to realize powder spreading to form a powder layer; and
the detection device comprises a camera, a camera and a weighing sensor, wherein the camera and the scraper mechanism are fixedly arranged together to track and record the flowing form of powder in the powder laying process, the camera is arranged on the machine frame and shoots the powder layer on the forming substrate downwards, and the weighing sensor is arranged on the machine frame and is arranged under the forming substrate to obtain the weight value of the powder layer.
2. The apparatus for detecting powder flowability and spreading characteristic according to claim 1, wherein: the powder feeding cylinder and the forming cylinder are horizontally arranged side by side, and the scraper mechanism comprises a scraper which is positioned above the powder feeding cylinder and the forming cylinder.
3. The apparatus for detecting powder flowability and spreading characteristic according to claim 2, wherein: the powder feeding cylinder and the forming cylinder are arranged in a flush manner.
4. The apparatus for detecting powder flowability and spreading characteristic according to claim 2, wherein: the scraper mechanism also comprises a scraper frame, the scraper frame can be horizontally connected to the rack in a sliding manner, and the scraper is fixedly arranged on the scraper frame; the camera and the scraper frame are fixedly arranged together; the first driving device comprises a first driver and a feed screw and nut mechanism, and the feed screw and nut mechanism is in transmission connection with the first driver and the scraper frame.
5. The apparatus for detecting powder flowability and spreading characteristic according to claim 1, wherein: the second driving device comprises a second driver and a lifting rod mechanism, and the lifting rod mechanism is in transmission connection with the second driver and the powder feeding substrate.
6. The apparatus for detecting powder flowability and spreading characteristic according to claim 1, wherein: the detection device further comprises a control system, and the control system is connected with the first driving device, the second driving device, the video camera, the camera and the weighing sensor.
7. The apparatus for detecting powder flowability and spreading characteristic according to claim 1, wherein: this frame still includes work platform and roof-rack down, should go up work platform, work platform and roof-rack relatively fixed down, should go up work platform and work platform down the horizontal interval fixed down, this roof-rack has the connecting rod that is located above the work platform, and this weighing sensor sets firmly on work platform down, and this camera sets firmly on the connecting rod.
8. The method for detecting the powder flowability and spreading characteristic detecting equipment according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
step 1, filling powder in a powder feeding cylinder;
step 2, the second driving device drives the powder feeding substrate to rise to a specified height so as to push out the powder;
step 3, horizontally moving the scraper mechanism to scrape the powder in the powder feeding cylinder into the forming cylinder and to scrape the powder on the forming substrate, and acquiring the avalanche angle of the powder pile in front of the scraper mechanism in real time by a camera in the horizontal moving process of the scraper mechanism, wherein the smaller the avalanche angle is, the better the flowability of the powder is;
and 4, finishing the scraping action by the scraper mechanism, shooting a powder layer on the formed substrate by the camera and processing shot data, and obtaining the weight value of the powder layer by the weighing sensor and obtaining the density of the powder layer according to the weight value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116441570A (en) * | 2023-04-23 | 2023-07-18 | 晶高优材(北京)科技有限公司 | Device and method for evaluating powder paving quality of additive manufacturing powder |
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