CN106903315A - A kind of 3D printing equipment and Method of printing - Google Patents
A kind of 3D printing equipment and Method of printing Download PDFInfo
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- CN106903315A CN106903315A CN201710316420.4A CN201710316420A CN106903315A CN 106903315 A CN106903315 A CN 106903315A CN 201710316420 A CN201710316420 A CN 201710316420A CN 106903315 A CN106903315 A CN 106903315A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/90—Means for process control, e.g. cameras or sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
Abstract
The present invention relates to a kind of 3D printing equipment and Method of printing.The 3D printing equipment includes the housing of sealing, and power spreading device is provided with the housing, and surface figure measuring device is provided with around the power spreading device；Also include data processing equipment, for processing the data that surface figure measuring device is obtained, obtain the characterization parameter of powder bed surface irregularity degree, and compare with setting value；Also include data feedback device, for receiving the data processed result of data processing equipment and data processed result being fed back into operating personnel；The feedback device is electrically connected with data processing equipment.3D printing equipment of the invention and Method of printing can realize the real-time monitoring to the flatness of powdering layer during printing, facilitate operating personnel carries out Reasonable adjustment to printing technological parameter, the uneven caused product defects of powdering is avoided, and then increases substantially the performance of product.
Description
Technical field
The invention belongs to 3D printing technique field, and in particular to a kind of 3D printing equipment and Method of printing.
Background technology
3D printing technique is one kind of rapid shaping technique, and it is a kind of based on threedimensional model, with metal dust
Or plastics etc. can jointing material, by successively scanning, the mode of stacking constructs the technology of stereoscopic three-dimensional part layer by layer.Should
Technology combines all kinds of subjects such as CAD/CAM, optics, numerical control and material science, application field widely, jewelry, medical treatment,
Footwear, industrial design, building, Aero-Space, automobile, education etc. have application prospect.
Currently for metal material 3D printing technique, SLM is prevailing technology, and SLM technologies are grown up on the basis of SLS
, the general principle of the two is similar to.SLM technologies need to be completely melt metal dust, straight forming metalwork, it is therefore desirable to high
Before power density laser device laser beam starts scanning, horizontal powder-laying roller first tiles metal dust onto the substrate of Processing Room, so
The powder that laser beam will optionally be melted on substrate by the profile information of current layer afterwards, processes the profile of current layer, then
Liftable system declines a distance for figure layer thickness, rolls powder-laying roller again in manufactured current layer upper berth metal dust,
Equipment is called in next figure layer and is processed, and is so processed layer by layer, until whole part completion of processing.
During SLM increasing material manufacturings, powdering process is the critical process of increasing material manufacturing technique.Metal powder material can
Spreading property is to printing technology and its important.But the performance detection to increasing material manufacturing metal dust remains in tradition at present
Parameter detecting level, characterized using the detection means of conventional powder material, the degree of accuracy is not high, often results in and actually prints
The quality of product do not reach anticipation standard.
Applicant has found in research process, and in the print procedure of product, each layer of surface topography of powder is to printing
The performance impact of product is huge, and uneven, the defect caused during a certain layer powdering can cause a product defects, and defect can be entered
One step causes the influence such as stress concentration, and then the performance of product is greatly lowered.And during existing 3D printing equipment operation, when certain
When defect occurs in one layer of powdering, due to powdering layer quality condition cannot be judged, printing is typically may proceed to, influence the property of product
Energy.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art, there is provided it is smooth that one kind can monitor print procedure middle berth bisque
The 3D printing equipment and Method of printing of degree situation, to improve printing quality of item, the printing that realization more becomes more meticulous.
The technical scheme is that：A kind of 3D printing equipment Method of printing, comprises the following steps：
（1）One layer of powder of paving, obtains powder bed；
（2）With surface figure measuring device to step（1）In powder bed characterized, obtain powder bed surface irregularity degree
Characterization parameter H；
（3）Characterization parameter H is compared with setting range value；
（4）When characterization parameter H meets the requirement of setting range value, printed；When parameter H exceeds setting range value, stop
Printing, and feedback information.
Further, feedback information can feed back to operating personnel, and operating personnel take further remedy as needed
Measure or adjusting parameter are printed again.Operating system can also be fed back to, operating system can be according to predetermined treatment
Mode is continued with.
Further, the characterization parameter H of described surface irregularity degree is the parameter that can characterize out-of-flatness degree size,
Preferably characterize height, depth, the parameter of volume, such as its maximum, average, variance.
Further, described characterization parameter H is the highest point height H at powder bed surface irregularitymaxWith lowest part depth
Degree HminAbsolute value, or, described characterization parameter H is the cumulative volume at powder bed surface irregularity, or, described table
Levy the volume that parameter H is maximum single convex/concave.
Wherein, the first scheme of the characterization parameter H of described irregularity degree is：
By conventional high-resolution ratio range finding device（Such as laser ranging system, optical fiber distance measuring device）, laser measuring device for measuring is located at
The surface of measurement point position, the N number of site in powdering storehouse surface after measurement powdering, measures its phase that face is crossed relative to the knife edge of scraper
To the absolute value of height.Wherein, the absolute value of relative altitude is the characterization parameter H of surface irregularity degree.Accordingly, operating personnel
Suitable setting range value can according to actual needs be set, it is considered that, the absolute value of relative altitude is too high, corresponding position lack
Sunken volume is bigger, can leave defect herein if continuing to print, and influences quality.Operating personnel can according to actual needs,
One suitable value range of setting, such as 0~H0（Comprising end points）, when H is less than H0When, then the size for showing defect herein is can
With what is received, it is also acceptable to cause the defect size in product, continues to print.Conversely, stopping printing, and feed back.
Wherein, the second scheme of the characterization parameter H of described irregularity degree is：
By conventional high-resolution ratio range finding device（Such as laser ranging system, optical fiber distance measuring device）, such as laser measuring device for measuring position
In the N number of site in powdering storehouse surface behind the surface of measurement point position, measurement powdering, N number of point position is measured relative to Laser emission plane
Height H1, H2...HN, it is calculated H1, H2...HNAverage value HA, calculate | H1-HA| ..., | HN-HA|, and calculated
The maximum of the volume of data for going out is set to characterization parameter H.Equally, operating personnel can set a conjunction according to actual needs
Suitable value range, such as 0~H0（Comprising end points）, when H is less than H0When, then the size for showing defect herein can be receiving, make
It is also acceptable into the defect size in product, continues to print.Conversely, stopping printing, and feed back.
Wherein, the third scheme of the characterization parameter H of described irregularity degree is：
By conventional high-resolution ratio range finding device（Such as laser ranging system, optical fiber distance measuring device）, such as laser measuring device for measuring position
In the N number of site in powdering storehouse surface behind the surface of measurement point position, measurement powdering, N number of point position is measured relative to Laser emission plane
Height H1, H2...HN, it is calculated H1, H2...HNAverage value HA, calculate | H1-HA| ..., | HN-HA|, then calculate
The average value of absolute value is stated, and it is set to characterization parameter H.Equally, operating personnel can set a conjunction according to actual needs
Suitable value range, such as 0~H0（Comprising end points）, when H is less than H0When, then the size for showing defect herein can be receiving, make
It is also acceptable into the defect size in product, continues to print.Conversely, stopping printing, and feed back.
Wherein, the 4th kind of scheme of the characterization parameter H of described irregularity degree is：
The surface figure measuring device is optical imaging device, laser image forming apparatus or electronic imaging apparatus and supporting treatment
Software, described imaging device can form 3-D view.And graphics can be calculated by corresponding supporting treatment software
The maximum perpendicular height of projection absolute value H at the out-of-flatness of plane was hung relative to scraper as inmaxIt is exhausted with minimum recess depth
To value Hmin, and it is set to the characterization parameter H of surface irregularity degree.Accordingly, operating personnel can set according to actual needs
Suitable setting range value, it is considered that, the absolute value or recess depth absolute value of relative altitude are bigger, and corresponding position lacks
Sunken volume is bigger, can leave defect herein if continuing to print, and influences quality.Operating personnel can according to actual needs,
One suitable value range of setting, such as 0~H0（Comprising end points）, when H is less than H0When, then the size for showing defect herein is can
With what is received, it is also acceptable to cause the defect size in product, continues to print.Conversely, stopping printing, and feed back.
Wherein, the fifth version of the characterization parameter H of described irregularity degree is：
The surface figure measuring device is optical imaging device, laser image forming apparatus or electronic imaging apparatus and supporting treatment
Software, described imaging device can form 3-D view.And graphics can be calculated by corresponding supporting treatment software
The volume V of the raised big recess of maximum perpendicular at the out-of-flatness of plane was hung relative to scraper as inmax, and it is set to table
The characterization parameter H of face irregularity degree.Accordingly, operating personnel can according to actual needs set suitable setting range value, one
As think, the volume of convex/concave is bigger at out-of-flatness, and the defect volume of corresponding position is bigger, if continue print if can be herein
Place leaves defect, influences quality.Operating personnel can set a suitable value range, such as 0~H according to actual needs0（Bag
Containing end points）, when H is less than H0When, then the size for showing defect herein can be receiving, cause the defect size in product
Can be receiving, continue to print.Conversely, stopping printing, and feed back.
Further, step（3）Described in setting range value be operating personnel according to actual using needing to set
Value, its setting range value is corresponding with the characterization parameter H of corresponding surface irregularity degree, such as characterization parameter H of surface irregularity degree
During for maximum height absolute value, operating personnel can be according to the performance and the relation of H obtained in practical operation, setting range value
（Such as 0~maximum H0）, when H is more than H0When, then it is assumed that go beyond the scope.
Further, step（4）Middle Method of printing is the one kind in SLS, SLM.
Further, step（4）Middle feedack shows in the operation interface of 3D printing equipment, or for sound and/
Or visual alarm.
Using such Method of printing, operating personnel can according to actual needs set H0Value after, printed, pawnshop
When the flatness of bisque is undesirable, stop printing, follow-up remedial measure can be carried out after stopping printing, then proceed to beat
Print, or operating personnel can carry out continuation printing after suitably adjustment to printing technological parameter, to obtain the product of excellent performance.
The present invention also provides a kind of 3D printing equipment, including the housing for sealing, and power spreading device, institute are provided with the housing
State and surface figure measuring device is additionally provided with housing；
Also include data processing equipment, for processing the data that surface figure measuring device is obtained, obtain powder bed table
The characterization parameter H of face irregularity degree, and characterization parameter H is compared with setting range value；Also include data feedback device, use
In the data processed result and feedback data result that receive data processing equipment.
Preferably, the feedback device is electrically connected with data processing equipment.
Further, the power spreading device is scraper power spreading device or roller power spreading device.
Further, the surface figure measuring device is three-dimensional image forming apparatus or range unit, and three-dimensional image forming apparatus can
To obtain 3-D view Zhong Feng, the height of paddy, depth, area information.
Further, the surface figure measuring device is optical imaging device, laser image forming apparatus, electronic imaging apparatus
In one kind.
Further, the data processing equipment is single-chip microcomputer or computer.
Further, the data feedback device is one or more in display device, sound and/or light alarm device.
Wherein, data processing equipment can by the hardware such as this area conventional single-chip microcomputer, computer and the software for including,
Data processing equipment is processed surface topography characterize data, screens data, and such as highest point at powder surface irregularity is high
Degree HmaxWith lowest part depth Hmin, and data are fed back into operating personnel by feedback device, operating personnel are according to feedback result
Real-time regulation can be carried out to printing device, such as control is opened and closed, adjusts print parameters.Operating personnel can enter as needed
Maximum high, the deep value of the pattern on row setting surface（H0）, when the surface of a certain layer occurs being more than the setting value H0Out-of-flatness
During ground, data processing equipment control feedback device is fed back.
3D printing equipment of the invention and Method of printing can in real time be supervised to the flatness of powdering layer during printing
Survey, and, facilitate operating personnel to carry out Reasonable adjustment to printing technological parameter, it is to avoid powdering is not by monitoring result Real-time Feedback out
Product defects caused by uniform, and then increase substantially the performance of product.
Brief description of the drawings
Fig. 1 is the top view of the 3D printing equipment of the first implementation method of the invention.
Fig. 2 is the cross-sectional view of the 3D printing equipment of the first implementation method of the invention.
Specific embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that in the feelings not conflicted
Under condition, the embodiment in the present invention and the feature in embodiment can be mutually combined.For sake of convenience, hereinafter as occurred
" on ", D score, "left", "right" printed words, only represent that upper and lower, left and right direction with accompanying drawing in itself is consistent, does not limit structure
It is set for using.
The 3D printing equipment of present embodiment, including the housing 1 for sealing, are provided with the work with plane-parallel in housing 1
Power spreading device is provided with platform 2, the housing 1, surface figure measuring device is provided with around the power spreading device；Also wrap
Data processing equipment is included, for processing the data that surface figure measuring device is obtained, powder bed surface irregularity is obtained
The highest point height H at placemaxWith lowest part depth Hmin, and with setting value H0Compare, the data processing equipment and surface topography
Measurement apparatus are electrically connected；Also include data feedback device, for receiving the data processed result of data processing equipment and by data
Result feeds back to operating personnel, and the feedback device is electrically connected with data processing equipment.
Wherein, power spreading device is scraper power spreading device, and the scraper power spreading device is included for powder platform 301 and powdering platform
303, it is parallel with workbench 2 for powder platform 301 and powdering platform 303, the confession powder platform 301 and powdering platform 303
It has been respectively arranged below for powder cabin 304 and powdering storehouse 305, the top for powder cabin 304 and powdering storehouse 305 is open, for powder cabin 304
It is each attached on workbench 2 with powdering storehouse 305, the top end face for powder cabin 304 and powdering storehouse 305 is concordant with workbench 2, institute
Stating can rise for powder platform 301 along for powder cabin 304, and the powdering platform 303 can rise or fall along powdering storehouse 305；The confession
Powder platform 301 is provided with can scrape the Gua Fen mechanisms 302 to powdering platform 303 by powder, and the Gua Fen mechanisms 302 complete once
Can rise after scraper and be back to for powder platform 301.Workbench 2 is in inert gas shielding state.
Surface figure measuring device is laser image forming apparatus, and the laser image forming apparatus include laser 501 and inductor
502, the laser 501 is arranged at the left side of powdering platform 303, and the inductor 502 is arranged at the right side of powdering platform 303
Side, and positioned at powdering platform 303 and between powder platform 301, described imaging device also includes computer, and corresponding meter
Calculate imaging software.Data processing equipment is processed the 3-D view Zhong Feng that obtains, the height of paddy, depth, area information, point
Analysis obtains the highest point height H at powder surface irregularitymaxWith lowest part depth Hmin, and data are fed back by feedback device
To operating personnel.
Data handling system is processed the data for obtaining, and obtains the highest point height H at powder surface irregularitymax
With lowest part depth Hmin, and data are fed back into operating personnel by feedback device.
The 3D printing equipment of present embodiment also includes that the density of the powder bed density for measuring power spreading device laying is surveyed
Amount device 4, density measuring equipment 4 includes volume measurement device and Weight-measuring device, and density measuring equipment 4 is arranged at powdering storehouse
305 lower section, density measuring equipment is electrically connected with data processing equipment.
The data processing equipment is single-chip microcomputer；Data feedback device is main by display device and acoustic-optic alarm group
Be used to show Real-time Monitoring Data into, display device, for operating personnel's reference, acoustic-optic alarm give operating personnel's prompting or
Warning.
The content that above-described embodiment is illustrated should be understood to that these embodiments are only used for being illustrated more clearly that the present invention, without
For limiting the scope of the present invention, after the present invention has been read, those skilled in the art are to the various equivalent form of values of the invention
Modification each fall within the application appended claims limited range.
Claims (9)
1. a kind of 3D printing equipment Method of printing, it is characterised in that comprise the following steps：
（1）One layer of powder of paving, obtains powder bed；
（2）With surface figure measuring device to step（1）In powder bed characterized, obtain powder bed surface irregularity degree
Characterization parameter H；
（3）Characterization parameter H is compared with setting range value；
（4）When characterization parameter H meets the requirement of setting range value, printed；When characterization parameter H exceeds setting range value,
Stop printing, and feedback information.
2. 3D printing equipment Method of printing according to claim 1, described characterization parameter H is powder bed surface irregularity
The highest point height H at placemaxWith lowest part depth HminAbsolute value, or, described characterization parameter H is powder bed uneven surface
The cumulative volume at whole place, or, described characterization parameter H is the volume of the maximum single convex/concave of powder layer surface.
3. 3D printing equipment Method of printing according to claim 1, it is characterised in that step（4）Middle feedack exists
Shown in the operation interface of 3D printing equipment, or be sound and/or visual alarm.
4. a kind of housing of 3D printing equipment, including sealing（1）, the housing（1）Power spreading device is inside provided with, its feature exists
In the housing（1）Inside it is additionally provided with surface figure measuring device；
Also include data processing equipment, for processing the data that surface figure measuring device is obtained, obtain powder bed table
The characterization parameter H of face irregularity degree, and characterization parameter H is compared with setting range value；
Also include data feedback device, data processed result and feedback data result for receiving data processing equipment.
5. 3D printing equipment according to claim 4, it is characterised in that the power spreading device is scraper power spreading device or roller
Power spreading device.
6. 3D printing equipment according to claim 4, it is characterised in that the surface figure measuring device is three-dimensional imaging
Device or range unit.
7. 3D printing equipment according to claim 4, it is characterised in that the surface figure measuring device is optical imagery
One kind in device, laser image forming apparatus, electronic imaging apparatus.
8. 3D printing equipment according to claim 4, it is characterised in that the data processing equipment is single-chip microcomputer or calculating
Machine.
9. 3D printing equipment according to claim 4, it is characterised in that the data feedback device is display device, sound
And/or one or more in light alarm device.
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| CN201710316420.4A CN106903315B (en) | 2017-05-08 | 2017-05-08 | A kind of 3D printing equipment and Method of printing |
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Cited By (14)
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| CN107498874A (en) * | 2017-09-21 | 2017-12-22 | 杭州捷诺飞生物科技股份有限公司 | 3 D-printing synchronization microtomography on-line monitoring method and system |
| CN108481749A (en) * | 2017-11-16 | 2018-09-04 | 杭州捷诺飞生物科技股份有限公司 | The 3 D-printing method and device monitored in real time |
| CN109137706A (en) * | 2018-08-30 | 2019-01-04 | 成都博士信智能科技发展有限公司 | automatic printing method and device |
| CN109396430A (en) * | 2017-08-16 | 2019-03-01 | 业纳工业计量德国公司 | For manufacturing to production the device of metal assembly in a manner of based on powder bed |
| CN109551179A (en) * | 2018-11-29 | 2019-04-02 | 南方科技大学 | A kind of metal parts manufacturing method and manufacture system |
| WO2019094222A3 (en) * | 2017-11-08 | 2019-08-15 | General Electric Company | Dmlm build platform and surface flattening |
| CN110605854A (en) * | 2019-10-28 | 2019-12-24 | 杭州捷诺飞生物科技股份有限公司 | Printing control method, device and system and control equipment |
| CN111791495A (en) * | 2020-06-18 | 2020-10-20 | 共享智能铸造产业创新中心有限公司 | Method for detecting flatness of 3D printing powder laying surface |
| CN112773537A (en) * | 2021-02-02 | 2021-05-11 | 广州市帕菲克义齿科技有限公司 | Integrated denture processing system based on 3D modeling and processing method thereof |
| CN114147239A (en) * | 2021-12-07 | 2022-03-08 | 浙江机电职业技术学院 | SLM forming process parameter monitoring system |
| CN114434798A (en) * | 2021-12-28 | 2022-05-06 | 郭超 | 3D printing powder laying method, device and equipment and powder laying system |
| US11376793B2 (en) | 2018-04-26 | 2022-07-05 | Hewlett-Packard Development Company, L.P. | Printing production quality prediction |
| US11426943B2 (en) | 2017-04-19 | 2022-08-30 | Hewlett-Packard Development Company, L.P. | Selection of powder control temperature regions in 3D printing |
| US11511486B2 (en) | 2019-01-23 | 2022-11-29 | Hewlett-Packard Development Company, L.P. | Detecting three-dimensional (3D) part drag |
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