CN105344999A - Integrated capacitive sensing SLM powder laying scraper - Google Patents
Integrated capacitive sensing SLM powder laying scraper Download PDFInfo
- Publication number
- CN105344999A CN105344999A CN201510781413.2A CN201510781413A CN105344999A CN 105344999 A CN105344999 A CN 105344999A CN 201510781413 A CN201510781413 A CN 201510781413A CN 105344999 A CN105344999 A CN 105344999A
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- CN
- China
- Prior art keywords
- scraper
- powder
- capacitance
- voltage
- fixed value
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- B22F10/30—Process control
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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
- 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
- B22F12/60—Planarisation devices; Compression devices
- B22F12/67—Blades
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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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- 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)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses an integrated capacitive sensing SLM powder laying scraper which is used for the field of metal 3D printing based on an SLM. The integrated capacitive sensing SLM powder laying scraper comprises a scraper body and an insulation body, wherein the scraper body is fixed to the insulation body. The insulation body is mounted on a laser rapid forming device, and a coaxial cable is led out of the scraper body to enable the scraper body to be communicated with the input end of an amplifier, and an upper computer is connected to the amplifier. Two electrodes are formed by the scraper body and powder to form a capacitive structure. In the powder laying process, capacitance is generated between the scraper body and the powder, and the capacitance can be converted into signals; and the signals can reflect parts of unusual problems during powder laying, and therefore the process success rate is improved.
Description
Technical field
The metal dust that the present invention is mainly used in selective laser melt-forming (SLM) is paved, structure of modification has been carried out to existing common scraper, it is made to become a capacitor plate, electric capacity can be formed with metal dust, and be detected, thus certain monitoring can be carried out in paving powder process.
Background technology
SLM is that current precision is higher, the metal 3D printing technique of speed, and its middle berth powder is a key point in SLM technology, how to ensure paving powder uniform ground, and paving powder system lasting accuracy height is the core guaranteeing SLM technique.Existing scraper is generally simple frame for movement, only solves and scrapes powder problem.But in once complete SLM process, have several times and back and forth scrape powder, be difficult to avoid to run into some problems as:
1. scrape in powder process and run into unexpected shaping small embossment, cause scraper to damage or scraper motion overload.
2. scrape in powder process, last sintering process creates some deformation, or the powder feeding of powder feeding structure is not enough, causes some pits not filled and led up completely.
3. scrape in powder process, powder feeding structural failure, do not have powder to scrape.
4. blade wears, or loosen, cause with datum plane not parallel, the powder scraped also is not parallel to datum plane.
Summary of the invention
For above content, the present invention proposes a kind of paving powder blade construction newly, and common scraper is become capacitance sensor by this structure, by the change of capacitance signal, monitors paving powder process.
The SLM of integrated capacitance sensing spreads a powder scraper, it is characterized in that: comprise scraper, insulator, and scraper is fixing on insulator; Insulator is arranged on laser fast shaping device, and coaxial cable drawn by scraper, and by scraper and amplifier in conducting, amplifier connects host computer; Scraper and powder form two electrodes, form capacitance structure.
Further, paving powder scraper adopts carbide alloy, and insulator adopts pottery.
The method of the scraper described in application, is characterized in that:
Capacitance between scraper and powder can change along with the gap of scraper and powder, and this change is exaggerated device and is converted to voltage signal and is supplied to host computer, and host computer judges the position relationship of scraper plate and powder by voltage signal.
Described method, specific as follows:
Step 1: scraper is scraper and powder contact when spreading powder, judges whether capacitance is 0, if be not 0, scrapes powder abnormal;
Step 2: scrape after powder completes, keep any one value in the gap of 0.1mm-0.5mm to move on powder between scraper and powder, capacitance is converted into magnitude of voltage and exports and should be fixed value; Adopt this fixed value to be benchmark, depart from this fixed value as exported and can be judged as out-of-flatness more than 20%;
Step 3: after having sintered, keeps any one value in the gap of 0.1mm-0.5mm to move on powder, the powder after having sintered moves between scraper and powder, capacitance is converted into magnitude of voltage output and should be voltage fixed value; Adopt this voltage fixed value to be benchmark, depart from this voltage fixed value as exported and can be judged as out-of-flatness more than 20%; If capacitance signal is the two poles of the earth conducting of 0 explanation electric capacity, represents that foreign matter encountered by scraper, feed back to host computer, should stop motion in time.
What deserves to be explained is that gap in step 2 and step 3 is without any relation, in step 2 and step 3, voltage fixed value is also without any relation, just adds voltage two words above in order to avoid obscuring one.
In step 2 and step 3 20% is a recommendation, and general smooth required precision is high, can be set as 20%, even less.
The present invention mainly provides a kind of thinking, and the parameter inside method is along with requiring difference and different.
Accompanying drawing explanation
Fig. 1, present system figure
Fig. 2 the present invention scrapes powder example
In figure: 1. ceramic wafer, 2. coaxial cable, 3. scraper, 4. amplifier, 5. signaling interface, 6. blade, 7. metallic spatula, 8. metal dust
Detailed description of the invention
On traditional scraper 3, dress a slice ceramic wafer 1, scraper and the mechanism of installing scraper separate by pottery, make both not conductings.Can form an electric capacity between scraper 3 and metal dust 8, metal dust 8 and the earth conducting, form reference potential.Coaxial cable 2 and scraper 3 UNICOM, the capacitance on scraper 3 is sent in signal amplifier 4 by coaxial cable 2, and the signal amplified is the analog quantity of 0-10v, is sent to host computer by signaling interface 5.
Metallic spatula 3 and its fixed structure insulate and open by ceramic wafer 1, and metallic spatula is fixed on ceramic wafer 1, and ceramic wafer and fixed structure are fixed, and such metallic spatula does not directly contact fixed structure.Ceramic wafer is opened an aperture, the holding wire of coaxial cable 2 is communicated with metallic spatula 3 through aperture, and the other end connects amplifier 4, and the signal after amplification passes to host computer by signaling interface 5.
At the beginning, scraper scrapes powder delivery from other powder feeding mechanisms to paving powder process, and starts to spread powder, if now powder feeding mechanism lost efficacy, do not take powder out of, capacitance signal was greater than 0, otherwise should equal 0.
After paving powder completes, metallic spatula 3 can be passed by from the powder completed again again, and blade 6 is converted to capacitance signal with the spacing of powder and exports.If paving powder is smooth, export a capacitance Ct1, this value is usually converted to the conventional magnitude of voltage of industry and exports, and output area is 0-10V.This magnitude of voltage is recorded as reference value, pawnshop powder out-of-flatness, have obvious concavo-convex time, electric capacity can be greater than or less than Ct1, should make time-out after host computer obtains data, or continue motion action.
Sinter after paving powder completes.After having sintered, scraper is again through finished surface, and blade 6 and powder keep one between the spacing of 0.1mm-0.5mm to be worth, and corresponding output capacitance Ct2, converted voltage value value is generally 1-6V.Scraper is in motion process, host computer gathers this voltage signal with the sampling period of 1ms, if certain periodic sampling result departs from Ct2 and is less than Cto, Cto is supplied to user and arranges according to actual conditions, usual value is the 10%-20% of Ct2, then illustrate in sintering process and occurred projection, or metallic spatula 3 loosens tenesmus.If certain periodic sampling result departs from Ct2 and is greater than Cto, then illustrate in metal powder sintered process to have and subside.If certain periodic sampling result is 0, illustrate that scraper into contact has arrived foreign matter (projection as abnormal sintering).
Claims (4)
1. the SLM of integrated capacitance sensing spreads a powder scraper, it is characterized in that: comprise scraper, insulator, and scraper is fixing on insulator; Insulator is arranged on laser fast shaping device, and coaxial cable drawn by scraper, and by scraper and amplifier in conducting, amplifier connects host computer; Scraper and powder form two electrodes, form capacitance structure.
2. the SLM of a kind of integrated capacitance sensing according to claim 1 spreads powder scraper, it is characterized in that:
Paving powder scraper adopts carbide alloy, and insulator adopts pottery.
3. application rights requires the method for the scraper described in 1, it is characterized in that:
Capacitance between scraper and powder can change along with the gap of scraper and powder, and this change is exaggerated device and is converted to voltage signal and is supplied to host computer, and host computer judges the position relationship of scraper plate and powder by voltage signal.
4. method according to claim 3, is characterized in that specific as follows:
Step 1: scraper is scraper and powder contact when spreading powder, judges whether capacitance is 0, if be not 0, scrapes powder abnormal;
Step 2: scrape after powder completes, keep any one value in the gap of 0.1mm-0.5mm to move on powder between scraper and powder, capacitance is converted into magnitude of voltage and exports and should be fixed value; Adopt this fixed value to be benchmark, depart from this fixed value as exported and can be judged as out-of-flatness more than 20%;
Step 3: after having sintered, keeps any one value in the gap of 0.1mm-0.5mm to move on powder, the powder after having sintered moves between scraper and powder, capacitance is converted into magnitude of voltage output and should be voltage fixed value; Adopt this voltage fixed value to be benchmark, depart from this voltage fixed value as exported and can be judged as out-of-flatness more than 20%; If capacitance signal is the two poles of the earth conducting of 0 explanation electric capacity, represents that foreign matter encountered by scraper, feed back to host computer, should stop motion in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510781413.2A CN105344999B (en) | 2015-11-15 | 2015-11-15 | The SLM powderings scraper and the method using the scraper of a kind of integrated capacitance sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510781413.2A CN105344999B (en) | 2015-11-15 | 2015-11-15 | The SLM powderings scraper and the method using the scraper of a kind of integrated capacitance sensing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105344999A true CN105344999A (en) | 2016-02-24 |
| CN105344999B CN105344999B (en) | 2017-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510781413.2A Active CN105344999B (en) | 2015-11-15 | 2015-11-15 | The SLM powderings scraper and the method using the scraper of a kind of integrated capacitance sensing |
Country Status (1)
| Country | Link |
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| CN (1) | CN105344999B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584116A (en) * | 2017-08-10 | 2018-01-16 | 常兆芹 | Electric resistance welding formula metal three-dimensional printer and its application method |
| CN110340354A (en) * | 2018-04-08 | 2019-10-18 | 中国航发商用航空发动机有限责任公司 | Scraper for powder bed increasing material manufacturing judges automatically and selection method |
| US11426936B2 (en) | 2020-03-25 | 2022-08-30 | O. R. Lasertechnologie GmbH | Self leveling coating system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006205456A (en) * | 2005-01-26 | 2006-08-10 | Toyota Motor Corp | Powder supply device for laminating and shaping powder |
| US20100044922A1 (en) * | 2008-08-22 | 2010-02-25 | Panasonic Electric Works Co., Ltd. | Method and apparatus for producing a three-dimensionally shaped object |
| CN201572918U (en) * | 2009-12-30 | 2010-09-08 | 华南理工大学 | Elastic powder laying device |
| CN103363888A (en) * | 2013-06-18 | 2013-10-23 | 浙江工业大学 | Capacitance sensor-based upper grinding disc floating distance on-line measuring device |
| CN104439242A (en) * | 2014-12-10 | 2015-03-25 | 华中科技大学 | Quick forming and powder auto-spreading mechanism and powder auto-spreading and sintering method |
| CN104498863A (en) * | 2015-01-09 | 2015-04-08 | 北京工业大学 | Fiber hairbrush scraper |
| CN104625062A (en) * | 2015-03-03 | 2015-05-20 | 重庆大学 | Reciprocating powder laying device for selective laser melting |
| CN104722758A (en) * | 2015-03-04 | 2015-06-24 | 西安交通大学 | Device for improving density of part directly formed through selective laser melting process |
| CN204604902U (en) * | 2015-01-26 | 2015-09-02 | 杭州先临三维科技股份有限公司 | A kind of scraper voltage-stabilizing system |
-
2015
- 2015-11-15 CN CN201510781413.2A patent/CN105344999B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006205456A (en) * | 2005-01-26 | 2006-08-10 | Toyota Motor Corp | Powder supply device for laminating and shaping powder |
| US20100044922A1 (en) * | 2008-08-22 | 2010-02-25 | Panasonic Electric Works Co., Ltd. | Method and apparatus for producing a three-dimensionally shaped object |
| CN201572918U (en) * | 2009-12-30 | 2010-09-08 | 华南理工大学 | Elastic powder laying device |
| CN103363888A (en) * | 2013-06-18 | 2013-10-23 | 浙江工业大学 | Capacitance sensor-based upper grinding disc floating distance on-line measuring device |
| CN104439242A (en) * | 2014-12-10 | 2015-03-25 | 华中科技大学 | Quick forming and powder auto-spreading mechanism and powder auto-spreading and sintering method |
| CN104498863A (en) * | 2015-01-09 | 2015-04-08 | 北京工业大学 | Fiber hairbrush scraper |
| CN204604902U (en) * | 2015-01-26 | 2015-09-02 | 杭州先临三维科技股份有限公司 | A kind of scraper voltage-stabilizing system |
| CN104625062A (en) * | 2015-03-03 | 2015-05-20 | 重庆大学 | Reciprocating powder laying device for selective laser melting |
| CN104722758A (en) * | 2015-03-04 | 2015-06-24 | 西安交通大学 | Device for improving density of part directly formed through selective laser melting process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584116A (en) * | 2017-08-10 | 2018-01-16 | 常兆芹 | Electric resistance welding formula metal three-dimensional printer and its application method |
| CN110340354A (en) * | 2018-04-08 | 2019-10-18 | 中国航发商用航空发动机有限责任公司 | Scraper for powder bed increasing material manufacturing judges automatically and selection method |
| CN110340354B (en) * | 2018-04-08 | 2021-08-17 | 中国航发商用航空发动机有限责任公司 | Automatic scraper judging and selecting method for powder bed additive manufacturing |
| US11426936B2 (en) | 2020-03-25 | 2022-08-30 | O. R. Lasertechnologie GmbH | Self leveling coating system |
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| Publication number | Publication date |
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| CN105344999B (en) | 2017-06-06 |
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Effective date of registration: 20200911 Address after: Room 1001-06, 10 / F, building 11, Wangjing Dongyuan, Chaoyang District, Beijing Patentee after: KANGSHUO ELECTRIC GROUP Co.,Ltd. Address before: 100124 Chaoyang District, Beijing Ping Park, No. 100 Patentee before: Beijing University of Technology |