CN113020629A - 3D printing equipment for detecting oxygen content of metal powder based on characteristic spectrum and detection method thereof - Google Patents
3D printing equipment for detecting oxygen content of metal powder based on characteristic spectrum and detection method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 151
- 239000002184 metal Substances 0.000 title claims abstract description 98
- 238000001228 spectrum Methods 0.000 title claims abstract description 58
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000001301 oxygen Substances 0.000 title claims abstract description 55
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 55
- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 238000010146 3D printing Methods 0.000 title claims abstract description 25
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- 238000002844 melting Methods 0.000 abstract description 11
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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
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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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention relates to a 3D printing device and a detection method thereof based on characteristic spectrum and aiming at metal powder oxygen content detection, wherein the 3D printing device comprises an industrial personal computer, a laser emitter, a powder laying system, a light path system and a photoelectric detection system; the photoelectric detection system comprises a narrow-band optical filter, a photoelectric detection circuit module, a data acquisition and processing module and a communication module. The 3D printing equipment and the detection method thereof based on the characteristic spectrum and aiming at the detection of the oxygen content of the metal powder can detect the spectrum of the radiation light emitted by the selective laser melting metal molten pool in a molten state by utilizing the photoelectric detection system, and can successfully detect the change among the spectrums when the oxygen content in the metal powder is different, thereby facilitating the management of the repeated use of the selective laser melting metal powder and ensuring the printing quality.
Description
Technical Field
The invention relates to a 3D printing device for detecting the oxygen content of metal powder based on a characteristic spectrum and a detection method thereof, and belongs to the technical field of metal powder recycling and molten pool spectrum.
Background
Selective Laser Melting (SLM) is a technique of forming a metal powder by completely Melting the metal powder by the heat of a Laser beam and solidifying the metal powder by cooling. As one of 3D printing technologies, the SLM technology can be used for directly manufacturing a terminal metal product according to a 3D model, is suitable for workpieces with various complex shapes, and has good mechanical properties equivalent to those of the traditional process. However, since the SLM technology manufacturing process melts layer by layer and solidifies rapidly, the part may encounter repeated solid state phase changes; frequent directional heat extraction can cause the crystal grain structure to be columnar in the Z-axis direction (perpendicular to a construction platform), so that the mechanical property is usually anisotropic; defects such as internal pores and insufficient fusion between adjacent layers may occur during the SLM technology process.
The main problem solved by process monitoring is the variability of the SLM device or laser interaction with the material, as the latter in turn disturbs the microstructure or macroscopic mechanical properties of the metal. The microstructural properties of the additively manufactured part are determined by the thermal evolution process of the material, the "weld puddle" being the smallest unit that constitutes this process, so achieving "weld puddle monitoring" from this perspective enables real-time quality assurance.
The metal powder undergoes laser thermal action, and the atomic energy of the metal powder is transited from a higher energy level to a lower energy level. Each metal atom has a special spectrum series, and the atomic spectrum can reflect the internal structure of the atom according to the distribution rule of the wavelength, so that the characteristics of the powder can be known by researching the spectrum of the radiation light emitted when the metal powder is melted. In the selective laser melting technology, the oxygen content characteristic of the metal is particularly important, and the oxygen content characteristic has important influence on the tap density of the powder and the tensile property of a formed part. The spectral characteristics of the metal molten pool are detected, so that the oxygen content characteristics of the used powder are detected, and the method has important significance for controlling the quality of a printed workpiece and improving the recovery rate of the metal powder. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a 3D printing device for detecting the oxygen content of metal powder based on a characteristic spectrum, aiming at the problems in the prior art, and the technical scheme can indirectly detect the oxygen content of the used metal powder by detecting the radiation light spectrum of the metal powder in a molten state, so that the recovery rate of the metal powder is improved, and the cost is saved.
In order to achieve the purpose, the technical scheme of the invention is that the 3D printing equipment for detecting the oxygen content of the metal powder based on the characteristic spectrum comprises an industrial personal computer, a laser emitter, a powder laying system, a light path system and a photoelectric detection system; the photoelectric detection system comprises a narrow-band optical filter, a photoelectric detection circuit module, a data acquisition and processing module and a communication module; the control output end of the industrial personal computer is electrically connected with the emission control end of the laser emitter; the laser transmitter is used for providing laser input for the optical path system; the powder paving system is used for uniformly paving metal powder; the light path system is used for receiving laser input and providing converged laser for the powder laying system to burn the laid metal powder; the narrow-band filter is used for separating molten pool radiation light with selected wavelength from the optical path system; the photoelectric detection circuit module is butted with the narrow band filter and is used for carrying out photoelectric induction on the molten pool radiation light separated by the narrow band filter; the data acquisition and processing module is electrically connected with the photoelectric detection circuit module and is used for acquiring and processing a molten pool radiation photoelectric signal obtained by photoelectric induction to obtain a digital signal representing molten pool radiation spectrum information; the communication module is electrically connected with the data acquisition and processing module and is used for sending digital signals representing the spectral information of the radiation of the molten pool to the industrial personal computer, and the industrial personal computer controls the start and stop of the laser transmitter, the powder spreading system and the light path system according to the digital signals representing the spectral information of the radiation of the molten pool.
As a further scheme of the 3D printing device, the optical path system includes a beam expander, a galvanometer system, an F-theta field lens, and a coaxial beam splitter; the beam expander is connected with the laser transmitter through an optical fiber and used for receiving laser input; the beam expander is connected with the galvanometer system in a butt joint mode and used for expanding the received laser input; the F-theta field lens is butted with the galvanometer system, and the converged laser of the galvanometer system is emitted out through the F-theta field lens; the coaxial spectroscope is butted with the galvanometer system and is used for separating the molten pool radiation light from the reflected laser to obtain the independent molten pool radiation light; the narrow-band filter is connected with the coaxial spectroscope through the sealing sleeve to avoid the penetration of ambient light.
As a further scheme of the 3D printing equipment, the powder spreading system comprises a forming processing box, a powder supply cylinder, a forming cylinder, a powder spreading scraper, a forming substrate and a recovery cylinder; the powder supply cylinder, the forming cylinder and the recovery cylinder are sequentially arranged on the bottom of the forming processing box from left to right, the powder supply cylinder is used for lifting metal powder layer by layer, the forming cylinder is used for lowering the forming substrate layer by layer, and the recovery cylinder is used for recovering redundant metal powder; the powder spreading scraper is transversely installed in the forming and processing box in a sliding mode and used for scraping and laying the lifted metal powder on the forming substrate and scraping redundant metal powder into the recovery cylinder.
As a further scheme of the 3D printing device, the powder laying system further comprises an inert gas supplier; the inert gas supplier fills inert gas into the molding processing box through the airflow guide pipe so as to ensure that the oxygen content in the molding processing box meets the process and safety requirements.
The invention also provides a detection method of the 3D printing equipment for detecting the oxygen content of the metal powder based on the characteristic spectrum, which comprises the following steps:
and 4, determining the oxygen content degree of the metal powder to be measured at present according to the oxygen content degree corresponding to the found spectrum matching curve, and controlling the start and stop of the laser emitter, the powder paving system and the light path system by the industrial personal computer.
As a further scheme of the detection method, in the steps 1 and 2, the specific steps of measurement according to the spectral measurement rule are as follows: step a, separating molten pool radiation light returned by a galvanometer system from reflected laser by a coaxial spectroscope to obtain independent molten pool radiation light;
b, inducing the molten pool radiation light separated from the narrow band filter by a photoelectric detection circuit module to obtain a molten pool radiation photoelectric signal;
step c, the photoelectric signal of the radiation of the molten pool is converted into a digital signal representing the spectral information of the radiation of the molten pool through a data acquisition and processing module;
and d, sending the digital signal representing the spectral information of the radiation of the molten pool to an industrial personal computer by the communication module, and drawing a corresponding spectral curve by the industrial personal computer according to the received digital signal.
As a further scheme of the detection method, when the narrowband filter in the step b is used, the narrowband filters with different central wavelengths need to be selected according to the type of the metal powder, and the steps a to d are repeatedly executed after the narrowband filters with different central wavelengths are selected.
As a further scheme of the detection method, in step 1, when the metal powders with different oxygen content degrees are subjected to spectrum matching curve measurement, the steps a to d are repeatedly performed on the metal powders with each oxygen content degree.
Compared with the prior art, the invention has the following advantages: the technical scheme utilizes the photoelectric detection system to detect the spectrum of the radiant light emitted by the selective laser melting metal melting pool in a melting state, and when the oxygen content in the metal powder is different, the difference between the spectrums can be successfully detected, so that the selective laser melting metal powder can be recovered conveniently, and the printing quality can be ensured.
Drawings
FIG. 1 is a schematic structural component diagram of a 3D printing apparatus according to the present invention;
FIG. 2 is a schematic signal flow diagram of a 3D printing apparatus according to the present invention;
FIG. 3 is a graph of the difference in measured spectra of a powder of the present invention using TC4 versus virgin powder;
FIG. 4 is a graph showing the breaking force distribution of tensile specimens processed using TC4 waste powder and virgin powder according to the present invention.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: as shown in fig. 1, the 3D printing apparatus for metal powder oxygen content detection based on characteristic spectrum disclosed by the present invention includes: the device comprises an industrial personal computer 2, a laser emitter 3, a powder spreading system, a light path system and a photoelectric detection system 15; the photoelectric detection system 15 comprises a narrow-band optical filter, a photoelectric detection circuit module, a data acquisition and processing module and a communication module; the control output end of the industrial personal computer 2 is electrically connected with the emission control end of the laser emitter 3 through a control signal line 18; the laser transmitter 3 is used for providing laser input for the optical path system; the powder paving system is used for realizing uniform paving of the metal powder 11; the optical path system 15 is used for receiving laser input and providing converged laser for the powder laying system to burn the laid metal powder 11; the narrow-band filter is used for separating molten pool radiation light with selected wavelength from the optical path system; the photoelectric detection circuit module is butted with the narrow band filter and is used for carrying out photoelectric induction on the molten pool radiation light separated by the narrow band filter; the data acquisition and processing module is electrically connected with the photoelectric detection circuit module and is used for acquiring and processing a molten pool radiation photoelectric signal obtained by photoelectric induction to obtain a digital signal representing molten pool radiation spectrum information; the communication module is electrically connected with the data acquisition and processing module and is used for sending digital signals representing the spectral information of the radiation of the molten pool to the industrial personal computer 2 through the Ethernet cable 16, and the industrial personal computer 2 controls the start and stop of the laser transmitter 3, the powder spreading system and the light path system according to the digital signals representing the spectral information of the radiation of the molten pool. The photoelectric detection system 15 can detect the spectrum of the radiation light emitted by the selective laser melting metal molten pool in a molten state, and when the oxygen content in the metal powder is different, the difference between the spectrums can be successfully detected, so that the selective laser melting metal powder can be recovered conveniently, and the printing quality can be ensured.
Example 2: as shown in fig. 1, as a further aspect of the 3D printing apparatus, a coaxial optical path system is adopted, which can observe a local region centered on a molten pool, and can reflect molten state information of the molten pool more accurately than an off-axis optical path system having a larger observation width. The optical path system comprises a beam expander 5, a galvanometer system 4, an F-theta field lens 19 and a coaxial spectroscope 6; the beam expander 5 is connected with the laser transmitter 3 through an optical fiber 17 and used for receiving laser input; the beam expander 5 is butted with the galvanometer system 4 and is used for expanding the received laser input; the F-theta field lens 19 is butted with the galvanometer system 4, and the converged laser of the galvanometer system 4 is emitted out through the F-theta field lens 19; the coaxial spectroscope 6 is butted with the galvanometer system 4 and is used for separating the molten pool radiation light from the reflected laser to obtain the single molten pool radiation light; the narrowband filter is interfaced with the coaxial beam splitter 6. The rest of the structure and advantages are exactly the same as those of embodiment 1.
Example 3: as shown in fig. 1, as a further scheme of the 3D printing apparatus, the powder spreading system includes a forming and processing box 1, a powder supply cylinder 10, a forming cylinder 13, a powder spreading scraper 9, a forming substrate 12 and a recovery cylinder 14; the powder supply cylinder 10, the forming cylinder 13 and the recovery cylinder 14 are sequentially arranged on the bottom of the forming processing box 1 from left to right, the powder supply cylinder 10 is used for lifting the metal powder 11 layer by layer, the forming cylinder 13 is used for lowering the forming substrate 12 layer by layer, and the recovery cylinder 14 is used for recovering redundant metal powder 11; the powder spreading scraper 9 is transversely installed in the forming and processing box 1 in a sliding manner and is used for spreading the lifted metal powder 11 on the forming substrate 12 and scraping the redundant metal powder 11 into the recovery cylinder 14; the F-theta field lens 19 is located above the molding substrate 12. The rest of the structure and advantages are exactly the same as those of embodiment 1.
Example 4: as a further version of the 3D printing apparatus, as shown in fig. 1, the powder laying system further comprises an inert gas supply 7; the inert gas supplier 7 fills the inside of the molding box 1 with an inert gas through the gas flow duct 8. An inert gas supplier 7 is used for filling inert gas into the forming processing box 1 by using an air flow conduit 8 so as to ensure that the oxygen content of the gas in the forming processing box 1 meets the engineering safety requirement in the printing process. However, the oxygen content of the gas in the molding box 1 cannot be zero, and since the recovered powder contains the metal powder 11 on the molding substrate 12 that has not been melted and is oxidized by contact with the laser light and the gas in the molding box 1, the oxygen content of the recovered metal powder 11 is increased. Under normal conditions, if the oxygen content ratio in the recycled metal powder 11 can still meet the printing requirement, the recycled metal powder 11 can still be put into the powder supply cylinder 10 for continuous use, but the processing performance of the printed workpiece will be affected. Therefore, the oxygen content detection of the used metal powder 11 has very important technical and economic significance for improving the recovery rate of the metal powder 11. The rest of the structure and advantages are exactly the same as those of embodiment 1.
Example 5: as shown in fig. 2, the invention provides a detection method of a 3D printing device for detecting oxygen content of metal powder based on a characteristic spectrum, comprising the following steps:
and 4, determining the oxygen content degree of the metal powder 11 to be measured at present according to the oxygen content degree corresponding to the found spectrum matching curve, and controlling the start and stop of the laser emitter 3, the powder spreading system and the light path system by the industrial personal computer 2.
In the steps 1 and 2, the specific steps of measuring according to the spectrum measuring rule are as follows:
step a, separating the molten pool radiation light returned by the galvanometer system 4 from the reflected laser by a coaxial spectroscope 6 to obtain independent molten pool radiation light;
b, inducing the molten pool radiation light separated from the narrow band filter by a photoelectric detection circuit module to obtain a molten pool radiation photoelectric signal;
step c, the photoelectric signal of the radiation of the molten pool is converted into a digital signal representing the spectral information of the radiation of the molten pool through a data acquisition and processing module;
and d, sending the digital signal representing the spectral information of the radiation of the molten pool to the industrial personal computer 2 by the communication module, and drawing a corresponding spectral curve by the industrial personal computer 2 according to the received digital signal.
When the narrowband filter in the step b is used, the narrowband filters with different central wavelengths need to be selected according to the type of the metal powder 11, and the steps a to d are repeatedly executed after the narrowband filters with different central wavelengths are selected. By replacing the narrow-band filters with different central wavelengths, a complete spectral curve of the molten pool radiated light can be obtained, and because each atom has a special spectral sequence, the oxygen content in the metal powder 11 is different, the spectral characteristics of the atoms are different, and the spectral curves of the molten pool radiated light of the metal powder 11 with different use degrees are drawn by using the digital voltage signals of the radiated light obtained by the industrial personal computer 2, so that the oxygen content in the metal powder 11 can be further determined. In step 1, when the metal powder 11 with different oxygen content degrees is subjected to spectrum matching curve measurement, the steps a to d are repeatedly performed on the metal powder 11 with each oxygen content degree.
As shown in fig. 3, the difference curves of the measured spectrum signals are obtained by using the abandoned TC4 powder (i.e. the printed workpiece can not meet the mechanical property requirement) and the brand-new TC4 powder. Three groups of experiments are designed, and the three groups of experiment results show that the brand-new TC4 powder and the abandoned TC4 powder have obvious difference in partial wavelength intervals of spectral curves, the difference is caused by different oxygen contents in the TC4 powder, and therefore the oxygen content in the powder can be detected by detecting the spectral change of the radiation light of a molten pool.
The working process is as follows: referring to fig. 1 to 4, the 3D printing apparatus of the present invention includes the following steps in printing: before each layer of the workpiece is printed, a powder supply cylinder 10 in a powder spreading system is lifted, a forming cylinder 13 is descended, a powder spreading scraper 9 uniformly spreads metal powder 11 overflowing from the powder supply cylinder 10 onto a forming substrate 12, redundant metal powder 11 is sent to a recovery cylinder 14, then the powder supply cylinder 10 descends, the powder spreading scraper 9 resets, and the layer is printed after a laser emitter 3 is started; after the layer is printed, the powder spreading system repeats the steps; laser emitted by a laser emitter 3 is firstly expanded by a beam expander 5, then the incidence direction of the laser is adjusted by a galvanometer system 4, the laser is converged on a forming substrate 12 by an F-theta field lens 19, metal powder 11 is burned, the generated metal molten pool radiation light and the reflected laser return to a laser incidence point through the original path of the galvanometer system 4, and the laser and the metal molten pool radiation light are separated by a coaxial spectroscope 6 and a narrow-band filter to obtain independent metal molten pool radiation light; before printing, selecting a narrow-band filter with a proper central wavelength according to the characteristic spectral characteristics of the printed metal powder 11, and inducing the metal molten pool radiation light with the wavelength by a data acquisition and processing module through a photodiode to obtain photocurrent; because the forming time of a molten pool is in the order of mu s in the SLM metal forming process, and the photocurrent signal actually output by the photodiode in an induction mode is below the mu A level, an amplifying circuit with a composite structure is designed and used in the data acquisition and processing module, has the performances of high multiplying power, wide frequency band, low drift and low noise, can effectively detect the weak photocurrent signal, converts the weak photocurrent signal into an analog voltage signal, and then converts the analog voltage signal into a digital voltage signal; the obtained digital signals are subjected to mean value filtering, then are stored in a memory, and digital voltage signals are transmitted to the industrial personal computer 2 by utilizing the Ethernet and adopting a UDP protocol, so that the oxygen content in the metal powder 11 is quantitatively analyzed in real time.
To illustrate the difference of the method in the mechanical properties of the powder with different oxygen contents, two groups of control experiments are designed, TC4 new powder and old powder are respectively used for printing 6 tensile pieces meeting the GB/T228 standard, and after the printing is finished, the breaking force of each group of tensile pieces is tested. The test data results are shown in table 1, and the force at break distribution for the different tensile members is shown in fig. 4.
As can be seen from the data in table 1 and fig. 4, the fracture force distribution of 6 tension members is more uniform and the standard deviation is smaller for the workpieces printed with the new powder having a lower oxygen content; in the workpiece printed by using the old powder with higher oxygen content, the difference of the breaking force of 6 stretching pieces is larger, namely the standard deviation is larger. This indicates that the tensile properties of the work printed with the powder having a high oxygen content become more unstable and the quality of the formed product becomes more difficult to predict than the work printed with the powder having a low oxygen content.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (7)
1. A3D printing device for detecting oxygen content of metal powder based on a characteristic spectrum is characterized by comprising an industrial personal computer (2), a laser emitter (3), a powder laying system, a light path system and a photoelectric detection system (15); the photoelectric detection system (15) comprises a narrow-band optical filter, a photoelectric detection circuit module, a data acquisition and processing module and a communication module; the control output end of the industrial personal computer (2) is electrically connected with the emission control end of the laser emitter (3); the laser transmitter (3) is used for providing laser input for the optical path system; the powder laying system is used for realizing uniform laying of the metal powder (11); the light path system is used for receiving laser input and providing converged laser for the powder laying system to burn the laid metal powder (11); the narrow-band filter is used for separating molten pool radiation light with selected wavelength from the optical path system; the photoelectric detection circuit module is butted with the narrow band filter and is used for carrying out photoelectric induction on the molten pool radiation light separated by the narrow band filter; the data acquisition and processing module is electrically connected with the photoelectric detection circuit module and is used for acquiring and processing a molten pool radiation photoelectric signal obtained by photoelectric induction to obtain a digital signal representing molten pool radiation spectrum information; the communication module is electrically connected with the data acquisition and processing module and is used for sending digital signals representing the radiation spectrum information of the molten pool to the industrial personal computer (2), and the industrial personal computer (2) controls the start and stop work of the laser transmitter (3), the powder spreading system and the light path system according to the digital signals representing the radiation spectrum information of the molten pool.
2. The 3D printing device for metal powder oxygen content detection based on characteristic spectrum according to claim 1, wherein the optical path system comprises a beam expander (5), a galvanometer system (4), an F-theta field lens (19) and a coaxial spectroscope (6); one end of the beam expander (5) is connected with the laser transmitter (3) through an optical fiber (17) and used for receiving laser input; the other end of the beam expander (5) is butted with the galvanometer system (4) and is used for expanding the received laser input; the F-theta field lens (19) is butted with the galvanometer system (4), and the converged laser of the galvanometer system (4) is emitted through the F-theta field lens (19); the coaxial spectroscope (6) is butted with the galvanometer system (4) and is used for separating the molten pool radiation light from the reflected laser to obtain the independent molten pool radiation light; the narrow-band filter is connected with the coaxial spectroscope (6).
3. The 3D printing device for metal powder oxygen content detection based on characteristic spectrum as claimed in claim 2, wherein the powder spreading system comprises a forming processing box (1), a powder supply cylinder (10), a forming cylinder (13), a powder spreading scraper (9), a forming substrate (12) and a recovery cylinder (14); the powder supply cylinder (10), the forming cylinder (13) and the recovery cylinder (14) are sequentially arranged at the bottom of the forming processing box (1) from left to right, the powder supply cylinder (10) is used for lifting the metal powder (11) layer by layer, the forming cylinder (13) is used for descending the forming substrate (12) layer by layer, and the recovery cylinder (14) is used for recovering redundant metal powder (11); the powder spreading scraper (9) is transversely installed in the forming processing box (1) in a sliding mode and is used for scraping and paving the lifted metal powder (11) on the forming base plate (12) and scraping the redundant metal powder (11) into the recovery cylinder (14); the F-theta field lens (19) is positioned above the molding substrate (12).
4. The 3D printing device for metal powder oxygen content detection based on characteristic spectrum as claimed in claim 3, characterized in that the powder laying system further comprises an inert gas supplier (7), wherein the initial oxygen content usually does not exceed 0.01%, and inert gas is filled into the forming processing box (1) through the air flow conduit (8) by the inert gas supplier (7) during the printing task to ensure that the oxygen content in the forming processing box (1) meets the process and safety requirements.
5. The detection method for a 3D printing device for metal powder oxygen content detection based on characteristic spectrum according to any one of claims 1-4, characterized in that the method comprises the following steps:
step 1, measuring various spectral matching curves of various types of metal powder (11) with different oxygen content degrees according to a spectral measurement rule;
step 2, measuring a spectrum real-time curve of the metal powder (11) to be measured at present according to a spectrum measurement rule;
step 3, matching the spectrum real-time curve of the metal powder (11) of the corresponding type with each spectrum matching curve to find out the spectrum matching curve with the minimum mean square difference value of the spectrum signals;
and 4, determining the oxygen content degree of the metal powder (11) to be measured at present according to the oxygen content degree corresponding to the found spectrum matching curve, and controlling the start and stop work of the laser transmitter (3), the powder spreading system and the light path system by the industrial personal computer (2).
6. The detection method for detecting the oxygen content of the metal powder based on the characteristic spectrum according to claim 5, wherein in the step 1 and the step 2, the specific steps of measurement according to the spectral measurement rule are as follows:
step a, separating molten pool radiation light returned by a galvanometer system (4) from reflected laser by a coaxial spectroscope (6) to obtain independent molten pool radiation light;
b, inducing the molten pool radiation light separated from the narrow band filter by a photoelectric detection circuit module to obtain a molten pool radiation photoelectric signal;
step c, the photoelectric signal of the radiation of the molten pool is converted into a digital signal representing the spectral information of the radiation of the molten pool through a data acquisition and processing module;
and d, sending the digital signal representing the spectral information of the radiation of the molten pool to the industrial personal computer (2) by the communication module, and drawing a corresponding spectral curve by the industrial personal computer (2) according to the received digital signal.
7. The detection method for detecting the oxygen content of the metal powder based on the characteristic spectrum according to claim 6, wherein when the narrowband filter in the step b is used, the narrowband filters with different central wavelengths and a bandwidth not exceeding 10nm need to be selected according to the type of the metal powder (11), and the steps a to D are repeatedly executed after the narrowband filters with different central wavelengths are selected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336864.0A CN113020629A (en) | 2021-03-30 | 2021-03-30 | 3D printing equipment for detecting oxygen content of metal powder based on characteristic spectrum and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336864.0A CN113020629A (en) | 2021-03-30 | 2021-03-30 | 3D printing equipment for detecting oxygen content of metal powder based on characteristic spectrum and detection method thereof |
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| CN113020629A true CN113020629A (en) | 2021-06-25 |
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