CN111366598A - Actual measurement method for ratio of 3D printing mixed powder - Google Patents
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Abstract
The invention discloses a method for actually measuring the ratio of mixed powder in 3D printing, which comprises the following steps: collecting and sampling mixed powder; determining the main element with the largest difference between the components of the powder A and the powder B; coloring the two main elements in the same visual field, and respectively shooting a spectrogram photo and a real object color photo; importing image processing software, and picking up main element coloring pixel points by using a color range function; the total area of the coloring pixels is obtained by using a recording measurement function, and the mixed powder ratio is determined according to the calculation. The method can effectively solve the problem of the matching test of the 3D printing mixed powder with the same color, similar apparent density and similar particle size, and compared with the traditional method for measuring the powder particles one by one, the method has the advantages of high speed, high efficiency, small error, simple operation and easy implementation.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a method for actually measuring the ratio of mixed powder in 3D printing.
Background
The functional gradient material is a novel composite material which is compounded by two or more materials, the components and the structure of the composite material are in continuous gradient change, the material components and the macroscopic performance of the composite material are in continuous and uniform gradient change in spatial positions, the defects of stress concentration and microcrack caused by different phase interfaces of the traditional composite material are overcome, and the differential requirements of different parts of structural members in the fields of spaceflight, energy and biomedicine on the use performance of the material can be met. Laser deposition (3D printing), which realizes gradient change of material properties by controlling the mass ratio of mixed powder, is an important method for preparing functionally gradient materials. However, when the quality and the particle diameter of the adopted powder are different, the mixed powder is separated after being sprayed at a high speed through the powder feeding pipe, so that the component deviation of the material is caused, the service performance of the material is reduced, and the design requirement cannot be met. Therefore, how to quickly and accurately measure the actual mass ratio of the mixed powder is a premise and basis for realizing powder separation regulation and control and ensuring the accurate components of the functional gradient material.
In recent years, engineers have come to recognize the importance of accurate detection of the mixture ratio of the components of the mixed powder, and have conducted extensive studies on the method and apparatus for detecting the mixture ratio of the powder. The Chinese patent with publication number CN105486705B provides a method for quantitatively analyzing components of a powder mixture, powder values and absorption coefficients are obtained through X-ray diffraction spectrum analysis, and then a lever law formula is established to measure the mass ratio of the powder; the Chinese patent with publication number CN109916941A proposes a 3D printing separation detection method for premixed powder, which comprises the steps of measuring the diameters of powder particles in a spectral color chart one by one through an image measuring system Digimizer, and calculating to obtain the mass ratio of the mixed powder after the sum of converted volumes; on the basis, the Chinese patent with the publication number of CN109746447A provides a method for regulating and controlling the separation of premixed powder, and realizes the accurate regulation and control of the separation of the powder. The powder component and proportion testing method provided in the patent needs to measure powder particles one by one, the testing workload is large, the calculation process is too complex, and the requirement on the mathematical level of technicians is high.
With the rapid rise of artificial intelligence technology, research and development and engineers are gradually aware of using computer image recognition methods to solve engineering problems. The Chinese patent with publication number CN110658040A proposes a preparation method of a metal spherical powder standard sample, and image statistical software is used for completing the particle size statistics of powder particles; the chinese patent of the invention with publication number CN110335257A proposes an image color detection method and a mobile terminal, which can identify the color tone information of image data; the chinese patent of the invention with publication number CN107068589B proposes a crystal grain selection system and method based on image recognition, which decomposes the image of a standard crystal grain into pixel points through a blue film, and records the gray scale standard value of each pixel point to realize the crystal grain selection; the chinese patent publication No. CN110853017A discloses a statistical method for the number of round particles in a powder particle image, which is to extract a communication domain in the image and combine a center drift algorithm to realize statistics of the number and size of powder particles with irregular shapes, different sizes and overlapping conditions in the image. However, the above method either requires additional hardware or is too complicated in calculation, and the actual operation is very difficult. Aiming at mixed powder with the same color, similar apparent density and similar particle size, a simple, quick and effective mixed powder ratio actual measurement method is lacked.
Disclosure of Invention
The invention aims to provide a method for actually measuring the ratio of 3D printing mixed powder, which can effectively solve the problems of the ratio measurement of 3D printing mixed powder with the same color, similar apparent density and similar particle size, and has the advantages of high speed and high efficiency.
In order to solve the technical problem, the invention provides a method for actually measuring the ratio of mixed powder for 3D printing, which comprises the following steps:
step one, obtaining a sample with mixed powder, wherein the mixed powder comprises powder A and powder B;
step two, selecting the element E with the largest difference of chemical compositions of the powder A and the powder BAAnd EBWherein, element EAIs the main element of the powder A, element EBIs the main element of powder B;
step three, scanning the element energy spectrum surface of the sample surface through a scanning electron microscope, and setting an element E on a software interface attached to the energy spectrum analyzerAFor a first color, element E is setBA second color, the first color and the second color being three primary colors of two different colors;
step four, obtaining element E in the sample under the same view fieldAFIG. A shows the spectrum of the sampleBIn the spectrum fig. b and in the color picture fig. c, wherein the color picture fig. c simultaneously corresponds to the element EAAnd element EBColoring;
step five, judging whether the dust particles in the color photo figure FIG. C are completely colored, if so, entering step six; if not, adjusting the shooting position of the scanning electron microscope, selecting a neighboring area, and repeating the step four until the powder particles in the fig. C are completely colored;
step six, processing the energy spectrum photo fig. A through image processing software to obtain an element E in the energy spectrum photo fig. AATotal pixel area SAThe method specifically comprises the following steps:
s61, if powder B does not contain element EAPicking up and selecting the coloring area in the energy spectrum photo fig. A until all non-background colors are selected, and acquiring the total pixel area S of the coloring area by utilizing the recording measurement function in the image processing softwareA；
S62, if powder B contains element EAAll the colored areas in the energy spectrum fig. a are picked up and selected, after which the element E in the color photograph fig. c is taken as the basisBInterference pixels in the spectral photo Fig.A are removed corresponding to the positions of the powder particles, and the total pixel area S of the coloring area after the interference pixels are removed is obtained by utilizing the recording and measuring function in the image processing softwareA；
Step seven, processing the energy spectrum photo fig. B through image processing software to obtain an element E in the energy spectrum photo fig. BBTotal pixel area SBThe method specifically comprises the following steps:
s71 if in powder ADoes not contain element EBPicking up and selecting the coloring area in the energy spectrum photo fig. B until all non-background colors are selected, and acquiring the total pixel area S of the coloring area by utilizing the recording measurement function in the image processing softwareB；
S72, if powder A contains element EBThen all the colored areas in the energy spectrum fig. b are picked up and selected, after which the element E in the colour photograph fig. c is taken as the basisAInterference pixels in the spectral photo Fig.B are removed corresponding to the positions of the powder particles, and the total pixel area S of the coloring area after the interference pixels are removed is obtained by utilizing the recording and measuring function in the image processing softwareB；
Step eight, calculating to obtain an actually measured mixture ratio η of the mixed powder;
where ρ isAApparent density of powder A, pBIs the apparent density of powder B, mAIs the total mass of powder A, mBIs the total mass of powder B, nANumber of particles of powder A in FIG. C, nBThe number of particles of powder B in fig. c,
the average diameter of the powder particles provided by the manufacturer of powder a,
the average diameter of the powder particles, μ being the pixel scale,
preferably, in S61, a color sampling "pipette +" is used to pick up the colored area in the spectral photograph fig. a.
Preferably, in S62, the interfering pixels in the spectral photograph fig. a are removed using a color sampling "pipet-" pick-up.
Preferably, the step one specifically comprises:
s11, fixing an acrylic plate on a workbench of the 3D printer, wherein a release film is arranged on the upper surface of the acrylic plate, and a double-sided adhesive layer and a liquid-state cycloaliphatic adhesive layer are sequentially arranged on the release film;
s12, loading the mixed powder into a powder feeding hopper of a 3D printer, opening the powder feeding hopper, keeping a laser beam closed, enabling a 3D printing laser nozzle to spray the powder towards the acrylic plate to obtain the acrylic plate covering the mixed powder layer, and then standing and cooling until the liquid epoxy resin glue is solidified;
and S13, sampling, cleaning and drying the mixed powder layer adhered to the acrylic plate to obtain a sample.
Preferably, the 3D printing laser head in S12 is of a coaxial powder feeding type.
Preferably, the image processing software is Photoshop.
Preferably, the image processing software is FlantR.
Preferably, the energy spectrum photo fig. a in the step six is a png lossless compression format picture.
Preferably, the energy spectrum photo fig. b in the step seven is png lossless compression format picture.
Preferably, in S71, a color sampling "pipette +" is used to pick up the colored region in the spectral photo fig.b; in S72, a color sampling pipette is used to pick up and remove interfering pixels in the spectral photo fig.
The invention has the beneficial effects that:
1. the invention provides a method for actually measuring the ratio of 3D printing mixed powder, which can effectively solve the problem of the ratio test of 3D printing mixed powder with the same color, similar apparent density and similar particle size, and compared with the traditional method for measuring powder particles one by one, the method provided by the invention has the advantages of high speed, high efficiency and less error than 5%.
2. The invention has low requirement on the quality of the service of the detection personnel, and has simple operation and easy implementation.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
FIG. 2 is a schematic view of powder collection according to an embodiment of the present invention;
FIG. 3 is a schematic surface-scanning elemental spectrum of a mixed powder according to the present invention.
The reference numbers in the figures illustrate: 1. a powder feeding hopper; 2. a powder tube; 3. a coaxial optical internal powder feeding laser head; 4. epoxy resin glue; 5. double-sided adhesive tape; 6. acrylic plates; 7. powder feeding track; 8. a work table; 9. mixing the powder; 10. a powder B pixelet; 11. a powder a pixelet; 12. interference pixels of powder a; 13. element EAThe energy spectrum photo of (1); 14. color photograph of mixed powder material; 15. element EBA photograph of the spectrum of (1).
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The invention discloses a method for actually measuring the ratio of mixed powder in 3D printing, which comprises the following steps:
step one, obtaining a sample with mixed powder, wherein the mixed powder comprises powder A and powder B:
s11, fixing an acrylic plate on a workbench of the 3D printer, wherein a release film is arranged on the upper surface of the acrylic plate, and a double-sided adhesive layer and a liquid-state cycloaliphatic adhesive layer are sequentially arranged on the release film;
and S12, loading the mixed powder into a powder feeding hopper of the 3D printer, opening the powder feeding hopper, keeping a laser beam closed, spraying the powder towards the acrylic plate by using a 3D printing laser nozzle to obtain the acrylic plate covering the mixed powder layer, standing and cooling until the liquid epoxy resin adhesive is solidified, wherein the 3D printing laser nozzle is of a coaxial powder feeding type.
And S13, sampling, cleaning and drying the mixed powder layer adhered to the acrylic plate to obtain a sample.
Step twoThe element E having the largest difference in chemical composition between the selected powder A and the selected powder BAAnd EBWherein, element EAIs the main element of the powder A, element EBIs the main element of powder B.
Step three, scanning the element energy spectrum surface of the sample surface through a scanning electron microscope, and setting an element E on a software interface attached to the energy spectrum analyzerAFor a first color, element E is setBThe second color, the first color and the second color are three primary colors of two different colors. The three-color is RGB, so that the image processing software can distinguish two elements conveniently, colored particles can be extracted conveniently, and the colored particles can be distinguished from a background area conveniently.
Step four, obtaining element E in the sample under the same view fieldAFIG. A shows the spectrum of the sampleBIn the spectrum fig. b and in the color picture fig. c, wherein the color picture fig. c simultaneously corresponds to the element EAAnd element EBAnd (4) coloring.
Step five, judging whether the dust particles in the color photo figure FIG. C are completely colored, if so, entering step six; and if not, adjusting the shooting position of the scanning electron microscope, selecting the adjacent area, and repeating the step four until the powder particles in the fig. C are completely colored.
Step six, processing the energy spectrum photo fig. A through image processing software to obtain an element E in the energy spectrum photo fig. AATotal pixel area SAThe method specifically comprises the following steps:
s61, if powder B does not contain element EAPicking up and selecting the coloring area in the energy spectrum photo fig. A until all non-background colors are selected, and acquiring the total pixel area S of the coloring area by utilizing the recording measurement function in the image processing softwareA；
S62, if powder B contains element EAAll the colored areas in the energy spectrum fig. a are picked up and selected, after which the element E in the color photograph fig. c is taken as the basisBInterference pixels in the spectral photo Fig.A are removed corresponding to the positions of the powder particles, and a colored area with the interference pixels removed is obtained by utilizing the recording and measuring functions in image processing softwareTotal pixel area S of domainA。
Step seven, processing the energy spectrum photo fig. B through image processing software to obtain an element E in the energy spectrum photo fig. BBTotal pixel area SBThe method specifically comprises the following steps:
s71, if powder A does not contain element EBPicking up and selecting the coloring area in the energy spectrum photo fig. B until all non-background colors are selected, and acquiring the total pixel area S of the coloring area by utilizing the recording measurement function in the image processing softwareB；
S72, if powder A contains element EBThen all the colored areas in the energy spectrum fig. b are picked up and selected, after which the element E in the colour photograph fig. c is taken as the basisAInterference pixels in the spectral photo Fig.B are removed corresponding to the positions of the powder particles, and the total pixel area S of the coloring area after the interference pixels are removed is obtained by utilizing the recording and measuring function in the image processing softwareB。
Step eight, calculating to obtain an actually measured mixture ratio η of the mixed powder;
where ρ isAApparent density of powder A, pBIs the apparent density of powder B, mAIs the total mass of powder A, mBIs the total mass of powder B, nANumber of particles of powder A in FIG. C, nBThe number of particles of powder B in fig. c,
the average diameter of the powder particles provided by the manufacturer of powder a,
the average diameter of the powder particles, μ being the pixel scale,
in S61, a coloring area in the energy spectrum photo fig.A is picked up by using a color sampling suction pipe +; in S62, a color sampling pipette is used to pick up and remove interfering pixels in the spectral photo fig. In S71, a coloring area in the energy spectrum photo fig.B is picked up by using a color sampling suction pipe +; in S72, a color sampling pipette is used to pick up and remove interfering pixels in the spectral photo fig.
The image processing software is Photoshop or FlantR.
And fif.A of the energy spectrum photo in the sixth step is a png lossless compression format picture.
And f, the energy spectrum photo Fig.B in the step seven is a png lossless compression format picture.
Example 1
Aiming at the Ni-Fe functional gradient material at the supporting position of a rotor IN a section of a cylinder body of a million-kilowatt nuclear turbine produced by Shanghai electric group Shanghai steam turbine factory, the Ni-Fe functional gradient material is prepared by adopting a laser deposition process, namely, raw material powder A is IN625 nickel powder, powder B is 304L iron powder, and the Ni-Fe functional gradient material is prepared by mixing the following raw materials IN a design mass ratio of 1: 3 weighing and mixing, and measuring the actual powder ratio after 3D printing and spraying.
The invention provides a method for actually measuring the proportion of mixed powder in 3D printing, which has the specific flow shown in figure 1 and comprises the following operations:
1) fixing an acrylic plate 6 with a release film on a 3D printing workbench 8, adhering a double-sided adhesive tape 5 on the surface of the acrylic plate 6, then pouring colorless and transparent epoxy resin A adhesive and B adhesive into a 240ml transparent disposable plastic cup (the plastic cup does not chemically react with epoxy resin 4) according to the proportion of 2:1, uniformly mixing the two adhesives by using a stirring rod, tearing off the surface layer of the double-sided adhesive tape 5, uniformly coating the epoxy resin 4 on the surface of the double-sided adhesive tape by using a flat brush with the width of 5mm, and controlling the thickness of the epoxy resin 4 to be not more than 1 mm;
2) programming an industrial mechanical arm provided with a coaxial optical internal powder feeding laser head 3, setting the length L of a moving track 7 to be 0.5m, adjusting the powder feeding rate to be 8g/min, the scanning speed to be 8mm/s, setting the vertical distance (spraying distance) between a laser nozzle and the surface of an acrylic plate 6 to be 18.5mm, then opening an argon gas and a powder feeding hopper 1, keeping a laser beam closed, moving the laser beam according to the preset track 7 for 0.5m, spraying mixed powder 9 onto the acrylic plate 6 adhered with epoxy resin glue 4 through a powder pipe 2, and then drying the acrylic plate 6 adhered with the mixed powder layer in the shade until the liquid epoxy resin glue 4 is completely cured;
3) aiming at the acrylic plate 6 containing powder, a cutting machine is used for cutting a 1 cm-1 cm size, a tool tip is used for uniformly uncovering and tearing off the release film below the powder from the acrylic plate 6, the release film is ensured not to wrinkle in the process, a detection sample is obtained, then gold spraying treatment is carried out on the detection sample, the detection sample is fixed with a copper sheet by using conductive adhesive, and the detection sample is placed in a scanning electron microscope vacuum chamber.
TABLE 1
Table 1 shows the chemical element composition tables attached to the shipment of powder A and powder B. According to Table 1, the main element E of the powder A was selectedANi, main element E of powder BBAnd (3) scanning the element energy spectrum surface of the sample powder surface by using a scanning electron microscope (the model of the scanning electron microscope is German Zeiss EVO18 or Hitachi JSM-7800F), and setting the element Ni as blue and the element Fe as green on an attached software interface of the energy spectrum analyzer. Respectively picking up and shooting an energy spectrum photo 13 of the element Ni, an energy spectrum photo 15 of the element Fe and a real object color photo 14 of the element Ni and the element Fe existing in the mixed powder in the same visual field;
4) judging whether the powder particles in the mixed powder object color photograph 14 are completely colored, wherein all the powder particles are completely colored, so that the next step is carried out;
5) importing an energy spectrum photo 13 with a main element of Ni into image processing software Photoshop CS6, adjusting the photo to 100%, clicking a main menu ' selection ', starting an image processing software ' color range ' module, setting the color tolerance to be 100%, picking up and selecting colored particles in the energy spectrum photo by using a color sampling suction pipe, performing multiple overlapping pickup by using the color sampling suction pipe + ' due to the fact that powder B contains 10.1% of nickel elements until all non-background colors are selected, observing the positions of the powder particles corresponding to the element Ni in the color image 14, picking up the RGB values of the positions corresponding to interference pixels 12 of the powder A by using a ' suction pipe- ' tool, and eliminating the interference pixels;
6) acquiring the total area S of the Ni element pixels in the photo 13 in the step five by utilizing the functions of analyzing and recording and measuring in an image processing software Photoshop CS6 main menu image moduleAIs 6436;
7) importing the energy spectrum photo 15 with the main element of Fe into image processing software Photoshop CS6, repeating the step 5) and the step 6), and acquiring the total pixel area S of the Fe element in the energy spectrum photo 15B21640;
8) substituting the apparent densities and average particle diameters of the powder A and the powder B shown in the table 2 according to a formula to calculate the actually measured mixture ratio η of the mixed powder to be 0.299;
TABLE 2
In order to verify the effect of the test method, the diameter of the powder particles in the mixed powder substance color photograph 14 is measured one by using an image measurement software Digimizer, the mass ratio of the mixed powder is calculated to be 0.312 after the sum of the converted volumes, and the error is only 4.3% when the mixed powder substance is compared with the actually measured ratio of 0.299 obtained in the embodiment. Obviously, compared with the mode of measuring the diameters of the powder particles in the mixed powder object color photo 14 one by using the measuring software Digimizer, the testing method provided by the invention is much faster, more convenient and faster, and can reduce manpower and improve working efficiency.
The result shows that the method for actually measuring the ratio of the 3D printing mixed powder is effective, accurate in result and high in efficiency.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The actual measurement method for the ratio of the 3D printing mixed powder is characterized by comprising the following steps of:
step one, obtaining a sample with mixed powder, wherein the mixed powder comprises powder A and powder B;
step two, selecting the element E with the largest difference of chemical compositions of the powder A and the powder BAAnd EBWherein, element EAIs the main element of the powder A, element EBIs the main element of powder B;
step three, scanning the element energy spectrum surface of the sample surface through a scanning electron microscope, and setting an element E on a software interface attached to the energy spectrum analyzerAFor a first color, element E is setBA second color, the first color and the second color being three primary colors of two different colors;
step four, obtaining element E in the sample under the same view fieldAFIG. A shows the spectrum of the sampleBIn the spectrum fig. b and in the color picture fig. c, wherein the color picture fig. c simultaneously corresponds to the element EAAnd element EBColoring;
step five, judging whether the dust particles in the color photo figure FIG. C are completely colored, if so, entering step six; if not, adjusting the shooting position of the scanning electron microscope, selecting a neighboring area, and repeating the step four until the powder particles in the fig. C are completely colored;
step six, processing the energy spectrum photo fig. A through image processing software to obtain an element E in the energy spectrum photo fig. AATotal pixel area SAThe method specifically comprises the following steps:
s61, if powder B does not contain element EAPicking up and selecting the colored area in the energy spectrum photo fig. a until all non-background colors are selected, and utilizing record measurement in the image processing softwareFunction of obtaining the total area S of pixels of a colored regionA；
S62, if powder B contains element EAAll the colored areas in the energy spectrum fig. a are picked up and selected, after which the element E in the color photograph fig. c is taken as the basisBInterference pixels in the spectral photo Fig.A are removed corresponding to the positions of the powder particles, and the total pixel area S of the coloring area after the interference pixels are removed is obtained by utilizing the recording and measuring function in the image processing softwareA；
Step seven, processing the energy spectrum photo fig. B through image processing software to obtain an element E in the energy spectrum photo fig. BBTotal pixel area SBThe method specifically comprises the following steps:
s71, if powder A does not contain element EBPicking up and selecting the coloring area in the energy spectrum photo fig. B until all non-background colors are selected, and acquiring the total pixel area S of the coloring area by utilizing the recording measurement function in the image processing softwareB；
S72, if powder A contains element EBThen all the colored areas in the energy spectrum fig. b are picked up and selected, after which the element E in the colour photograph fig. c is taken as the basisAInterference pixels in the spectral photo Fig.B are removed corresponding to the positions of the powder particles, and the total pixel area S of the coloring area after the interference pixels are removed is obtained by utilizing the recording and measuring function in the image processing softwareB；
Step eight, calculating to obtain an actually measured mixture ratio η of the mixed powder;
where ρ isAApparent density of powder A, pBIs the apparent density of powder B, mAIs the total mass of powder A, mBIs the total mass of powder B, nANumber of particles of powder A in FIG. C, nBThe number of particles of powder B in fig. c,
is prepared from flourThe manufacturer of powder a provides the average diameter of the powder particles,
the average diameter of the powder particles, μ being the pixel scale,
2. the method for actually measuring the mixture ratio of the 3D printed mixed powder according to claim 1, wherein in S61, a color sampling pipette + is used to pick up a coloring area in a spectrum photo Fig.A.
3. The method for actually measuring the mixture ratio of the 3D printed mixed powder according to claim 1, wherein in S62, interference pixels in the spectrum photo Fig.A are picked and removed by using a color sampling straw- ".
4. The 3D printing mixed powder ratio actual measurement method according to claim 1, wherein the first step specifically comprises:
s11, fixing an acrylic plate on a workbench of the 3D printer, wherein a release film is arranged on the upper surface of the acrylic plate, and a double-sided adhesive layer and a liquid-state cycloaliphatic adhesive layer are sequentially arranged on the release film;
s12, loading the mixed powder into a powder feeding hopper of a 3D printer, opening the powder feeding hopper, keeping a laser beam closed, enabling a 3D printing laser nozzle to spray the powder towards the acrylic plate to obtain the acrylic plate covering the mixed powder layer, and then standing and cooling until the liquid epoxy resin glue is solidified;
and S13, sampling, cleaning and drying the mixed powder layer adhered to the acrylic plate to obtain a sample.
5. The method for actually measuring the mixture ratio of the 3D printing mixed powder according to claim 4, wherein in S12, the 3D printing laser nozzle is of a coaxial powder feeding type.
6. The 3D printing mixed powder ratio actual measurement method according to claim 1, wherein the image processing software is Photoshop.
7. The 3D printing mixed powder ratio actual measurement method according to claim 1, wherein the image processing software is FlauntR.
8. The 3D printing mixed powder ratio actual measurement method according to claim 1, wherein the energy spectrum photo FIG. A in the sixth step is a png lossless compression format picture.
9. The 3D printing mixed powder ratio actual measurement method according to claim 1, wherein the energy spectrum photo FIG. B in the seventh step is a png lossless compression format picture.
10. The method for actually measuring the mixture ratio of the 3D printed mixed powder according to claim 1, wherein in S71, a coloring area in a spectrum photo Fig.B is picked up by using a color sampling pipette +; in S72, a color sampling pipette is used to pick up and remove interfering pixels in the spectral photo fig.
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