CN114734057A - Laser melting 3d printing method based on metal powder - Google Patents
Laser melting 3d printing method based on metal powder Download PDFInfo
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- CN114734057A CN114734057A CN202210435347.3A CN202210435347A CN114734057A CN 114734057 A CN114734057 A CN 114734057A CN 202210435347 A CN202210435347 A CN 202210435347A CN 114734057 A CN114734057 A CN 114734057A
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- 239000000843 powder Substances 0.000 title claims abstract description 178
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 64
- 239000002184 metal Substances 0.000 title claims abstract description 64
- 238000007639 printing Methods 0.000 title claims abstract description 42
- 238000002844 melting Methods 0.000 title claims abstract description 35
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000005347 demagnetization Effects 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims description 38
- 230000007480 spreading Effects 0.000 claims description 12
- 238000003892 spreading Methods 0.000 claims description 12
- 230000005672 electromagnetic field Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000007648 laser printing Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 description 24
- 238000010146 3D printing Methods 0.000 description 11
- 239000004033 plastic Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 4
- 239000002923 metal particle Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 206010044565 Tremor Diseases 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005307 ferromagnetism Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000000110 selective laser sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
-
- 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)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a laser melting 3d printing method based on metal powder, which is characterized in that a computer is adopted to divide a product into a plurality of layers along the height direction, the metal powder is paved layer by layer from bottom to top and then is printed layer by layer according to the product outline of each layer until the product is formed by adopting a laser melting mode, and the method is characterized in that the demagnetization treatment is carried out on the metal powder before the metal powder is paved and printed. The invention has the characteristics of improving the printing and manufacturing precision by demagnetizing the metal powder, better dispersing the powder and improving the smoothness of powder conveying.
Description
Technical Field
The invention relates to the technical field of additive manufacturing 3D printing, in particular to a laser melting 3D printing method based on metal powder.
Background
3D Printing belongs to one of rapid prototyping technologies, also called additive manufacturing; the method is a technology for constructing an object by stacking, bonding and molding materials such as plastic, metal, ceramic powder and the like layer by using a laser, a hot melting nozzle and the like on the basis of a digital model. In recent years, 3D printing technology has been widely used in many fields such as industrial design, jewelry, automobiles, aerospace, dental and medical industries, education, and the like. At present, common 3D printers comprise a plurality of types such as selective laser melting SLM, selective laser sintering SLS, three-dimensional powder bonding and fused deposition modeling FDM.
With the development of scientific technology, the mechanical processing industry is continuously developed. The rapid prototyping technology, especially the laser 3D printing technology, plays an increasingly important role in the mechanical processing industry, and is gradually widely used in the manufacturing industry, becoming an indispensable part of the mechanical manufacturing industry today. 3D printing technology is rapidly changing traditional production modes and living modes, and many experts think that 3D printing manufacturing technology characterized by digitalization, networking, individualization and customization will promote the third industrial revolution. The metal 3D printer can be used for printing metal parts, the common printing technology at present is selective laser melting (melting), various metal powders are subjected to high-temperature laser melting molding, LSM for short, and many different metal powders can be melted and molded, such as stainless steel, cobalt-chromium alloy, titanium alloy, die steel, precious metal and other metal powders.
The existing SLM printing technology has the defect of low printing precision when powder is metal powder.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: provided is a metal powder-based laser melting 3D printing method which can improve the laser melting 3D printing manufacturing precision of metal powder.
In order to solve the technical problems, the invention adopts the following technical scheme:
a laser melting 3d printing method based on metal powder is characterized in that a computer is adopted to divide a product into a plurality of layers in the height direction, the metal powder is paved layer by layer from bottom to top and then printed layer by layer according to the product outline of each layer until the product is formed, and the method is characterized in that the demagnetization treatment is carried out on the metal powder before the metal powder is paved and printed.
The applicant researches and discovers that the printing precision of the metal powder is difficult to improve, and most of reasons are that when metal powder components with strong ferromagnetism or easy charging exist in the metal powder, certain electromagnetic characteristics are easy to present due to the fact that the metal powder components carry charges and the like in the conveying and mixing processes. In the powder spreading and laser melting process during printing, the uniform melting effect of metal particles is easily influenced due to the polymerization performance of the metal particles generated by electromagnetic characteristics, and meanwhile, the energy level transition effect of metal electrons absorbing laser energy is also influenced due to the existence of electromagnetic force, so that the 3D printing forming precision is greatly influenced. Therefore, in the scheme, the metal powder is demagnetized before being laid and printed. The polymerization force among the powder caused by the electromagnetic property is destroyed, the influence of the phenomenon on the laser printing process is eliminated, and the laser melting printing precision can be better improved. The forming quality of the product is improved.
Further, the demagnetization treatment is realized by applying an alternating-current pulse electromagnetic field to the metal powder.
The mode of the alternating-current pulse electromagnetic field is adopted for demagnetization, and under the interference of the alternating-current pulse magnetic field, the internal magnetic field structure of the metal powder magnet can be disorganized to realize demagnetization, so that the demagnetization device has the characteristics of convenience and simplicity in operation and excellent demagnetization effect.
Further, the method is realized by adopting laser melting 3d printing equipment, the laser melting 3d printing equipment comprises a forming cylinder device, a laser printing device and a powder spreading device which can be connected and matched, the input end of the powder spreading device is connected with a powder feeding box, and a demagnetizing device is arranged in the powder feeding box.
The forming cylinder device, the printing device and the powder spreading device are mature prior art and are not described in detail, and the innovation point is that a demagnetizing device is arranged in a powder feeding box of the powder spreading device. Thus, when the printing material is metal powder, the demagnetization can be realized by the demagnetization device. The influence of the electromagnetic property carried by the metal powder on the printing process is avoided, and the printing precision is improved.
Furthermore, a powder containing cavity is arranged in the powder feeding box, the demagnetizing device comprises a demagnetizing rod positioned in the powder containing cavity, a demagnetizing coil is arranged in the demagnetizing rod, and the demagnetizing coil is connected with an alternating current pulse controller on the powder feeding box.
Therefore, the alternating-current pulse controller can be used for conveniently controlling the degaussing rod to generate an alternating-current pulse electromagnetic field, the internal magnetic field of the metal powder magnet can be disordered quickly and efficiently, and the degaussing effect is realized.
Furthermore, a magnetic detector is arranged in the powder feeding box.
Thus, the demagnetization effect of the demagnetization device can be detected and confirmed.
Furthermore, the shell of the demagnetizing rod is made of iron materials, and a plurality of convex spikes are distributed on the outer part of the demagnetizing rod.
Therefore, the effect of the electromagnetic field can be better released by the convex sharp thorn of the shell of the demagnetizing rod, so as to improve the demagnetizing effect.
Furthermore, a stirring device is arranged in the air supply box.
Thus, the demagnetizing effect is uniformly realized through stirring.
Furthermore, the degaussing rod is horizontally arranged at the lower part of the powder containing cavity, the stirring device is positioned above the degaussing rod, the stirring device is provided with a driving shaft which is horizontally arranged and a stirring rod which is vertical to the driving shaft, and the driving shaft is connected with the driving motor.
Like this, the powder can reach the bottom through the stirring better and realize the demagnetization under the effect of stirring and gravity, improves stirring demagnetization effect and efficiency better.
Further, among the agitating unit, vertical fixed being provided with a plurality of corotation puddlers of arranging along the axial in the drive shaft, still install the reversal puddler along vertical between the adjacent corotation puddler, be fixed with the driving gear in the just right drive shaft of reversal puddler, driving gear and intermediate gear meshing, intermediate gear and an outer ring gear meshing, the reversal puddler is fixed on outer ring gear periphery wall, outer ring gear both sides lateral wall is provided with annular connecting plate, the drive shaft rotationally passes the connecting plate and installs the driving gear, intermediate gear's pivot slidable ground sets up in the annular spout of connecting plate inside wall.
Like this, the drive shaft rotates and to drive corotation puddler corotation, simultaneously through the transmission of intermediate gear and outer ring gear, can drive the reversal (mixing) shaft reversal, can greatly improve the effect of stirring, when driving metal powder and reacing demagnetizer, can stir the powder better, avoids the material to pile up the caking in the inside production of holding powder case and produce and harden, influence the availability factor.
Further, coaxial cover is equipped with a connecting cylinder outside the drive shaft, and the connecting cylinder still includes a plurality of corotation sections that link to each other with the corotation puddler and a plurality of reversal sections that link to each other with the reversal puddler including being located both ends and fixing the canned paragraph on flourishing powder intracavity wall, and adjacent tip position between canned paragraph, corotation section and the reversal section realizes sealing the cooperation through joint structure slidable.
Therefore, the driving shaft and the transmission gear structure in the connecting cylinder can be better protected, and blockage caused by powder entering is avoided.
Further, a driving motor of the driving shaft is installed in the fixed section.
Thus, the installation and protection of the motor are convenient.
Furthermore, a powder containing box is movably arranged in the powder feeding box, the inner cavity of the powder containing box is the powder containing cavity, the lower end of the powder containing box is placed and installed on a supporting plate capable of sliding up and down, a cam is arranged in the middle of the lower portion of the supporting plate in an abutting mode, and the cam is in transmission connection with a cam motor.
Like this, through cam gear, can drive the layer board and vibrate from top to bottom, in the powder transportation process, the powder can tremble through the vibration when the mode card is stifled on agitating unit. In the stirring process, the stirring effect can also be improved through vibration. When the powder feeding box is implemented, the peripheral sides of the supporting plates can be arranged in the sliding grooves on the inner wall of the powder feeding box in a vertically sliding mode, so that the supporting plates can slide vertically conveniently.
Furthermore, the upper end of the powder containing box is connected with a feeding hose and is connected to the outside of the powder feeding box, and the lower end of the powder containing box is connected with a discharging hose and is connected to the outside of the powder feeding box.
Thus, the powder feeding box is convenient to feed and discharge materials.
In addition, when the powder feeding box is implemented, the front end of the powder feeding box is provided with a master controller, and the alternating current pulse controller, the magnetic detection device, the driving motor and the cam motor are respectively connected with the master controller. Thus, electrical control is conveniently realized. When the intelligent control system is implemented, an operation panel and an indicator lamp are arranged on the master controller, the operation panel is used for controlling adjustment of analyzed parameters, and the indicator lamp is divided into red and green.
Furthermore, the front ends of the powder feeding box and the powder containing box are also provided with observation windows. The internal condition is conveniently observed, and preferably, the observation window is made of a transparent acrylic plate.
Therefore, in the device, the pulse controller is used for releasing pulse current to the inside of the demagnetizing rod, the demagnetizing of the plastic powder is realized, the stirring mechanism is used for realizing the movement of the plastic powder, the demagnetizing efficiency is improved, meanwhile, the magnetic detection block is used for realizing the monitoring of the plastic powder, the demagnetizing work of the plastic powder is completed, meanwhile, the driving motor is started to drive the cam to rotate, the vertical movement of the powder containing box is realized, the plastic powder is driven to shake in the powder containing box, and the demagnetizing efficiency is improved.
In conclusion, the invention has the characteristics of improving the printing and manufacturing precision by demagnetizing the metal powder, and simultaneously better dispersing the powder and improving the smoothness of powder conveying.
Drawings
FIG. 1 is a schematic diagram of a single powder feed bin in a laser melting 3d printing apparatus used in the practice of the present invention.
Fig. 2 is a schematic view of the internal structure of fig. 1.
Fig. 3 is a schematic view of the structure of the single stirring device in fig. 1.
Fig. 4 is a schematic structural diagram of a joint of a single reverse stirring rod in the powder feeding box of fig. 1.
Fig. 5 is an enlarged view of a structure shown in fig. 3.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The specific implementation mode is as follows: a laser melting 3d printing method based on metal powder is characterized in that a computer is adopted to divide a product into a plurality of layers along the height direction, the metal powder is paved layer by layer from bottom to top and then printed layer by layer according to the product outline of each layer until the product is formed, and the method is characterized in that the demagnetization treatment is carried out on the metal powder before the metal powder is paved and printed.
The applicant researches and discovers that the printing precision of the metal powder is difficult to improve, and most of reasons are that when metal powder components with strong ferromagnetism or easy charging exist in the metal powder, certain electromagnetic properties are easy to be presented due to the fact that the metal powder components carry charges and the like in the conveying and mixing processes. In the powder spreading and laser melting process during printing, the uniform melting effect of metal particles is easily influenced due to the polymerization performance of the metal particles generated by electromagnetic characteristics, and meanwhile, the energy level transition effect of metal electrons absorbing laser energy is also influenced due to the existence of electromagnetic force, so that the 3D printing forming precision is greatly influenced. Therefore, in the scheme, the metal powder is demagnetized before being laid and printed. The polymerization force among the powder caused by the electromagnetic property is destroyed, the influence of the phenomenon on the laser printing process is eliminated, and the laser melting printing precision can be better improved. The forming quality of the product is improved.
Wherein, the demagnetization treatment is realized by applying an alternating-current pulse electromagnetic field to the metal powder.
The mode of the alternating-current pulse electromagnetic field is adopted for demagnetization, and under the interference of the alternating-current pulse magnetic field, the internal magnetic field structure of the metal powder magnet can be disorganized to realize demagnetization, so that the demagnetization device has the characteristics of convenience and simplicity in operation and excellent demagnetization effect.
When the method is specifically implemented, the laser melting 3d printing equipment is adopted, the laser melting 3d printing equipment comprises a forming cylinder device, a laser printing device and a powder spreading device which can be connected and matched, the input end of the powder spreading device is connected with a powder feeding box, and a demagnetizing device is arranged in the powder feeding box.
The forming cylinder device, the printing device and the powder spreading device are mature prior art and are not described in detail, and the innovation point is that a demagnetizing device is arranged in a powder feeding box of the powder spreading device. Thus, when the printing material is metal powder, the demagnetization can be realized by the demagnetization device. The influence of the electromagnetic property carried by the metal powder on the printing process is avoided, and the printing precision is improved.
Specifically, referring to fig. 1-5, the powder feeding box 1 is provided with a powder containing cavity, the demagnetizing device comprises a demagnetizing rod 10 positioned in the powder containing cavity, a demagnetizing coil is arranged in the demagnetizing rod, and the demagnetizing coil is connected with an alternating current pulse controller 2 on the powder feeding box 1.
Therefore, the alternating-current pulse controller can conveniently control the degaussing rod to generate an alternating-current pulse electromagnetic field, the internal magnetic field of the metal powder magnet can be quickly and efficiently disturbed, and the degaussing effect is realized.
Wherein, a magnetic detector 9 is also arranged in the powder feeding box.
Thus, the demagnetization effect of the demagnetization device can be detected and confirmed.
Wherein, demagnetization pole 10 shell is the iron material, and demagnetization pole 10 outside distribution is provided with a plurality of bellied spines.
Therefore, the effect of the electromagnetic field can be better released by the convex sharp thorn of the shell of the demagnetizing rod, so as to improve the demagnetizing effect.
Wherein, a stirring device is also arranged in the air supply box.
Thus, the demagnetizing effect is uniformly realized through stirring.
Wherein, degaussing pole horizontal setting is in flourishing powder chamber lower part, and agitating unit is located the degaussing pole top, and agitating unit 8 has the drive shaft of horizontal setting and the puddler of perpendicular to the drive shaft, and the drive shaft links to each other with driving motor 86.
Like this, the powder can reach the bottom through the stirring better and realize the demagnetization under the effect of stirring and gravity, improves stirring demagnetization effect and efficiency better.
Wherein, among the agitating unit 8, vertical fixed being provided with a plurality of corotation puddlers 82 of arranging along the axial on the drive shaft 81, still install the reversal puddler 83 along vertical between the adjacent corotation puddler, be fixed with the driving gear 854 on the just right drive shaft of reversal puddler, driving gear and the meshing of intermediate gear 852, intermediate gear and the meshing of an outer ring gear, the reversal puddler is fixed on outer ring gear periphery wall, outer ring gear both sides lateral wall is provided with annular connection 851 board, the drive shaft rotationally passes the connecting plate and installs the driving gear, intermediate gear's pivot slidable ground sets up in the annular spout 853 of connecting plate inside wall. The drive gear, the intermediate gear and the external gear ring thus constitute a counter-rotating transmission 85.
Like this, the drive shaft rotates and to drive corotation puddler corotation, simultaneously through the transmission of intermediate gear and outer ring gear, can drive the reversal (mixing) shaft reversal, can greatly improve the effect of stirring, when driving metal powder and reacing demagnetizer, can stir the powder better, avoids the material to pile up the caking in holding the inside production of powder case and produce and harden, influences the availability factor.
Wherein, the outer coaxial cover of drive shaft is equipped with a connecting cylinder, and the connecting cylinder still includes a plurality of corotation sections that link to each other with the corotation puddler and a plurality of reversal sections 84 that link to each other with the reversal puddler including being located both ends and fixing the canned paragraph on flourishing powder intracavity wall, and adjacent tip position between canned paragraph, corotation section and the reversal section realizes sealing the cooperation through joint structure 87 slidable.
Therefore, the driving shaft and the transmission gear structure in the connecting cylinder can be better protected, and blockage caused by powder entering is avoided.
Wherein the drive motor 86 of the drive shaft is mounted in the fixed section.
Thus, the installation and protection of the motor are convenient.
The powder feeding box 1 is movably provided with a powder containing box 12, the inner cavity of the powder containing box 12 is the powder containing cavity, the lower end of the powder containing box is arranged on a supporting plate 11 capable of sliding up and down, the middle part of the lower part of the supporting plate 11 is provided with a cam 41 in an abutting mode, and the cam is in transmission connection with a cam motor 42 to form the vibrating device 4.
Like this, through cam gear, can drive the layer board and vibrate from top to bottom, in the powder transportation process, the powder can tremble through the vibration when the mode card is stifled on agitating unit. In the stirring process, the stirring effect can also be improved through vibration. When the powder feeding box is implemented, the peripheral side of the supporting plate can be arranged in the chute 7 of the inner wall of the powder feeding box in a vertically sliding manner, so that the supporting plate can slide vertically conveniently.
Wherein, flourishing powder case upper end is connected with feeding hose 6 and is connected to the powder feeding case outside, flourishing powder case lower extreme is connected with ejection of compact hose 3 and is connected to the powder feeding case outside.
Thus, the powder feeding box is convenient to feed and discharge materials.
In addition, when the powder feeding box is implemented, the front end of the powder feeding box is provided with a master controller 5, and the alternating current pulse controller 2, the magnetic detection device, the driving motor and the cam motor are respectively connected with the master controller 5. Thus, electrical control is conveniently realized. When the intelligent control system is implemented, an operation panel and an indicator lamp are arranged on the master controller, the operation panel is used for controlling adjustment of analyzed parameters, and the indicator lamp is divided into red and green.
Wherein, the front ends of the powder feeding box and the powder containing box are also provided with observation windows. The internal condition is conveniently observed, and preferably, the observation window is made of a transparent acrylic plate.
Therefore, in the device, the pulse controller is used for releasing pulse current to the inside of the demagnetizing rod, the demagnetizing of the plastic powder is realized, the stirring mechanism is used for realizing the movement of the plastic powder, the demagnetizing efficiency is improved, meanwhile, the magnetic detection block is used for realizing the monitoring of the plastic powder, the demagnetizing work of the plastic powder is completed, meanwhile, the driving motor is started to drive the cam to rotate, the vertical movement of the powder containing box is realized, the plastic powder is driven to shake in the powder containing box, and the demagnetizing efficiency is improved.
Claims (10)
1. A laser melting 3d printing method based on metal powder is characterized in that a computer is adopted to divide a product into a plurality of layers in the height direction, the metal powder is paved layer by layer from bottom to top and then printed layer by layer according to the product outline of each layer until the product is formed, and the method is characterized in that the demagnetization treatment is carried out on the metal powder before the metal powder is paved and printed.
2. The metal powder based laser melting 3d printing method of claim 1, wherein the degaussing treatment is achieved by applying an alternating pulsed electromagnetic field to the metal powder.
3. The metal powder-based laser melting 3d printing method according to claim 2, wherein the method is implemented by using a laser melting 3d printing apparatus, the laser melting 3d printing apparatus comprises a forming cylinder device, a laser printing device and a powder spreading device which can be connected and matched, an input end of the powder spreading device is connected with a powder feeding box, and a demagnetizing device is arranged in the powder feeding box.
4. The laser melting 3d metal powder-based printing method of claim 3, wherein the powder feeding box has a powder containing cavity therein, the degaussing device comprises a degaussing rod located in the powder containing cavity, the degaussing rod has a degaussing coil therein, and the degaussing coil is connected with an alternating current pulse controller on the powder feeding box.
5. The laser melting 3d printing method based on metal powder as claimed in claim 4, wherein a magnetic detector is further arranged in the powder feeding box;
the shell of the degaussing rod is made of iron materials, and a plurality of convex spines are distributed on the outer portion of the degaussing rod.
6. The metal powder based laser melting 3d printing method of claim 4, wherein an agitating device is further provided in the air box.
7. The metal powder-based laser melting 3d printing method as claimed in claim 6, wherein the degaussing rod is horizontally arranged at the lower part of the powder containing chamber, the stirring device is arranged above the degaussing rod, the stirring device is provided with a driving shaft which is horizontally arranged and a stirring rod which is perpendicular to the driving shaft, and the driving shaft is connected with the driving motor.
8. The metal powder-based laser melting 3d printing method as recited in claim 7, wherein in the stirring device, a plurality of forward rotation stirring rods are vertically and fixedly arranged on a driving shaft, the forward rotation stirring rods are vertically arranged between adjacent forward rotation stirring rods, a reverse rotation stirring rod is vertically arranged between adjacent forward rotation stirring rods, a driving gear is fixed on the driving shaft opposite to the reverse rotation stirring rod, the driving gear is meshed with an intermediate gear, the intermediate gear is meshed with an outer gear ring, the reverse rotation stirring rod is fixed on the outer peripheral wall of the outer gear ring, annular connecting plates are arranged on the side walls of the two sides of the outer gear ring, the driving shaft rotatably penetrates through the connecting plates and is provided with the driving gear, and a rotating shaft of the intermediate gear is slidably arranged in an annular chute on the inner side wall of the connecting plates;
the connecting cylinder comprises fixing sections which are positioned at two ends and fixed on the inner wall of the powder containing cavity, a plurality of forward rotation sections connected with the forward rotation stirring rods and a plurality of reverse rotation sections connected with the reverse rotation stirring rods, and the adjacent end parts among the fixing sections, the forward rotation sections and the reverse rotation sections are in close fit through a slidable clamping structure;
the driving motor of the driving shaft is arranged in the fixed section.
9. The laser melting 3d printing method based on metal powder as claimed in claim 4, wherein a powder containing box is movably arranged in the powder feeding box, the inner cavity of the powder containing box is the powder containing cavity, the lower end of the powder containing box is arranged on a supporting plate capable of sliding up and down, a cam is arranged in the middle of the lower portion of the supporting plate in an abutting mode, and the cam is in transmission connection with a cam motor.
10. The laser melting 3d metal powder-based printing method of claim 9, wherein a feeding hose is connected to an upper end of the powder containing tank and connected to the outside of the powder feeding tank, and a discharging hose is connected to a lower end of the powder containing tank and connected to the outside of the powder feeding tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210435347.3A CN114734057B (en) | 2022-04-24 | Laser melting 3d printing method based on metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210435347.3A CN114734057B (en) | 2022-04-24 | Laser melting 3d printing method based on metal powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114734057A true CN114734057A (en) | 2022-07-12 |
| CN114734057B CN114734057B (en) | 2024-06-21 |
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