CN114309666A - Electron beam 3D prints two powder feeding mechanism based on preparation of gradient functional material - Google Patents
Electron beam 3D prints two powder feeding mechanism based on preparation of gradient functional material Download PDFInfo
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- CN114309666A CN114309666A CN202210013042.3A CN202210013042A CN114309666A CN 114309666 A CN114309666 A CN 114309666A CN 202210013042 A CN202210013042 A CN 202210013042A CN 114309666 A CN114309666 A CN 114309666A
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Abstract
The invention discloses an electron beam 3D printing double powder feeding mechanism based on gradient functional material preparation, which solves the problem that the gradient functional material cannot be formed due to the constant change of the component proportion of powder for printing, and comprises a powder feeding mechanism, a mixing and stirring mechanism, a vacuum transition chamber, a powder laying mechanism and a printing workbench, the powder feeding mechanism is arranged above the mixing and stirring mechanism, the vacuum transition chamber is arranged below the mixing and stirring mechanism, the powder spreading mechanism is arranged below the vacuum transition chamber, the printing workbench is arranged below the powder spreading mechanism and is connected with the powder spreading mechanism in a sliding manner, the mixing and stirring mechanism, the vacuum transition chamber and the powder spreading mechanism are connected in a sealing manner, the invention is used for melting additive manufacturing equipment in an electron beam selective area to realize the function of printing powder with two different proportions.
Description
Technical Field
The invention relates to the technical field of 3D printing equipment, in particular to an electron beam 3D printing double-powder-feeding mechanism based on gradient functional material preparation; the device is used for melting additive manufacturing equipment in an electron beam selective area to realize the function of printing powder with two different proportions.
Background
The additive manufacturing technology (AM), also known as 3D printing, is a manufacturing technology that, based on a digital model, slices the model in layers by software and a numerical control system, deposits a dedicated metallic material or non-metallic material and a medical biomaterial layer by sintering, deposition, extrusion, curing, etc. according to a generated program, and manufactures a desired entity. The technology gets rid of the process modes of cutting of a cutter and assembling of parts in the traditional manufacturing, so that the freedom degree of additive manufacturing design is large, the period is short, the manufacturing of parts with complex structures becomes possible, the technology realizes the tight combination of an information network technology, an advanced material technology and a digital intelligent manufacturing technology, and the technology is an important component of the advanced manufacturing industry.
The selective Melting technology is divided into a selective Melting technology (SEBM) of Electron beams, in which Electron beams are excited by a tungsten filament and accelerated by a high-voltage electrode, and the Electron beams are focused and scanned by an electromagnetic coil and are swept on pre-paved powder according to a woven path so as to melt, bond and form metal powder. The forming steps are as follows: (1) firstly, a three-dimensional CAD model to be printed is established in drawing software. (2) And then importing the three-dimensional model into model processing software to design a workbench and perform layered slicing of the model to obtain discrete data. (3) And importing the data information into selective electron beam melting forming equipment for processing. (4) Scanning and preheating the stainless steel outer-layer titanium-plated formed substrate by using electron beams with larger electrons to reach the set temperature of the used material. (5) The motor drives the powder scraping target teeth to spread powder according to a program, and the powder is preheated by a large-current and quick electron beam. (6) And then reducing the scanning speed and the beam intensity to carry out scanning selective melting molding on a given forming area so as to combine powder metallurgy. And (7) after the previous layer of working procedure is finished, reducing the powder thickness by one layer and repeating the operations (5) and (6) until the parts are stacked and molded. (8) And taking out the part from the vacuum equipment after the part is formed, and blowing loose powder to a powder blowing system by using a high-pressure air gun to obtain the three-dimensional part.
The concept of the gradient functional materials (FGM) was first proposed by Xinjiang and Hejing Xiongensis, et al, Japan in 1987. FGM is a novel composite material which is compounded by two or more materials and has continuously gradient-changed components and structures, is a novel functional material which is developed to meet the requirements of high-tech fields such as modern aerospace industry and the like and can repeatedly and normally work under the limit environment. The design requirement of the device is that the function and the performance of the device change along with the change of the internal position of the machine element, and the device is satisfied by optimizing the overall performance of the component. From the structural point of view of materials, gradient functional materials are different from homogeneous materials and composite materials. The material is a material with gradient function formed by selecting two (or more) materials with different properties, and continuously changing the composition and the structure of the two (or more) materials to ensure that the interface disappears, so that the properties of the material are slowly changed along with the change of the composition and the structure of the material. From the view of material combination, FGM can be divided into various combinations of metal/alloy, metal/nonmetal, nonmetal/ceramic, metal/ceramic, ceramic/ceramic, etc., so that various materials with special functions can be obtained. Gradient structure materials, as the name implies, are transitional non-uniform structure materials that gradually change from one structure, component, or phase to another. Different from the traditional homogeneous material and multilayer composite material, the gradient structure material has a naturally transitional microstructure, and due to the characteristic, no obvious material interface exists in the gradient structure material, so that the performance sudden change caused by the structure sudden change is avoided, and the perfect unification of various excellent performances is realized due to the coordination effect among different areas in the gradient structure material. The metal is used as an object to carry out gradient structure construction, and the metal material with the gradient structure can be obtained. The gradient structure with the characteristic of non-uniform distribution is introduced into the material microstructure, so that the Archimedes' heel of the trade-off between the strength and the toughness of the metal material is effectively broken, and the strength of the material is improved while the original plastic property of the material is maintained.
Disclosure of Invention
The gradient functional material is a novel material and has very important application in the fields of aerospace and the like; the preparation method has a plurality of methods, but cannot be popularized in a large range due to the existence of various defects. According to the design, from the angle of electron beam additive manufacturing, the manufacturing process of electron beam 3D printing of the gradient functional material is realized by modifying an electron beam powder feeding mechanism, a stirring mechanism, a vacuum chamber and a powder laying mechanism.
Original shop's powder formula electron beam 3D printing apparatus because vacuum printing, and print and use the powder to be single material, so its powder box is placed in the vacuum chamber, spreads the powder through special shop's powder equipment. The printing of the gradient functional material needs the continuous change of the component proportion of the printing powder, which is a dynamic process, so that the original printing equipment can not be applied.
The invention aims to: in order to solve the problem that the proportion of printing powder components of the conventional electron beam 3D printing double-powder-feeding mechanism is continuously changed and a gradient functional material cannot be formed, the invention provides an electron beam 3D printing double-powder-feeding mechanism prepared based on the gradient functional material.
The invention specifically adopts the following technical scheme for realizing the purpose:
electron beam 3D prints two powder feeding mechanism based on preparation of gradient function material, including powder feeding mechanism, mixed rabbling mechanism, vacuum transition room, shop's powder mechanism and print the workstation, the top of mixing the rabbling mechanism has powder feeding mechanism, the below of mixing the rabbling mechanism has vacuum transition, the below of vacuum transition room has shop's powder mechanism, the below of shop's powder mechanism has print the workstation, print workstation sliding connection in shop's powder mechanism, mix rabbling mechanism, vacuum transition room and shop between the powder mechanism sealing connection.
Further, a first planetary screw and a second planetary screw which are arranged in an oblique manner are arranged above the interior of the mixing and stirring mechanism, the first planetary screw and the second planetary screw are in butt joint with a feed port of the powder feeding mechanism, a mixer valve body is arranged below the interior of the mixing and stirring mechanism, the mixer valve body is communicated with the vacuum transition chamber, the mixer valve body is provided with a mixer valve body valve core, and the mixer valve body valve core is communicated with or separates the mixing and stirring mechanism and the vacuum transition chamber.
Further, a stirring rod is arranged in the middle position above the inner part of the mixing and stirring mechanism, the stirring rod is connected with a motor arranged above the mixing and stirring mechanism, the motor is positioned on a powder feeding cover, the powder feeding cover is sealed above the powder feeding cabin, and the powder feeding cover is provided with a feeding hole of the powder feeding mechanism.
Further, the powder feeding mechanism is provided with a hopper, a roller, a screw and a speed regulating motor, the screw is positioned in the roller and is in threaded fit connection with the roller, the speed regulating motor is connected with the screw, and the roller is in butt joint with a feed port of the powder feeding mechanism.
Further, a valve core is arranged in the vacuum transition chamber, the valve core is sealed with a transition chamber valve cover and a transition chamber valve body through sealing rings, the valve core is connected with the valve rod, the valve core separates the transition chamber valve cover and the transition chamber valve body, the vacuum transition chamber is provided with an inlet and an outlet, and the inlet and the outlet are respectively connected with the mixing and stirring mechanism and the powder spreading mechanism in a sealing mode.
Further, a connecting screw rod penetrates between the transition chamber valve cover and the transition chamber valve body, and the connecting screw rod locks the transition chamber valve cover and the transition chamber valve body in a threaded mode through a nut.
Further, the powder spreading mechanism is provided with a powder spreading scraper, a powder spreading box and a base plate, the powder spreading scraper is attached to the fixed powder spreading box, the powder spreading scraper is connected with a sliding rail on the printing workbench in a sliding mode, and the base plate is laid above the printing workbench.
Further, a gap is formed between the powder spreading scraper and the substrate.
Further, a discharge hole is formed below the powder feeding mechanism and communicated with an inlet of the vacuum transition chamber through a pipeline, an outlet is formed below the vacuum transition chamber and communicated with the powder spreading mechanism through a pipeline.
The invention has the beneficial effects that:
1. according to the invention, two different powders are respectively placed in the powder cabin of the powder feeding mechanism, and the requirements of mixing the two powders in different proportions are met by controlling the different rotating speeds of the first planetary screw and the second planetary screw in the powder feeding mechanism;
2. after powder with a certain proportion is conveyed to the stirring mechanism, the powder is stirred by a stirring rod of the stirring mechanism, so that the two kinds of powder are uniformly mixed, in order to improve the accuracy of transmission, a discharge port of the double-planet conical mixer is improved, the discharge port is communicated with an inlet of a vacuum transition chamber by a pipeline, a mixer valve body is arranged at the joint, the mixer valve body is closed during stirring, the mixer valve body is opened when stirring is completed, a powder inlet cabin door of the vacuum transition chamber is opened simultaneously, the powder naturally enters the vacuum chamber under the suction of negative air pressure, and the filling and the powder outputting achieve certain automation.
3. When the stirring mechanism finishes the work, the powder outlet door of the vacuum transition chamber is closed, the powder inlet door is opened, and the powder naturally enters the vacuum chamber under the suction of negative air pressure. And then the powder inlet cabin door of the transition chamber is closed, at the moment, the atmospheric pressure is sealed in the vacuum chamber, the valve core of the vacuum chamber rotates by 90 degrees, then the powder outlet cabin door is opened, the vacuum chamber is communicated with the powder spreading box, and the powder is sucked into the powder spreading box from the vacuum chamber under the action of negative pressure.
4. The invention dynamically changes the mixing of the two kinds of powder in different proportions at any time, the powder spreading mechanism ensures the uniform powder spreading, ensures the smooth transition of each mixing ratio of the two kinds of powder, and the components of each layer of material or the material combination of the materials of each spread gradient material layer can be different.
Drawings
FIG. 1 is a schematic view of a three-dimensional connection structure according to the present invention;
FIG. 2 is a schematic side view of the mixing and stirring mechanism of the present invention;
FIG. 3 is a schematic view of another side structure of the mixing mechanism of the present invention;
FIG. 4 is a schematic structural view of a powder feeding mechanism according to the present invention;
FIG. 5 is a schematic side view of a vacuum transition chamber according to the present invention;
FIG. 6 is a schematic view of another side structure of the vacuum transition chamber according to the present invention;
FIG. 7 is a schematic perspective view of the powder spreading mechanism of the present invention;
FIG. 8 is a schematic view of the structure of the powder spreading mechanism in the viewing direction;
fig. 9-11 are schematic views of the working state of the vacuum transition chamber of the present invention.
Reference numerals: 1-powder feeding mechanism, 2-mixing stirring mechanism, 3-vacuum transition chamber, 4-powder spreading mechanism, 5-printing workbench, 6-motor, 7-powder feeding cover, 8-powder feeding cabin, 9-mixer valve body valve core, 10-stirring rod, 11-hopper, 12-roller, 13-screw, 14-first planetary screw, 15-second planetary screw, 16-mixer valve body, 17-outlet, 18-valve core, 19-sealing ring, 20-nut, 21-connecting screw, 22-inlet, 23-transition chamber valve body, 24-transition chamber valve cover, 25-powder spreading scraper, 26-powder spreading box and 27-base plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As shown in fig. 1, this embodiment provides electron beam 3D printing double powder feeding mechanism based on gradient functional material preparation, including powder feeding mechanism 1, mixing stirring mechanism 2, vacuum transition chamber 3, shop's powder mechanism 4 and print the workstation 5, mixing stirring mechanism 2's top has powder feeding mechanism 1, mixing stirring mechanism 2's below has vacuum transition chamber 3, vacuum transition chamber 3's below has shop's powder mechanism 4, shop's powder mechanism 4's below has print workstation 5, print workstation 5 sliding connection in shop's powder mechanism 4, mixing stirring mechanism 2, vacuum transition chamber 3 and shop's powder mechanism 4 between sealing connection.
As shown in fig. 2-3, a first planetary screw 14 and a second planetary screw 15 are obliquely arranged above the inside of the mixing and stirring mechanism 2, the first planetary screw 14 and the second planetary screw 15 are butted with a feed port of the powder feeding mechanism 1, a mixer valve body 16 is arranged below the inside of the mixing and stirring mechanism 2, the mixer valve body 16 is communicated with the vacuum transition chamber 3, the mixer valve body 16 is provided with a mixer valve spool 9, and the mixer valve spool 9 is communicated with or separates the mixing and stirring mechanism 2 and the vacuum transition chamber 3.
Mix the inside top intermediate position of rabbling mechanism 2 and have puddler 10, puddler 10 has connected and has in mixing the motor 6 that rabbling mechanism 2 top had, motor 6 is located powder feeder cover 7, powder feeder cover 7 seals in the top of advancing powder cabin 8, and powder feeder cover 7 has the feed inlet of powder feeder mechanism 1.
As shown in fig. 4, the powder feeding mechanism 1 includes a hopper 11, a roller 12, a screw 13 and a speed-regulating motor (shown slightly in the figure), the screw 13 is located inside the roller 12 and is in threaded fit connection with the roller 12, the speed-regulating motor is connected to the screw 13, and the roller 12 is in butt joint with the feed port of the powder feeding mechanism 1.
As shown in fig. 5-6, a valve core 18 is installed inside the vacuum transition chamber 3, the valve core 18 is sealed with a transition chamber valve cover 24 and a transition chamber valve body 23 through a sealing ring 19, the valve core 18 is connected with the valve rod 16, the valve core 18 separates the transition chamber valve cover 24 and the transition chamber valve body 23, the vacuum transition chamber 3 is provided with an inlet 22 and an outlet 17, and the inlet 22 and the outlet 17 are respectively connected with the mixing and stirring mechanism 2 and the powder spreading mechanism 4 in a sealing manner.
A connecting screw 21 penetrates between the transition chamber valve cover 24 and the transition chamber valve body 23, and the connecting screw 21 locks the transition chamber valve cover 24 and the transition chamber valve body 23 through a nut 20 in a threaded mode.
As shown in fig. 7-8, powder paving mechanism 4 has powder paving scraper 25, powder paving box 26 and base plate 27, powder paving scraper 26 is fixed and with the laminating of powder paving scraper 25, powder paving scraper 25 with slide rail sliding connection on the print table 5, base plate 27 is laid in the top of print table 5, powder paving scraper 25 with the space has between the base plate 27, the below of powder feeding mechanism 1 has the discharge gate with the entry 20 of vacuum transition room 3 is put through with the pipeline, the below of vacuum transition room 3 has export 17, export 17 with powder paving mechanism 4 passes through the pipeline and puts through.
Example 2
The powder feeding mechanism 1 is composed of a hopper 11, a roller 12, a screw 13, a speed regulating motor (additionally arranged) and other parts.
The transmission quantity is as follows: q is 47 beta phi rho D2Sn，
Wherein: in the formula: d-diameter of spiral blade (m)
S-Pitch (m)
n-rotational speed (r/min)
Beta-tilt coefficient
Phi-fill factor of material
Rho-mass per unit volume of material (t/m)3)
The filling coefficient is selected as follows:
taking phi 0.45 for the lightly polished powdery and fine granular materials with good fluidity; for the fluid medium-light polished material, Φ is 0.33, and for the very-light polished material, Φ is 0.15, the specific values are shown in table 1
TABLE 1 fill factor
The rotation of a speed regulating motor enables a screw 13 to rotate, the feeding material of a hopper 11 enters a roller 12, the feeding material is conveyed into a powder cabin 8 through a feeding hole of a powder conveying mechanism 1 through the screw 13, different conveying amounts are obtained under the condition of different rotating speeds according to the designed screw diameter, two different kinds of powder are respectively placed in the powder cabin 8 of the powder conveying mechanism 1, and the different rotating speeds of a first planetary screw 14 and a second planetary screw 15 in the powder conveying mechanism 1 are controlled, so that the requirement of mixing the two kinds of powder in different proportions is met; the motor 6 rotates the stirring rod 10 to stir the powder mixed in different proportions in the powder cabin 8.
Example 3
After the rabbling mechanism is carried to the powder of certain proportion, stir through rabbling mechanism's puddler 10, thereby with two kinds of powder misce benes, in order to improve the accurate nature of transmission, improve the discharge gate of two planet toper powder feeding mechanism 1, the discharge gate is put through with the pipeline with the entry 22 of vacuum transition chamber 3, the junction sets up mixes quick-witted valve body 16, mix quick-witted valve body 16 during the stirring and close, mix quick-witted valve body case 9 and close promptly, mix quick-witted valve body case 9 and close and open when the stirring is accomplished, the powder cabin door that advances of vacuum chamber transition chamber 3 is opened simultaneously, the powder just enters into vacuum transition chamber 3 naturally under the suction of negative pressure, it reaches certain automation to load and export the powder.
When the stirring mechanism finishes working, the powder outlet door of the vacuum transition chamber 3 is closed, namely the outlet 17 is closed, the powder inlet door is opened, namely the inlet 22 is opened, and powder naturally enters the vacuum transition chamber 3 under the suction force of negative air pressure. Then the powder inlet door of the transition chamber is closed, namely the inlet 22 is closed, at the moment, the atmospheric pressure is sealed in the vacuum chamber, the valve core 18 of the vacuum chamber rotates 90 degrees, then the powder outlet door is opened, namely the outlet 17 is opened, the interior of the vacuum transition chamber 3 is communicated with the powder spreading box 26 of the powder spreading mechanism 4, and the powder is sucked into the powder spreading box 26 from the vacuum transition chamber 3 under the action of negative pressure.
Example 4
Because the electron beam 3D printer needs to work in a vacuum environment, and printing a gradient functional material is a dynamic process, it is obviously difficult to maintain the vacuum degree after each material is replaced, and if all mechanisms are placed in a vacuum chamber, the whole mechanism is too large. The powder uniformly stirred by the mixing and stirring mechanism 2 needs to enter the powder spreading mechanism 4 in another mode, and an independent transition space needs to be designed between the vacuum environment and the atmospheric environment, so that the normal conveying of the powder with different proportions can be ensured, and the vacuum degree of a printing space is slightly reduced when the powder is fed each time, namely the vacuum transition chamber 3 is adopted.
The working principle is as shown in fig. 9-11:
at the beginning, the valve core 18 turns to the vacuumizing mechanism of the vacuum transition chamber 3 for vacuumizing, so that the chamber of the transition chamber valve cover 24 is also in a vacuum state, as shown in fig. 9, the valve core 18 turns 180 degrees later towards the mixing and stirring mechanism 2, the mixing machine valve body 16 of the discharge port is opened after the mixing and stirring mechanism 2 finishes working, the material is sucked into the valve core 18 due to the gravity and the vacuum negative pressure generated by the valve core 18, the mixing machine valve body 16 is closed as shown in fig. 10, then the valve core 18 turns 180 degrees again towards the powder paving mechanism 4 as shown in fig. 11, and the material is sucked into the powder paving mechanism 4 due to the negative pressure of the vacuum chamber, so that the problem of ensuring the vacuum degree is solved. Operation process as can be seen from fig. 10, the valve core 18 has a gap during the rotation process, and at this time, the vacuum transition chamber 3 is equivalent to be directly connected with the mixing and stirring mechanism 2, because the vacuum pump connected with the vacuum transition chamber 3 is always operated, the connecting pipeline from the vacuum transition chamber 3 to the mixing and stirring mechanism 2 will be vacuumized, and the powder will be sucked out by the negative pressure when the mixer valve body 16 at the discharge port of the mixing and stirring mechanism 2 is opened next time.
Example 5
In order to make the powder meet the requirement of top-down conveying and facilitate replacement and filling, the powder spreading box 26 and the powder spreading scraper 25 are combined to design a mechanism as shown in the figure, the powder spreading box 26 is fixed and attached to the powder spreading scraper 25, and a certain gap is left between the powder spreading scraper 25 and the substrate 27 so as to facilitate powder spreading. The powder spreading scraper 25 can move left and right. When the powder spreading box 26 is filled, the right upper end face of the powder spreading scraper 25 is just flush with the lower end face of the powder spreading box 26, and a powder feeding channel is blocked below the powder spreading box 26, which is called as a standby state at this time. After the filling is finished, the powder spreading scraper 25 moves leftwards, the powder feeding channel is opened, the powder falls, the powder spreading scraper 25 moves rightwards after the powder is stacked, the powder of the powder spreading box 26 is blocked while the powder is rolled, the powder spreading scraper 25 moves leftwards after the powder spreading is finished once to the left side of the powder spreading box 26, the powder continues to fall, and meanwhile, the electron beam starts to print. Because the hopper of the powder spreading box 26 is fixed, the powder spreading box 26 is designed to be trapezoidal in order to save space and not influence the work of the electron beams. When the first layer printing is completed, the substrate 27 is lowered a certain distance and the printing process is repeated.
To solve the problem that the powder spreading box 26 cannot guarantee uniform spreading of powder when the powder of each mixing ratio is to be printed, it is decided to cancel the last powder spreading of each mixing ratio. After the powder spreading is completed once, when the powder in the powder spreading box 26 is not enough to cause that a gap exists between the powder spreading scraper 25 and the substrate 27 and is lower than a certain height, the powder spreading scraper 25 cannot be guaranteed to be spread uniformly, the powder spreading scraper 25 returns to a standby state, after the printing is completed, the powder spreading scraper 25 moves leftwards until the powder can fall down, and then the powder spreading scraper 25 moves rightwards to continue to spread the powder.
The height of a gap between the powder spreading scraper 25 and the base plate 27 is as follows:
the above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (9)
1. Electron beam 3D prints two powder feeding mechanism based on preparation of gradient functional material, including powder feeding mechanism (1), mixing stirring mechanism (2), vacuum transition room (3), shop's powder mechanism (4) and print table (5), its characterized in that: the top of mixing and stirring mechanism (2) has send powder mechanism (1), the below of mixing and stirring mechanism (2) has vacuum transition room (3), the below of vacuum transition room (3) has spread powder mechanism (4), the below of spreading powder mechanism (4) has print workstation (5), print workstation (5) sliding connection in spread powder mechanism (4), mix stirring mechanism (2), vacuum transition room (3) and spread between powder mechanism (4) sealing connection.
2. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation according to claim 1, characterized in that: mix the inside top of rabbling mechanism (2) and have first planetary screw (14) and second planetary screw (15) of surely inclining the setting, first planetary screw (14) and second planetary screw (15) dock in the feed inlet of powder feeding mechanism (1), the inside below of mixing rabbling mechanism (2) has mixes quick-witted valve body (16), mix quick-witted valve body (16) communicate in vacuum transition room (3), mix quick-witted valve body (16) and have and mix quick-witted valve body case (9), mix quick-witted valve body case (9) intercommunication or separate and mix rabbling mechanism (2) and vacuum transition room (3).
3. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation as claimed in claim 2, wherein: mix the inside top intermediate position of rabbling mechanism (2) and have puddler (10), puddler (10) have connected with motor (6) that have in mixing rabbling mechanism (2) top, motor (6) are located send whitewashed cover (7), send whitewashed cover (7) to seal in the top of advancing powder cabin (8), send whitewashed cover (7) to have send the feed inlet of whitewashed mechanism (1).
4. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation as claimed in claim 2, wherein: powder feeding mechanism (1) has hopper (11), cylinder (12), screw rod (13) and buncher, screw rod (13) are located the inside of cylinder (12) and the two screw-thread fit connection, buncher connects in screw rod (13), cylinder (12) with the butt joint of the feed inlet of powder feeding mechanism (1).
5. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation according to claim 1, characterized in that: the vacuum transition chamber (3) is internally provided with a valve core (18), the valve core (18), a transition chamber valve cover (24) and a transition chamber valve body (23) are sealed through a sealing ring (19), the valve core (18) is connected with a valve rod (16), the valve core (18) separates the transition chamber valve cover (24) and the transition chamber valve body (23), the vacuum transition chamber (3) is provided with an inlet (22) and an outlet (17), and the inlet (22) and the outlet (17) are respectively in sealing connection with the mixing and stirring mechanism (2) and the powder spreading mechanism (4).
6. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation as claimed in claim 5, wherein: a connecting screw rod (21) penetrates between the transition chamber valve cover (24) and the transition chamber valve body (23), and the connecting screw rod (21) locks the transition chamber valve cover (24) and the transition chamber valve body (23) in a threaded mode through a nut (20).
7. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation according to claim 1, characterized in that: spread powder mechanism (4) and have shop's powder scraper (25), shop's powder box (26) and base plate (27), shop's powder scraper (25) and the laminating of fixed shop's powder box (26), shop's powder scraper (25) with slide rail sliding connection on print table (5), base plate (27) are laid in the top of print table (5).
8. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation as claimed in claim 7, wherein: a gap is arranged between the powder spreading scraper (25) and the base plate (27).
9. The dual powder feeding mechanism for electron beam 3D printing based on gradient functional material preparation as claimed in claim 8, wherein: the powder feeding mechanism is characterized in that a discharge hole is formed below the powder feeding mechanism (1) and communicated with an inlet (22) of the vacuum transition chamber (3) through a pipeline, an outlet (17) is formed below the vacuum transition chamber (3), and the outlet (17) is communicated with the powder spreading mechanism (4) through a pipeline.
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