A dual-cylinder powder feeding gradient particle reinforced aluminum matrix composite additive manufacturing device

Abstract

This utility model discloses a dual-cylinder powder feeding gradient particle-reinforced aluminum matrix composite additive manufacturing device. The powder dynamic mixer includes a shell with two powder cylinder support frames. A first powder feeding cylinder and a second powder feeding cylinder are respectively mounted on the two powder cylinder support frames. The first powder feeding hose and the second powder feeding hose extend into the shell and are respectively connected to flow regulating valves. A "Y"-shaped dynamic mixing cylinder is set inside the shell. Powder inlet channels are connected to the left and right sides of the top of the "Y"-shaped dynamic mixing cylinder. The powder inlet channels are tangent to the top sides of the "Y"-shaped dynamic mixing cylinder and are connected to the flow regulating valves. A main output pipe for powder feeding is connected to the lower end of the "Y"-shaped dynamic mixing cylinder. It can realize independent control of the powder feeding parameters of the two paths, optimize the melt pool reaction, and improve the efficiency of additive printing. The "Y"-shaped dynamic mixing cylinder improves the uniformity of the composition after the powder flows are mixed through its specific structural design, effectively avoiding adverse phenomena such as powder accumulation.

Description

Technical Field

[0001] This utility model relates to the field of additive manufacturing equipment technology, and in particular to an additive manufacturing device for gradient particle reinforced aluminum matrix composite materials with dual-cylinder powder feeding. Background Technology

[0002] Existing additive manufacturing equipment generally uses single-cylinder powder feeding, resulting in a relatively simple powder feeding method. When it is necessary to adjust the powder composition (such as the ratio of matrix powder to reinforcing phase), the single-cylinder powder feeding device must first empty the powder hopper and powder feeding pipe of any residual powder before replacing it with new powder of the new composition, or it must be equipped with two or more independent powder feeding devices with different powder compositions before subsequent operations can be carried out. Especially when it involves the mixing of reinforcing phase particles (such as zirconium boride particles), temporary mixing is very likely to lead to uneven mixing, resulting in uneven dispersion of the reinforcing phase. In addition, once the powder mixing is completed in a traditional dual-cylinder powder feeding premixing device, the content of the reinforcing phase is fixed, making it difficult to achieve subsequent dynamic adjustment.

[0003] The single-tube powder feeding mode currently presents the following problems: 1. Limited processing efficiency: The powder feeding rate of a single-tube additive manufacturing system has an inherent upper limit, restricting subsequent processing speed. 2. Complex and error-prone process for switching mixed powder components: When changing to mixed powders with different components, the residual powder in the current powder hopper and powder feeding pipe must be thoroughly emptied, making the cleaning and replacement process cumbersome. Furthermore, incomplete cleaning of residual powder will cause the actual composition of the conveyed mixed powder to deviate from expectations, affecting not only the consistency of the microstructure and mechanical properties of the molded material but also wasting powder raw materials. 3. Increased space costs: Relying on multiple powder feeding devices to meet the different component requirements of mixed powders occupies a large area, significantly increasing equipment purchase costs and space requirements. 4. Difficulty in dynamically adjusting the reinforcing phase ratio: The content of the reinforcing phase in the premixed powder is quantified. When switching to mixed powders with different reinforcing phase contents, the premixing process must be repeated, making the process cumbersome, affecting production efficiency and process controllability, and making it difficult to avoid errors. Therefore, providing a premixed dual-cylinder powder feeding gradient particle-reinforced aluminum matrix composite additive manufacturing device for the additive manufacturing of particle-reinforced aluminum matrix composites is a technical requirement that urgently needs to be addressed. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems existing in the prior art and to provide a gradient particle reinforced aluminum matrix composite additive manufacturing device with dual-cylinder powder feeding.

[0005] To achieve the above objectives, the technical solution provided by this utility model is: a gradient particle-reinforced aluminum matrix composite additive manufacturing device with dual-cylinder powder feeding, the device including a powder dynamic mixer, the powder dynamic mixer including a shell, two powder cylinder support frames are provided on the shell, a first powder feeding cylinder and a second powder feeding cylinder are respectively provided on the two powder cylinder support frames, the bottom of the first powder feeding cylinder and the second powder feeding cylinder are provided with an inverted conical shape, and the bottom of the first powder feeding cylinder and the second powder feeding cylinder are provided with a discharge port, the discharge port is provided with an inverted conical rectifier, the rectifier is respectively connected to a first powder feeding hose and a second powder feeding hose, a motor is respectively provided on the first powder feeding cylinder and the second powder feeding cylinder, the output end of the motor is provided with a rotating shaft, the rotating shaft extends into the first powder feeding cylinder and the second powder feeding cylinder and is provided with a stirring mechanism, and the bottom of the rotating shaft is provided at the discharge port and is provided with a spiral feeding mechanism; The housing contains a "Y"-shaped dynamic mixing cylinder and two flow regulating valves. The "Y"-shaped dynamic mixing cylinder is located between the two flow regulating valves. The second powder feeding hose and the first powder feeding hose extend into the housing and are connected to the flow regulating valves on the left and right sides, respectively. The "Y"-shaped dynamic mixing cylinder is funnel-shaped, and powder inlet channels are connected to the left and right sides of the top of the "Y"-shaped dynamic mixing cylinder. The powder inlet channels are tangent to the top of the "Y"-shaped dynamic mixing cylinder and are connected to the flow regulating valves. A powder outlet is provided at the lower end of the "Y"-shaped dynamic mixing cylinder and is connected to the main output pipe.

[0006] Preferably, the bottom of the two flow regulating valves is provided with gear valve strips for adjusting the opening degree. The first adjusting rod and the second adjusting rod are rotatably arranged on the left and right sides of the outer shell, respectively. The ends of the first adjusting rod and the second adjusting rod are provided with bevel gears. The bevel gear at the end of the first adjusting rod meshes with the gear valve strip on the right side, and the bevel gear at the end of the second adjusting rod meshes with the gear valve strip on the left side.

[0007] Preferably, the minimum rotational speed of the motor-driven shaft is 60 r / min.

[0008] Preferably, the screw feeding mechanism includes an upper screen plate, a lower plate, and a screw blade mounted on a rotating shaft. The upper screen plate is located below the screw blade, and the lower plate is located below the upper screen plate. The upper screen plate has four through holes that are symmetrically centered, and the lower plate has one lower hole.

[0009] Preferably, a powder feeding nozzle is fixedly installed at the bottom of the feeding plate. The powder feeding nozzle is located outside the feeding hole and inside the rectifier. The bottom of the powder feeding nozzle is inverted conical. An argon gas outlet is provided on the inverted conical wall at the bottom of the powder feeding nozzle. An argon gas vent is provided at the top of the powder feeding nozzle. A one-way valve is provided on the argon gas outlet and the argon gas vent. The argon gas vent passes through the rectifier and connects to an external argon gas cylinder. The negative pressure of the argon gas introduced through the argon gas vent is 0.08 MPa.

[0010] Preferably, the powder inlet channels on both sides of the "Y"-shaped dynamic mixing cylinder are at a 30° angle to the horizontal line. -45° angle.

[0011] Preferably, the device further includes a fiber laser and a laser cladding head; the fiber laser is connected to the laser input interface at the top of the laser cladding head via a flexible optical fiber, a main output tube is provided at the bottom of the powder dynamic mixer, and a pneumatic connector is provided on the side of the laser cladding head, which is connected to the main output tube for powder feeding.

[0012] The beneficial effects of this utility model are: 1. This invention allows for independent adjustment of the rotational speed of the shafts inside the first and second powder feeding cylinders via motors, thereby controlling the powder output of each cylinder and dynamically controlling the content of the reinforcing phase in the mixed powder in real time. Furthermore, by independently controlling the dual-path powder feeding, the powder flow focusing state is adjusted in real time, improving the timing and spatial distribution of the mixed powder entering the "Y"-shaped dynamic mixing cylinder and optimizing the subsequent reaction within the cylinder. Simultaneously, the uniformly distributed reinforcing phase reduces local stress concentration and creates more pinning effects at the grain boundaries of the matrix phase, thus inhibiting grain boundary migration and effectively preventing reinforcing phase detachment due to high temperatures during subsequent printing, ensuring the stability of the final molded part. 2. By setting up a flow regulating valve and a first regulating rod and a second regulating rod, this utility model can flexibly adjust the content of the reinforcing phase in the mixed powder, forming an in-situ additive manufacturing of mixed powder reinforcing phase gradient concentration materials in a spatial dimension, improving the design freedom and performance diversity of powder molding components, and promoting the customized design of powder molding material structures.

[0013] 3. This utility model is equipped with a "Y"-shaped dynamic mixing cylinder, which extends the effective mixing path and mixing time during powder mixing. From the top view, the powder gas-solid two-phase flow enters along the tangential direction on both sides of the top circle of the "Y"-shaped dynamic mixing cylinder, which can form a spiral powder airflow. At the same time, the specific angle design of its "Y"-shaped structure can increase the contact area of ​​the two powder airflows, thereby improving the mixing efficiency and further ensuring the mixing uniformity of the dual-path powder gas-solid two-phase flow, effectively suppressing adverse phenomena such as powder accumulation.

[0014] 4. Argon is used as both a protective gas and a powder delivery gas, eliminating the need for additional gases. Furthermore, the utilization rate of both the powder and argon is close to 100%, effectively avoiding waste of powder or gas.

[0015] 5. This utility model integrates dual-path powder feeding, dynamic mixing and powder recovery functions, reducing the site area occupied, reducing site capital and equipment purchase costs, and lowering production costs. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0017] Figure 1 This is a schematic diagram of the additive printing structure in this utility model; Figure 2 This is a schematic diagram of the structure of the powder dynamic mixer of this utility model; Figure 3 This is a cross-sectional view of the powder dynamic mixer of this utility model; Figure 4 This is a schematic diagram of the bottom discharge port structure of the first powder feeding cylinder and the second powder feeding cylinder of this utility model; Figure 5 This is a top view of the upper sieve plate of this utility model; Figure 6 This is a top view of the cutting plate of this utility model. Figure 7 This is a schematic diagram of the powder feeding nozzle structure of this utility model; Figure 8 This is a cross-sectional view of the flow regulating valve of this utility model; Figure 9 This is a schematic diagram of the "Y"-shaped dynamic mixing cylinder and powder inlet channel structure of this utility model; Figure 10 (a) and (b) are microstructure diagrams of the aluminum powder and zirconium boride mixed powder after single-path powder feeding and powder feeding using this utility model, respectively.

[0018] Attached image captions: 1-Fiber laser, 2-Laser cladding head, 3-Powder dynamic mixer, 4-Rotating shaft, 5-First powder feeding cylinder, 6-Powder cylinder support frame, 7-First powder feeding hose, 8-Flow regulating valve, 9-First regulating rod, 10-Second regulating rod, 11-“Y”-shaped dynamic mixing cylinder, 12-Second powder feeding hose, 13-Argon gas inlet, 14-Second powder feeding cylinder, 15-Upper sieve plate, 16-Discharge plate, 17-Powder feeding nozzle, 18-Spiral blade, 19-Fairing cover. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1-10 In a preferred embodiment of this utility model, a gradient particle-reinforced aluminum matrix composite additive manufacturing device with dual-cylinder powder feeding is disclosed. The device includes a fiber laser 1, a laser cladding head 2, and a powder dynamic mixer 3. The fiber laser 1 is connected to the laser input interface at the top of the laser cladding head 2 via a flexible optical fiber. The powder dynamic mixer 3 has a main output tube at its bottom. A pneumatic connector is provided on the side of the laser cladding head 2, and the pneumatic connector is connected to the main output tube for powder feeding. After the powder is mixed using the powder dynamic mixer 3, the powder is synchronously transported to the laser focusing point using a carrier gas (argon). At the same time, the switch of the fiber laser 1 is turned on, causing the laser cladding head 2 to move and start 3D printing.

[0024] The powder dynamic mixer includes a housing, on which two powder cylinder support frames 6 are provided. A first powder feeding cylinder 5 and a second powder feeding cylinder 14 are respectively provided on the two powder cylinder support frames 6. The bottom of the first powder feeding cylinder 5 and the second powder feeding cylinder 14 are provided with inverted conical shapes and discharge ports. An inverted conical shroud 19 is provided on the discharge port. A first powder feeding hose 7 and a second powder feeding hose 12 are respectively connected to the shroud 19. A motor is provided on the first powder feeding cylinder 5 and the second powder feeding cylinder 14. A rotating shaft 4 is provided at the output end of the motor. A stirring mechanism is provided inside the first powder feeding cylinder 5 and the second powder feeding cylinder 14. The stirring mechanism is preferably a ring-shaped stirring rod. A spiral feeding mechanism is provided at the bottom of the rotating shaft 4 at the discharge port. Furthermore, the screw feeding mechanism includes an upper screen plate 15, a lower plate 16, and a screw blade 18 disposed on the rotating shaft 4. The upper screen plate 15 is located below the screw blade 18, and the lower plate 16 is located below the upper screen plate 15. The upper screen plate 15 is provided with four through holes, which are symmetrically centered. The lower plate 16 is provided with one lowering hole.

[0025] Specifically, the rotating shaft 4 inside the first powder feeding cylinder 5 and the second powder feeding cylinder 14 is driven by a motor, and the rotation speed of the rotating shaft 4 is adjustable through the motor. That is, when the rotating shaft 4 rotates, the powder particles move radially to the walls of the first powder feeding cylinder 5 and the second powder feeding cylinder 14 under the action of centrifugal force. Due to gravity, the powder particles will slide vertically downward. Therefore, the rotating shaft 4 will provide a certain amount of mixed powder for each rotation.

[0026] The housing contains a Y-shaped dynamic mixing cylinder 11 and two flow regulating valves 8. The top of the Y-shaped dynamic mixing cylinder 11 is fixedly connected to the housing via a rod, and the flow regulating valves 8 are fixedly connected to the side wall of the housing via rods. Inside the housing, the Y-shaped dynamic mixing cylinder 11 is located between the two flow regulating valves 8. The second powder feeding hose 12 and the first powder feeding hose 7 extend into the housing and connect to the flow regulating valves 8 on the left and right sides respectively (preferably, the housing has holes for the second powder feeding hose 12 and the first powder feeding hose 7 to pass through). The Y-shaped dynamic mixing cylinder 11 is funnel-shaped, and powder inlet channels are connected to the top two sides of the top of the Y-shaped dynamic mixing cylinder 11. The powder inlet channels are tangent to the top two sides of the Y-shaped dynamic mixing cylinder 11. The powder inlet channels are connected to and pass through the flow regulating valve 8, forming a premixed double-cylinder powder feeding structure. The bottom end of the Y-shaped dynamic mixing cylinder 11 is provided with a powder outlet, which is connected to the main output pipe. During operation, the gas-solid two-phase flow of powder on both sides enters the mixing chamber along the tangent direction of the top circle when viewed from the top view. A spiral mixing gas-solid two-phase flow of powder can be formed inside the Y-shaped dynamic mixing cylinder 11.

[0027] In this embodiment, a powder feeding nozzle 17 is fixedly installed at the bottom of the feeding plate 16. The powder feeding nozzle 17 is located outside the feeding hole and inside the rectifier 19. The bottom of the powder feeding nozzle 17 is inverted conical. An argon gas outlet is provided on the inverted conical wall at the bottom of the powder feeding nozzle 17. An argon gas inlet 13 is opened at the top of the powder feeding nozzle 17. A one-way valve is provided on the argon gas outlet and the argon gas inlet 13. The argon gas inlet 13 passes through the rectifier 19 and connects to an external argon gas cylinder. The negative pressure of the argon gas introduced into the argon gas inlet 13 is 0.08MPa.

[0028] Specifically, both sides of the argon gas inlet 13 are filled with argon gas to form a gas-solid two-phase flow of powder; the first powder feeding cylinder 5 vertically feeds mixed powder with a certain reinforcing phase ratio into the flow regulating valve 8 on the right side through the first powder feeding hose 7, and the second powder feeding cylinder 14 vertically feeds mixed powder with a different reinforcing phase ratio into the flow regulating valve 8 on the left side through the second powder feeding hose 12.

[0029] In this embodiment, the bottom of the two flow regulating valves 8 is provided with gear valve strips for adjusting the opening degree. The first adjusting rod 9 and the second adjusting rod 10 are rotatably arranged on the left and right sides of the outer shell, respectively. The ends of the first adjusting rod 9 and the second adjusting rod 10 are provided with bevel gears. The bevel gear at the end of the first adjusting rod 9 meshes with the gear valve strip on the right side, and the bevel gear at the end of the second adjusting rod 10 meshes with the gear valve strip on the left side.

[0030] Specifically, the first regulating rod 9 and the second regulating rod 10 control the opening of the dual-flow regulating valve through electronic control, thereby changing the flow rate of the dual-path powder gas.

[0031] In this embodiment, the minimum rotational speed of the motor driving the rotating shaft 4 is 60 r / min.

[0032] In this embodiment, the powder inlet channels on both sides of the "Y"-shaped dynamic mixing cylinder 11 are at a 30° angle to the horizontal line. -45° angle.

[0033] When using this utility model, the following steps are included: 1) The reinforcing phase and the matrix phase are mixed in a predetermined ratio using a mechanical mixing method to obtain a mixed powder with different ratios of the two reinforcing phases.

[0034] 2) The two premixed powders with different reinforcing ratios are respectively loaded into the first powder feeding cylinder 5 and the second powder feeding cylinder 14; 3) Turn on the motor on the first powder feeding cylinder 5 and the second powder feeding cylinder 14 to drive the rotating shaft 4 to rotate. The rotating shaft 4 can give a certain amount of mixed powder for each rotation, so that the mixed powder in the first powder feeding cylinder 5 and the second powder feeding cylinder 14 enters the flow regulating valve 8 through the powder feeding nozzle 17 and the first powder feeding hose 7 and the second powder feeding hose 12 respectively. 4) Before entering the flow regulating valve 8, the valve of the argon cylinder is opened, allowing argon gas to enter the powder feeding nozzle 17 through the argon gas inlet 13, mixing the solid powder with the argon gas to form a gas-solid two-phase flow of powder. Then, it enters the flow regulating valve 8 through the first powder feeding hose 7 and the second powder feeding hose 12. From the top view, the gas-solid two-phase flow of powder on both sides enters the powder inlet channel of the "Y"-shaped dynamic mixing cylinder 11 along the tangent direction of the top surface of the "Y"-shaped dynamic mixing cylinder 11, forming a spiral mixed gas-solid two-phase flow of powder; at the same time, the argon gas also acts as a protective gas. 5) Feed the mixed powder from the “Y”-shaped dynamic mixing cylinder 11 into the laser cladding head 2, adjust the powder feeding parameters such as carrier gas flow rate and powder tray rotation speed, and the 3D printing parameters such as protective gas flow rate, laser power, and scanning speed, and use the mixed powder for 3D printing; it should be noted that the above parameter settings are conventional technical means in this field and belong to the prior art, therefore, they will not be described in detail. Example 1

[0035] The first powder feeding cylinder 5 and the second powder feeding cylinder 14 are equipped with inverted conical discharge ports at their bottoms. The powder inlet channels on both sides of the "Y"-shaped dynamic mixing cylinder 11 form a 40° angle with the horizontal line. The rotation speed of the rotating shaft 4 is at least 60 r / min and is adjusted in real time. The specific steps include the following: a. Zirconium boride (reinforcing phase) and aluminum powder (matrix phase) are mixed in a predetermined ratio using a mechanical mixing method to obtain two types of aluminum powder-zirconium boride mixed powders with different proportions of zirconium boride (reinforcing phase), namely 2% and 4% zirconium boride, respectively; b. Load the premixed aluminum powder and zirconium boride particles with a zirconium boride ratio of 2% into the first powder feeding cylinder 5, and load the premixed aluminum powder and zirconium boride particles with a zirconium boride ratio of 4% into the second powder feeding cylinder 14. c. The motors on the first powder feeding cylinder 5 and the second powder feeding cylinder 14 are turned on. The rotating shaft 4 can give out a certain amount of aluminum powder and zirconium boride mixed powder with each rotation, so that the aluminum powder and zirconium boride mixed powder in the first powder feeding cylinder 5 and the second powder feeding cylinder 14 enter the flow regulating valve 8 vertically through the first powder feeding hose 7 and the second powder feeding hose 12 respectively. d. Before entering the flow regulating valve 8, open the valve of the argon cylinder to allow argon gas to enter the powder feeding nozzle 17 inside the rectifier 19 through the argon gas inlet 13. This mixes the aluminum powder and zirconium boride powder with the argon gas, forming a gas-solid two-phase flow of the powder. Subsequently, the powder enters the flow regulating valve 8, forming a uniform gas-solid two-phase flow of mixed powder on both sides. From the top view, the gas-solid two-phase flow of powder on both sides of the "Y"-shaped dynamic mixing cylinder 11 enters the powder inlet channel of the "Y"-shaped dynamic mixing cylinder 11 along the tangent direction of the top surface of the "Y"-shaped dynamic mixing cylinder 11, forming a spiral gas-solid two-phase flow of mixed powder. At the same time, the argon gas also acts as a protective gas. e. Rotate the first adjusting rod 9 and the second adjusting rod 10. When the openings of the flow regulating valves 8 on both sides are the same, the proportion of zirconium boride (reinforcing phase) in the final mixed powder is 3%. When the opening of the flow regulating valve 8 on the left side connected to the second powder feeding hose 12 is four times the opening of the flow regulating valve 8 on the right side connected to the first powder feeding hose 7, and the rotational speed of the shaft inside the second powder feeding cylinder 14 is four times that of the shaft inside the first powder feeding cylinder 5, the proportion of zirconium boride in the aluminum powder-zirconium boride mixed powder in the second powder feeding hose 12 is four times that in the aluminum powder-zirconium boride mixed powder in the first powder feeding hose 7, and the proportion of zirconium boride (reinforcing phase) in the final mixed powder is 3.6%. This forms a gradient concentration of reinforcing phase. f. Feed the mixed powder from the "Y"-shaped dynamic mixing cylinder 11 into the laser cladding head 2. Set the powder feeding parameters as follows: carrier gas flow rate s2=4L / min, powder tray rotation speed V=1.5g / min, and 3D printing parameters as follows: laser power of fiber laser 1 800W, scanning speed 300mm / s, protective gas flow rate s1=5L / min. Start 3D printing.

[0036] In contrast. Figure 10 (a) is a microstructure diagram of the mixed powder after single-path powder feeding. Its composition is a mixture of aluminum powder and zirconium boride with a zirconium boride ratio of 3%, in which the reinforcing phase showed a relatively serious agglomeration phenomenon. Figure 10 (b) is a microstructure diagram of the mixed powder after powder feeding using the present invention. The reinforcing phase in the mixed powder is more dispersed and uniform.

[0037] The results show that the present invention provides a method to control the powder output of each of the two powder feeding cylinders by independently changing the rotation speed of the rotating shaft 4 inside the first powder feeding cylinder 5 and the second powder feeding cylinder 14 through the motors on the first powder feeding cylinder 5 and the second powder feeding cylinder 14, thereby controlling the proportion of the reinforcing phase in the mixed powder in real time and dynamically.

[0038] This utility model integrates dual-path powder feeding, dynamic mixing, and powder recovery functions into a single unit, significantly reducing the area occupied, reducing site investment and equipment purchase costs, and lowering production costs.

[0039] This invention, through the setting of flow regulating valve 8 and first regulating rod 9 and second regulating rod 10, can flexibly adjust the proportion of reinforcing phase in mixed powder, forming in-situ additive manufacturing of mixed powder reinforcing phase gradient concentration materials in spatial dimension, improving the performance diversity and design freedom of powder molding components, and increasing the controllable dimension of powder molding material performance.

[0040] This invention provides a method for real-time control of powder flow focusing state by independently regulating the dual-path powder feeding amount, thereby optimizing the spatiotemporal distribution of the final mixed powder transported into the "Y"-shaped dynamic mixing cylinder 11, improving the reaction process in the "Y"-shaped dynamic mixing cylinder 11, significantly improving the distribution uniformity of the reinforcing phase in the composite material, and ensuring the structural stability of the final molded part.

[0041] The utilization rate of powder and argon gas used in this invention is almost 100%, avoiding waste of powder and gas.

[0042] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0043] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. An additive manufacturing device for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding, characterized in that: The device includes a powder dynamic mixer, which includes a housing. Two powder cylinder support frames are provided on the housing. A first powder feeding cylinder and a second powder feeding cylinder are respectively provided on the two powder cylinder support frames. The bottom of the first powder feeding cylinder and the second powder feeding cylinder are provided with inverted conical shapes and discharge ports. An inverted conical shroud is provided on the discharge port. A first powder feeding hose and a second powder feeding hose are respectively connected to the shroud. A motor is provided on the first powder feeding cylinder and the second powder feeding cylinder. A rotating shaft is provided at the output end of the motor. A stirring mechanism is provided in the first powder feeding cylinder and the second powder feeding cylinder. A screw feeding mechanism is provided at the bottom of the rotating shaft at the discharge port. The housing contains a "Y"-shaped dynamic mixing cylinder and two flow regulating valves. The "Y"-shaped dynamic mixing cylinder is located between the two flow regulating valves. The second powder feeding hose and the first powder feeding hose extend into the housing and are connected to the flow regulating valves on the left and right sides, respectively. The "Y"-shaped dynamic mixing cylinder is funnel-shaped, and powder inlet channels are connected to the left and right sides of the top of the "Y"-shaped dynamic mixing cylinder. The powder inlet channels are tangent to the top of the "Y"-shaped dynamic mixing cylinder and are connected to the flow regulating valves. A powder outlet is provided at the lower end of the "Y"-shaped dynamic mixing cylinder and is connected to the main output pipe.

2. The additive manufacturing device for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 1, characterized in that: The bottom of the two flow regulating valves is equipped with gear valve strips for adjusting the opening degree. The first regulating rod and the second regulating rod are rotatably arranged on the left and right sides of the outer shell, respectively. Both the first regulating rod and the second regulating rod are equipped with bevel gears at their ends. The bevel gear at the end of the first regulating rod meshes with the gear valve strip on the right side, and the bevel gear at the end of the second regulating rod meshes with the gear valve strip on the left side.

3. The additive manufacturing apparatus for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 1, characterized in that: The minimum rotational speed at which the motor drives the shaft is 60 r / min.

4. The additive manufacturing apparatus for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 1, characterized in that: The screw feeding mechanism includes an upper screen plate, a lower plate, and a screw blade mounted on a rotating shaft. The upper screen plate is located below the screw blade, and the lower plate is located below the upper screen plate. The upper screen plate has four through holes that are symmetrically centered, and the lower plate has one lower hole.

5. The additive manufacturing apparatus for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 4, characterized in that: A powder feeding nozzle is fixedly installed at the bottom of the feeding plate. The powder feeding nozzle is located outside the feeding hole and inside the rectifier. The bottom of the powder feeding nozzle is inverted cone shape. An argon gas outlet is provided on the inverted cone wall at the bottom of the powder feeding nozzle. An argon gas vent is provided at the top of the powder feeding nozzle. A one-way valve is provided on the argon gas outlet and the argon gas vent. The argon gas vent passes through the rectifier and connects to an external argon gas cylinder. The negative pressure of the argon gas introduced through the argon gas vent is 0.08MPa.

6. The additive manufacturing apparatus for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 1, characterized in that: The powder inlet channels on both sides of the "Y"-shaped dynamic mixing cylinder are at a 30° angle to the horizontal line. -45° angle.

7. The additive manufacturing apparatus for gradient particle-reinforced aluminum matrix composite materials with dual-cylinder powder feeding according to claim 1, characterized in that: The device also includes a fiber laser and a laser cladding head; the fiber laser is connected to the laser input interface at the top of the laser cladding head via a flexible optical fiber, the powder dynamic mixer is provided with a main output tube at the bottom, and the side of the laser cladding head is provided with a pneumatic connector, which is connected to the main output tube for powder feeding.

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