Adhesive jet additive manufacturing equipment based on selective powder laying mode

Abstract

The present invention discloses an adhesive jetting additive manufacturing device based on a selective powder laydown mode. [Solution] The apparatus includes various devices such as a case, an adhesive jetting device, a powder laying device, and a lifting platform, wherein the adhesive jetting device includes a plurality of adhesive storage chambers, corresponding adhesive nozzles, and a near-infrared lamp, and the powder laying device includes a supply port, a powder laying roller disposed below the supply port, blades disposed on both sides of the powder laying roller, a powder adsorption device disposed inside the powder laying roller, and a powder discharge device. The adhesive jetting additive manufacturing apparatus with selective powder laying of the present invention can accurately lay two different powder materials in the same layer and adhere two or more powder materials.

Description

[Technical Field]

[0001] The present invention belongs to the field of additive manufacturing technology and relates to an adhesive jetting additive manufacturing device based on a selective powder laying mode. [Background technology]

[0002] Currently, adhesive jet additive manufacturing (ADM) is an additive manufacturing technology that uses adhesives and powdered materials to produce three-dimensional objects. The advantages of this technology include its ability to produce large-sized objects, compatibility with a wide range of materials, high material utilization, and high forming efficiency. It is not suitable for rapid molding design, the production of complex parts, and product customization. When used in metal printing, it can avoid technical issues such as low laser absorption of powders during laser printing of metal materials, which prevents melting, or stress warping during high-temperature cooling. However, its drawback is that conventional ADM is often limited to single-layer printing of a single material, meaning that some printed parts that require spatially heterogeneous material distribution cannot be completed. Summary of the Invention [Problem to be solved by the invention]

[0003] In response to the above-mentioned problems, the object of the present invention is to propose an adhesive jet additive manufacturing device based on a selective powder laying mode to overcome the inability of conventional adhesive jet additive manufacturing to print parts made of spatially heterogeneous materials. [Means for solving the problem]

[0004] The technical solution of the present invention is as follows: An adhesive jetting additive manufacturing device based on a selective powder laying mode according to the present invention, comprising a case, and a powder inlet is provided above the case; An adhesive spraying device is mounted inside the case, and the adhesive spraying device includes a plurality of adhesive storage chambers, each of which has a guide rod connected to its lower end, and each of which has an adhesive nozzle attached to its lower end.

[0005] Furthermore, the adhesive injection device is fixed and moved by four guide rails connected to the inner wall of the case, the four guide rails including two guide rails at the top and two guide rails on both sides; The two upper guide rails are clean belt-type motorized sliders that control the movement of the adhesive sprayer. The two guide rails on both sides are ball slide rails that secure the adhesive jetting device.

[0006] Furthermore, there are three rows of adhesive nozzles, and a small heating coil is attached above each adhesive nozzle.

[0007] Furthermore, a plurality of near-infrared lamps are further attached behind the adhesive nozzle, and the near-infrared lamps are composed of two rows of near-infrared lamp beads.

[0008] Furthermore, the powder inlet includes a powder feed hopper a and a powder feed hopper b; The upper opening of the powder supply hopper a is a rectangle that contracts downward, The powder supply hopper b has the same shape as the powder supply hopper a.

[0009] Furthermore, a powder laying tank is attached inside the case below powder supply hopper a and powder supply hopper b, and two guide rails are attached below the powder laying tank to fix and move the powder laying tank, and the guide rails are clean belt-type electric sliders.

[0010] Furthermore, the powder laying tank includes a powder laying device a and a powder laying device b, and two supply ports corresponding to the powder laying device a and the powder laying device b are opened at the upper interior positions of the powder laying device a and the powder laying device b, and discharge ports are opened at opposite ends of the supply ports; A powder spreading roller is attached near each of the two discharge ports, and a blade is attached to each side of the powder spreading roller. A powder adsorption device and a powder discharge device are attached symmetrically above and below inside the powder spreading roller.

[0011] Furthermore, the powder laying roller has holes distributed over its entire surface, The pore diameter is <1 μm.

[0012] Furthermore, a nozzle head having the same diameter as the diameter of the hole formed on the surface of the powder spreading roller is disposed on the lower surface of the powder discharging device; The powder laying roller and the valves in the nozzle head of the powder discharger are wirelessly connected to a monitoring system.

[0013] Furthermore, a printing platform is attached to the center of the lower interior of the case. This printing platform is a lifting platform that can be raised and lowered freely. The lifting platform is driven by a single filament rod to move up and down, and four guide rods are attached around its four sides to ensure the platform's stability when raised and lowered. [Effects of the Invention]

[0014] Beneficial effects of the present invention: The selective powder laying adhesive jetting additive manufacturing device of the present invention can accurately lay two different powder materials in the same layer and adhere two or more powder materials, which is of great help to the machinery industry and material industry. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of the overall structure of the present invention; [Figure 2]FIG. 2 is a half cross-sectional view of the front view of FIG. [Figure 3] FIG. 2 is a half cross-sectional view of the left side view of FIG. 1. [Figure 4] 1 is a schematic diagram of the internal structure of a powder laying device according to the present invention. [Figure 5] 1 is a schematic diagram of the internal structure of an adhesive injection device according to the present invention. [Figure 6] 1 is a schematic diagram of a clean belt-type motorized slider according to the present invention. [Figure 7] FIG. 1 is a schematic diagram of powder feeding during operation of the present invention. [Figure 8] 1 is a schematic diagram of powder laying during operation of the present invention. FIG. [Figure 9] 1 is a schematic diagram of adhesive jetting of the present invention in operation. DETAILED DESCRIPTION OF THE INVENTION

[0016] The specific technical solutions of the present invention will be described in more detail below using specific examples.

[0017] As shown in FIGS. 1 to 6, the adhesive jet additive manufacturing apparatus based on the selective powder laying mode according to the present invention mainly includes a case 1, a powder inlet 2 is installed on the upper side (top right side) of the case 1, and powder enters the apparatus through the powder inlet 2 via a material supply device (not shown). The powder inlet 2 includes a powder supply hopper a6 and a powder supply hopper b7. The adhesive injection device 3 includes a plurality of adhesive reservoir chambers 15, adhesive nozzles 16 corresponding to the respective adhesive reservoir chambers 15, and near-infrared lamps 17 provided behind the adhesive nozzles 16. Corresponding powder supply hoppers a6 and b7 are attached to powder laying tanks 4, which are divided into powder laying devices a8 and b9. The powder laying devices a8 and b9 have supply ports 10 at their top ends and discharge ports at the opposite ends of the supply ports 10. A powder laying roller 13 is disposed below the discharge ports, and blades 11 are disposed on both sides of the powder laying roller 13. A powder adsorption device 12 and a powder discharge device 14 are disposed inside the powder laying roller 13.

[0018] The upper opening of the powder supply hopper a6 is a rectangle that contracts downward to become smaller.

[0019] The powder supply hopper b7 has the same shape as the powder supply hopper a6.

[0020] The width of the adhesive spraying device 3 is smaller than the distance between the powder laying tank 4 and the case 1 so that the powder laying tank 4 can move freely. A plurality of adhesive reservoir chambers 15 are arranged above the adhesive spraying device 3, and the adhesive reservoir chambers 15 are arranged in parallel above the adhesive spraying device 3, and a guide rod is connected to the bottom of each adhesive reservoir chamber 15.

[0021] Adhesive nozzles 16 are connected to the bottom of the adhesive storage chamber 15 via a guide rod, and adhesive nozzles 16 are connected to the guide rod. There are three rows of adhesive nozzles 16, and above each adhesive nozzle 16 there is a small heating coil for spraying adhesive.

[0022] Behind the adhesive nozzle 16, a near-infrared lamp 17 is provided, which is made up of two rows of near-infrared lamp beads, for rapidly curing the adhesive sprayed portion.

[0023] The adhesive sprayer 3 (middle position) is stably fixed to move back and forth by four guide rails. The height of the guide rails is higher than that of the powder-laying tank 4. The upper two are clean belt-type electric sliders that control the movement of the sprayer 3. Their closed design effectively blocks dust and ensures stable operation of the machine. The two on both sides are ball slide rails that ensure stable operation.

[0024] The powder laying tank 4 is located below the powder supply hoppers b7 and a6, and is connected to and moved by two guide rails. The tank is stably fixed to the guide rails via connecting members so that it can move left and right.

[0025] The guide rail is a clean belt-type motorized slider.

[0026] The powder laying tank 4 is located below the powder supply hopper, and the height of the powder laying tank 4 is lower than the height of the guide rail of the fixed adhesive injection device 3. The upper interior of the powder depositing tank 4 has two supply ports 10 corresponding to the powder supply hoppers b7 and a6, and the supply ports 10 are designed to narrow downwards so that the powder can be accurately fed into the corresponding supply port 10.

[0027] A powder-laying roller 13 is placed at the discharge port below the supply port 10, and fine holes are distributed over the entire surface of the powder-laying roller 13, with a diameter of less than 1 μm (the maximum diameter of the hole is smaller than the minimum diameter of the powder), thereby effectively blocking the powder from entering the interior of the powder-laying roller 13.

[0028] The outlet is arc-shaped.

[0029] Two blades 11 are symmetrically arranged on both sides of the powder laying roller 13, and the blades 11 are radially movable to adjust the thickness of the powder laid in each layer, so that the fallen powder is laid evenly and flatly.

[0030] A powder adsorption device 12 is provided above the inside of the powder spreading roller 13. By drawing air into the powder adsorption device 12, the powder is uniformly and firmly adsorbed onto the surface of the powder spreading roller 13. The powder adsorption device 12 is also used to apply an electric charge to the powder spreading roller 13, so that the fallen powder is further adsorbed onto the powder spreading roller 13.

[0031] A powder discharge device 14 is provided below and inside the powder laying roller 13 to emit an electric charge opposite to the charge applied by the powder adsorption device 12 and lay powder at a corresponding position on the powder laying roller 13 onto the lower printing platform.

[0032] The printing platform is attached to a central position inside the device and consists of a lifting platform 5 that can be raised and lowered freely. The lifting platform 5 is driven by a single filament rod to move up and down, and four guide rods are attached around its four sides to ensure the platform's stability when raised and lowered.

[0033] The powder adsorption device 12 adsorbs the powder that has just come out of the supply port 10 onto the powder spreading roller 13 by emitting a certain Coulomb force.

[0034] The powder spreading roller 13 has a certain negative pressure inside, and under the action of the negative pressure, the powder is further adsorbed onto the powder spreading roller 13. Since the diameter of the holes on the surface of the powder spreading roller 13 is smaller than the diameter of the powder particles, the powder does not penetrate into the inside of the powder spreading roller 13.

[0035] A fine nozzle head with the same diameter as the hole on the surface of the powder-laying roller 13 is arranged on the underside of the powder-laying device 14. When the area on the powder-laying roller 13 where powder needs to be laid rotates to the relative position, the nozzle head at the corresponding position on the powder-laying device 14 starts to operate and emits a constant airflow with constant pressure, thereby applying enough force to the powder below to resist the negative pressure suction force and laying it on the lifting platform 5.

[0036] The rotational position of the powder laying roller 13 and the opening position of the nozzle head valve of the powder discharge device 14 are controlled collectively by the system.

[0037] The working principle or working method of the present invention is as follows.

[0038] As shown in Figures 7 to 9, powder A enters the right-side supply port 10 of the powder laying tank 4 from the right-side powder supply hopper a6, and powder B enters the left-side supply port 10 of the powder laying tank 4 from the left-side powder supply hopper b7. The powder falls from the supply port 10. The powder adsorbent 12 applies Coulomb force to the powder, which, combined with the negative pressure inside the powder laying roller 13, causes the powder to be uniformly adsorbed onto the outer surface of the powder laying roller 13. The powder laying tank 4 is translated to the left, and the powder laying roller 13 rotates counterclockwise. The blade 11 flattens the powder. When the powder laying roller 13 reaches the corresponding position, the powder discharger 14 begins to operate. The nozzle head at the corresponding position of the powder ejector 14 begins to operate, spraying a constant airflow at a constant pressure, providing the powder below with enough force to resist the negative pressure suction and deposit it onto the printing stage. As the adhesive jetting device 3 moves forward to its corresponding position, the heating coil operates, and the corresponding adhesive nozzle 16 dispenses adhesive. The adhesive and powder are then further cured by the irradiation of the rear near-infrared lamp 17. The lifting platform 5 then moves to the next layer. The above process is repeated until printing is complete. The model is then removed and placed in a furnace for sintering, and a series of post-processing steps complete the printing process. [Explanation of symbols]

[0039] In the figure 1. Case 2. Powder inlet 3. Adhesive injection equipment 4. Powder laying tank 5. Lifting platform 6. Powder supply hopper a 7. Powder supply hopper b 8, powder laying device a 9, powder laying device b 10. Supply port 11. Blade 12, powder adsorption device 13. Powder laying roller 14, powder discharge device 15. Adhesive storage chamber 16. Adhesive nozzle 17. Near-infrared lamp

Claims

1. 1. An adhesive jetting additive manufacturing apparatus based on a selective powder lay-down mode, comprising: The apparatus includes a case (1), and a powder inlet (2) is provided above the case (1); An adhesive spraying device (3) is attached inside the case (1), and the adhesive spraying device (3) includes a plurality of adhesive storage chambers (15), each of which has a guide rod connected to its lower end, and each of which has an adhesive nozzle (16) attached to its lower end; The adhesive injection device (3) is fixed and moved by four guide rails connected to the inner wall of the case (1), and the four guide rails include two guide rails at the top and two guide rails on both sides; The two upper guide rails are clean belt-type motorized sliders that control the movement of the adhesive spray device (3); The adhesive jet additive manufacturing device based on selective powder laying mode, characterized in that the two guide rails on both sides are ball slide rails, and fix the adhesive jet device (3).

2. 2. The adhesive jet additive manufacturing device based on a selective powder laying mode according to claim 1, wherein the adhesive nozzles (16) are arranged in three rows, and a small heating coil is attached above each adhesive nozzle (16).

3. 3. The adhesive jet additive manufacturing apparatus based on selective powder laying mode according to claim 2, characterized in that a plurality of near-infrared lamps (17) are further mounted behind the adhesive nozzle (16), and the near-infrared lamps (17) consist of two rows of near-infrared lamp beads.

4. The powder inlet (2) includes a powder feed hopper a (6) and a powder feed hopper b (7), The upper opening of the powder supply hopper a (6) is a square that contracts downwards, 2. The adhesive jet additive manufacturing device based on selective powder laying mode according to claim 1, characterized in that the powder feed hopper b (7) has the same shape as the powder feed hopper a (6).

5. 5. The adhesive jet additive manufacturing apparatus based on the selective powder laying mode according to claim 4, characterized in that a powder laying tank (4) is installed inside the case (1) below the powder feed hopper a (6) and the powder feed hopper b (7), and two guide rails are installed below the powder laying tank (4) for fixing and moving the powder laying tank (4), the guide rails being clean belt-type motorized sliders.

6. The powder laying tank (4) includes a powder laying device a (8) and a powder laying device b (9), and two supply ports (10) are opened at the upper interiors of the powder laying device a (8) and the powder laying device b (9), and discharge ports are opened at opposite ends of the supply ports (10); 6. The adhesive jet additive manufacturing device based on the selective powder laying mode according to claim 5, characterized in that a powder laying roller (13) is attached near each of the two discharge ports, a blade (11) is attached to each side of the powder laying roller (13), and a powder adsorption device (12) and a powder discharge device (14) are attached symmetrically above and below inside the powder laying roller (13).

7. The powder laying roller (13) has holes distributed over its entire surface, 7. The selective powder laying mode based adhesive jet additive manufacturing device of claim 6, wherein the hole diameter is <1 μm.

8. A nozzle head having the same diameter as the diameter of the holes drilled in the surface of the powder laying roller (13) is arranged on the underside of the powder discharge device (14); 8. The adhesive jetting additive manufacturing device based on selective powder laying mode according to claim 7, characterized in that the valves of the powder laying roller (13) and the nozzle head of the powder discharger (14) are wirelessly connected to a monitoring system.

9. A printing platform is further attached to the central position of the lower interior of the case (1), 6. The adhesive jetting additive manufacturing device based on the selective powder laying mode according to claim 5, wherein the printing platform is a lifting platform (5) that can be raised and lowered freely, and the lifting platform (5) is driven by a single filament rod to move up and down, and four guide rods are attached around the platform to ensure the stability of the platform when raised and lowered.

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