A powder feeding device for selective laser melting digital material forming

Abstract

The present invention discloses a powder feeding device for selective laser melting digital material forming, which comprises two independent powder feeding mechanisms; these two independent powder feeding mechanisms have the functions of multi-material weighing and metering and fixed-point conveying; they can accurately supply various powders of different materials in accordance with the required weight ratio, enabling the powder ratio within each powder spreading layer to be controllable; and they can accurately convey the specified material to a predetermined position on the forming surface, causing the material composition to vary in gradient in different directions within each powder spreading layer. By organically integrating the two independent powder feeding mechanisms, this powder feeding device can not only take into account powder spreading but also the fixed-point and fixed-region delivery of powders of different materials, greatly improving the powder utilization rate and multi-material applicability, and providing a brand-new technical solution combining powder spreading with multi-material powder leakage for the field of 3D printing technology.

Description

Technical Field

[0001] The present invention relates to the field of additive manufacturing, and particularly to a powder feeding device for selective laser melting digital material forming. Background Art

[0002] Digital material selective laser melting technology is an additive manufacturing technology that uses a variety of powder materials (at least one of which is a metal material) to prepare a single complex functional component with a variety of material structures.

[0003] Up to now, most commercial rapid prototyping machines are designed and manufactured starting from single-material products. 3D printing is often limited to using only one material at a time, or hybrid printing with different materials. It is difficult to meet the increasing complexity requirements of industrial products and the flexibility and efficiency requirements needed for market globalization.

[0004] However, digital materials have great potential for meeting the demanding requirements in certain fields. Digital materials have high strength and toughness, can not only withstand large mechanical stress and thermal stress, but also withstand a large temperature difference and maintain a long service life, which are excellent properties not possessed by traditional materials.

[0005] Currently, the research on digital material selective laser melting technology is still in the stage of scientific research breakthroughs, and commercial equipment is relatively rare. According to the method of freely arranging a variety of materials as needed between different layers or in different regions within the same layer, it can be mainly divided into two technical means: one is to achieve multi-material distribution in the Z-axis direction of the part; the other is to achieve multi-material distribution in the XY plane of the part. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned disadvantages and deficiencies of the prior art, and provide a powder feeding device for selective laser melting digital material forming. This device can accurately supply two or more kinds of powders always according to the required weight ratio, so that the powder ratio within each powder spreading layer is controllable; and it can accurately transport the selected powder to the predetermined laying position, enabling the material composition to change in a gradient manner in different directions within each powder spreading layer.

[0007] The present invention is achieved through the following technical solutions:

[0008] A powder feeding device for selective laser melting digital material forming, the powder feeding device is located above the powder spreading platform 1 in the forming chamber of a selective laser melting printer; the powder feeding device includes a first powder feeding mechanism 2 and a second powder feeding mechanism 3;

[0009] The first powder feeding mechanism 2 includes, arranged successively from top to bottom: a first powder storage bin 2-1, a powder weighing and proportioning bin 2-2, a rotating powder discharging bin 2-3, and a powder feeding channel 2-4;

[0010] Inside the first powder storage bin 2-1, there are multiple powder bins for storing powders of different materials; at the powder outlet of each powder bin, there is an independent powder leakage plate 2-5; the powder leakage plate 2-5 is used to open or close the opening degree of the powder outlet corresponding to the powder bin.

[0011] The powder weighing and proportioning bin 2-2 is used to weigh the powder from the first powder storage bin 2-1; at the bottom of the powder weighing and proportioning bin 2-2, there is a powder discharging valve 2-6.

[0012] The rotating powder discharging bin 2-3 is used to receive the powder after proportioning and mixing from the powder weighing and proportioning bin 2-2.

[0013] The powder feeding channel 2-4 is connected to the powder discharging valve 2-6 of the powder weighing and proportioning bin 2-2, and is used to convey the powder after proportioning and mixing to the powder spreading platform 1.

[0014] The rotating powder discharging bin 2-3 of the first powder feeding mechanism 2 includes: a rotating shaft 2-7 and a shaft sleeve 2-8.

[0015] The rotating shaft 2-7 is located inside the shaft sleeve 2-8 and can rotate relative to the shaft sleeve 2-8.

[0016] On the circumferential surface of the rotating shaft 2-7, there are multiple powder receiving grooves 2-11 for receiving powder; at the upper end surface of the shaft sleeve 2-8, corresponding to the powder discharging valve 2-6 of the powder weighing and proportioning bin 2-2, there is an upper notch 2-9 for receiving powder; at the lower end surface of the shaft sleeve 2-8, there is a lower notch 2-10 for discharging powder.

[0017] During powder receiving, the powder receiving groove 2-11 rotates to the upper notch 2-9. After the powder leaks into the powder receiving groove 2-11, the rotating shaft 2-7 rotates, and the powder is sent to the lower notch 2-10, and then sent to the powder spreading platform 1 through the powder feeding channel 2-4.

[0018] The second powder feeding mechanism 3 includes a second powder storage bin 3-1 and a powder leakage nozzle 3-2.

[0019] The second powder storage bin 3-1 is internally partitioned into multiple storage cells 3-3 for storing powders of different materials.

[0020] At the tail of the powder leakage nozzle 3-2, there are multiple independent powder channels 3-4; at the outlet of each powder channel 3-4, there is an independent powder leakage valve 3-5.

[0021] The powder outlet of each storage cell 3-3 of the second powder storage bin 3-1 is respectively connected to the powder channel 3-4 at the tail of the powder leakage nozzle 3-2 through an independent pipeline 3-6.

[0022] The powder leakage nozzle 3-2 is connected to one side of the longitudinal slide 4 in the forming chamber through the mounting bracket 3-7; during the printing operation, the selected or switched powder enters the powder leakage nozzle 3-2 through the corresponding pipeline 3-6 of the storage bin 3-3, and then is sent to the powder spreading platform 1 by the powder leakage nozzle 3-2.

[0023] The mounting bracket 3-7 is installed on the slide rail 3-9 of the longitudinal slide 4 through the slider 3-8; the longitudinal slide 4 is connected to the transverse slide 5;

[0024] The slider 3-8 moves linearly along the slide rail 3-9 of the longitudinal slide 4, and the longitudinal slide 4 moves linearly along the length direction of the transverse slide 5, thereby driving the powder leakage nozzle 3-2 to complete the translation in the X and Y directions, and realizing the (fixed-point) leakage of the powder into the selected area of the powder spreading platform 1.

[0025] The powder leakage plate 2-5 of the first powder storage bin 2-1 includes an upper powder leakage plate 2-51 and a lower powder leakage plate 2-52 that can translate relative to each other;

[0026] On the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52, powder leakage holes 2-53 are respectively provided; the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 are superposed on each other; by parallelly moving the powder leakage holes 2-53 on the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 to stagger their positions, variable pores are formed for controlling the closing degree of the powder outlet of the powder bin.

[0027] The shape of the powder leakage holes 2-53 on the upper powder leakage plate 2-51 is different from the shape of the powder leakage holes 2-53 on the lower powder leakage plate 2-52.

[0028] The shape of the powder leakage holes 2-53 on the upper powder leakage plate 2-51 is triangular, and the shape of the powder leakage holes 2-53 on the lower powder leakage plate 2-52 is rectangular.

[0029] The powder feeding channel 2-4 is a plate-like structure arranged obliquely or a rectangular pipe structure.

[0030] A strip-shaped notch 4-1 is provided on the longitudinal slide 4 in the forming chamber;

[0031] When the strip-shaped notch 4-1 of the longitudinal slide 4 moves below the powder feeding channel 2-4, the powder slides into the strip-shaped notch 4-1 from the powder channel and is sent to the powder spreading platform 1; a powder spreading brush 4-2 is installed on the longitudinal slide 4; when the longitudinal slide 4 moves, the powder is leveled or trimmed by the powder spreading brush 4-2.

[0032] Compared with the prior art, the present invention has the following advantages and effects:

[0033] 1. The first powder feeding mechanism 2 of the present invention includes, successively arranged from top to bottom: a first powder storage bin 2-1, a powder weighing and proportioning bin 2-2, a rotating powder discharging bin 2-3, and a powder feeding channel 2-4; inside the first powder storage bin 2-1, there are multiple powder bins for containing powders of different materials; at the powder outlet of each powder bin, there is an independent powder leakage plate 2-5; the powder leakage plate 2-5 is used to open or close the opening degree of the powder outlet corresponding to the powder bin; the powder weighing and proportioning bin 2-2 is used to weigh the powder from the first powder storage bin 2-1; at the bottom of the powder weighing and proportioning bin 2-2, there is a powder discharging valve 2-6; the rotating powder discharging bin 2-3 is used to receive the powder after the proportioning and mixing from the powder weighing and proportioning bin 2-2; the rotating powder discharging bin 2-3 of the present invention includes: a rotating shaft 2-7 and a shaft sleeve 2-8; the rotating shaft 2-7 is located inside the shaft sleeve 2-8 and can rotate relative to the shaft sleeve 2-8; on the circumferential surface of the rotating shaft 2-7, there are multiple powder receiving grooves 2-11 for receiving powders; at the upper end surface of the shaft sleeve 2-8, corresponding to the powder discharging valve 2-6 of the powder weighing and proportioning bin 2-2, there is an upper notch 2-9 for receiving powders; at the lower end surface of the shaft sleeve 2-8, there is a lower notch 2-10 for discharging powders; during powder receiving, the powder receiving groove 2-11 rotates to the upper notch 2-9, after the powder leaks into the powder receiving groove 2-11, the rotating shaft 2-7 rotates, and the powder is sent to the lower notch 2-10, and then sent into the powder spreading platform 1 through the powder feeding channel 2-4. With the above structure, in the printing operation, the quantitative proportioning and mixing operation process of the powder not only improves the proportioning accuracy but also shortens the proportioning time, overcoming the defects of traditional proportioning being cumbersome and time-consuming;

[0034] For the rotating powder discharging bin 2-3 of the present invention, the rotating shaft 2-7 and the shaft sleeve 2-8 are mutually matched; multiple powder receiving grooves 2-11 are arranged on the rotating shaft 2-7, realizing the quantitative transmission of powders of multiple materials by using one rotating shaft, with the advantages of simple structure, good mechanical stability, and accurate discharging.

[0035] 2. The powder leakage plate 2-5 of the first powder storage bin 2-1 of the present invention includes an upper powder leakage plate 2-51 and a lower powder leakage plate 2-52 that can translate relative to each other; powder leakage holes 2-53 are respectively opened on the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52; the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 are superposed on each other; by parallelly moving the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 to stagger the positions of the powder leakage holes 2-53, a variable pore is formed to control the closing degree of the powder outlet of the powder bin; the shape of the powder leakage hole 2-53 on the upper powder leakage plate 2-51 is triangular, and the shape of the powder leakage hole 2-53 on the lower powder leakage plate 2-52 is rectangular. This powder leakage method not only has a simple structure and good operability but also can more accurately control the powder discharge amount, achieving fine and precise control.

[0036] 3. The second powder storage bin 3-1 of the present invention is internally partitioned into multiple storage compartments 3-3 for containing powders of different materials. A plurality of independent powder channels 3-4 are provided at the tail of the powder leakage nozzle 3-2; independent powder leakage valves 3-5 are respectively provided at the outlets of each powder channel 3-4; the powder outlets of each storage compartment 3-3 are respectively connected to the powder channels 3-4 at the tail of the powder leakage nozzle 3-2 through independent pipes 3-6. The powder leakage nozzle 3-2 is connected to one side of the longitudinal slide 4 in the forming chamber through a mounting frame 3-7; during the printing operation, the selected or switched powder enters the powder leakage nozzle 3-2 through the corresponding pipe 3-6 of the storage compartment 3-3, and then is sent to the powder spreading platform 1 by the powder leakage nozzle 3-2. The mounting frame 3-7 is installed on the slide rail 3-9 of the longitudinal slide 4 through a slider 3-8; the longitudinal slide 4 is connected to the transverse slide 5; the slider 3-8 moves linearly along the slide rail 3-9 of the longitudinal slide 4, and the longitudinal slide 4 moves linearly along the length direction of the transverse slide 5, thereby driving the powder leakage nozzle 3-2 to complete the translation in the X and Y directions, realizing the (fixed-point) leakage of powders of different materials into the selected area of the powder spreading platform 1, forming a powder layer containing multiple powder materials; adopting this quantitative and powder leakage method for the selected area enables the same cross-section of the workpiece to contain different materials to meet the application requirements of the workpiece.

[0037] In summary, the powder feeding device of the present invention includes multi-material weighing and batching, which can ensure that two or more powder materials are always quantitatively and accurately supplied according to the required weight ratio, and the powder ratio within each powder spreading layer is controllable; and it can realize multi-material fixed-point transportation; accurately transport the specified material to the predetermined position on the forming surface, which can ensure the gradient change of the material composition in different directions within each powder spreading layer. The powder feeding device of the present invention, by organically integrating two independent powder feeding mechanisms, can not only take into account powder spreading but also take into account the fixed-point and fixed-area placement of powders of different materials, greatly improving the powder utilization rate and multi-material applicability, and providing a new technical solution for the 3D printing technology field regarding the combination of powder spreading and multi-material powder leakage. Brief Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of the powder feeding device for selective laser melting digital material forming of the present invention.

[0039] Figure 2 It is a schematic structural diagram of the first powder feeding mechanism 2 of the present invention.

[0040] Figure 3 It is a partial perspective view of the second powder storage bin 3-1 and the powder leakage nozzle 3-2 of the second powder feeding mechanism 3 of the present invention.

[0041] Figure 4 It is a schematic diagram of the multi-material planar distribution of the same powder layer on the forming plane of the present invention.

[0042] Figure 5 This is a schematic structural diagram of the powder leakage plate 2-5 of the first powder storage bin 2-1 of the present invention. Detailed implementation manners

[0043] The present invention will be further described in detail below in combination with specific embodiments.

[0044] As Figures 1-5 shown.

[0045] The present invention discloses a powder feeding device for selective laser melting digital material forming, including a laser device 7 and a forming cylinder lifting mechanism 6;

[0046] The powder feeding device of the present invention is located above the powder spreading platform 1 in the forming chamber of a selective laser melting printer; the powder feeding device includes a first powder feeding mechanism 2 and a second powder feeding mechanism 3;

[0047] The first powder feeding mechanism 2 includes, successively arranged from top to bottom: a first powder storage bin 2-1, a powder weighing and proportioning bin 2-2, a rotating powder discharging bin 2-3, and a powder feeding channel 2-4;

[0048] Inside the first powder storage bin 2-1, there are multiple powder bins for containing powders of different materials; an independent powder leakage plate 2-5 is provided at the powder outlet of each powder bin; the powder leakage plate 2-5 is used to open or close the opening degree of the powder outlet corresponding to the powder bin;

[0049] The powder weighing and proportioning bin 2-2 is used to weigh the powder from the first powder storage bin 2-1; a powder discharging valve 2-6 is provided at the bottom of the powder weighing and proportioning bin 2-2;

[0050] The rotating powder discharging bin 2-3 is used to receive the powder after being proportioned and mixed from the powder weighing and proportioning bin 2-2;

[0051] The powder feeding channel 2-4 is connected to the powder discharging valve 2-6 of the powder weighing and proportioning bin 2-2 and is used to convey the powder after being proportioned and mixed to the powder spreading platform 1.

[0052] The rotating powder discharging bin 2-3 of the first powder feeding mechanism 2 includes: a rotating shaft 2-7 and a shaft sleeve 2-8;

[0053] The rotating shaft 2-7 is located inside the shaft sleeve 2-8 and can rotate relative to the shaft sleeve 2-8;

[0054] On the circumferential surface of the rotating shaft 2-7, there are multiple powder receiving grooves 2-11 for receiving powder; on the upper end surface of the shaft sleeve 2-8, corresponding to the powder discharging valve 2-6 of the powder weighing and proportioning bin 2-2, there is an upper notch 2-9 for receiving powder; on the lower end surface of the shaft sleeve 2-8, there is a lower notch 2-10 for discharging powder;

[0055] During powder collection, the powder collection groove 2-11 rotates to the upper notch 2-9. After the powder drains into the powder collection groove 2-11, the rotating shaft 2-7 rotates and sends the powder to the lower notch 2-10, and then it is sent to the powder spreading platform 1 through the powder feeding channel 2-4.

[0056] The second powder feeding mechanism 3 includes a second powder storage bin 3-1 and a powder leakage nozzle 3-2;

[0057] The second powder storage bin 3-1 is internally partitioned into multiple storage compartments 3-3 for containing powders of different materials,

[0058] The tail of the powder leakage nozzle 3-2 is provided with multiple independent powder channels 3-4; independent powder leakage valves 3-5 are respectively arranged at the outlets of each powder channel 3-4;

[0059] The powder outlets of each storage compartment 3-3 of the second powder storage bin 3-1 are respectively connected to the powder channels 3-4 at the tail of the powder leakage nozzle 3-2 through independent pipes 3-6. The pipes 3-6 are flexible pipes, such as silicone materials.

[0060] The powder leakage nozzle 3-2 is connected to one side of the longitudinal slide 4 in the forming chamber through a mounting frame 3-7; during the printing operation, the selected or switched powder enters the powder leakage nozzle 3-2 through the pipe 3-6 corresponding to the storage compartment 3-3, and then is sent to the powder spreading platform 1 by the powder leakage nozzle 3-2.

[0061] The mounting frame 3-7 is installed on the slide rail 3-9 of the longitudinal slide 4 through a slider 3-8; the longitudinal slide 4 is connected to the transverse slide 5;

[0062] The slider 3-8 moves linearly along the slide rail 3-9 of the longitudinal slide 4, and the longitudinal slide 4 moves linearly along the length direction of the transverse slide 5, thereby driving the powder leakage nozzle 3-2 to complete the translation in the X and Y directions, realizing the (fixed-point) leakage of powders of different materials into the selected area of the powder spreading platform 1; as Figure 4 shown, the selected area is the same powder layer with powders of different materials, Figure 4 in which, A, B, and C represent powders of different materials. From Figure 4 the plane schematic diagram, it can be seen that in the same plane, different areas have powders of different materials.

[0063] The powder leakage plate 2-5 of the first powder storage bin 2-1 includes an upper powder leakage plate 2-5-1 and a lower powder leakage plate 2-5-2 that can translate relative to each other;

[0064] On the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52, powder leakage holes 2-53 are respectively formed; the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 are superposed with each other; the staggered positions of the powder leakage holes 2-53 on the upper powder leakage plate 2-51 and the lower powder leakage plate 2-52 are moved in parallel to form variable pores for controlling the closing degree of the powder outlet of the powder bin.

[0065] The shape of the powder leakage hole 2-53 of the upper powder leakage plate 2-51 is different from the shape of the powder leakage hole 2-53 of the lower powder leakage plate 2-52.

[0066] The shape of the powder leakage hole 2-53 of the upper powder leakage plate 2-51 is triangular, and the shape of the powder leakage hole 2-53 of the lower powder leakage plate 2-52 is rectangular. Of course, other shapes can be adopted according to specific requirements.

[0067] The powder feeding channel 2-4 is a plate-like structure arranged obliquely or a rectangular pipe structure. When the plate-like structure is adopted, the powder is conveyed on the surface of the plate-like structure; when the rectangular pipe structure is adopted, the powder is conveyed inside the rectangular pipe.

[0068] A strip-shaped notch 4-1 is formed on the longitudinal sliding table 4 in the forming chamber;

[0069] When the strip-shaped notch 4-1 of the longitudinal sliding table 4 moves below the powder feeding channel 2-4, the powder slides from the powder channel into the strip-shaped notch 4-1 and is sent onto the powder spreading platform 1; a powder spreading brush 4-2 is installed on the longitudinal sliding table 4; when the longitudinal sliding table 4 moves, the powder is leveled or trimmed by the powder spreading brush 4-2.

[0070] As described above, the present invention can be preferably realized.

[0071] The implementation manners of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement manners and are all included in the protection scope of the present invention.

Claims

1. A powder feeding device for selective laser melting digital material forming, the powder feeding device being located above a powder spreading platform (1) in a forming chamber of a selective laser melting printer; characterized in that, The powder feeding device includes a first powder feeding mechanism (2) and a second powder feeding mechanism (3); The first powder feeding mechanism (2) includes, successively arranged from top to bottom: a first powder storage bin (2-1), a powder weighing and proportioning bin (2-2), a rotating powder discharging bin (2-3), and a powder feeding channel (2-4); Inside the first powder storage bin (2-1), there are multiple powder bins for containing powders of different materials; an independent powder leakage plate (2-5) is provided at the powder outlet of each powder bin; the powder leakage plate (2-5) is used to open or close the opening degree of the powder outlet of the corresponding powder bin; The powder weighing and proportioning bin (2-2) is used to weigh the powder from the first powder storage bin (2-1); a powder discharging valve (2-6) is provided at the bottom of the powder weighing and proportioning bin (2-2); The rotating powder discharging bin (2-3) is used to receive the powder after being proportioned and mixed from the powder weighing and proportioning bin (2-2); The powder feeding channel (2-4) is connected to the powder discharging valve (2-6) of the powder weighing and proportioning bin (2-2), and is used to convey the powder after being proportioned and mixed to the powder spreading platform (1); The rotating powder discharging bin (2-3) of the first powder feeding mechanism (2) includes: a rotating shaft (2-7) and a shaft sleeve (2-8); The rotating shaft (2-7) is located inside the shaft sleeve (2-8) and can rotate relative to the shaft sleeve (2-8); A plurality of powder receiving grooves (2-11) for receiving powder are distributed on the circumferential surface of the rotating shaft (2-7); an upper notch (2-9) for receiving powder is opened on the upper end surface of the shaft sleeve (2-8) corresponding to the powder discharging valve (2-6) of the powder weighing and proportioning bin (2-2); a lower notch (2-10) for powder discharging is opened on the lower end surface of the shaft sleeve (2-8); During powder receiving, when the powder receiving groove (2-11) rotates to the upper notch (2-9), after the powder leaks into the powder receiving groove (2-11), the rotating shaft (2-7) rotates, and the powder is sent to the lower notch (2-10), and then is sent to the powder spreading platform (1) through the powder feeding channel (2-4); The second powder feeding mechanism (3) includes a second powder storage bin (3-1) and a powder leakage nozzle (3-2); The second powder storage bin (3-1) is internally partitioned into a plurality of storage grids (3-3) for containing powders of different materials, A plurality of independent powder channels (3-4) are provided at the tail of the powder leakage nozzle (3-2); an independent powder leakage valve (3-5) is provided at the outlet of each powder channel (3-4); The powder outlet of each storage grid (3-3) of the second powder storage bin (3-1) is respectively connected to the powder channel (3-4) at the tail of the powder leakage nozzle (3-2) through an independent pipeline (3-6); The powder leakage nozzle (3-2) is connected to one side of the longitudinal sliding table (4) in the forming chamber through a mounting bracket (3-7); during the printing operation, the selected or switched powder enters the powder leakage nozzle (3-2) through the pipeline (3-6) corresponding to the storage grid (3-3), and is then sent to the powder spreading platform (1) by the powder leakage nozzle (3-2); The powder leakage plate (2-5) of the first powder storage bin (2-1) includes an upper powder leakage plate (2-51) and a lower powder leakage plate (2-52) that can translate relative to each other; On the upper powder leakage plate (2-51) and the lower powder leakage plate (2-52), powder leakage holes (2-53) are respectively formed; the upper powder leakage plate (2-51) and the lower powder leakage plate (2-52) are superposed on each other; by parallelly moving the upper powder leakage plate (2-51) and the lower powder leakage plate (2-52) to stagger the positions of the powder leakage holes (2-53), variable pores are formed to control the closing degree of the powder outlet of the powder bin.

2. The powder feeding device for selective laser melting digital material forming according to claim 1, wherein The mounting frame (3-7) is installed on the slide rail (3-9) of the longitudinal slide table (4) through a slider (3-8); the longitudinal slide table (4) is connected to the transverse slide table (5); The slider (3-8) moves linearly along the slide rail (3-9) of the longitudinal slide table (4), and the longitudinal slide table (4) moves linearly along the length direction of the transverse slide table (5), thereby driving the powder leakage nozzle (3-2) to complete translation in the X and Y directions, so as to realize leaking powder into a selected area of the powder spreading platform (1).

3. The powder feeding device for selective laser melting digital material forming according to claim 2, wherein, The shape of the powder leakage hole (2-53) of the upper powder leakage plate (2-51) is different from the shape of the powder leakage hole (2-53) of the lower powder leakage plate (2-52).

4. The powder feeding device for selective laser melting digital material forming according to claim 2, wherein The shape of the powder leakage hole (2-53) of the upper powder leakage plate (2-51) is triangular, and the shape of the powder leakage hole (2-53) of the lower powder leakage plate (2-52) is rectangular.

5. The powder feeding device for selective laser melting digital material forming according to claim 2, characterized in that, The powder feeding channel (2-4) is a plate-like structure arranged obliquely.

6. The powder feeding device for selective laser melting digital material forming according to claim 2, characterized in that, A strip-shaped notch (4-1) is formed on the longitudinal slide table (4) in the molding chamber; When the strip-shaped notch (4-1) of the longitudinal slide table (4) moves below the powder feeding channel (2-4), the powder slides into the strip-shaped notch (4-1) from the powder feeding channel and is sent onto the powder spreading platform (1); a powder spreading brush (4-2) is installed on the longitudinal slide table (4); when the longitudinal slide table (4) moves, the powder is leveled by the powder spreading brush (4-2).

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