阅读说明：本技术 一种粉末腔流化结构 (Powder cavity fluidized structure ) 是由 陈家春 韩品连 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种粉末腔流化结构,包括粉末腔和气体室；所述气体室和粉末腔之间设有通道；所述通道的下方设有基轴；所述气体室的上方设有激光头,且在所述气体室的顶部设有激光保护镜；所述基轴下方设有排气结构,且在所述排气结构上设有排气管；所述排气管的出气端还设有排气块；所述排气结构通过连接架固定连接在所述基轴上；所述排气结构上还设有软管；所述气体室上设有与所述软管一端连通的出气管,且在所述出气管上还设有气泵；所述出气管上还设有回气管；本发明通过排气管,较好的将从气体室排出的气体通入到粉末腔中,并且通过气体的浮动,带动粉末腔内金属粉末流动,减少金属粉末对已完成部分的阻碍,保证较好的打印质量。(The invention discloses a powder cavity fluidization structure, which comprises a powder cavity and a gas chamber; a channel is arranged between the gas chamber and the powder cavity; a base shaft is arranged below the channel; a laser head is arranged above the gas chamber, and a laser protective lens is arranged at the top of the gas chamber; an exhaust structure is arranged below the base shaft, and an exhaust pipe is arranged on the exhaust structure; the air outlet end of the exhaust pipe is also provided with an exhaust block; the exhaust structure is fixedly connected to the base shaft through a connecting frame; the exhaust structure is also provided with a hose; the air chamber is provided with an air outlet pipe communicated with one end of the hose, and the air outlet pipe is also provided with an air pump; the air outlet pipe is also provided with an air return pipe; the invention better leads the gas exhausted from the gas chamber into the powder cavity through the exhaust pipe, and drives the metal powder in the powder cavity to flow through the floating of the gas, thereby reducing the obstruction of the metal powder to the finished part and ensuring better printing quality.)

1. A powder chamber fluidization structure, characterized by: comprises a powder cavity (1) and a gas chamber (2) fixed above the powder cavity (1); a channel for communicating the gas chamber (2) with the powder cavity (1) is arranged between the gas chamber (2) and the powder cavity (1); a movable base shaft (3) is arranged in the powder cavity (1) below the channel; a laser head (4) is arranged above the gas chamber (2) corresponding to the channel, and a laser protective lens (41) is arranged at the top of the gas chamber (2); an exhaust structure (5) is arranged below the base shaft (3), and at least one exhaust pipe (51) is arranged on the exhaust structure (5); the gas outlet end of the exhaust pipe (51) is also provided with an exhaust block (52) for preventing metal powder from entering the exhaust pipe (51); the exhaust structure (5) is fixedly connected to the base shaft (3) through a connecting frame (53); the exhaust structure (5) is also provided with a hose (54) communicated to the outer side of the powder cavity (1); an air outlet pipe (21) communicated with one end of the hose (54) extending out of the powder cavity (1) is arranged on the air chamber (2), and an air pump (6) is also arranged on the air outlet pipe (21); the gas outlet pipe (21) is also provided with a gas return pipe (22) communicated to the gas chamber (2).

2. A powder chamber fluidization structure according to claim 1, wherein: and a gas filtering device (7) is also arranged on the gas outlet pipe (21) between the gas chamber (2) and the gas pump (6), and the gas filtering device (7) is a filter core.

3. A powder chamber fluidization structure according to claim 1, wherein: a first control valve (56) is arranged on the air outlet pipe (21) between the hose (54) and the air pump (6).

4. A powder chamber fluidization structure according to claim 3, wherein: and a second control valve (55) is arranged on the air return pipe (22).

5. A powder chamber fluidization structure according to claim 1, wherein: an air inlet pipe (23) and an air outlet pipe (24) are arranged on the gas chamber (2); a third control valve (25) is arranged on the air inlet pipe (23); and a fourth control valve (26) is arranged on the exhaust pipe (24).

6. A powder chamber fluidization structure according to claim 1, wherein: the cross section of the exhaust structure (5) is rectangular; the exhaust pipes (51) are all arranged on the top surface of the exhaust structure (5).

7. A powder chamber fluidization structure according to claim 1, wherein: the cross section of the exhaust structure (5) is triangular; each side surface of the exhaust structure (5) is provided with a plurality of exhaust pipes (51).

Technical Field

The invention relates to the field of base shaft type SLM equipment, in particular to a powder cavity fluidization structure.

Background

SLM, selective laser melting, is a more industrial method of 3D printing, moving a roller to push metal particles through a printing area, then powerful laser will track the current layer of the object to be printed, selectively fuse some particles together according to the designed model, once the current layer is completed, the powder spreading device moves back and forth again to bring a new layer of metal particles, when SLM is used, the metal particles are actually completely fused and they are fused together more firmly to form an extremely strong object, this manufacturing way makes printing possible to finish the parts that require multiple parts to be spliced in a conventional manufacturing process at one time, which further reduces the possibility of faults or errors in the assembly process, based on the benefits of this method, they are used in industries with very low tolerance, such as aerospace, mainly for 3D printing parts of small aircraft engines, mostly be rotary part, can shorten the research and development cycle that novel aerospace was equipped, optimize the part structure, weight reduction reduces stress concentration, increases life, also can be used for the restoration of part to take shape to and cooperate with traditional manufacturing technology, the intercommunication is complementary.

In the prior art, the base shaft and a part of the finished part need to rotate in the powder cavity filled with metal powder during the operation process, and the part is subjected to the resistance of the powder in the tangential direction of rotation due to the problem of powder fluidity during the rotation process. For parts with thin structures or radial thin supporting structures, the structures can be subjected to bending deformation due to resistance, so that the printing position is deviated from the actual position of the part when the next layer rotates to the same position, and the printing is influenced.

And prior art devices require filling the powder chamber with metal powder to full capacity during the manufacturing process, which is most likely to be performed in an environment with a high oxygen content, including an air environment. Resulting in a higher interstitial oxygen content of the powder. The space occupied by the powder gaps can reach 50% of the total space. The entire powder chamber is also enriched with oxygen at the start of printing. Oxygen in the powder gap can diffuse to the printing surface during printing, so that the laser melted surface is oxidized, and various properties of the inner part and the surface of the part are affected.

Based on the above situation, the present invention provides a powder chamber fluidization structure, which can effectively solve the above problems.

Disclosure of Invention

The invention aims to provide a powder cavity fluidization structure. The powder cavity fluidization structure is simple in structure and convenient to use, gas exhausted from the gas chamber is better introduced into the powder cavity through the exhaust pipe, and metal powder in the powder cavity is driven to flow through the floating of the gas, so that the obstruction of the metal powder to the finished part is reduced, and the better printing quality is ensured; the exhaust structure is fixedly connected to the base shaft through the connecting frame and moves synchronously along with the movement of the base shaft, so that the exhaust structure can better enable metal powder near the base shaft to flow.

The invention is realized by the following technical scheme:

a powder cavity fluidization structure comprising a powder cavity and a gas chamber fixed above the powder cavity; a channel for communicating the gas chamber with the powder cavity is arranged between the gas chamber and the powder cavity; a movable base shaft is arranged in the powder cavity below the channel; a laser head is arranged above the gas chamber corresponding to the channel, and a laser protective lens is arranged at the top of the gas chamber; an exhaust structure is arranged below the base shaft, and at least one exhaust pipe is arranged on the exhaust structure; the gas outlet end of the exhaust pipe is also provided with an exhaust block for preventing metal powder from entering the exhaust pipe; the exhaust structure is fixedly connected to the base shaft through a connecting frame; the exhaust structure is also provided with a hose communicated to the outer side of the powder cavity; the gas chamber is provided with a gas outlet pipe communicated with one end of the hose extending to the outer side of the powder cavity, and the gas outlet pipe is also provided with a gas pump; and the gas outlet pipe is also provided with a gas return pipe communicated to the gas chamber.

According to the invention, the gas exhausted from the gas chamber is better introduced into the powder cavity through the exhaust pipe, and the floating of the gas drives the metal powder in the powder cavity to flow, so that the obstruction of the metal powder to the finished part is reduced, and the better printing quality is ensured; the exhaust structure is fixedly connected to the base shaft through the connecting frame and moves synchronously with the movement of the base shaft, so that the exhaust structure can better enable metal powder near the base shaft to flow.

Preferably, an air filtering device is further arranged on the air outlet pipe between the air chamber and the air pump, and the air filtering device is a filter element.

Preferably, a first control valve is arranged on an air outlet pipe between the hose and the air pump.

Preferably, the air return pipe is provided with a second control valve.

Preferably, the gas chamber is provided with a gas inlet pipe and a gas outlet pipe; a third control valve is arranged on the air inlet pipe; and a fourth control valve is arranged on the exhaust pipe.

Preferably, the cross-sectional shape of the exhaust structure is rectangular; the exhaust pipes are arranged on the top surface of the exhaust structure.

Preferably, the cross-sectional shape of the exhaust structure is a triangle; each side of the exhaust structure is provided with a plurality of exhaust pipes.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the powder cavity fluidization structure is simple in structure and convenient to use, gas exhausted from the gas chamber is better introduced into the powder cavity through the exhaust pipe, and metal powder in the powder cavity is driven to flow through the floating of the gas, so that the obstruction of the metal powder to the finished part is reduced, and the better printing quality is ensured; the exhaust structure is fixedly connected to the base shaft through the connecting frame and moves synchronously along with the movement of the base shaft, so that the exhaust structure can better enable metal powder near the base shaft to flow.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Example 1:

as shown in fig. 1, a powder chamber fluidization structure includes a powder chamber 1 and a gas chamber 2 fixed above the powder chamber 1; a channel for communicating the gas chamber 2 with the powder cavity 1 is arranged between the gas chamber 2 and the powder cavity 1; a movable base shaft 3 is arranged in the powder cavity 1 below the channel; a laser head 4 is arranged above the gas chamber 2 corresponding to the channel, and a laser protective lens 41 is arranged at the top of the gas chamber 2; an exhaust structure 5 is arranged below the base shaft 3, and at least one exhaust pipe 51 is arranged on the exhaust structure 5; the gas outlet end of the exhaust pipe 51 is also provided with an exhaust block 52 for preventing metal powder from entering the exhaust pipe 51; the exhaust structure 5 is fixedly connected to the base shaft 3 through a connecting frame 53; the exhaust structure 5 is also provided with a hose 54 communicated to the outer side of the powder cavity 1; an air outlet pipe 21 communicated with one end of the hose 54 extending out of the powder cavity 1 is arranged on the air chamber 2, and an air pump 6 is also arranged on the air outlet pipe 21; the air outlet pipe 21 is also provided with an air return pipe 22 communicated to the air chamber 2.

According to the invention, the gas exhausted from the gas chamber 2 is better introduced into the powder cavity 1 through the exhaust pipe 51, and the floating of the gas drives the metal powder in the powder cavity 1 to flow, so that the obstruction of the metal powder to the finished part is reduced, and the better printing quality is ensured; the exhaust structure 5 is fixedly connected to the base shaft 3 through the connecting frame 53, and the exhaust structure 5 moves synchronously with the movement of the base shaft 3, so that the exhaust structure 5 can better enable the metal powder near the base shaft 3 to flow.

Through the end of giving vent to anger of blast pipe 51 is equipped with the exhaust block not only can prevent that metal powder from getting into and leading to in the blast pipe 51 blocks up, can also disperse the gaseous flow velocity of blast pipe 51 combustion gas slows down gaseous, avoids gaseous impact too big to lead to metal powder to fly upward.

The base shaft 3 is mostly surrounded by the powder in the powder chamber 1, and the base shaft 3 is movable up and down and rotatable about its own axis.

The gas in the gas chamber 2 is inert gas.

Further, in another embodiment, a gas filtering device 7 is further disposed on the gas outlet pipe 21 between the gas chamber 2 and the gas pump 6, and the gas filtering device 7 is a filter element.

The gas filtering device 7 filters the gas from the gas chamber 2, separates metal powder carried in the gas, and prevents the metal powder from entering the exhaust structure 5 to block the exhaust pipe 51.

Further, in another embodiment, a first control valve 56 is provided on the air outlet pipe 21 between the hose 54 and the air pump 6.

The air outlet state of the air outlet structure 5 is controlled by the first control valve 56.

Further, in another embodiment, a second control valve 55 is disposed on the air return pipe 22.

Further, in another embodiment, an air inlet pipe 23 and an air outlet pipe 24 are arranged on the gas chamber 2; and a third control valve 25 is arranged on the air inlet pipe 23; a fourth control valve 26 is arranged on the exhaust pipe 24.

Through intake pipe 23 and blast pipe 24, let in a large amount of inert gas earlier before SLM equipment starts, discharge the oxygen in the SLM equipment, avoid printing the oxygen in-process powder clearance can spread to printing the surface for the surface that the laser melts is by oxidation, influences the inside of part and surperficial each item performance.

Further, in another embodiment, the cross-sectional shape of the exhaust structure 5 is rectangular; the exhaust pipes 51 are all disposed on the top surface of the exhaust structure 5.

Example 2:

as shown in fig. 2, a powder chamber fluidization structure includes a powder chamber 1 and a gas chamber 2 fixed above the powder chamber 1; a channel for communicating the gas chamber 2 with the powder cavity 1 is arranged between the gas chamber 2 and the powder cavity 1; a movable base shaft 3 is arranged in the powder cavity 1 below the channel; a laser head 4 is arranged above the gas chamber 2 corresponding to the channel, and a laser protective lens 41 is arranged at the top of the gas chamber 2; an exhaust structure 5 is arranged below the base shaft 3, and at least one exhaust pipe 51 is arranged on the exhaust structure 5; the gas outlet end of the exhaust pipe 51 is also provided with an exhaust block 52 for preventing metal powder from entering the exhaust pipe 51; the exhaust structure 5 is fixedly connected to the base shaft 3 through a connecting frame 53; the exhaust structure 5 is also provided with a hose 54 communicated to the outer side of the powder cavity 1; an air outlet pipe 21 communicated with one end of the hose 54 extending out of the powder cavity 1 is arranged on the air chamber 2, and an air pump 6 is also arranged on the air outlet pipe 21; the gas outlet pipe 21 is also provided with a gas outlet pipe 51 which is communicated with the gas outlet device, so that gas exhausted from the gas chamber 2 is better introduced into the powder cavity 1, and the floating of the gas drives metal powder in the powder cavity 1 to flow, thereby reducing the obstruction of the metal powder to the finished part and ensuring better printing quality; the exhaust structure 5 is fixedly connected to the base shaft 3 through the connecting frame 53, and the exhaust structure 5 moves synchronously with the movement of the base shaft 3, so that the exhaust structure 5 can better enable the metal powder near the base shaft 3 to flow.

Through the end of giving vent to anger of blast pipe 51 is equipped with the exhaust block not only can prevent that metal powder from getting into and leading to in the blast pipe 51 blocks up, can also disperse the gaseous flow velocity of blast pipe 51 combustion gas slows down gaseous, avoids gaseous impact too big to lead to metal powder to fly upward.

The base shaft 3 is mostly surrounded by the powder in the powder chamber 1, and the base shaft 3 is movable up and down and rotatable about its own axis.

The gas in the gas chamber 2 is inert gas.

Further, in another embodiment, a gas filtering device 7 is further disposed on the gas outlet pipe 21 between the gas chamber 2 and the gas pump 6, and the gas filtering device 7 is a filter element.

The gas filtering device 7 filters the gas from the gas chamber 2, separates metal powder carried in the gas, and prevents the metal powder from entering the exhaust structure 5 to block the exhaust pipe 51.

Further, in another embodiment, a first control valve 56 is provided on the air outlet pipe 21 between the hose 54 and the air pump 6.

The air outlet state of the air outlet structure 5 is controlled by the first control valve 56.

Further, in another embodiment, a second control valve 55 is disposed on the air return pipe 22.

Further, in another embodiment, an air inlet pipe 23 and an air outlet pipe 24 are arranged on the gas chamber 2; and a third control valve 25 is arranged on the air inlet pipe 23; a fourth control valve 26 is arranged on the exhaust pipe 24.

Through intake pipe 23 and blast pipe 24, let in a large amount of inert gas earlier before SLM equipment starts, discharge the oxygen in the SLM equipment, avoid printing the oxygen in-process powder clearance can spread to printing the surface for the surface that the laser melts is by oxidation, influences the inside of part and surperficial each item performance.

Further, in another embodiment, the cross-sectional shape of the exhaust structure 5 is triangular; a plurality of the exhaust pipes 51 are provided on each side of the exhaust structure 5.

The cross-sectional shape of the gas discharge structure 5 is triangular, so that the gas discharge structure 5 can better move in the metal powder in the powder chamber 1.

The powder chamber fluidization structure of the present invention can be easily manufactured or used by those skilled in the art according to the description of the present invention and the attached drawings, and can produce the positive effects described in the present invention.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.