CN114939677A

CN114939677A - Forming cylinder equipment for 3D printing and operation method

Info

Publication number: CN114939677A
Application number: CN202210620117.4A
Authority: CN
Inventors: 李建杰; 王冠博; 何刚文; 张士亨; 马治博
Original assignee: Ji Hua Laboratory
Current assignee: Ji Hua Laboratory
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-08-26
Anticipated expiration: 2042-06-02
Also published as: CN114939677B

Abstract

The application relates to the technical field of 3D printing equipment, and discloses forming cylinder equipment for 3D printing and an operation method, wherein the forming cylinder equipment comprises a forming cylinder body and a printing platform, the printing platform is arranged in the forming cylinder body, the printing platform is connected with the inner wall of the forming cylinder body in a sliding and sealing manner, a powder cleaning assembly and a gas washing assembly are arranged on the outer side of the forming cylinder body, and the printing platform can move to the positions above and below the powder cleaning assembly and the gas washing assembly; the powder cleaning assembly is used for sucking metal powder in the forming cylinder body, and the air washing assembly is used for spraying air into the forming cylinder body. The forming cylinder equipment for 3D printing provided by the invention can be used for washing the inside of the forming cylinder body before 3D printing is carried out, and cleaning the inside of the forming cylinder body after printing is finished, so that the forming cylinder body has the integrated functions of cleaning powder and washing gas, and the working efficiency is improved.

Description

Forming cylinder equipment for 3D printing and operation method

Technical Field

The invention belongs to the technical field of 3D printing equipment, and particularly relates to forming cylinder equipment for 3D printing and an operation method.

Background

In recent years, the rapid development of additive manufacturing technology, especially the large application of metal additive technology in commercial and military fields, has led to the continuous increase of the printing size of 3D printing equipment, the increasing size of the forming cylinder for carrying metal powder and forming parts, and the subsequent difficulty in cleaning the powder.

At present, the molding cylinder device only has a single molding function, namely bears printing platform, metal powder and molding part in the printing process, does not have the functions of gas washing and powder cleaning, more gas washing before printing is completed through a printing bin, the powder cleaning function needs to be moved to an independent part taking bin after printing is completed to clean powder in the earlier stage, and the inconvenience of the molding cylinder with the single function is further amplified on a large-scale 3D printing device. In addition, because metal powder has the explosive risk under the condition that oxygen content is high, so get a storehouse not only to match the shaping size, still need have strict gas tightness and separate purge function, this has just caused the printing size to increase simultaneously, gets a size in storehouse and is also increasing, and then printing apparatus's size is constantly increasing.

Accordingly, the prior art is in need of improvement and development.

Disclosure of Invention

The application aims to provide forming cylinder equipment for 3D printing and an operation method, integrates the functions of gas washing, 3D printing and powder cleaning, and can improve the working efficiency.

In a first aspect, the application provides a forming cylinder device for 3D printing, which comprises a forming cylinder body and a printing platform, wherein the printing platform is arranged inside the forming cylinder body and connected with the inner wall of the forming cylinder body in a sliding and sealing manner, a powder cleaning assembly and a gas washing assembly are arranged outside the forming cylinder body, and the printing platform can move above and below the powder cleaning assembly and the gas washing assembly; the powder cleaning assembly is used for sucking metal powder in the forming cylinder body, and the air washing assembly is used for spraying air into the forming cylinder body.

The application provides a forming cylinder equipment for 3D prints through set up the washing gas subassembly and clear powder subassembly in the forming cylinder body outside, can carry out 3D and print the inside washing gas that carries on of forming cylinder body before, print and accomplish the back and clear powder to forming cylinder body inside, make the forming cylinder body possess the integration function of clear powder and washing gas, improved work efficiency.

Further, the forming cylinder device for 3D printing, the cross section of the forming cylinder body is rectangular.

Further, according to the molding cylinder equipment for 3D printing, one side surface of the molding cylinder body is provided with a plurality of air inlets, and the other three side surfaces of the molding cylinder body are provided with a plurality of powder suction ports; the air inlet is connected with the air washing assembly; the powder suction port is connected with the powder cleaning component.

In practical application, because the metal powder can be scattered at each corner of the printing platform, the powder suction ports are arranged on three side surfaces of the forming cylinder body, and the powder can be sucked from three directions; and an air intake is left for to remaining side, and the air intake can be bloied, owing to only blow along a direction, induced draft by other three directions simultaneously (can induced draft when inhaling the powder), can avoid a plurality of directions to blow and produce the turbulent flow and make metal powder scatter everywhere (if scatter everywhere, probably spill over from shaping jar body upper portion), metal powder can be siphoned away more fast. Through the arrangement mode, the powder cleaning effect can be improved.

Further, in the molding cylinder device for 3D printing, the plurality of air inlets are uniformly arranged along a straight line perpendicular to a central axis of the molding cylinder body; the powder suction ports are uniformly distributed along a straight line perpendicular to the central axis of the forming cylinder body; the height position of the air inlet is higher than that of the powder suction port.

In practical application, a plurality of air inlets and powder suction ports are uniformly distributed on the side surface of the forming cylinder body in a manner of being vertical to the central axis of the forming cylinder body, so that the air blowing area and the powder suction area can be increased; in addition, the height of the air inlet is set to be higher than the powder suction port, so that residual metal powder is conveniently blown to the powder suction port, and the powder cleaning efficiency is further improved.

Further, a forming cylinder equipment for 3D prints, clear powder subassembly includes that the U-shaped inhales the powder pipeline, the U-shaped inhale powder pipeline on set up with inhale the opening of powder mouth adaptation, the U-shaped inhale powder pipeline around establishing the outside of forming cylinder body, just the opening with inhale the powder mouth one-to-one and be connected.

Further, print platform with the inner chamber looks adaptation of shaping jar body, just print platform's global cover is equipped with at least one sealing washer.

The sealing ring is arranged on the circumferential surface of the printing platform, so that the sealing performance can be improved, gas leakage is prevented, and the enclosed space enclosed by the printing platform and the forming cylinder body is kept in an inert atmosphere during 3D printing; but also prevents the metal powder from falling to the bottom of the forming cylinder body.

Further, the forming cylinder equipment for 3D printing, the edge of the air inlet close to the top of the forming cylinder body is inverted with a first inclined surface, and the first inclined surface inclines towards the bottom of the forming cylinder body.

Further, a forming cylinder device for 3D printing, the powder sucking port is close to the edge of the bottom of the forming cylinder body is inverted to be provided with a second inclined surface, and the second inclined surface inclines towards the top of the forming cylinder body.

Further, the forming cylinder equipment for 3D printing, the air washing assembly comprises an air blowing cover, the air blowing cover is arranged on the outer side of the air blowing opening, the air blowing cover is provided with an air inlet, and the width of the part, close to the air inlet, of the air blowing cover is smaller than that of the part, far away from the air inlet, of the air blowing cover.

In a second aspect, the present application further provides an operation method of a forming cylinder device for 3D printing, which is applied to the forming cylinder device for 3D printing in the first aspect, and includes the steps of:

A1. sliding the printing platform to a position below the scrubbing assembly;

A2. starting the gas washing assembly to spray inert gas into the forming cylinder body for gas washing;

A3. sliding the printing platform to a position higher than the scrubbing assembly and the dusting assembly;

A4. printing a workpiece on the printing platform in an inert gas environment;

A5. sliding the printing platform to a position lower than the gas washing assembly and the powder cleaning assembly;

A6. starting the powder cleaning assembly to preliminarily pump the metal powder in the forming cylinder body;

A7. starting the gas washing assembly again to spray gas into the forming cylinder body, and simultaneously sucking residual metal powder by using the powder cleaning assembly;

A8. and taking out the workpiece.

The application provides an operation method for forming cylinder equipment for 3D prints moves different positions through adjusting print platform, just can realize the work of gas washing and clear powder, and convenient and fast helps improving work efficiency.

According to the forming cylinder equipment for 3D printing, the air washing component and the powder cleaning component are arranged on the outer side of the forming cylinder body, so that the inside of the forming cylinder body can be washed before 3D printing is carried out, and the powder cleaning is carried out on the inside of the forming cylinder body after the printing is finished, so that the forming cylinder body has the integrated functions of powder cleaning and air washing, and the working efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of a forming cylinder device for 3D printing according to the present application.

Fig. 2 is a schematic structural diagram of a forming cylinder body provided by the present application.

Fig. 3 is a schematic structural diagram of a U-shaped powder suction duct provided by the present application.

Fig. 4 is an enlarged view of a portion a in fig. 2.

Fig. 5 is a schematic structural diagram of a printing platform provided in the present application.

Fig. 6 is a schematic structural diagram of a blowing cover provided by the present application.

Fig. 7 is a schematic cross-sectional structural diagram of a molding cylinder device for 3D printing according to the present application when printing is performed.

Fig. 8 is a schematic cross-sectional structure diagram of a forming cylinder device for 3D printing according to the present application when performing purging and powder cleaning.

Description of reference numerals: 100. forming a cylinder body; 110. An air inlet; 111. a first inclined plane; 120. a powder suction port; 121. a second inclined surface; 200. a printing platform; 210. a seal ring; 300. a powder cleaning component; 310. a U-shaped powder suction pipeline; 400. a scrubbing assembly; 410. a blower housing; 411. an air inlet.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

As shown in fig. 1, the forming cylinder device for 3D printing according to the present invention comprises a forming cylinder body 100 and a printing platform 200, wherein the printing platform 200 is disposed inside the forming cylinder body 100, and the printing platform 200 is connected with the inner wall of the forming cylinder body 100 in a sliding and sealing manner, wherein a powder cleaning assembly 300 and a gas cleaning assembly 400 are disposed outside the forming cylinder body 100, and the printing platform 200 can be moved above and below the powder cleaning assembly 300 and the gas cleaning assembly 400; the dusting assembly 300 is used for sucking the metal powder in the forming cylinder body 100, and the air washing assembly 400 is used for spraying air into the forming cylinder body 100.

Wherein, print platform 200's bottom generally is provided with automatic elevating system, can be motor drive or cylinder, oil cylinder drive's elevating system, and this application does not do specific details here. Printing deck 200 also includes a heating plate and a printing substrate. The printing platform 200 is used for placing a mold for printing and metal powder.

In practical use, before printing of a workpiece, an inert gas is sprayed into the forming cylinder body 100 through the gas washing assembly 400 for washing, so that a space (hereinafter referred to as a building bin) at the upper part of the printing platform 200 in the forming cylinder body 100 is filled with the inert gas, further, the workpiece is printed in an inert gas environment, oxidation of the workpiece in the printing process is effectively avoided, here, the oxygen content in the forming cylinder body 100 is monitored through an oxygen measuring device to control the work of the gas washing assembly 400, and when the oxygen content in the building bin is lower than a preset threshold value, the gas washing can be stopped.

The shape and size of the cross section (i.e., the cross section perpendicular to the lifting direction) of the printing platform 200 should be matched with the shape and size of the cross section of the forming cylinder body 100, so that the sealing performance between the printing platform 200 and the forming cylinder body 100 can be ensured.

The powder cleaning assembly 300 can comprise a pipeline and a powder suction machine, wherein the powder suction machine is communicated with the forming cylinder body 100 through the pipeline, so that powder is sucked from the inside of the forming cylinder body 100; the purge assembly 400 may include an air tube and a blower, the blower may be communicated with the forming tub body 100 through the air tube, and the forming tub body 100 may also be communicated with an inert gas source through the air tube, thereby achieving blowing of air into the forming tub body 100. In addition, both the pipeline and the air pipe can be hung and fixed on the outer side of the forming cylinder body 100 in an externally hanging manner, or the powder suction machine, the inert gas source and the blower are arranged on the ground, which is not specifically limited in this application.

By last can know, the forming cylinder equipment that is used for 3D to print that this application provided can carry out the gas washing to forming cylinder body 100 inside before carrying out 3D printing through set up gas washing subassembly 400 and clear powder subassembly 300 in the forming cylinder body 100 outside, prints and accomplishes the back and clear powder to forming cylinder body 100 inside, makes forming cylinder body 100 possess the integration function of clear powder and gas washing, has improved work efficiency.

In some embodiments, the forming cylinder body 100 may be cylindrical, or a polygonal cylinder.

In some preferred embodiments, the forming cylinder body 100 is rectangular in cross-section. In practical applications, the printing platform 200 is mostly a rectangular plane, and the rectangular cross section of the forming cylinder body 100 can be better matched with the printing platform 200. Meanwhile, the side surface of the forming cylinder body 100 of the rectangular body is flat, and other equipment such as the powder cleaning assembly 300 and the gas washing assembly 400 are convenient to install.

Referring to fig. 2, in some embodiments, one side of the forming cylinder body 100 is provided with a plurality of air inlets 110, and the other three sides of the forming cylinder body 100 are provided with a plurality of powder suction ports 120; the air inlet 110 is connected with the air washing assembly 400; the powder suction port 120 is connected with the powder cleaning component 300. The air inlet 110 and the powder suction port 120 may be square, diamond, circular, or other polygonal geometric shapes, which are not limited in this application. In practical application, since the metal powder is scattered at each corner of the printing platform 200, the powder suction ports 120 are disposed at three sides of the forming cylinder body 100, so that the powder can be sucked from three directions; and the remaining side surface is left for the air inlet 110, and the air inlet 110 can blow air to blow away the metal powder near the air inlet 110, so as to clean the metal powder in each direction of the printing platform 200. Through the arrangement mode, the powder cleaning effect can be improved. In addition, on-off valves (e.g., electromagnetic valves) may be disposed near the powder suction port 120 and the air inlet 110, and by providing the on-off valves, when powder is to be sucked into the forming cylinder body 100, the on-off valves at the powder suction port 120 may be opened to suck the powder; and then opening an on-off valve of the air inlet 110, and blowing air into the forming cylinder body by connecting a fan or an inert gas source to form air flow so that the metal powder flows towards the powder suction port 120 until the powder is cleaned. When the powder suction is finished, the on-off valves at the powder suction port 120 and the air inlet 110 are closed to keep the tightness and prevent the metal powder from flying out.

In a further embodiment, the plurality of air intakes 110 are uniformly arranged along a straight line perpendicular to the central axis of the forming cylinder body 100; the plurality of powder suction ports 120 located on the same side are uniformly arranged along a straight line perpendicular to the central axis of the forming cylinder body 100; the height of the air inlet 110 is higher than that of the powder suction port 120. The central axis direction of the forming cylinder body 100 is the same as the sliding direction of the printing platform inside the forming cylinder body 100. In practical application, the plurality of air inlets 110 and the powder suction ports 120 are uniformly distributed in a manner of being perpendicular to the central axis of the forming cylinder body 100 and arranged in a straight line, so that the air blowing area and the powder suction area can be increased; in addition, the height of the air inlet 110 is set to be higher than that of the powder suction port 120, so that residual metal powder is conveniently blown to the powder suction port 120, and the powder cleaning efficiency is further improved. In some embodiments, the powder suction ports 120 on each side are all at the same height position, but are not limited thereto.

In some embodiments, each powder suction port 120 may be individually equipped with a pipe, and each pipe is connected to a powder suction machine.

In some preferred embodiments, the powder cleaning assembly 300 includes a U-shaped powder suction pipe 310, an opening matched with the powder suction port 120 is formed in the U-shaped powder suction pipe 310, the U-shaped powder suction pipe 310 is wound around the outer side of the forming cylinder body 100 where the powder suction port 120 is located, and the opening and the powder suction port 120 are connected in a one-to-one correspondence manner. In other embodiments, referring to fig. 3, the U-shaped powder suction pipe 310 may also be a concave groove, so that each powder suction port 120 is communicated with the groove cavity of the concave groove. In practical application, the U-shaped powder suction pipe 310 is connected with a powder suction machine.

By arranging the U-shaped powder suction pipeline 310, powder suction of the plurality of powder suction ports 120 can be completed by only one powder suction machine, and the cost can be saved.

Referring to fig. 5, in some embodiments, the printing platform 200 is adapted to the inner cavity of the forming cylinder body 100, and the circumferential surface of the printing platform 200 is sleeved with at least one sealing ring 210. The sealing ring 210 may be a rubber ring or other known sealing material. By arranging the sealing ring 210 on the circumferential surface of the printing platform 200, the airtightness can be improved, gas leakage can be prevented, and the airtight space enclosed by the printing platform 200 and the forming cylinder body 100 is kept in an inert atmosphere during 3D printing; but also prevents the metal powder from falling to the bottom of the forming cylinder body 100.

Referring to fig. 4, in some embodiments, the edge of the intake vent 110 near the top of the forming cylinder body 100 is inverted with a first inclined surface 111, and the first inclined surface 111 is inclined toward the bottom of the forming cylinder body 100. Through the arrangement mode, the metal powder can conveniently flow to the printing platform 200, and the metal powder is prevented from being accumulated around the air inlet 110 to influence the air inlet effect.

In a further embodiment, the edge of the powder suction port 120 near the bottom of the forming cylinder body 100 is inverted with a second inclined surface 121, and the second inclined surface 121 is inclined toward the top of the forming cylinder body 100. Through the arrangement mode, the metal powder can flow to the powder cleaning component 300 by utilizing the gravity of the metal powder, and the powder suction efficiency is further improved.

Referring to fig. 6, in a further embodiment, the air washing assembly 400 includes a blower housing 410, the blower housing 410 is disposed outside the air blowing port, the blower housing 410 is provided with an air inlet 411, and a width of a portion of the blower housing 410 near the air inlet 411 is smaller than a portion of the blower housing 410 far from the air inlet 411. The air blower housing 410 is designed in a triangular shape, the air inlet 411 is arranged at a vertex angle, and the bottom edge opposite to the vertex angle is an air outlet. Through the arrangement mode, the air outlet of the air blowing cover 410 can be uniformly blown out, the air speed of each air blowing opening is uniform, and the powder cleaning effect is improved.

The present application further provides a method of operating a forming cylinder apparatus for 3D printing, comprising the steps of:

A1. sliding the printing platform 200 to a position lower than the air purge assembly 400 (specifically, the position of the air blowing port);

A2. starting the gas washing assembly 400 to spray inert gas into the forming cylinder body 100 for gas washing;

A3. sliding the printing platform 200 to a position higher than the air cleaning assembly 400 and the powder cleaning assembly 300 (specifically, the positions of the air blowing opening and the powder sucking opening);

A4. printing a workpiece on the printing platform 200 in an inert gas environment;

A5. sliding printing platform 200 to a position lower than purge assembly 400 and purge assembly 300;

A6. starting the powder cleaning assembly 300 to preliminarily pump the metal powder in the forming cylinder body 100;

A7. starting the air washing assembly 400 again to spray air into the forming cylinder body 100, and simultaneously sucking residual metal powder by using the powder cleaning assembly 300;

A8. and taking out the workpiece.

Referring to fig. 7 to 8, the forming cylinder device for 3D printing of the present application operates as follows: when gas washing is needed, the printing platform 200 is moved to a position lower than the height of the gas washing assembly 400, the gas washing assembly 400 is opened, the powder cleaning assembly 300 is closed, inert gas is introduced into the forming cylinder body 100, and the closed space formed by the forming cylinder body 100 and the printing platform 200 is in an inert atmosphere until the oxygen content of the closed space formed by the forming cylinder body 100 and the printing platform 200 is reduced to a safety threshold; next, the air washing assembly 400 is closed, the printing platform 200 is moved to a position higher than the air washing assembly 400 and the powder cleaning assembly 300, and at this time, metal powder can be fed into the printing platform 200 to perform printing operation; after printing, metal powder needs to be cleaned, the printing platform 200 is moved to a position lower than the height of the gas washing assembly 400 and the height of the powder cleaning assembly 300 are consistent, then the powder cleaning assembly 300 is opened, metal powder on the printing platform 200 is preliminarily cleaned, and as part of metal powder still remains on the printing platform 200 after the preliminary cleaning, the gas washing assembly 400 is opened again at the moment, the remaining metal powder is blown clean, so that the powder cleaning assembly 300 can be conveniently sucked until the metal powder is completely cleaned; finally, the air washing assembly 400 and the powder cleaning assembly 300 are closed, the printing platform 200 is moved to the upper part of the forming cylinder body 100, and the formed workpiece is taken out.

From the above, according to the forming cylinder equipment for 3D printing and the operation method thereof, the air washing assembly 400 and the powder cleaning assembly 300 are arranged on the outer side of the forming cylinder body 100, so that the inside of the forming cylinder body 100 can be washed before 3D printing is performed, the inside of the forming cylinder body 100 is cleaned after the printing is completed, the forming cylinder body 100 has an integrated function of powder cleaning and air washing, and the work efficiency is improved.

In the description of the present specification, reference to the description of "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A forming cylinder device for 3D printing comprises a forming cylinder body (100) and a printing platform (200), wherein the printing platform (200) is arranged inside the forming cylinder body (100), the printing platform (200) is connected with the inner wall of the forming cylinder body (100) in a sliding and sealing mode, the forming cylinder device is characterized in that a powder cleaning assembly (300) and a gas washing assembly (400) are arranged on the outer side of the forming cylinder body (100), and the printing platform (200) can move above and below the powder cleaning assembly (300) and the gas washing assembly (400); the powder cleaning assembly (300) is used for sucking metal powder in the forming cylinder body (100), and the gas washing assembly (400) is used for spraying gas into the forming cylinder body (100).

2. The forming cylinder apparatus for 3D printing according to claim 1, characterized in that the forming cylinder body (100) is rectangular in cross section.

3. The forming cylinder apparatus for 3D printing according to claim 2, characterized in that one of the sides of the forming cylinder body (100) is provided with a plurality of air intakes (110), and the remaining three sides of the forming cylinder body (100) are provided with a plurality of powder suction ports (120); the air inlet (110) is connected with the air washing assembly (400); the powder suction port (120) is connected with the powder cleaning component (300).

4. The forming cylinder apparatus for 3D printing according to claim 3, characterized in that the plurality of air intakes (110) are evenly arranged along a straight line perpendicular to the central axis of the forming cylinder body (100); the powder suction ports (120) are uniformly distributed along a straight line perpendicular to the central axis of the forming cylinder body (100); the height position of the air inlet (110) is higher than that of the powder suction port (120).

5. The forming cylinder device for 3D printing according to claim 4, wherein the powder cleaning assembly (300) comprises a U-shaped powder suction pipe (310), an opening matched with the powder suction port (120) is formed in the U-shaped powder suction pipe (310), the U-shaped powder suction pipe (310) is wound on the outer side of the forming cylinder body (100), and the opening and the powder suction port (120) are connected in a one-to-one correspondence manner.

6. The forming cylinder apparatus for 3D printing according to claim 1, characterized in that the printing platform (200) is adapted to the inner cavity of the forming cylinder body (100), and the circumferential surface of the printing platform (200) is sleeved with at least one sealing ring (210).

7. The forming cylinder apparatus for 3D printing according to claim 4, characterized in that the rim of the air intake (110) near the top of the forming cylinder body (100) is chamfered with a first bevel (111), the first bevel (111) being inclined towards the bottom of the forming cylinder body (100).

8. The forming cylinder apparatus for 3D printing according to claim 3, characterized in that the edge of the powder suction port (120) near the bottom of the forming cylinder body (100) is chamfered with a second bevel (121), the second bevel (121) being inclined towards the top of the forming cylinder body (100).

9. Moulding cylinder apparatus for 3D printing according to claim 3, characterized in that the washing air assembly (400) comprises a blower housing (410), which blower housing (410) is arranged outside the air blowing opening, which blower housing (410) is provided with an air inlet opening (411), the width of the part of the blower housing (410) near the air inlet opening (411) being smaller than the part of the blower housing (410) remote from the air inlet opening (411).

10. A method of operating a forming cylinder apparatus for 3D printing, applied to a forming cylinder apparatus for 3D printing according to any one of claims 1-9, comprising the steps of:

A1. sliding the printing platform (200) to a position below the air purge assembly (400);

A2. starting the gas washing assembly (400) to spray inert gas into the forming cylinder body (100) for washing gas;

A3. sliding the printing platform (200) to a position higher than the purge assembly (400) and the toner assembly (300);

A4. printing a workpiece on the printing platform (200) in an inert gas environment;

A5. sliding the printing platform (200) to a position lower than the purge assembly (400) and the toner assembly (300);

A6. starting the powder cleaning assembly (300) to perform primary suction on the metal powder in the forming cylinder body (100);

A7. the air washing assembly (400) is started again to spray air into the forming cylinder body (100), and meanwhile, the powder cleaning assembly (300) is used for sucking residual metal powder;

A8. and taking out the workpiece.