CN114682806B

CN114682806B - Laser powder bed melting forming device based on rotary powder spreading machine

Info

Publication number: CN114682806B
Application number: CN202210277363.4A
Authority: CN
Inventors: 马成龙; 武美萍; 彭鑫; 王全龙; 缪小进
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2023-05-05
Anticipated expiration: 2042-03-14
Also published as: CN114682806A

Abstract

The invention discloses a laser powder bed melting forming device based on a rotary powder spreading mechanism, which comprises a forming assembly, wherein the forming assembly comprises a cylindrical main body, a forming groove and a powder groove are arranged at the upper end of the cylindrical main body, the forming groove and the powder groove are symmetrically arranged, a first piston is arranged in the forming groove, a second piston is arranged in the powder groove, and a partition plate is formed between the forming groove and the powder groove; the powder spreading component comprises a scraping plate arranged on the partition plate; the invention adopts a circumferential rotation powder spreading mode of matching a powder spreading mechanism directly driven by a driving motor and a quasi-cylindrical working cylinder body, thereby greatly reducing powder spreading time and improving forming efficiency while ensuring uniform powder deposition. In addition, the powder paving device is internally integrated with the air inlet and air blowing functions, and an air blowing port array on the powder paving device can always face to the arcuately distributed diversion smoke exhaust device after the powder paving device finishes powder paving work in the forming process, so that a high-efficiency stable air flow passage is formed, and the effective removal of smoke dust in the printing process is ensured.

Description

Laser powder bed melting forming device based on rotary powder spreading machine

Technical Field

The invention relates to the technical field of 3D printing, in particular to a laser powder bed melting forming device based on a rotary powder spreading mechanism.

Background

Additive Manufacturing (AM) technology, i.e. 3D printing technology, is intended to achieve precision forming of three-dimensional components by mesoscale layup manufacturing, unlike the subtractive ideas of conventional manufacturing technology. The american society for testing and materials defines additive manufacturing as "a material bonding process that converts 3D model data into three-dimensional entities by lamination as opposed to subtractive manufacturing, also known as additive processing, additive technology, additive manufacturing, layered manufacturing, and freemanufacturing. Additive manufacturing technology has been born for only 30 years since the last 80 th century, but has been developed very rapidly, especially in the last decade, and has become one of the leading edges and hot spots in the current mechanical engineering field. Metals or alloys are the most widely used structural materials in practical engineering, making metal additive manufacturing technology a unique and important place in the 3D printing field. Metal additive manufacturing techniques can be classified into powder systems and wire systems according to the original material morphology, and compared with the latter, metal additive manufacturing costs based on powder systems are relatively high, but the forming accuracy is also significantly higher. The laser powder bed melting technology (Laser powder bed fusion, LPBF) based on the powder bed is mainly characterized by a fine powder layer thickness and an extremely fine beam spot size (the powder layer thickness can reach 20 mu m, and the beam spot size is less than 100 mu m), so that the laser powder bed melting technology is suitable for small-batch precise forming of complex metal components, particularly for direct rapid forming manufacturing of complex structure prototype parts, special-shaped parts, tools and moulds in the aerospace field, and has definite application requirements and development prospects.

The LPBF forming system mainly comprises a laser, an optical path system, a scanning galvanometer, a forming cavity, a powder paving system, a circulating gas path purifying system, a computer control system and the like. When forming a sample based on the LPBF, firstly, a three-dimensional model is required to be imported into processing software to carry out a series of model processing before processing, wherein the model position placement, support addition, processing parameter setting and the like are included, and then all the three-dimensional models to be printed are scattered into two-dimensional digital tracks through a software slicing function and form data packets to be imported into an LPBF forming system; then preparing the forming cavity before processing, wherein the steps comprise leveling and fixing the forming substrate, filling powder, sealing the cavity, starting a vacuum pump and protective gas, and the like, wherein the oxygen content in the forming cavity is reduced to a certain value (such as below 200 ppm), and the laser can be started to execute a printing task. In the LPBF forming process, a powder spreading arm or roller uniformly deposits powder with a certain layer thickness on a substrate, and then a laser beam selectively melts local powder to form a two-dimensional plane under the control of a computer according to slicing information; and after one layer is processed, the forming cylinder descends, the powder cylinder ascends, and the laser beam continues to repeat the process until the final three-dimensional entity is formed based on the next layer slice information.

However, the round trip travel of the powder spreading arm or roller in each layer forming period obviously reduces the forming efficiency of the component, and in order to improve the forming efficiency, the traveling speed of the powder spreading arm or roller is generally improved, however, the too fast traveling speed tends to cause dust raising, and meanwhile, the formation of uneven deposited powder layers is also easy to cause. In addition, in the traditional LPBF forming system, due to the straight design of the air outlet guide plate, the movement path of smoke dust is longer, and the smoke dust is not easy to be discharged in time during the far-end forming; on the other hand, for the observation window, which is generally perpendicular to the airflow motion path, this design is really unfavorable for the engineering/researchers to directly observe the interaction between the airflow and the splashes and the smoke.

Disclosure of Invention

This section is intended to summarize some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, which may be simplified or omitted from the present section and description abstract and title of the application to avoid obscuring the objects of this section, description abstract and title, and which is not intended to limit the scope of this invention.

The present invention has been made in view of the above and/or problems occurring in the prior art.

Therefore, the technical problem to be solved by the invention is to provide the laser powder bed melting forming device based on the rotary powder spreading mechanism, so that the defects of the prior art are overcome, and the forming efficiency and the forming quality can be remarkably improved when the device is used for forming a complicated customized component.

In order to solve the technical problems, the invention provides the following technical scheme: the laser powder bed melting forming device based on the rotary powder spreading mechanism comprises a forming assembly, wherein the forming assembly comprises a cylindrical main body, a forming groove and a powder groove are formed in the upper end of the cylindrical main body, the forming groove and the powder groove are symmetrically arranged, a first piston is arranged in the forming groove, a second piston is arranged in the powder groove, and a partition plate is formed between the forming groove and the powder groove;

the powder spreading assembly comprises a scraping plate arranged on the partition plate.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the cylindrical main body is internally provided with a first driving piece and a second driving piece, the first driving piece is provided with a first piston rod, and the second driving piece is provided with a second piston rod; the first piston rod stretches into the forming groove to be connected with the first piston, and the second piston rod stretches into the powder groove to be connected with the second piston.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the inside third driving piece that still is provided with of cylindricality main part, the baffle center is provided with the shaft hole, third driving piece is provided with the drive shaft, the drive shaft pass the shaft hole with the scraper blade is connected.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the scraper is hollow, one side of the scraper is connected with the scraper, a plurality of air blowing ports are formed in one side surface of the scraper opposite to the scraper, and an air inlet is formed in one end surface of the air blowing port, which is far away from the cylindrical main body.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the scraper blade is inside to be provided with the baffle along length direction, form the clearance between the below of baffle and the scraper blade bottom surface.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the device comprises a cylindrical main body, a working table plate, a forming cavity and a connecting plate, wherein the working table plate is provided with a circular hole, the circular hole is matched with the cylindrical main body in size and is connected to the end face of the cylindrical main body, an accommodating column body coaxial with the cylindrical main body is arranged above the working table plate, the forming cavity is arranged in the accommodating column body, and the opening at the lower end of the forming cavity is connected with the working table plate; an observation port is formed in one side of the forming cavity.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: an air outlet is formed in one side, far away from the powder groove, of the accommodating cylinder; the forming cavity is internally provided with a semi-annular plate, the air outlet is positioned between the semi-annular plate and the working table plate, a plurality of guide plates are uniformly arranged between the semi-annular plate and the working table plate, and one end, away from the powder groove, of each guide plate is inclined towards the air outlet.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the part of the baffle plate, which is positioned at one side of the shaft hole, is provided with a powder leakage groove, and a collecting tank is arranged in the powder leakage groove.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the first piston is provided with a forming substrate, and the second piston is provided with a powder substrate.

As a preferable scheme of the laser powder bed fusion forming device based on the rotary powder spreading mechanism, the invention comprises the following steps: the laser forming machine comprises a forming groove, and is characterized by further comprising a frame, wherein the frame is a rectangular frame, the working table plate is fixedly arranged inside the frame, a mounting hole is formed in one side of the forming groove in the accommodating cylinder, an optical path system is arranged above the mounting hole, and the optical path system is connected with a laser generator.

The invention has the beneficial effects that: the traditional linear reciprocating powder paving mode is abandoned, and the powder paving mechanism directly driven by the driving motor and the circumferential rotation powder paving mode matched with the quasi-cylindrical working cylinder body are adopted, so that the powder paving time is greatly reduced and the forming efficiency is improved while the uniform powder deposition is ensured. In addition, the powder paving device is internally integrated with the air inlet and air blowing functions, and an air blowing port array on the powder paving device can always face to the arcuately distributed diversion smoke exhaust device after the powder paving device finishes powder paving work in the forming process, so that a high-efficiency stable air flow passage is formed, and the effective removal of smoke dust in the printing process is ensured. The innovation of the powder spreading mode and the multifunctional integration of the powder spreading device effectively solve the structural redundancy problem existing in the traditional forming device, save the space of a forming cavity, and simultaneously have very definite response to the requirements of low cost, high speed and precise forming of small-size complex customized components.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a schematic structural diagram of a cylindrical main body in a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a cylindrical main body in a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an internal structure of a cylindrical main body in a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a molding assembly and a powder spreading assembly in a laser powder bed fusion molding device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a powder spreading assembly in a laser powder bed melt forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a powder spreading assembly in a laser powder bed melt forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional structure of a semi-annular plate and a baffle in a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the overall structure of a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention;

fig. 10 is a schematic diagram of the structure principle and use of a laser powder bed fusion forming device based on a rotary powder spreading mechanism according to an embodiment of the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

In the following detailed description of the embodiments of the present invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration only, and in which is shown by way of illustration only, and in which the scope of the invention is not limited for ease of illustration. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.

Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a laser powder bed fusion forming apparatus based on a rotary powder spreading mechanism, comprising a forming assembly 100 and a powder spreading assembly 200; the molding assembly 100 comprises a cylindrical main body 101, wherein the cylindrical main body 101 is cylindrical, a molding groove 101a and a powder groove 101b are formed in the upper end of the cylindrical main body, the molding groove 101a and the powder groove 101b are symmetrically arranged, two surfaces of the molding groove 101a and the powder groove 101b are parallel, the radiuses of the two cambered surfaces are consistent, a first piston 102 is arranged in the molding groove 101a, a second piston 103 is arranged in the powder groove 101b, the first piston 102 can axially move in the molding groove 101a, the second piston 103 can axially move in the second piston 103, and a partition plate 101c is formed between the molding groove 101a and the powder groove 101 b; the partition plate 101c is arranged on the radial direction of the cylindrical main body 101, and two side surfaces of the partition plate 101c are the side surfaces of the forming groove 101a and the powder groove 101 b; the powder spreading assembly 200 includes a scraper 201 disposed on the partition 101 c. Wherein the length of the wiper 201 corresponds to the diameter of the cylindrical body 101.

Further, a first driving piece 104 and a second driving piece 105 are arranged in the cylindrical main body 101, the first driving piece 104 and the second driving piece 105 are hydraulic cylinders and can output linear motion, the first driving piece 104 is provided with a first piston rod 104a, and the second driving piece 105 is provided with a second piston rod 105a; the first piston rod 104a extends into the molding groove 101a to be connected with the first piston 102, and the second piston rod 105a extends into the powder groove 101b to be connected with the second piston 103. The heights of the first and

second pistons

102, 103 are thus controlled by the first and

second drivers

104, 105.

Further, a third driving member 106 is further disposed inside the cylindrical main body 101, the third driving member 106 is a motor, a shaft hole 101d is disposed in the center of the partition 101c, a driving shaft 106a is disposed in the third driving member 106, and the driving shaft 106a passes through the shaft hole 101d and is connected with the scraper 201. The squeegee 201 is thus driven to rotate by the motor; the scraper 201 is hollow, one side of the scraper 201 is connected with a scraper 202, one side of the scraper 202 is fixedly arranged on the scraper 201, and one side of the cutting edge of the scraper 202 is perpendicular to the upper surface of the cylindrical main body 101. A plurality of air blowing ports 201a are provided on a side surface of the scraper 201 opposite to the scraper 202, and an air inlet 201b is provided on an end surface of the air blowing port 201a remote from the columnar body 101. The air inlet 201b is connected with an air pump, and is inflated by the air pump and sprayed out by the air blowing openings 201a, in this embodiment, the air blowing openings 201a are arranged in 4 rows and uniformly distributed, and two adjacent rows of air blowing openings 201a are distributed in a staggered manner.

In this embodiment, the powder spreading assembly 200 performs a circumferential rotation around the geometric center symmetry axis of the cylindrical body 101 by means of the third driving member 106, so as to achieve a uniform spreading of the powder in the semicircular forming area.

Example 2

Referring to fig. 1 to 10, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that:

in this embodiment, a baffle 203 is provided inside the scraper 201 in the longitudinal direction, and a gap is formed between the lower side of the baffle 203 and the bottom surface of the scraper 201. Directing gas to enter from below the baffle and then blow out from the array of blow ports 201 a; without the baffle, most of the gas may be blown out directly from the upper rows of blow openings 201a, and the lower blow openings 201a have a smaller blowing amount, and cannot blow off smoke dust generated in the laser forming process well.

Further, the device further comprises a workbench plate 204, wherein a circular hole is formed in the workbench plate 204, the circular hole is matched with the cylindrical main body 101 in size, and the circular hole is connected to the end face of the cylindrical main body 101 in a welding mode.

A containing column 205 coaxial with the cylindrical main body 101 is arranged above the working table 204, a forming cavity 205a is arranged in the containing column 205, and the lower end opening of the forming cavity 205a is connected with the working table 204; an observation port 205d is formed in one side of the molding cavity 205 a. The viewing port 205d is an arc-shaped operation window and is provided with a window mirror.

The side of the accommodating column 205 away from the powder tank 101b is provided with an air outlet 205b; accordingly, the air inlet 201b is provided at the upper end of the rotation center of the scraper 201, and is blown out into the air outlet through the inner baffle 203 to form an air flow passage.

A semi-annular plate 206 is arranged in the forming cavity 205a, the air outlet 205b is positioned between the semi-annular plate 206 and the working table 204 to form a ring pipe shape, a plurality of guide plates 207 are uniformly arranged between the semi-annular plate 206 and the working table 204, and one end of each guide plate 207, which is far away from the powder groove 101b, is inclined towards the air outlet 205 b. The plurality of guide plates 207 are integrally distributed along the circular arc inside the forming cavity 205a, so that the guide direction of any two adjacent guide plates 207 is deviated to the air outlet 205b and is enclosed outside the forming groove 101a, and the generated smoke dust can be better and more widely collected and guided, thereby being beneficial to improving the forming quality.

The baffle 207 functions to guide the fume or powder inside to be discharged from the air outlet 205 b.

Further, a powder leakage groove 101e is provided in a portion of the partition plate 101c located on the shaft hole 101d side, and a collection tank 107 is provided inside the powder leakage groove 101 e.

The first piston 102 is provided with a molding substrate 102a, and the second piston 103 is provided with a frit substrate 103a.

In this embodiment, the machine frame 300 is a rectangular frame, the machine frame is formed by welding a plurality of sections, and the working table 204 is fixedly arranged in the machine frame 300 and is connected by welding; the accommodating cylinder 205 has a mounting hole 205c provided on the molding groove 101a side, and an optical path system 400 is provided above the mounting hole 205c, and the optical path system 400 is connected to the laser generator 500.

The optical path system 400 is a laser scanning galvanometer system, that is, a laser scanning galvanometer system in the prior art, and further includes a display operation system disposed on the frame, where the laser scanning galvanometer system, the display operation system, and the laser generator are all devices of a laser powder bed melting technology (Laser powder bed fusion, LPBF) in the prior art.

It should be noted that, the laser irradiation range guided out by the optical path system 400 can meet the requirement of the forming area of the forming groove 101a, and meanwhile, the laser focus just falls on the upper surfaces of the forming groove 101a and the forming substrate 102a, the laser generator is fixed at the middle lower end position of the frame, and the display operation system is connected to the middle external position of the right side of the frame through a hinge.

The structural principles and steps of the present invention will be further described with reference to the accompanying drawings:

in the forming process, the second piston 103 in the powder tank 101b rises for a certain layer thickness, the first piston 102 in the forming tank 101a descends for a layer thickness, then the powder spreading component 200 rotates anticlockwise around the central axis of the cylinder body of the cylindrical main body under the drive of the motor of the third driving piece 106, in the process, the powder in the powder tank 101b is continuously pushed by the scraper 202 to the powder spreading movement direction along the circumferential direction until the scraper 201 rotates for one circle (360 degrees), the powder is uniformly deposited in the forming tank 101a, the redundant supplied powder enters the powder leakage tank 101e along with the rotation of the scraper 201, then the laser works to print samples, the powder spreading device keeps the initial position stationary until the layer is processed, meanwhile, inert gas passing through the air inlet at the upper end of the scraper 202 is blown out through the partition plate and the air blowing port array, and smoke dust generated by the laser-powder action is quickly brought into the air outlet through the semi-ring plate 206 and the air guide plate 207 on the inner side of the accommodating cylinder 205. The whole process forms a period, and the period is continuously circulated until the sample is formed.

It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. Laser powder bed melts forming device based on rotatory shop's powder mechanism, its characterized in that: comprising the steps of (a) a step of,

the molding assembly (100) comprises a cylindrical main body (101), wherein a molding groove (101 a) and a powder groove (101 b) are formed in the upper end of the cylindrical main body, the molding groove (101 a) and the powder groove (101 b) are symmetrically arranged, a first piston (102) is arranged in the molding groove (101 a), a second piston (103) is arranged in the powder groove (101 b), and a partition plate (101 c) is formed between the molding groove (101 a) and the powder groove (101 b);

a powder spreading assembly (200) comprising a scraper (201) arranged on the partition board (101 c);

the scraper (201) is hollow, one side of the scraper (201) is connected with a scraper (202), one side surface of the scraper (201) opposite to the scraper (202) is provided with a plurality of air blowing openings (201 a), and one end surface of the air blowing openings (201 a) far away from the cylindrical main body (101) is provided with an air inlet (201 b);

the automatic forming machine comprises a cylindrical main body (101), and is characterized by further comprising a working table plate (204), wherein a circular hole is formed in the working table plate (204), the circular hole is matched with the cylindrical main body (101) in size and is connected to the end face of the cylindrical main body (101), a containing column body (205) coaxial with the cylindrical main body (101) is arranged above the working table plate (204), a forming cavity (205 a) is formed in the containing column body (205), and the lower end opening of the forming cavity (205 a) is connected with the working table plate (204); an observation port (205 d) is formed on one side of the forming cavity (205 a);

an air outlet (205 b) is formed in one side, far away from the powder groove (101 b), of the accommodating cylinder (205); a semi-annular plate (206) is arranged in the forming cavity (205 a), the air outlet (205 b) is positioned between the semi-annular plate (206) and the working table plate (204), a plurality of guide plates (207) are uniformly arranged between the semi-annular plate (206) and the working table plate (204), and one end, far away from the powder groove (101 b), of each guide plate (207) is inclined towards the air outlet (205 b);

the powder leakage groove (101 e) is formed in the part, located at one side of the shaft hole (101 d), of the partition plate (101 c), and the collecting tank (107) is arranged inside the powder leakage groove (101 e).

2. The laser powder bed fusion forming device based on a rotary powder spreading mechanism according to claim 1, wherein: a first driving piece (104) and a second driving piece (105) are arranged in the cylindrical main body (101), the first driving piece (104) is provided with a first piston rod (104 a), and the second driving piece (105) is provided with a second piston rod (105 a); the first piston rod (104 a) stretches into the forming groove (101 a) to be connected with the first piston (102), and the second piston rod (105 a) stretches into the powder groove (101 b) to be connected with the second piston (103).

3. The laser powder bed fusion forming device based on the rotary powder spreading mechanism according to claim 2, wherein: the novel scraper blade is characterized in that a third driving piece (106) is further arranged inside the cylindrical main body (101), a shaft hole (101 d) is formed in the center of the partition plate (101 c), a driving shaft (106 a) is arranged on the third driving piece (106), and the driving shaft (106 a) penetrates through the shaft hole (101 d) to be connected with the scraper blade (201).

4. A laser powder bed fusion forming device based on a rotary powder spreading mechanism according to claim 3, wherein: a baffle plate (203) is arranged in the scraper (201) along the length direction, and a gap is formed between the lower part of the baffle plate (203) and the bottom surface of the scraper (201).

5. The laser powder bed fusion forming device based on the rotary powder spreading mechanism according to claim 4, wherein: a forming substrate (102 a) is arranged on the first piston (102), and a powder substrate (103 a) is arranged on the second piston (103).

6. The laser powder bed fusion forming device based on the rotary powder spreading mechanism according to claim 5, wherein: still include frame (300), frame (300) are rectangular frame, work platen (204) are fixed to be set up in frame (300) inside, hold cylinder (205) and be provided with mounting hole (205 c) in shaping groove (101 a) one side, mounting hole (205 c) top is provided with light path system (400), light path system (400) are connected with laser generator (500).