Scraper assembly, powder spreading device and additive manufacturing apparatus

Abstract

The application relates to the field of additive manufacturing technology and aims to solve the problem of how to make a scraper assembly more convenient to level, and provides a scraper assembly, a powder spreading device and additive manufacturing equipment. The scraper assembly comprises a scraper fixing seat and a scraper, the scraper comprises a fixed part and a powder scraping part distributed along a first direction, the scraper is provided with a powder channel, the powder channel penetrates through the fixed part and the powder scraping part along the first direction respectively, and a powder outlet is formed on the side of the powder scraping part away from the fixed part; the fixed part is installed on the scraper fixing seat, and the side of the powder scraping part away from the fixed part protrudes from the scraper fixing seat along the first direction; the powder scraping part comprises two blade parts, the two blade parts are arranged at intervals along a second direction to define the powder channel between the two blade parts; and the scraper is integrally formed. The first direction is perpendicular to the second direction. The application has the beneficial effect of making the leveling of the scraper easier.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to a scraper assembly, a powder spreading device and an additive manufacturing equipment. BACKGROUND

[0002] A scraper assembly is provided in the related art, which includes two blades, and the two blades are arranged in a powder spreading direction to achieve bidirectional powder spreading. However, the scraper assembly needs to be leveled before powder spreading, and the scraper assembly in the related art is not convenient to level. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a scraper assembly, a powder spreading device and an additive manufacturing equipment to solve the problem of how to make the scraper assembly more convenient to level.

[0004] According to an aspect of the present application, a scraper assembly is provided, which includes a scraper fixing seat and a scraper. The scraper includes a fixed part and a powder scraping part distributed along a first direction. The scraper is provided with a powder channel, and the powder channel penetrates through the fixed part and the powder scraping part along the first direction and forms a powder outlet on the side of the powder scraping part away from the fixed part. The fixed part is installed on the scraper fixing seat, and the side of the powder scraping part away from the fixed part protrudes from the scraper fixing seat along the first direction. The powder scraping part includes two blade parts, and the two blade parts are arranged in a second direction to define a powder channel between the two blade parts. The scraper is integrally formed. The first direction is perpendicular to the second direction.

[0005] The above-mentioned scraper assembly can better ensure that the blade surfaces of the two blade parts are located in the same plane because the scraper is integrally formed. For example, the two blade surfaces can be produced in the same plane, so that the two blade parts do not need to be leveled separately, and thus the leveling of the scraper is easier.

[0006] In one of the embodiments, the powder scraping part further includes two closed parts. The closed parts are connected between the two blade parts, and the two closed parts are respectively located at two ends of the blade part along a third direction. The two blade parts and the two closed parts enclose the powder outlet and one end of the powder channel connected to the powder outlet. The third direction is perpendicular to the first direction and the second direction.

[0007] In one of the embodiments, the end of the blade part away from the fixed part has a blade surface. The end of the closed part away from the fixed part has an end surface. The blade surface is coplanar with the end surface.

[0008] In one of the embodiments, the scraper further includes a plurality of supporting parts. The supporting parts are connected between the cavity walls on both sides of the powder channel along the second direction, and the plurality of supporting parts are arranged in the third direction and spaced apart from each other. The third direction is perpendicular to the first direction and the second direction.

[0009] In one of the embodiments, the support portion is spaced apart from the powder outlet along the first direction.

[0010] In one of the embodiments, the scraper fixing base is provided with a stepped hole, the stepped hole includes a first stepped hole and a second stepped hole distributed along the first direction, the second stepped hole is communicated with the first stepped hole at a side close to the powder outlet, and the size of the second stepped hole along the second direction is smaller than the size of the first stepped hole along the second direction. The fixing portion is arranged in the first stepped hole, the powder scraping portion is arranged in the second stepped hole, and a side of the powder scraping portion away from the fixing portion protrudes out of the second stepped hole. The fixing portion protrudes out of the two blade portions along the second direction respectively, and can abut against the stepped surface of the first stepped hole. The scraper assembly further includes a scraper fixing member connected with the scraper fixing base and limiting the fixing portion along the first direction between the scraper fixing member and the stepped surface. The scraper fixing member is provided with a powder inlet cavity penetrating through the scraper fixing member along the first direction, and an end of the powder inlet cavity close to the scraper fixing base is communicated with an end of the powder channel away from the powder outlet.

[0011] In one of the embodiments, an end of the first stepped hole away from the second stepped hole penetrates through the scraper fixing base and forms an opening. The fixing portion is arranged at a lower part of the first stepped hole close to the second stepped hole along the first direction. The scraper fixing member includes a pressing plate and a connecting plate. The connecting plate is arranged on a side of the scraper fixing base provided with the opening and connected with the scraper fixing base. The pressing plate is connected with the connecting plate, penetrates through an upper part of the first stepped hole away from the second stepped hole, and abuts against the fixing portion along the first direction. The powder inlet cavity penetrates through the pressing plate and the connecting plate respectively.

[0012] In one of the embodiments, a side of the powder inlet cavity away from the powder channel forms a powder inlet, and the size of the powder inlet along the second direction is greater than the size of an end of the powder inlet cavity communicated with the powder channel along the second direction.

[0013] According to another aspect of the present application, a powder spreading device is provided, which includes the scraper assembly according to any one of the above embodiments, a powder spreading platform, and a driving mechanism. The powder spreading platform is arranged opposite to the powder outlet along the first direction, and the driving mechanism is drivingly connected with the scraper assembly to drive the scraper assembly to reciprocate relative to the powder spreading platform along the second direction.

[0014] According to still another aspect of the present application, an additive manufacturing equipment is provided, which includes the powder spreading device according to the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation on the scope. Other related drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 A cross-sectional view of an additive manufacturing apparatus in an embodiment of the present application.

[0017] Figure 2 A partial structural cross-sectional view of a powder spreading device in an embodiment of the present application (a powder adding device is additionally shown in the figure).

[0018] Figure 3 A partial cross-sectional view of a powder spreading device in an embodiment of the present application. Figure 1 A partial enlarged view of A in the embodiment shown.

[0019] Figure 4 A perspective view of a doctor blade assembly in an embodiment of the present application. Figure 1 An exploded view of a doctor blade assembly in an embodiment of the present application.

[0020] Figure 5 A perspective view of a doctor blade in an embodiment of the present application. Figure 4 An exploded view of a doctor blade in an embodiment of the present application.

[0021] Figure 6 A perspective view of a doctor blade in an embodiment of the present application. Figure 1 A cross-sectional view of a doctor blade in an embodiment of the present application.

[0022] Figure 7 A perspective view of a doctor blade in an embodiment of the present application. Figure 6 A cross-sectional view of a doctor blade in an embodiment of the present application.

[0023] Figure 8 A perspective view of a doctor blade in an embodiment of the present application. Figure 6 A perspective view of a doctor blade in an embodiment of the present application.

[0024] Explanation of main element symbols:

[0025] Additive manufacturing apparatus 1000

[0026] Powder spreading device 100

[0027] Doctor blade assembly 1

[0028] Doctor blade fixing seat 10

[0029] Step hole 10a

[0030] First step hole 10a1

[0031] Second step hole 10a2

[0032] Open 10b

[0033] Doctor blade 20

[0034] Powder passage 20a

[0035] Powder outlet 20b

[0036] Fixed part 21

[0037] Powder scraping part 22

[0038] blade part 221

[0039] blade surface 2211

[0040] closure part 222

[0041] end surface 2221

[0042] support part 23

[0043] scraper fixing member 30

[0044] powder inlet 30b

[0045] powder inlet 30b

[0046] pressing plate 31

[0047] connecting plate 32

[0048] powder laying platform 2

[0049] molding cylinder 200

[0050] piston plate 300

[0051] lifting mechanism 400

[0052] powder adding device 500

[0053] first direction Z

[0054] second direction X

[0055] third direction Y

[0056] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0058] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0060] Some embodiments of the present application are described in detail. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0061] Embodiments

[0062] Figure 1 A cross-sectional view of an additive manufacturing device 1000 according to an embodiment of the present application; Figure 2 A partial structure cross-sectional view of a powder spreading device 100 according to an embodiment of the present application (a powder adding device 500 is additionally shown in the figure); Figure 3 A cross-sectional view of a powder spreading device 100 according to an embodiment of the present application; Figure 1 An enlarged view of a portion A shown in the embodiment.

[0063] Referring to Figure 1 and Figure 2 , the embodiment provides an additive manufacturing device 1000 including a powder spreading device 100. The powder spreading device 100 includes a powder spreading platform 2, and the powder spreading device 100 is configured to uniformly spread a powder material on the powder spreading platform 2 before starting printing of each layer to form a powder layer with accurate thickness, thereby providing a complete processing surface for subsequent laser / electron beam melting or sintering.

[0064] In some embodiments, as shown in Figure 1 , the additive manufacturing device 1000 further includes a forming cylinder 200, a piston plate 300 and a lifting mechanism 400. The forming cylinder 200 is installed on the powder spreading platform 2, the piston plate 300 is slidingly connected to the inner side of the forming cylinder 200, and the lifting mechanism 400 is connected to the bottom of the piston plate 300.

[0065] Referring to Figure 2 , the powder spreading device 100 provided by the embodiment includes a scraper assembly 1, a powder spreading platform 2 and a driving mechanism (not shown). In combination with Figure 3 , the scraper assembly 1 is provided with a powder outlet 20b, and the powder spreading platform 2 is oppositely arranged with the powder outlet 20b along a first direction Z. The driving mechanism is drivingly connected to the scraper assembly 1 to drive the scraper assembly 1 to reciprocally move along a second direction X relative to the powder spreading platform 2.

[0066] In this way, when spreading the powder, the driving mechanism drives the scraper assembly 1 to translate along the surface of the powder spreading platform 2 along the second direction X, so as to realize powder spreading through the relative movement between the powder outlet 20b and the powder spreading platform 2.

[0067] In some embodiments, as shown in Figure 2 The additive manufacturing device 1000 further comprises a powder feeding device 500 for feeding powder material to the scraper assembly 1. In use, the driving mechanism drives the scraper assembly 1 to move to the position of the powder feeding device 500 to receive powder, and then drives the scraper assembly 1 to perform powder spreading once, and then waits for the printing to be completed. After the printing is completed, the driving mechanism drives the scraper assembly 1 to move to the position of the powder feeding device 500 to receive powder, and then the above-mentioned actions are repeated. It should be noted that, Figure 2 The powder spreading platform 2 and the powder feeding device 500 in the above-mentioned embodiments are only used to show the relative positions of the parts, and do not represent the actual structures of the powder spreading platform 2 and the powder feeding device 500.

[0068] Figure 4 The perspective view of the scraper assembly 1 in the embodiment shown in Figure 1 The perspective view of the scraper assembly 1 in the embodiment shown in Figure 5 The exploded view of the scraper assembly 1 in the embodiment shown in Figure 4 The perspective view of the scraper 20 in the embodiment shown in Figure 6 The perspective view of the scraper 20 in the embodiment shown in Figure 1 The perspective view of the scraper 20 in the embodiment shown in Figure 7 The perspective view of the scraper 20 in the embodiment shown in Figure 6 The perspective view of the scraper 20 in the embodiment shown in

[0069] Referring to Figure 4 to Figure 6 The scraper assembly 1 provided in the embodiment comprises a scraper fixing seat 10 and a scraper 20. The scraper 20 comprises a fixed part 21 and a powder scraping part 22 distributed along a first direction Z, and the fixed part 21 is combined with the scraper fixing seat 10. Figure 7 As shown in Figure 3 The fixed part 21 is installed on the scraper fixing seat 10, and the side of the powder scraping part 22 away from the fixed part 21 protrudes from the scraper fixing seat 10 along the first direction Z. The powder scraping part 22 comprises two blade parts 221, and the two blade parts 221 are arranged at intervals along a second direction X to define a powder passage 20a between the two blade parts 221, and the scraper 20 is integrally formed. The first direction Z is perpendicular to the second direction X.

[0070] In the aforementioned doctor blade assembly 1, the powder channel 20a within the doctor blade 20 stores powder material. During powder spreading, the powder material falls from the powder channel 20a through the powder outlet 20b onto the powder spreading platform 2. The doctor blade assembly 1 moves relative to the powder spreading platform 2, causing the doctor blade 22 to spread the powder material evenly onto the platform 2. By including two blade sections 221 in the doctor blade 22, the doctor blade assembly 1 can perform bidirectional powder spreading. After receiving powder, the doctor blade assembly 1 moves along the second direction X toward the powder spreading platform 2 away from the powder feeding device 500 to perform one powder spreading operation. Then, after printing is complete, the doctor blade assembly 1 moves again along the second direction X toward the side closer to the powder feeding device 500 to receive powder again, simultaneously performing another powder spreading operation. This allows for two powder spreading operations with a single powder receiving operation, improving powder spreading efficiency and consequently, printing efficiency. Furthermore, because the scraper 20 is integrally molded, it is easier to manufacture, reduces costs, and facilitates installation. It eliminates the need to separately install the two blade sections 221 onto the scraper holder 10, and better ensures that the cutting surfaces 2211 of the two blade sections 221 are on the same plane. The cutting surface 2211 is the end face of the blade section 221 furthest from the holder 21. For example, the two cutting surfaces 2211 can be manufactured on the same plane, eliminating the need for separate leveling of the two blade sections 221. This makes leveling the scraper 20 easier, resulting in more consistent force on the two blade sections 221, thus improving powder spreading and printing quality.

[0071] It should be noted that leveling the blade 221 refers to adjusting the relative position of the blade surface 2211 and the powder spreading platform 2 in three-dimensional space, so that the parallelism error between the blade surface 2211 and the powder spreading platform 2 in the plane perpendicular to the first direction Z is less than a preset error value, and the gap between the blade surface 2211 and the powder spreading platform 2 in the first direction Z is equal to the target layer thickness, so as to improve the powder spreading accuracy.

[0072] By defining a powder channel 20a between the two blade portions 221, it is beneficial to reduce the size of the powder channel 20a along the second direction X, thereby reducing the volume of powder material between the two blade portions 221. This avoids excessive powder material compression on the blade portions 221 during powder spreading, preventing excessive force on the blade portions 221 and causing uneven powder spreading or ripples and other poor powder spreading problems. In use, the first direction Z can be the direction of gravity.

[0073] Figure 8 for Figure 6 A perspective view of the scraper 20 in the illustrated embodiment from another angle.

[0074] In some embodiments, such as Figure 6 and Figure 8As shown, the powder scraping section 22 also includes two sealing sections 222. The sealing sections 222 are connected between the two blade sections 221, and the two sealing sections 222 are located at opposite ends of the blade sections 221 along the third direction Y. The two blade sections 221 and the two sealing sections 222 enclose the powder outlet 20b (see...). Figure 7 The powder channel 20a is connected to one end of the powder outlet 20b. The third direction Y is perpendicular to the first direction Z and the second direction X. Thus, by providing the sealing part 222 to seal both ends of the powder outlet 20b along the third direction Y, powder material is prevented from overflowing from both ends of the scraper 20, improving powder spreading accuracy and reducing material waste.

[0075] In some embodiments, such as Figure 8 As shown, the blade portion 221 has a blade surface 2211 at the end away from the fixing portion 21, and the closing portion 222 has an end face 2221 at the end away from the fixing portion 21. The blade surface 2211 and the end face 2221 are coplanar to better prevent powder material from overflowing.

[0076] In some embodiments, such as Figure 7 and Figure 8 As shown, the scraper 20 also includes multiple support portions 23, which are connected between the cavity walls on both sides of the powder channel 20a along the second direction X. The multiple support portions 23 are spaced apart from each other along the third direction Y. Thus, by providing the support portions 23, support is provided to the cavity walls on both sides of the powder channel 20a along the second direction X, reducing deformation of the scraper 20. For example, when the scraper 20 is made of a softer material and its length along the third direction Y is relatively long, the multiple support portions 23 prevent deformation of the middle portion of the scraper 20 along the third direction Y during powder spreading, thus avoiding narrowing or closure of the powder channel 20a.

[0077] In some embodiments, such as Figure 7 As shown, the support part 23 is spaced apart from the powder outlet 20b along the first direction Z to avoid the support part 23 affecting the powder spreading accuracy.

[0078] In some embodiments, such as Figure 3As shown, the scraper holder 10 is provided with stepped holes 10a. The stepped holes 10a include a first stepped hole 10a1 and a second stepped hole 10a2 distributed along the first direction Z. The second stepped hole 10a2 communicates with the side of the first stepped hole 10a1 near the powder outlet 20b, and the size of the second stepped hole 10a2 along the second direction X is smaller than the size of the first stepped hole 10a1 along the second direction X. The fixing part 21 is disposed in the first stepped hole 10a1, and the powder scraping part 22 passes through the second stepped hole 10a2. The side of the powder scraping part 22 away from the fixing part 21 protrudes from the second stepped hole 10a2. The fixing part 21 protrudes from two blade parts 221 along the second direction X and can abut against the stepped surface of the first stepped hole 10a1. The scraper assembly 1 also includes a scraper fixing member 30, which is connected to the scraper holder 10 and limits the fixing part 21 along the first direction Z between the scraper fixing member 30 and the stepped surface. The scraper fixing member 30 is provided with a powder inlet cavity 30a, which extends through the scraper fixing member 30 along the first direction Z. One end of the powder inlet cavity 30a near the scraper fixing seat 10 is connected to the end of the powder channel 20a away from the powder outlet 20b. In this way, the step surface of the first stepped hole 10a1 limits the fixing part 21 along the first direction Z towards the side near the powder scraping part 22, and the scraper fixing member 30 limits the fixing part 21 along the other side along the first direction Z, thereby fixing the scraper 20 relative to the scraper fixing seat 10.

[0079] like Figure 7 As shown, the portion of the fixing part 21 that protrudes from the blade part 221 along the second direction X has a fixing surface 211 that abuts against the scraper fixing seat 10. It should be noted that because the scraper 20 is integrally formed, it can better ensure that the two fixing surfaces 211 are located on the same plane, so that when the scraper 20 is mounted on the scraper fixing seat 10 (see... Figure 3 When this is done, the pressure on the two blade sections 221 becomes more consistent.

[0080] In some embodiments, such as Figure 3 As shown, the end of the first stepped hole 10a1 away from the second stepped hole 10a2 passes through the scraper fixing seat 10, forming an opening 10b. The fixing part 21 is located at the lower part of the first stepped hole 10a1 along the first direction Z, close to the second stepped hole 10a2. The scraper fixing member 30 includes a pressure plate 31 and a connecting plate 32. The connecting plate 32 covers the side of the scraper fixing seat 10 with the opening 10b. The pressure plate 31 is connected to the connecting plate 32 and passes through the upper part of the first stepped hole 10a1 away from the second stepped hole 10a2, and abuts against the fixing part 21 along the first direction Z. The powder inlet cavity 30a passes through the connecting plate 32 and the pressure plate 31 respectively. In this way, the pressure plate 31 is pressed onto the scraper 20 by the connection plate 32 to ensure that the scraper 20 is fixed relative to the scraper fixing seat 10. Optionally, the connecting plate 32 and the scraper fixing seat 10 are connected by fasteners.

[0081] In some embodiments, such as Figure 3 As shown, a powder inlet 30b is formed on the side of the powder inlet cavity 30a away from the powder channel 20a. The size of the powder inlet 30b along the second direction X is larger than the size of the end of the powder inlet cavity 30a that is connected to the powder channel 20a along the second direction X, so as to facilitate powder receiving and to give the powder inlet cavity 30a enough powder material storage space so that the powder can meet the needs of two rounds of powder laying and printing after one powder receiving.

[0082] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A scraper assembly, characterized in that, include: Scraper holder; as well as, A scraper includes a fixing part and a powder scraping part distributed along a first direction. The scraper has a powder channel that passes through the fixing part and the powder scraping part along the first direction, and forms a powder outlet on the side of the powder scraping part away from the fixing part. The fixing part is mounted on a scraper mounting base, and the side of the powder scraping part away from the fixing part protrudes from the scraper mounting base along the first direction. The powder scraping part includes two blades that are spaced apart along a second direction to define the powder channel between the two blades. The scraper is integrally formed. Wherein, the first direction is perpendicular to the second direction.

2. The scraper assembly according to claim 1, characterized in that: The powder scraping section also includes two enclosed sections; The closure portion is connected between the two blade portions, and the two closure portions are respectively located at both ends of the blade portions along a third direction. The two blade portions and the two closure portions enclose the powder outlet and the powder channel, which are connected to one end of the powder outlet. The third direction is perpendicular to both the first direction and the second direction.

3. The scraper assembly according to claim 2, characterized in that: The end of the blade portion away from the fixing portion has a blade surface; The end of the closed portion away from the fixed portion has an end face; The cutting edge and the end face are coplanar.

4. The scraper assembly according to claim 1, characterized in that: The scraper also includes multiple support sections; The support is connected between the cavity walls on both sides of the powder channel along the second direction, and multiple support portions are spaced apart from each other along the third direction. The third direction is perpendicular to both the first direction and the second direction.

5. The scraper assembly according to claim 4, characterized in that: The support portion is spaced apart from the powder outlet along the first direction.

6. The scraper assembly according to claim 1, characterized in that: The scraper holder is provided with stepped holes, the stepped holes including a first stepped hole and a second stepped hole distributed along the first direction, the second stepped hole communicating with the side of the first stepped hole near the powder outlet, and the size of the second stepped hole along the second direction is smaller than the size of the first stepped hole along the second direction; The fixing part is disposed in the first stepped hole, the powder scraping part is disposed in the second stepped hole, and the side of the powder scraping part away from the fixing part protrudes from the second stepped hole. The fixing part protrudes from the two blade parts along the second direction and can abut against the stepped surface of the first stepped hole. The scraper assembly further includes a scraper fixing member, which is connected to the scraper fixing seat and limits the fixing part between the scraper fixing member and the stepped surface along the first direction; the scraper fixing member is provided with a powder inlet cavity, which passes through the scraper fixing member along the first direction, and one end of the powder inlet cavity near the scraper fixing seat is connected to the end of the powder channel away from the powder outlet.

7. The scraper assembly according to claim 6, characterized in that: The end of the first stepped hole away from the second stepped hole passes through the scraper fixing seat and forms an opening; The fixing part is located at the lower part of the first stepped hole along the first direction, close to the second stepped hole; The scraper fixing component includes a pressure plate and a connecting plate. The connecting plate covers the side of the scraper fixing seat with the opening and is connected to the scraper fixing seat. The pressure plate is connected to the connecting plate. The pressure plate passes through the upper part of the first stepped hole away from the second stepped hole and abuts against the fixing part along the first direction. The powder inlet cavity is connected to the pressure plate and the connecting plate respectively.

8. The scraper assembly according to claim 6, characterized in that: The powder inlet is formed on the side of the powder inlet chamber away from the powder channel. The size of the powder inlet along the second direction is larger than the size of the end of the powder inlet chamber that communicates with the powder channel along the second direction.

9. A powder spreading device, characterized in that, include: The scraper assembly as described in any one of claims 1 to 8; A powder spreading platform is disposed opposite to the powder outlet along the first direction; as well as, A drive mechanism is connected to the scraper assembly to drive the scraper assembly to reciprocate relative to the powder spreading platform in the second direction.

10. An additive manufacturing apparatus, characterized in that, Includes the powder spreading device as described in claim 9.

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