Scraper and additive manufacturing equipment with same

Abstract

The utility model provides a scraper and additive manufacturing equipment with the scraper. The scraper comprises a connecting part, and the connecting part is arranged on a powder laying device of the additive manufacturing equipment; the powder spreading parts are arranged on the connecting part, the contact ends of the powder spreading parts and powder are partially or completely arranged to be arc-shaped faces, and the powder spreading parts are used for preventing powder from splashing or blocking in the powder spreading process through the arc-shaped faces. According to the scraper of the double-hump structure, powder adhesion and adhesion can be avoided, and superfine metal powder can be evenly laid.

Description

Technical Field

[0001] The present application relates to the technical field of powder spreading scrapers, and more particularly to a scraper and an additive manufacturing device equipped with the scraper. Background Art

[0002] Selective Laser Melting (SLM) is an additive manufacturing technology that uses metal powder as a raw material to construct complex, multi-dimensional structures. This technology uses a high-energy laser beam focused on the metal powder, melting it and shaping it after solidification, thereby precisely constructing a specified spatial configuration. This process makes SLM particularly suitable for manufacturing highly complex and high-precision parts, such as those in aerospace, medical devices, and precision machinery.

[0003] Currently, traditional SLM processes typically use ultrafine metal powders, such as 40-micron D90 metal powder, for molding. The specific process involves first using a powder spreading device to evenly distribute the metal powder from the powder bin onto the build platform. A high-energy laser is then used to locally melt the desired area. Once the powder solidifies, the powder is deposited layer by layer until the desired part is obtained. This layer-by-layer deposition method enables the precise construction of metal parts with complex geometries.

[0004] However, in actual operation, the uniformity of powder spreading is often limited by the physical properties of the powder and the design of the equipment. Especially when using powders with poor fluidity or small particle size, powder accumulation and clogging are prone to occur at the leading edge of the scraper. Due to viscosity and mutual adhesion between powder particles, it is difficult to smoothly form a uniform powder layer on the powder spreading platform. This leads to inconsistent powder laying thickness in different areas, which in turn affects the molding accuracy and part quality. The viscosity effect is particularly significant for ultrafine metal powders, which not only affects the powder spreading efficiency but also easily causes localized accumulation of powder layers and even defective layers, thereby reducing the production stability and product quality of additive manufacturing.

[0005] Therefore, there is an urgent need for a scraper that can avoid the sticking and adhesion of ultrafine metal powder and improve the laying uniformity. Utility Model Content

[0006] The present application provides a scraper and a powder spreading device of an additive manufacturing equipment equipped with the scraper, which can avoid sticking and adhesion of powder to achieve uniform spreading of ultrafine metal powder.

[0007] In a first aspect, the present application provides a doctor blade, which includes a connecting portion disposed on a powder spreading device of an additive manufacturing apparatus; one or more powder spreading portions disposed on the connecting portion, and a contact end of the powder spreading portion with the powder is partially or entirely formed into an arc surface, wherein the powder spreading portion uses the arc surface to avoid powder splashing or clogging during the powder spreading process.

[0008] In an alternative embodiment of the first aspect, at least two powder spreading portions are provided, and a cross-section of the powder spreading portion has a convex structure.

[0009] In an alternative embodiment of the first aspect, contact ends of at least two powder spreading portions with the powder are provided with the same or different sizes.

[0010] In an alternative embodiment of the first aspect, at least two powder spreading portions are arranged in parallel along the moving direction of the connecting portion.

[0011] In an alternative embodiment of the first aspect, contact ends of at least two powder spreading portions with the powder are partially or entirely formed into an arc surface.

[0012] In an alternative embodiment of the first aspect, contact ends of at least two powder spreading portions with the powder are formed into the same or different arc surfaces.

[0013] In an alternative embodiment of the first aspect, a contact end of one of the powder spreading portions with the powder is formed into a partial arc surface, and a contact end of the other powder spreading portion with the powder is formed into an entire arc surface.

[0014] In an alternative embodiment of the first aspect, contact ends of at least two powder spreading portions with the powder are formed into arc surfaces with the same or different radian.

[0015] In an alternative embodiment of the first aspect, at least two powder spreading portions are disposed on the connecting portion in a fitting or spaced manner.

[0016] In an alternative embodiment of the first aspect, at least two powder spreading portions are disposed on the connecting portion in a spaced manner, and a slow-down space with adjustable width and depth is formed between the spaced powder spreading portions, and the powder spreading portion reduces powder accumulation and trailing during the powder spreading process through the slow-down space.

[0017] In an alternative embodiment of the first aspect, a cross-section of the slow-down space formed by the spaced arrangement of at least two powder spreading portions has a trapezoidal structure.

[0018] In an alternative embodiment of the first aspect, at least two powder spreading portions are symmetrically or asymmetrically arranged on the connecting portion.

[0019] In a second aspect, the present application provides an additive manufacturing apparatus equipped with the doctor blade. Description of the Drawings

[0020] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate one or more embodiments of the present application and, together with the description, serve to explain the principles of the present application and to enable one of ordinary skill in the relevant art to make and use the present application.

[0021] Figure 1 It is a schematic diagram of an exemplary existing planar structure scraper.

[0022] Figure 2 It is a schematic diagram of powder accumulation using a scraper according to an existing exemplary planar structure.

[0023] Figure 3 This is a schematic diagram of an exemplary one-piece molded double-hump structure scraper according to some embodiments of the present application.

[0024] Figure 4 It is a cross-sectional schematic diagram of an exemplary one-piece molded double-hump structure scraper according to some embodiments of the present application.

[0025] Figure 5 This is a schematic diagram of an exemplary split-lamination double-hump structure scraper according to some embodiments of the present application.

[0026] Figure 6 It is a cross-sectional schematic diagram of an exemplary split-laminated double-hump structure scraper according to some embodiments of the present application.

[0027] Figure 7 This is a schematic diagram of an exemplary split-spaced double-hump structure scraper according to some embodiments of the present application.

[0028] Figure 8 It is a cross-sectional schematic diagram of an exemplary split-spaced double-hump structure scraper according to some embodiments of the present application.

[0029] Figure 9 It is a cross-sectional schematic diagram of an exemplary trapezoidal scraper with a mitigation space according to some embodiments of the present application.

[0030] Figure 10 It is a cross-sectional schematic diagram of an exemplary mitigation space width and depth adjustable scraper according to some embodiments of the present application.

[0031] Figure 11 It is a cross-sectional schematic diagram of an exemplary scraper with an asymmetrically arranged double-hump structure according to some embodiments of the present application.

[0032] Figure 12 It is a three-dimensional schematic diagram of powder accumulation using a scraper according to an existing exemplary planar structure.

[0033] Figure 13 It is a three-dimensional schematic diagram of an exemplary double-hump structure doctor blade according to some embodiments of the present application.

[0034] Figure 14 It is a three-dimensional schematic diagram of an exemplary single-hump structure doctor blade according to the existing technology.

[0035] Figure 15 It is a comparative schematic diagram of an exemplary flat structure doctor blade and a single-hump structure doctor blade according to the existing technology.

[0036] Figure 16 It is a comparative schematic diagram of a single-hump structure doctor blade and a double-hump structure doctor blade according to some embodiments of the present application.

[0037] Explanation of reference numerals:

[0038] 1, forming platform; 2, flat structure doctor blade; 3, double-hump structure doctor blade; 4, powder; 5, single-hump structure doctor blade; 30, connecting part; 31, powder spreading part; 50, single-hump protrusion; 310a, hump protrusion I; 310b, hump protrusion II; 311, all arc surfaces; 312, radian curved surface a; 313, radian curved surface b; 314, slow-down space; 315, isosceles trapezoid slow-down space; 316, inverted isosceles trapezoid slow-down space; 317, first right trapezoid slow-down space; 318, second right trapezoid slow-down space; 3100, fitting part; 3101, spacing part. Detailed implementation manners

[0039] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application.

[0040] To illustrate the solution of the present application, reference is made to Figure 1 and Figure 2 as shown, Figure 1 shows a flat structure doctor blade 2, Figure 2 shows the powder spreading and accumulation of the existing flat structure doctor blade 2; during the powder spreading process, a lot of powder 4 accumulates at the front edge of the doctor blade. Especially for the powder 4 with poor fluidity, due to the viscosity and adhesion between the powders 4, it is often difficult to effectively form a uniform powder layer on the flat surface. As a result, in the powder spreading process, there is more powder 4 in some places and less in others, and a uniform powder layer thickness cannot be formed, as Figure 12 shown, Figure 2Shows a three-dimensional schematic diagram of an existing exemplary planar structure blade powder spreading and stacking.

[0041] Refer to Figure 14 as shown, [[ID= shows a three-dimensional schematic diagram of the single-hump structure blade 5. If the planar structure blade is changed to a single-hump structure, although it can effectively avoid the adhesion of the powder 4 to form a powder layer, it will cause relatively large splashing during the powder spreading process, affecting the powder spreading effect; specifically, refer to ​ as shown, ​ shows a comparison schematic diagram of the planar structure blade 2 and the single-hump structure blade 5. The single-hump structure is based on the planar structure blade 2, and the contact end of the blade with the powder 4 is adjusted to an arc surface to form a single-hump protrusion 50.

[0042] Specifically, refer to ​ as shown, ​ shows a comparison schematic diagram of the single-hump structure blade 5 and the double-hump structure blade 3 of the present application. The double-hump structure blade 3 of the present application is based on the single-hump structure blade 5, and the contact end of the blade with the powder is set to at least two, and the contact end of the blade with the powder 4 is adjusted to an arc surface to form a hump protrusion I 310a and a hump protrusion II 310b. Compared with the planar structure blade 2 and the single-hump structure blade 5, each hump protrusion of the double-hump structure blade 3 of the present application has an arc-shaped arc surface. During the powder spreading process, the arc surface first contacts the powder 4. At this time, the powder 4 contacts the arc surface of the hump protrusion. Due to the existence of the arc surface, it can effectively avoid the splashing or blockage of the powder 4 at the front edge of the blade during the powder spreading process.

[0043] Therefore, in order to avoid the viscosity and adhesion between the powders 4 to form a uniform powder layer thickness, refer to ​ and ​ as shown, ​ shows a schematic diagram of a blade involved in the present application, ​ shows a three-dimensional schematic diagram of the double-hump structure blade involved in the present application. The blade includes a connecting portion 30 installed on the powder spreading device of the additive manufacturing equipment and one or more powder spreading portions 31 connected to the connecting portion 30. The contact end of the powder spreading portion 31 with the powder 4 to be laid is partially or completely set as an arc surface. Among them, the powder spreading portion 31 avoids the splashing or blockage of the powder 4 during the powder spreading process through the arc surface, and can avoid the viscosity and adhesion of the powder 4. Especially for the ultra-fine metal powder 4, the uniform laying of the ultra-fine metal powder 4 can be realized.

[0044] Specifically, the powder spreading portion 31 is installed on the powder spreading device of the additive manufacturing equipment through the connecting portion 30. The cross-section of the contact end of the powder spreading portion 31 with the powder 4 is in a convex structure, and the end of the powder spreading portion 31 in contact with the powder 4 is designed as an arc surface, thus referring to​ As shown ​ ​ shows a schematic diagram of the powder spreading part 31 of the embodiment of the present application with a double-hump structure design, that is, the powder spreading part 31 of the doctor blade of the present application has a double-hump structure, and each hump structure has a transition arc. During the powder spreading process, the arc structure first contacts the powder 4. At this time, the powder 4 contacts the arc surface of the arc structure. Due to the existence of the arc structure, the friction between the powder 4 and the surface of the powder spreading part 31 can be reduced, and the phenomenon of powder 4 blockage caused by poor fluidity can be reduced. Therefore, the powder spreading part 31 of the present application can effectively avoid the powder 4 splashing or blockage at the front edge of the powder spreading part 31 during the powder spreading process.

[0045] In some embodiments, referring to ​ (a) as shown ​ (a) shows that the powder spreading part 31 of the present application is provided with an integrally formed double-hump structure, and the contact end of the powder spreading part 31 with the powder 4 is designed as an all-arc surface 311. During the powder spreading process, the all-arc surface 311 enables the powder 4 to be evenly distributed on the forming platform 1 of the additive manufacturing equipment and avoids the powder 4 splashing or blockage at the front edge of the powder spreading part 31 during the powder spreading process.

[0046] In some embodiments, referring to ​ (b) as shown ​ (b) shows that the powder spreading part 31 of the present application is provided with an integrally formed double-hump structure, and the contact end of the powder spreading part 31 with the powder 4 is designed as a partially combined arc surface, that is, the contact end of the powder spreading part 31 with the powder 4 is a small-curvature arc surface a312 that gradually transitions to a large-curvature arc surface b313; during the powder spreading process, when the powder spreading part 31 first contacts the powder 4, the powder spreading part 31 can be gradually pushed along the small-curvature surface and a more uniform powder spreading effect can be achieved through the large-curvature surface in the latter stage. This design can further avoid the powder 4 from accumulating or splashing during the powder spreading process, and at the same time improve the accuracy and uniformity of powder spreading.

[0047] In some embodiments, referring to ​ (c) as shown ​ (c) shows that the powder spreading part 31 of the present application is provided with an integrally formed double-hump convex structure, and the contact end of the powder spreading part 31 with the powder 4 is designed as all-arc surfaces 311 with inconsistent sizes, that is, the arc size of the contact end of the hump convex I310a with the powder 4 is smaller than the arc size of the contact end of the hump convex II310b with the powder 4; during the powder spreading process, the smaller hump convex I310a gently pushes the powder 4 at the initial stage of powder spreading, while the larger hump convex II310b levels the powder layer, so as to further ensure the uniform laying of the powder 4 on the platform through arc surfaces of different sizes and avoid excessive powder 4 accumulation or splashing.

[0048] In specific implementation, the hump protrusions of the powder spreading part 31 with inconsistent sizes can also be set to have different protruding distances, that is, the protruding distance of the hump protrusion I310a with a smaller arc is less than that of the hump protrusion II310b with a larger arc, so as to form a powder 4 contact area in stages during the powder spreading process; First of all, the hump protrusion I310a with a smaller arc processes the powder 4 with relatively poor initial fluidity through a lower pressure to reduce the accumulation and blockage of the powder 4, while the hump protrusion II310b with a larger arc further finely adjusts the powder 4 to compact and evenly lay the powder 4, which can improve the layer uniformity of the ultra-fine metal powder 4 laying.

[0049] In some embodiments, referring to ​ (d) as shown, ​ (d) shows that the powder spreading part 31 of the present application is set as an integrally formed double-hump protrusion, and the contact end of the powder spreading part 31 with the powder 4 is designed as a partially combined arc surface with inconsistent sizes, that is, the contact end of the hump protrusion I310a of the powder spreading part 31 with the powder 4 is a small-arc curved surface a312, which gradually transitions to a large-arc curved surface b313; the contact end of the other hump protrusion II310b with the powder 4 is a full arc surface 311; during the powder spreading process, when the powder spreading part 31 just contacts the powder 4, the smaller hump protrusion I310a can gradually push along the small-arc curved surface and achieve a more uniform powder spreading effect through the large-arc curved surface in the later stage, while the larger hump protrusion II310b compacts and evenly lays the powder 4. This design can further avoid the accumulation or splashing of the powder 4 during the powder spreading process, improve the accuracy and uniformity of powder spreading at the same time, and through this arc combination, the powder spreading process can achieve continuous regulation from gentle transition to fine adjustment.

[0050] Exemplarily, the arc radian size of the hump protrusion of the powder spreading part 31 of the present application is related to the particle size of the powder 4. For example: if the D90 of the powder 4 used in the additive manufacturing equipment is 40-60 microns, the operator sets the arc radian diameter of the hump protrusion of the powder spreading part 31 to 3-5 mm; if the D90 of the powder 4 is 15-25 microns, the operator sets the arc radian diameter of the hump protrusion of the powder spreading part 31 to 2-4 mm. The specific arc radian diameter of the hump protrusion of the powder spreading part 31 is adjusted by the operator according to actual needs.

[0051] In some embodiments, referring to ​ and ​ as shown, ​ and ​The powder spreading part 31 of the present application is shown as a split double-hump structure, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 is a split double-protrusion structure, and the double-protrusion structure is an independent split design. The two hump protrusions are arranged in contact with each other at the connecting part 30 and are installed parallel to the moving direction of the connecting part 30. Each hump protrusion can be installed and disassembled independently; through this design, operators can replace or maintain one of the hump protrusions according to actual needs or the characteristics of the powder 4 without disassembling the entire scraper; for example, under the conditions of large changes in the particle size of the powder 4 or different materials, one of the hump protrusions can be quickly replaced to ensure flexibility and accuracy during the powder spreading process and improve the efficiency of the production line.

[0052] Specifically, the independent split double-hump structure can not only achieve the functions of the integrally formed double-hump protrusions described above, but also facilitate individual maintenance and replacement. When one of the hump protrusions needs to be replaced due to wear or other reasons, the problematic hump protrusion can be quickly disassembled and replaced without affecting the other hump protrusions.

[0053] In the actual implementation process, the contact end of the split-designed hump protrusion with the powder 4 is designed as an all-arc surface 311. During the powder spreading process, the all-arc surface 311 enables the powder 4 to be evenly distributed on the forming platform 1 of the additive manufacturing equipment and avoids powder 4 splashing or clogging at the front edge of the powder spreading part 31 during the powder spreading process.

[0054] In some embodiments, referring to ​ (b) as shown, ​ (b) shows that the powder spreading part 31 of the present application is set as a split double-hump structure, and the contact end of the powder spreading part 31 with the powder 4 is designed as a partially combined arc surface, that is, the contact end of the powder spreading part 31 with the powder 4 is a small-arc curved surface a312 that gradually transitions to a large-arc curved surface b313; during the powder spreading process, when the powder spreading part 31 first contacts the powder 4, the powder spreading part 31 can be gradually pushed along the small-arc curved surface and a more uniform powder spreading effect can be achieved through the large-arc curved surface in the latter stage, and this design can further avoid powder 4 accumulation or splashing during the powder spreading process and improve the accuracy and uniformity of powder spreading.

[0055] In some embodiments, referring to ​ (c) as shown, ​(c) shows that the powder spreading part 31 of the present application is arranged as a split double-hump protrusion, and the contact end of the powder spreading part 31 with the powder 4 is designed as an all-arc surface 311 and a partial combined arc surface. That is, the contact end of the hump protrusion I310a of the powder spreading part 31 with the powder 4 is a radian curved surface a312 with a small radian, which gradually transitions to a radian curved surface b313 with a large radian; the contact end of the other hump protrusion II310b with the powder 4 is the all-arc surface 311. During the powder spreading process, when the powder spreading part 31 first contacts the powder 4, the hump protrusion I310a of the partial combined arc surface can be gradually pushed along the small-radian curved surface, and a more uniform powder spreading effect can be achieved through the large-radian curved surface in the later stage. And the hump protrusion II310b of the all-arc surface 311 compacts and evenly lays the powder 4. This design can further avoid the accumulation or splashing of the powder 4 during the powder spreading process, improve the accuracy and uniformity of powder spreading at the same time, and through this radian combination, the powder spreading process can achieve continuous regulation from gentle transition to fine adjustment.

[0056] In some embodiments, referring to ​ (d) as shown, ​ (d) shows that the powder spreading part 31 of the present application is arranged as a split double-hump protrusion, and the contact end of the powder spreading part 31 with the powder 4 is designed as all-arc surfaces 311 with inconsistent sizes. That is, the arc size of the contact end of the hump protrusion I310a of the powder spreading part 31 with the powder 4 is smaller than the arc size of the contact end of the other hump protrusion II310b with the powder 4. During the powder spreading process, the smaller hump protrusion I310a gently pushes the powder 4 at the initial stage of powder spreading, while the larger hump protrusion II310b flattens the powder layer, so as to further ensure the uniform laying of the powder 4 on the platform through arc surfaces of different sizes and avoid excessive accumulation or splashing of the powder 4.

[0057] In some embodiments, referring to ​ (e) as shown, ​ (e) shows that the powder spreading part 31 of the present application is arranged as a split double-hump protrusion, and the contact end of the powder spreading part 31 with the powder 4 is designed as partial combined arc surfaces with inconsistent sizes. That is, the contact ends of the two hump protrusions of the powder spreading part 31 with the powder 4 are both set as a radian curved surface a312 with a small radian, which gradually transitions to a radian curved surface b313 with a large radian. During the powder spreading process, when the powder spreading part 31 first contacts the powder 4, the smaller hump protrusion I310a can be gradually pushed along the small-radian curved surface and a more uniform powder spreading effect can be achieved through the large-radian curved surface in the later stage. The larger hump protrusion II310b can gradually compact along the small-radian curved surface and further compact the powder 4 through the large-radian curved surface in the later stage, ensuring the uniformity and flatness of the powder layer. Through the gradual transition design of the partial combined arc surfaces with inconsistent sizes, the laying quality of the powder 4 can be improved and it can adapt to powder 4 materials with different fluidities.

[0058] In some embodiments, referring to ​ as shown in (f), ​ (f) shows that the powder spreading part 31 of the present application is arranged in a split double-hump convex structure, and the contact ends of the double-hump convex with the powder 4 are designed as all arc surfaces 311 and partial combined arc surfaces with inconsistent sizes. That is, the contact ends of one hump convex I310a of the powder spreading part 31 with the powder 4 are all set as a radian curved surface a312 with a small radian, which gradually transitions to a radian curved surface b313 with a large radian; the contact ends of the other hump convex II310b with the powder 4 are set as all arc surfaces 311; during the powder spreading process, when the powder spreading part 31 just contacts the powder 4, the smaller hump convex I310a can push the powder 4 step by step along the small-radian curved surface and achieve a more uniform powder spreading effect through the large-radian curved surface in the later stage, so as to reduce the accumulation and splashing of the powder 4, adapt to powders 4 with different fluidities, and make the powder spreading process smoother; furthermore, the larger hump convex II310b can evenly distribute the compaction force, thereby eliminating the phenomenon of local powder 4 accumulation or over-compaction during the powder spreading process and ensuring the thickness consistency and flatness of the final powder layer.

[0059] Thus, in specific implementation, the split double-hump convex of the above-mentioned powder spreading part 31 can also be set with different protruding distances, that is, the protruding distance of one hump convex of the powder spreading part 31 is less than that of the other hump convex, so as to form a phased powder 4 contact area during the powder spreading process; first, the hump convex with a short protruding distance processes the powder 4 with poor initial fluidity through a lower pressure to reduce the accumulation and blockage of the powder 4, while the hump convex with a long protruding distance further finely adjusts the powder 4 to compact and evenly lay the powder 4, which can improve the layer uniformity of the ultra-fine metal powder 4 laying.

[0060] In some embodiments, referring to ​ and ​ as shown, ​ and ​ show that the powder spreading part 31 of the present application is arranged in a split double-hump structure, that is, the cross-section of the powder spreading part 31 in contact with the powder 4 is a split double-convex structure arranged at intervals, and the double-convex structure is an independent split design. The two hump convexes are arranged at intervals on the connecting part 30 and are installed parallel to the movement direction of the connecting part 30. Each hump convex can be installed and disassembled separately; a slow-down space 314 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals. Through the interval arrangement, not only can the double-hump structure of this embodiment achieve the effects of the double-hump structure arranged in a fitting manner in the above-mentioned embodiment, but also the slow-down space 314 can reduce the powder 4 accumulation and trailing during the powder spreading process and improve the powder 4 laying effect.

[0061] During the powder spreading process, the powder 4 is first pushed by the hump protrusions that come into contact first. After preliminary leveling, it enters the slow-down space 314 between the spaced-apart hump protrusions. In this slow-down space 314, the flow rate of the powder 4 will slow down, preventing the powder 4 from immediately piling up or flowing unevenly after being pushed by the hump protrusions, reducing the phenomenon of powder 4 piling up during the powder spreading process. Especially when dealing with powders 4 with poor fluidity, it can significantly improve the spreading effect of the powder 4.

[0062] In some embodiments, as shown in ​ (b), ​ (b) shows that the powder spreading part 31 of the present application is set as a double-hump structure with a split interval, and the contact end of the hump protrusion and the powder 4 is designed as a partially combined arc surface, that is, the contact end of all hump protrusions and the powder 4 is a small-arc curved surface a312, gradually transitioning to a large-arc curved surface b313; during the powder spreading process, when one of the hump protrusions first comes into contact with the powder 4, it can gradually push the powder 4 along the small-arc curved surface and achieve a more uniform powder spreading effect through the large-arc curved surface in the later stage. And by the slow-down space 314, the flow rate of the powder 4 is slowed down, preventing the powder 4 from piling up or flowing unevenly, improving the accuracy and uniformity of powder spreading.

[0063] In some embodiments, as shown in ​ (c), ​ (c) shows that the powder spreading part 31 of the present application is set as a double-hump protrusion with a split interval, and the contact end of the powder spreading part 31 and the powder 4 is designed as an all-arc surface 311 and a partially combined arc surface with inconsistent sizes, that is, the contact end of one of the hump protrusions I310a of the powder spreading part 31 and the powder 4 is a small-arc curved surface a312, gradually transitioning to a large-arc curved surface b313; the contact end of the other hump protrusion II310b and the powder 4 is an all-arc surface 311; during the powder spreading process, when the powder spreading part 31 first comes into contact with the powder 4, the smaller hump protrusion can gradually push along the small-arc curved surface and achieve a more uniform powder spreading effect through the large-arc curved surface in the later stage. When the powder 4 enters the slow-down space 314 through the smaller hump protrusion I310a, the flow rate of the powder 4 is slowed down by the slow-down space 314, preventing the powder 4 from piling up or flowing unevenly, and then the powder 4 is compacted and evenly spread by the hump protrusion II310b with the larger all-arc surface 311, thereby further preventing the powder 4 from piling up or splashing during the powder spreading process, while improving the accuracy and uniformity of powder spreading. And through this arc combination, the powder spreading process can achieve continuous regulation from gentle transition to fine adjustment.

[0064] In some embodiments, as shown in ​ (d), ​(d) shows that the powder spreading part 31 of the present application is arranged as a double-hump convexity with a split interval, and the contact end of the powder spreading part 31 with the powder 4 is designed as an all-arc surface 311 with inconsistent sizes, that is, the arc size of the contact end of one hump convexity I310a of the powder spreading part 31 with the powder 4 is smaller than the arc size of the contact end of the other hump convexity II310b with the powder 4; during the powder spreading process, the smaller hump convexity gently pushes the powder 4 at the initial stage of powder spreading. When the powder 4 enters the slow-down space 314 through the smaller hump convexity I310a, the flow rate of the powder 4 is slowed down through the slow-down space 314 to avoid the accumulation or uneven dispersion of the powder 4. Then, the powder layer is evenly laid through the larger hump convexity II310b, so as to further ensure the even laying of the powder 4 on the platform through arc surfaces of different sizes and avoid excessive accumulation or splashing of the powder 4.

[0065] In some embodiments, referring to ​ (e) as shown, ​ (e) shows that the powder spreading part 31 of the present application is arranged as a double-hump convexity with a split interval, and the contact end of the powder spreading part 31 with the powder 4 is designed as a partially combined arc surface with inconsistent sizes, that is, the contact ends of the two hump convexities of the powder spreading part 31 with the powder 4 are both set as a radian curved surface a312 with a small radian, gradually transitioning to a radian curved surface b313 with a large radian, and the size of one hump convexity I310a is smaller than that of the other hump convexity II310b; during the powder spreading process, when the powder spreading part 31 first contacts the powder 4, the smaller hump convexity I310a can gradually push along the small-radian curved surface and achieve a more uniform powder spreading effect through the large-radian curved surface in the later stage. When the powder 4 enters the slow-down space 314 through the smaller hump convexity I310a, the flow rate of the powder 4 is slowed down through the slow-down space 314 to avoid the accumulation or uneven dispersion of the powder 4. Then, the larger hump convexity II310b gradually compacts along the small-radian curved surface and further compacts the powder 4 through the large-radian curved surface in the later stage to ensure the uniformity and flatness of the powder layer. Through the gradual transition design of the partially combined arc surface with inconsistent sizes, the laying quality of the powder 4 can be improved, and it can adapt to powder 4 materials with different fluidities.

[0066] In some embodiments, referring to ​ as shown, ​It is shown that the powder spreading part 31 of the present application is provided with a double-hump structure in which the slow-down space 314 is trapezoidal, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 is a split double-protrusion structure arranged at intervals, and the shape of the slow-down space 314 is designed as a trapezoid. The double-protrusion structure is an independent split design. The two hump protrusions are arranged at intervals on the connecting part 30 and are installed in parallel along the moving direction of the connecting part 30. Each hump protrusion can be installed and disassembled separately; a trapezoidal slow-down space 314 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals. Through the spaced arrangement, not only can the double-hump structure of this embodiment achieve the effects of the double-hump structure arranged in a fitting manner in the above embodiment, but also the powder accumulation and trailing during the powder spreading process can be reduced through the slow-down space 314, improving the powder spreading effect of the powder 4.

[0067] During the powder spreading process, the powder 4 is first pushed by the first contacted hump protrusion I310a. After preliminary leveling, it enters the trapezoidal slow-down space 314 between the spaced hump protrusions. In this slow-down space 314, the speed of the powder 4 gradually slows down during the flowing process, thereby avoiding the accumulation or uneven flow dispersion of the powder 4 during the powder spreading process, reducing the powder accumulation phenomenon during the powder spreading process. Especially when dealing with powders 4 with poor fluidity, the powder spreading effect of the powder 4 can be significantly improved.

[0068] In some embodiments, referring to ​ (a) as shown, ​ (a) shows that the powder spreading part 31 of the present application is provided with a double-hump structure in which the slow-down space 314 is an isosceles trapezoid, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 is a split double-protrusion structure arranged at intervals, and the shape of the slow-down space 314 is designed as an isosceles trapezoid. The double-protrusion structure is an independent split design. The two hump protrusions are arranged at intervals on the connecting part 30 and are installed in parallel along the moving direction of the connecting part 30. Each hump protrusion can be installed and disassembled separately; an isosceles trapezoidal slow-down space 315 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals.

[0069] In some embodiments, referring to ​ (b) as shown, ​ (b) shows that the powder spreading part 31 of the present application is provided with a double-hump structure in which the slow-down space 314 is an inverted isosceles trapezoid, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 is a split double-protrusion structure arranged at intervals, and the shape of the slow-down space 314 is designed as an inverted isosceles trapezoid. The double-protrusion structure is an independent split design. The two hump protrusions are arranged at intervals on the connecting part 30 and are installed in parallel along the moving direction of the connecting part 30. Each hump protrusion can be installed and disassembled separately; an inverted isosceles trapezoidal slow-down space 316 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals.

[0070] In some embodiments, referring to ​ as shown in (c), ​ (c) shows that the powder spreading part 31 of the present application is arranged such that the slow-down space 314 has a double-hump structure in the shape of a first right trapezoid, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 has a split double-protrusion structure arranged at intervals, and the shape of the slow-down space 314 is designed as an isosceles trapezoid slow-down space 317 of a first right trapezoid. This double-protrusion structure is an independent split design. Two hump protrusions are arranged at intervals on the connecting part 30 and are installed in parallel along the movement direction of the connecting part 30. Each hump protrusion can be installed and disassembled separately; an inverted first right trapezoid slow-down space 317 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals.

[0071] In some embodiments, referring to ​ as shown in (d), ​ (d) shows that the powder spreading part 31 of the present application is arranged such that the slow-down space 314 has a double-hump structure in the shape of a second right trapezoid, that is, the cross-section of the powder spreading part 31 at the end in contact with the powder 4 has a split double-protrusion structure arranged at intervals, and the shape of the slow-down space 314 is designed as a second right isosceles trapezoid slow-down space 318. This double-protrusion structure is an independent split design. Two hump protrusions are arranged at intervals on the connecting part 30 and are installed in parallel along the movement direction of the connecting part 30. Each hump protrusion can be installed and disassembled separately; a second right isosceles trapezoid slow-down space 315 with adjustable width and depth is formed between the powder spreading parts 31 arranged at intervals.

[0072] Thus, referring to ​ as shown, ​ it shows that the powder spreading part 31 of the present application is arranged as a split and double-hump structure with adjustable width and depth. In specific implementation, in the above embodiment of split and spaced double-hump protrusions, the width of the slow-down space 314 can be adjusted by the distance between the spaced hump protrusions, that is, the width of the slow-down space 314 is the spacing distance between the spaced hump protrusions. Exemplarily, for example, when processing finer powder 4, the width of the slow-down space 314 can be reduced so that the powder 4 can pass through more closely, reducing the loss and splashing of the powder 4. When processing larger particles or powders 4 with better fluidity, the width of the slow-down space 314 can be increased to ensure smoother flow of the powder 4 between the hump protrusions and avoid clogging of the powder 4 due to too small a space. Further, referring to ​ as shown in (b), ​(b) shows a double-hump structure in which the powder spreading part 31 of the present application is arranged in a split manner and partially fitted. The spaced hump protrusions are divided into a fitting part 3100 and a spaced part 3101, and the depth of the buffer space 314 is adjusted by the size of the fitting part 3100 of the spaced hump protrusions; specifically, the adjustment of the depth of the buffer space 314 can be adapted according to the thickness requirements of different powder layers 4 to ensure that the powder 4 meets the laying requirements needed by the operator after passing over the hump protrusions.

[0073] In some embodiments, referring to ​ as shown, ​ it shows a double-hump structure in which at least two powder spreading parts 31 of the present application are arranged in an asymmetrically fitted manner, that is, the width dimension of one hump protrusion I310a of the powder spreading part 31 is greater than the width dimension of the other hump protrusion II310b, and the two hump protrusions are fitted and installed; ​ (b) shows a double-hump structure in which at least two powder spreading parts 31 of the present application are arranged in an asymmetrically spaced manner, that is, the width dimension of one hump protrusion I310a of the powder spreading part 31 is greater than the width dimension of the other hump protrusion II310b, and the two hump protrusions are spaced and installed. During the powder spreading process, the hump protrusion I310a with a larger width dimension is used for the preliminary spreading of the powder 4. Due to its larger contact area, it can level and distribute the powder 4 in a larger range, effectively reducing the accumulation and uneven distribution of the powder 4. At the same time, the design of the larger width can also improve the stability of powder spreading, avoiding the phenomenon of powder 4 splashing or accumulating in high-friction areas, and is particularly suitable for powder 4 materials with poor fluidity or larger particles; while the hump protrusion II310b with a smaller width dimension is mainly used for delicate powder 4 spreading and fine adjustment of local areas. Its smaller contact area enables it to more flexibly adjust the flow direction and distribution of the powder 4 when contacting the powder 4. Especially in areas with complex shapes or fine structures, higher powder spreading accuracy and surface quality can be achieved through precise pushing and compaction.

[0074] In some embodiments, the present application also provides an additive manufacturing device equipped with the doctor blade of at least one of the above embodiments.

[0075] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A scraping tool, characterized in that, Comprising: A connecting part, which is arranged on the powder spreading device of the additive manufacturing equipment; One or more powder spreading parts, which are arranged on the connecting part, and the contact end of the powder spreading part with the powder is partially or wholly arranged as an arc surface, wherein the powder spreading part is used to avoid powder splashing or blocking during the powder spreading process through the arc surface.

2. The doctor blade according to claim 1, characterized in that There are at least two powder spreading parts, and the cross-section of the powder spreading part is in a convex structure.

3. The doctor blade according to claim 1 or 2, characterized in that, The contact ends of at least two powder spreading parts with the powder are arranged with the same or different sizes.

4. The doctor blade according to claim 3, characterized in that, At least two powder spreading parts are arranged in parallel along the moving direction of the connecting part.

5. The doctor blade according to claim 1 or 2, characterized in that The contact ends of at least two powder spreading parts with the powder are partially or wholly arranged as arc surfaces.

6. The doctor blade according to claim 1 or 2, characterized in that, The contact ends of at least two powder spreading parts with the powder are arranged with the same or different arc surfaces.

7. The doctor blade according to claim 6, wherein The contact end of one of the powder spreading parts with the powder is arranged as a partial arc surface, and the contact end of the other powder spreading part with the powder is arranged as a whole arc surface.

8. The doctor blade according to claim 6, characterized in that, The contact ends of at least two powder spreading parts with the powder are arranged with the same or different radian arc surfaces.

9. The doctor blade according to claim 1 or 2, characterized in that, At least two powder spreading parts are arranged on the connecting part in a fitting or spaced manner.

10. The doctor blade according to claim 9, wherein, At least two powder spreading parts are arranged on the connecting part in a spaced manner, and a slow-down space with adjustable width and depth is formed between the spaced powder spreading parts, and the powder spreading part reduces powder accumulation and trailing during the powder spreading process through the slow-down space.

11. The doctor blade according to claim 10, wherein The cross-section of the slow-down space formed by the spaced arrangement of at least two powder spreading parts is in a trapezoidal structure.

12. The doctor blade according to claim 1 or 2, characterized in that, At least two powder spreading parts are arranged on the connecting part symmetrically or asymmetrically.

13. An additive manufacturing equipment with a doctor blade according to any one of claims 1-12.

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