Scraper assembly and SLM equipment

Abstract

The utility model belongs to the technical field of additive manufacturing, and provides a scraper assembly and SLM equipment with the scraper assembly, the scraper assembly comprises a scraper arranged on a material cylinder, the scraper comprises a first scraper body and a second scraper body, the bottom of the first scraper body is flush with the bottom of the second scraper body, and the scraper body is arranged on the material cylinder. The first end of the first cutter body is connected with the first end of the second cutter body, the included angle between the length direction of the first cutter body and the second cutter body and the movement direction of the first cutter body and the second cutter body is alpha, and alpha is an acute angle. The scraper assembly and the SLM equipment provided by the utility model are simple in structure and reasonable in design, and can reduce the loss of powder in the process of scraping the powder by the scraper.

Description

Technical Field

[0001] The utility model relates to the technical field of additive manufacturing, and in particular to a scraper assembly and SLM equipment. Background Art

[0002] Selective laser melting (SLM) is an advanced metal additive manufacturing technology. This technology uses laser as the energy source and scans the metal powder bed layer by layer according to the path planned in the 3D CAD slice model. The scanned metal powder is melted and solidified to achieve the metallurgical bonding effect, and finally the metal parts designed by the model are obtained. Since the SLM process has significant advantages in manufacturing metal parts with complex geometric shapes, it is widely used in aerospace, automotive, medical and other fields.

[0003] In this molding process, because the density of the powder is only about 60% of the solid after laser melting, the height of each layer of laser-melted solid surface will be lower than the height of the unmelted powder surface, thus forming a height difference. After the molding platform drops a layer thickness, when the scraper spreads the powder again, the powder required for the current layer not only needs to fill the height of the molding platform, but also needs to supplement the height difference between the solid layer and the powder layer. This makes the amount of powder supplied by each layer of the cylinder greater than the drop of the molding platform.

[0004] like Figure 1 As shown, when a conventional linear scraper is used, the contact surface between the scraper and the metal powder is perpendicular to the direction of movement of the scraper. When the scraper moves, due to the inertia and fluidity of the powder, the powder will gradually flow out to the edge of the scraper, resulting in less actual available powder, causing the north-south position of the molding surface to have less powder supply than the middle position. In order to ensure that there is enough powder in the north and south positions, the height of each layer of the material cylinder can only be increased to increase the powder supply. In this case, the powder supply in the middle is far exceeded and enters the overflow powder tank, which needs to be re-screened before it can be reused. In addition, the powder flowing out from the edge of the scraper will also increase. This part of the powder will gradually accumulate. After accumulating to a certain height, it will be blown away by the wind field and enter the filter element. It can no longer be recycled, resulting in material waste.

[0005] In addition, for equipment with a downward-feeding powder cylinder powder supply mode, due to limitations such as the equipment's overall dimensions, the cylinder's depth and cross-sectional dimensions, the effective utilization rate of the powder will result in a full cylinder of powder not being enough to print parts to the maximum depth of the forming cylinder. This requires opening the chamber midway to add powder, which has a significant impact on part quality and stability. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a scraper assembly and a SLM device to solve or alleviate the above-mentioned technical problems existing in the prior art.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a scraper assembly, including a scraper arranged on a material cylinder, the scraper including a first blade body and a second blade body, the bottoms of the first blade body and the second blade body are kept flush, the first end of the first blade body is connected to the first end of the second blade body, and the angle between the length direction of the first blade body and the second blade body and their own movement direction is α, wherein α is an acute angle.

[0008] Furthermore, the first blade body and the second blade body are integrally formed.

[0009] Further, the first end of the first blade body abuts against the first end of the second blade body.

[0010] Furthermore, the first end of the second blade body extends a preset distance toward the second end of the first blade body.

[0011] Furthermore, it also includes:

[0012] A first mounting seat, a first end of which is hinged to the material cylinder, and a second end of which can swing back and forth between a first position and a second position around a hinge center line;

[0013] A second mounting seat, a first end of which is hinged to the material cylinder, and a second end of which can swing back and forth between a third position and a first position around a hinge center line;

[0014] A first locking structure, used to lock the first mounting seat; and

[0015] A second locking structure, used to lock the second mounting seat;

[0016] The first blade body is provided with a plurality of first strip grooves, the length direction of the first strip grooves is consistent with the length direction of the first blade body, a first bolt is inserted into the first strip groove, and the first bolt is threadedly connected to the first mounting seat;

[0017] The second blade body is arranged on the second mounting seat, and a plurality of second strip grooves are arranged on the second blade body, the length direction of the second strip grooves is consistent with the length direction of the second blade body, a second bolt is inserted into the second strip groove, and the second bolt is threadedly connected to the second mounting seat.

[0018] Furthermore, the first locking structure comprises:

[0019] A first locking bolt, which is disposed at the second end of the first mounting seat and is rotatably connected to the first mounting seat; and

[0020] A first locking slider, which is slidably connected to the cylinder;

[0021] Wherein, a first sliding hole is provided at the bottom of the material cylinder, and a threaded end of the first locking bolt passes through the first sliding hole and is threadedly connected with the first locking slider.

[0022] Furthermore, the second locking structure comprises:

[0023] A second locking bolt, which is disposed at a second end of the second mounting seat and is rotatably connected to the second mounting seat; and

[0024] A second locking slider, which is slidably connected to the cylinder;

[0025] Wherein, a second sliding hole is provided at the bottom of the material cylinder, and the threaded end of the second locking bolt passes through the second sliding hole and is threadedly connected with the second locking slider.

[0026] Furthermore, 82.5°≤α≤87.5°.

[0027] On the other hand, the utility model also provides an SLM device, comprising any one of the scraper assemblies described above.

[0028] Beneficial effects of the utility model:

[0029] The scraper assembly and SLM equipment provided by the utility model have an acute angle between the first blade body and the second blade body and the direction of movement of the scraper during the movement of the scraper. Therefore, the thrust of the scraper on the powder during the movement can offset most of the loss caused by the inertia of the powder, so that the powder supply at the north and south positions of the forming platform is sufficient, the powder waste is reduced, and the situation of opening the cabin to add powder is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0031] Figure 1 This is a schematic diagram of the operation when using a conventional scraper;

[0032] Figure 2 A three-dimensional view of a scraper assembly provided in the second embodiment of the utility model;

[0033] Figure 3 for Figure 2 The combined stereoscopic view of the scraper assembly and the material cylinder shown;

[0034] Figure 4 for Figure 3 A stereoscopic view in another direction shown;

[0035] Figure 5 for Figure 2 A partial cross-sectional view of the combination of the scraper assembly and the material cylinder;

[0036] Figure 6 A three-dimensional view of a scraper assembly provided in the first embodiment of the utility model;

[0037] Figure 7 for Figure 6 The combined stereoscopic view of the scraper assembly and the material cylinder shown;

[0038] Figure 8 The schematic diagram of the scraper assembly provided by the utility model is provided.

[0039] Reference numerals:

[0040] 100, material cylinder; 110, first slide hole; 120, second slide hole; 210, first tool body; 211, first strip groove; 220, second tool body; 221, second strip groove; 230, first mounting seat; 240, second mounting seat; 250, first bolt; 260, second bolt; 271, first locking bolt; 272, first locking slider; 281, second locking bolt; 282, second locking slider. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] like Figure 2-8As shown, the utility model provides a scraper assembly, including a scraper arranged on a material cylinder 100, the scraper includes a first blade body 210 and a second blade body 220, the bottoms of the first blade body 210 and the second blade body 220 are kept flush, the first end of the first blade body 210 and the first end of the second blade body 220 are connected, and the angle between the length direction of the first blade body 210 and the second blade body 220 and their own movement direction (i.e., the movement direction of the material cylinder 100) is α, wherein α is an acute angle. Specifically, the movement direction mentioned in this embodiment refers to the movement direction of the scraper when scraping powder.

[0048] When in use, during the movement of the scraper, since the first blade body 210 and the second blade body 220 form an acute angle with their own movement direction, the thrust of the scraper on the powder during movement can offset most of the loss caused by the inertia of the powder, so that the powder supply at the north and south positions of the forming platform is sufficient, reducing powder waste and avoiding the situation of opening the cabin to add powder.

[0049] Preferably, 82.5°≤α≤87.5°, because the larger α is, the smaller the effect of offsetting the loss of powder when the scraper moves, and the smaller α is, the longer the length of the first blade body 210 and the second blade body 220 is, and the longer the moving distance is. Usually, α=85°.

[0050] like Figure 7-8 As shown, in one embodiment, the first blade body 210 and the second blade body 220 are integrally formed, that is, the first blade body 210 and the second blade body 220 are integrally formed to form a complete scraper.

[0051] like Figure 2-3 As shown, in one embodiment, the first end of the first blade body 210 abuts against the first end of the second blade body 220, that is, the first blade body 210 and the second blade body 220 are two different entities.

[0052] like Figure 2-3 As shown, in one embodiment, the first end of the second blade body 220 extends a preset distance in the direction of the second end of the first blade body 210. Since the first blade body 210 and the second blade body 220 are two separate bodies, a powder line is likely to appear at the connection between the first blade body 210 and the second blade body 220 during the process of scraping powder. By extending the first end of the second blade body 220 in the direction of the second end of the first blade body 210 by a preset distance, the second blade body 220 will smooth the powder line during the process of scraping powder.

[0053] like Figure 2 and 5 As shown, in one embodiment, it further includes a first mounting seat 230, a second mounting seat 240, a first locking structure and a second locking structure.

[0054] The first end of the first mounting seat 230 is hinged to the cylinder 100, and the second end can swing back and forth between the first position and the second position around the hinge center line. The first end of the second mounting seat 240 is hinged to the cylinder 100, and the second end can swing back and forth between the third position and the third position around the hinge center line. The first locking structure is used to lock the first mounting seat 230. The second locking structure is used to lock the second mounting seat 240.

[0055] The first blade body 210 is provided with a plurality of first strip grooves 211, the length direction of the first strip grooves 211 is consistent with the length direction of the first blade body 210, a first bolt 250 is inserted into the first strip grooves 211, and the first bolt 250 is threadedly connected with the first mounting seat 230, so as to achieve the purpose of fixing the first blade body 210 on the first mounting seat 230. By providing the first strip grooves 211, the position of the first blade body 210 can be changed, so that when adjusting the angle between the first blade body 210 and its own movement direction, the position of the first blade body 210 can be changed so that the first blade body 210 always conflicts with the second blade body 220.

[0056] The second blade body 220 is disposed on the second mounting seat 240, and a plurality of second strip grooves 221 are disposed on the second blade body 220, the length direction of the second strip grooves 221 is consistent with the length direction of the second blade body 220, a second bolt 260 is inserted into the second strip groove 221, and the second bolt 260 is threadedly connected to the second mounting seat 240, thereby achieving the purpose of fixing the second blade body 220 on the second mounting seat 240. By providing the second strip grooves 221, the position of the second blade body 220 can be changed, so that when adjusting the angle between the second blade body 220 and its own movement direction, the position of the second blade body 220 can be changed so that the second blade body 220 always conflicts with the second blade body 220.

[0057] Specifically, when in use, the angle between the first blade body 210 and the second blade body 220 and their own movement direction is changed according to the fluidity of the powder currently used. Specifically, the first mounting seat 230 is unlocked by the first locking structure, the first mounting seat 230 is rotated, and after it is rotated to the target position, the first mounting seat 230 is locked by the first locking assembly. Similarly, the second mounting seat 240 is unlocked by the second locking structure, the second mounting seat 240 is rotated, and after it is rotated to the target position, the second mounting seat 240 is locked by the second locking assembly.

[0058] After the first mounting seat 230 and the second mounting seat 240 are fixed at the target position, the positions of the first blade body 210 and the second blade body 220 are adjusted so that the first end of the first blade body 210 is in conflict with the second blade body 220 .

[0059] The scraper assembly provided in this embodiment can adjust the angle between the first blade body 210 and the second blade body 220 and their own movement direction according to powders with different fluidities, and has higher adaptability.

[0060] like Figure 5 As shown, in one embodiment, the first locking structure includes a first locking bolt 271 and a first locking slider 272 .

[0061] The first locking bolt 271 is disposed at the second end of the first mounting seat 230 and is rotatably connected to the first mounting seat 230. The first locking slider 272 is disposed in the material cylinder 100 and is slidably connected to the material cylinder 100. A first sliding hole 110 is provided at the bottom of the material cylinder 100, and the threaded end of the first locking bolt 271 passes through the first sliding hole 110 and is threadedly connected to the first locking slider 272.

[0062] When in use, the first locking bolt 271 is loosened to unlock the first mounting seat 230. The first mounting seat 230 is rotated to drive the first locking slider 272 to move through the first locking bolt 271. When the first mounting seat 230 is rotated to the target position, the first locking bolt 271 is tightened to lock the first mounting seat 230. The structure is simple and the operation is convenient.

[0063] like Figure 5 As shown, in one embodiment, the second locking structure includes a second locking bolt 281 and a second locking slider 282 .

[0064] The second locking bolt 281 is disposed at the second end of the second mounting seat 240 and is rotatably connected to the second mounting seat 240. The second locking slider 282 is disposed in the material cylinder 100 and is slidably connected to the material cylinder 100. The bottom of the material cylinder 100 is provided with a second sliding hole 120, and the threaded end of the second locking bolt 281 passes through the second sliding hole 120 and is threadedly connected to the second locking slider 282.

[0065] When in use, the second locking bolt 281 is loosened to unlock the second mounting seat 240. The second mounting seat 240 is rotated to drive the second locking slider 282 to move through the second locking bolt 281. When the second mounting seat 240 is rotated to the target position, the second locking bolt 281 is tightened to lock the second mounting seat 240. The structure is simple and the operation is convenient.

[0066] In one embodiment, the utility model further provides an SLM device, comprising the scraper assembly described in any of the above embodiments.

[0067] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A scraper assembly, characterized in that: The invention comprises a scraper arranged on a material cylinder (100), wherein the scraper comprises a first blade body (210) and a second blade body (220), wherein the bottoms of the first blade body (210) and the second blade body (220) are kept flush, the first end of the first blade body (210) and the first end of the second blade body (220) are connected, and the angle between the length direction of the first blade body (210) and the second blade body (220) and their own movement direction is α, wherein α is an acute angle.

2. The scraper assembly according to claim 1, characterized in that: The first blade body (210) and the second blade body (220) are integrally formed.

3. The scraper assembly according to claim 1, characterized in that: The first end of the first blade body (210) abuts against the first end of the second blade body (220).

4. The scraper assembly according to claim 3, characterized in that: The first end of the second blade body (220) extends a preset distance in the direction of the second end of the first blade body (210).

5. The scraper assembly according to claim 1, 3 or 4, characterized in that: Also includes: A first mounting seat (230), a first end of which is hinged to the material cylinder (100) and a second end of which can swing back and forth between a first position and a second position around a hinge center line; A second mounting seat (240), a first end of which is hinged to the material cylinder (100), and a second end of which can swing back and forth between a third position and a first position around a hinge center line; A first locking structure, used for locking the first mounting seat (230); as well as A second locking structure, used for locking the second mounting seat (240); The first blade body (210) is provided with a plurality of first strip grooves (211), the length direction of the first strip grooves (211) is consistent with the length direction of the first blade body (210), a first bolt (250) is inserted into the first strip groove (211), and the first bolt (250) is threadedly connected to the first mounting seat (230); The second blade body (220) is arranged on the second mounting seat (240), and a plurality of second strip grooves (221) are arranged on the second blade body (220), the length direction of the second strip grooves (221) is consistent with the length direction of the second blade body (220), a second bolt (260) is inserted into the second strip groove (221), and the second bolt (260) is threadedly connected to the second mounting seat (240).

6. The scraper assembly according to claim 5, characterized in that: The first locking structure comprises: a first locking bolt (271), which is disposed at the second end of the first mounting seat (230) and is rotatably connected to the first mounting seat (230); and A first locking slider (272) slidably connected to the material cylinder (100); Wherein, a first sliding hole (110) is provided at the bottom of the material cylinder (100), and a threaded end of the first locking bolt (271) passes through the first sliding hole (110) and is threadedly connected to the first locking slider (272).

7. The scraper assembly according to claim 5, characterized in that: The second locking structure comprises: a second locking bolt (281), which is disposed at a second end of the second mounting seat (240) and is rotatably connected to the second mounting seat (240); and A second locking slider (282) slidably connected to the material cylinder (100); A second sliding hole (120) is provided at the bottom of the material cylinder (100), and a threaded end of the second locking bolt (281) passes through the second sliding hole (120) and is threadedly connected to the second locking slider (282).

8. The scraper assembly according to claim 1, 2, 3, 4, 6 or 7, characterized in that: 82.5°≤α≤87.5°。 9. A SLM device, characterized in that: The invention comprises the scraper assembly as described in any one of claims 1 to 8.

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