Flexible scraper and leveling device
By designing flexible scrapers and leveling devices for multiple powder laying parts, the problems of easy damage, high cost and short service life of traditional scrapers are solved, and higher powder laying quality and service life are achieved.
Patent Information
- Application Number
- CN202421249817.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-03
AI Technical Summary
Traditional scrapers are easily damaged during powder laying, and the cost is high. The conventional rubber scrapers contaminate the forming chamber after wear, and the wear and out of the gap leads to uneven powder laying surface, short service life, and are prone to twisting and deforming during installation.
A flexible scraper is designed, which includes a columnar body and a plurality of powder laying parts arranged in the side wall along the axial direction of the columnar body. There are at least three powder laying parts, which can be used multiple times during the powder laying process, and ensure that the bottom of the scraper is flattened by a leveling device.
The service life of the flexible scraper is extended, the quality and flatness of powder laying are improved, and the manufacturing cost is reduced. Through the design of multiple powder laying parts, multiple powder laying and compacting are achieved, and the defects after wear are overcome.
Smart Images
Figure CN222740311U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of additive manufacturing, and relates to a flexible scraper and a leveling device, in particular to a rubber scraper and a leveling device for metal additive manufacturing. Background Art
[0002] The scraper needs to make long-term reciprocating motions during the powder spreading process. Traditional scrapers will directly contact and rub against the powder and sintered surface on the platform. Since traditional scrapers are basically steel scrapers, they have a large force on the forming surface of the part, which can easily damage the part and are also expensive. Flexible scrapers made of rubber materials have less force on the forming surface of the part, but conventional rubber scrapers are more prone to wear. The worn material will contaminate the metal powder in the forming chamber, and scrapers with notches will cause the powder spreading surface to be uneven. Therefore, the use of rubber scrapers requires regular maintenance and replacement. At the same time, conventional rubber scrapers have only one powder spreading part, and are easily twisted and deformed during installation, resulting in an uneven surface under the scraper, affecting the quality of powder spreading. Utility Model Content
[0003] In order to solve the above technical problems existing in the background technology, the utility model provides a flexible scraper and a leveling device which have a long service life and can improve the powder spreading quality.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A flexible scraper, characterized in that: the flexible scraper comprises a columnar body and a powder spreading portion arranged on the side wall of the columnar body along the axial direction of the columnar body; the number of the powder spreading portions is at least three.
[0006] The powder spreading parts are evenly distributed on the side wall of the columnar body, or unevenly distributed on the side wall of the columnar body.
[0007] The powder spreading part and the columnar body are an integrated structure or a split structure.
[0008] The cross section of the flexible scraper is generally trident-shaped, X-shaped or star-shaped.
[0009] The end section of the powder spreading part is a sharp angle, a curved surface or a spherical surface.
[0010] The structure of each of the multiple powder spreading locations is the same or different.
[0011] A leveling device for clamping the flexible scraper as described above, characterized in that: the leveling device includes a first mounting plate and a second mounting plate; the cross-section of the second mounting plate is L-shaped; the first mounting plate is placed on the top of the second mounting plate and forms a mounting groove with the second mounting plate; the flexible scraper to be assembled is placed in the mounting groove along the axial direction of the second mounting plate.
[0012] The installation groove has at least one working surface parallel to the horizontal plane; any two powder spreading parts of the flexible scraper to be assembled are placed on the working surface.
[0013] The flexible scraper flattening device further comprises clamping devices arranged on both sides of the flexible scraper to be assembled.
[0014] The clamping device comprises a first pressing plate and a second pressing plate, and the first pressing plate and the second pressing plate are arranged in parallel on both sides of the flexible scraper to be assembled.
[0015] The advantages of the utility model are:
[0016] The utility model provides a flexible scraper, including a columnar body and a powder spreading part arranged on the side wall of the columnar body along the axial direction of the columnar body; there are at least three powder spreading parts. The flexible scraper provided by the utility model has multiple powder spreading parts, and two powder spreading parts are used at the same time, so that powder spreading or compaction can be achieved twice during the powder spreading process, ensuring the powder spreading quality. At the same time, after one side is worn, it can be rotated to a certain angle and used again, thereby increasing the service life of the rubber scraper. Compared with scrapers made of other materials, it is cheaper and greatly reduces the manufacturing cost. The flattening device provided by the utility model flattens the deformation and distortion of the bottom of the rubber scraper caused by the rubber scraper pressure plate, thereby improving the powder spreading flatness and further ensuring the forming quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the use state of the leveling device provided by the utility model;
[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the flexible scraper (X-shaped) provided by the utility model;
[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the flexible scraper (X1 type) provided by the utility model;
[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the flexible scraper (X2 type) provided by the utility model;
[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the flexible scraper (X3 type) provided by the utility model;
[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the flexible scraper (trident-1 type) provided by the utility model;
[0023] Figure 7 This is a schematic diagram of the cross-sectional structure of the flexible scraper (trident-2 type) provided by the utility model;
[0024] Figure 8 It is a schematic diagram of the cross-sectional structure of the flexible scraper (star-shaped) provided by the utility model;
[0025] in:
[0026] 1-first mounting plate; 2-second mounting plate; 3-first pressing plate; 4-second pressing plate; 5-X-shaped rubber scraper; 6-powder spreading area. DETAILED DESCRIPTION
[0027] See also Figure 2-Figure 8 The utility model provides a flexible scraper, comprising a columnar body and a powder spreading portion 6 arranged on the side wall of the columnar body along the axial direction of the columnar body; there are at least three powder spreading portions 6. The plurality of powder spreading portions 6 can be evenly distributed on the side wall of the columnar body, such as Figures 2 to 8 ; It can also be arranged on the side wall of the columnar body in a non-uniform manner. For example, in the X-type rubber scraper, one set of diagonals is 70° and the other set of diagonals is 110°. It should be noted that no matter whether the powder spreading part 6 is evenly divided or not, since the distance from the center of the columnar body to the end of the powder spreading part is equal, it can be considered that any two adjacent powder spreading parts can be in the same horizontal plane. Exemplarily, the material of the flexible scraper provided by the utility model can be rubber, silicone or other conventional materials suitable for scrapers, which will not be repeated here. Exemplarily, the powder spreading part 6 and the columnar body can be an integrated structure or a split structure. For example, the powder spreading part 6 can be directly inserted into the columnar body by plug-in. For another example, the powder spreading part 6 is integrated with the columnar body, but the central area is considered to be the columnar body. For another example, for the X-type scraper, two rod-shaped scraper components containing two powder spreading parts can also be cross-fixed to form an X-type scraper. At this time, the connection area of the two rod-shaped scraper components can be considered to be the columnar body.
[0028] The flexible scraper provided by the utility model comprises a plurality of flexible powder spreading parts, two of which work at the same time, and when working at the same time, the two powder spreading parts need to be on the same horizontal plane. Figure 2 The working method of the utility model is described in detail by taking the X-shaped flexible scraper as an example: the X-shaped flexible scraper includes four powder spreading parts 6, which are the first powder spreading part (lower right), the second powder spreading part (lower left), the third powder spreading part (upper left) and the fourth powder spreading part (upper right) in a clockwise direction, starting from the powder spreading part 6 on the far right of the X-shaped flexible scraper. Figure 2 The direction from left to right is the advancing direction of the flexible scraper.
[0029] When the two powder spreading parts are working at the same time, the first powder spreading part and the second powder spreading part are both placed on the powder spreading work surface, and the powder spreading work is about to start. The first powder spreading part contacts the powder first, and since there is a certain interval between the first powder spreading part and the second powder spreading part, the second powder spreading part contacts the powder later. Generally speaking, the first powder spreading part contacts the powder and then the second powder spreading part compacts the area after the first powder spreading part has worked.
[0030] Once the first powder-spreading part is worn or contaminated, and the second powder-spreading part reaches the defective powder-spreading area (the powder-spreading area is defective due to the wear or contamination of the first powder-spreading part, such as there are protrusions in the powder-spreading area (the first powder-spreading part is worn) or there are grooves in the powder-spreading area (the first powder-spreading part is contaminated or powder is attached)), the second powder-spreading part will continue to spread powder on the defective powder-spreading area to overcome the defects of the powder-spreading area. In another embodiment, after completing the powder-spreading work of the current layer, the flexible scraper can be disassembled, and the flexible scraper can be rotated 90° so that the second and third powder-spreading parts are used as new powder-spreading parts. The flexible scraper can also be rotated 180° so that the third and fourth powder-spreading parts are used as new powder-spreading parts. After determining the new powder-spreading part, the scraper is re-flattened by the scraper flattening device and then installed on the scraper holder to facilitate subsequent powder-spreading operations. Until the third powder-spreading part is worn or contaminated, the flexible scraper provided by the utility model is replaced as a whole. The advantage of using two powder spreading parts working at the same time is that the powder can be leveled and compacted twice during the powder spreading process, which greatly improves the powder spreading quality and ensures the powder spreading flatness.
[0031] Exemplarily, when two powdering parts are working at the same time, as mentioned above, since the first powdering part is worn or contaminated, after removing the flexible scraper, the third powdering part and the second powdering part are used as new powdering parts (that is, the second powdering part is a backup or substitute of the first powdering part, directly serving as the first powdering part; the third powdering part is a backup or substitute of the second powdering part, directly serving as the second powdering part) to start a new round of powdering work and avoid waste of the second powdering part.
[0032] See also Figures 2 to 8 The cross section of the flexible scraper provided by the utility model is a trident shape as a whole ( Figure 6 The trident-1 type shown and Figure 7 The three-pronged type-2 shown), X-type ( Figure 2 The X-shaped structure shown, Figure 3 The X1 structure shown, Figure 4 The X2-type structure shown and Figure 5 X3 structure shown) or star structure (such as Figure 8 The five-pointed star structure shown).
[0033] The end section of the powder spreading part 6 is a sharp angle, a curved surface or a spherical surface. Figure 2 The X-shaped structure shown is Figure 3 Compared with the X1-type structure shown, the powder spreading part 6 of the X1-type structure is fuller than that of the X-type structure, but both are spherical in shape and are more slender than the X-type structure. Therefore, the X1-type structure has better flexibility. Figure 2 The X-shaped structure shown is Figure 4 Compared with the X2-type structure shown, the circular shape of the powder spreading part 6 of the X2-type structure is changed to a rectangular shape, thereby improving the powder spreading quality and surface flatness. Figure 2 The X-shaped structure shown is Figure 5 Compared with the X3 type structure shown in the figure, the powder spreading part 6 of the X3 type structure has a smaller contact surface with the powder and is similar to a blade shape, which prevents the powder from sticking to the rubber powder spreading part after the contact surface with the powder is large, resulting in uneven powder spreading, thereby improving the part forming quality.
[0034] The structure of each of the multiple powder spreading parts 6 is the same or different. Regardless of whether the structure of the powder spreading parts is the same or different, the distance from the center of the columnar body to the end of the powder spreading part is equal, that is, two adjacent powder spreading parts 6 are in the same horizontal plane. Figure 7 In the trident-2 type structure shown, the cross-section of one of the powder-spreading parts (lower right) is a sharp-angle structure, and the cross-section adjacent to the powder-spreading part (lower left) is a spherical structure. However, no matter which structure it is, the lower end of the powder-spreading part on the lower right and the lower end of the powder-spreading part on the lower left are in the same plane.
[0035] See also Figure 1 The utility model also provides a leveling device for clamping the above-mentioned flexible scraper, including a first mounting plate 1 and a second mounting plate 2; the cross-section of the second mounting plate 2 is L-shaped; the first mounting plate 1 is placed on the top of the second mounting plate 2 and forms a mounting groove with the second mounting plate 2; the flexible scraper to be assembled is placed in the mounting groove along the axial direction of the second mounting plate 2.
[0036] In order to ensure that the powder spreading part 6 of the flexible scraper can better fit the powder spreading work surface, the installation groove adopted by the utility model has at least one working surface parallel to the horizontal plane; any two powder spreading parts 6 of the flexible scraper to be assembled are in contact with the working surface. In addition, the flattening device of the flexible scraper also includes a clamping device arranged on both sides of the flexible scraper to be assembled. Exemplarily, the clamping device may include a first pressing plate 3 and a second pressing plate 4, and the first pressing plate 3 and the second pressing plate 4 are arranged in parallel on both sides of the flexible scraper to be assembled. The structure of the first pressing plate 3 and the structure of the second pressing plate 4 can be the same or different, as long as the two can clamp the flexible scraper to be assembled to form an integral structure.
[0037] Taking the flexible scraper to be assembled as an X-shaped rubber scraper as an example, when assembling the X-shaped rubber scraper 5, the first mounting plate 1 and the second mounting plate 2 form a leveling device, and the first pressing plate 3 and the second pressing plate 4 are connected as a clamping device of the X-shaped rubber 5.
[0038] The leveling device provided by the utility model is as follows: Figure 1 As shown, when in use, first connect the first mounting plate 1 and the second mounting plate 2 by screws to form a leveling device containing a mounting groove, then put the second pressing plate 4 into the leveling device containing the mounting groove, then put the X-shaped rubber scraper 5 into the leveling device along the horizontal surface of the mounting groove and close to the already placed pressing plate, then put the first pressing plate 3 into the mounting groove and clamp the scraper by screws and the second pressing plate 4 to form a clamping device. At this time, since the two powder-laying parts of the X-shaped rubber scraper are close to the horizontal surface of the mounting groove, it can be considered that the scraper has been leveled. After that, loosen the screws of the first mounting plate 1, and take out the rubber scraper composed of the first pressing plate 3, the second pressing plate 4 and the X-shaped rubber scraper 5 as a whole. At this time, since the powder-laying surface at the bottom of the X-shaped rubber scraper is already flat, it can be directly installed in the equipment as a whole for use. When it is necessary to replace or adjust the powder-laying part, the leveling device provided by the utility model is used again, and after repeating the above steps, the X-shaped rubber scraper is leveled again.
Claims
1. A flexible scraper, characterized in that: The flexible scraper comprises a columnar body and a powder spreading portion (6) arranged on the side wall of the columnar body along the axial direction of the columnar body; the number of the powder spreading portions (6) is at least three; The powder spreading parts (6) are evenly distributed on the side wall of the columnar body or unevenly distributed on the side wall of the columnar body.
2. The flexible scraper according to claim 1, characterized in that: The powder spreading part (6) and the columnar body are an integrated structure or a split structure.
3. The flexible scraper according to claim 2, characterized in that: The cross section of the flexible scraper is generally trident-shaped, X-shaped or star-shaped.
4. The flexible scraper according to claim 1, 2 or 3, characterized in that: The end section of the powder spreading part (6) is a sharp angle, a curved surface or a spherical surface.
5. The flexible scraper according to claim 4, characterized in that: The structure of each powder spreading location in the plurality of powder spreading locations (6) is the same or different.
6. A flexible scraper leveling device, characterized in that: The flexible scraper flattening device comprises a first mounting plate (1) and a second mounting plate (2); the second mounting plate (2) has an L-shaped cross section; the first mounting plate (1) is placed on top of the second mounting plate (2) and forms a mounting groove with the second mounting plate (2); The flexible scraper as described in any one of claims 1 to 5 is placed in the mounting groove along the axial direction of the second mounting plate (2).
7. The flexible scraper flattening device according to claim 6, characterized in that: The installation groove has at least one working surface parallel to the horizontal plane; any two powder spreading parts (6) of the flexible scraper are placed on the working surface.
8. The flexible scraper flattening device according to claim 6 or 7, characterized in that: The flexible scraper flattening device further comprises clamping devices arranged on both sides of the flexible scraper.
9. The flexible scraper flattening device according to claim 8, characterized in that: The clamping device comprises a first pressing plate (3) and a second pressing plate (4), wherein the first pressing plate (3) and the second pressing plate (4) are arranged in parallel on both sides of the flexible scraper.