A bidirectional compaction mechanism

Abstract

The utility model discloses a kind of two-way compaction mechanisms, it is related to 3D printing technical field, the mechanism includes the horizontal reciprocating mechanism of being arranged on 3D printing equipment and the two groups of lifting mechanisms of interval setting in the execution end of horizontal reciprocating mechanism, the execution end of arbitrary lifting mechanism is provided with the first powder roller that can autorotate;The execution end of horizontal reciprocating mechanism is also provided with the second powder roller that can autorotate, the second powder roller is between two first powder rollers, the central axis of second powder roller and the central axis of two first powder rollers are parallel with the table top of the workbench of 3D printing equipment;The surface roughness value of arbitrary first powder roller is greater than the surface roughness value of second powder roller.When the powder layer laid on the workbench is compacted, one of the first powder rollers rises to a certain height, and the other first powder roller drops to a certain height, which can realize two-way powder laying and greatly improve the efficiency of adhesive jetting 3D printing.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and more specifically, to a bidirectional compaction mechanism. Background Technology

[0002] 3D printing technology (additive manufacturing technology) is an advanced manufacturing process that uses a three-dimensional digital model as a basis to build a three-dimensional solid by stacking materials layer by layer. Among the many branches of 3D printing technology, binder jet 3D printing technology is considered one of the technologies capable of achieving industrial mass production due to its advantages such as low cost and high efficiency. In the binder jet 3D printing process, a powder layer with a thickness of 5-200μm is uniformly laid in the forming chamber. Then, binder is jetted into a preset area through a micron-level precision nozzle. Through layer-by-layer bonding and curing, complex structural parts are formed without a mold. After curing at 200℃, a green part with a certain strength is formed. The green part is then debonded and sintered at high temperature to form the final part. In this process, the density of the green part is generally around 40%~60%, and the density of the sintered metal parts is approximately 96~99%.

[0003] In binder jet 3D printing equipment, the powder spreader's spreading roller plays a crucial role in leveling and compacting the powder. The surface treatment of the spreading roller directly affects the powder bed quality and forming accuracy. A spreading roller with a high surface roughness (rough roller) has a micro-protrusion structure that, through localized stress concentration, can increase the vertical pressure of the spreading roller on the powder surface to a certain extent, resulting in a green body density higher than the loose powder density. The localized uneven structure of the rough roller can also break up agglomerated powder particles, reducing interlayer defects caused by particle agglomeration. Furthermore, the forward thrust generated by the rough roller during rotation causes the powder at the front of the spreading roller to move along the spreading direction, thus homogenizing the powder surface. A spreading roller with a low surface roughness (smooth roller) has a nano-polished surface, which can directly compact the leveled powder surface, further improving the green body density. Generally, along the spreading direction, the rough roller is located in front of the smooth roller, and the lowest point of the rough roller is higher than that of the smooth roller. The high-speed rotating rough roller first evens out and flattens the powder, and then initially compacts the powder surface. The smooth roller behind it further compacts the powder surface by high-speed rotation and extrusion, thereby increasing the density of the green body.

[0004] In the process of adhesive jetting 3D printing, if there is only one rough roller and one smooth roller, powder can only be spread in one direction. The return stroke of the powder spreader cannot spread powder, which greatly reduces the powder spreading efficiency and thus reduces the efficiency of adhesive jetting 3D printing. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bidirectional compaction mechanism.

[0006] The objective of this utility model is achieved through the following technical solution: A bidirectional compaction mechanism includes a horizontal reciprocating moving mechanism disposed on a 3D printing equipment and two sets of lifting mechanisms spaced apart at the execution end of the horizontal reciprocating moving mechanism. Each of the lifting mechanisms has a self-rotating first powder-spreading roller at its execution end. The horizontal reciprocating moving mechanism also has a self-rotating second powder-spreading roller at its execution end, located between the two first powder-spreading rollers. The central axis of the second powder-spreading roller and the central axes of the two first powder-spreading rollers are parallel to the table surface of the 3D printing equipment. The surface roughness value of any of the first powder-spreading rollers is greater than that of the second powder-spreading roller.

[0007] Furthermore, in this utility model, the aforementioned horizontal reciprocating moving mechanism is a screw and nut mechanism, with a top plate provided on the nut, and both sets of the aforementioned lifting mechanisms and the aforementioned second powder spreading roller are all provided on the aforementioned top plate.

[0008] Furthermore, in this utility model, any of the above-mentioned lifting mechanisms is a hydraulic rod installed on the top plate, the extension and retraction direction of the hydraulic rod is parallel to the vertical direction, and the first powder spreading roller is rotatably connected to the actuating end of the hydraulic rod.

[0009] Furthermore, in this utility model, the actuator end of the hydraulic rod is provided with a bracket, and both ends of the first powder spreading roller are rotatably connected to the bracket.

[0010] Furthermore, in this utility model, a motor is provided on the support, and the motor is connected to the first powder spreading roller in a transmission connection.

[0011] Furthermore, in this invention, the central axis of the second powder spreading roller is parallel to the central axes of the two first powder spreading rollers.

[0012] The beneficial effects of this utility model are: This utility model provides a bidirectional compaction mechanism. By installing two sets of lifting mechanisms and a second powder spreading roller at the execution end of a horizontal reciprocating moving mechanism, and installing a self-rotating first powder spreading roller at the execution end of any lifting mechanism, when compacting the powder layer laid on the worktable, one of the first powder spreading rollers rises to a certain height and the other first powder spreading roller descends to a certain height, which can achieve bidirectional powder spreading and greatly improve the efficiency of adhesive jet 3D printing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the installation structure of the first powder spreading roller in an embodiment of the present invention.

[0014] In the diagram: 101-Horizontal reciprocating moving mechanism; 201-Lifting mechanism; 301-First powder spreading roller; 401-Second powder spreading roller; 501-Top plate; 601-Support; 701-Motor; 801-Worktable. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 and Figure 2 This utility model provides a technical solution: A bidirectional compaction mechanism includes a horizontal reciprocating moving mechanism 101 installed on a 3D printing equipment and two sets of lifting mechanisms 201 spaced apart at the execution end of the horizontal reciprocating moving mechanism 101. The reciprocating movement direction of the execution end of the horizontal reciprocating moving mechanism 101 is horizontal. A first powder spreading roller 301 that can rotate is installed at the execution end of any lifting mechanism 201. A second powder spreading roller 401 that can rotate is also installed at the execution end of the horizontal reciprocating moving mechanism 101. The second powder spreading roller 401 is located between the two first powder spreading rollers 301. The central axis of the second powder spreading roller 401 and the central axis of the two first powder spreading rollers 301 are parallel to the table surface of the worktable 801 of the 3D printing equipment. The surface roughness values ​​of the two first powder spreading rollers 301 are greater than the surface roughness value of the second powder spreading roller 401.

[0017] Preferably, in this embodiment, the horizontal reciprocating movement mechanism 101 is a lead screw and nut mechanism. To facilitate the installation of the two sets of lifting mechanisms 201 and the second powder spreading roller 401, a top plate 501 is mounted on the nut of the lead screw and nut mechanism, and both sets of lifting mechanisms 201 and the second powder spreading roller 401 are mounted on the top plate 501. In other embodiments of this embodiment, the horizontal reciprocating movement mechanism 101 may be replaced by other mechanisms capable of linear reciprocating movement, such as a linear motor.

[0018] Preferably, in this embodiment, any lifting mechanism 201 is a hydraulic rod installed on the top plate 501, the extension and retraction direction of the hydraulic rod is parallel to the vertical direction, and the first powder spreading roller 301 is rotatably connected to the actuating end of the hydraulic rod.

[0019] To facilitate the installation of the first powder spreading roller 301, in this embodiment, a bracket 601 is installed at the actuating end of any hydraulic rod, and both ends of the first powder spreading roller 301 are rotatably connected to the bracket 601.

[0020] To facilitate the rotation of the first powder spreading roller 301 during the leveling process, in this embodiment, motors 701 are installed on both supports 601, and the two motors 701 are respectively connected to the two first powder spreading rollers 301. One end of the second powder spreading roller 401 is also connected to a motor 701 to facilitate the rotation of the second powder spreading roller 401 during powder spreading and pressing.

[0021] During installation, the central axis of the second powder spreading roller 401 should be parallel to the central axes of the two first powder spreading rollers 301.

[0022] Working principle: This technical solution adopts a three-roller powder spreading technology. The second powder spreading roller 401 in the middle is a smooth roller (with a small surface roughness value). Two first powder spreading rollers 301 (rough rollers with a surface roughness value greater than that of the smooth roller) are installed on both sides of the second powder spreading roller 401.

[0023] from Figure 1 From the perspective of the horizontal reciprocating moving mechanism 101, when the actuator moves to the right, the first powder-spreading roller 301 on the right descends to a certain height, and the first powder-spreading roller 301 on the left rises to a certain height, achieving powder spreading and compaction in the current direction of movement. The first powder-spreading roller 301 on the left will not damage the already powder-spreading surface. During this process, the second powder-spreading roller 401 and the first powder-spreading roller 301 on the right cooperate to compact the powder surface. When the actuator moves to the left, the first powder-spreading roller 301 on the right rises to a certain height, and the first powder-spreading roller 301 on the left descends to a certain height, achieving powder spreading in the return direction. Again, the first powder-spreading roller 301 on the right will not damage the already powder-spreading surface. During this process, the second powder-spreading roller 401 and the first powder-spreading roller 301 on the left cooperate to compact the powder surface. This allows for bidirectional powder spreading, significantly improving the efficiency of adhesive jet 3D printing.

[0024] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A bidirectional compaction mechanism, characterized in that: The device includes a horizontal reciprocating moving mechanism (101) installed on the 3D printing equipment and two sets of lifting mechanisms (201) spaced apart at the execution end of the horizontal reciprocating moving mechanism (101). The execution end of any of the lifting mechanisms (201) is provided with a first powder spreading roller (301) that can rotate on its own. The execution end of the horizontal reciprocating moving mechanism (101) is also provided with a second powder spreading roller (401) that can rotate on its own. The second powder spreading roller (401) is located between the two first powder spreading rollers (301). The central axis of the second powder spreading roller (401) and the central axis of the two first powder spreading rollers (301) are both parallel to the table surface of the worktable (801) of the 3D printing equipment. The surface roughness value of any first powder spreading roller (301) is greater than the surface roughness value of the second powder spreading roller (401).

2. The bidirectional compaction mechanism according to claim 1, characterized in that: The horizontal reciprocating moving mechanism (101) is a screw and nut mechanism, with a top plate (501) provided on the nut. The two sets of lifting mechanisms (201) and the second powder spreading roller (401) are all provided on the top plate (501).

3. The bidirectional compaction mechanism according to claim 2, characterized in that: Any of the lifting mechanisms (201) is a hydraulic rod installed on the top plate (501), the extension and retraction direction of the hydraulic rod is parallel to the vertical direction, and the first powder spreading roller (301) is rotatably connected to the actuating end of the hydraulic rod.

4. The bidirectional compaction mechanism according to claim 3, characterized in that: The hydraulic rod is provided with a bracket (601) at its actuating end, and the two ends of the first powder spreading roller (301) are rotatably connected to the bracket (601).

5. A bidirectional compaction mechanism according to claim 4, characterized in that: A motor (701) is provided on the support (601), and the motor (701) is connected to the first powder spreading roller (301) for transmission.

6. The bidirectional compaction mechanism according to claim 1, characterized in that: The central axis of the second powder spreading roller (401) is parallel to the central axis of the two first powder spreading rollers (301).

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