Stirring part, stirring assembly and stirring friction additive device

Abstract

The utility model relates to the technical field of friction stir additive materials, in particular to a stirring piece, a stirring assembly and a friction stir additive device, which comprise a stirring body, a discharging channel and a stirring needle, the stirring body is configured to be rotatable, and the stirring body comprises a first plane and a second plane which are oppositely arranged along the axial direction of a rotating shaft of the stirring body; the discharging channel penetrates through the stirring body in the axial direction of a rotating shaft of the stirring body, the discharging channel comprises a first orifice located in a first plane and a second orifice located in a second plane, and the first orifice is eccentrically arranged relative to the rotating shaft of the stirring body; the stirring needle is arranged on the first plane and comprises at least one stirring part, the stirring parts are arranged on the outer side of the first hole, and when the multiple stirring parts are arranged, the multiple stirring parts are arranged around the first hole. The device can improve the stirring friction additive material efficiency and ensure the high quality of finished products.

Description

Technical Field

[0001] The utility model relates to the technical field of friction stir additive manufacturing, in particular to a stirring member, a stirring assembly and a friction stir additive manufacturing device. Background Art

[0002] Additive manufacturing, also known as 3D printing, has become an important process in product manufacturing due to its high flexibility, unlimited customization ability, and the ability to quickly respond to complex geometries. It is widely used in the fields of automotive, marine, aerospace, and military. In recent years, friction stir additive manufacturing, a new branch of metal additive manufacturing that has developed rapidly based on the principle of friction stir welding, has gradually become known in the market. It uses a high-speed rotating stirring head to extrude metal, introduce raw materials at the same time, and cause significant plastic deformation in the material in the stirring area to adhere to the substrate. This process does not involve any melting, and solid-phase connection is achieved under the extrusion of the shoulder of the stirring head. Compared with other metal additive manufacturing technologies, it has less heat input and greater working area pressure, which can effectively weaken problems such as pores, hot cracks, residual stress, and alloy element burning loss, and has broad application prospects in the additive field of large components of light alloys such as aluminum alloys and magnesium alloys.

[0003] According to the shape of the material used in additive manufacturing, it can be divided into rod materials, wire materials, and powder materials. Compared with rod materials and wire materials, due to the wider adjustable range of powder material properties, using it to manufacture structural parts has a broader application space in terms of performance. In the prior art, when using powder materials for additive manufacturing, the powder is mainly provided with a force through a top rod or a spiral groove, and a stirring head with a stirring pin is used to stir the molten layer to make the powder combine with the substrate to achieve additive manufacturing.

[0004] However, when facing some high-melting-point materials, such as powder materials of iron-based alloys, titanium alloys, nickel-based alloys, etc. for friction stir additive manufacturing, the existing stirring heads are difficult to meet the production requirements, and there are problems of low friction and stirring efficiency, which affect the quality of the finished product. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the low friction and stirring efficiency of the existing stirring head and the influence on the quality of the finished product, and provide a stirring member, a stirring assembly and a friction stir additive manufacturing device, which can improve the friction stir additive manufacturing efficiency and ensure high-quality finished products.

[0006] In a first aspect, the present utility model provides a stirring member, including a stirring body configured to be rotatable. The stirring body includes a first plane and a second plane disposed opposite to each other along the axial direction of its rotation axis. An outlet channel that penetrates the stirring body along the axial direction of the rotation axis of the stirring body. The outlet channel includes a first orifice located in the first plane and a second orifice located in the second plane. The first orifice is eccentrically disposed relative to the rotation axis of the stirring body. And stirring pins disposed on the first plane. The stirring pins include at least one stirring portion, and the stirring portion is disposed outside the first orifice. When there are multiple stirring portions, the multiple stirring portions are arranged around the first orifice.

[0007] In an embodiment of the present utility model, the stirring pins include multiple stirring portions, and the multiple stirring portions are all arranged in an arc-shaped structure. The multiple stirring portions are evenly spaced in the circumferential direction around the center of the first orifice.

[0008] In an embodiment of the present utility model, the eccentric distance H of the first orifice satisfies the relational expression: 0.5 mm ≤ H ≤ 1.5 mm.

[0009] In an embodiment of the present utility model, the second orifice is concentrically arranged with the rotation axis.

[0010] In an embodiment of the present utility model, the inner wall of the outlet channel is inclined, and the aperture of the first orifice is not greater than the aperture of the second orifice.

[0011] In a second aspect, the present utility model further provides a stirring assembly, including a first stirring shaft body, a second stirring shaft body, and the stirring member according to any one of the above. The second stirring shaft body is hollow along its own axis. The second stirring shaft body is sleeved outside the first stirring shaft body. A first material channel is formed between the inner wall of the second stirring shaft body and the outer wall of the first stirring shaft body. A spiral member is provided on the inner wall of the second stirring shaft body. The second plane of the stirring body is connected to an axial end of the second stirring shaft body, and the outlet channel communicates with the first material channel.

[0012] In an embodiment of the present utility model, it further includes a heat insulation member. The heat insulation member is respectively connected to the second plane of the stirring body and an axial end of the second stirring shaft body. A second material channel is provided on the heat insulation member, and the second material channel communicates with the outlet channel and the first material channel respectively.

[0013] In an embodiment of the present utility model, the first stirring shaft body is hollow along its own axis to form a laser channel for the laser to pass through.

[0014] In an embodiment of the present utility model, the inner wall of the second stirring shaft body is inclined at one end close to the stirring member, so that the radial dimension of the first material channel gradually decreases from one end thereof to the end connected to the stirring member.

[0015] In a third aspect, the present utility model further provides a friction stir additive manufacturing device, including the stirring assembly described in any one of the above.

[0016] The above technical solution of the present utility model has the following beneficial effects compared with the prior art:

[0017] For the stirring member of the present utility model, by providing an eccentric first orifice and a stirring needle, during use, the powder material is evenly and efficiently plasticized and extruded to the stacking layer. By performing friction stir additive manufacturing with this stirring member, the material uniformity can be improved, air bubbles can be eliminated, so as to enhance the material interface bonding strength and improve the material performance; at the same time, the friction stir efficiency can also be effectively improved to achieve high-efficiency additive manufacturing. It is particularly suitable for friction stir additive manufacturing of metals such as iron-based alloys and nickel-based alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model and in combination with the accompanying drawings, wherein,

[0019] Figure 1 is a schematic structural diagram of the first perspective of the stirring member in the preferred embodiment of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the second perspective of the stirring member in the preferred embodiment of the present utility model;

[0021] Figure 3 is a schematic cross-sectional structural diagram of the stirring member in the preferred embodiment of the present utility model;

[0022] Figure 4 is a schematic structural diagram of the third perspective of the stirring member in the preferred embodiment of the present utility model;

[0023] Figure 5 is a schematic cross-sectional structural diagram of the stirring assembly in the preferred embodiment of the present utility model.

[0024] Description of the reference numerals in the drawings: 10, stirring body; 11, rotating shaft; 12, first plane; 13, second plane; 14, connecting part; 20, discharge channel; 21, first orifice; 211, eccentric shaft; 22, second orifice; 30, stirring needle; 31, stirring part; 40, first stirring shaft body; 41, laser channel; 42, heat insulation member; 50, second stirring shaft body; 51, spiral member; 52, heat insulation component; 60, first material channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited are not intended to limit the present utility model.

[0026] Referring to Figure 1 、 Figure 2 and Figure 3 as shown, the present utility model discloses a stirring member, which includes a stirring body 10, and a discharge channel 20 and stirring pins 30 are provided on the stirring body 10.

[0027] Specifically, the stirring body 10 is configured to be rotatable to stir and friction the corresponding powder materials to achieve additive manufacturing. Those skilled in the art can set the specific rotation mode according to actual needs, for example, driving through a motor, etc., which will not be elaborated here. The stirring body 10 includes a first plane 12 and a second plane 13 that are oppositely arranged along the axial direction of its rotation axis 11. Among them, the first plane 12 is the surface closer to the base material during friction stir additive manufacturing.

[0028] The discharge channel 20 is used for the powder materials to pass through; in some embodiments, the discharge channel 20 can also allow things other than the powder materials to pass through. For example, a laser can be used to assist in softening the powder materials to achieve friction stir. Specifically, the discharge channel 20 penetrates the stirring body 10 along the axial direction of the rotation axis 11 of the stirring body 10. The discharge channel 20 includes a first orifice 21 located on the first plane 12 and a second orifice 22 located on the second plane 13. Among them, the first orifice 21 is eccentrically arranged relative to the rotation axis 11 of the stirring body 10. By setting this structure, the powder materials are not located at the center during discharge, which can cooperate with the stirring pins 30 to achieve uniform friction stir additive manufacturing, help eliminate bubbles, and improve the quality of the finished product; at the same time, it can also improve the friction stir efficiency for more efficient additive manufacturing. In Figure 3 , the position where the first orifice 21 is eccentrically arranged is indicated by an eccentric shaft 211 parallel to the rotation axis 11.

[0029] The stirring needle 30 is used to stir the molten layer, increase the fluidity of the solution, promote the overflow of bubbles in the deposition layer, and accelerate the diffusion and fusion of elements. In addition to the frictional heat effect, the stirring needle 30 also generates a stirring effect, which can improve the fiber distribution, enhance the interfacial bonding strength of the material, and improve the performance of the composite material. Specifically, the stirring needle 30 is arranged on the first plane 12. The stirring needle 30 includes at least one stirring part 31, and the stirring part 31 is arranged outside the first orifice 21. It should be noted that the outside of the first orifice 21 here is referenced by the edge of the first orifice 21. When there are multiple stirring parts 31, the multiple stirring parts 31 are arranged around the first orifice 21. By setting this structure, the stirring part 31 eccentric to the relative rotation axis 11 not only has a rotational motion but also has a certain revolution motion. Cooperating with the first orifice 21, it can effectively improve the efficiency of friction stirring and perform additive manufacturing more efficiently. Regarding the structure of the stirring part 31, those skilled in the art can set it according to actual needs.

[0030] During use, the powder material exits from the discharge channel 20. Under the action of the rotating stirring body 10 and the corresponding stirring part 31, the powder material is uniformly and efficiently plasticized and extruded to the stacking layer. During the additive manufacturing process, the first orifice 21 eccentric to the relative rotation axis 11 can ensure that the powder material does not exit at the center of the stirring body 10 when discharging. At the same time, the stirring part 31 that has both a rotational motion and a revolution motion can stir and friction the powder material, which can not only improve the material uniformity, eliminate bubbles, enhance the interfacial bonding strength of the material and improve the material performance, but also effectively improve the stirring and friction efficiency and achieve efficient additive manufacturing. It is particularly suitable for friction stir additive manufacturing of metals such as iron-based alloys and nickel-based alloys.

[0031] For the stirring part of the present utility model, by setting the eccentric first orifice 21 and the stirring needle 30, during use, the powder material is uniformly and efficiently plasticized and extruded to the stacking layer. By performing friction stir additive manufacturing with this stirring part, it can improve the material uniformity, eliminate bubbles, enhance the interfacial bonding strength of the material and improve the material performance; at the same time, it can also effectively improve the stirring and friction efficiency and achieve efficient additive manufacturing. It is particularly suitable for friction stir additive manufacturing of metals such as iron-based alloys and nickel-based alloys.

[0032] Refer to Figure 1 and Figure 4 As shown, for the stirring part of the present utility model, in some embodiments, the stirring needle 30 includes multiple stirring parts 31. The multiple stirring parts 31 are all arranged in an arc-shaped structure. Specifically, the arc-shaped stirring part 31 includes a first end and a second end. The first end is arranged close to the center of the first orifice 21, the second end is arranged far from the center of the first orifice 21, and the middle part of the stirring part 31 between the first end and the second end extends in an arc shape. The multiple stirring parts 31 are evenly spaced in the circumferential direction around the center of the first orifice 21. By setting this structure, it can efficiently achieve friction stir additive manufacturing and improve the performance of the finished material.

[0033] Referring to Figure 3 as shown, in some embodiments of the stirring member of the present utility model, the eccentric distance H of the first orifice 21 satisfies the relational expression: 0.5 mm ≤ H ≤ 1.5 mm. In Figure 3 it, the distance between the eccentric shaft 211 and the rotating shaft 11 is the eccentric distance H. When the eccentric distance H is too small, less than 0.5 mm, the gain effect provided by the eccentric structure is limited and there is no obvious advantage compared with the traditional coaxial structure. When the eccentric distance H is too large, greater than 1.5 mm, the stirring effect is too intense, easily damaging the formed deposition layer and even causing the collapse of the deposition layer; at the same time, the overly intense stirring will also introduce more air, causing more internal defects in the formed part. According to experimental data, when 0.5 mm ≤ H ≤ 1.5 mm, good deposition efficiency can be balanced and the quality of the formed part can be ensured without introducing too many defects into the deposition layer. Those skilled in the art can set the specific eccentric distance according to actual needs, such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0034] Referring to Figure 3 as shown, in some embodiments of the stirring member of the present utility model, the second orifice 22 is concentrically arranged with the rotating shaft 11. By setting this structure, it is convenient for the powder material to be fed evenly and the feeding efficiency is ensured.

[0035] Referring to Figure 3 as shown, in some embodiments of the stirring member of the present utility model, the inner wall of the discharge channel 20 is inclined, and the aperture of the first orifice 21 is not greater than the aperture of the second orifice 22. By setting this funnel-shaped structure, it is convenient for the powder material to slide along the inner wall of the discharge channel 20, avoiding material jamming and ensuring the discharge efficiency.

[0036] Referring to Figure 5 as shown, the present utility model discloses a stirring assembly, including a first stirring shaft body 40, a second stirring shaft body 50, and the stirring member described in any one of the above embodiments.

[0037] Specifically, the second stirring shaft body 50 is hollow along its own axis. The second stirring shaft body 50 is sleeved outside the first stirring shaft body 40. A first material channel 60 is formed between the inner wall of the second stirring shaft body 50 and the outer wall of the first stirring shaft body 40. A spiral member 51 is provided on the inner wall of the second stirring shaft body 50. Preferably, the spiral member 51 is integrally formed with the second stirring shaft body 50. The second plane 13 of the stirring body 10 is connected to one axial end of the second stirring shaft body 50. The first material channel 60 and the discharge channel 20 are communicated with each other. For the stirring assembly of the present utility model, since it includes the stirring member described in the above embodiment, it has all the beneficial effects thereof, which will not be elaborated herein. Preferably, each shaft body and the stirring member are coaxially arranged.

[0038] During actual use, powder materials are fed into the first material channel 60, so that the second stirring shaft body 50 rotates relative to the first stirring shaft body 40, so as to apply a force to the powder materials through the spiral member 51, so that the powder materials enter the discharge channel 20 along the first material channel 60. The stirring body 10 connected to the second stirring shaft body 50 rotates synchronously to achieve stirring and rubbing for material addition to the powder materials. Preferably, the stirring body 10 is provided with a connecting portion 14 to be connected to the second stirring shaft body 50 through the connecting portion 14. Those skilled in the art can set the specific connection manner between the two according to actual needs. Preferably, the two are threadedly connected through fasteners. Those skilled in the art can set the manner in which the second stirring shaft body 50 rotates relative to the first stirring shaft body 40 according to actual needs, which will not be elaborated herein.

[0039] Refer to Figure 5 As shown, in some embodiments, the stirring assembly of the present utility model further includes a heat insulation member 52. The heat insulation member 52 is respectively connected to the second plane 13 of the stirring body 10 and one axial end of the second stirring shaft body 50. A second material channel is opened on the heat insulation member 52, and the second material channel is respectively communicated with the discharge channel 20 and the first material channel 60. By providing the heat insulation member 52, it can effectively prevent a large amount of heat from being transferred to the side of the second stirring shaft body 50 during stirring and friction, effectively ensuring the service life of the remaining components, and also avoiding problems such as premature plasticization of the powder materials and blockage.

[0040] Refer to Figure 5As shown, in some embodiments of the stirring assembly of the present utility model, a laser channel 41 is formed by hollowing out the first stirring shaft body 40 along its own axial direction. The laser channel 41 is used for the laser to pass through. By providing the laser channel 41 on the first stirring shaft body 40, a corresponding laser assembly can be arranged to emit a laser that can pass through the laser channel 41, so as to provide heat for the powder material in the friction stir, assisting in realizing additive manufacturing, which not only ensures the high quality of the finished product but also improves the production efficiency. At the same time, it is also convenient to arrange the laser assembly, making the overall space utilization rate relatively high. Preferably, a corresponding heat insulation member 42 is provided on the first stirring shaft body 40 to isolate the heat radiated by the laser and avoid heat causing damage to components and affecting the powder material.

[0041] Referring to Figure 5 As shown, in some embodiments of the stirring assembly of the present utility model, the inner wall of the second stirring shaft body 50 is inclined at one end close to the stirring member, so that the radial dimension of the first material channel 60 gradually decreases from one end to the end connected to the stirring member. By providing this funnel-shaped structure, it is convenient for the powder material to slide down along the inclined surface, avoiding problems such as powder material accumulation and blockage. It should be noted that one end of the first material channel 60 here is not necessarily limited to its axial end, but can be set according to actual needs. For example, it can start to be inclined from the middle position of the axial direction of the first material channel 60.

[0042] The present utility model discloses a friction stir additive manufacturing device, including the stirring assembly described in any one of the above embodiments. Conventional components in the remaining friction stir additive manufacturing devices, such as driving members, guiding members, laser assemblies, etc., will not be elaborated. Since the friction stir additive manufacturing device of the present utility model includes the stirring assembly described in the above embodiments, it has all the beneficial effects of the stirring assembly, which will not be elaborated again. Preferably, the friction stir additive manufacturing device further includes a laser assembly, and a laser that can pass through the laser channel 41 is emitted through the laser assembly, thereby realizing the auxiliary heating of the material.

[0043] Working principle:

[0044] During additive manufacturing, powder material is added to the first material channel 60. When the second stirring shaft body 50 rotates relative to the first stirring shaft body 40, the spiral member 51 applies a force to the powder material located in the first material channel 60, causing the powder material to move along the first material channel 60 and enter the discharge channel 20, and finally be extruded out of the discharge channel 20. The extruded powder material is combined with the base material under the action of each stirring part 31 to realize additive manufacturing.

[0045] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of this utility model creation.

Claims

1. A stirring element, characterized in that: include: A stirring body, wherein the stirring body is configured to be rotatable, and the stirring body comprises a first plane and a second plane which are arranged opposite to each other along the axial direction of the stirring body's rotation axis; a discharge channel, the discharge channel penetrating the stirring body along the axial direction of the rotating shaft of the stirring body, the discharge channel comprising a first orifice located on the first plane and a second orifice located on the second plane, the first orifice being eccentrically arranged relative to the rotating shaft of the stirring body; as well as A stirring needle, wherein the stirring needle is arranged on the first plane, the stirring needle comprises at least one stirring portion, and the stirring portion is arranged outside the first orifice. When there are multiple stirring portions, the multiple stirring portions are arranged around the first orifice.

2. The stirring element according to claim 1, characterized in that: The stirring needle includes a plurality of stirring parts, each of which is configured as an arc-shaped structure, and the plurality of stirring parts are evenly spaced and distributed in a circumferential direction around the center of the first orifice.

3. The stirring element according to claim 1 or 2, characterized in that: The eccentric distance H of the first orifice satisfies the relationship: 0.5 mm ≤ H ≤ 1.5 mm.

4. The stirring element according to claim 1, characterized in that: The second opening is arranged concentrically with the rotation axis.

5. The stirring element according to claim 4, characterized in that: The inner wall of the discharge channel is inclined, and the aperture of the first orifice is not larger than the aperture of the second orifice.

6. A stirring assembly, characterized in that: include: A first stirring shaft; a second stirring shaft body, wherein the second stirring shaft body is hollow along its own axial direction, the second stirring shaft body is sleeved outside the first stirring shaft body, a first material channel is formed between the inner wall of the second stirring shaft body and the outer wall of the first stirring shaft body, and a spiral member is provided on the inner wall of the second stirring shaft body; as well as According to any one of claims 1 to 5, the second plane of the stirring body is connected to an axial end of the second stirring shaft, and the discharge channel is connected to the first material channel.

7. The stirring assembly according to claim 6, characterized in that: It also includes a heat insulation component, which is respectively connected to the second plane of the stirring body and one axial end of the second stirring shaft body. The heat insulation component is provided with a second material channel, which is respectively connected to the discharge channel and the first material channel.

8. The stirring assembly according to claim 6, characterized in that: The first stirring shaft body is hollow along its axial direction to form a laser channel, and the laser channel is used for laser to pass through.

9. The stirring assembly according to claim 6, characterized in that: The inner wall of the second stirring shaft body is inclined at one end close to the stirring member, so that the radial dimension of the first material channel gradually decreases from one end thereof to the end connected to the stirring member.

10. A friction stir additive device, characterized in that: Comprising a stirring assembly as claimed in any one of claims 6 to 9.

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