Friction stir additive equipment

Abstract

The present invention discloses a friction stir additive manufacturing device, which belongs to the field of friction stir additive manufacturing, comprising: a first driving member, the first driving member comprising a stator assembly and a rotor, the stator assembly being hollow to form a feeding channel, and the rotor being arranged on the outside of the stator assembly; a welding tool, the welding tool being hollow to communicate with the feeding channel, and the rotor being dynamically coupled to the welding tool; a feeding assembly, the feeding assembly being installed in the feeding channel and extending to the welding tool; in the present application, by arranging the rotor on the outside of the stator assembly, the stator assembly is hollow to form a feeding channel for feeding the feeding assembly, thereby utilizing the stator assembly to separate the rotor from the feeding assembly, thereby preventing the rotor and the feeding assembly from rubbing the powder simultaneously during the feeding process of the feeding assembly, causing the powder to be plasticized prematurely in the feeding channel, causing the feeding channel to be blocked, and affecting the subsequent powder transportation.

Description

Technical Field

[0001] The present application relates to the technical field of friction stir additive manufacturing, and in particular to a friction stir additive manufacturing device. Background Art

[0002] In the prior art, the announcement number is: CN111804910B, and the invention name is: Stir friction forging additive manufacturing method and device for nano-reinforced matrix composite materials. It discloses that powder is fed into the hollow spindle cavity, and then the powder in the cavity is stirred and mixed by a mixing screw extended into the hollow spindle cavity. However, since the rotor of the hollow servo motor also drives the hollow spindle to rotate during the process of rotating the mixing screw to mix the powder, the powder in the hollow spindle cavity is easily plasticized in the cavity in advance, causing channel blockage. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, an embodiment of the present application proposes a friction stir additive device, comprising: a first driving member, the first driving member comprising a stator assembly and a rotor, the stator assembly being hollow to form a feed channel, the rotor being disposed outside the stator assembly; a welding tool, the welding tool being hollow to communicate with the feed channel, the rotor being power-coupled to the welding tool; and a feed assembly, the feed assembly being installed in the feed channel and extending to the welding tool.

[0004] In the present application, the rotor is arranged on the outside of the stator assembly, and the stator assembly is hollow to form a feeding channel for feeding the feeding assembly, so that the stator assembly is used to separate the rotor and the feeding assembly, thereby avoiding the situation in which the rotor and the feeding assembly rub the powder at the same time during the feeding process of the feeding assembly, causing the powder to be plasticized prematurely in the feeding channel, causing the feeding channel to be blocked, and affecting the subsequent powder transportation.

[0005] According to some embodiments of the present invention, the stator assembly includes a stator, a stator flange, and a stator mounting seat. The stator is mounted on the stator mounting seat through the stator flange, and the stator mounting seat is disposed in a housing of a friction stir additive device.

[0006] According to some embodiments of the present invention, the stator assembly further includes a stator adjustment seat, which is hollow to form an extrusion channel. The stator adjustment seat is detachably mounted on an end of the stator mounting seat close to the welding tool, so that the extrusion channel constitutes the discharge end of the feeding channel.

[0007] According to some embodiments of the present invention, the welding tool is a hollow structure with one end open and having side walls and a bottom wall, the bottom wall is formed as a welding tool shoulder, and a discharge hole is provided in the center of the bottom wall, a chip removal hole is provided on the side wall, and the inner surface of the side wall forms a chip removal platform extending from the bottom wall to the open end of the welding tool, and the axial distance from the end face of the chip removal platform to the open end is not greater than the axial distance from the chip removal hole to the open end.

[0008] According to some embodiments of the present invention, an axial gap L between an end of the chip removal platform facing away from the welding tool and an end of the stator adjustment seat close to the welding tool satisfies 0.0005 mm ≤ L ≤ 10 mm.

[0009] According to some embodiments of the present invention, the welding tool further includes a connecting portion, which is connected to the side wall and extends radially outward, the end surface of the connecting portion facing away from the bottom wall is flush with the side wall, and a plurality of mounting holes are provided on the connecting portion.

[0010] According to some embodiments of the present invention, the connecting portion is further provided with a plurality of top screw holes, and the top screw holes and the mounting holes are staggered in the circumferential direction.

[0011] According to some embodiments of the present invention, a second driving member is further included, which drives the feeding assembly to rotate in the feeding channel. The feeding assembly is a screw, and the screw includes a rod body. The rod body includes: a conveying section, a mixing section and an extrusion section. The conveying section is arranged at one end of the rod body close to the second driving member, and the conveying section is provided with a conveying screw rib extending spirally along the axial direction of the rod body; the extrusion section is arranged at one end of the rod body facing the welding tool, and the extrusion section is provided with an extrusion screw rib extending spirally along the axial direction of the rod body; the mixing section is arranged between the conveying section and the extrusion section, and the mixing section is provided with ribs along the circumference of the screw.

[0012] According to some embodiments of the present invention, the extrusion section is located axially within the extrusion channel.

[0013] According to some embodiments of the present invention, the helix angle of the rib is smaller than the helix angle of the conveying spiral fin, the helix angle of the conveying spiral fin is larger than the helix angle of the extrusion spiral fin, and the pitch of the conveying spiral fin is larger than the pitch of the extrusion spiral fin.

[0014] Additional aspects and advantages of the application will be given in part in the description that follows, and in part will be obvious from the description that follows, or will be learned through practice of the application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 is a schematic diagram of a friction stir additive device according to an embodiment of the present application;

[0017] Figure 2 1 is a schematic diagram of the structure of a welding tool according to an embodiment of the present application from a first angle;

[0018] Figure 3 is a schematic diagram of the second angle structure of the welding tool according to an embodiment of the present application;

[0019] Figure 4 3 is a schematic structural diagram of a welding tool according to an embodiment of the present application from a third angle;

[0020] Figure 5 It is a structural schematic diagram of the feeding assembly according to an embodiment of the present application.

[0021] Reference numerals: friction stir additive device 10;

[0022] First driving member 1; stator assembly 11; rotor 12; stator 111; stator flange 112; stator mounting seat 113; stator adjustment seat 114;

[0023] Feeding channel 2; extrusion channel 21;

[0024] Welding tool 3; side wall 31; shaft shoulder 32; discharge hole 33; chip removal hole 34; chip removal platform 35; connecting portion 36; mounting hole 361; top screw hole 362;

[0025] A second driving member 4;

[0026] Feeding assembly 5; rod body 51; conveying screw rib 52; extrusion screw rib 53; convex rib 54. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] Reference below Figure 1-Figure 5 A friction stir additive manufacturing apparatus according to an embodiment of the present invention is described.

[0029] like Figure 1-Figure 5As shown, the friction stir additive device 10 according to an embodiment of the present invention includes: a feeding channel 2, a feeding assembly 5, a welding tool 3 and a first driving member 1, and the first driving member 1 includes a stator assembly 11 and a rotor 12.

[0030] Specifically, the friction stir additive manufacturing device 10 of the embodiment of the present invention can also be provided with one or more silos for storing raw materials for additive manufacturing. The raw materials can be in granular or powdered form. The types of raw materials in different silos can be the same or different. The stator component 11 is hollow to form a feeding channel 2 for conveying raw materials. The welding tool 3 forms a hollow area connected to the feeding channel 2 to receive the raw materials conveyed by the feeding channel 2. The feeding component 5 is installed in the feeding channel 2 and extends into the welding tool 3. The discharge port of the silo is connected to the feed end of the feeding channel 2 through a conveying pipe. The raw materials are conveyed to the feeding component 5 through the feeding port of the feeding channel 2 through the conveying pipe. The feeding component 5 The raw material is transported to the hollow part of the welding tool 3, and the rotor 12 drives the welding tool 3 to rotate. The feeding assembly 5 cooperates with the rotating welding tool 3 to frictionally squeeze the raw material in the hollow part of the welding tool 3. The feeding assembly 5 and the welding tool 3 rotate relative to each other, so that the raw material between the feeding assembly 5 and the welding tool 3 rubs against the adjacent raw material, the surface of the feeding assembly 5 and the surface of the welding tool 3. The heat generated by the friction causes the raw material to be slightly softened, and the raw material enters a state of premature plasticization. When the raw material in the state of premature plasticization is transferred to contact with the substrate, stirring friction occurs between the raw material and the substrate, and the heat generated causes the raw material to be plastically softened, and then deposited on the substrate to form an additive component.

[0031] In addition, in the embodiment of the present invention, the rotor 12 is arranged on the outside of the stator assembly 11, and multiple bearings are arranged between the rotor 12 and the stator assembly 11 along the axial and radial directions of the stator assembly 11 to provide stable support for the rotor 12 and prevent the rotor 12 from contacting the stator during rotation. The feeding assembly 5 is located in the hollow channel opened by the stator assembly 11, and the stator assembly 11 is used to separate the rotor 12 from the feeding assembly 5, thereby avoiding the rotor 12 and the feeding assembly 5 rotating simultaneously to rub the raw materials during the feeding process of the feeding assembly 5, causing the raw materials to be plasticized prematurely in the feeding channel 2, causing the feeding channel 2 to be blocked, and affecting the subsequent transportation of the raw materials.

[0032] According to some embodiments of the present invention, the stator assembly 11 includes a stator 111, a stator flange 112, and a stator mounting seat 113. The stator mounting seat 113 can be fastened to the housing of the stir friction additive device 10 by screws and other fixing parts to limit and fix the stator 111. The stator 111 and the stator mounting seat 113 are connected by the stator flange 112, which improves the sealing of the connection between the stator 111 and the stator mounting seat 113 and facilitates the subsequent disassembly and maintenance of the stator 111 or the stator flange 112.

[0033] According to some embodiments of the present invention, the stator assembly 11 further includes a stator adjustment seat 114, which is hollow to form an extrusion channel 21. The stator adjustment seat 114 is detachably mounted on one end of the stator mounting seat 113 close to the welding tool 3, so that the extrusion channel 21 constitutes the discharge end of the feeding channel 2; since the extrusion channel 21 constitutes the tail end of the feeding channel 2, the raw materials delivered by the feeding assembly 5 will accumulate at the extrusion channel 21, which can easily cause channel blockage. By arranging a detachable stator adjustment seat 114 at the position where blockage is most likely to occur to form the extrusion channel 21, when channel blockage occurs, the stator adjustment seat 114 can be partially replaced, thereby avoiding the need for repair and replacement of the entire machine and reducing maintenance costs and difficulty.

[0034] According to some embodiments of the present invention, Figure 2-4 As shown, the welding tool 3 is a hollow structure with a side wall 31 and a bottom wall. One end of the welding tool 3 is open to communicate with the feeding channel 2 to receive the raw material conveyed by the feeding assembly 5. The bottom wall of the welding tool 3 is formed as a shoulder 32 of the welding tool 3, and a discharge hole 33 is provided in the center of the bottom wall. The discharge hole 33 is used to discharge the raw material in the welding tool 3 that has entered a pre-plasticized state onto the substrate. When the raw material in the pre-plasticized state is transferred to contact with the substrate, stirring friction occurs between the raw material and the substrate, and the heat generated causes the raw material to undergo plastic softening, and then is deposited on the substrate to form an additive component. A chip discharge hole 34 is provided on the side wall 31 for discharging excess raw material to avoid excessive raw material causing the discharge port to be unable to be discharged in time, causing the discharge port to be blocked, further aggravating the degree of blockage of the raw material in the welding tool 3, thereby increasing the resistance of the feeding assembly 5 to convey the raw material downward, increasing The probability of raw material clogging the feeding channel 2 is reduced, and the embodiment of the present invention can set a plurality of chip removal holes 34 at circumferential intervals along the side wall 31, and the plurality of chip removal holes 34 are arranged at different heights. At the same time, the depths of the plurality of chip removal holes 34 are different, thereby effectively improving air flow and reducing the temperature of the welding tool 3, avoiding overheating of the welding tool 3 and affecting the quality of additive manufacturing. The inner surface of the side wall 31 of the welding tool 3 forms a chip removal platform 35 extending from the bottom wall to the open end of the welding tool 3, which is used to scrape the excess raw material in the welding tool 3 and make it enter the chip removal hole 34, thereby improving the chip removal efficiency, and the distance from the end face of the chip removal platform 35 to the open end of the welding tool 3 in the axial direction of the welding tool 3 is not greater than the distance from the chip removal hole 34 to the open end in the axial direction of the welding tool 3. By reasonably arranging the height of the chip removal hole 34 and the chip removal platform 35, the utilization rate of the chip removal hole 34 is increased and the chip removal efficiency is improved.

[0035] The embodiment of the present invention provides a chip removal hole 34 on the side wall 31 of the welding tool 3 and a chip removal platform 35 in the welding tool 3, and limits the height of the welding tool 3 and the chip removal platform 35, so as to timely discharge excess raw material to prevent the raw material from accumulating in the welding tool 3 and blocking the chip removal hole 34. When there is a lot of raw material in the welding tool 3 and the discharge hole 33 is blocked, the chip removal platform 35 is used to scrape the excess raw material accumulated above the discharge hole 33, so that the excess raw material falls into the chip removal hole 34. The centrifugal force generated by the welding tool 3 during the rotation process throws the excess raw material out of the chip removal hole 34. At the same time, the chip removal platform 35 is higher than the chip removal hole 34, so that the raw material can be discharged from any place of the chip removal hole 34, thereby improving the utilization rate of the chip removal hole 34 and further improving the chip removal efficiency.

[0036] According to some embodiments of the present invention, the axial gap L between the end of the chip removal platform 35 facing away from the welding tool 3 and the end of the stator adjustment seat 114 close to the welding tool 3 satisfies 0.0005mm≤L≤10mm; for example, the gap size can be 0.0005mm, 5mm and 10mm, etc.; to avoid interference between the chip removal platform 35 and the stator adjustment seat 114 when the welding tool rotates, so that excess raw material in the welding tool can be discharged through the gap.

[0037] According to some embodiments of the present invention, Figure 2 As shown, the welding tool 3 also includes a connecting portion 36 for connecting the welding tool 3. The connecting portion 36 is connected to the side wall 31 and extends radially outward. The end surface of the connecting portion 36 facing away from the bottom wall is flush with the side wall 31. A plurality of mounting holes 361 are opened on the connecting portion 36. Fasteners are passed through the mounting holes 361 to connect the connecting portion 36 and the rotor 12. The welding tool 3 is detachably connected to the rotor 12 through the fasteners and the mounting holes 361, so that the rotor 12 can drive the welding tool 3 to rotate, and the convenience of disassembly and assembly of the welding tool 3 is improved.

[0038] According to some embodiments of the present invention, Figure 2 As shown, a plurality of top screw holes 362 are further provided on the connecting portion 36. The top screws pass through the top screw holes 362 to provide an upward thrust for the connecting portion 36, thereby ensuring that the position of the welding tool 3 is fixed, further improving the connection reliability between the welding tool 3 and the rotor 12. At the same time, during disassembly, the welding tool 3 can be disassembled simply and quickly through the reverse push effect of the top screws in the top screw holes 362, thereby improving work efficiency. In some specific embodiments, the top screw holes 362 and the mounting holes 361 are staggered in the circumferential direction. By staggering the top screw holes 362 and the mounting holes 361, the fastening force is evenly distributed, local stress concentration is reduced, and the stability of the structure is improved.

[0039] According to some embodiments of the present invention, the friction stir additive device 10 also includes a second driving member 4, which drives the feeding assembly 5 to rotate in the feeding channel 2 to convey the raw materials downward. The feeding assembly 5 is a screw, which includes a rod body 51. The rod body 51 includes: a conveying section, a mixing section and an extrusion section. The conveying section is arranged at one end of the rod body 51 close to the second driving member 4, and the conveying section is provided with a conveying screw rib 52 that extends spirally along the axial direction of the rod body 51. Under the drive of the second driving member 4, the conveying screw rib 52 pushes the raw materials downward; the extrusion section is arranged at one end of the rod body 51 facing the welding tool 3, and the extrusion section is provided with an extrusion screw rib 53 that extends spirally along the axial direction of the rod body 51. The extrusion screw rib 53 cooperates with the welding tool 3 to frictionally extrude the raw materials between the two so that the raw materials enter an early plasticized state (pre-plasticized); the mixing section is arranged between the conveying section and the extrusion section, and the mixing section is provided with a rib 54 along the circumference of the screw for evenly mixing different raw materials.

[0040] According to some embodiments of the present invention, the extrusion section is axially located in the extrusion channel 21, and the extrusion screw fins 53 cooperate with the inner side wall of the extrusion channel 21 to frictionally extrude the powder between adjacent threads to achieve early plasticization of the powder, thereby improving the plasticization efficiency. Moreover, since the stator adjustment seat 114 forming the extrusion channel 21 is detachable, the extrusion section is set to be axially located in the extrusion channel 21. When the extrusion channel 21 is blocked by powder, the stator adjustment seat 114 can be replaced and the powder accumulated in the extrusion section can be cleaned, thereby improving the convenience of maintenance of the stir friction additive equipment 10.

[0041] According to some embodiments of the present invention, Figure 5 As shown, the helix angle of the rib 54 is smaller than the helix angle of the conveying screw rib 52, the helix angle of the conveying screw rib 52 is larger than the helix angle of the extrusion screw rib 53, and the pitch of the conveying screw rib 52 is larger than the pitch of the extrusion screw rib 53; the conveying screw rib 52 has a larger pitch and helix angle, so that the powder is quickly conveyed downward, avoiding the accumulation of raw materials during the conveying process and causing the feeding channel 2 to be blocked, and the larger helix angle can also avoid the compression ratio of the raw materials at the conveying screw rib 52 being too large, reducing the risk of the raw materials being plasticized in the feeding channel 2 in advance, the rib 54 adopts a smaller helix angle to further reduce the conveying speed of the raw materials in the mixing section, so that the powder can be fully mixed in the mixing section, and the extrusion screw rib 53 adopts a smaller pitch and helix angle to reduce the downward conveying speed of the raw materials and increase the compression ratio of the raw materials at the extrusion screw rib, thereby allowing the raw materials to enter the early plasticized state in the extrusion channel 21, thereby facilitating the subsequent formation of additive manufacturing components on the substrate.

[0042] According to some embodiments of the present invention, a heating device may be provided in the extrusion section, such as using a resistance wire to wrap around the extrusion screw fins 53 to provide heat and accelerate the plasticization of the powder.

[0043] In the description of the present invention, 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 to 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0045] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A friction stir additive device, characterized in that: include: a first driving member, the first driving member comprising a stator assembly and a rotor, the stator assembly being hollow to form a feeding channel, and the rotor being arranged outside the stator assembly; A welding tool, wherein the welding tool is hollow so as to communicate with the feeding channel, and the rotor is power-coupled to the welding tool; A feeding assembly is installed in the feeding channel and extends into the welding tool; the stator assembly includes a stator and a stator mounting seat, the stator is installed on the stator mounting seat, and the stator mounting seat is arranged in the housing of the stir friction additive device; the stator assembly also includes a stator adjustment seat, the stator adjustment seat is hollow to form an extrusion channel, and the stator adjustment seat is detachably installed on one end of the stator mounting seat close to the welding tool, so that the extrusion channel constitutes the discharge end of the feeding channel.

2. The friction stir additive device according to claim 1, characterized in that: The stator assembly includes a stator flange, and the stator is mounted on the stator mounting seat through the stator flange.

3. The friction stir additive device according to claim 1, characterized in that: The welding tool is a hollow structure with one end open to communicate with the feeding channel and having side walls and a bottom wall. The bottom wall is formed as a welding tool shoulder, and a discharge hole is provided in the center of the bottom wall. A chip removal hole is provided on the side wall. The inner surface of the side wall forms a chip removal platform extending from the bottom wall to the open end of the welding tool, and the axial distance from the end face of the chip removal platform to the open end is not greater than the axial distance from the chip removal hole to the open end.

4. The friction stir additive device according to claim 3, characterized in that: An axial gap L is formed between an end of the chip removal platform facing away from the welding tool and an end of the stator adjustment seat close to the welding tool, satisfying 0.0005 mm ≤ L ≤ 10 mm.

5. The friction stir additive device according to claim 4, characterized in that: The welding tool also includes a connecting portion, which is connected to the side wall and extends radially outward. The end surface of the connecting portion facing away from the bottom wall is flush with the side wall. A plurality of mounting holes are provided on the connecting portion, and fasteners are passed through the mounting holes to connect the connecting portion and the rotor.

6. The friction stir additive device according to claim 5, characterized in that: The connecting portion is further provided with a plurality of top screw holes, and the top screw holes and the mounting holes are staggeredly arranged along the circumferential direction.

7. The friction stir additive device according to claim 1, characterized in that: It also includes a second driving member, which drives the feeding assembly to rotate in the feeding channel. The feeding assembly is a screw, which includes a rod body. The rod body includes: a conveying section, a mixing section and an extrusion section. The conveying section is arranged at one end of the rod body close to the second driving member, and the conveying section is provided with a conveying screw rib extending spirally along the axial direction of the rod body; the extrusion section is arranged at one end of the rod body facing the welding tool, and the extrusion section is provided with an extrusion screw rib extending spirally along the axial direction of the rod body; the mixing section is arranged between the conveying section and the extrusion section, and the mixing section is provided with ribs along the circumference of the screw.

8. The friction stir additive device according to claim 7, characterized in that: The extrusion section is located in the extrusion channel in the axial direction.

9. The friction stir additive device according to claim 8, characterized in that: The helix angle of the convex rib is smaller than the helix angle of the conveying spiral fin, the helix angle of the conveying spiral fin is larger than the helix angle of the extrusion spiral fin, and the pitch of the conveying spiral fin is larger than the pitch of the extrusion spiral fin.

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