Stirring friction material adding device

Abstract

The utility model provides a stirring friction additive device, which belongs to the technical field of additive manufacturing, and comprises a shaft shoulder, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft, a stirring shaft and a stirring shaft, the shaft shoulder is internally provided with a cavity, and one end of the shaft shoulder is provided with a discharge port; the screw rod is arranged in the cavity, the screw rod comprises a first threaded section, a connecting section and a second threaded section which are connected in sequence, the first threaded section and the second threaded section are both provided with threads, and the outer diameter of the first threaded section and the outer diameter of the second threaded section are both larger than the outer diameter of the connecting section; the side wall of the cavity is provided with a plurality of feeding holes, at least one feeding hole faces the first threaded section, and at least one feeding hole faces the second threaded section. The wire is cut by the first thread section and the second thread section of the screw rod structure in a layered mode, the wire cutting efficiency is improved, meanwhile, synchronous wire feeding of multiple wire feeding mechanisms can be achieved through the multiple feeding holes, and the requirement for efficient deposition of large structural parts is met.

Description

Technical Field

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

[0002] Continuous wire-feeding friction stir additive manufacturing is a technology that achieves layer-by-layer deposition of metal materials based on side-axis wire feeding and synchronous thermoplasticization. It is particularly suitable for lightweight alloys such as aluminum and magnesium. The specific process is wire feeding, and the high-speed rotation of the screw cuts the fed wire into particles and transmits it downward along the screw, and thermoplastic deposition forms an additive layer under the action of friction and plastic deformation heat. Compared with traditional melting-based additive manufacturing with arc and laser as heat sources, stir friction additive manufacturing has low heat input, uniform internal structure of the prepared components, and good isotropy. However, this method has low deposition efficiency, and the traditional single-feed method has no obvious advantages in the field of industrial preparation of large structural parts. Therefore, there is an urgent need for a suitable method to improve the deposition efficiency of continuous wire-feeding friction stir additive manufacturing. Utility Model Content

[0003] In view of this, the utility model aims to propose a stir friction additive manufacturing device to solve the problem that the existing single-filament wire feeding speed cannot meet the simultaneous wire feeding, resulting in low deposition efficiency and unable to meet the demand for rapid response of large components in stir friction additive manufacturing.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] According to the utility model, a friction stir additive device includes: a shoulder, a cavity is provided inside the shoulder, and a discharge port is provided at one end of the shoulder; a screw rod is arranged in the cavity, and the screw rod includes a first thread segment, a connecting segment and a second thread segment connected in sequence, the first thread segment and the second thread segment are both provided with threads, and the outer diameters of the first thread segment and the second thread segment are both larger than the outer diameter of the connecting segment; wherein a plurality of feed holes are opened on the side wall of the cavity, at least one feed hole faces the first thread segment, and at least one feed hole faces the second thread segment.

[0006] According to the friction stir additive device of the utility model, a screw is provided in the shoulder, and the screw includes a first thread segment and a second thread segment. The first thread segment and the second thread segment can cut the wire into particles in layers when the wire is fed, thereby improving the wire shearing efficiency and effectively avoiding the blockage of the wire particles. At the same time, a plurality of feed holes are opened on the side wall of the shoulder, which can realize the synchronous wire feeding of multiple wire feeding mechanisms to meet the efficient deposition requirements of large structural parts.

[0007] In some embodiments, the plurality of feed holes are arranged at intervals along the circumference of the shaft shoulder. The plurality of feed holes are dispersed in the circumference of the shaft shoulder to avoid concentrated feed and blockage.

[0008] In some embodiments, the distances between the plurality of feed holes and the end of the shaft shoulder are not equal. The plurality of feed holes are dispersed in the height direction of the shaft shoulder, so that the feed positions of the plurality of feed holes are staggered, further avoiding concentrated feed and blockage.

[0009] In some embodiments, the axis of the feed hole intersects with the axis of the shaft shoulder and the angle formed away from the discharge port is an acute angle; the axis of the feed hole extends away from the discharge port in a direction away from the shaft shoulder. During operation, the wire fed through the feed hole can contact the screw at a certain inclination angle, increasing the contact area between the wire and the threaded segment while saving layout space, facilitating the synchronous feeding of multiple wires.

[0010] In some embodiments, the screw includes a rod body, one end of the rod body is provided with an external thread to form the first thread segment, the other end of the rod body is provided with an external thread to form the second thread segment, the first thread segment and the second thread segment are spaced apart along the axis of the screw, and the rod body between the first thread segment and the second thread segment forms the connecting segment. When working, the first thread segment and the second thread segment correspondingly cut the wires fed by the multiple feed holes, so as to realize the hierarchical cutting of the wires into particles, improve the wire shearing efficiency, and avoid the blockage of the wire particles.

[0011] In some embodiments, the thread direction, pitch and flight height of the first thread segment and the second thread segment are the same, so as to ensure that the cut particles are of equal size and facilitate plastic deformation between the particles.

[0012] In some embodiments, the length of the first thread segment is L1, the length of the second thread segment is L2, and the length of the screw is L, satisfying: L1≥0.3L, L2≥0.3L. During operation, the cut wire particles can smoothly fall to the discharge port.

[0013] In some embodiments, a stirring pin is further provided at the end of the screw, and the stirring pin extends out of the cavity from the discharge port. During operation, the cut wire particles are thermoplastically deposited in the friction between the stirring pin and the substrate and the plastic deformation between the particles to form an additive component.

[0014] In some embodiments, the length of the stirring needle is L4, which satisfies: 1 mm ≤ L4 ≤ 5 mm. The length of the stirring needle within the above range can better achieve the friction between the stirring needle and the substrate on the wire particles.

[0015] In some embodiments, the shoulder further includes a clamping end, and an end of the screw rod away from the discharge port extends out of the clamping end and is coupled to a power source. During operation, the power source provides cutting power to the screw rod to cut the wire, and the clamping end is used to fix the shoulder to prevent the shoulder from shifting or shaking during the material addition process.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic structural diagram of a friction stir additive device according to some embodiments of the utility model;

[0019] Figure 2 This is a schematic diagram of the shoulder structure described in an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the screw structure described in an embodiment of the utility model;

[0021] Figure 4 It is a schematic structural diagram of the feeding mechanism and wire material described in an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] Friction stir additive device 100;

[0024] Shaft shoulder 1; discharge port 11; feed hole 12; clamping end 13;

[0025] Screw 2;

[0026] Rod body 21; first thread segment 211; second thread segment 212; connecting segment 213; stirring needle 22;

[0027] Feeding mechanism 3; wire material 4; additive manufacturing part 5; substrate 6. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] The following will refer to the attached Figure 1-4 The utility model is described in detail in conjunction with the embodiments.

[0030] A friction stir additive device 100 according to the utility model comprises a shoulder 1 and a screw 2 .

[0031] Among them, a cavity is provided inside the shoulder 1, and the screw 2 is installed in the cavity of the shoulder 1. The screw 2 includes a first thread segment 211, a connecting segment 213 and a second thread segment 212 which are connected in sequence. The first thread segment 211 and the second thread segment 212 are both provided with threads, and the outer diameters of the first thread segment 211 and the second thread segment 212 are both larger than the outer diameter of the connecting segment 213. A plurality of feed holes 12 are provided on the side wall of the cavity, at least one feed hole 12 faces the first thread segment 211, and at least one feed hole 12 faces the second thread segment 212. Thus, synchronous feeding of multiple wires 4 is achieved through the plurality of feed holes 12, and the wires 4 are cut by the threads of the first thread segment 211 and the second thread segment 212 on the screw 2 during its rotation, so as to achieve layered cutting of the wires and improve deposition efficiency, so as to meet the requirements of efficient deposition of large structural parts.

[0032] Refer to the following Figure 1-Figure 4 The friction stir additive manufacturing device 100 according to the present invention is described.

[0033] like Figure 1-4 As shown, the friction stir additive device 100 includes a shoulder 1, a screw 2, a feeding mechanism 3 and a base plate 6.

[0034] The shoulder 1 is arranged on one side of the substrate 6 , a cavity is arranged inside the shoulder 1 , a discharge port 11 is arranged at one end of the shoulder 1 facing the substrate 6 , and the substrate 6 is used to carry the additively manufactured part 5 deposited from the discharge port 11 .

[0035] The screw rod 2 is disposed in the cavity, and the screw rod 2 includes a first thread segment 211, a connecting segment 213, and a second thread segment 212 connected in sequence. The first thread segment 211 and the second thread segment 212 are both provided with threads, and the outer diameters of the first thread segment 211 and the second thread segment 212 are both larger than the outer diameter of the connecting segment 213. The threads of the first thread segment 211 and the threads of the second thread segment 212 on the screw rod 2 are used to cut the wire 4 respectively, wherein the thread segment located at the end away from the discharge port 11 (such as Figure 3 The first thread segment 211 shown in FIG. 1 can cut the wire 4, and the cut particles are transported to the thread segment (such as FIG. 211 ) near one end of the discharge port 11 through the connecting rod. Figure 3 At the second thread segment 212 shown in the figure, the particles are synchronously displaced toward the discharge port 11 with the wire 4 particles cut at the position of the second thread segment 212, and the wire 4 particles after cutting are thermoplastically deposited during the friction between the screw 2 and the substrate 6 and the plastic deformation between the particles to form an additive component.

[0036] In some specific examples, such as Figure 1 and Figure 3 , 4 As shown, when the substrate 6 is horizontally arranged, the shoulder 1 and the screw 2 are located on one side of the upper surface of the substrate 6 and are vertically arranged relative to the upper surface of the substrate 6, and the first thread segment 211 and the second thread segment 212 respectively cut the wire 4, wherein the wire 4 fed from the position of the first thread segment 211 is cut, and under the action of the thread rotation of the first thread segment 211 and its own gravity, it falls into the second thread segment 212 through the connecting rod along the thread of the first thread segment 211, and continues to be transmitted downward synchronously with the particles of the wire 4 cut by the second thread segment 212, and is thermoplastically deposited during the friction between the screw 2 and the substrate 6 and the plastic deformation between the particles to form an additive component.

[0037] In some examples, the diameter of the screw 2 is 10-30 mm, for example, 10 mm, 11 mm, 30 mm, etc.

[0038] The side wall of the cavity is provided with a plurality of feed holes 12, at least one feed hole 12 faces the first thread segment 211, and at least one feed hole 12 faces the second thread segment 212. The wire 4 enters the shaft shoulder 1 along the feed hole 12 for feeding. The feed hole 12 guides the wire 4 to feed toward the corresponding first thread segment 211 or second thread segment 212 to avoid blockage caused by the wires being concentrated at the same position.

[0039] In some examples, there are at least four feed holes 12, thereby achieving continuous friction stir additive manufacturing of four or more wires to meet the requirements of efficient deposition of large structural parts.

[0040] There are multiple feeding mechanisms 3, and the multiple feeding mechanisms 3 are arranged on the outer peripheral side of the shoulder 1, and the multiple feeding mechanisms 3 correspond one by one to the multiple feeding holes 12. The feeding mechanism 3 carries the wire 4, which is used to carry and transport the wire 4 and position the wire 4 so that it is fed along the feed hole 12 toward the corresponding first thread segment 211 or second thread segment 212.

[0041] In some examples, the diameter of the wire 4 is 0.6-4 mm, for example, 0.6 mm, 0.7 mm, 4 mm, etc.

[0042] In some examples, the material of the wire 4 may be, but is not limited to, aluminum, magnesium, titanium alloy, etc.

[0043] In some examples, the wire feeding speed of the feeding mechanism 3 is 1-50 m / min.

[0044] According to the friction stir additive device 100 of the utility model, when working, the first thread segment 211 and the second thread segment 212 on the screw 2 are driven to rotate, and at the same time, multiple wires 4 are synchronously fed through multiple feed holes 12 toward the corresponding first thread segment 211 or second thread segment 212. During the rotation of the first thread segment 211 and the second thread segment 212 on the screw 2, the wires 4 fed at corresponding positions are cut respectively, so as to achieve layered cutting of the wires, improve the shearing efficiency of the wires 4, and effectively avoid clogging of the wire 4 particles. At the same time, multiple feed holes 12 are opened on the side wall of the shoulder 1, so as to achieve synchronous feeding of multiple wires and avoid clogging caused by feeding the wires at the same position, so as to meet the requirements of efficient deposition of large structural parts.

[0045] Refer to the following Figure 1-Figure 4 Some embodiments of the friction stir additive manufacturing apparatus 100 according to the present invention are described.

[0046] In some embodiments, Figure 2 As shown, a plurality of feed holes 12 are arranged at intervals along the circumference of the shaft shoulder 1 .

[0047] It is understandable that, during operation, since the plurality of feed holes 12 are dispersed in the circumferential direction of the shaft shoulder 1 , it is possible to avoid the feed position being concentrated, which would cause the wire 4 particles to be blocked in the threads of the screw 2 .

[0048] In some embodiments, Figure 2 As shown, the distances between the multiple feed holes 12 and the end of the shaft shoulder 1 are not equal.

[0049] It is understandable that the distances between the multiple feed holes 12 and the end of the shoulder 1 are not equal, that is, the multiple feed holes 12 are dispersed in the height direction of the shoulder 1. During operation, the multiple feed holes 12 are dispersed in the height direction of the shoulder 1 and in the circumferential direction of the shoulder 1, so that the feed positions of the multiple feed holes 12 are staggered, further avoiding concentrated feeding and blockage.

[0050] In some examples, the aperture of the feed hole 12 is 1.0-4.4 mm, for example, 1.1 mm, 1.2 mm, 4.4 mm, etc. It is understandable that the aperture of the feed hole 12 of 1.0-4.4 mm can ensure smooth feeding of the wire 4.

[0051] In some examples, the feed spacing between adjacent feed holes is 10 mm. It can be understood that the 10 mm feed spacing between adjacent feed holes can prevent interference between the wires 4 caused by adjacent feed holes 12 being too close.

[0052] In some embodiments, Figure 1-2As shown, the axes of the multiple feed holes 12 intersect with the axis of the shaft shoulder 1 and the angle formed away from the discharge port 11 is an acute angle; the axis of the feed hole 12 extends from the direction away from the shaft shoulder 1 to the direction away from the discharge port 11.

[0053] In some specific embodiments, taking one of the feed holes as an example, Figure 2 As shown, the axis of the shoulder 1 is A, the axis of one of the feed holes 12 is B, and the angle formed by the axis A of the shoulder 1 and the axis B of the feed hole 12 away from the discharge port 11 is α, wherein α is greater than 0° and less than 90°.

[0054] It can be understood that since the feed hole 12 is set at an angle, the wire 4 fed through the feed hole 12 can contact the screw 2 at a certain inclination angle, increasing the contact area between the wire 4 and the threaded segment while saving layout space, making it easy to set up multiple feeding mechanisms 3 and realize synchronous feeding of multiple wires 4.

[0055] In some embodiments, Figure 3 As shown, the screw rod 2 includes a rod body 21, one end of the rod body 21 is provided with an external thread to form a first thread segment 211, and the other end of the rod body 21 is provided with an external thread to form a second thread segment 212. The first thread segment 211 and the second thread segment 212 are spaced apart along the axis of the screw rod 2, and the rod body 21 between the first thread segment 211 and the second thread segment 212 forms a connecting segment 213.

[0056] It can be understood that during operation, the screw 2 rotates to drive the first thread segment 211 and the second thread segment 212 on the rod body 21 to rotate synchronously. When the wire 4 is fed, the wire 4 fed synchronously by the multiple feeding holes 12 is cut into particles during the rotation of the first thread segment 211 and the second thread segment 212, respectively. The thread segment away from one end of the discharge port 11, that is, Figure 3 The first thread segment 211 shown in the figure can transport the cut wire 4 particles toward the discharge port 11, and synchronously move toward the discharge port 11 with the particles cut by the second thread segment 212, and thermoplastic deposition occurs during the friction between the end of the screw 2 and the substrate 6 and the plastic deformation between the particles to form an additive component.

[0057] In some embodiments, the thread direction, pitch and flight height of the thread of the first thread segment 211 are the same as those of the thread of the second thread segment 212 .

[0058] It can be understood that the thread of the first thread segment 211 has the same thread direction as that of the second thread segment 212, ensuring that the particles of the wire 4 are displaced in the same direction after cutting, and the thread of the first thread segment 211 has the same pitch and thread height as that of the second thread segment 212, thereby enabling uniform cutting of the wire 4, making the particles of the cut wire 4 equal in size, and avoiding the particles of the wire 4 being stuck in the gap of the thread and causing blockage.

[0059] In some examples, the number of thread turns may be 3-10, such as 3, 4, or 10, and the helix angle may be 10-50°, such as 10°, 11°, 50°, etc.

[0060] In some embodiments, the length of the first thread segment 211 is L1, the length of the second thread segment 212 is L2, and the length of the screw rod 2 is L, satisfying: L1≥0.3L, L2≥0.3L.

[0061] It can be understood that the lengths of the first thread segment 211 and the second thread segment 212 are limited within the above range to avoid the first thread segment 211 and the second thread segment 212 being too long or too short, thereby ensuring that the wire 4 can be fully cut and the cut wire 4 particles can fall smoothly to the discharge port 11.

[0062] In some examples, the length of the screw rod 2 is greater than 100 mm, and correspondingly, the lengths of the first thread segment 211 and the second thread segment 212 are both greater than 30 mm.

[0063] In some embodiments, Figure 3 As shown, a stirring needle 22 is also provided at the end of the screw 2 , and the stirring needle 22 extends out of the cavity from the discharge port 11 .

[0064] It can be understood that the wire 4 is cut by the first thread segment 211 and the second thread segment 212 of the screw 2. As the screw 2 rotates, the particles are driven to move toward the discharge port 11 and squeeze each other. When the particles move to the position of the discharge port 11, the cut wire 4 particles are thermoplastically deposited during the friction between the stirring needle 22 and the substrate 6 and the plastic deformation between the particles to form an additive component.

[0065] In some examples, the stirring needle 22 may be truncated cone-shaped, teardrop-shaped, or boss-shaped.

[0066] In some examples, the diameter of the stirring needle 22 is 1-10 mm, for example, 1 mm, 2 mm, 10 mm, etc.

[0067] In some embodiments, the length of the stirring needle 22 is L4, which satisfies: 1mm≤L4≤5mm.

[0068] It can be understood that if the stirring needle 22 is too short, the gap between the discharge port 11 and the substrate 6 will be small, affecting the particle discharge and further affecting the thermal deposition efficiency. If the stirring needle 22 is too long, the wire 4 particles cannot be fully rubbed and extruded, affecting the thermal deposition quality. Therefore, setting the length of the stirring needle 22 within the above range can better achieve the friction between the stirring needle 22 and the substrate 6 on the wire 4 particles.

[0069] In some embodiments, the shaft shoulder 1 further includes a clamping end 13 , and one end of the screw rod 2 away from the discharge port 11 extends out of the clamping end 13 and is coupled to a power source.

[0070] It can be understood that the power source provides cutting power for the screw 2 to achieve cutting of the wire 4, and the clamping end 13 is used to fix the shoulder 1 to prevent the shoulder 1 from shifting or shaking during the material addition process.

[0071] In some examples, the rotation speed of the screw 2 is 100 rpm-10000 rpm to achieve efficient cutting of the wire 4 and improve deposition efficiency.

[0072] 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 indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0073] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A friction stir additive device, characterized in that: include: A shaft shoulder, wherein a cavity is provided inside the shaft shoulder, and a discharge port is provided at one end of the shaft shoulder; A screw, the screw being arranged in the cavity, the screw comprising a first thread segment, a connecting segment and a second thread segment connected in sequence, the first thread segment and the second thread segment both being provided with threads, and the outer diameters of the first thread segment and the second thread segment both being larger than the outer diameter of the connecting segment; Wherein, a plurality of feed holes are opened on the side wall of the cavity, at least one feed hole faces the first thread segment, and at least one feed hole faces the second thread segment.

2. The friction stir additive device according to claim 1, characterized in that: The plurality of feed holes are spaced apart along the circumference of the shoulder.

3. The friction stir additive device according to claim 2, characterized in that: The distances between the plurality of feed holes and the end of the shaft shoulder are not equal.

4. The friction stir additive device according to claim 1, characterized in that: The axis of the feed hole intersects with the axis of the shaft shoulder and the angle formed away from the discharge port is an acute angle; the axis of the feed hole extends in a direction away from the shaft shoulder toward a direction away from the discharge port.

5. The friction stir additive device according to claim 1, characterized in that: The screw rod includes a rod body, one end of the rod body is provided with an external thread to form the first thread segment, the other end of the rod body is provided with an external thread to form the second thread segment, the first thread segment and the second thread segment are spaced apart along the axis of the screw rod, and the rod body between the first thread segment and the second thread segment forms the connecting segment.

6. The friction stir additive device according to claim 1, characterized in that: The thread direction, pitch and flight height of the thread of the first thread segment are the same as those of the thread of the second thread segment.

7. The friction stir additive device according to claim 6, characterized in that: The length of the first thread segment is L1, the length of the second thread segment is L2, and the length of the screw is L, satisfying: L1≥0.3L, L2≥0.3L.

8. The friction stir additive device according to claim 1, characterized in that: A stirring pin is also disposed at the end of the screw, and the stirring pin extends out of the cavity from the discharge port.

9. The friction stir additive device according to claim 8, characterized in that: The length of the stirring needle is L4, which satisfies: 1mm≤L4≤5mm.

10. The friction stir additive device according to claim 1, characterized in that: The shaft shoulder also includes a clamping end, and one end of the screw rod away from the discharge port extends out of the clamping end and is coupled to the power source.

Images