Friction stir additive manufacturing device and friction stir additive manufacturing method

Abstract

The present invention relates to the field of friction stir additive technology, and in particular to a friction stir additive manufacturing device and a friction stir additive manufacturing method, comprising a stirring component, a first upsetting component and a second upsetting component; the stirring component is provided with a friction portion and a receiving cavity, the receiving cavity comprises a mounting cavity and a feeding channel, and the feeding channel is connected to the friction portion; the first upsetting component is movably arranged in the mounting cavity, the first upsetting component is provided with a first upsetting surface, the first upsetting surface comprises an upsetting area and a mounting hole, the first upsetting surface and the mounting cavity wall are enclosed to form a material storage space, the material storage space comprises a first space and a second space, the first space cavity wall is provided with a feeding hole, an upsetting force is applied to the powder material through the upsetting area, and the second space is connected to the feeding channel; the second upsetting component is movably arranged in the mounting hole, the second upsetting component is provided with a second upsetting surface, and an upsetting force is applied to the powder material through the second upsetting surface. The present invention can realize continuous upsetting of powder materials, and has high product quality and high production efficiency.

Description

Technical Field

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

[0002] Additive manufacturing technology manufactures physical parts by gradually adding materials. With the development of the aerospace field, in order to meet the production needs of large and high-strength integral structural parts, stir friction additive manufacturing technology has been developed to achieve the manufacture of lightweight alloy structural parts such as aluminum and magnesium alloys.

[0003] Friction stir additive manufacturing technology is a solid-phase non-melting additive manufacturing method based on friction stir welding technology. It generates heat through the rotation and movement of the stirring head, causing the material to plastically deform and fuse together. In the process of additive manufacturing using friction stir additive manufacturing technology, defects such as pores and cracks generated during the melting and solidification process of traditional additive manufacturing methods can be avoided, ensuring that the additive area has good mechanical properties.

[0004] The materials used in the production process of friction stir additive manufacturing technology are different, and can be divided into plates, rods, wires and powders. Among them, since the performance of powder materials can be adjusted in a wider range, structural parts made of powder materials have good performance and a wider application space. However, in the existing technology, it is difficult for powder-based friction stir additive manufacturing devices to take into account both product quality and production efficiency. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the difficulty of existing stir friction additive manufacturing devices for powder materials in balancing product quality and production efficiency, and to provide a stir friction additive manufacturing device and a stir friction additive manufacturing method that can achieve continuous upsetting of powder materials, with high product quality and high production efficiency.

[0006] In the first aspect, the present invention provides a stir friction additive manufacturing device, comprising a stirring component, the stirring component is provided with a friction portion for stirring friction, the stirring component is provided with a accommodating cavity, the accommodating cavity includes a mounting cavity and a feeding channel, and the feeding channel is connected to the friction portion; a first upsetting forging, the first upsetting forging is movably arranged in the mounting cavity, the first upsetting forging is provided with a first upsetting surface, the first upsetting surface includes an upsetting area and a mounting hole located on the inner side of the upsetting area, the first upsetting surface and the cavity wall of the mounting cavity are enclosed to form a storage space, the storage space includes a first space corresponding to the upsetting area and a second space corresponding to the mounting hole, a feeding hole is provided on the cavity wall of the first space, for conveying powder material to the accommodating cavity through the feeding hole, for applying an upsetting force to the powder material through the upsetting area, and the second space is connected to the feeding channel; a second upsetting forging, the second upsetting forging is movably arranged in the mounting hole, the second upsetting forging is provided with a second upsetting surface, for applying an upsetting force to the powder material through the second upsetting surface.

[0007] In one embodiment of the present invention, the second upsetting surface is capable of entering the feed channel.

[0008] In one embodiment of the present invention, the area A1 of the upset zone and the area A2 of the second upset surface satisfy the relationship: A1=K*A2, wherein 0.2≤K≤2.

[0009] In one embodiment of the present invention, the upsetting speeds V of the first upsetting part and the second upsetting part are equal, satisfying the relationship: 20 mm / min≤V≤200 mm / min.

[0010] In one embodiment of the present invention, the material storage space is provided with a material feeding slope at one end close to the material feeding channel.

[0011] In one embodiment of the present invention, the feed hole is opened on the first forging surface.

[0012] In one embodiment of the present invention, a plurality of the feed holes are provided, and the plurality of the feed holes are arranged around the mounting hole; or the feed hole is provided as an annular hole, and is arranged outside the mounting hole.

[0013] In one embodiment of the present invention, the feeding end of the feeding hole is opened at an end of the first upset forging away from the friction portion.

[0014] In one embodiment of the present invention, a temperature control component is further included, and the temperature control component is configured to be able to adjust the temperature of the stirring component.

[0015] In a second aspect, the present invention further provides a friction stir additive manufacturing method based on the friction stir additive manufacturing device described in any one of the above items, comprising the following steps: S1, conveying powder material to the accommodating chamber through the feed hole; S2, applying an upsetting force to the powder material through the first upsetting forging and the second upsetting forging; S3, stirring and rubbing the powder material squeezed out of the feed channel through the friction part to realize additive manufacturing.

[0016] In one embodiment of the present invention, applying an upsetting force to the powder material through the first upsetting forging and the second upsetting forging includes: S21, applying an upsetting force to the powder material through the upsetting area and the second upsetting surface at the same time; S22, applying an upsetting force to the powder material in the feed channel through the second upsetting surface; the first upsetting forging moves to expand the volume of the first space, and conveys the powder material to the accommodating chamber through the feed hole; S23, applying an upsetting force to the powder material through the upsetting area.

[0017] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0018] The friction stir additive manufacturing device described in the present invention can achieve continuous upsetting of powder materials through the cooperation of the stirring component, the first upsetting piece and the second upsetting piece when performing friction stir additive manufacturing. First, the first upsetting piece and the second upsetting piece cooperate to apply upsetting force to the powder material, ensuring that the powder material is dense and improving the molding quality. Secondly, upsetting and feeding can be achieved under the premise of ensuring process continuity, further improving the molding quality and improving production efficiency. Finally, the powder material first enters the first space from the feed hole, and there is a feed channel between it and the friction part as a partition, which effectively avoids the blockage problem caused by the heat of the powder material and extends the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is one of the partial structural schematic diagrams of the friction stir additive manufacturing device in the preferred embodiment of the present invention;

[0021] Figure 2 It is one of the partial cross-sectional structural schematic diagrams of the stirring component in the preferred embodiment of the present invention;

[0022] Figure 3 It is one of the cross-sectional structural schematic diagrams of the first top forging surface in the preferred embodiment of the present invention;

[0023] Figure 4 The second schematic diagram of the cross-sectional structure of the first top forging surface in the preferred embodiment of the present invention;

[0024] Figure 5 It is one of the partial cross-sectional structural schematic diagrams of the friction stir additive manufacturing device in use in the preferred embodiment of the present invention;

[0025] Figure 6 The second schematic diagram of the partial cross-sectional structure of the friction stir additive manufacturing device in the preferred embodiment of the present invention when in use;

[0026] Figure 7 The third schematic diagram of the partial cross-sectional structure of the friction stir additive manufacturing device in use in the preferred embodiment of the present invention;

[0027] Figure 8 This is a fourth partial cross-sectional structural schematic diagram of the friction stir additive manufacturing device in use in a preferred embodiment of the present invention;

[0028] Fig. 9 This is a second schematic diagram of a partial cross-sectional structure of a stirring component in a preferred embodiment of the present invention;

[0029] Fig.10 This is the second partial structural schematic diagram of the friction stir additive manufacturing device in the preferred embodiment of the present invention.

[0030] Explanation of the reference numerals in the specification: 10, stirring component; 11, friction component; 12, accommodating chamber; 121, mounting chamber; 1211, first space; 1212, second space; 122, feeding channel; 123, feeding slope; 20, first upsetting part; 21, first upsetting surface; 211, upsetting area; 212, mounting hole; 22, feeding hole; 221, feeding end; 30, second upsetting part; 31, second upsetting surface; 40, powder material; 50, temperature control component. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] In the prior art, commonly used powder-based friction stir additive devices can be divided into two types according to whether they have a top forging or not. Among them, the powder-based friction stir additive device without a top forging is similar to the wire-based friction stir additive device, which is provided with a rotatable stirring rod in the stirring head, and a spiral groove is provided on the surface where the stirring rod contacts the stirring head. When performing friction stir additive manufacturing, powder is fed into the spiral groove to apply force to it by the spiral groove, so that the powder moves along the spiral groove and combines with the substrate to achieve additive manufacturing. This type of device can achieve continuous feeding, but due to the difference between powder and wire, the powder lacks the top forging force applied by the top forging and is not dense, which will lead to poor molding quality.

[0033] The friction stir additive device with a top forging includes a stirring head, which is hollow along its own axial direction to form a channel, and a single top forging is movably arranged in the channel, and a powder feeding hole is provided in the channel. When performing friction stir additive manufacturing, after the powder material is transported to the channel through the powder feeding hole, the top forging applies a top forging force to the powder material in the channel to compact and extrude the powder material. Under the action of the friction surface of the stirring head, the extruded powder material is combined with the substrate to achieve additive. Such a device can ensure that the powder material is relatively dense because it is provided with a top forging. However, it also has defects. According to the different positions of the powder feeding hole, such a device can be simply divided into two types: the powder feeding hole is close to the friction surface of the stirring head and the powder feeding hole is far away from the friction surface. When the powder feeding hole is far away from the friction surface of the stirring head, since the top forging needs to apply a top forging force to the powder material in the channel, after the powder material is compacted, the top forging has moved a certain distance relative to the powder feeding hole. When it is reset and replenished through the powder feeding hole, the force on the powder material is not continuous. This will lead to certain defects in the molding process, and it will take a certain amount of time to replenish the material, resulting in relatively low production efficiency. When the powder feeding hole is close to the friction surface of the stirring head, the above problems are relatively alleviated because the amount of powder required for the upsetting is relatively small and the moving distance is slightly shorter. However, when the friction surface realizes stir friction additive manufacturing of powder and substrate, it is easy for heat to affect the powder in the channel and powder feeding hole, causing blockage and other problems.

[0034] In order to solve the above problems, the present invention discloses a friction stir additive manufacturing device, including a stirring component 10, a first upset forging 20 and a second upset forging 30.

[0035] Reference Figure 1 and Figure 2 As shown, the stirring component 10 is used to achieve stirring friction between the powder material 40 and the substrate. Specifically, the stirring component 10 can rotate around its own rotation axis and can move relative to the substrate. How to achieve the rotation and movement of the stirring component 10 belongs to the prior art, and those skilled in the art can set it according to actual needs, such as by a combination of components such as a motor and a synchronous belt to achieve the rotation drive of the stirring component 10, and by setting up a mechanical arm, a three-axis drive and other devices to achieve the movement of the stirring component 10 relative to the substrate. The stirring component 10 is provided with a friction portion 11 for achieving stirring friction between the powder material 40 and the substrate. The friction portion 11 belongs to the prior art, and those skilled in the art can set a specific shape for it according to actual needs, such as a vortex shape, a key shape, etc.

[0036] Among them, a accommodating chamber 12 is opened in the stirring component 10, and the accommodating chamber 12 includes a mounting cavity 121 and a feeding channel 122. The mounting cavity 121 is used to set the corresponding top forging and powder material 40; the feeding channel 122 is connected with the friction part 11 to realize feeding. Preferably, the feeding channel 122 and the friction part 11 are both configured as axial cavities, and the two axes are parallel. Preferably, the axes of the two are coaxially configured. Preferably, the stirring component 10, the mounting cavity 121 and the feeding channel 122 are coaxial. The radial dimension of the feeding channel 122 is smaller than the radial dimension of the mounting cavity 121.

[0037] Reference Figure 1 and Figure 3 As shown, the first top forging 20 is used to cooperate with the second top forging 30 to apply a top forging force to the powder material 40. Specifically, the first top forging 20 is movably arranged in the installation cavity 121. Preferably, the first top forging 20 is arranged as a shaft-shaped structure, and the first top forging 20 and the stirring component 10 are arranged coaxially. Those skilled in the art can set the movement mode of the first top forging 20 according to actual needs, for example, by setting components such as cylinders and motors to realize its axial movement, realize the top forging movement or retraction movement of the powder material 40, and by setting devices such as mechanical arms and three-axis drives to realize the movement of the first top forging 20 relative to the substrate. Those skilled in the art can set the matching relationship between the radial side wall of the first top forging 20 and the cavity side wall of the installation cavity 121 according to actual needs, for example, the radial side wall of the first top forging 20 and the cavity side wall of the installation cavity 121 are set to be clearance-matched, or the two are set to a sliding sealing structure, etc.

[0038] Among them, the first upsetting forging piece 20 is provided with a first upsetting surface 21, and the first upsetting surface 21 and the cavity wall of the mounting cavity 121 are combined to form a material storage space to accommodate the powder material 40. Those skilled in the art can set the specific shape of the first upsetting surface 21 according to needs, such as round, square, triangular, etc. The first upsetting surface 21 includes an upsetting area 211 and a mounting hole 212 located on the inner side of the upsetting area 211. When performing additive manufacturing, an upsetting force is applied to the powder material 40 through the upsetting area 211; the mounting hole 212 is used to install the second upsetting forging piece 30. Accordingly, the material storage space can be divided into a first space 1211 and a second space 1212 arranged on the inner side of the first space 1211 according to the upsetting area 211 and the mounting hole 212. The first space 1211 corresponds to the upsetting area 211, and the second space 1212 corresponds to the mounting hole 212. Figure 1In the figure, the first space 1211 and the second space 1212 are separated by a dotted line. A feeding hole 22 is provided on the cavity wall of the first space 1211 to convey the powder material 40 to the accommodating cavity 12 through the feeding hole 22. Those skilled in the art can set the specific position of the feeding hole 22 according to actual needs, for example, setting it on the upset area 211, setting it on the stirring component 10, etc. Those skilled in the art can set the way in which the feeding hole 22 conveys the powder material 40 according to actual needs, for example, by conveying the powder material 40 with the assistance of a fluid, etc. The second space 1212 is connected to the feeding channel 122, so that the powder material 40 can be delivered to the friction part 11 to realize stir friction additive manufacturing.

[0039] The second upset forging 30 is used to cooperate with the first upset forging 20 to apply an upset force to the powder material 40. Specifically, the second upset forging 30 is movably arranged in the mounting hole 212. Preferably, the second upset forging 30 is arranged as a shaft-shaped structure, and the second upset forging 30 and the first upset forging 20 are arranged coaxially. Those skilled in the art can set the movement mode of the second upset forging 30 according to actual needs, for example, by setting components such as a cylinder and a motor to realize its axial movement, realize the upset movement or retraction movement of the powder material 40, and by setting a mechanical arm, a three-axis drive and other devices to realize the movement of the second upset forging 30 relative to the substrate. Those skilled in the art can set the matching relationship between the radial side wall of the second upset forging 30 and the hole wall of the mounting hole 212 according to actual needs, for example, the radial side wall of the second upset forging 30 and the hole wall of the mounting hole 212 are set to be clearance-matched, or the two are set to a sliding sealing structure, etc.

[0040] The second upsetting forging piece 30 is provided with a second upsetting surface 31. Those skilled in the art can set a specific shape of the second upsetting surface 31 according to actual needs, such as round, square, triangular, etc. During additive manufacturing, the second upsetting surface 31 applies an upsetting force to the powder material 40.

[0041] Preferably, when performing friction stir additive manufacturing, first, refer to Figure 5 As shown, the stirring component 10 is moved to a corresponding position of the substrate, and the powder material 40 is transported to the material storage space and the material supply channel 122 through the material supply hole 22 .

[0042] Secondly, refer to Figure 6 As shown, the feed hole 22 stops feeding the powder material 40 into the storage space and the feed channel 122, and at the same time, the first upset forging 20 and the second upset forging 30 move together toward the side where the substrate is located, so as to upset the powder material 40 located in the storage space and the feed channel 122, apply upset force to the powder material 40, ensure that the powder material 40 is dense, thereby ensuring high production efficiency and high molding quality. Preferably, the powder material 40 is not replenished at this time. Preferably, the upset area 211 and the second upset surface 31 are parallel at this time.

[0043] Then, refer to Figure 7 As shown, after the first upset forging 20 and the second upset forging 30 move a certain distance, the second upset forging 30 continues to move toward the side where the substrate is located to upset the powder material 40; at the same time, the first upset forging 20 retreats to the side away from the substrate to expand the volume of the first space 1211; preferably, at this time, the powder material 40 is transported to the storage space and the feed channel 122 through the feed hole 22.

[0044] Then, refer to Figure 8 As shown, the second upset forging 30 retreats to the side away from the substrate, while the first upset forging 20 moves to the side where the substrate is located, so as to achieve continuous upset forging of the powder material 40. Preferably, at this time, the powder material 40 continues to be transported into the storage space and the feeding channel 122 through the feeding hole 22.

[0045] The corresponding actions are repeated, and the powder material 40 that is squeezed out of the feeding channel 122 by upsetting is fused with the base material under the action of the friction part 11 of the stirring component 10 to realize additive manufacturing.

[0046] The friction stir additive manufacturing device described in the present invention can achieve continuous upsetting of the powder material 40 through the cooperation of the stirring component 10, the first upsetting forging 20 and the second upsetting forging 30 when performing friction stir additive manufacturing. First, the first upsetting forging 20 and the second upsetting forging 30 cooperate to apply an upsetting force to the powder material 40, ensuring that the powder material 40 is dense and improving the molding quality. Secondly, it is possible to achieve upsetting and feeding while ensuring process continuity, further improving the molding quality while improving production efficiency. Finally, the powder material 40 first enters the first space 1211 from the feed hole 22, and there is a feed channel 122 between it and the friction part 11 as a partition, which effectively avoids the blockage problem caused by the heat of the powder material 40 and extends the service life of the device.

[0047] In the friction stir additive manufacturing device of the present invention, in some embodiments, the second upsetting surface 31 of the second upsetting piece 30 can enter the feed channel 122. Preferably, the radial side wall of the second upsetting piece 30 and the channel side wall of the feed channel 122 are set to be clearance-matched, or both are set to a sliding sealing structure, etc. By setting this structure, under the premise of continuous upsetting, the second upsetting surface 31 can directly apply an upsetting force to the powder 40 located in the feed channel 122, thereby further improving the upsetting effect.

[0048] In the friction stir additive manufacturing device of the present invention, in some embodiments, the area A1 of the upset zone 211 and the area A2 of the second upset surface 31 satisfy the relationship:

[0049] A1=K*A2,

[0050] Among them, 0.2≤K≤2. Specifically, when K is greater than 2, the area A1 of the upset zone 211 is relatively large, and the area A2 of the second upset surface 31 is relatively small, and the requirement for the upset speed becomes higher, so that the rhythm of the alternating movement of the first upset 20 and the second upset 30 must be accelerated to achieve continuous upset forging of the powder 40. This makes the upset speed of both too fast, causing the upset powder 40 to be not dense enough, with air inclusions, causing additive defects. When K is less than 0.2, the volume of the first space 1211 is small, which will affect the efficiency of conveying the powder 40, and it is easy to get stuck. When 0.2≤K≤2, the powder 40 can be smoothly fed at a suitable speed, taking into account both high production efficiency and high molding quality. Those skilled in the art can set a specific value of K according to actual needs, such as 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc. Preferably, the value of K is set to 1 to achieve the best effect.

[0051] In some embodiments of the friction stir additive manufacturing device of the present invention, the upsetting speeds V of the first upsetting part 20 and the second upsetting part 30 are equal (unit: millimeter per minute, mm / min), satisfying the relationship:

[0052] 20mm / min≤V≤200mm / min.

[0053] Specifically, when V is less than 20 mm / min, the feeding efficiency is low, which can easily reduce the overall additive manufacturing efficiency. When V is greater than 200 mm / min, the upsetting speed is too fast, causing the powder material 40 to be upset not to be dense enough, and there are air inclusions, which cause additive defects. When 20 mm / min≤V≤200 mm / min, high production efficiency and high molding quality can be taken into account. Those skilled in the art can set a specific V value according to actual needs, such as 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, etc. Preferably, the first upsetting forging 20 and the second upsetting forging 30 simultaneously meet the limitations of area and upsetting speed to ensure the best effect.

[0054] Reference Fig. 9 As shown, in the friction stir additive manufacturing device of the present invention, in some embodiments, a feeding slope 123 is provided at one end of the material storage space near the feeding channel 122. By providing the feeding slope 123, the powder material 40 in the material storage space can be easily fed into the feeding channel 122, thereby improving production efficiency. At the same time, it can also effectively prevent the powder material 40 from accumulating in the corner of the material storage space.

[0055] In the friction stir additive manufacturing device of the present invention, in some embodiments, the feed hole 22 is provided on the first upsetting surface 21. By providing the feed hole 22 on the first upsetting surface 21, it is ensured that the feed hole 22 can move with the first upsetting piece 20, so that the powder material 40 can be more conveniently transported into the material storage space and the feed channel 122, thereby improving production efficiency. Those skilled in the art can set the shape of the feed hole 22 according to actual needs, such as a round hole, a square hole, a triangular hole, an annular hole, etc.

[0056] Preferably, refer to Figure 3 and Fig.10 As shown, in the friction stir additive manufacturing device of the present invention, in some embodiments, a plurality of feed holes 22 are provided, and the plurality of feed holes 22 are arranged around the mounting hole 212. By setting up this structure, it can be effectively ensured that when the powder material 40 is conveyed, the powder material 40 can enter the corresponding position of the storage space through the feed hole 22, and will not be accumulated in a certain place, which effectively avoids the occurrence of the problem of blockage of the powder material 40 and improves the production efficiency. Preferably, the plurality of feed holes 22 are evenly spaced in sequence along the circumferential direction of the mounting hole 212 to achieve the best effect.

[0057] Preferably, refer to Figure 4 As shown, in the friction stir additive manufacturing device described in the present invention, in some embodiments, the feed hole 22 is set as an annular hole, and it is arranged on the outside of the mounting hole, which can also avoid the problem of clogging of the powder material 40.

[0058] Reference Fig.10 As shown, in the friction stir additive manufacturing device of the present invention, in some embodiments, the feed end 221 of the feed hole 22 is opened at the end of the first upset 20 away from the friction part 11. By limiting the position of the feed end 221 of the feed hole 22, on the one hand, it is convenient to cooperate with other components to realize the transportation of the powder material 40; on the other hand, it can effectively prevent the blockage problem caused by heat during the transportation of the powder material 40, which not only ensures the high quality of the cost, but also improves the production efficiency.

[0059] Reference Fig.10 As shown, the stir friction additive manufacturing device of the present invention, in some embodiments, further includes a temperature control component 50, which is configured to be able to adjust the temperature of the stirring component 10. Those skilled in the art can provide a corresponding temperature control component 50, such as a water cooler, according to actual needs, and the working principle of the temperature control component 50 will not be described in detail. By providing the temperature control component 50, the heat generated by the friction part 11 can be effectively prevented from being transferred to the material storage space, thereby avoiding the problem of the powder material 40 being heated and causing blockage therein.

[0060] The present invention discloses a friction stir additive manufacturing method based on the friction stir additive manufacturing device described in any one of the above embodiments, comprising the following steps:

[0061] S1, conveying powder material 40 to the containing chamber 12 through the feeding hole 22;

[0062] S2, applying an upsetting force to the powder material 40 through the first upsetting piece 20 and the second upsetting piece 30;

[0063] S3, the friction part 11 stirs and rubs the powder material 40 squeezed out of the feeding channel 122 to achieve additive manufacturing.

[0064] Those skilled in the art can set the order in which the first upset forging piece 20 and the second upset forging piece 30 apply the upset force according to actual needs, as long as continuous upset forging of the powder material 40 can be achieved.

[0065] Preferably, in the friction stir additive manufacturing method of the present invention, in some embodiments, applying an upsetting force to the powder material 40 by the first upsetting forging 20 and the second upsetting forging 30 includes:

[0066] S21, applying an upsetting force to the powder material 40 through the upsetting area 211 and the second upsetting surface 31 at the same time;

[0067] S22, applying an upsetting force to the powder material 40 in the feeding channel 122 through the second upsetting surface 31; the first upsetting member 20 moves to expand the volume of the first space 1211, and the powder material 40 is transported to the accommodating cavity 12 through the feeding hole 22;

[0068] S23 , the second upsetting piece 30 moves so that the second upsetting surface 31 enters the second space 1212 , and applies an upsetting force to the powder material 40 through the upsetting area 211 .

[0069] Working principle:

[0070] A stir friction additive manufacturing device with an area of ​​the upset zone 211 equal to that of the second upset surface 31 is selected, and it is moved to the corresponding position of the substrate through a corresponding device, and the powder material 40 is conveyed into the storage space and the feeding channel 122 through the feeding hole 22. After the conveying of the powder material 40 is completed, the conveying is stopped; the first upset forging 20 and the second upset forging 30 are synchronously moved toward the side where the substrate is located to upset the powder material 40 located in the storage space and the feeding channel 122, and an upset force is applied to the powder material 40 to ensure that the powder material 40 is dense.

[0071] After the first upset forging 20 and the second upset forging 30 move a certain distance, the second upset forging 30 continues to move in the same direction to upset the powder material 40; the first upset forging 20 moves away from the substrate to expand the volume of the first space 1211. At the same time, the powder material 40 is transported into the material storage space and the feed channel 122 through the feed hole 22. The upset speeds of the first upset forging 20 and the second upset forging 30 are equal.

[0072] Subsequently, the second upsetting piece 30 retreats to the side away from the substrate, while the first upsetting piece 20 moves to the side where the substrate is located, so as to realize continuous upsetting of the powder material 40. At the same time, the powder material 40 is transported into the material storage space and the material feeding channel 122 through the feed hole 22. The upsetting speeds of the first upsetting piece 20 and the second upsetting piece 30 are equal.

[0073] The corresponding actions are repeated, and the powder material 40 that is squeezed out of the feed channel 122 by upsetting is fused with the base material under the action of the friction part 11 of the stirring component 10 to realize additive manufacturing. At the same time, the temperature of the stirring component 10 is regulated by the temperature control component 50 to ensure that the powder material 40 in the feed channel 122 can be cold pressed.

[0074] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A friction stir additive manufacturing device, characterized in that: include: A stirring component, wherein the stirring component is provided with a friction portion for stirring and rubbing, and a receiving cavity is provided in the stirring component, wherein the receiving cavity includes a mounting cavity and a feeding channel, and the feeding channel is connected with the friction portion; a first upset forging, the first upset forging being movably disposed in the installation cavity, a first upset surface being provided on the first upset forging, the first upset surface comprising an upset area and an installation hole located inside the upset area, the first upset surface and the cavity wall of the installation cavity enclosing a material storage space, the material storage space comprising a first space corresponding to the upset area and a second space corresponding to the installation hole, a feeding hole being provided on the cavity wall of the first space, for conveying powder material to the accommodating cavity through the feeding hole, for applying an upset force to the powder material through the upset area, and the second space being connected to the feeding channel; a second upsetting forging, wherein the second upsetting forging is movably disposed in the mounting hole, and a second upsetting surface is provided on the second upsetting forging to apply an upsetting force to the powder material through the second upsetting surface; Wherein, continuous upsetting of the powder material is achieved through the cooperation of the stirring component, the first upsetting piece and the second upsetting piece.

2. The friction stir additive manufacturing device according to claim 1, characterized in that: The second upsetting surface is capable of entering the feed channel.

3. The friction stir additive manufacturing device according to claim 1, characterized in that: The area of ​​the upset zone and the area of ​​the second top forging surface Satisfies the relationship: ， in, .

4. The friction stir additive manufacturing device according to claim 1 or 3, characterized in that: Upsetting speeds of the first upsetting part and the second upsetting part Equal, satisfying the relationship: 。 5. The friction stir additive manufacturing device according to claim 1, characterized in that: The material storage space is provided with a material feeding slope at one end close to the material feeding channel.

6. The friction stir additive manufacturing device according to claim 1, characterized in that: The feed hole is opened on the first forging surface.

7. The friction stir additive manufacturing device according to claim 6, characterized in that: There are multiple feed holes, and the multiple feed holes are arranged around the mounting hole; or The feeding hole is configured as an annular hole and is arranged outside the mounting hole.

8. The friction stir additive manufacturing device according to claim 6: the feed end of the feed hole is opened at an end of the first upset forging away from the friction part.

9. The friction stir additive manufacturing device according to claim 1 or 8, characterized in that: A temperature control component is also included, and the temperature control component is configured to be able to adjust the temperature of the stirring component.

10. A friction stir additive manufacturing method based on the friction stir additive manufacturing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, conveying powder material to the containing cavity through the feeding hole; S2, applying an upsetting force to the powder material through the first upsetting piece and the second upsetting piece; S3, stirring and rubbing the powder material extruded out of the feeding channel by the friction part to realize additive manufacturing.

11. The friction stir additive manufacturing method according to claim 10, characterized in that: Applying an upsetting force to the powder material by using the first upsetting part and the second upsetting part comprises: S21, applying an upsetting force to the powder material through the upsetting area and the second upsetting surface at the same time; S22, applying an upsetting force to the powder material in the feeding channel through the second upsetting surface; the first upsetting member moves to expand the volume of the first space, and the powder material is transported to the accommodating cavity through the feeding hole; S23, applying an upsetting force to the powder material through the upsetting zone.

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