Continuous friction stirring additive manufacturing device for alternately pushing rods and use method

Abstract

The present invention discloses a continuous friction stir additive manufacturing device for alternately pushing rods and a method for using the device, comprising: a frame, two clamping and feeding mechanisms, four ball screws and a tool head, three baffles are fixedly mounted on the frame, the three baffles are parallel to each other and arranged in the vertical direction, a clamping and feeding mechanism is arranged between every two adjacent baffles; the screws of the four ball screws are arranged in the vertical direction and pass through the two clamping and feeding mechanisms and the three baffles, and the rods pass through the two clamping and feeding mechanisms and the three baffles in the vertical direction; a clamping claw is installed on the clamping and feeding mechanism. During the friction stir additive manufacturing process, the continuous friction stir additive manufacturing device of the present invention completes the uninterrupted and continuous feeding of the rods through the alternate clamping and pushing of the two clamping and feeding mechanisms, thereby achieving the continuity, uniformity and stability of the friction stir additive manufacturing process.

Description

Technical Field

[0001] The present invention belongs to the technical field of friction additive manufacturing, and in particular relates to a continuous stirring friction additive manufacturing device for alternately pushing rods and a method for using the device. Background Art

[0002] Friction stir additive manufacturing is a new solid-phase additive manufacturing method. It relies on the shoulder tool to convey and drive the material to rotate at high speed, and under the action of axial thrust, the material and the workpiece surface are rubbed to generate heat, so that the material is plastically deformed and then forms a deposition layer. It has broad application prospects in aerospace, rail vehicles and other fields. There are many ways to implement friction stir additive manufacturing, mainly in the form of powder, wire, strip, and bar feeding. Compared with the friction stir additive manufacturing of powder, wire, and strip feeding, the method of using rods for friction stir additive manufacturing greatly reduces the difficulty of feeding. The bar feeding relies on the shoulder tool to drive the bar to rotate at high speed, and under the action of axial feeding thrust, the friction stir additive manufacturing with the substrate generates heat, so that the bar reaches a thermoplastic flow state, and the feeding process is easy to implement. Compared with the feeding method of powder, wire, and strip, the friction stir additive manufacturing of bar feeding has the advantages of high efficiency and strong material applicability. The raw materials can be processed into bars without further preparation into powder, wire, strip, etc.

[0003] Although bar-fed FSM has great advantages, the current technology is still subject to many limitations, among which the problems that need to be solved are:

[0004] 1. How to achieve continuous feeding of rods. During the friction stir additive manufacturing process, the rods must rotate at high speed and be fed axially, which involves the movement of the rods in two directions. Most of the existing friction stir additive manufacturing processes using rod feeding are discontinuous feeding methods. In addition, when the rods are consumed, the machine needs to be stopped and replaced with new rods before the friction stir additive manufacturing can continue, which seriously affects the efficiency. Moreover, after the machine is stopped to replace the rods and restart, defects are easily generated at the connection position due to the interruption of the process. Therefore, discontinuous feeding seriously reduces the efficiency of friction stir additive manufacturing, and there is an urgent need for a device that can achieve continuous rod feeding to solve the above problems.

[0005] 2. In order to make the bar material rotate synchronously with the shoulder tool, the side of the bar material is required to have at least one flat surface, and the corresponding feeding channel must also have a corresponding shape, which greatly restricts the shape of the bar material. For example, aluminum-based composite materials, titanium alloys and other materials on the market are mostly plates and bars. In order to meet the bar shape of stir friction additive manufacturing, it is often necessary to further machine the existing plates or bars so that the side of the bar material has at least one flat surface, which requires a lot of work in bar machining. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a continuous friction stir additive manufacturing device for alternately pushing rods, wherein the continuous friction stir additive manufacturing device can realize friction stir additive manufacturing by continuously feeding rods.

[0007] Another object of the present invention is to provide a method for using the above-mentioned continuous stir friction additive manufacturing device.

[0008] The present invention is achieved through the following technical solutions.

[0009] A continuous friction stir additive manufacturing device for alternately pushing rod materials comprises: a frame, two clamping and feeding mechanisms, four vertically arranged ball screws, a tool head, a first motor and a plurality of first guide pillars, three baffles are fixedly mounted on the frame, the baffles are horizontally arranged, the three baffles are parallel to each other and arranged in the vertical direction, and one clamping and feeding mechanism is arranged between every two adjacent baffles; each baffle comprises: a first frame body and a first rotating body, the first frame body is used to be fixedly mounted with the frame, the first rotating body is embedded in the first frame body and a first bearing is installed between the first frame body, so that the first rotating body can rotate on the first frame body;

[0010] Each clamping and feeding mechanism comprises: a second frame and a second rotating body, wherein the second rotating body is embedded in the second frame and a second bearing is installed between the second frame so that the second rotating body can rotate on the second frame; the second rotating body is arranged in parallel with the first rotating body;

[0011] The screw rods of the four ball screws are all arranged in the vertical direction and pass through the second frames of the two clamping and feeding mechanisms and the first frames of the three baffles. The two clamping and feeding mechanisms are, from top to bottom, the first clamping and feeding mechanism and the second clamping and feeding mechanism. The nuts of the two ball screws are fixedly mounted on the first clamping and feeding mechanism and are not connected to the second clamping and feeding mechanism. The nuts of the other two ball screws are fixedly mounted on the second clamping and feeding mechanism and are not connected to the first clamping and feeding mechanism.

[0012] The bar material passes through the axis of the second rotating body and the axis of the first rotating body in the vertical direction;

[0013] A clamping claw is installed on the second rotating body for clamping the bar material;

[0014] The tool head comprises: a spindle rotating body, a tool handle connecting structure, a spindle housing and a shoulder tool, wherein the tool handle connecting structure is fixedly mounted in the spindle rotating body and is coaxially arranged in the spindle rotating body, the spindle rotating body is fixedly mounted to the first rotating body of the baffle located at the bottom, the spindle housing is fixedly mounted to the frame, the spindle housing is sleeved outside the spindle rotating body and a third bearing is installed between the spindle rotating body and the spindle rotating body, the shoulder tool is fixedly mounted at the lower end of the tool handle connecting structure, and the bar material passes through the tool handle connecting structure and the shoulder tool along the axis of the tool handle connecting structure and the axis of the shoulder tool;

[0015] Each first guide post is arranged in a vertical direction, and a plurality of first guide posts pass through the first rotating body and the second rotating body;

[0016] The first motor is used to drive the main shaft rotating body to rotate, so that the main shaft rotating body, the first rotating body and the second rotating body rotate at the same speed.

[0017] In the above technical solution, the clamping claw comprises: a clamping claw body, a second through hole for passing the bar is formed in the second rotating body, two cavities are formed in the second rotating body, the two cavities are symmetrically arranged with the second through hole as the center line, each of the cavities comprises: a fixing member, a first piston, a second piston and a third piston, the fixing member is fixed in the cavity and forms an annular channel in the cavity space;

[0018] Each annular channel is connected to the second through hole through a first channel, a claw body is disposed in each cavity, the claw body is disposed along the radial direction of the second rotating body, the outer end of the claw body is located in the cavity, and the inner end of the claw body passes through the first channel; the height of the first channel is greater than the height of the claw body;

[0019] The first piston, the second piston and the third piston are arranged at intervals and limited in the annular channel, the first piston and the second piston are respectively fixed to the claw body located in the cavity, the first piston is located above the claw body, and the second piston is located below the claw body, the first piston, the second piston and the third piston divide the annular channel into a first space and a second space that are not connected to each other, and the first space and the second space are respectively filled with a pressure transmission medium, wherein a side of the fixing member close to the second through hole is formed with an inclined surface, an outer end surface of the claw body is in contact with the inclined surface, and the third piston is fixed with a push rod, and the third piston is driven by the push rod to move along the annular channel so that the first piston and the second piston move along the annular channel, and the claw body is driven to slide along the inclined surface, when the claw body slides on the inclined surface to the position closest to the second through hole, the inner end surface of the claw body protrudes from the side wall of the second through hole, and when the claw body slides on the inclined surface to the position farthest from the second through hole, the inner end surface of the claw body does not protrude from the side wall of the second through hole.

[0020] In the above technical solution, four ball screws are arranged along a matrix.

[0021] In the above technical solution, a groove is formed on the inclined surface, and the outer end surface of the claw body is in contact with the bottom of the groove, and the groove is used to limit the sliding range of the claw body along the inclined surface.

[0022] In the above technical solution, the two ball screws corresponding to the nuts fixed to the first clamping and feeding mechanism are located on the diagonal lines of the matrix.

[0023] In the above technical solution, the two ball screws corresponding to the nuts fixed to the second clamping and feeding mechanism are located on the diagonal lines of the matrix.

[0024] In the above technical solution, the push rod is vertically arranged, and the push rod passes through the second rotating body and the cavity therein. The upper end and the lower end of the push rod respectively protrude from the second rotating body. The length of the push rod in the two cavities in the same second rotating body is the same, and the distance between the inclined surfaces of the fixing parts in the two cavities in the same second rotating body gradually decreases from bottom to top.

[0025] In the above technical solution, a first through hole for passing the bar is formed in the first rotating body, and a gap between a side wall of the first through hole and the bar is 0.2-0.5 mm.

[0026] In the above technical solution, the gap between the side wall of the second through hole and the rod material is 0.2-0.5 mm.

[0027] In the above technical solution, the clamping claw bodies of the first clamping and feeding mechanism and the second clamping and feeding mechanism are arranged alternately.

[0028] In the above technical solution, the angle between the straight line where the main body of the clamping claw of the first clamping and feeding mechanism is located and the straight line where the main body of the clamping claw of the second clamping and feeding mechanism is located is 90°.

[0029] In the above technical solution, the angle between the inclined surface and the axial direction of the second through hole is 10-30°.

[0030] In the above technical solution, the screw of each ball screw is driven by a second motor, and the second motor is fixed on the frame.

[0031] In the above technical solution, the lower end of the screw of each ball screw is mounted on the frame and is rotatably connected to the frame.

[0032] A method for using a continuous friction stir additive manufacturing device comprises the following steps:

[0033] S1, loosen the clamping claw of the feeding mechanism, and allow the bar to pass through the second rotating body, the first rotating body, the tool holder connecting structure and the shoulder tool; adjust the distance between the bottom surface of the shoulder tool and the surface of the workpiece on which the deposition layer is to be deposited;

[0034] S2, make the claws of at least one clamping and feeding mechanism clamp the bar material, the first motor drives the main shaft rotating body to rotate, so that the main shaft rotating body, the first rotating body, the second rotating body, the shoulder tool, the tool holder connecting structure and the bar material rotate at the same speed, while the main shaft rotating body rotates, the continuous stir friction additive manufacturing device that alternately pushes the bar material to feed the material: make the claws of at least one clamping and feeding mechanism clamp the bar material, and make the ball screw corresponding to the clamping and feeding mechanism that clamps the bar material move, so that the clamping and feeding mechanism that clamps the bar material drives the bar material to move downward, in the process of feeding the continuous stir friction additive manufacturing device that alternately pushes the bar material, the two clamping and feeding mechanisms relay to clamp the bar material and drive the bar material to move downward.

[0035] The beneficial effects of the present invention are as follows:

[0036] 1. During the friction stir additive manufacturing process, the continuous friction stir additive manufacturing device of the present invention completes the uninterrupted and continuous feeding of rod materials through the alternating pushing of two clamping and feeding mechanisms, thereby achieving the continuity, uniformity and stability of the friction stir additive manufacturing process.

[0037] 2. The continuous stir friction additive manufacturing device of the present invention has no restrictions on the shape of the rod, can be compatible with rods of more cross-sectional shapes, and has wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a continuous friction stir additive manufacturing device for alternately pushing rods;

[0039] Figure 2 A top view of a baffle in a continuous friction stir additive manufacturing device for alternately pushing rods;

[0040] Figure 3 for Figure 2 Sectional view of the AA plane;

[0041] Figure 4 A top view of a clamping and feeding mechanism in a continuous friction stir additive manufacturing device for alternately pushing rods;

[0042] Figure 5 for Figure 4 Sectional view of the middle BB plane;

[0043] Figure 6 is a cross-sectional view of the tool head;

[0044] Figure 7 This is a schematic diagram of the structure of the clamping claw (the clamping claw is clamping the bar);

[0045] Figure 8 This is a schematic diagram of the structure of the clamping jaws (the clamping jaws are loose and not clamping the bar);

[0046] Among them, 1: frame, 2: clamping and feeding mechanism, 2-1: second frame, 2-2: claw body, 2-3: second rotating body, 2-4: second bearing, 2-5: second through hole, 2-6: cavity, 2-7: first channel, 2-8: fixing part, 2-9: first piston, 2-10: second piston, 2-11: third piston, 2-12: groove, 2-13: push rod, 3: ball screw, 3-1: screw, 3-2: nut, 3-3: second motor, 4: baffle, 4-1: first frame, 4-2: first rotating body, 4-3: first bearing, 4-4: first through hole, 5: bar, 6: tool head, 6-1: spindle rotating body, 6-2: tool handle connecting structure, 6-3: spindle housing, 6-4: shoulder tool, 6-5: third bearing. DETAILED DESCRIPTION

[0047] The continuous friction stir additive manufacturing device for alternately pushing rods of the present invention is described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0048] As attached Figures 1 to 8 As shown, a continuous friction stir additive manufacturing device for alternately pushing rod materials comprises: a frame 1, two clamping and feeding mechanisms 2, four vertically arranged ball screws 3, a tool head 6, a first motor (not shown in the figure) and a plurality of first guide pillars, three baffles 4 are fixedly mounted on the frame 1, the baffles 4 are horizontally arranged, the three baffles 4 are parallel to each other and arranged in the vertical direction, and a clamping and feeding mechanism 2 is arranged between every two adjacent baffles 4; Figure 2~3As shown, each baffle 4 includes: a first frame 4-1 and a first rotating body 4-2, the first frame 4-1 is used to be fixed to the frame 1, the first rotating body 4-2 is embedded in the first frame 4-1 and a first bearing 4-3 is installed between the first frame 4-1 so that the first rotating body 4-2 can rotate on the first frame 4-1.

[0049] like Figures 4 and 5 As shown, each clamping feeding mechanism 2 includes: a second frame 2-1 and a second rotating body 2-3, the second rotating body 2-3 is embedded in the second frame 2-1 and a second bearing 2-4 is installed between the second frame 2-1, so that the second rotating body 2-3 can rotate on the second frame 2-1; the second rotating body 2-3 and the first rotating body 4-2 are arranged in parallel;

[0050] The screw rods 3-1 of the four ball screws 3 are all arranged in the vertical direction and pass through the second frames 2-1 of the two clamping and feeding mechanisms 2 and the first frames 4-1 of the three baffles 4. The two clamping and feeding mechanisms 2 are, from top to bottom, the first clamping and feeding mechanism and the second clamping and feeding mechanism. The nuts 3-2 of the two ball screws 3 are fixedly mounted on the first clamping and feeding mechanism and are not connected to the second clamping and feeding mechanism. The nuts 3-2 of the other two ball screws 3 are fixedly mounted on the second clamping and feeding mechanism and are not connected to the first clamping and feeding mechanism.

[0051] The rod 5 passes through the axis of the second rotating body 2-3 and the axis of the first rotating body 4-2 in the vertical direction; the cross-sectional shape of the rod 5 is rectangular, circular or polygonal.

[0052] A clamping claw is installed on the second rotating body 2-3 for clamping the bar 5;

[0053] like Figure 6 As shown, the tool head 6 includes: a spindle rotating body 6-1, a tool handle connecting structure 6-2, a spindle housing 6-3 and a shoulder tool 6-4, the tool handle connecting structure 6-2 is fixedly installed in the spindle rotating body 6-1 and is coaxially arranged with the spindle rotating body 6-1, the spindle rotating body 6-1 is fixedly installed with the first rotating body 4-2 located at the lowermost baffle 4, the spindle housing 6-3 is fixedly installed with the frame 1, the spindle housing 6-3 is sleeved outside the spindle rotating body 6-1 and a third bearing 6-5 is installed between the spindle housing 6-3 and the spindle rotating body 6-1, the shoulder tool 6-4 is fixedly installed at the lower end of the tool handle connecting structure 6-2, and the bar 5 passes through the tool handle connecting structure 6-2 and the shoulder tool 6-4 along the axis of the tool handle connecting structure 6-2 and the axis of the shoulder tool 6-4;

[0054] Each first guide column is arranged in the vertical direction, and the plurality of first guide columns pass through the first rotating body 4-2 and the second rotating body 2-3;

[0055] The first motor is used to drive the main shaft rotating body 6-1 to rotate, so that the main shaft rotating body 6-1, the first rotating body 4-2 and the second rotating body 2-3 rotate at the same speed. The first motor can indirectly drive the main shaft rotating body 6-1 to rotate through a belt drive.

[0056] The method for using the above-mentioned continuous friction stir additive manufacturing device for alternately pushing rods comprises the following steps:

[0057] S1, loosen the clamping claw of the feeding mechanism 2, and allow the bar 5 to pass through the second rotating body 2-3, the first rotating body 4-2, the tool holder connecting structure 6-2 and the shoulder tool 6-4; adjust the distance between the bottom surface of the shoulder tool 6-4 and the surface of the workpiece to be deposited with the deposition layer;

[0058] S2, make the claws of at least one clamping and feeding mechanism 2 clamp the bar 5, the first motor drives the main shaft rotating body 6-1 to rotate, so that the main shaft rotating body 6-1, the first rotating body 4-2, the second rotating body 2-3, the shoulder tool 6-4, the tool handle connecting structure 6-2 and the bar 5 rotate at the same speed, while the main shaft rotating body 6-1 rotates, the continuous stir friction additive manufacturing device that pushes the bar alternately to feed: make the claws of at least one clamping and feeding mechanism 2 clamp the bar 5, and make the ball screw 3 corresponding to the clamping and feeding mechanism 2 that clamps (clamps) the bar 5 move, so that the clamping and feeding mechanism 2 that clamps the bar 5 drives the bar 5 to move downward. In the process of feeding the continuous stir friction additive manufacturing device that alternately pushes the bar, the two clamping and feeding mechanisms 2 relay to clamp the bar 5 and drive the bar 5 to move downward, so as to complete uninterrupted and continuous feeding. In the above process, the bar 5 rotates at a high speed, and under the axial thrust of the clamping and feeding mechanism 2, the bar 5 generates heat by friction with the workpiece surface, causing the bar 5 to undergo large plastic deformation and thus form a deposition layer.

[0059] During the feeding process of the bar 5, the axial force is provided by the first clamping feeding mechanism and the second clamping feeding mechanism moving downward along the screw 3-1 of the ball wire. The claws of the clamping feeding mechanism 2 drive the bar 5 to rotate synchronously. Under the action of the feeding axial force and rotation, the bar 5 generates heat by friction with the workpiece surface and reaches a thermoplastic flow state, forming a deposition layer. Example 2

[0060] A continuous friction stir additive manufacturing device for alternately pushing rods, such as Figure 5 , Figure 7-8As shown, on the basis of Example 1, the claw includes: a claw body 2-2, a second through hole 2-5 for passing the rod 5 is formed in the second rotating body 2-3, and two cavities 2-6 are formed in the second rotating body 2-3, and the two cavities 2-6 are symmetrically arranged with the second through hole 2-5 as the center line, and each cavity 2-6 includes: a fixing member 2-8, a first piston 2-9, a second piston 2-10 and a third piston 2-11, the fixing member 2-8 is fixed in the cavity 2-6 and forms an annular channel in the space of the cavity 2-6; each annular channel is connected with the second through hole 2-5 through a first channel 2-7, and a claw body 2-2 is arranged in each cavity 2-6, and the claw body 2-2 is arranged along the radial direction of the second rotating body 2-3, the outer end of the claw body 2-2 is located in the cavity 2-6, and the inner end of the claw body 2-2 passes through the first channel 2-7; The height of the first channel 2-7 is greater than the height of the claw body 2-2, and the height difference between the first channel 2-7 and the claw body 2-2 is less than 3 mm;

[0061] The first piston 2-9, the second piston 2-10 and the third piston 2-11 are arranged at intervals and limited in the annular channel. The first piston 2-9 and the second piston 2-10 are respectively fixed to the claw body 2-2 located in the cavity 2-6. The first piston 2-9 is located above the claw body 2-2, and the second piston 2-10 is located below the claw body 2-2. The first piston 2-9, the second piston 2-10 and the third piston 2-11 divide the annular channel into a first space and a second space that are not connected to each other. The first space and the second space are respectively filled with a pressure transmission medium, which can be a gas or a liquid. Among them, the fixing member 2-8 is formed with an inclined surface on one side close to the second through hole 2-5, and the outer end surface of the claw body 2-2 is in contact with the inclined surface (the outer end surface of the claw body 2-2 is in contact with the inclined surface). The inclined surface is parallel to the inclined surface), the first piston 2-9 and the second piston 2-10 are in contact with the inclined surface on one side away from the second through hole 2-5, and the third piston 2-11 is fixed with a push rod 2-13. The push rod 2-13 drives the third piston 2-11 to move along the annular channel so as to transfer the first piston 2-9 and the second piston 2-10 along the annular channel through the pressure transmission medium, thereby driving the claw body 2-2 to slide along the inclined surface. When the claw body 2-2 slides on the inclined surface to the position closest to the second through hole 2-5, the inner end surface of the claw body 2-2 protrudes from the side wall of the second through hole 2-5, thereby clamping the rod 5; when the claw body 2-2 slides on the inclined surface to the position farthest from the second through hole 2-5, the inner end surface of the claw body 2-2 does not protrude from the side wall of the second through hole 2-5, thereby releasing the claw. Example 3

[0062] A continuous friction stir additive manufacturing device for alternately pushing rods, such as Figure 5As shown, on the basis of Example 2, the push rod 2-13 is vertically arranged, and the push rod 2-13 passes through the second rotating body 2-3 and the cavity 2-6 therein, and the upper end and the lower end of the push rod 2-13 respectively protrude from the second rotating body 2-3, and the lengths of the push rod 2-13 in the two cavities 2-6 in the same second rotating body 2-3 are the same, and the distance between the inclined surfaces of the fixing part 2-8 in the two cavities 2-6 in the same second rotating body 2-3 gradually decreases from bottom to top. When the clamping and feeding mechanism 2 moves upward or downward along the screw 3-1, when the push rod 2-13 touches the first rotating body 4-2 of the baffle 4, the first rotating body 4-2 of the baffle 4 causes the push rod 2-13 to move in the vertical direction in the cavity 2-6. Specifically, when the clamping and feeding mechanism 2 moves downward until the push rod 2-13 touches the first rotating body 4-2 of the baffle 4 below it, under the blocking action of the first rotating body 4-2, the push rod 2-13 moves upward in the cavity 2-6 and then drives the third piston 2-11 to move upward along the annular channel. Since the first space and the second space are respectively filled with pressure transmission medium, in order to ensure that the volumes in the first space and the second space remain unchanged, under the action of the pressure transmission medium, the first piston 2-9 and the second piston 2-10 drive the claw body 2-2 to move downward, and the claw body 2-2 slides along the inclined surface while moving downward, and the distance between the two claw bodies 2-2 of the same second rotating body 2-3 increases, thereby realizing the release of the claw;

[0063] When the clamping and feeding mechanism 2 moves upward until the push rod 2-13 touches the first rotating body 4-2 of the baffle 4 above it, under the blocking action of the first rotating body 4-2, the push rod 2-13 moves downward in the cavity 2-6 and drives the third piston 2-11 to move downward along the annular channel. Since the first space and the second space are respectively filled with pressure transmission medium, in order to ensure that the volumes in the first space and the second space remain unchanged, under the action of the pressure transmission medium, the first piston 2-9 and the second piston 2-10 drive the claw body 2-2 to move upward. The claw body 2-2 slides along the inclined surface while moving upward, and the distance between the two claw bodies 2-2 of the same second rotating body 2-3 is reduced, thereby achieving the clamping of the claw on the bar 5;

[0064] Four ball screws 3 are arranged along a matrix.

[0065] A groove 2-12 is formed on the inclined surface, and the outer end surface of the claw body 2-2 is in contact with the bottom of the groove 2-12 (the bottom of the groove is also an inclined surface). The groove 2-12 is used to limit the sliding range of the claw body 2-2 along the inclined surface.

[0066] The two ball screws 3 corresponding to the nuts 3-2 fixedly mounted on the first clamping and feeding mechanism are located on the diagonal line of the matrix. The two ball screws 3 corresponding to the nuts 3-2 fixedly mounted on the second clamping and feeding mechanism are located on the diagonal line of the matrix.

[0067] The first rotating body 4-2 is formed with a first through hole 4-4 for passing the bar 5, and the gap between the side wall of the first through hole 4-4 and the bar 5 is 0.2-0.5 mm. The gap between the side wall of the second through hole 2-5 and the bar 5 is 0.2-0.5 mm. The cross-sections of the first through hole 4-4 and the second through hole 2-5 match the cross-sections of the bar 5, respectively.

[0068] The clamping claw bodies 2-2 of the first clamping and feeding mechanism and the second clamping and feeding mechanism are arranged alternately. The angle between the straight line where the clamping claw bodies 2-2 of the first clamping and feeding mechanism are located and the straight line where the clamping claw bodies 2-2 of the second clamping and feeding mechanism are located is 90°.

[0069] The angle between the inclined surface and the axial direction of the second through hole 2-5 is 10-30 degrees. The screw 3-1 of each ball screw 3 is driven by a second motor 3-3, and the second motor 3-3 is fixed on the frame 1. The lower end of the screw 3-1 of each ball screw 3 is installed on the frame 1 and is rotatably connected to the frame 1.

[0070] In order to increase the stability of the continuous stir friction additive manufacturing device, the continuous stir friction additive manufacturing device also includes two second guide pillars, both of which are arranged in the vertical direction, the second guide pillars are optical axes, and the two second guide pillars pass through the first frame and the second frame to guide the sliding of the two clamping and feeding mechanisms along the screw.

[0071] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A continuous friction stir additive manufacturing device for alternately pushing rods, characterized in that: include: A frame (1), two clamping and feeding mechanisms (2), four vertically arranged ball screws (3), a tool head (6), a first motor and a plurality of first guide pillars, three baffles (4) are fixedly mounted on the frame (1), the baffles (4) are horizontally arranged, the three baffles (4) are parallel to each other and arranged in the vertical direction, and one of the clamping and feeding mechanisms (2) is arranged between every two adjacent baffles (4); each baffle (4) comprises: a first frame (4-1) and a first rotating body (4-2), the first frame (4-1) being used for being fixedly mounted on the frame (1), the first rotating body (4-2) being embedded in the first frame (4-1) and having a first bearing (4-3) installed between the first frame (4-1) and the first rotating body (4-2) so that the first rotating body (4-2) can rotate on the first frame (4-1); Each clamping and feeding mechanism (2) comprises: a second frame (2-1) and a second rotating body (2-3); the second rotating body (2-3) is embedded in the second frame (2-1) and a second bearing (2-4) is installed between the second frame (2-1) and the second rotating body (2-3) so that the second rotating body (2-3) can rotate on the second frame (2-1); the second rotating body (2-3) and the first rotating body (4-2) are arranged in parallel; The screw rods (3-1) of the four ball screws (3) are all arranged in the vertical direction and pass through the second frames (2-1) of the two clamping and feeding mechanisms (2) and the first frames (4-1) of the three baffles (4); the two clamping and feeding mechanisms (2) are, from top to bottom, a first clamping and feeding mechanism and a second clamping and feeding mechanism; the nuts (3-2) of the two ball screws (3) are fixedly mounted on the first clamping and feeding mechanism and are not connected to the second clamping and feeding mechanism; and the nuts (3-2) of the other two ball screws (3) are fixedly mounted on the second clamping and feeding mechanism and are not connected to the first clamping and feeding mechanism; The bar material (5) passes through the axis of the second rotating body (2-3) and the axis of the first rotating body (4-2) in the vertical direction; A clamping claw is installed on the second rotating body (2-3) for clamping the bar (5); The tool head (6) comprises: a spindle rotating body (6-1), a tool handle connecting structure (6-2), a spindle housing (6-3) and a shoulder tool (6-4); the tool handle connecting structure (6-2) is fixedly mounted in the spindle rotating body (6-1) and is coaxially arranged with the spindle rotating body (6-1); the spindle rotating body (6-1) is fixedly mounted with a first rotating body (4-2) located at the bottom of the baffle (4); the spindle housing (6-3) is fixedly mounted with the frame (1); the spindle housing (6-3) is sleeved outside the spindle rotating body (6-1) and a third bearing (6-5) is installed between the spindle housing (6-3) and the spindle rotating body (6-1); the shoulder tool (6-4) is fixedly mounted at the lower end of the tool handle connecting structure (6-2); and a bar material (5) passes through the tool handle connecting structure (6-2) and the shoulder tool (6-4) along the axis of the tool handle connecting structure (6-2) and the axis of the shoulder tool (6-4); Each first guide column is arranged along the vertical direction, and a plurality of first guide columns pass through the first rotating body (4-2) and the second rotating body (2-3); The first motor is used to drive the main shaft rotating body (6-1) to rotate, so that the main shaft rotating body (6-1), the first rotating body (4-2) and the second rotating body (2-3) rotate at the same speed; The clamping claw comprises: a clamping claw body (2-2); a second through hole (2-5) for passing the bar (5) is formed in the second rotating body (2-3); two cavities (2-6) are formed in the second rotating body (2-3); the two cavities (2-6) are symmetrically arranged with the second through hole (2-5) as the center line; each of the cavities (2-6) comprises: a fixing member (2-8), a first piston (2-9), a second piston (2-10) and a third piston (2-11); the fixing member (2-8) is fixed in the cavity (2-6) and forms an annular channel in the space inside the cavity (2-6); Each annular channel is connected to the second through hole (2-5) via a first channel (2-7); a claw body (2-2) is arranged in each cavity (2-6); the claw body (2-2) is arranged along the radial direction of the second rotating body (2-3); an outer end of the claw body (2-2) is located in the cavity (2-6); and an inner end of the claw body (2-2) passes through the first channel (2-7); a height of the first channel (2-7) is greater than a height of the claw body (2-2); The first piston (2-9), the second piston (2-10) and the third piston (2-11) are arranged at intervals and limited in the annular channel. The first piston (2-9) and the second piston (2-10) are respectively fixed to the claw body (2-2) located in the cavity (2-6). The first piston (2-9) is located above the claw body (2-2), and the second piston (2-10) is located below the claw body (2-2). The first piston (2-9), the second piston (2-10) and the third piston (2-11) divide the annular channel into a first space and a second space that are not connected to each other. The first space and the second space are respectively filled with a pressure transmission medium. The fixing member (2-8) has a slope formed on one side close to the second through hole (2-5). The outer end surface of the claw body (2-2) is in contact with the inclined surface, the third piston (2-11) is fixedly mounted with a push rod (2-13), and the push rod (2-13) drives the third piston (2-11) to move along the annular channel so that the first piston (2-9) and the second piston (2-10) move along the annular channel, and drives the claw body (2-2) to slide along the inclined surface. When the claw body (2-2) slides on the inclined surface to the position closest to the second through hole (2-5), the inner end surface of the claw body (2-2) protrudes from the side wall of the second through hole (2-5); when the claw body (2-2) slides on the inclined surface to the position farthest from the second through hole (2-5), the inner end surface of the claw body (2-2) does not protrude from the side wall of the second through hole (2-5); The push rod (2-13) is vertically arranged, and passes through the second rotating body (2-3) and the cavity (2-6) therein; the upper end and the lower end of the push rod (2-13) respectively protrude from the second rotating body (2-3); the lengths of the push rod (2-13) in the two cavities (2-6) in the same second rotating body (2-3) are the same; and the distance between the inclined surfaces of the fixing parts (2-8) in the two cavities (2-6) in the same second rotating body (2-3) gradually decreases from bottom to top.

2. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: A groove (2-12) is formed on the inclined surface, and the outer end surface of the clamping claw body (2-2) is in contact with the bottom of the groove (2-12). The groove (2-12) is used to limit the sliding range of the clamping claw body (2-2) along the inclined surface.

3. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: Four ball screws (3) are arranged along a matrix, and two ball screws (3) corresponding to nuts (3-2) fixedly mounted on the first clamping and feeding mechanism are located on a diagonal line of the matrix; and two ball screws (3) corresponding to nuts (3-2) fixedly mounted on the second clamping and feeding mechanism are located on a diagonal line of the matrix.

4. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: A first through hole (4-4) for passing the bar (5) is formed in the first rotating body (4-2), and a gap between a side wall of the first through hole (4-4) and the bar (5) is 0.2-0.5 mm; a gap between a side wall of the second through hole (2-5) and the bar (5) is 0.2-0.5 mm.

5. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: The clamping claw bodies (2-2) of the first clamping and feeding mechanism and the second clamping and feeding mechanism are arranged alternately; the angle between the straight line where the clamping claw bodies (2-2) of the first clamping and feeding mechanism are located and the straight line where the clamping claw bodies (2-2) of the second clamping and feeding mechanism are located is 90°.

6. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: The included angle between the inclined surface and the axial direction of the second through hole (2-5) is 10-30°.

7. The continuous friction stir additive manufacturing device according to claim 1, characterized in that: The lower end of the screw rod (3-1) of each ball screw (3) is mounted on the frame (1) and is rotationally connected to the frame (1).

8. The method for using the continuous friction stir additive manufacturing device according to claim 1, characterized in that: The following steps are involved: S1, loosening the clamping claw of the clamping feeding mechanism (2), allowing the bar material (5) to pass through the second rotating body (2-3), the first rotating body (4-2), the tool holder connecting structure (6-2) and the shoulder tool (6-4); adjusting the distance between the bottom surface of the shoulder tool (6-4) and the surface of the workpiece on which the deposition layer is to be deposited; S2, the claws of at least one clamping and feeding mechanism (2) are used to clamp the bar material (5), the first motor drives the main shaft rotating body (6-1) to rotate, so that the main shaft rotating body (6-1), the first rotating body (4-2), the second rotating body (2-3), the shoulder tool (6-4), the tool holder connecting structure (6-2) and the bar material (5) rotate at the same speed, and while the main shaft rotating body (6-1) rotates, the continuous stir friction additive manufacturing device performs feeding: the claws of at least one clamping and feeding mechanism (2) are used to clamp the bar material (5), and the ball screw (3) corresponding to the clamping and feeding mechanism (2) that clamps the bar material (5) is moved, so that the clamping and feeding mechanism (2) that clamps the bar material (5) drives the bar material (5) to move downward, and during the feeding process of the continuous stir friction additive manufacturing device, the two clamping and feeding mechanisms (2) are relayed to clamp the bar material (5) and drive the bar material (5) to move downward.

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