Friction stir additive device

Abstract

The present invention discloses a friction stir additive device, which belongs to the field of solid-phase additive manufacturing. The friction stir additive device includes: a first stationary shoulder, in which a cutting channel is formed; a second stationary shoulder, in which the first stationary shoulder and the second stationary shoulder are spaced apart in the axial direction; a main shaft, wherein the main shaft includes a cutting segment and a connecting segment connected in sequence, the cutting segment includes a cutting rib protruding radially from the main body of the main shaft, the connecting segment is connected to the end of the cutting segment, the cutting segment is accommodated in the cutting channel, and the connecting segment is connected to the second stationary shoulder. This structure can replace the substrate support of the deposited layer in the friction stir additive manufacturing process and is used for the manufacture of unsupported curved surfaces and suspended components.

Description

Technical Field

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

[0002] Friction stir additive manufacturing is a new solid-phase additive manufacturing technology. During the additive manufacturing process, the material does not need to be melted and then solidified. Friction stir additive manufacturing can be performed by cutting the silk material into particles.

[0003] In the related art, during the friction stir additive manufacturing process, the deposited layer requires substrate support, and it is impossible to achieve unsupported complex curved surfaces and suspended components. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a friction stir additive manufacturing device that solves the problem that the deposited layer requires a substrate to support the friction stir additive manufacturing process, making it impossible to produce unsupported complex curved surfaces and suspended components.

[0005] According to an embodiment of the present invention, the friction stir additive device includes: a first stationary shoulder, a cutting channel is formed in the first stationary shoulder; a second stationary shoulder, the first stationary shoulder and the second stationary shoulder are arranged axially spaced apart; a main shaft, the main shaft includes a cutting segment and a connecting segment connected in sequence, the cutting segment includes a cutting rib protruding radially from the main body of the main shaft, the connecting segment is connected to the end of the cutting segment, the cutting segment is accommodated in the cutting channel, and the connecting segment is connected to the second stationary shoulder.

[0006] According to an embodiment of the present invention, a friction stir additive device is provided, by setting a first stationary shoulder and a second stationary shoulder spaced apart and cooperating with a main shaft having a cutting section and a connecting section, so as to deposit in the gap between the upper and lower stationary shoulders, thereby realizing the manufacturing of an unsupported suspended structure.

[0007] According to one embodiment of the present invention, the first stationary shoulder is provided with a feed hole running through it, and the feed hole faces the cutting segment.

[0008] According to one embodiment of the present invention, the axis of the feed hole intersects with the axis of the main shaft, and the angle formed away from the second stationary shoulder is an acute angle.

[0009] According to one embodiment of the present invention, the end surface of the second stationary shoulder facing the first stationary shoulder is formed as a deposition platform, and the normal line of the extension plane of the deposition platform is parallel to or coincides with the axis of the main shaft.

[0010] According to one embodiment of the present invention, the deposition platform includes a deposition surface, a transition surface and a detachment surface in sequence extending radially outward, the distance from the deposition surface to the first stationary shoulder is smaller than the distance from the detachment surface to the first stationary shoulder, and the transition surface gradually extends inclined between the deposition surface and the detachment surface.

[0011] According to one embodiment of the present invention, the separation surface extends radially to the outside of the first stationary shoulder.

[0012] According to one embodiment of the present invention, the second stationary shoulder includes a rotating part and a fixed part, the rotating part is hollow and is sleeved outside the connecting section, the rotating part is fixedly connected to the connecting section, the fixed part is hollowly sleeved outside the rotating part, and the end face of the fixed part facing the first stationary shoulder is formed as a deposition platform.

[0013] According to one embodiment of the present invention, a bearing is installed between the fixed part and the rotating part.

[0014] According to one embodiment of the present invention, a top screw is provided on the wall surface of the rotating part and passes through it, and a positioning groove facing the top screw hole is provided on the connecting section, and the top screw passes through the top screw hole and penetrates into the positioning groove.

[0015] According to one embodiment of the present invention, the outer diameter of the connecting segment is smaller than the outer diameter of the cutting segment.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 Schematic diagram of a friction stir additive device provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a first stationary shoulder provided by an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of a second stationary shoulder provided by an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of a main shaft provided by an embodiment of the present invention;

[0022] Figure 5 It is a front view of the main shaft provided by an embodiment of the present invention.

[0023] Figure markings: first stationary shoulder 1, cutting channel 11, feed hole 12, spindle 2, cutting section 21, cutting rib 211, connecting section 22, second stationary shoulder 3, rotating part 311, fixed part 312, deposition platform 32, deposition surface 321, transition surface 322, disengagement surface 323, top screw hole 41, top screw 5, bearing 6, positioning groove 7. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] Reference below Figure 1-Figure 5 A friction stir additive manufacturing apparatus according to an embodiment of the present invention is described.

[0026] In some embodiments, the friction stir additive device includes: a first stationary shoulder 1 , a second stationary shoulder 3 and a main shaft 2 .

[0027] like Figure 1-5 As shown, a cutting channel 11 is formed in the first stationary shoulder 1, and the first stationary shoulder 1 and the second stationary shoulder 3 are arranged axially spaced apart. The main shaft 2 includes a cutting segment 21 and a connecting segment 22 connected in sequence. The cutting segment 21 includes a cutting rib 211 protruding radially from the main body of the main shaft 2. The connecting segment 22 is connected to the end of the cutting segment 21. The cutting segment 21 is accommodated in the cutting channel 11, and the connecting segment 22 is connected to the second stationary shoulder 3.

[0028] It can be understood that the present invention provides two stationary shoulders spaced apart in the upper and lower directions, the main shaft 2 rotates and cooperates in the first stationary shoulder 1 and the second stationary shoulder 3, and a cutting segment 21 is provided on the main shaft 2 to cooperate with the cutting channel 11 of the first stationary shoulder 1. The cutting segment 21 is formed as a cutting rib 211 radially protruding from the main shaft 2, which is used to shear the wire into particles. The particles fall under the action of extrusion, gravity, etc. A connecting section 22 is provided on the main shaft 2 to cooperate with the second stationary shoulder 3. The connecting section 22 is connected to the end of the cutting segment 21. The sheared particles are directly deposited in the gap between the first stationary shoulder 1 and the second stationary shoulder 3 under the dual action of friction and plastic deformation heat to perform additive manufacturing.

[0029] According to the friction stir additive device of an embodiment of the present invention, by setting a first stationary shoulder 1 and a second stationary shoulder 3 spaced apart in the upper and lower directions, the cutting section 21 and the connecting section 22 of the main shaft 2 respectively cooperate with the cutting channel 11 of the first stationary shoulder 1 and the second stationary shoulder 3, and additive manufacturing is performed directly in the gap between the first stationary shoulder 1 and the second stationary shoulder 3, without the need to clamp the substrate or process to remove the substrate, thereby realizing solid-phase additive manufacturing of curved surfaces or suspended structures under conditions without substrate support.

[0030] In one embodiment, the cutting segment 21 may be in the form of a screw.

[0031] In some embodiments, the friction stir additive manufacturing device includes: a first stationary shoulder 1 is provided with a feed hole 12 passing through the first stationary shoulder 1 , and the feed hole 12 faces the cutting segment 21 .

[0032] like Figure 2 As shown, a feed hole 12 is provided on the wall of the first stationary shoulder 1, through which the wire enters the first stationary shoulder 1. The feed hole 12 faces the cutting section 21, so that after the wire enters the first stationary shoulder 1, it is directly cut into particles by the cutting ribs 211 of the cutting section 21 and falls along the cutting channel 11.

[0033] According to the friction stir additive device of an embodiment of the present invention, a feed hole 12 facing the cutting section 21 is provided on the first stationary shoulder 1, so that the wire material can enter the cutting channel 11 in the first stationary shoulder 1 and be cut into particles.

[0034] In some embodiments, the friction stir additive device includes: the axis of the feed hole 12 intersects with the axis of the main shaft 2 and the angle formed away from the second stationary shoulder 3 is an acute angle.

[0035] like Figure 2 As shown, the axis of the feed hole 12 intersects with the axis of the main shaft 2 and the angle formed away from the second stationary shoulder 3 is an acute angle, that is, the feed hole 12 is inclined downward from the outside to the inside on the wall of the first stationary shoulder 1, and the wire can enter the cutting channel 11 along the inclined feed hole 12.

[0036] According to the friction stir additive device of an embodiment of the present invention, the axis of the feed hole 12 is set to intersect with the axis of the main shaft 2 and the angle formed away from the second stationary shoulder 3 is an acute angle, which facilitates the wire material to enter the cutting channel 11 along the feed hole 12 and be cut into particles, and fall along the cutting channel 11, thereby improving the feeding efficiency.

[0037] In some embodiments, the friction stir additive device includes: the end surface of the second stationary shoulder 3 facing the first stationary shoulder 1 is formed as a deposition platform 32 , and the normal line of the extension plane of the deposition platform 32 is parallel to or coincides with the axis of the main shaft 2 .

[0038] like Figure 1 and Figure 3 As shown, the end face of the second stationary shoulder 3 facing the first stationary shoulder 1 is formed as a deposition platform 32. The deposition platform 32 is formed as a circular ring in the radial direction of the main shaft 2. The normal of the extension plane of the deposition platform 32 coincides with the axis of the main shaft 2. The main shaft 2 is fitted in the deposition platform 32. During the additive process, the main shaft 2 squeezes the sheared particles out of the gap between the deposition platform 32 and the bottom end face of the first stationary shoulder 1 under the dual effects of friction and plastic deformation heat, and directly deposits them in the planar gap of the deposition platform 32 facing the first stationary shoulder 1 to perform additive manufacturing.

[0039] According to the friction stir additive device of an embodiment of the present invention, a deposition platform 32 is provided on the second stationary shoulder 3, so that the material extruded from the cutting segment 21 is deposited between the deposition platform 32 and the first stationary shoulder 1, and additive manufacturing is performed radially outward along the deposition platform 32. The deposition platform 32 provides support during the manufacturing process to improve the stability of additive manufacturing.

[0040] In some embodiments, in a friction stir additive device: the deposition platform 32 includes a deposition surface 321, a transition surface 322 and a detachment surface 323 radially outward in sequence, the distance from the deposition surface 321 to the first stationary shoulder 1 is smaller than the distance from the detachment surface 323 to the first stationary shoulder 1, and the transition surface 322 gradually extends at an angle between the deposition surface 321 and the detachment surface 323.

[0041] like Figure 1 and Figure 3 As shown, the deposition platform 32 includes a deposition surface 321, a transition surface 322, and a release surface 323, which extend radially outward. The deposition surface 321 and the release surface 323 are both annular in the radial direction of the main shaft 2. The transition surface 322 gradually extends at an angle between the deposition surface 321 and the release surface 323. The distance from the deposition surface 321 to the first stationary shoulder 1 is less than the distance from the release surface 323 to the first stationary shoulder 1, that is, the deposition platform 32 is formed as a boss. In addition, the cross section of the first stationary shoulder 1 facing the deposition platform 32 can also form a boss.

[0042] According to the friction stir additive device of an embodiment of the present invention, a deposition surface 321, a transition surface 322 and a disengagement surface 323 are sequentially arranged radially outward. During the additive process, the additive raw material sheared into granular form is extruded downward along the axial direction of the cutting section 21, and is plasticized under the dual effects of friction and plastic deformation heat and deposited in the planar gap of the deposition surface 321 toward the first stationary shoulder 1 to perform additive manufacturing. At the same time, since the deposition surface 321, the transition surface 322 and the disengagement surface 323 are formed as bosses, after the material is added to the deposition surface 321, the transition surface 322 and the disengagement surface 323 will not interfere with each other, thereby making the structural flexibility of additive manufacturing high without substrate support.

[0043] In some embodiments, the friction stir additive manufacturing device includes: a release surface 323 extending radially to the outside of the first stationary shoulder 1 .

[0044] like Figure 1 As shown, the detachment surface 323 extends radially to the outside of the first stationary shoulder 1 , that is, the outer diameter of the second stationary shoulder 3 is larger than the outer diameter of the first stationary shoulder 1 , so as to arrange the deposition surface 321 , the transition surface 322 and the detachment surface 323 .

[0045] According to the friction stir additive device of the embodiment of the present invention, the separation surface 323 extends radially to the outside of the first stationary shoulder 1 to facilitate the arrangement of the deposition surface 321, the transition surface 322 and the separation surface 323, thereby improving the additive stability.

[0046] In some embodiments, the second stationary shoulder 3 includes a rotating portion 311 and a fixed portion 312. The rotating portion 311 is hollow and is sleeved outside the connecting section 22. The rotating portion 311 is fixedly connected to the connecting section 22. The fixed portion 312 is hollow and sleeved outside the rotating portion 311. The end face of the fixed portion 312 facing the first stationary shoulder 1 is formed as a deposition platform 32.

[0047] like Figure 1 As shown, the second stationary shoulder 3 includes a rotating part 311 and a fixed part 312. The rotating part 311 is hollow and is sleeved outside the connecting section 22. The rotating part 311 is fixedly connected to the connecting section 22. The fixed part 312 is hollow and sleeved outside the rotating part 311 and remains stationary. The end face of the fixed part 312 facing the first stationary shoulder 1 is formed as a deposition platform 32 for material deposition.

[0048] According to the friction stir additive device of an embodiment of the present invention, a rotating part 311 and a fixed part 312 are provided. The rotating part 311 is hollow and is arranged outside the connecting section 22. The rotating part 311 is fixedly connected to the connecting section 22. The material is thermally plasticized and additively added due to the rotation of the main shaft 2, and the fixed part 312 is kept stationary for easy support. The deposition platform 32 facilitates material deposition.

[0049] In some embodiments, a bearing 6 is included and installed between the fixed portion 312 and the rotating portion 311 .

[0050] like Figure 1 As shown, the bearing 6 is installed between the fixed part 312 and the rotating part 311, and the side of the bearing 6 connected to the fixed part 312 remains stationary. Under the dual effects of friction and plastic deformation heat, the sheared particles are directly deposited in the gap between the first stationary shoulder 1 and the second stationary shoulder 3 to perform additive manufacturing.

[0051] According to the friction stir additive device of an embodiment of the present invention, the bearing 6 is provided to keep the fixed part 312 stationary, thereby stably supporting the additive deposition manufacturing, while reducing the friction between the rotating part 311 and the fixed part 312, avoiding wear and temperature rise caused by high-speed rotation, and improving the additive efficiency and quality.

[0052] In some embodiments, a top screw 5 is included, a top screw hole 41 is provided on the wall of the rotating part 311, and a positioning groove 7 facing the top screw hole 41 is provided on the connecting section 22. The top screw 5 passes through the top screw hole 41 and penetrates into the positioning groove 7.

[0053] like Figure 1 and Figure 4 As shown, one end of the top screw 5 cooperates with a top screw hole 41 provided on the wall of the rotating part 311 and passes through it, and the other end of the top screw 5 cooperates with a positioning groove 7 provided on the connecting section 22 and facing the top screw hole 41. The top screw 5 passes through the top screw hole 41 and penetrates into the positioning groove 7 to fix the connecting section 22 and the rotating part 311 together.

[0054] According to the friction stir additive device of an embodiment of the present invention, by providing a top screw 5 that cooperates with the top screw hole 41 provided on the rotating part 311 and the positioning groove 7 provided on the connecting section 22, the connecting section 22 and the rotating part 311 can rotate synchronously, thereby improving the rotation stability and additive quality.

[0055] In some embodiments, the outer diameter of the connecting segment 22 is smaller than the outer diameter of the cutting segment 21 .

[0056] like Figure 1 As shown, the outer diameter of the connecting segment 22 is smaller than that of the cutting segment 21 , so that the cutting segment 21 rotates to cut the wire into particles, and the granular material is thermally plasticized and deposited in the gap between the first stationary shoulder 1 and the second stationary shoulder 3 .

[0057] According to an embodiment of the present invention, the friction stir additive device includes: a first stationary shoulder 1, a second stationary shoulder 3 and a spindle 2, a cutting channel 11 is formed in the first stationary shoulder 1, the first stationary shoulder 1 and the second stationary shoulder 3 are spaced apart in the axial direction, the spindle 2 includes a cutting segment 21 and a connecting segment 22 connected in sequence, the cutting segment 21 includes a cutting rib 211 protruding radially from the main body of the spindle 2, the first stationary shoulder 1 is provided with a feed hole 12 passing through it, and the end of the second stationary shoulder 3 facing the first stationary shoulder 1 is provided with a feed hole 12 passing through the first stationary shoulder 1. The surface is formed as a deposition platform 32, and the deposition platform 32 includes a deposition surface 321, a transition surface 322 and a separation surface 323 in sequence radially outward. The second stationary shoulder 3 includes a rotating portion 311 and a fixed portion 312. The rotating portion 311 is hollow and is sleeved outside the connecting section 22. The rotating portion 311 is fixedly connected to the connecting section 22. A top screw hole 41 is provided on the wall of the rotating portion 311, and a positioning groove 7 is provided on the connecting section 22 facing the top screw hole 41. The top screw 5 passes through the top screw hole 41 and penetrates into the positioning groove 7. During the additive process of the friction stir additive device, the first stationary shoulder 1 and the second stationary shoulder 3 remain stationary, the wire enters the cutting channel 11 through the feed hole 12, and the rotation of the main shaft 2 drives the cutting section 21 to rotate, cutting the wire into granules for further friction additive. The cut granular material is thermally plasticized under the action of rotation, extrusion, and stirring friction, and is deposited on the deposition platform 32 to achieve substrate-free additive. The top wire 5 passes through the top wire hole 41 and penetrates into the positioning groove 7 to achieve synchronous rotation of the connecting section 22 and the rotating part 311 during the additive process.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0059] In the description of the present invention, "plurality" means two or more.

[0060] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A friction stir additive device, characterized in that: include: a first stationary shoulder, wherein a cutting channel is formed in the first stationary shoulder; a second stationary shoulder, wherein the first stationary shoulder and the second stationary shoulder are spaced apart from each other in the axial direction; The main shaft includes a cutting segment and a connecting segment connected in sequence, the cutting segment includes a cutting rib radially protruding from the main body of the main shaft, the connecting segment is connected to the end of the cutting segment, the cutting segment is accommodated in the cutting channel, and the connecting segment is connected to the second stationary shoulder.

2. The friction stir additive device according to claim 1, characterized in that: The first stationary shoulder is provided with a feed hole running through it, and the feed hole faces the cutting segment.

3. The friction stir additive device according to claim 2, characterized in that: The axis of the feed hole intersects with the axis of the main shaft, and the angle formed away from the second stationary shoulder is an acute angle.

4. The friction stir additive device according to claim 1, characterized in that: An end surface of the second stationary shoulder facing the first stationary shoulder is formed as a deposition platform, and a normal line of an extension plane of the deposition platform is parallel to or coincides with the axis of the main shaft.

5. The friction stir additive device according to claim 4, characterized in that: The deposition platform includes a deposition surface, a transition surface and a detachment surface in sequence extending radially outward. The distance from the deposition surface to the first stationary shaft shoulder is smaller than the distance from the detachment surface to the first stationary shaft shoulder. The transition surface gradually extends at an angle between the deposition surface and the detachment surface.

6. The friction stir additive device according to claim 5, characterized in that: The release surface extends radially to the outside of the first stationary shoulder.

7. The friction stir additive device according to claim 1, characterized in that: The second stationary shoulder includes a rotating part and a fixed part. The rotating part is hollow and is sleeved outside the connecting section. The rotating part is fixedly connected to the connecting section. The fixed part is hollow and sleeved outside the rotating part. The end face of the fixed part facing the first stationary shoulder is formed as a deposition platform.

8. The friction stir additive device according to claim 7, characterized in that: Also includes: A bearing is installed between the fixed part and the rotating part.

9. The friction stir additive device according to claim 8, characterized in that: Also includes: A top screw is provided on the wall surface of the rotating part and passes through the top screw hole, and a positioning groove facing the top screw hole is provided on the connecting section. The top screw passes through the top screw hole and penetrates into the positioning groove.

10. The friction stir additive device according to claim 1, characterized in that: The outer diameter of the connecting segment is smaller than the outer diameter of the cutting segment.

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