CN114905134B - Additive manufacturing device - Google Patents
Additive manufacturing device Download PDFInfo
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- CN114905134B CN114905134B CN202110184464.2A CN202110184464A CN114905134B CN 114905134 B CN114905134 B CN 114905134B CN 202110184464 A CN202110184464 A CN 202110184464A CN 114905134 B CN114905134 B CN 114905134B
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- additive manufacturing
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- 239000000654 additive Substances 0.000 title claims abstract description 113
- 230000000996 additive effect Effects 0.000 title claims abstract description 113
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 claims abstract description 51
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 230000001788 irregular Effects 0.000 claims abstract description 14
- 230000033001 locomotion Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000008713 feedback mechanism Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/1215—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention relates to the technical field of friction stir welding, in particular to an additive manufacturing device. According to the additive manufacturing device provided by the invention, the main shaft, the cutter handle and the stirring head are internally provided with the mutually communicated additive channels; the material adding channel comprises a first channel and a second channel which are coaxially arranged; the first channel is positioned in the main shaft and the cutter handle, at least one part of the first channel is an irregular channel, wherein the irregular channel is a channel formed by an outer contour of a regular polygon intersecting with a concentric circle of the regular polygon; the second channel is positioned in the stirring head, and at least the part of the second channel connected with the first channel is a regular polygon channel. The concentric circle where the circular outline is located is intersected with the regular polygon, so that the contact area of the pushing rod and the material adding material in the channel can be increased to the greatest extent, stable conveying of the material adding material can be realized on one hand, the pushing rod can be thickened as much as possible on the other hand, the strength of the pushing rod is improved, bending of the pushing rod in the pushing process is prevented, and the stability of the whole material adding manufacturing device is improved.
Description
Technical Field
The invention relates to the technical field of friction stir welding, in particular to an additive manufacturing device.
Background
The industrial development promotes the high-speed pushing of the machining industry, but the traditional turning, milling, planing and other technologies are insufficient to meet the industrial requirements, and an additive manufacturing mode is generated. The friction stir additive manufacturing is used as one of the solid phase additive technologies, and the additive materials can reach a plasticizing state by generating heat through friction of a stirring head, so that the manufacturing of complex parts can be rapidly realized, and the method has great engineering significance.
The bar is a conventional friction stir additive material in which the bar is placed in an additive channel and rotated with a stirring head for additive manufacturing. In order to continuously perform additive manufacturing, a conveying mechanism is required to continuously convey the bars, and related structures for conveying the bars in the friction stir additive process are not needed in the prior art, so that accurate and stable conveying of the bars is realized.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of stable bar conveying in the friction stir additive manufacturing process in the prior art, and further provides an additive manufacturing device.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides an additive manufacturing device which comprises a main shaft, a cutter handle and a stirring head, wherein the main shaft, the cutter handle and the stirring head are internally provided with additive channels which are mutually communicated;
The material adding channel comprises a first channel positioned in the main shaft and the cutter handle and a second channel positioned in the stirring head; the first channel and the second channel are coaxially arranged;
at least one part of the first channel is an irregular channel, wherein the irregular channel is a channel formed by an outer contour of a regular polygon intersecting with a concentric circle of the regular polygon; at least the part of the second channel connected with the first channel is a regular polygon channel.
In the additive manufacturing apparatus, all of the first channels are the irregular channels; the regular polygon of the first channel is identical to and aligned with the regular polygon of the second channel.
In the additive manufacturing apparatus, the regular polygon is square.
In the above-mentioned additive manufacturing device, still include additive push system, additive push system includes, push rod and first linear drive structure, the top of push rod with first linear drive structure is connected, the end of push rod is suitable for under first linear drive structure's drive, insert in the additive passageway in order to push the additive material.
In the additive manufacturing device, the push rod is a cylindrical push rod, and the section of the push rod is matched with the outer contour of the concentric circle.
The additive manufacturing device further comprises a push rod assisting structure which is movably sleeved on the push rod, wherein the push rod assisting structure is suitable for relative movement with the push rod in the axial direction of the push rod;
The push rod assisting structure comprises a push rod assisting structure,
The bearing is sleeved on the push rod;
And the bearing is fixed at the movable end of the second linear driving structure through a bearing seat.
In the additive manufacturing device, the first linear driving structure is an electric cylinder, and the starting end of the push rod is connected with the movable end of the electric cylinder; the second linear driving structure comprises a assisting motor, a screw rod and a sliding seat, wherein the screw rod is connected with the driving end of the assisting motor, and the sliding seat is in sliding fit with the screw rod.
In the above-mentioned additive manufacturing device, along with the propulsion of push rod, the bearing is located the middle part of the outside push rod of additive passageway all the time under the drive of second straight line drive structure.
In the additive manufacturing device, the movable end of the electric cylinder is sequentially provided with the pressure sensor, the end face bearing and the end cover bearing, the end face bearing is fixedly arranged at the bottom of the pressure sensor, and the end cover bearing is rotatably assembled at the bottom of the end face bearing; the end cover bearing is a bearing with a seat, and the starting end of the push rod is inserted into the shaft seat of the end cover bearing.
The additive manufacturing device further comprises a horizontal moving base and a frame, wherein the horizontal moving base is connected to the frame in a sliding manner through a guide rail; driven by a horizontal motor on the frame, the horizontal moving base drives the push rod and the first linear driving structure to horizontally move.
The technical scheme of the invention has the following advantages:
1. According to the additive manufacturing device provided by the invention, the main shaft, the cutter handle and the stirring head are internally provided with the mutually communicated additive channels; the material adding channel comprises a first channel and a second channel which are coaxially arranged; the first channel is positioned in the main shaft and the cutter handle, at least one part of the first channel is an irregular channel, wherein the irregular channel is a channel formed by an outer contour of a regular polygon intersecting with a concentric circle of the regular polygon; the second channel is positioned in the stirring head and is a regular polygon channel. A part of regular polygon outline is arranged in the first channel, all regular polygon channels are arranged in the second channel, regular polygons can be used for inserting and positioning regular prism-shaped additive materials to realize stable conveying, and a part of circular outline is also arranged in the first channel at the upper end, and can be used for inserting a cylindrical push rod to push the additive materials to move downwards to realize conveying of the additive materials; the concentric circle where the circular outline is located is intersected with the regular polygon, so that the contact area of the pushing rod and the material adding material in the channel can be increased to the greatest extent, stable conveying of the material adding material can be realized on one hand, the pushing rod can be thickened as much as possible on the other hand, the strength of the pushing rod is improved, bending of the pushing rod in the pushing process is prevented, and the stability of the whole material adding manufacturing device is further improved.
2. The additive manufacturing device comprises an additive pushing system, wherein the additive pushing system comprises a push rod and a first linear driving structure, the initial end of the push rod is connected with the first linear driving structure, and the tail end of the push rod is suitable for being inserted into an additive channel of a friction stir welding tool under the drive of the first linear driving structure to push additive materials, so that the conveying of the additive is realized; the device is characterized by further comprising a push rod assisting structure movably sleeved on the push rod, wherein the push rod assisting structure is suitable for relative movement between the axial direction of the push rod and the push rod so as to avoid shaking and bending of the push rod in the process of pushing the additive and prevent the push rod from being broken, so that accurate and stable conveying of the bar is ensured.
3. In the additive manufacturing device provided by the invention, along with the pushing of the push rod, the bearing is always positioned in the middle of the push rod at the outer side of the additive channel under the driving of the second linear driving structure, so that the bending of the push rod is further avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an additive manufacturing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an additive pushing system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a horizontal movement system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pressure sensor system according to an embodiment of the present invention;
FIG. 5 is a schematic view of a supporting structure according to an embodiment of the present invention;
FIG. 6 is a second schematic view of a supporting structure according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a spindle system according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a first channel provided by an embodiment of the present invention;
FIG. 9 is a schematic view of a portion of a tool shank according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a stirring head according to an embodiment of the present invention.
Reference numerals:
10-an additive pushing system; 11-a servo motor; 12-an electric cylinder rod; a 20-pressure sensor system; 21-a pressure sensor; 22-end face bearings; 23-end cap bearings; 30-assisting the structure; 31-assisting the motor; 32-bearing seats; 33-bearings; 34-vertical plates; 40-spindle system; 41-an additive channel inlet; 410-a first channel; 42-a main shaft; 43-knife handle; 44-a belt; 45-driving shaft; 50-stirring head; 51-mounting a flange; 510-a second channel; 511-bolt mounting holes; 512-positioning holes; 60-working table; 70-horizontally moving the base; 71-a frame; 72-a horizontal motor; 80-push rod; 90-a numerical control system; 100-air conditioning system.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
As shown in fig. 1-10, the present embodiment provides an additive manufacturing apparatus, which includes a spindle system 40, a stirring head 50 and a workbench 60, and in operation, the spindle system 40 drives the stirring head 50 to rotate, so as to implement additive manufacturing on the workbench 60; as shown in fig. 7, the spindle system 40 includes a spindle 42 which is driven to rotate by a drive shaft 45 of a spindle motor (not shown) through a belt 44 or a gear, and a tool shank 43 mounted on the spindle; a stirring head 50 is installed at the working end of the tool shank 43, wherein the main shaft 42, the tool shank 43 and the stirring head 50 can be installed in a known manner, and the main shaft 42, the tool shank 43 and the stirring head 50 are provided with mutually communicated additive channels, and the additive channels are provided with additive channel inlets 41.
According to the additive manufacturing device provided by the embodiment, when additive manufacturing is required, the bar to be added, such as an aluminum bar, is inserted into the additive channel from the additive channel inlet 41, and is pushed downwards under the action of the additive pushing system described below to perform additive manufacturing, and the additive pushing system can be prevented from rotating along with the bar.
In the additive manufacturing device provided by the embodiment, the spindle system is of a belt or gear transmission structure, the spindle is driven to rotate by the motor, and in order to avoid ablation of structures such as a spindle bearing and the like under the action of high-speed rotation and high temperature below, the spindle is required to be provided with a cooling system, and the cooling system can be of a water cooling structure and cools the spindle through cooling liquid of a water cooling machine. The main shaft can be cooled by replacing the water cooling machine with a hydraulic system. In addition, the additive manufacturing apparatus provided in the present embodiment may further include a numerical control system 90 and an air conditioning system 100.
In the additive manufacturing apparatus provided in this embodiment, the spindle 42, the shank 43, and the stirring head 50 have additive channels that are mutually communicated, and the additive channels have an inlet 41 of the additive channel. Wherein, as a preferred embodiment, the additive channel comprises a first channel 410 positioned in the main shaft and the cutter handle, and a second channel 510 positioned in the stirring head; the first channel 410 and the second channel 510 are coaxially arranged; at least a portion of the first channel 410 is an irregular channel, wherein the irregular channel is a channel formed by an outer contour of a regular polygon intersecting with a concentric circle thereof; the second channel is a regular polygon channel. However, not limiting to the embodiments of the present invention, as shown in fig. 8-10, the regular polygon is a regular quadrilateral. As shown in fig. 8, the channel formed by the outer contour of the regular polygon intersecting with the concentric circle thereof means that the cross section of the channel is the outer contour of the regular polygon intersecting with the concentric circle thereof, that is, the angles of each regular polygon are uniformly distributed on the circumference of the concentric circle thereof.
The additive manufacturing device provided by the embodiment comprises a first channel and a second channel which are coaxially arranged; the first channel is positioned in the main shaft and the cutter handle, at least one part of the first channel is an irregular channel, wherein the irregular channel is a channel formed by an outer contour of a regular polygon intersecting with a concentric circle of the regular polygon; the second channel is positioned in the stirring head and is a regular polygon channel. A part of regular polygon outline is arranged in the first channel, all regular polygon channels are arranged in the second channel, regular polygons can be used for inserting and positioning regular prism-shaped additive materials to realize stable conveying, and a part of circular outline is also arranged in the first channel at the upper end, and can be used for inserting a cylindrical push rod to push the additive materials to move downwards to realize conveying of the additive materials; the concentric circle where the circular outline is located is intersected with the regular polygon, so that the contact area of the pushing rod and the material adding material in the channel can be increased to the greatest extent, stable conveying of the material adding material can be realized on one hand, the pushing rod can be thickened as much as possible on the other hand, the strength of the pushing rod is improved, bending of the pushing rod in the pushing process is prevented, and the stability of the whole material adding manufacturing device is further improved.
Additionally, as an alternative embodiment, the second channel 510 in the stirring head may be a regular polygonal channel, which is a portion connected to the first channel 410, that is, an upper section of the second channel 510 is a regular polygonal channel; wherein the lower section of the second channel may be provided as a tapered channel with a flaring.
Preferably, in the additive manufacturing apparatus described above, all of the first channels 410 are the irregular channels; the regular polygon of the first channel 410 is identical to and aligned with the regular polygon of the second channel 510.
As shown in fig. 2-6, the additive manufacturing apparatus provided in this embodiment further includes an additive propulsion system 10, where the additive propulsion system 10 further includes a push rod 80 and a first linear driving structure, a start end of the push rod 80 is connected to the first linear driving structure, and a tail end of the push rod 80 is adapted to be driven by the first linear driving structure to be inserted into an additive channel of a friction stir welding tool to push an additive material; wherein, the start end of the push rod is the top end of the push rod 80 shown in fig. 5, and the end of the push rod is the bottom end of the push rod 80 shown in fig. 5. Specifically, the first linear driving structure may be provided as an electric cylinder including a servo motor 11 and an electric cylinder rod 12, as shown in fig. 2, the electric cylinder rod 12 being connected as a movable end of the electric cylinder with a start end of the push rod 80.
The push rod 80 is preferably a cylindrical push rod, and is made of a thimble material, because the push rod 80 rotates along with the rotation of the spindle in the material adding channel, the cylindrical push rod can avoid the centrifugal force generated by the push rod in the rotation process to a certain extent, but the cylindrical material used in industry has a certain error, so that the shaking phenomenon can inevitably occur in the rotation process, the push rod needs to bear larger pressure for pushing, and the push rod can be bent or broken when pressurized during shaking. As shown in fig. 5 and 6, the additive manufacturing apparatus provided in this embodiment further includes a push rod assisting structure 30 movably sleeved on the push rod 80, where the push rod assisting structure 30 is adapted to move relatively to the push rod in the axial direction of the push rod, so as to avoid shake and bending of the push rod during the process of pushing the additive, and prevent the push rod from breaking, so as to ensure accurate and stable conveying of the rod.
In addition, in the additive manufacturing apparatus, the section of the push rod is adapted to the outer contour of the concentric circle, so as to be capable of being inserted into the first channel in close contact with the wall of the additive channel.
As shown in fig. 5 and 6, in the additive manufacturing apparatus, the push rod assisting structure 30 includes a bearing 33 and a second linear driving structure, the bearing 33 is sleeved on the push rod 80, and the bearing 33 is fixed at a movable end of the second linear driving structure through a bearing seat 32. Specifically, the second linear driving structure comprises a assisting motor 31, a screw rod and a sliding seat, wherein the screw rod is connected with the driving end of the assisting motor 31, and the sliding seat is in sliding fit with the screw rod; wherein the bearing housing 32 is connected to the screw by a slide. The pushing system is responsible for pushing the raw material bar into the spindle while avoiding the system rotating with the bar. The part consists of a servo motor and an electric cylinder rod, wherein the servo motor rotates, and the rotating force is converted into the pushing force of the downward movement of the electric cylinder rod through a screw mechanism.
Because the first linear driving structure provides a greater downward pressure to the push rod 80, the push rod inevitably bends, and because the start end of the push rod 80 is fixedly connected with the first linear driving structure, the tail end of the push rod 80 is inserted into the material adding channel, so that the tail end of the push rod is axially fixed, and the two ends of the push rod are fixed, the position where the push rod is stressed to bend is generally generated at the middle position of a distance from the outer side of the material adding channel to the start end of the push rod. Therefore, preferably, in the above additive pushing system, as the pushing rod 80 is pushed, the bearing 33 is always located in the middle of the pushing rod outside the additive channel under the driving of the second linear driving structure, so as to further avoid bending of the pushing rod. In order to meet the requirement that the bearing 33 may always be in the middle of the outside of the additive channel during additive manufacturing, the speed of the downward movement of the bearing may be chosen to be half the push rod advancing speed. In addition, as an alternative embodiment, the helper motor 31 powering the bearing may be in communication with the servo motor 11 powering the pushrod; according to the signal of the servo motor 11, the assisting motor 31 can adjust the rotating speed in real time, so that the downward moving speed of the bearing is always half of the pushing speed of the push rod, and the bearing is always in the middle of the push rod outside the material adding channel.
Optionally, the additive manufacturing apparatus further includes a vertical plate 34, and the first linear driving structure and the second linear driving structure are both fixed on the vertical plate 34.
Optionally, in the additive manufacturing apparatus described above, the movable end of the electric cylinder is provided with a pressure sensor system 20, the pressure sensor system 20 includes a pressure sensor 21, an end face bearing 22, and an end cover bearing 23 that are sequentially disposed, the end face bearing 22 is fixedly disposed at the bottom of the pressure sensor 21, and the end cover bearing 23 is rotatably assembled at the bottom of the end face bearing 22; the end cover bearing 23 is a end cover bearing with a seat, the initial end of the push rod 80 is inserted into the shaft seat of the end cover bearing, and the end cover bearing plays a role in assembling and supporting the end cover bearing so as to ensure that the push rod has enough thrust and prevent the movable end of the electric cylinder from rotating along with the push rod, thereby ensuring the stability of the electric cylinder. The pressure sensor senses the pressure applied by the push rod to the raw material, and the closed-loop control of the pressure is realized through PID regulation of the PLC. The pressure system increases a feedback mechanism through a pressure sensor, ensures the additive pressure through a servo motor torque judgment and pressure sensor double feedback mechanism, and ensures the accuracy of the pressure by adopting the pressure sensor to establish the pressure feedback mechanism.
As shown in fig. 3, the additive manufacturing apparatus further includes a horizontal moving base 70 and a frame 71, wherein the horizontal moving base 70 is slidably connected to the frame 71 through a guide rail; the additive propulsion system 10 is fixed on the horizontal moving base 70, and is driven by a horizontal motor 72 on the frame 71, and the horizontal moving base 70 drives the push rod 80 and the first linear driving structure to horizontally move. The horizontal movement base drives the push rod and the first linear driving structure to horizontally move, so that the push rod can avoid the inlet of the material adding channel when the material adding material is assembled in the material adding channel, and the push rod is driven to reset to the inlet of the material adding channel after the material adding material is assembled, so that the smooth operation of the whole material adding material assembling procedure is facilitated.
Alternatively, as shown in fig. 10, the structure of the stirring head 50 of the additive manufacturing apparatus provided in this embodiment may include a body of the stirring head and a mounting flange 51, where a plurality of bolt mounting holes 511 may be provided on the mounting flange 51, and the axes of the bolt mounting holes 511 are parallel to the axis of the additive channel, that is, when the structure of the stirring head is mounted, the bolt mounting holes 511 are opposite to the mounting end surface of the tool shank; further, the bolt mounting hole is a T-shaped hole, and one end with a large diameter of the T-shaped hole is arranged towards the working end so as to facilitate screwing in of the bolt. Optionally, the mounting flange of the stirring head further has a plurality of positioning holes 512, and the positioning holes 512 are suitable for mounting positioning pins. The locating hole 512 may be inserted with a locating pin to achieve positioning during installation of the stirring head structure to ensure consistent docking of the cross sections of the additive channels in the stirring head structure and the handle structure. When the stirring head structure is used, at least two positioning pins can be inserted into the positioning holes, and then the protruding ends of the positioning pins are inserted into the positioning holes corresponding to the mounting ends of the cutter handles so as to realize circumferential positioning; simultaneously, the insertion end is inserted into the mounting hole of the cutter handle, and positioning in the mounting hole is realized through the positioning ring of the insertion end; the stirring head structure is then fixed by bolts.
When the additive manufacturing device provided by the embodiment is used, additive raw materials are put into an inlet of an additive channel below a push rod, a main shaft rotates and moves along the Z-axis direction, and the movement of the main shaft is stopped at a position, which is 0.1-5mm away from a base plate, of a stirring head; in particular, the position may be reached first and then rotated.
The push rod pushes the material downwards and applies pressure, and the main shaft moves according to the original path, so that the material is deposited on the substrate. Along with the certain of main shaft, raw materials consumption constantly shortens, and the push rod also moves down constantly, and the mechanism of helping also moves along with the push rod down motion this moment, lets the mechanism of helping be in push rod central point all the time. In particular, the device may not use a pressure sensor, but instead displacement control, i.e. 0.1-100mm of downward movement of the push rod per minute.
According to the additive manufacturing device provided by the embodiment, the tail end of the push rod of the additive pushing system is suitable for being driven by the first linear driving structure to be inserted into the additive channel of the friction stir welding tool to push the additive.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. An additive manufacturing apparatus, comprising,
The main shaft, the knife handle and the stirring head are internally provided with mutually communicated material adding channels;
the material adding channel comprises a first channel positioned in the main shaft and the cutter handle and a second channel positioned in the stirring head;
The first channel and the second channel are coaxially arranged;
At least one part of the first channel is an irregular channel, and a part of circular outline and a part of regular polygon outline are also arranged in the first channel, wherein the irregular channel is a channel formed by the outer outline of the regular polygon intersecting with the concentric circle of the regular polygon; at least the part of the second channel connected with the first channel is a regular polygon channel; the regular polygon of the first channel is identical to and aligned with the regular polygon of the second channel;
the material adding pushing system comprises a push rod and a first linear driving structure, and the starting end of the push rod is connected with the first linear driving structure;
The push rod assisting structure is movably sleeved on the push rod and is suitable for relative movement with the push rod in the axial direction of the push rod;
The push rod assisting structure comprises a bearing and a second linear driving structure, the bearing is sleeved on the push rod, and the bearing is fixed at the movable end of the second linear driving structure through a bearing seat;
The assisting motor for providing power for the bearing is in communication connection with the servo motor for providing power for the push rod; along with the pushing of the push rod, the bearing is always positioned in the middle of the push rod outside the material adding channel under the drive of the second linear driving structure.
2. An additive manufacturing apparatus according to claim 1, wherein the regular polygon is square.
3. An additive manufacturing apparatus according to any one of claims 1-2, wherein the end of the push rod is adapted to be inserted into the additive channel under the drive of the first linear drive structure to push additive material.
4. An additive manufacturing apparatus according to claim 3, wherein the push rod is a cylindrical push rod, the cross section of which is adapted to the outer contour of the concentric circles.
5. An additive manufacturing apparatus according to claim 1, wherein,
The first linear driving structure is an electric cylinder, and the starting end of the push rod is connected with the movable end of the electric cylinder;
the second linear driving structure comprises a assisting motor, a screw rod and a sliding seat, wherein the screw rod is connected with the driving end of the assisting motor, and the sliding seat is in sliding fit with the screw rod.
6. The additive manufacturing device according to claim 5, wherein the movable end of the electric cylinder is sequentially provided with a pressure sensor, an end face bearing and an end cover bearing, the end face bearing is fixedly arranged at the bottom of the pressure sensor, and the end cover bearing is rotatably assembled at the bottom of the end face bearing; the end cover bearing is a bearing with a seat, and the starting end of the push rod is inserted into the shaft seat of the end cover bearing.
7. The additive manufacturing apparatus of claim 6, further comprising a horizontally movable base and a frame, the horizontally movable base being slidably coupled to the frame by a guide rail; driven by a horizontal motor on the frame, the horizontal moving base drives the push rod and the first linear driving structure to horizontally move.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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