CN111438436A - Special floating stirring tool for friction stir welding - Google Patents
Special floating stirring tool for friction stir welding Download PDFInfo
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- CN111438436A CN111438436A CN202010461476.0A CN202010461476A CN111438436A CN 111438436 A CN111438436 A CN 111438436A CN 202010461476 A CN202010461476 A CN 202010461476A CN 111438436 A CN111438436 A CN 111438436A
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- stirring
- tool
- friction stir
- stir welding
- handle
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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
- B23K20/122—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 using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—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 using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/1255—Tools therefor, e.g. characterised by the shape of the probe
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a special floating stirring tool for friction stir welding, which comprises a tool handle and a stirring needle which are coaxially assembled, wherein the bottom end of the tool handle is provided with an inwards-recessed coaxial hole, the tail end of the stirring needle is connected in the coaxial hole in a sliding manner, the special floating stirring tool also comprises a coaxially-arranged outer sleeve, the outer sleeve is connected to the outer side of the bottom end of the tool handle, the outer sleeve is connected with the tool handle through threads, the outer sleeve is screwed to realize the pretightening force between the stirring needle and the tool handle, a first disc spring is arranged between the tool handle and the stirring needle, and a second disc spring is arranged between the outer sleeve and. Firstly, the invention has simple structure and lower cost; the pressure control mode of the pure mechanical mechanism has higher operation stability and better response real-time property.
Description
Technical Field
The invention discloses a floating stirring tool special for friction stir welding, and relates to the technical field of special friction welding.
Background
At present, more and more friction stir welding equipment is involved in the production field of rail traffic such as aerospace, aviation, high-speed rail and the like, and the friction stir welding technology belongs to a solid phase connection technology and is suitable for welding nonferrous metals such as aluminum alloy and the like. The stable control of welding pressure is the key of friction stir welding process technology, and sensor feedback control and hydraulic servo control mode are mostly adopted to realize at present, but the sensor feedback control mode response real-time is relatively poor, and hydraulic servo control mode structure is complicated, and the pneumatic cylinder is heavier, can not adapt to robot friction stir welding and use, and the cost of these two kinds of modes is higher, stability is not very easy to guarantee. The floating tool shank is reported more in the field of machining, but is rarely reported in the application field of special welding of friction stir welding; a special pure mechanical structure stirring tool suitable for self-adaptive regulation of welding pressure of friction stir welding is lacked in the prior art.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides the floating stirring tool special for friction stir welding, which has a simple structure and good stability.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a special floating stirring tool of friction stir welding, includes the handle of a knife and the stirring needle of coaxial assembly, the bottom of handle of a knife is equipped with inside sunken coaxial hole, the terminal sliding connection of stirring needle still includes the overcoat of coaxial setting in coaxial hole, the overcoat is connected in the bottom outside of handle of a knife, through threaded connection between overcoat and the handle of a knife, and the pretightning force between stirring needle and the handle of a knife can be realized to the overcoat tightening, set up first dish spring between handle of a knife and the stirring needle, set up the second dish spring between overcoat and the stirring needle.
Furthermore, a sliding groove is formed in the inner wall of the coaxial hole of the tool handle, the tail end of the stirring pin is fixedly connected with a guide key, and the guide key slides up and down along the sliding groove.
Furthermore, the middle part of the guide key is fixed on the stirring pin through a set screw.
Furthermore, a plurality of transverse through holes are sequentially formed in the guide key from top to bottom, and a first polytetrafluoroethylene block is embedded in each through hole.
Further, a plurality of vertical bar grooves are uniformly formed in the inner wall of the coaxial hole of the tool holder, second polytetrafluoroethylene blocks are embedded in the bar grooves, polytetrafluoroethylene has the characteristic of low friction coefficient, the smoothness of axial movement of the stirring needle can be ensured, and the floating response sensitivity is improved.
Further, the stirring pin front end sets up annular boss, first dish spring, second dish spring all cup joint in the both sides of stirring pin annular boss, first dish spring one end is connected in the bottom of handle of a knife, and the other end is connected in the up end of annular boss, second dish spring one end is connected in the inboard diapire of overcoat, and the other end is connected in the lower terminal surface of annular boss
Furthermore, a pointer is arranged on the annular boss, pretightening force scales matched with the pointer are arranged on the outer wall of the outer sleeve, and a pretightening force value, namely the current actual welding pressure value, can be displayed through the pointer.
The working principle is as follows: the guide key is fixed on the stirring pin through a set screw, the guide key limits the rotation between the stirring pin and the cutter handle, the axial movement of the stirring pin and the cutter handle is realized, and the floatability of the stirring pin is ensured; the first polytetrafluoroethylene block is embedded on the guide key, and the second polytetrafluoroethylene block is embedded at the circumferential contact part of the stirring pin and the tool shank; the first disc spring and the second disc spring are arranged on the upper side and the lower side of the annular boss of the stirring pin, and the pointer is arranged on the annular boss of the stirring pin and floats along with the stirring pin; in the actual welding process, the stirring pin can float in a self-adaptive mode along with the change of pressure caused by the unevenness, welding deformation and the like of a welding workpiece, and the stability of the welding pressure value in a reasonable process range can be ensured through the reasonable design of the first disc spring and the second disc spring.
Has the advantages that: firstly, the invention has simple structure and lower cost;
secondly, the pressure control mode of the pure mechanical mechanism has higher operation stability and better response real-time property;
thirdly, compared with a hydraulic servo control mode, the hydraulic control system has the advantages that a hydraulic cylinder with a complex structure and large weight is eliminated, and the hydraulic control system is more suitable for the application of robot friction stir welding.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is a schematic view of the external structure of the present invention;
FIG. 3 is a schematic view of an alternative internal structure of the present invention;
FIG. 4 is a schematic view of the installation of a second PTFE block of the present invention.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
According to an embodiment shown in fig. 1-4, the floating stirring tool special for friction stir welding comprises a handle 1 and a stirring needle 5 which are coaxially assembled, wherein the bottom end of the handle 1 is provided with an inward sunken coaxial hole, the tail end of the stirring needle 5 is connected in the coaxial hole in a sliding manner, the floating stirring tool further comprises an outer sleeve 8 which is coaxially arranged, the outer sleeve 8 is connected to the outer side of the bottom end of the handle 1, the outer sleeve is connected with the handle through threads, the outer sleeve is screwed tightly to realize pre-tightening force between the stirring needle and the handle, a first disc spring 6 is arranged between the handle 1 and the stirring needle 5, and a second disc spring 7 is arranged between the outer sleeve 8 and the stirring needle 5.
The inner wall of the coaxial hole of the tool handle 1 is provided with a sliding groove, the tail end of the stirring pin 5 is fixedly connected with a guide key 2, and the guide key 2 slides up and down along the sliding groove.
The middle part of the guide key 2 fixes the guide key 2 on the stirring pin 5 through a set screw 3.
The guide key 2 is sequentially provided with a plurality of transverse through holes from top to bottom, and a first polytetrafluoroethylene block 4 is embedded in each through hole.
A plurality of vertical bar grooves are uniformly formed in the inner wall of the coaxial hole of the tool handle 1, second polytetrafluoroethylene blocks 9 are embedded in the bar grooves, polytetrafluoroethylene has the characteristic of low friction coefficient, the smoothness of axial movement of a stirring needle can be ensured, and the floating response sensitivity is improved.
5 front ends of stirring pins set up annular boss 10, first dish spring 6, second dish spring 7 all cup joint in the both sides of stirring pin annular boss 10, first dish spring 6 one end is connected in the bottom of handle of a knife 1, and the other end is connected in the up end of annular boss 10, second dish spring 7 one end is connected in the inboard diapire of overcoat 8, and the other end is connected in the lower terminal surface of annular boss 10
The annular boss 10 is provided with a pointer, the outer wall of the outer sleeve 8 is provided with a pretightening force scale matched with the pointer, and the pretightening force value can be displayed through the pointer, namely the current actual welding pressure value.
The guide key is fixed on the stirring pin through the set screw, the guide key limits the rotation between the stirring pin and the cutter handle, the axial movement of the stirring pin and the cutter handle is realized, and the floatability of the stirring pin is ensured; the first polytetrafluoroethylene block is embedded on the guide key, and the second polytetrafluoroethylene block is embedded at the circumferential contact part of the stirring pin and the tool shank; the first disc spring and the second disc spring are arranged on the upper side and the lower side of the annular boss of the stirring pin, and the pointer is arranged on the annular boss of the stirring pin and floats along with the stirring pin; in the actual welding process, the stirring pin can float in a self-adaptive mode along with the change of pressure caused by the unevenness, welding deformation and the like of a welding workpiece, and the stability of the welding pressure value in a reasonable process range can be ensured through the reasonable design of the first disc spring and the second disc spring.
The invention has simple structure and lower cost; the pressure control mode of the pure mechanical mechanism has higher operation stability and better response real-time property; compared with a hydraulic servo control mode, the hydraulic cylinder with a complex structure and large weight is removed, and the method is more suitable for the application of robot friction stir welding.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a special stirring instrument that floats of friction stir welding, its characterized in that, handle of a knife (1) and stirring needle (5) including coaxial assembly, the bottom of handle of a knife (1) is equipped with the coaxial hole of inside sunken, the terminal sliding connection of stirring needle (5) is in coaxial hole, still includes overcoat (8) of coaxial setting, overcoat (8) are connected in the bottom outside of handle of a knife (1), set up first dish spring (6) between handle of a knife (1) and stirring needle (5), set up second dish spring (7) between overcoat (8) and stirring needle (5).
2. The special floating stirring tool for friction stir welding according to claim 1, wherein a sliding groove is formed in the inner wall of the coaxial hole of the tool shank (1), the tail end of the stirring pin (5) is fixedly connected with a guide key (2), and the guide key (2) slides up and down along the sliding groove.
3. The special floating stirring tool for friction stir welding according to claim 2, characterized in that the middle part of the guide key (2) fixes the guide key (2) on the stirring pin (5) through the set screw (3).
4. The special floating stirring tool for friction stir welding according to claim 2, wherein the guide key (2) is provided with a plurality of transverse through holes in sequence from top to bottom, and the first polytetrafluoroethylene block (4) is embedded in the through holes.
5. The special floating stirring tool for friction stir welding according to claim 1, wherein a plurality of vertical strip-shaped grooves are uniformly formed in the inner wall of the coaxial hole of the tool shank (1), and the second polytetrafluoroethylene block (9) is embedded in the strip-shaped grooves.
6. The special floating stirring tool for friction stir welding according to claim 1, wherein an annular boss (10) is arranged at the front end of the stirring pin (5), one end of the first disc spring (6) is connected to the bottom end of the tool holder (1), the other end of the first disc spring is connected to the upper end face of the annular boss (10), one end of the second disc spring (7) is connected to the inner bottom wall of the outer sleeve (8), and the other end of the second disc spring is connected to the lower end face of the annular boss.
7. The special floating stirring tool for friction stir welding according to claim 6, wherein the annular boss is provided with a pointer, and the outer wall of the outer sleeve (8) is provided with a pre-tightening force scale matched with the pointer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010461476.0A CN111438436A (en) | 2020-05-27 | 2020-05-27 | Special floating stirring tool for friction stir welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010461476.0A CN111438436A (en) | 2020-05-27 | 2020-05-27 | Special floating stirring tool for friction stir welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111438436A true CN111438436A (en) | 2020-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010461476.0A Pending CN111438436A (en) | 2020-05-27 | 2020-05-27 | Special floating stirring tool for friction stir welding |
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| Country | Link |
|---|---|
| CN (1) | CN111438436A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207422A (en) * | 2020-09-14 | 2021-01-12 | 湖南坤鼎数控科技有限公司 | Laminated packaging hardware based on stirring welding |
-
2020
- 2020-05-27 CN CN202010461476.0A patent/CN111438436A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207422A (en) * | 2020-09-14 | 2021-01-12 | 湖南坤鼎数控科技有限公司 | Laminated packaging hardware based on stirring welding |
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