CN110860783B - Device for improving axial bearing capacity of main shaft of friction stir welding equipment - Google Patents
Device for improving axial bearing capacity of main shaft of friction stir welding equipment Download PDFInfo
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- CN110860783B CN110860783B CN201911163247.4A CN201911163247A CN110860783B CN 110860783 B CN110860783 B CN 110860783B CN 201911163247 A CN201911163247 A CN 201911163247A CN 110860783 B CN110860783 B CN 110860783B
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- stirring head
- main shaft
- friction stir
- bearing
- axial
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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
Abstract
According to the device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment, the clamping end of the stirring head is in floating connection with the tool shank, and the stirring head can rotate and axially move along with the tool shank; a bearing is sleeved on the stirring head, and the inner ring of the bearing is in transition fit with the stirring head; the tool handle and the stirring head are sleeved with the switching sleeve, one end of the switching sleeve is connected with the main shaft shell, and the other end of the switching sleeve is in interference fit with the outer ring of the bearing; the stirring head is in threaded connection with a threaded sleeve, and a bearing is supported on the threaded sleeve. The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment improves the axial bearing capacity of the main shaft and increases the welding capacity of the original equipment under the condition of not changing the structure of the main shaft of the original welding equipment.
Description
Technical Field
The invention relates to the field of friction stir welding, in particular to a device for improving the axial bearing capacity of a main shaft of friction stir welding equipment.
Background
The friction stir welding is to generate heat through the rotational friction of a stirring head so that the material enters a plastic state, and then the stirring and local forging of the stirring head are used for causing the dynamic recrystallization of the connected material, thereby forming a compact welding line. The axial pressure of the stirring head on the welded workpiece is an important factor for ensuring the welding quality. For friction stir welding equipment, the axial pressure bearing capacity is a key indicator for determining the weld thickness. And the axial pressure in the welding process is mainly transmitted to a bearing group matched with the welding spindle through the stirring head, and the bearing capacity of the bearing group determines the welding capacity of the equipment. As the thickness of the work piece being welded increases, the axial pressure generated during the welding process also increases. When the bearing capacity of the bearing set of the existing equipment can not be met, the welding can not be generally carried out.
In order to weld workpieces with larger thickness, the prior art mainly adopts two methods of optimizing process parameters and modifying welding equipment. Research shows that the axial pressure in the welding process can be reduced by optimizing the technological parameters, so that workpieces with larger thickness can be welded on the original equipment. However, the process window obtained by the method is narrow, so that the welding process is unreliable, the welding quality is unstable, and the engineering application difficulty is high. For the reconstruction of the existing equipment, the welding main shaft needs to be redesigned and reconstructed except for the reconstruction of the machine tool. Due to the fact that the working condition of the welding main shaft is complex, the requirement on machining precision is high, the design period is long, and the reconstruction cost is high.
Disclosure of Invention
The invention aims to provide a device for improving the axial bearing capacity of a main shaft of friction stir welding equipment, which reduces the axial pressure borne by the main shaft and increases the welding capacity of the original equipment under the condition of not changing the structure of the main shaft of the original welding equipment.
In order to achieve the aim, the invention provides a device for improving the axial bearing capacity of a main shaft of friction stir welding equipment, wherein a clamping end of a stirring head is connected with a tool shank in a floating manner, and the stirring head can rotate and axially move along with the tool shank; a bearing is sleeved on the stirring head, and the inner ring of the bearing is in transition fit with the stirring head; the tool handle and the stirring head are sleeved with the switching sleeve, one end of the switching sleeve is connected with the main shaft shell, and the other end of the switching sleeve is in interference fit with the outer ring of the bearing; the stirring head is in threaded connection with a threaded sleeve, and a bearing is supported on the threaded sleeve.
According to the device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment, the key is installed at the clamping end of the stirring head, the groove is formed in the tool shank, and the key is in transition fit with the groove, so that the floating connection between the clamping end of the stirring head and the tool shank is realized.
The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment is characterized in that the length of the groove along the axial direction is L1The length of the key in the axial direction is L2，L1-L2≥2mm。
The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment assumes that the distance between the lower end surface of the clamping end of the stirring head and the lower end surface of the tool holder is L3，0.2mm≤L3≤0.5mm。
Above-mentioned promote friction stir welding equipment main shaft axial bearing capacity device, wherein, the bearing has a plurality ofly, and a plurality of bearings are piled up together along the axis direction, all overlap on the stirring head, and the inner circle of a plurality of bearings all with the stirring head transition fit, the outer lane of a plurality of bearings all with switching cover interference fit. The inner ring axial spacing of a plurality of bearings is realized to the thread bush, and the axial spacing of a plurality of bearing outer races is realized to the inside step face of switching cover.
Above-mentioned promote friction stir welding equipment main shaft axial bearing capacity device, wherein, processing the external screw thread on the lateral wall of stirring head, realize being connected of thread bush and stirring head.
The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment is characterized in that a threaded hole is machined in the clamping end of the stirring head, and the key is connected with the clamping end of the stirring head through the set screw and the threaded hole.
Compared with the prior art, the invention has the advantages that:
the device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment can reduce the axial pressure of the main shaft under the condition of not changing the original welding main shaft structure, thereby increasing the welding capacity of the original equipment and widening the application range;
according to the device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment, the bearing constraint is added on the stirring head, the radial deformation in the welding process is limited, the coaxiality of the stirring head and the main shaft is improved, and the service life of the stirring head and the quality of a welding seam are favorably improved.
Drawings
The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment is provided by the following embodiments and attached drawings.
FIG. 1 is a schematic view of a device for increasing axial bearing capacity of a spindle of a friction stir welding apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of a floating agitator head according to a preferred embodiment of the present invention.
Detailed Description
The device for improving the axial bearing capacity of the main shaft of the friction stir welding device is further described in detail with reference to fig. 1-2.
The existing friction stir welding equipment comprises a main shaft, a tool shank, a stirring head and a main shaft shell; the clamping end of the stirring head is fixedly connected with the tool handle, the main shaft is connected with the tool handle, and the main shaft is arranged in the main shaft shell; the main shaft rotates to drive the tool shank to rotate, and then the stirring head is driven to rotate. For the existing friction stir welding equipment, in the welding process, the transmission path of the axial pressure applied to the stirring head by the welded workpiece is as follows: transmitted to the main shaft and a bearing group matched with the main shaft through the stirring head and the tool shank.
The innovative thought of the invention is as follows: the bearing and the floating type stirring head are used for transmitting the overlarge axial pressure borne by the stirring head in the welding process to the main shaft shell connected with the adapter sleeve, so that the axial pressure is prevented from being applied to the main shaft only through the tool shank.
FIG. 1 is a schematic view of a device for increasing axial bearing capacity of a spindle of a friction stir welding apparatus according to a preferred embodiment of the present invention; FIG. 2 is a schematic diagram of a floating agitator head according to a preferred embodiment of the present invention.
This embodiment promotes friction stir welding equipment's main shaft axial pressure bearing capacity through reforming transform friction stir welding equipment.
Referring to fig. 1 and 2, the device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment in the embodiment includes an adapter sleeve 2, a bearing set 4, a threaded sleeve 5 and a key 7;
the bearing group 4 is sleeved on the stirring head 3 of the friction stir welding equipment, and the inner ring of the bearing group 4 is in transition fit with the stirring head 3, so that the stirring head 3 is convenient to disassemble;
the adapter sleeve 2 is sleeved outside a tool shank 6 and a stirring head 3 of the friction stir welding equipment and is positioned between a main shaft shell 1 and the bearing group 4 of the friction stir welding equipment; one end of the adapter sleeve 2 is connected with the main shaft shell 1, and the other end of the adapter sleeve 2 is in interference fit with the outer ring of the bearing group 4, namely, the main shaft shell 1 is supported on the adapter sleeve 2, and the adapter sleeve 2 is supported on the bearing group 4;
the threaded sleeve 5 is sleeved on the stirring head 3 and is in threaded connection with the stirring head 3, namely, external threads are processed on the corresponding outer side wall of the stirring head 3, and the threaded sleeve 5 is connected with the stirring head 3 through the external threads; the bearing set 4 is supported on the threaded sleeve 5, and the threaded sleeve 5 is used for limiting the axial movement of the bearing set 4;
the key 7 is arranged at the clamping end of the stirring head 3, a groove is formed in the tool shank 6, and the key 7 is in transition fit with the groove; preferably, a threaded hole is machined in the clamping end of the stirring head 3, and the key 7 is connected with the clamping end of the stirring head 3 through a set screw 8 and the threaded hole.
Referring to fig. 2, a groove is formed on the shank 6, a key 7 mounted at the clamping end of the mixing head 3 is placed in the groove, the key 7 is in transition fit with the groove, and the length of the groove along the axial direction is assumed to be L1And the length of the key 7 in the axial direction is L2，L1＝15mm，L2The stirring head 3 was made axially movable by 12 mm. The distance between the lower end surface of the clamping end of the stirring head and the lower end surface of the tool holder is assumed to be L3，L30.3 mm. Through transforming, stirring head 3 and handle of a knife 6 are floated and are connected, and stirring head 3 becomes floating stirring head, and stirring head 3 no longer is fixed connection with handle of a knife 6.
Preferably, the bearing set 4 adopts an angular contact ball bearing; the bearing group 4 can comprise a plurality of bearings which are stacked together along the axial direction and are all sleeved on the stirring head 3, and inner rings of the plurality of bearings are all in transition fit with the stirring head 3; and the outer rings of the bearings are in interference fit with the adapter sleeve 2. The inner ring axial spacing of a plurality of bearings is realized to the thread bush, and the axial spacing of a plurality of bearing outer races is realized to the inside step face of switching cover. Increasing the number of bearings increases the axial pressure carrying capacity of the device.
In the welding process, when the main shaft of the friction stir welding equipment drives the stirring head 3 to rotate and tie down, the axial acting force generated by the welded workpiece is applied to the stirring head 3. When the axial pressure is gradually increased, the bearing group 4 has axial clearance and the stirring head 3 is in a floating structure, so that L is3Reducing the axial pressure from 0.3mm to 0mm, wherein the main shaft bears the axial pressure; as the axial pressure continues to increase, the bearing set 4 begins to experience excessive axial pressure and transmits the axial pressure to the adapter sleeve 2 and, in turn, to the spindle housing 1. At this time, the axial pressure bearing capacity of the main shaft is the sum of the bearing group 4 and the bearing capacity of the main shaft. The bearing group 4 can improve the axial bearing capacity by increasing the number of the bearings, thereby greatly improving the axial pressure bearing capacity of the main shaft of the friction stir welding equipment.
The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment increases the axial bearing capacity of the main shaft and the welding capacity of the original equipment under the condition of not changing the structure of the original welding main shaft.
While the present invention has been described above in terms of preferred embodiments, it is to be understood that the invention includes, but is not limited to, the above embodiments. Other variations within the spirit of the invention and applications to fields not mentioned herein will occur to those skilled in the art. Such variations are, of course, within the spirit of the invention and are intended to be included within the scope of the invention as claimed.
Claims (4)
1. The device for improving the axial bearing capacity of the main shaft of the friction stir welding equipment is characterized in that a clamping end of a stirring head is in floating connection with a tool shank, and the stirring head can rotate and axially move along with the tool shank; a bearing is sleeved on the stirring head, and the inner ring of the bearing is in transition fit with the stirring head; the tool handle and the stirring head are sleeved with the switching sleeve, one end of the switching sleeve is connected with the main shaft shell, and the other end of the switching sleeve is in interference fit with the outer ring of the bearing; the stirring head is in threaded connection with a threaded sleeve, and a bearing is supported on the threaded sleeve; the clamping end of the stirring head is provided with a key, the handle is provided with a groove, and the key is in transition fit with the groove to form a solid structureThe clamping end of the existing stirring head is in floating connection with the tool shank; assuming that the length of the groove in the axial direction is L1The length of the key in the axial direction is L2，L1-L2≥2mm；
The stirring head is sleeved with the stirring shaft, the stirring shaft is provided with a plurality of bearings, the plurality of bearings are stacked together along the axis direction and are all sleeved on the stirring head, inner rings of the plurality of bearings are in transition fit with the stirring head, and outer rings of the plurality of bearings are in interference fit with the switching sleeve; the inner ring axial spacing of a plurality of bearings is realized to the thread bush, and the axial spacing of a plurality of bearing outer races is realized to the inside step face of switching cover.
2. The device for improving the axial bearing capacity of the main shaft of the friction stir welding device according to claim 1, wherein the distance between the lower end surface of the clamping end of the stirring head and the lower end surface of the tool shank is L3，0.2mm≤L3≤0.5mm。
3. The device for improving the axial bearing capacity of the main shaft of the friction stir welding device according to claim 1, wherein an external thread is processed on the outer side wall of the stirring head to realize the connection of the threaded sleeve and the stirring head.
4. The device for improving the axial bearing capacity of the main shaft of the friction stir welding device according to claim 1, wherein a threaded hole is processed at the clamping end of the stirring head, and the key is connected with the clamping end of the stirring head through the set screw and the threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911163247.4A CN110860783B (en) | 2019-11-25 | 2019-11-25 | Device for improving axial bearing capacity of main shaft of friction stir welding equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911163247.4A CN110860783B (en) | 2019-11-25 | 2019-11-25 | Device for improving axial bearing capacity of main shaft of friction stir welding equipment |
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| Publication Number | Publication Date |
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| CN110860783A CN110860783A (en) | 2020-03-06 |
| CN110860783B true CN110860783B (en) | 2021-10-01 |
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| CN201911163247.4A Active CN110860783B (en) | 2019-11-25 | 2019-11-25 | Device for improving axial bearing capacity of main shaft of friction stir welding equipment |
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| CN113977068B (en) * | 2021-11-22 | 2023-04-07 | 西南技术工程研究所 | Rotary tool head and floating device thereof |
Citations (6)
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| CN102744518A (en) * | 2012-06-29 | 2012-10-24 | 徐晓菱 | Radial friction welder positioning tool |
| CN104985320A (en) * | 2015-06-23 | 2015-10-21 | 唐远金 | Friction-stir welding equipment |
| CN106001902A (en) * | 2016-06-20 | 2016-10-12 | 江苏科技大学 | Extruding speed-adjustable filling friction stir welding device |
| KR101886692B1 (en) * | 2016-12-30 | 2018-09-11 | 부산대학교 산학협력단 | High frequency spindle for friction stir welding |
| CN109396635A (en) * | 2018-10-23 | 2019-03-01 | 上海航天设备制造总厂有限公司 | A kind of Integral corner weld seam friction stir welding tool and method |
| CN109986195A (en) * | 2019-04-03 | 2019-07-09 | 天津大学 | Friction stir welding spindle head mechanism for parallel robot |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10099314B2 (en) * | 2016-03-18 | 2018-10-16 | Toshiba Kikai Kabushiki Kaisha | Tool holder and machine tool |
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2019
- 2019-11-25 CN CN201911163247.4A patent/CN110860783B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744518A (en) * | 2012-06-29 | 2012-10-24 | 徐晓菱 | Radial friction welder positioning tool |
| CN104985320A (en) * | 2015-06-23 | 2015-10-21 | 唐远金 | Friction-stir welding equipment |
| CN106001902A (en) * | 2016-06-20 | 2016-10-12 | 江苏科技大学 | Extruding speed-adjustable filling friction stir welding device |
| KR101886692B1 (en) * | 2016-12-30 | 2018-09-11 | 부산대학교 산학협력단 | High frequency spindle for friction stir welding |
| CN109396635A (en) * | 2018-10-23 | 2019-03-01 | 上海航天设备制造总厂有限公司 | A kind of Integral corner weld seam friction stir welding tool and method |
| CN109986195A (en) * | 2019-04-03 | 2019-07-09 | 天津大学 | Friction stir welding spindle head mechanism for parallel robot |
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