CN111375886A - Cooling device of friction welding stirring head - Google Patents
Cooling device of friction welding stirring head Download PDFInfo
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- CN111375886A CN111375886A CN202010235823.8A CN202010235823A CN111375886A CN 111375886 A CN111375886 A CN 111375886A CN 202010235823 A CN202010235823 A CN 202010235823A CN 111375886 A CN111375886 A CN 111375886A
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- cooling
- stirring head
- friction welding
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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
- B23K20/26—Auxiliary equipment
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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
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- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a cooling device of a friction welding stirring head, relating to the technical field of welding processing and comprising: mount, cooling column and coolant provide the device, the mount is fixed to be set up, the cooling column is fixed to be set up on the mount, just the fixed cover of cooling column is established at the stirring head outside, the inside cooling chamber that is provided with of cooling column, coolant provide the device with cooling chamber intercommunication, be used for to cooling column input coolant. Therefore, the invention overcomes the defects of the existing stirring head cooling device that the stirring head load is increased, the service life of the stirring head is shortened and the cooling effect is poor, and not only can the temperature of the stirring head be reduced, the service life of the stirring head be prolonged, but also the pollution to a workbench can be avoided.
Description
Technical Field
The invention relates to the technical field of welding processing, in particular to a cooling device of a stirring head for friction welding.
Background
Friction Stir Welding (FSW) is a solid phase joining technique, and compared with the conventional fusion welding method, the material is not melted during welding, so that the fusion welding defects such as large deformation, air holes and the like are fundamentally avoided, and the FSW has the advantages of high welding quality, strong automation and the like, and is a reliable joining technique. Therefore, the invention has been widely applied to the manufacturing fields of automobiles, ships, aerospace and the like for twenty years. With the development of the technology, the application range of the alloy is gradually expanded from low-melting-point metals such as aluminum alloy and the like to high-melting-point materials such as titanium alloy and the like. But also encounters a plurality of problems, such as the easy abrasion of the stirring head at high temperature, the reduction of the service life of the stirring head, the serious influence on the quality of the welding joint and the like.
Aiming at the problems of high-melting-point metals such as titanium alloy and the like in friction stir welding, the original solution is to replace materials with better heat resistance and wear resistance, such as PCBN, nickel-based high-temperature alloy and the like, but researches of researchers find that the effects generated by adopting the materials are limited, and new problems can be generated, such as PCBN can be dissolved at high temperature to generate chemical reaction with base materials and the like. And even if a proper stirring head is adopted, such as the tungsten-rhenium alloy stirring head which is most commonly used at present, the high-temperature abrasion of the stirring head is still serious.
And because titanium alloy's heat conductivity is low for the heat that the stirring head produced mostly passes through the centre gripping handle and transmits to the main shaft, makes the main shaft temperature rise, when heat accumulation to a certain extent, can reduce the life of main shaft, finally makes welding equipment can not normal use. Therefore, it is necessary to cool the stirring head by using a cooling device.
At present, common cooling modes mainly comprise water spraying cooling, underwater welding, internal cooling and the like. In general, the internal cooling is performed by water cooling, and as disclosed in chinese patent applications No. 201710612400.1 and No. 201711306083.7, a coolant inlet pipe and a coolant outlet pipe are provided at the center of the stirring head to circulate and cool the coolant. On the other hand, the hollow stirring head is difficult to machine and manufacture, and meanwhile, in the welding process, the stirring head is subjected to large load and abrasion, so that the machining times of the stirring head are reduced, and the service life of the stirring head is shortened.
The cooling principle of water spray cooling and underwater welding are the same, but the water spray cooling easily pollutes the workbench and is difficult to clean after welding. Although underwater welding is pollution-free, the operations of clamping, welding, sealing and the like are difficult, and the plasticizing degree of the welded metal is low due to the good cooling effect, so that the abrasion degree of the stirring head is increased. Moreover, the two have a common problem that when welding a titanium alloy, a brittle compound is generated at a joint due to a gettering effect of the titanium alloy at a high temperature, thereby deteriorating the quality of the joint. According to the research of the Wangwen and the like, when the friction stir welding method is used for cooling the titanium alloy, the forming is poor, O, H and the like in a cooling medium can be absorbed, the temperature is low, the metal fluidity is poor, the plasticity is poor, and the welding quality of a welding line is reduced.
Disclosure of Invention
The invention aims to provide a cooling device of a stirring head for friction welding, which solves the problems in the prior art, can reduce the temperature of the stirring head, prolong the service life of the stirring head and avoid polluting a workbench.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a cooling device of a friction welding stirring head, which comprises a fixing frame, a cooling column and a cooling medium supply device, wherein the fixing frame is fixedly arranged, the cooling column is fixedly arranged on the fixing frame and fixedly sleeved outside the stirring head, a cooling cavity is arranged inside the cooling column, and the cooling medium supply device is communicated with the cooling cavity and is used for inputting a cooling medium into the cooling cavity.
Preferably, the cooling device of the friction welding stirring head further comprises a heat conduction whisker, one end of the heat conduction whisker is fixedly connected to the inner side wall of the cooling column, and the other end of the heat conduction whisker is in contact with the stirring head.
Preferably, the number of the heat conducting whiskers is multiple.
Preferably, the cooling column is a copper column.
Preferably, the heat conduction whiskers are copper whiskers.
Preferably, the cooling medium supply device is a liquid nitrogen tank.
Preferably, the cross section of the cooling cavity is annular, and the cooling cavity is coaxial with the stirring head; and a cooling medium inlet is formed in the lower part of the cooling cavity, and a cooling medium outlet is formed in the upper part of the cooling cavity.
Preferably, the cooling device of the friction welding stirring head further comprises a low-temperature stop valve, the cooling medium supply device is connected with the cooling cavity in a sealing mode through an input pipe, and the low-temperature stop valve is arranged on the input pipe.
Preferably, the cooling device of the friction welding stirring head further comprises an output pipe, a temperature sensor, a pneumatic low-temperature regulating valve and a controller, wherein one end of the output pipe is hermetically connected with the cooling medium output port, the temperature sensor is arranged at the cooling medium output port, the pneumatic low-temperature regulating valve is arranged on the output pipe, and the temperature sensor and the pneumatic low-temperature regulating valve are electrically connected with the controller.
Preferably, the input pipe and the output pipe are both provided with heat insulation layers.
Compared with the prior art, the invention has the following technical effects:
the invention provides a cooling device of a friction welding stirring head, which comprises a fixing frame, a cooling column and a cooling medium supply device, wherein the cooling column is fixedly arranged on the fixing frame, the cooling column is fixedly sleeved outside the stirring head, so that the increase of the load of the stirring head can be avoided, a cooling cavity is arranged in the cooling column for prolonging the service life of the stirring head, the cooling medium supply device is communicated with the cooling cavity, cooling medium is input into the cooling cavity, and the cooling medium in the cooling cavity is used for cooling the stirring head.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a sectional view of a cooling apparatus of a friction welding pin according to the present invention;
FIG. 2 is a plan view of a cooling apparatus for a friction welding pin according to the present invention.
Wherein: 1-stirring head, 2-heat conducting whisker, 3-cooling column, 4-cooling cavity, 5-cooling medium input port and 6-cooling medium output port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a cooling device of a stirring head for friction welding, which is used for solving the problems in the prior art, reducing the temperature of the stirring head, prolonging the service life of the stirring head and avoiding polluting a workbench.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in FIGS. 1-2: the embodiment provides a cooling device of a friction welding stirring head 1, which comprises a fixed frame, a cooling column 3 and a cooling medium supply device, wherein the fixed frame is fixedly arranged, the cooling column 3 is fixedly arranged on the fixed frame, the cooling column 3 is fixedly sleeved outside the stirring head 1, the existing stirring head can be used, secondary processing is not needed to be carried out on the stirring head 1, the condition that the service life of the stirring head is shortened due to the increase of the load of the stirring head 1 is avoided, a cooling cavity 4 is arranged inside the cooling column 3, and the cooling medium supply device is communicated with the cooling cavity 4 and is used for inputting cooling medium into the cooling cavity 4, so that compared with the existing water spraying cooling and underwater welding, the quality of the stirring head 1 cannot be reduced, and a workbench cannot be polluted, therefore, the invention can reduce the temperature of the stirring head 1, prolong the service life of the stirring head 1, and reduce the temperature of the stirring head 1, thereby being beneficial to improving the welding quality and reducing the abrasion of the stirring head 1.
Friction welding is with cooling device of stirring head 1 still includes heat conduction palpus 2, and 2 one end fixed connection of heat conduction palpus are in 3 inside walls of cooling column, preferentially adopt the energy storage to weld 2 one ends of heat conduction palpus and weld on 3 inside walls of cooling column, and the other end contacts with stirring head 1 for heat conduction, in order to improve the cooling effect to the stirring head.
The number of the heat conducting whiskers 2 is multiple.
The cooling column 3 is a copper column.
The heat conductive whiskers 2 are copper whiskers.
The cooling medium supply device is a liquid nitrogen tank, and liquid nitrogen is used as the cooling medium, so that the cooling effect on the stirring head 1 can be improved.
The cross section of the cooling cavity 4 is annular, and the cooling cavity 4 is coaxial with the stirring head 1; a cooling medium inlet 5 is arranged at the lower part of the cooling cavity 4, and a cooling medium outlet 6 is arranged at the upper part of the cooling cavity 4.
Friction welding is with cooling device of stirring head 1 still includes the low temperature stop valve, and the coolant provides the device and passes through input tube and 4 sealing connection in cooling chamber, and is concrete, and the mouth of pipe at input tube both ends all is provided with the sealing washer to avoid gas leakage, in order to carry out the heat exchange with the outside air, influence cooling efficiency, the low temperature stop valve sets up on the input tube, needs manually to open and close.
The cooling device of the friction welding stirring head 1 further comprises an output pipe, a controller, a temperature sensor and a pneumatic low-temperature regulating valve, wherein one end of the output pipe is hermetically connected with the cooling medium output port 6, and particularly, pipe orifices at two ends of the output pipe are respectively provided with a sealing ring to realize sealed connection, so that air leakage is avoided, heat exchange with external air is avoided, and cooling efficiency is not influenced; pneumatic low temperature adjustment valve sets up on the output tube, temperature sensor sets up on coolant delivery outlet 6, temperature sensor and pneumatic low temperature adjustment valve all are connected with the controller electricity, temperature sensor is used for monitoring the coolant temperature of the output of coolant delivery outlet 6, and carry the monitoring value for the controller, the controller judges whether reach the setting value according to the monitoring value, when the monitoring temperature reaches the setting value, the controller sends signal control pneumatic low temperature adjustment valve and opens, make the high temperature gas of cooling chamber 4 outside output, make the liquid nitrogen get into in the cooling chamber 4, thereby guarantee the temperature of the coolant in cooling chamber 4, and then guarantee the cooling effect to the stirring head.
The input pipe and the output pipe are both provided with heat-insulating layers, and the input pipe and the output pipe are preferably copper pipes.
The working process is as follows:
A. a preheating stage: and (3) turning on the friction stir welding motor to enable the stirring head 1 to rotate, preheating the stirring head 1, and temporarily stopping opening the liquid nitrogen tank at the stage to prevent the stirring head 1 from being severely worn or even kinked due to too low temperature in the process of inserting the stirring head 1 into the workpiece.
B. And after welding is started, the liquid nitrogen pump is opened, the low-temperature stop valve on the input pipe on the liquid nitrogen tank is manually opened, but the opening degree is small, so that the cooling copper cylinder is not chilled, and then the low-temperature stop valve is completely opened.
C. Liquid nitrogen is sent into the copper column, and heat is conducted through the copper whisker to start cooling the stirring head 1.
D. Meanwhile, the temperature sensor at the output port of the copper column starts to work, when the temperature of the temperature sensor is higher than-100 ℃, a signal is sent to the controller, the pneumatic low-temperature regulating valve is controlled to be opened through the controller, nitrogen with higher temperature is released, liquid nitrogen is supplemented into the copper column, the temperature is reduced, and the cooling efficiency and the cooling effect are guaranteed.
E. A stopping stage: when the welding stops, when the stirring head 1 starts to lift and leaves the workpiece, the liquid nitrogen pump is closed, when the pressure gauge on the liquid nitrogen tank is 0, the low-temperature stop valve on the input pipe is closed, then the friction stir welding motor is closed, and the welding is stopped.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a cooling device of friction welding stirring head which characterized in that: including mount, cooling column and coolant supply device, the mount is fixed to be set up, the cooling column is fixed to be set up on the mount, just the fixed cover of cooling column is established in the stirring head outside, the inside cooling chamber that is provided with of cooling column, coolant supply device with cooling chamber intercommunication, be used for to cooling intracavity input coolant.
2. The cooling device for a friction welding tool according to claim 1, wherein: still include the heat conduction palpus, heat conduction palpus one end fixed connection in the cooling column inside wall, the heat conduction palpus other end with the stirring head contacts.
3. The cooling device for a friction welding tool according to claim 2, wherein: the number of the heat conduction whiskers is multiple.
4. The cooling device for a friction welding tool according to claim 1, wherein: the cooling column is a copper column.
5. The cooling device for a friction welding tool according to claim 2, wherein: the heat conduction whiskers are copper whiskers.
6. The cooling device for a friction welding tool according to claim 1, wherein: the cooling medium supply device is a liquid nitrogen tank.
7. The cooling device for a friction welding tool according to claim 1, wherein: the cross section of the cooling cavity is annular, and the cooling cavity is coaxial with the stirring head; and a cooling medium inlet is formed in the lower part of the cooling cavity, and a cooling medium outlet is formed in the upper part of the cooling cavity.
8. The cooling device for a friction welding tool according to claim 7, wherein: the cooling medium supply device is connected with the cooling cavity in a sealing mode through an input pipe, and the low-temperature stop valve is arranged on the input pipe.
9. The cooling device for a friction welding tool according to claim 7, wherein: the cooling system is characterized by further comprising an output tube, a temperature sensor, a pneumatic low-temperature regulating valve and a controller, wherein one end of the output tube is hermetically connected with the cooling medium output port, the temperature sensor is arranged at the cooling medium output port, the pneumatic low-temperature regulating valve is arranged on the output tube, and the temperature sensor and the pneumatic low-temperature regulating valve are electrically connected with the controller.
10. The cooling device for a friction welding tool according to claim 9, wherein: and the input pipe and the output pipe are both provided with heat insulation layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235823.8A CN111375886A (en) | 2020-03-30 | 2020-03-30 | Cooling device of friction welding stirring head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235823.8A CN111375886A (en) | 2020-03-30 | 2020-03-30 | Cooling device of friction welding stirring head |
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| Publication Number | Publication Date |
|---|---|
| CN111375886A true CN111375886A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010235823.8A Pending CN111375886A (en) | 2020-03-30 | 2020-03-30 | Cooling device of friction welding stirring head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113967783A (en) * | 2021-10-22 | 2022-01-25 | 南京工业大学 | Coaxial spray cooling coupling auxiliary FSW device and using method |
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| CN101537538A (en) * | 2009-04-24 | 2009-09-23 | 重庆大学 | Integrated pin tool for friction stir welding and composite method of resistance-friction stir welding thereof |
| CN103212779A (en) * | 2013-04-19 | 2013-07-24 | 西安建筑科技大学 | Mixing friction welding device of cooling protective mixing head and welded workpiece |
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| CN105834577A (en) * | 2016-06-20 | 2016-08-10 | 江苏通宇钢管集团有限公司 | Steel pipe friction stir welding device based on pressure feedback and resistive auxiliary heating as well as welding method |
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2020
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| CN103846563A (en) * | 2012-11-29 | 2014-06-11 | 上海航天设备制造总厂 | Laser stirring friction welding method and device thereof |
| CN103212779A (en) * | 2013-04-19 | 2013-07-24 | 西安建筑科技大学 | Mixing friction welding device of cooling protective mixing head and welded workpiece |
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| CN105834577A (en) * | 2016-06-20 | 2016-08-10 | 江苏通宇钢管集团有限公司 | Steel pipe friction stir welding device based on pressure feedback and resistive auxiliary heating as well as welding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113967783A (en) * | 2021-10-22 | 2022-01-25 | 南京工业大学 | Coaxial spray cooling coupling auxiliary FSW device and using method |
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Application publication date: 20200707 |