CN112548313A - Welding tool and method for processing internal flow channel by using friction stir processing technology - Google Patents
Welding tool and method for processing internal flow channel by using friction stir processing technology Download PDFInfo
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- CN112548313A CN112548313A CN202011382084.1A CN202011382084A CN112548313A CN 112548313 A CN112548313 A CN 112548313A CN 202011382084 A CN202011382084 A CN 202011382084A CN 112548313 A CN112548313 A CN 112548313A
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- 238000012545 processing Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000003466 welding Methods 0.000 title claims abstract description 41
- 238000005516 engineering process Methods 0.000 title claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 11
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- 230000008569 process Effects 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012815 thermoplastic material Substances 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 6
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- 229910000881 Cu alloy Inorganic materials 0.000 description 1
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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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- 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
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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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- 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
Abstract
The invention discloses a welding tool and a method for processing an internal flow passage by using a friction stir processing technology, wherein the welding tool for processing the internal flow passage by using the friction stir processing technology comprises an installation body, a shaft shoulder and a stirring pin, wherein the shaft shoulder and the stirring pin are rotary bodies, one axial end of the shaft shoulder is fixedly connected with the installation body, the stirring pin is coaxially and fixedly connected with the other end of the shaft shoulder, which is far away from the installation body, a hollow channel is formed in the stirring pin, a side opening is formed in the circumferential side surface of the stirring pin, and the side opening is communicated with the hollow channel; the circumferential side surface of the shaft shoulder is provided with a shaft shoulder through hole, and the shaft shoulder through hole is communicated with the hollow channel. According to the welding tool and the method for processing the internal flow channel by using the friction stir processing technology, the thermoplastic material can be discharged outwards through the internal channel of the welding tool in the processing process by using the friction stir processing technology, the closed water flow channel can be directly processed on the part, the process is simple, time and labor are saved, the production efficiency is improved, and the processing cost is reduced.
Description
Technical Field
The invention relates to the technical field of inner runner processing, in particular to a welding tool and a method for processing an inner runner by using a friction stir processing technology.
Background
With the rise of new energy vehicles, 5G and other technologies, the density of parts such as batteries and electronic components is further improved, and the heat productivity of electric parts is larger in the working process. The heat generated by the electrical components needs to be conducted out in time or damage to the components can occur. At present, materials with good heat conductivity, such as aluminum alloy, copper alloy and the like, are generally adopted to be in contact with electrical parts, heat is taken out through liquid or gas, the parts can be cooled in real time, and stable work of the parts is guaranteed.
At present, parts with cooling flow channels are mainly processed in two modes, one mode is winding water-cooling pipes, and the other mode is that water flow channels are directly processed on the parts and then are sealed by cover plates.
The patents CN108448802A and CN108539908A disclose a method of water cooling a motor casing by winding water cooling pipes. The motor casing includes shell body, interior casing and circulating pipe, circulating pipe spiral winding in interior casing surface and with interior casing fixed connection, the shell body cup joints in interior casing and circulating pipe outside, the shell body surface is equipped with water inlet and delivery port, water inlet and delivery port respectively with circulating pipe intercommunication. However, when the water cooling pipe is wound to cool the part, the water cooling pipe and the part are in contact with each other, and the surface roughness and the contact state of the contact surface have a large influence on heat conduction, resulting in low cooling efficiency.
The patents CN109286269A and CN109952001A directly process the water flow channel on the parts, and then seal the water flow channel by welding. Wherein, the patent of publication No. CN109286269A is water-cooling motor casing, and casing circumference water course is machine-shaping, then seals the intercommunication water course with a plurality of arc form aluminum alloy block welding, and the intercommunication water course encircles and arranges in whole casing. Patent publication No. CN109952001A is a water cooling plate, in which a circulation port is formed on the peripheral side surface of a substrate, flow channels are formed on the upper and lower side surfaces of the substrate, the flow channels are formed by machining, and then corresponding cover plates are welded to the flow channels, so that the flow channels are closed flow channels and are connected to external water pipes only through the circulation ports on the side surfaces. The method has the advantages that the water flow channel is directly machined on the part, then the cover plate is used for sealing the water flow channel, the heat dissipation efficiency of the water flow channel in a winding mode is high, the method needs to machine and form the water flow channel firstly, then the water flow channel is covered in a welding mode, only the water inlet and the water outlet are reserved, multiple machining processes are needed, the process is complex, time and labor are wasted, the machining cost is high, the stress concentration phenomenon easily occurs at the lap joint interface of the cover plate and the water flow channel welding line, and the service life of the part is influenced.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a welding tool and a method for processing an internal flow passage by using a friction stir processing technology, which can directly process a closed water flow passage on a part, omit a cover plate welding procedure, have simple process, save time and labor, solve the problems of complex processing process and more procedures of a water-cooled motor shell, a water-cooled radiator and the like of the internal flow passage, improve the production efficiency of the part with the internal flow passage, reduce the processing cost and have strong practicability.
In order to achieve the above object, on one hand, the invention provides a welding tool for processing an internal flow channel by using a friction stir processing technology, which comprises an installation body, a shaft shoulder and a stirring pin, wherein the shaft shoulder and the stirring pin are revolved bodies, one axial end of the shaft shoulder is fixedly connected with the installation body, and the stirring pin is coaxially and fixedly connected with the other end of the shaft shoulder, which is far away from the installation body; the circumference side of the shaft shoulder is provided with a shaft shoulder through hole, and the shaft shoulder through hole is communicated with the hollow channel.
In one example, the end surface of the stirring pin is further provided with an end surface opening, and the end surface opening is communicated with the hollow channel.
In one example, at least two side openings are formed in the circumferential side surface of the stirring pin, and the side openings are distributed in a central symmetry mode relative to the axis of the stirring pin; the circumferential side surface of the stirring pin is also provided with a diversion trench along the radial tangential direction, and the diversion trench is arranged on the same side of the side surface open pore along the circumferential direction of the stirring pin and is communicated with the side surface open pore.
In one example, the inner diameter of the end opening is less than 2/3 of the end diameter of the pin, and the inner diameter of the hollow passage and the inner diameter of the shoulder through hole are greater than the inner diameter of the end opening.
In one example, the inside diameter of the side opening is less than 2/3 of the length of the pin, and the inside diameter of the hollow passage and the inside diameter of the shoulder through bore are greater than the inside diameter of the side opening.
In one example, the outer diameter of the end surface of the shaft shoulder, which is connected with the stirring pin, is larger than 1.2 times of the outer diameter of the root part of the stirring pin.
In one example, the circumferential side of the pin and the shoulder between the side opening and the root of the pin are further provided with threads.
In one example, the mounting body, the shoulder and the pin are of unitary construction.
In another aspect, the present invention further provides a method for processing an internal flow channel by using a friction stir processing technique, where the welding tool for processing an internal flow channel by using a friction stir processing technique as described in any one of the above descriptions includes the following steps:
step one, mounting a welding tool on a rotary driving device through a mounting body, and clamping and fixing a workpiece to be processed;
secondly, the rotary driving device drives the welding tool to rotate around the axis of the stirring pin, then the stirring pin is completely inserted into the workpiece to be processed, the shaft shoulder is in contact with the surface of the workpiece, set pressure exists, the stirring effect of the welding tool enables the workpiece material at the stirring pin to be heated and softened, the plastic material in the workpiece flows into the hollow channel through the side opening of the stirring pin and is extruded out through the through hole of the shaft shoulder, and the upper layer material of the workpiece forms a new workpiece surface under the driving of the shaft shoulder and the stirring pin;
and thirdly, moving the welding tool relative to the workpiece in parallel to the surface of the workpiece, so as to machine an internal flow channel in the workpiece.
In one example, the end surface of the stirring pin is further provided with an end surface opening, and the end surface opening is communicated with the hollow channel; at least two side openings are formed in the circumferential side surface of the stirring pin, and the side openings are distributed in a centrosymmetric manner with the axis of the stirring pin; the circumferential side surface of the stirring pin is also provided with a diversion trench along the radial tangential direction, and the diversion trench is arranged on the same side of the side surface opening hole along the circumferential direction of the stirring pin and is communicated with the side surface opening hole; the rotating direction of the stirring needle is consistent with the opening direction of the diversion trench.
The welding tool and the method for processing the internal flow passage by using the friction stir processing technology provided by the invention can bring the following beneficial effects:
1. the internal flow passage part is compared in the winding water-cooling tube mode, avoids the problem that solid contact heat transfer efficiency is low, and rivers direct cooling part, heat transfer efficiency is high. The welding tool is characterized in that a hollow channel and a side opening are formed in the inner part of the stirring needle, a shaft shoulder through hole is formed in the side face of the shaft shoulder, when the welding tool for processing the internal flow channel by using a friction stir processing technology is used, the side opening of the stirring needle is located in the part, the shaft shoulder through hole is located outside the part, the side opening and the shaft shoulder through hole are communicated through the hollow channel, so that the side opening is communicated with the outside, thermoplastic materials can be discharged outwards through the inner channel of the welding tool in the processing process of using the friction stir processing technology, a continuous flow channel can be directly processed in the solid material, a closed water flow channel can be directly processed on the part, compared with a mode of sealing the water flow channel by using a cover plate, the welding procedure of the cover plate and the flow channel is omitted, one-step forming production of the internal flow channel part is realized, the process is simple, time and labor are saved, and the, The problem that the process is many promotes the production efficiency that has the inside runner part, reduces the processing cost, and the rivers way that processes out moreover does not have the stress concentration condition under inside hydraulic effect, promotes product quality, increases the life of part, and the practicality is strong.
2. Through setting up the terminal surface trompil, can extrude the plastic material of stirring needle downside by the terminal surface trompil, increase passageway flow promotes plastic material's flow, and plastic material discharges with higher speed, promotes inside runner forming speed, and the practicality is strong.
3. Through side trompil and the guiding gutter that sets up central symmetry, can lead to plastic material's flow, promote plastic material's flow, reduce stirring resistance, avoid appearing the random flow, inside runner surface shaping quality is better, and the practicality is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic perspective view of a bonding tool for processing an internal flow channel by friction stir processing according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a bonding tool for processing an internal flow passage using a friction stir processing technique according to an embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic perspective view of a bonding tool for processing an internal flow channel by friction stir processing according to another embodiment of the present invention;
FIG. 5 is a cross-sectional view of a bonding tool for processing an internal flow passage using a friction stir processing technique according to another embodiment of the present invention;
FIG. 6 is an enlarged partial cross-sectional view of a bonding tool for processing an internal flow passage using a friction stir processing technique in accordance with another embodiment of the present invention;
fig. 7 is a sectional view of the stirring pin at the guide groove according to the embodiment of the present invention.
Detailed Description
In order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for ease of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description of the present specification, reference to the description of the terms "one aspect," "some aspects," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the aspect or example is included in at least one aspect or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same solution or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more aspects or examples.
The arrows in fig. 3 and 6 indicate the direction of flow of the thermoplastic material during processing; "●" and ″ "in fig. 6 indicate the rotation direction of the pin; the arrow in fig. 7 indicates the direction of rotation of the stirring pin.
As shown in fig. 1 to 7, an embodiment of the present invention provides a welding tool 100 for processing an internal flow channel by using a friction stir processing technique, which includes an installation body 1, a shaft shoulder 2 and a stirring pin 3, wherein the shaft shoulder 2 and the stirring pin 3 are rotation bodies, and one axial end of the shaft shoulder 2 is fixedly connected with the installation body 1; the stirring pin 3 is coaxially and fixedly connected to the other end, far away from the mounting body 1, of the shaft shoulder 2, a hollow channel 31 is formed in the stirring pin 3, a side opening 32 is formed in the circumferential side face of the stirring pin 3, and the side opening 32 is communicated with the hollow channel 31; the circumferential side surface of the shaft shoulder 2 is provided with a shaft shoulder through hole 21, and the shaft shoulder through hole 21 is communicated with the hollow channel 31.
The internal flow passage part is compared with a winding water-cooling pipe mode, the problem that solid contact heat transfer efficiency is low is solved, the part is directly cooled by water flow, and heat transfer efficiency is high. The inner part of the stirring pin 3 is provided with the hollow channel 31 and the side surface is provided with the side surface open pore 32, the side surface of the shaft shoulder 2 is provided with the shaft shoulder through hole 21, when the welding tool 100 for processing the inner flow channel by using the friction stir processing technology is used, the side surface open pore 32 of the stirring pin 3 is positioned in the part 200, the shaft shoulder through hole 21 is positioned outside the part 200, the side surface open pore 32 is communicated with the shaft shoulder through hole 21 through the hollow channel 31, so that the side surface open pore 32 is communicated with the outside, thermoplastic materials can be discharged outwards through the inner channel of the welding tool in the processing process by using the friction stir processing technology, a continuous flow channel can be directly processed in the solid material, a closed water flow channel can be directly processed on the part 200, compared with the mode of sealing the water flow channel by using a cover plate, the welding procedure of the cover plate and the flow channel is omitted, the processing method is simple in process, time-saving and labor-saving, solves the problems that the processing process of parts such as the water-cooled motor shell and the water-cooled radiator with the internal flow channel is complex and the number of working procedures is large, improves the production efficiency of the parts 200 with the internal flow channel, reduces the processing cost, enables the processed water flow channel to have no stress concentration under the action of internal water pressure, improves the product quality, prolongs the service life of the parts 200, and is high in practicability.
In one embodiment, the side opening 32 is a through hole penetrating the circumferential side of the stirring pin 3 in the radial direction, and the processing is simple and convenient.
Specifically, the end surface of the stirring pin 3 is further opened with an end surface opening 33, and the end surface opening 33 is communicated with the hollow passage 31. Through setting up terminal surface trompil 33, can extrude the plastic material of stirring needle 3 downside by terminal surface trompil 33, increase the passageway flow, promote plastic material's flow, plastic material discharges with higher speed, promotes inside runner forming speed, and the practicality is strong.
Specifically, at least two side surface openings 32 are formed in the circumferential side surface of the stirring pin 3, and the side surface openings 32 are distributed in a centrosymmetric manner relative to the axis of the stirring pin 3; the circumferential side surface of the stirring pin 3 is further provided with a diversion trench 34 along the radial tangential direction, and the diversion trench 34 is arranged on the same side of the side surface opening hole 32 along the circumferential direction of the stirring pin 3 and is communicated with the side surface opening hole 32. Through side trompil 32 and the guiding gutter 34 that sets up central symmetry, can lead to plastic material's flow, promote plastic material's flow, reduce the stirring resistance, avoid appearing indiscriminate stream, inside runner surface shaping quality is better, and the practicality is strong.
In one embodiment, the inner diameter of channels 34 is equal to the inner diameter of side openings 32.
Specifically, the inner diameter of the end face opening 33 is smaller than 2/3 of the end face diameter of the agitating pin 3, and the inner diameter of the hollow passage 31 and the inner diameter of the shoulder through hole 21 are larger than the inner diameter of the side face opening 32. Make the internal diameter of terminal surface trompil 33 as far as possible big to increase plastic material's discharge rate, guarantee the structural strength and the life of pin 3 simultaneously, the practicality is strong.
Specifically, the inner diameter of the side opening 32 is smaller than 2/3 of the length of the pin 3, and the inner diameter of the hollow passage 31 and the inner diameter of the shoulder through hole 21 are larger than the inner diameter of the side opening 32. Make the internal diameter of side trompil 32 as far as possible big to increase plastic material's discharge rate, guarantee the structural strength and the life of pin 3 simultaneously, the practicality is strong.
Specifically, the outer diameter of the end surface of the shoulder 2, to which the pin 3 is connected, is greater than 1.2 times the outer diameter of the root of the pin 3. Guarantee that shaft shoulder 2 can compress tightly the inside runner of closed part completely, avoid plastic material to extrude and the slot defect appears from 2 edges of shaft shoulder, guarantee the processingquality in inside tunnel, the practicality is strong.
Specifically, the circumferential side of the pin 3 between the side opening 32 and the root of the pin 3 and the shoulder 2 are also provided with threads. Through setting up the screw thread, can promote plastic material's flow, inside runner surface shaping quality is good, and the practicality is strong.
Specifically, the mounting body 1, the shoulder 2 and the pin 3 are of an integral structure. The integrated structure has the advantages of higher strength, longer service life, simple and convenient processing, low manufacturing cost and strong practicability.
Another embodiment of the present invention further provides a method for processing an internal flow channel by using a friction stir processing technique, where the welding tool 100 for processing an internal flow channel by using a friction stir processing technique provided by any of the above embodiments includes the following steps:
step one, mounting a welding tool 100 for processing an internal flow channel by using a friction stir processing technology on a rotary driving device, such as a main shaft of welding equipment, through a mounting body 1; and the workpiece to be processed is clamped and fixed.
And step two, the rotary driving device drives the welding tool 100 which utilizes the stirring friction treatment technology to process the internal flow channel to rotate around the axis of the stirring pin 3, then the stirring pin 3 is completely inserted into the workpiece to be processed, the shaft shoulder 2 is in contact with the surface of the workpiece, a set pressure exists, the stirring effect of the welding tool 100 which utilizes the stirring friction treatment technology to process the internal flow channel enables the workpiece material at the position of the stirring pin 3 to be heated and softened, the plastic material in the workpiece flows into the hollow channel 31 through the side opening 32 of the stirring pin 3 and is extruded out through the shaft shoulder through hole 21, and the upper layer material of the workpiece forms a new workpiece surface under the driving of the shaft shoulder 2 and the stirring pin 3.
The shaft shoulder 2 is ensured to be in contact with the surface of a workpiece and has set pressure in the machining process, and no plastic material is extruded from the interface between the shaft shoulder 2 and the workpiece in the stirring needle 3 area in the welding process.
As shown in fig. 6 and 7, when the probe 3 has the end surface opening 33 and the guide groove 34, the rotation direction of the probe 3 coincides with the opening direction of the guide groove 34. Since the internal pressure of the softened material is substantially uniform, the fluid pressure at the end face opening 33 and the side face opening 32 of the pin 3 are almost equal and greater due to the pressing down of the pin 3; the high temperature plastic material flows upward into the hollow passage 31 through the end opening 33 and the side opening 32 of the pin 3 during rotation of the pin 3 and is extruded from the shoulder through hole 21.
And step three, moving the welding tool 100 for processing the internal flow channel by using the friction stir processing technology relative to the workpiece in parallel to the surface of the workpiece, thereby processing the internal flow channel in the workpiece. When the stirring pin 3 moves, the upper layer material is fully driven by the shaft shoulder 2 and the part above the side opening 32 of the stirring pin 3, the groove defect can not occur, the appearance with a complete surface can be formed, and the processing of the inner tunnel is realized
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A welding tool for processing an internal flow channel by using a friction stir processing technology comprises an installation body, a shaft shoulder and a stirring pin, wherein the shaft shoulder and the stirring pin are revolution bodies, one axial end of the shaft shoulder is fixedly connected with the installation body, and the stirring pin is coaxially and fixedly connected with the other end, far away from the installation body, of the shaft shoulder; the circumference side of the shaft shoulder is provided with a shaft shoulder through hole, and the shaft shoulder through hole is communicated with the hollow channel.
2. The bonding tool for machining the internal flow passage by using the friction stir processing technology as claimed in claim 1, wherein the end surface of the stirring pin is further provided with an end surface opening, and the end surface opening is communicated with the hollow passage.
3. The welding tool for machining the internal flow passage by using the friction stir processing technology as claimed in claim 2, wherein at least two side openings are formed in the circumferential side surface of the stirring pin, and the side openings are distributed in a central symmetry manner with respect to the axis of the stirring pin;
the circumferential side surface of the stirring pin is also provided with a diversion trench along the radial tangential direction, and the diversion trench is arranged on the same side of the side surface open pore along the circumferential direction of the stirring pin and is communicated with the side surface open pore.
4. The bonding tool for machining an internal flow passage by friction stir processing of claim 2, wherein the inner diameter of the end opening is smaller than 2/3 of the diameter of the end face of the stirring pin, and the inner diameter of the hollow passage and the inner diameter of the shoulder through hole are larger than the inner diameter of the end opening.
5. The bonding tool for machining an internal flow passage using friction stir processing of claim 1, wherein the inside diameter of the side opening is less than 2/3 times the length of the pin, and the inside diameter of the hollow passage and the inside diameter of the shoulder bore are greater than the inside diameter of the side opening.
6. The bonding tool for machining an internal flow passage by friction stir processing according to claim 1, wherein an outer diameter of the end surface of the shoulder connecting the stirring pin is greater than 1.2 times an outer diameter of a root of the stirring pin.
7. A bonding tool for machining an internal flow passage by friction stir processing according to any of claims 1 to 6, wherein threads are further provided on the circumferential side surface and the shoulder of the pin between the side opening and the root of the pin.
8. A bonding tool for processing internal flow passages using friction stir processing techniques as claimed in any one of claims 1 to 6 wherein said mounting body, said shoulder and said pin are of unitary construction.
9. A method for processing an internal flow passage by friction stir processing, characterized in that the bonding tool for processing an internal flow passage by friction stir processing according to any one of claims 1 to 8 is used, comprising the steps of:
step one, mounting a welding tool on a rotary driving device through a mounting body, and clamping and fixing a workpiece to be processed;
secondly, the rotary driving device drives the welding tool to rotate around the axis of the stirring pin, then the stirring pin is completely inserted into the workpiece to be processed, the shaft shoulder is in contact with the surface of the workpiece, set pressure exists, the stirring effect of the welding tool enables the workpiece material at the stirring pin to be heated and softened, the plastic material in the workpiece flows into the hollow channel through the side opening of the stirring pin and is extruded out through the through hole of the shaft shoulder, and the upper layer material of the workpiece forms a new workpiece surface under the driving of the shaft shoulder and the stirring pin;
and thirdly, moving the welding tool relative to the workpiece in parallel to the surface of the workpiece, so as to machine an internal flow channel in the workpiece.
10. The method for processing the internal flow passage by using the friction stir processing technology as recited in claim 9, wherein an end surface opening is further formed in an end surface of the stirring pin, and the end surface opening is communicated with the hollow passage; at least two side openings are formed in the circumferential side surface of the stirring pin, and the side openings are distributed in a centrosymmetric manner with the axis of the stirring pin; the circumferential side surface of the stirring pin is also provided with a diversion trench along the radial tangential direction, and the diversion trench is arranged on the same side of the side surface opening hole along the circumferential direction of the stirring pin and is communicated with the side surface opening hole;
the rotating direction of the stirring needle is consistent with the opening direction of the diversion trench.
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