CN116213916A - In-situ powder-added friction stir processing tool and processing method - Google Patents
In-situ powder-added friction stir processing tool and processing method Download PDFInfo
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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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides an in-situ powder adding type stirring friction processing tool and a processing method, which solve the technical problems of unstable powder distribution position, limited powder adding amount, poor surface forming quality of a processing area, reduced thickness, high cost and complex process in the traditional preset powder type stirring friction processing process. Meanwhile, the invention provides an in-situ powder-added friction stir processing method. The invention can be widely applied to the technical field of friction stir processing.
Description
Technical Field
The invention belongs to the technical field of friction stir processing, and particularly relates to an in-situ powder type friction stir processing tool and a processing method.
Background
With the development of industry and the progress of technology, the preparation of high-performance materials with low cost and high efficiency is a necessary trend of development. The surface modification technology can be used for preparing a high-performance alloy layer on the surface layer of a low-cost material by changing the surface layer structure of the material, so that the surface layer material can exert the mechanical properties of the matrix material and obtain various special properties such as good wear resistance, corrosion resistance, fatigue resistance, heat resistance, oxidation resistance and the like, thereby replacing a high-cost metal material, greatly reducing the cost, and having wide application prospects in the fields of aerospace, rail transit, weapons and the like. The existing surface modification technology comprises laser surface modification, electron beam surface modification, ion beam surface modification and the like, and all the surface modification technology relates to melting and resolidifying of surface layer materials, has larger heat input and thinner thickness of a modified layer, and has certain limitation.
Friction stir processing (Friction stir processing, FSP for short) is an efficient, low cost surface finishing modification technology taught by mishara, university of missur in the united states, based on the principle of friction stir welding (Friction stir welding, FSW for short) in 1999. As a solid phase processing technology, a friction stir processing tool rotating at a high speed is pressed into a workpiece, and a surface layer tissue is dynamically recrystallized and refined under the strong thermal coupling effect, so that the toughness and corrosion resistance of a surface layer material are improved. The method has the advantages that alloy element powder is synchronously added into a workpiece in the stirring friction processing process, the alloy element powder and a matrix are metallurgically bonded under the action of friction heat, and further special performance is endowed to the surface layer material. At present, the traditional preset powder type friction stir processing technology is applied to the technical problems of unstable powder distribution position, limited powder addition amount, poor surface forming quality of a processing area and the like frequently, and meanwhile, the thickness of the processing area is reduced due to the fact that a shaft shoulder is pressed into a workpiece, so that the whole mechanical property of the workpiece is affected, and the traditional preset powder type friction stir processing technology has certain limitation.
Patent CN105057683a discloses a method for improving uniformity of a composite material prepared by friction stir processing by adding rare earth oxide, which adopts a traditional friction stir processing tool, and by prefabricating blind holes on the surface of a workpiece to add alloy element powder, the blind holes are welded under the mechanical stirring action of the processing tool, and meanwhile, metallurgical bonding of the alloy element powder and a matrix is realized, but the method cannot realize uniform distribution of the alloy element powder on the surface layer of the workpiece, so that an agglomeration phenomenon of the alloy element powder is easy to occur, the addition amount of the alloy element powder is limited by the size of the blind holes, the addition amount of the alloy element powder is smaller if the size is too small, the blind holes cannot be welded in the processing process if the size is too large, and the surface quality after processing is affected.
Patent CN110052698A discloses a preset wire type friction stir processing method, which adopts a traditional friction stir processing tool, and places a wire wrapped with alloy element powder in a form of prefabricating a groove on the surface of a workpiece, but the modification effect of the method is still limited by the size of the groove, tunnel defects caused by insufficient metal mixing are easily generated in a processing area, and the problem of thickness reduction of the processing area is inevitably generated, so that the process is complex, the flow is complex, and large-scale engineering application cannot be realized.
Patent US2017043429 (A1) discloses a friction stir tool with a continuous feeding system, which realizes that alloy element powder is conveyed into a plate to be welded and an alloy element layer is clad on the surface of the plate in a coaxial powder conveying manner, so that friction stir additive manufacturing of a high-performance material can be realized, but when the method is applied to friction stir processing modification, accurate addition of the alloy element powder to the surface of the plate cannot be realized, and the method has the defects of large quantity of the alloy element powder, high cost, complex process and certain limitation when the method is used for additive manufacturing of the high-performance material.
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides an in-situ powder-added stirring friction processing tool and a processing method, wherein the in-situ powder-added stirring friction processing tool is utilized to control added alloy element powder in the stirring friction processing process, so that the alloy element powder is accurately and uniformly distributed on the surface layer of a processing area, the surface forming quality is ensured, the thinning-free processing treatment is realized, the process flow is further simplified, the efficiency is improved, the cost is saved, and the application breadth and depth of the stirring friction processing technology are greatly improved.
The invention provides an in-situ powder adding type stirring friction processing tool which is provided with an outer shaft shoulder and an inner shaft shoulder which is connected with the center of the outer shaft shoulder in a matched mode, wherein a screw powder feeding device is sleeved on the inner shaft shoulder, a first vortex groove is formed in the lower end face of the inner shaft shoulder, an inner concave lower end face is formed in the outer shaft shoulder, a second vortex groove is formed in the inner concave lower end face, and the lower end face of the inner shaft shoulder protrudes out of the inner concave lower end face of the outer shaft shoulder.
Preferably, the lower end surface of the inner shoulder protrudes a distance of 0.3-1.0mm compared to the inner concave lower end surface of the outer shoulder.
Preferably, the center of the lower end face of the inner shaft shoulder is provided with powder feeding holes, and the first vortex grooves and the second vortex grooves are distributed in a circumferential array by taking the powder feeding holes as the center.
Preferably, the depth of the first vortex groove and the second vortex groove is 0.5-0.9mm, and the width of the first vortex groove and the second vortex groove is 0.3-2.0mm.
Preferably, the concave angle of the concave end face of the outer shoulder is 5-15 °.
Preferably, the material of the in-situ added powder type friction stir processing tool is one of tool steel, hard alloy and tungsten-rhenium alloy, the hardness of the selected material is not lower than that of the metal workpiece and the added alloy element powder, and the melting point of the selected material is not lower than that of the metal workpiece and the added alloy element powder.
Meanwhile, the invention provides an in-situ powder adding type friction stir processing method, which utilizes the in-situ powder adding type friction stir processing tool and comprises the following specific steps:
driving an in-situ powder-added friction stir processing tool to rotate by using a friction stir processing machine to press into a metal plate, pressing an inner shoulder into a metal workpiece, attaching the outer edge of an outer shoulder to the surface of the metal workpiece, and enabling the metal of the workpiece to reach a thermoplastic state; meanwhile, the screw powder feeding device presses alloy element powder through powder feeding Kong Yunsu of the inner shaft shoulder, thermoplastic metal materials extruded by the inner shaft shoulder and the alloy element powder overflow to the concave lower end face of the outer shaft shoulder, the surface of a metal workpiece and the side wall of the inner shaft shoulder to form a concave cavity, flow along the first vortex line groove and the second vortex line groove, and are reshaped under the upsetting action of the outer shaft shoulder, so that the thinning-free workpiece is obtained.
Preferably, the alloy element powder is one or more of nickel, zinc, copper, aluminum oxide, silicon carbide and rare earth elements, and the particle size d90 of the alloy element powder is smaller than 40 mu m.
Preferably, the rotational speed of the in-situ added powder type friction stir processing tool is 300-1000rpm, and the moving speed of the in-situ added powder type friction stir processing tool is 50-500mm/min.
Preferably, the metal workpiece is mechanically polished and surface treated with a chemical agent prior to machining.
Preferably, the chemical reagent is acetone or absolute ethanol.
The beneficial effects of the invention are as follows:
(1) The in-situ added powder type friction stir processing tool is provided with the outer shaft shoulder and the inner shaft shoulder, and the inner shaft shoulder and the outer shaft shoulder rotate at high speed, so that the surface metal of the metal workpiece is subjected to severe plastic deformation, crystal grains are obviously refined, and the mechanical property of the surface metal of the metal workpiece can be effectively improved. The screw powder feeding device is sleeved on the inner shaft shoulder, the screw powder feeding device is matched with the high-speed rotation of the inner shaft shoulder and the outer shaft shoulder, alloy element powder is metallurgically bonded with base metal under the action of processing heat, and the special performances such as excellent wear resistance, corrosion resistance, fatigue resistance, heat resistance, oxidation resistance and the like are further endowed to the surface metal of the metal workpiece, so that the cost is low, the process is simple, and the modification effect is good. In addition, the lower end surfaces of the inner shaft shoulder and the outer shaft shoulder are respectively provided with a vortex groove, so that heat input and flow of metal materials in the processing process can be increased, and even distribution of added alloy element powder on the surface of a metal workpiece and metallurgical combination of the added alloy element powder and matrix metal are further promoted.
(2) According to the in-situ powder adding type friction stir processing method, the lower end face of the inner shaft shoulder protrudes out of the inner concave lower end face of the outer shaft shoulder, the inner shaft shoulder is pressed into the metal workpiece to stir and extrude metal materials, thermoplastic metal and alloy element powder are extruded by the inner shaft shoulder to overflow, the overflow thermoplastic metal and alloy element powder is temporarily stored in the inner concave lower end face of the outer shaft shoulder, the surface of the metal workpiece and the side wall of the inner shaft shoulder to form an inner concave cavity, and is reshaped under the upsetting action of the outer shaft shoulder, so that the alloy element powder is accurately added to the surface layer of the metal workpiece, the powder consumption is saved, the surface modification effect is improved, the overflow loss of the thermoplastic metal is eliminated, and a non-thinning processing area is obtained. In addition, the processing modification treatment of the metal workpieces with different thickness surface layers is realized by adjusting the protruding distance of the lower end surface of the inner shaft shoulder compared with the inner concave lower end surface of the outer shaft shoulder, and the processing modification treatment method has the advantages of high implementation degree, strong self-adaptability, simple process flow and high efficiency, is suitable for large-scale engineering application, and improves the application breadth and depth of the friction stir processing technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of an in-situ addition powder friction stir processing tool of the present invention;
FIG. 2 is a schematic illustration of an in-situ addition powder friction stir processing process according to the present invention;
FIG. 3 is a schematic diagram showing the change of the surface layer material structure and the flow of alloy element powder of the metal workpiece in the invention;
the symbols in the drawings illustrate:
1. a metal workpiece; 2. adding a powder type friction stir processing tool in situ; 21. an inner shoulder; 22. an outer shoulder; 23. a first vortex groove; 24. a concave cavity; 25. a second vortex groove; 26. a powder feeding hole; 3. a screw powder feeding device; 4. alloy element powder.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Example 1
An in-situ additive powder type friction stir processing tool 2 is prepared from one of tool steel, hard alloy and tungsten-rhenium alloy, wherein the hardness of the selected material is not lower than that of a metal workpiece and added alloy element powder, and the melting point of the selected material is not lower than that of the metal workpiece and added alloy element powder.
As shown in fig. 1, an in-situ powder-added friction stir processing tool 2 is provided with an outer shaft shoulder 22 and an inner shaft shoulder 21 which is in matched connection with the center of the outer shaft shoulder 22, wherein a screw powder feeding device 3 is sleeved on the inner shaft shoulder 21, and is used for in-situ adding of alloy element powder 4 in the processing process, and the alloy element powder 4 is metallurgically bonded with a base metal under the action of processing heat, so that the metal on the surface layer of a metal workpiece 1 is endowed with excellent special performances such as wear resistance, corrosion resistance, fatigue resistance, heat resistance, oxidation resistance and the like, and the in-situ powder-added friction stir processing tool is low in cost, simple in process and good in modification effect. The lower end face of the inner shaft shoulder 21 is provided with a first vortex groove 23, the outer shaft shoulder 22 is provided with an inner concave end face, and the inner concave end face is provided with a second vortex groove 25, so that the structural design can increase heat input and flow of metal materials in the processing process, and further promote uniform distribution of added alloy element powder 4 on the surface of the metal workpiece 1 and metallurgical combination of the added alloy element powder and matrix metal. Meanwhile, the lower end face of the inner shaft shoulder 21 protrudes from the inner concave end face of the outer shaft shoulder 22, and the processing modification treatment of the metal workpiece 1 with different thickness surface layers is further realized by adjusting the protruding distance of the lower end face of the inner shaft shoulder 21 compared with the inner concave end face of the outer shaft shoulder 22.
Further, a powder feeding hole 26 is formed in the center of the lower end face of the inner shaft shoulder 21, added alloy element powder is pressed into the metal workpiece 1 through the powder feeding hole by a screw powder feeding device, and the first vortex grooves 23 and the second vortex grooves 25 are distributed in a circumferential array with the powder feeding hole 26 as the center. The first vortex groove 23 and the second vortex groove 25 have the same depth and width, the depth is 0.5-0.9mm, and the width is 0.3-2.0mm.
Further, the concave angle of the concave end surface of the outer shoulder 22 is 5-15 °. The lower end surface of the inner shoulder 21 is protruded by a distance of 0.3-1.0mm compared with the inner concave end surface of the outer shoulder 22.
Example 2
The in-situ powder type friction stir processing method comprises the following specific steps:
in this embodiment, as shown in fig. 2-3, the direction of the arrow in fig. 3 is the powder flow direction. The lower end surface of the inner shoulder 21 protrudes 0.6mm compared to the 3-concave lower end surface of the outer shoulder. The first and second scroll grooves 23 and 25 each have a depth of 0.7mm and a width of 1.2mm; the concave angle of the concave end face of the outer shoulder 22 is 10 °.
(1) A metal work 1 is prepared, and the metal work 1 is an alloy material such as aluminum, magnesium, copper, titanium, steel, and the like. The oxide film on the surface of the metal workpiece 1 is removed by mechanical polishing, and then the surface of the workpiece 1 is wiped by using chemical reagents such as acetone or absolute ethyl alcohol to remove impurities such as greasy dirt.
(2) The metal workpiece 1 is fixed on a horizontal workbench by using a proper fixture, and the in-situ added powder type friction stir processing tool 2 is assembled on a main shaft of a friction stir processing machine. And positioning the in-situ powder-added friction stir processing tool 2 to the position right above the area to be processed of the metal workpiece 1, and starting the screw powder feeding device 3 to uniformly press in the alloy element powder 4. Specifically, the alloy element powder 4 is one or more of nickel, zinc, copper, aluminum oxide, silicon carbide and rare earth elements, and the particle diameter d90 of the powder is smaller than 40 mu m.
(3) The rotation speed of the in-situ powder-added friction stir processing tool 2 is set to be 650rpm, the movement speed of the in-situ powder-added friction stir processing tool 2 is 275mm/min, the in-situ powder-added friction stir processing tool 2 rotating at high speed interacts with the surface metal of the metal workpiece 1, the surface metal generates severe plastic deformation, crystal grains are obviously thinned, and the mechanical property of the surface metal can be effectively improved. Starting the friction stir processing machine, and driving the in-situ powder type friction stir processing tool 2 to be pressed from the position right above the metal workpiece 1 so that the metal material reaches a thermoplastic state. Specifically, an inner shaft shoulder 21 of the in-situ powder-added friction stir processing tool 2 is pressed into the metal workpiece 1, and the edge of an outer shaft shoulder 22 is contacted with the surface of the metal workpiece 1; meanwhile, the screw powder feeding device 3 presses alloy element powder at a uniform speed through a powder feeding hole 26 of the inner shaft shoulder 21, thermoplastic metal materials and alloy element powder extruded by the inner shaft shoulder 21 overflow to the concave lower end surface of the outer shaft shoulder 22, the surface of the metal workpiece 1 and the side wall of the inner shaft shoulder 21 to form a concave cavity 24, and flow along the first vortex groove 23 and the second vortex groove 25, so that the even distribution of the alloy element powder 4 on the surface layer of the metal workpiece 1 and the metallurgical combination of the alloy element powder and matrix metal are promoted; and reshaped by upsetting the outer shoulder 22; and continuously driving the in-situ powder adding type friction stir processing tool 2 to move along a preset track until the processing is finished, closing the friction stir processing machine and the screw powder feeding device 3, placing the metal workpiece 1, cooling to room temperature, and finally obtaining the workpiece which has excellent surface quality, uniform distribution of alloy element powder on the surface layer and no thickness reduction.
Example 3
Unlike embodiment 2, in this embodiment, the lower end surface of the inner shoulder 21 protrudes 0.3mm from the concave lower end surface of the outer shoulder 22. The first and second scroll grooves 23 and 25 each have a depth of 0.5mm and a width of 0.3mm; the concave angle of the concave end face of the outer shoulder 22 is 5 deg..
The rotational speed of the in-situ addition powder type friction stir processing tool 2 was set to 1000rpm, and the moving speed of the in-situ addition powder type friction stir processing tool 2 was set to 500mm/min. And after the processing is finished, finally obtaining the workpiece with excellent surface quality, uniform distribution of alloy element powder on the surface layer and no thickness reduction.
Example 4
Unlike embodiment 2, in this embodiment, the lower end surface of the inner shoulder 21 protrudes by 1.0mm compared to the concave lower end surface of the outer shoulder 22. The first and second scroll grooves 23 and 25 each have a depth of 0.9mm and a width of 2.0mm; the concave angle of the concave end face of the outer shoulder 22 is 15 deg..
The rotational speed of the in-situ addition powder type friction stir processing tool 2 was set to 300rpm, and the moving speed of the in-situ addition powder type friction stir processing tool 2 was set to 50mm/min. And after the processing is finished, finally obtaining the workpiece with excellent surface quality, uniform distribution of alloy element powder on the surface layer and no thickness reduction.
The in-situ powder-added friction stir processing tool is provided with the outer shaft shoulder 22 and the inner shaft shoulder 21, and the inner shaft shoulder 21 and the outer shaft shoulder 22 rotate at a high speed, so that the surface metal of the metal workpiece 1 is subjected to severe plastic deformation, crystal grains are obviously thinned, and the mechanical property of the surface metal of the metal workpiece 1 can be effectively improved. The screw powder feeding device 3 is sleeved on the inner shaft shoulder 21, the screw powder feeding device 3 is matched with the high-speed rotation of the inner shaft shoulder 21 and the outer shaft shoulder 22, the alloy element powder 4 and the matrix metal are in metallurgical bonding under the heating effect, and further the special performances of excellent wear resistance, corrosion resistance, fatigue resistance, heat resistance, oxidation resistance and the like of the surface metal of the metal workpiece 1 are endowed, and the process is low in cost, simple and good in modification effect. In addition, the lower end surfaces of the inner shaft shoulder 21 and the outer shaft shoulder 22 are respectively provided with a vortex groove, so that heat input and metal material flow in the processing process can be increased, and even distribution of added alloy element powder 4 on the surface of the metal workpiece 1 and metallurgical combination of the added alloy element powder and matrix metal are further promoted.
In the in-situ powder-added friction stir processing method, the lower end face of the inner shaft shoulder 21 protrudes out of the inner concave end face of the outer shaft shoulder 22, the inner shaft shoulder 21 is pressed into the metal workpiece 1 to stir and extrude metal materials, thermoplastic metal and alloy element powder are extruded by the inner shaft shoulder 21 to overflow, the overflow thermoplastic metal and alloy element powder is temporarily stored in the inner concave end face of the outer shaft shoulder 22, the surface of the metal workpiece 1 and the side wall of the inner shaft shoulder 21 to form an inner concave cavity 24, and the inner shaft shoulder is reshaped under the upsetting action of the outer shaft shoulder 22, so that the overflow loss of the thermoplastic metal is eliminated, the alloy element powder is accurately added to the surface layer of the metal workpiece 1, the powder consumption is saved, the surface modification effect is improved, and a non-thinning processing area is obtained. In addition, the lower end of the inner shaft shoulder 21 is adjusted to be more than the protruding distance of the concave lower end face of the outer shaft shoulder 22, so that the processing modification treatment of the metal workpiece 1 with different thickness surface layers is realized, and the method has the advantages of being high in implementation degree, strong in self-adaptability, simple in process flow and high in efficiency, is suitable for large-scale engineering application, and improves the application breadth and depth of the friction stir processing technology.
In summary, the invention provides a novel in-situ addition powder type friction stir processing method, which utilizes an in-situ addition powder type friction stir processing tool 2 to control added alloy element powder 4 in the friction stir processing process, ensures surface forming quality while being accurately and uniformly distributed on the surface layer of a processing area, realizes non-thinning processing treatment, further simplifies the process flow, improves the efficiency and saves the cost, and greatly improves the application breadth and depth of the friction stir processing technology.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. The in-situ powder adding type friction stir processing tool is provided with an outer shaft shoulder and an inner shaft shoulder matched and connected with the center of the outer shaft shoulder, and is characterized in that the inner shaft shoulder is sleeved with a screw powder feeding device, the lower end face of the inner shaft shoulder is provided with a first vortex groove, the outer shaft shoulder is provided with an inner concave lower end face, the inner concave lower end face is provided with a second vortex groove, and the lower end face of the inner shaft shoulder protrudes out of the inner concave lower end face of the outer shaft shoulder.
2. The in-situ added powder friction stir processing tool of claim 1 wherein a lower end surface of the inner shoulder projects a distance of 0.3-1.0mm as compared to an inner concave end surface of the outer shoulder.
3. The in-situ added powder type stirring friction processing tool according to claim 2, wherein the center of the lower end face of the inner shaft shoulder is provided with powder feeding holes, and the first vortex grooves and the second vortex grooves are arranged in a circumferential array with the powder feeding holes as the center.
4. The in-situ added powder friction stir processing tool of claim 3 wherein the first and second scroll grooves each have a depth of 0.5-0.9mm and a width of 0.3-2.0mm.
5. The in-situ added powder friction stir processing tool of claim 1 wherein the concave angle of the concave lower end surface of the outer shoulder is 5-15 °.
6. An in-situ powder-added friction stir processing method, characterized by using the in-situ powder-added friction stir processing tool according to any one of claims 1 to 5, comprising the steps of:
driving the in-situ powder adding type friction stir processing tool to rotate and press into the metal plate by using a friction stir processing machine, pressing the inner shoulder into the metal workpiece, attaching the outer edge of the outer shoulder to the surface of the metal workpiece, and enabling the metal of the workpiece to reach a thermoplastic state; meanwhile, the screw powder feeding device presses alloy element powder into the inner shaft shoulder through the powder feeding Kong Yunsu of the inner shaft shoulder, thermoplastic metal materials and alloy element powder extruded by the inner shaft shoulder overflow into an inner concave cavity formed by the inner concave end face of the outer shaft shoulder, the surface of a metal workpiece and the side wall of the inner shaft shoulder, flow along the first vortex line groove and the second vortex line groove, and are reshaped under the upsetting action of the outer shaft shoulder, so that the non-thinning workpiece is obtained.
7. The in-situ addition powder friction stir processing method of claim 6 wherein said alloy element powder is one or more of nickel, zinc, copper, aluminum oxide, silicon carbide, rare earth elements, and said alloy element powder has a particle size d90 of less than 40 μm.
8. The in-situ added powder friction stir processing method of claim 6 wherein a rotational speed of the in-situ added powder friction stir processing tool is 300-1000rpm and a moving speed of the in-situ added powder friction stir processing tool is 50-500mm/min.
9. The in-situ added powder friction stir processing method of claim 6 wherein prior to processing, mechanical grinding of the metal workpiece and surface treatment of the metal workpiece with a chemical agent is required.
10. The in-situ addition powder friction stir processing method of claim 9 wherein said chemical agent is acetone or absolute ethanol.
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