CN103071917A - Ultrasonic-assisted semisolid stirring friction processing process under controlled cooling environment - Google Patents
Ultrasonic-assisted semisolid stirring friction processing process under controlled cooling environment Download PDFInfo
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- CN103071917A CN103071917A CN201310049003XA CN201310049003A CN103071917A CN 103071917 A CN103071917 A CN 103071917A CN 201310049003X A CN201310049003X A CN 201310049003XA CN 201310049003 A CN201310049003 A CN 201310049003A CN 103071917 A CN103071917 A CN 103071917A
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Abstract
The invention relates to an ultrasonic-assisted semisolid stirring friction processing process under a controlled cooling environment. The process adopts the following specific steps: a plate to be processed is placed on a horizontal worktable and fixed by a clamp; a stirrer pierces the surface of the plate; the ultrasonic waves of an ultrasonic transducer are transmitted and amplified by a non-rotary shaft shoulder, and are transmitted to the softened area of the plate, and finally, the effect of thinning crystalline grains by utilizing the acoustic cavitation effect generated in the transmission of the ultrasonic waves in the semisolid material is achieved; when a stirring tool reaches a set piercing depth, a stirring needle stops piercing and continues to rotate for 3 to 8 minutes; the traveling route of the stirring tool is determined, coolers behind the stirring tool are switched on and start to load cold source, the stirring tool then gradually moves forward to and fro from the left to the right along the longitudinal direction of the plate, wherein the two coolers are alternately switched according to the traveling direction, and are always kept behind the stirrer until the whole surface of the plate is processed.
Description
Technical field: the present invention relates to a kind of agitating friction technological method for processing, relate in particular to ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment.
Background technology: agitating friction processing (Friction stir processing, FSP) is a kind of new materials processing technology that doctor Mishra of the U.S. puts forward on the basis of friction stir welding.The stirring tool that the basic principle of this technology is comprised of the shaft shoulder and mixing needle and surface of the work friction are with the workpiece local heat, softening, intense plastic strain, dynamic recrystallization, thereby form fine and close tiny microscopic structure in stirring region, be conducive to improve the mechanical property of material.At present, FSP has obtained application at aspects such as microstructure of metals refinement, superplastic material preparation, composite surface material and nanometer phase strengthened metal base composite materials.From researcher's report, many new technologies based on FSP are suggested such as water logging FSP, multi-pass FSP, obtain undersized as far as possible microscopic structure with hope, and material is greatly improved at aspects such as mechanical property.
Summary of the invention: realize surperficial Ultra-fine Grained/nanometer in order to make the low melting point alloys such as aluminium alloy, magnesium alloy, propose ultrasonic semi-solid state assistant agitating friction technological method for processing under the control cold environment.
For achieving the above object, the technical solution used in the present invention is: ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment, specifically adopt following steps:
Agitating device comprises stirring tool and cooling device, and cooling device is looped around the adjusting that also can realize cool position all around of agitating device.Wherein stirring tool by ultrasonic transducer, do not rotate the shaft shoulder and mixing needle forms, ultrasonic transducer fits tightly with the upper surface that does not rotate the shaft shoulder, herein do not rotate the ultrasonic transformer that the shaft shoulder serves as ultrasonic transducer, ultrasonic wave amplified and be delivered to zone to be processed; Do not rotate the shaft shoulder and be sleeved on the mixing needle, wherein mixing needle is tapered and be threaded, and its diameter is larger, cone angle is little, greatly increase the contact-making surface with the mutual friction of material phase, and then improved the temperature heat of part to be processed, be convenient to the appearance of material semisolid phenomenon.
Beneficial effect of the present invention:
One, in process, machined material reaches semisolid, is a kind of Semi-solid Stirring friction processing method, and is different from conventional agitating friction processing method.For making material reach semisolid, mixing needle needs High Rotation Speed, makes larger strain and the strain rate of semi-solid material experience with less viscosity, is beneficial to grain refinement.
Two, in process, the mixing needle High Rotation Speed produces heat, does not rotate the shaft shoulder and apply ultrasonic vibration towards the material surface that the liquefaction composition occurs, the sound cavitation effect crystal grain thinning that produces when utilizing ultrasonic wave to propagate in semi-solid material;
Therefore three, in process, the shaft shoulder does not rotate, and can not produce the structures such as arc line, makes the material post processing work after the processing simple;
Four, in process, utilization follows the synchronization-moving chilling device of stirring and processing instrument closely, form shape of a saddle temperature field in the stirring tool back, can significantly shorten growing up the time of the rear material grains of processing, make the surperficial Ultra-fine Grained/nano-crystallization of the low melting materials such as aluminium alloy, magnesium alloy become possibility.Simultaneously, the thermal deformation that is caused by processing heat can be reduced in the shape of a saddle temperature field that has the thermal tension effect.
Description of drawings:
Fig. 1 is the structural representation of agitating device.
Fig. 2 is technical process schematic diagram of the present invention.
Fig. 3 is the position relationship schematic diagram of agitating friction process stirring tool and sheet material.
1. ultrasonic transducers among the figure 2. do not rotate the shaft shoulder, 3. mixing needle, 4. cooling device, 5. stirring tool, 6. sheet material.
The specific embodiment:
As shown in Figure 1-Figure 3, ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment, specifically adopt following steps:
Agitating device comprises stirring tool 5 and cooling device 4, and cooling device 4 is looped around the adjusting that also can realize cool position all around of agitating device 5.Wherein stirring tool 5 by ultrasonic transducer 1, do not rotate the shaft shoulder 2 and mixing needle 3 forms, ultrasonic transducer 1 fits tightly with the upper surface that does not rotate the shaft shoulder 2, herein do not rotate the ultrasonic transformer that the shaft shoulder 2 serves as ultrasonic transducer 1, ultrasonic wave amplified and be delivered to part to be processed; Do not rotate the shaft shoulder 2 and be sleeved on the mixing needle 3, wherein mixing needle 3 is tapered and be threaded, and its diameter is larger, cone angle is little, greatly increase the contact-making surface with the mutual friction of material phase, and then improved the temperature heat of part to be processed, be convenient to the appearance of material semisolid phenomenon.
Embodiment 2: present embodiment is in step 2, and the rotary speed of described mixing needle is 7000 rev/mins.Can select according to the concrete condition of temperature in the sheet material process to be processed the rotary speed of mixing needle, make material reach semisolid.Other step is identical with embodiment one.
Embodiment 3: present embodiment is in step 3, and described stirring tool 5 moves along horizontal direction with the speed that 50mm/ divides.Can select according to the concrete condition of the temperature in the sheet material process to be processed the translational speed of stirring tool, make material reach semisolid.Other step is identical with embodiment one.
Embodiment 4: present embodiment is in step 3, and is described when stirring tool 5 reaches the lower bundle degree of depth of setting, and mixing needle 1 stops lower bundle and continues rotation 6 minutes.Can select according to the concrete condition of the temperature in the sheet material process to be processed the continuation rotational time of mixing needle, make sheet material obtain sufficient preheating, make the easier semisolid that reaches of material.Other step is identical with embodiment 3.
Embodiment 5: present embodiment is in step 4, and described cooling medium is water, and coolant-temperature gage is 25 ℃.Can select according to the grain refinement in the sheet material process to be processed and residual deformation control degree the temperature of cooling water.Other step is identical with embodiment 4.
Embodiment 6: present embodiment is in step 4, and described cooling medium is argon gas, and gas temperature is-50 ℃.Can select according to the grain refinement in the sheet material process to be processed and residual deformation control degree the temperature of refrigerating gas.Other step is identical with embodiment 4.
Claims (5)
1. control ultrasonic semi-solid state assistant agitating friction technological method for processing under the cold environment for one kind, specifically adopt following steps:
Step 1, sheet material to be processed is placed on the workbench of level and with the anchor clamps clamping and fixes;
Step 2, agitating device penetrate plate surface with 500～7000 rev/mins rotating speed, and the speed of penetrating is that 2～8mm/ divides, and the shaft shoulder does not rotate and needs to keep fitting tightly with surface, workpiece top; The ultrasonic wave of ultrasonic transducer amplifies by not rotating shaft shoulder transmission, and ultrasonic wave is delivered to the softened zone of sheet material, finally reaches the effect of the sound cavitation effect crystal grain thinning of generation when utilizing ultrasonic wave to propagate in semi-solid material;
Step 3, when stirring tool reaches the lower bundle degree of depth of setting, mixing needle stops lower bundle and continues rotation 3～8 minutes, carries out material preheater;
Step 4, determine the course of stirring tool, open the cooling device that is positioned at the stirring tool back and begin to load low-temperature receiver, then the stirring tool speed of dividing with 50～1500mm/ comes and goes from left to right echelon along the sheet material longitudinal direction and travels forward, wherein two cooling devices alternately switch according to direct of travel, constantly guarantee that cooling device is positioned at the agitating device rear, until whole plate surface completion of processing.
2. ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment as claimed in claim 1, it is characterized in that: described agitating device comprises stirring tool and cooling device, cooling device be looped around agitating device around; Wherein cooling medium can adopt water-cooled or air cooling, the temperature of cooling water between 0～200 ℃ or refrigerating gas below 0 ℃.
3. ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment as claimed in claim 2, it is characterized in that: described stirring tool by ultrasonic transducer, do not rotate the shaft shoulder and mixing needle forms, ultrasonic transducer fits tightly with the upper surface that does not rotate the shaft shoulder, does not rotate the shaft shoulder and is sleeved on the mixing needle.
4. such as ultrasonic semi-solid state assistant agitating friction technological method for processing under claim 1 or the 3 described a kind of control cold environments, it is characterized in that: described mixing needle is tapered and be threaded, maximum gauge is greater than 1.5 times of sheet metal thicknesses to be processed, cone angle is less than 5 °, and length is at least less than sheet material 0.3mm to be processed.
5. ultrasonic semi-solid state assistant agitating friction technological method for processing under a kind of control cold environment as claimed in claim 2, it is characterized in that: hyperacoustic parameter of described ultrasonic transducer generating is as follows: frequency is that 20～60K and amplitude are 20～50 μ m.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104726726A (en) * | 2015-03-28 | 2015-06-24 | 冯睿 | Preparation method of alloy semisolid slurry |
| CN105209212A (en) * | 2013-03-12 | 2015-12-30 | 洛克希德马丁公司 | Friction surface stir process |
| CN106624344A (en) * | 2017-01-23 | 2017-05-10 | 沈阳航空航天大学 | Stirring friction spot welder and stirring friction spot welding method |
| CN106624343A (en) * | 2017-01-23 | 2017-05-10 | 沈阳航空航天大学 | Stirring friction welding tool and method for repairing keyhole defect through stirring friction welding tool |
| CN107119243A (en) * | 2017-05-19 | 2017-09-01 | 沈阳航空航天大学 | The method that inner structural wall nanosizing is realized based on ultrasonic wave added mixing yoghurt |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN106271025B (en) * | 2016-08-25 | 2018-03-27 | 沈阳航空航天大学 | It is a kind of to combine back side heating and the Friction stir welding method of positive Quench |
| CN110653507A (en) * | 2019-09-26 | 2020-01-07 | 沈阳航空航天大学 | Semi-solid processing method for preparing ultra-fine grain/nano-grain plate |
| CN115852223A (en) * | 2022-11-30 | 2023-03-28 | 西北有色金属研究院 | Preparation method of low-cost large-size ultrafine-grained biomedical magnesium-based composite material |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105209212A (en) * | 2013-03-12 | 2015-12-30 | 洛克希德马丁公司 | Friction surface stir process |
| CN104726726A (en) * | 2015-03-28 | 2015-06-24 | 冯睿 | Preparation method of alloy semisolid slurry |
| CN106271025B (en) * | 2016-08-25 | 2018-03-27 | 沈阳航空航天大学 | It is a kind of to combine back side heating and the Friction stir welding method of positive Quench |
| CN106624343A (en) * | 2017-01-23 | 2017-05-10 | 沈阳航空航天大学 | Stirring friction welding tool and method for repairing keyhole defect through stirring friction welding tool |
| CN106624344A (en) * | 2017-01-23 | 2017-05-10 | 沈阳航空航天大学 | Stirring friction spot welder and stirring friction spot welding method |
| CN106624344B (en) * | 2017-01-23 | 2018-11-23 | 沈阳航空航天大学 | A kind of friction stir spot welding machine and friction stir spot welding method |
| CN107119243A (en) * | 2017-05-19 | 2017-09-01 | 沈阳航空航天大学 | The method that inner structural wall nanosizing is realized based on ultrasonic wave added mixing yoghurt |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN107557626B (en) * | 2017-10-09 | 2019-02-01 | 燕山大学 | A method of preparing anisotropy aluminum alloy plate materials |
| CN110653507A (en) * | 2019-09-26 | 2020-01-07 | 沈阳航空航天大学 | Semi-solid processing method for preparing ultra-fine grain/nano-grain plate |
| CN110653507B (en) * | 2019-09-26 | 2021-07-20 | 沈阳航空航天大学 | Semi-solid processing method for preparing ultra-fine grain/nano-grain plate |
| CN115852223A (en) * | 2022-11-30 | 2023-03-28 | 西北有色金属研究院 | Preparation method of low-cost large-size ultrafine-grained biomedical magnesium-based composite material |
| CN115852223B (en) * | 2022-11-30 | 2024-01-26 | 西北有色金属研究院 | Preparation method of low-cost large-size ultrafine-grain biomedical magnesium-based composite material |
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Application publication date: 20130501 |