CN100453660C - On-line processing method for magnesium alloy wire and strip using high energy electric pulse - Google Patents
On-line processing method for magnesium alloy wire and strip using high energy electric pulse Download PDFInfo
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- CN100453660C CN100453660C CNB2006100619572A CN200610061957A CN100453660C CN 100453660 C CN100453660 C CN 100453660C CN B2006100619572 A CNB2006100619572 A CN B2006100619572A CN 200610061957 A CN200610061957 A CN 200610061957A CN 100453660 C CN100453660 C CN 100453660C
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Abstract
The on-line high energy electric pulse process of treating magnesium alloy wire and strip includes: conveying magnesium alloy wire and strip with one unwinding device and one winding device, introducing high energy pulse current the high energy pulse power source generates via one pair of distance adjustable electrodes to the moving magnesium alloy wire and strip in the charging area, and forced cooling the moving magnesium alloy wire and strip in the charging area via soaking in cooling medium. The present invention has lowered power consumption, high production efficiency and no surface oxidation, and is especially suitable for treatment of magnesium alloy wire of 3 mm below diameter and magnesium alloy strip of 3 mm below thickness. The treated structure has great amount one micron and sub-micron size crystal grains and greatly raised comprehensive performance.
Description
Technical field
The invention belongs to the treatment technology of Mg alloy wire, band, specifically be to adopt high energy electric pulse that Mg alloy wire, the band of work hardening are carried out the online treatment novel process, treated Mg alloy wire, band, intensity and plasticity index all are improved with respect to the conventional annealing treatment process.
Background technology
Conventional magnesium alloy is lighter by 30%～50% than aluminium alloy, lighter more than 70% than iron and steel, be applied in the engineering and can alleviate the structural part quality greatly, and magnesium alloy has high specific tenacity and specific rigidity, the dimensional stability height, the damping shock absorption performance is good, thereby magnesium alloy has excellent mechanical property, is specially adapted to light structures spare.The Mg alloy wire of high-strength and high ductility (band) material can have fabulous market application foreground as application such as welding material, fibrous reinforcement member, spectacle frame, special spring members.
Slip system is few under the magnesium alloy room temperature, and plastic deformation ability is poor, occurs twin phenomenon easily, thereby poor processability, and the yield rate of material is low, so cause tooling cost very expensive.All have certain difficulty for product processing and preparing such as wrought magnesium alloys rod, pipe, band, silks at present, so that deformed magnesium alloy material obtains the needs that excellent comprehensive mechanical property more could satisfy more structural parts.Therefore, improve magnesium alloy over-all properties, exploitation wrought magnesium alloys new process of production, become inexorable trend.
The conventional working method of wrought magnesium alloys silk material, band mainly is by cold working after the Full Annealing at present.Wrought magnesium alloys is after a series of distortion of process (as hot extrude, cold drawn, cold rolling), by 300～400 ℃, about about 30 minutes to 1 hour Full Annealing, in the cold working process, often need to carry out silk (band) section product that repetitious process annealing operation could obtain requirement.The magnesium-alloy material surface oxidation that this method obtains is serious, difficult quality guarantee, and material property is relatively low, and the temperature field spatial distribution of annealing furnace is difficult to guarantee evenly, also exist anneal uniformity poor, the unstable properties of silk (band) material, low and treatment time of thermo-efficiency such as grows at shortcoming.
Summary of the invention
Conventional treatment process above shortcomings in view of magnesium alloy silk material, band, the invention provides the high energy electric pulse treatment process of a kind of Mg alloy wire (band) material, with respect to conventional treatment process, this method all is improved Mg alloy wire (band) material on plasticity and intensity, and the saving energy, reduce production costs, avoided the surface oxidation phenomenon of Mg alloy wire (band) material in the conventional processing process.
The present invention utilizes high energy electric pulse that Mg alloy wire, band are carried out on-line processing method and may further comprise the steps:
Transmit to described wrap-up direction with certain speed by wrap-up, unwinding device drive magnesium alloy silk material or band; Dispose a high energy pulse power supply, the high energy pulse electric current that contacts electrode by a pair of adjustable distance provides this power supply imports the electric imposing region of moving Mg alloy wire or band and handles, simultaneously, the magnesium alloy silk material of described motion or band electric imposing region are soaked and force cooling in the heat-eliminating medium that is embedded in forced cooling device.Wherein, the processing parameter of the high energy pulse electric current of magnesium alloy silk material that input motion or band electric imposing region is: pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 150～2500A/mm of current density
2
The present invention adopts and is exclusively used in wire, the band electricity is moulded the high energy pulse power supply of processing, and this high energy pulse power supply comprises:
One AC/DC change-over circuit;
One electrical condenser;
One charging circuit, this charging circuit comprise and the placed in-line charging silicon controlled rectifier of electrical condenser, the positive termination AC/DC change-over circuit of charging silicon controlled positive output end;
One discharging circuit, this discharging circuit comprises discharging thyristor and a pair of contacts electrode, the discharging thyristor anode is connected with charging silicon controlled negative terminal, a contacts electrode is connected in the discharging thyristor negative terminal, another contacts electrode ground terminal imports work metal spare by this a pair of contacts electrode with the high energy pulse electric current;
And, one pilot circuit, two output terminals of this pilot circuit are connected with the control end of charging silicon controlled rectifier and discharging thyristor respectively, and pilot circuit alternately triggers the charge and discharge silicon controlled rectifier and takes turns conducting, make electrical condenser charging and discharge, thereby in discharging circuit, form the high energy pulse electric current.
In the electricimpulse treating processes, produce certain joule heating effect and other non-thermal effect in the Mg alloy wire (band), because the coupling of joule heating effect and non-thermal effect, the atomic vibration energy is further sharply increased, the acceleration of climbing of dislocation, make dislocation assemble, promote forming core, reduced the growth rate of nucleus to subgrain boundary.And, make Mg alloy wire (band) material that obtains have more tiny crystal grain because the electricimpulse treatment time is very short, promote forming core, thereby makes that recrystal grain has little time to grow up.The recrystallize forming core mainly concentrates on deformation bands and crystal boundary place, and the power of recrystallize forming core comes from material energy stored in the cold deformation process.So serious more silk (band) material of work hardening, easy more generation recrystallize forms a large amount of superfine crystal grain, and these tiny grain structures can make material that compatible deformation ability is preferably arranged when stressed, improved the intensity and the plasticity of material, made material obtain the excellent comprehensive performance.
Mg alloy wire (band) being carried out the electricimpulse processing simultaneously, Mg alloy wire (band) material electric imposing region is forced cooling by forced cooling device.Force cooling to reduce the heat effect that is produced because of the high energy pulse electric current on Mg alloy wire (band) material, guaranteed dimensional precision, the grain growth of avoiding temperature to raise and cause has improved the over-all properties of (band) material.Owing to the electricimpulse protection that lack and cool off oil film action time on silk (band) material, can avoid the high temperature oxidation phenomenon of Mg alloy wire (band) material, improve surface smoothness.
The relative traditional treatment method of the present invention can reduce production costs, increase substantially production efficiency greatly.Compare with other conventional processing technology, the silk of work hardening (band) material is keeping the high-intensity while of material after handling through this method, and plasticity is greatly improved, and the product that is obtained has the excellent comprehensive mechanical property.Be specially adapted to diameter less than the processing of the magnesium alloy silk material of 3mm and thickness less than the magnesium alloy strip of 3mm.
Its pulse power adopts suitable metal wire material, band electricity to mould the high energy pulse power supply of processing, and this high energy pulse power source circuit is reasonable in design, simple in structure, the reliability height.
Description of drawings
Fig. 1 is the high energy electric pulse online treatment device embodiment synoptic diagram of magnesium alloy silk material;
Fig. 2 a is the metallographic structure of AZ31 silk material after through bigger cold drawn distortion;
Fig. 2 b is the metallographic structure of identical cold drawn attitude AZ31 silk material after conventional anneal;
Fig. 2 c is the metallographic structure of identical cold drawn attitude AZ31 silk material after high energy electric pulse is handled;
Fig. 2 d is the metallographic structure under the digital 3 D video of HIROX is micro-after high energy electric pulse is handled of identical cold drawn attitude AZ31 silk material;
Fig. 3 is the metallographic structure of cold working attitude AZ31 band after high energy electric pulse is handled;
Fig. 4 is the schematic diagram of its high energy pulse power supply one embodiment.
Embodiment
Fig. 1 is the high energy electric pulse online treatment equipment of the magnesium alloy silk material of realization technology of the present invention.It comprises high energy electric pulse power supply 1, positive and negative contacts electrode 2,3, Mg alloy wire (band) material 4, unwinding device 5, wrap-up 6, oil-in 7, oil outlet 8 and refrigerating unit 9.High energy pulse power supply 1 makes the high energy pulse electric current import Mg alloy wire (band) material 4 of movement continuously by two contacts electrodes 2,3, and transmission speed is by frequency transformer and torque motor adjustment control.Mg alloy wire (band) material 4 by put, wrap-up 5,6 supports and tensionings, this device energy of rotation drive Mg alloy wire (band) material 4 with certain speed to shown in direction wrap-up 6 transmit continuously, the transmission speed of Mg alloy wire (band) material can be 0.2～100m/min.
Turning oil refrigerating unit 9 is set around the electric imposing region of Mg alloy wire (band) material 4 of movement continuously, and import and export oil by oil-in 7, oil outlet 8, Mg alloy wire (band) the material electric imposing region of described motion is soaked in the heat-eliminating medium that is embedded in forced cooling device force cooling process, prevent the fracture of Mg alloy wire (band) material, and guarantee surface quality.Wherein heat-eliminating medium is lubricating oil or kerosene or oil in water emulsion (liquid) or the like.
Contacts electrode is the Electical connector 2,3 that is covered the upper and lower briquetting that nickel dam (also can be copper-graphite or brass) material makes by two copper, and the pressure that passes through the adjustment briquetting keeps it well to contact with Mg alloy wire (band) material 4, to reduce the contact resistance between silk (band) material and Electical connector, the spark phenomenon that takes place when avoiding Mg alloy wire (band) material 4 by contacts electrode.Can be during processing according to the distance between required speed adjustment the two poles of the earth.Distance between the contacts electrode is adjustable, chooses between 100～400mm according to the specification of handling Mg alloy wire (band) material.
Present method is applicable to the magnesium alloy silk material of diameter of phi 0.05～5mm, and the processing of thickness 0.05～5mm magnesium alloy strip.Be specially adapted to diameter less than the processing of the magnesium alloy silk material of 3mm and thickness less than the magnesium alloy strip of 3mm.
The pulse power that the present invention adopts be exclusively used in wire, the band electricity is moulded the high energy pulse power supply of processing.As shown in Figure 4, the high energy pulse power supply comprises:
One AC/DC change-over circuit 11;
One electrical condenser C;
One charging circuit, this charging circuit comprise and the placed in-line charging silicon controlled rectifier of electrical condenser C Q1, positive termination AC/DC change-over circuit 11 positive output ends of charging silicon controlled rectifier Q1;
One discharging circuit, this discharging circuit comprises discharging thyristor Q2 and a pair of contacts electrode J1, J2, discharging thyristor anode Q2 is connected with the negative terminal of charging silicon controlled rectifier Q1, a contacts electrode J1 is connected in discharging thyristor Q2 negative terminal, another contacts electrode J2 ground terminal imports work metal spare G by this a pair of contacts electrode J1, J2 with the high energy pulse electric current; And,
One pilot circuit 12, two output terminal K1, K2 of this pilot circuit 12 are connected with the control end of charging silicon controlled rectifier Q1 and discharging thyristor Q2 respectively, pilot circuit 12 alternately triggers charging silicon controlled rectifier Q1, discharging thyristor Q2 and takes turns conducting, make electrical condenser C charging and discharge, thereby in discharging circuit, form the high energy pulse electric current.
Wherein, the charging silicon controlled rectifier Q1 of high energy pulse power supply and discharging thyristor Q2 are high-power one-way SCR.The pilot circuit 12 of high energy pulse power supply comprises adjustable pulse-generating circuit MZ and pulsed triggering circuit MC, the input terminus of the output termination pulsed triggering circuit MC of adjustable pulse-generating circuit MZ.AC/DC change-over circuit 11 comprises silicon controlled rectifier voltage setter T, transformer BY and three-phase rectifier ZL, main power circuit is powered by three-phase 380V power supply, after silicon controlled rectifier voltage setter T input transformer BY transformation, export three-phase rectifier ZL rectification again to, silicon controlled rectifier voltage setter T can be to the commutating voltage step-less adjustment.Can connect in the charging circuit reaction diode ZP1 and telefault L, reaction diode ZP2 can connect in the discharging circuit.The peak power output of high energy pulse power supply is 15KW, and output pulse width can be 10～200 μ s, and output pulse frequency is 50～3000Hz.
When adopting Fig. 1 equipment to cooperate Fig. 4 high energy pulse power supply, the processing parameter of the high energy pulse electric current of magnesium alloy silk material that input motion or band electric imposing region is: pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 150～2500A/mm of current density
2
Embodiment 1:AZ31 magnesium alloy silk material is after cold drawing, and silk material diameter is φ 1.72mm.Adopt the treatment process of equipment shown in Figure 1 and high energy electric pulse of the present invention that this magnesium alloy silk material is handled.
With reference to Fig. 1, Mg alloy wire 4 is driven by wrap-up 6 and transmits with speed 5m/min, the high energy pulse power supply covers the zone that powers up that contacts electrode 2,3 that nickel dam makes inserts the Mg alloy wire of movement continuouslys by copper handles (contact electricity pole distance 300mm), and adopts the turning oil method of cooling that the Mg alloy wire that powers up the zone is handled simultaneously.The pulse width of the high energy electric pulse of input is 60 μ s, and frequency is 480Hz, and voltage is 110V, and the current density amplitude is 600A/mm
2
Fig. 2 a is this cold drawn attitude magnesium alloy silk material metallographic structure, wherein is difficult to pick out the grain boundary, almost all is the fibrous crystal grain that extends after the cold drawn distortion.Adopt the conventional annealing mode that above-mentioned cold drawn attitude magnesium alloy silk material is handled, the metallographic structure after obtaining annealing (Fig. 2 b), as seen through routine annealing, silk material crystal grain distributes more even, but with burst process after tissue to compare grain-size bigger.Shown in Fig. 2 c, Fig. 2 d, in the magnesium alloy silk material that high energy electric pulse is handled, formed the superfine crystal particle of a large amount of micron submicron orders.These superfine crystal particles help improving the strength of materials and plasticity simultaneously, obtain the excellent comprehensive performance.As seen, on mechanical property, also there is very big-difference by the magnesium alloy silk material after the different modes processing.Table 1 shows that the performance that this AZ31 magnesium alloy silk material high energy electric pulse is handled and conventional annealing is handled compares, handling the magnesium alloy silk material that obtains through high energy electric pulse all increases on intensity and unit elongation, and surface quality is good, promptly adopts high energy electric pulse to handle and makes magnesium alloy silk material obtain the excellent comprehensive mechanical property.
The mechanical property of magnesium alloy silk material under the table 1 different treatment processing condition
Embodiment 2:AZ31 magnesium alloy strip after cold working, the wide 4mm of band, thick 0.65mm.Adopt the treatment process of high energy electric pulse of the present invention that this magnesium alloy strip is handled.
With reference to Fig. 1, magnesium alloy band 4 is driven by wrap-up 6 and transmits with speed 1m/min, the high energy pulse power supply covers the zone that powers up that contacts electrode 2,3 that nickel dam makes inserts the magnesium alloy band of movement continuouslys by copper handles (contact electricity pole distance 200mm), and adopts the turning oil method of cooling that the magnesium alloy band that powers up the zone is carried out cooling process simultaneously.The pulse width of the high energy electric pulse of input is 60 μ s, and frequency is 200Hz, and voltage is 180V, and the current density amplitude is 575A/mm
2
With reference to Fig. 3, in the magnesium alloy strip that high energy electric pulse is handled, formed the superfine crystal particle of a large amount of microns, submicron order.These superfine crystal particles help improving the strength of materials and plasticity simultaneously, obtain the excellent comprehensive performance.Table 2 shows that the performance that this AZ31 magnesium alloy strip high energy electric pulse is handled and conventional annealing is handled compares, handling the magnesium alloy strip that obtains through high energy electric pulse all increases on intensity and unit elongation, and surface quality is good, promptly adopts high energy electric pulse to handle and makes magnesium alloy strip obtain the excellent comprehensive mechanical property.
The mechanical property of magnesium alloy strip under the table 2 different treatment processing condition
Claims (9)
1, utilize high energy electric pulse that Mg alloy wire or band are carried out on-line processing method, it is characterized in that may further comprise the steps:
Transmit with certain speed by rolling, unwinding device drive Mg alloy wire or band; Dispose a high energy pulse power supply, the high energy pulse electric current that contacts electrode by a pair of adjustable distance provides this power supply imports the electric imposing region of moving Mg alloy wire or band and handles, simultaneously, the Mg alloy wire of described motion or band electric imposing region are soaked and force cooling in the heat-eliminating medium that is embedded in forced cooling device;
Wherein, described high energy pulse power supply comprises:
One AC/DC change-over circuit;
One electrical condenser;
One charging circuit, this charging circuit comprise and the placed in-line charging silicon controlled rectifier of electrical condenser, the positive termination AC/DC change-over circuit of charging silicon controlled positive output end;
One discharging circuit, this discharging circuit comprises discharging thyristor and a pair of contacts electrode, the discharging thyristor anode is connected with charging silicon controlled negative terminal, a contacts electrode is connected in the discharging thyristor negative terminal, another contacts electrode ground terminal imports described Mg alloy wire or band by this a pair of contacts electrode with the high energy pulse electric current;
And, one pilot circuit, two output terminals of this pilot circuit are connected with the control end of charging silicon controlled rectifier and discharging thyristor respectively, and pilot circuit alternately triggers the charge and discharge silicon controlled rectifier and takes turns conducting, make electrical condenser charging and discharge, thereby in discharging circuit, form the high energy pulse electric current.
2, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: wherein, the processing parameter of high energy pulse electric current that imports the electric imposing region of moving Mg alloy wire or band is: pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 150～2500A/mm of current density
2
3, the high energy electric pulse that utilizes according to claim 1 or 2 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: wherein, the charging silicon controlled rectifier and the discharging thyristor of high energy pulse power supply are high-power one-way SCR.
4, the high energy electric pulse that utilizes according to claim 1 or 2 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: wherein, the pilot circuit of high energy pulse power supply comprises adjustable pulse-generating circuit and pulsed triggering circuit, the input terminus of the output termination pulsed triggering circuit of adjustable pulse-generating circuit.
5, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: described forced cooling device adopts the oil cooling mode, and wherein heat-eliminating medium is lubricating oil or kerosene or oil in water emulsion.
6, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, and it is characterized in that: the transmission speed of described Mg alloy wire or band is 0.2～100m/min.
7, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, and it is characterized in that: the distance between the described contacts electrode is 100～400mm.
8, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: wherein, the Mg alloy wire diameter of processing is Φ 0.05～5mm.
9, the high energy electric pulse that utilizes according to claim 1 carries out on-line processing method to Mg alloy wire or band, it is characterized in that: wherein, the thickness of the magnesium alloy band of processing is 0.05～5mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101660026B (en) * | 2009-10-10 | 2011-01-05 | 孙红镱 | High specific gravity alloy material electric pulse annealing technical method |
| CN110512159B (en) * | 2019-10-08 | 2023-08-18 | 吉林大学 | Pulse current treatment device for eliminating work hardening in magnesium alloy and control method thereof |
| CN111549305B (en) * | 2020-05-18 | 2021-07-06 | 中南大学 | Strengthening and toughening method for magnesium alloy strip |
| CN111763813A (en) * | 2020-05-26 | 2020-10-13 | 东南大学 | Production method for treating high-strength high-toughness high-carbon steel wire by electric pulse |
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