CN102172620A - Method and system for rolling difficult-to-machine metal material by combining electro-plasticity with temperature plasticity - Google Patents
Method and system for rolling difficult-to-machine metal material by combining electro-plasticity with temperature plasticity Download PDFInfo
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Abstract
The invention relates to a method for rolling a difficult-to-machine metal material by combining electro-plasticity with temperature plasticity. The method comprises the following steps of: preheating a roller to the recovery temperature of a machined metal material and lower than the recrystallization temperature of the metal material; and inputting high-energy pulse current into a machining section of the moving metal material, performing electro-plastic treatment under the actions of the thermal effect and non-thermal effect of the metal material, and feeding the machining section into the preheated roller for rolling by combining electro-plasticity with temperature plasticity. In the rolling process, electro-plasticity and temperature plasticity are combined and unbalanced kinetic energy produced by the material due to the rise of atomic potential energy and strong electric stimulation of pulse current under heating condition is fully utilized, so that movement of crystal defects such as diffusion, dislocation and the like of atoms is facilitated, the internal microstructure of the metal material is improved, a tissue which is beneficial to enhancing of intensity and toughness (plasticity) is formed, and the plasticity of the material at low temperature is enhanced. The method is suitable for rolling difficult-to-machine metal materials such as magnesium alloys, nickel-titanium alloys, tungsten alloys and the like.
Description
Technical field
The present invention relates to the rolling technique of metal material, specifically be the method and system that a kind of Electroplastic and warm plasticity combine rolling all kinds of difficult processing metals, this method makes difficult processing metal also possess good working plasticity under lower temperature rolling the combination with warm-rolling of Electroplastic, realizes lower temperature processing.
Background technology
Warm-rolling claims " middle temperature rolling " again, is a kind of deformation temperature to be controlled at a kind of milling method below the metal recrystallization temperature, more than the recovery temperature, and it has hot rolling and some cold rolling advantages concurrently.Compare with cold rolling, because the work hardening of material obtains certain answer during warm-rolling, YIELD STRENGTH is low, plasticity improves, and does not have to occur in the course of hot rolling shortcoming such as surface oxidation again, is therefore paid close attention to widely.Warm-rolling generally carries out on cold-rolling equipment, and the percentage elongation of material is about cold rolling 2-3 doubly under the warm-rolling state.Before entering the rolling deformation district, workpiece or roll are heated to uniform temperature, are rolled then with induction heater.The metal low for some plasticity, that intensity is high can obtain fine finishining by warm-rolling through after the hot rolling.Warm-rolling is fit to that plasticity is low under the processing normal temperature, yield strength is high, resistance of deformation is big etc. and is not suitable for cold rolling metal, the metal that perhaps cold rolling production efficiency is low, rolling process is many.But can not change the microscopic structure of material internal in the warm-rolling process, the diffusion of its atom also is limited, thereby warm-rolling improves the plasticity of metal or limited, and every time deflection of warm-rolling is also smaller, and warm-rolling can't substitute hot rolling.
Difficult-to-machine metals such as tungsten, molybdenum need just can roll the finished product desired thickness through hot rolling, warm-rolling, cold rolling process at present.Tungsten and tungsten alloy pass through 1200-600 ℃ warm-rolling again after 1550-1400 ℃ of hot rolling, rolling temperature reduces with the attenuate of rolled piece thickness.Warm-rolling needs 3 rolling processes altogether, and 6 rolling passes will be arranged in each rolling process, all needs to enter heat-treatment furnace after each rolling process and carries out the soft annealing processing, finally slab could be rolled 0.5mm from 8mm.The rolling process of molybdenum is also many.This explanation pass deformation of material under the warm-rolling temperature is also lower, and working plasticity also need improve.The cold deformation ability of magnesium alloy is relatively poor, need be heated to 250-480 ℃ usually and carry out the deformability that hot rolling improves sheet material, and need repeatedly to melt down repeatedly heating between rolling pass and carry out soft annealing.In course of hot rolling, also there are shortcomings such as grain growth, the easy oxidation in surface.Therefore reducing rolling temperature under the situation that does not change pass deformation also is significant.
Electroplastic is rolling to be a kind of novel process technology, and it is to apply pulse current in the metal deformation process simultaneously, and its machining deformation drag is descended significantly, thereby improves the processing characteristics of metal.Pulse current makes metal have good plastic deformation ability at a lower temperature, and can improve the mechanical property, surface quality etc. of workpiece, and low, the working (machining) efficiency advantages of higher of power consumption is arranged.In the Electroplastic process, machined material inside will produce fuel factor and non-thermal effect simultaneously, under both actings in conjunction, can greatly quicken the diffusivity of atom and the intensity of dislocation motion, open the entanglement of dislocation, and can finish crystallization again in very low temperature with in the time of extremely lacking, realize improving the purpose of microscopic structure.But vying each other of existing fuel factor of this process and non-thermal effect, both interdependences are arranged again, only the non-thermal effect with electric pulse can't make sample reach good working plasticity, only when fuel factor acquires a certain degree, non-thermal effect just can work, and realizes that the tissue of machined material inside improves.And in the former Electroplastic process, because the size of roll is big, its volume is far longer than the volume that is rolled the district, and the fuel factor component in the Electroplastic effect is sharply descended, and fails to realize the function that Electroplastic is desirable.
Summary of the invention
In order to solve warm-rolling plastic deformation is improved limited deficiency, simple Electroplastic is rolling to be difficult to satisfy problem such as rolling wide, thick material and the temperature rise that the rolling because pulse current of Electroplastic brings makes for a short time, make full use of the decline of the material deformation drag that the two advantage-be fuel factor and electrical effect bring respectively, the invention provides a kind of Electroplastic combines rolling difficult processing metal with warm plasticity method and system; Combine with electric plastic effect by the surface temperature that adopts suitable raising roll, be formed with the tissue that is beneficial to raising intensity and tough (moulding) property with the common micro-structural of improving difficult processing metal inside.
Electroplastic of the present invention combines the method for rolling difficult processing metal with warm plasticity, may further comprise the steps: adopt the roll preheating device with the upper and lower roll of milling train be preheating near or reach the recovery temperature of work metal material, and be lower than in the scope of recrystallization temperature of this metal material; Driving this metal material by decoiling equipment, wrap-up transmits with speed 0.1-1m/s, and rely on its fuel factor and non-thermal effect to carry out Electroplastic by the processing sections that the high energy pulse electric current that a pair of Electical connector with milling train insulation provides the pulse power is input to this metal material to handle, simultaneously the processing sections of this metal material described roll that enters preheating successively carry out that Electroplastic combines with warm plasticity rolling.
Wherein, described roll preheating device adopts electromagnetic induction heater, resistance heater or infrared heater etc.,, and can adjust according to described work metal properties of materials to 100-550 ℃ of scope by electromagnetic induction or the described roll of roasting mode preheating.
Described electromagnetic induction heater comprises two the circular arc eddy-current heating plate and the heating control circuits that have thermal probe, a circular arc eddy-current heating plate is installed in described topping roll upside, separate with a nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described topping roll, corresponding thermal probe contacts with described topping roll cylinder is moving; Another circular arc eddy-current heating plate is installed in described bottom roll downside, separates with another nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described bottom roll, and corresponding thermal probe contacts with described bottom roll cylinder is moving.
Described heating control circuit comprises rectifier filter, produces the inverter of 300-9000Hz AC signal, connects power amplifier and temperature detection control module that inverter is exported, described Dian Ci Qi answers the induction coil in the heating plate to be driven by power amplifier, and the temperature detection control module detects described upper and lower roller temperature by described thermal probe and controls power amplifier output and makes upper and lower roller temperature constant.
In the rolling process, by the processed section introducing high energy pulse electric current of described two Electical connectors to the described work metal material between them, the parameter of this high energy pulse electric current is: pulse width is 10-200 μ s, frequency is 100-3000Hz, and the current density amplitude is 30-1000A/mm
2
Realize that a kind of Electroplastic of the inventive method combines the system of rolling difficult processing metal with warm plasticity, comprising:
Milling train with roll, backing roll, decoiling equipment and wrap-up;
The roll preheating device, be used for upper and lower roll be preheating near or reach the recovery temperature of work metal material, and be lower than in the scope of recrystallization temperature of this metal material, this metal material is carried out warm plasticity handles;
The pulse power is provided for the high energy pulse electric current to this metal material Electroplastic processing, and this high energy pulse power frequency is that 100-3000Hz, pulse width are 10-200 μ s; And
A pair of Electical connector, they and described milling train insulate, be connected to two lead-out terminals of the pulse power, be used for processing sections that high energy pulse electric current with pulse power output is input to this metal material and carry out Electroplastic and handle, simultaneously the processing sections of this metal material enter by the described upper and lower roll of roll preheating device preheating carry out that Electroplastic combines with warm plasticity rolling.
The present invention combines warm plastic effect and successfully is applied to the rolling of difficult processing metal with the Electroplastic effect, adopt the roll preheating device with roller surface be preheating near or reach the recovery temperature of work metal material, and be lower than in the scope of recrystallization temperature of this metal material; Enter the preceding band of roll because the fuel factor that Electroplastic brings also has certain temperature rise.At this moment, in the operation of rolling, because roller surface is heated near recovery temperature, when the work metal material contacts with roll, the potential barrier of atom has obtained certain raising in the material, impels crystal defects such as point defect and dislocation to obtain energy and moves, and resistance of deformation descends; With the high energy pulse electric current compound action that is applied after, the internal electron of material motion aggravation more makes more dislocation start under the effect of high energy pulse electron stream and move.If roll does not have preheated, (shared volume is compared and is far smaller than roll when contacting with roll because of processed band because the fuel factor that Electroplastic is brought for the work metal material may be absorbed by cold roll rapidly, the thermal capacitance of its band also is far smaller than roll), the heat that causes contacting processed band of moment is nearly all absorbed by roll, greatly reduced the fuel factor of Electroplastic processing, weakened the diffusivity of atom, made the effect of Electroplastic effect be subjected to very big restriction.
The advantage of the rolling milling method that combines of the rolling and warm plasticity of Electroplastic of the present invention is to apply suitable high energy pulse electric current by online, make the initial static recrystallization process of metal material can be under heat treated temperature far below routine (for only about 100 ℃ of Mg alloy surface temperature) very promptly finish (only be several seconds, shorten 2 of deadlines of crystallization again more than the order of magnitude) than conventional heat treatment.Theory according to the Electroplastic effect, material internal has experienced the nonequilibrium process of the alternating movement of the quick input and output of energy under the high energy electric pulse incentive condition, this electro photoluminescence has promoted the acceleration diffusion of inner atom, makes dislocation climb speed present explosive growth.More conventional heat treatment and direct current heat treated, the joule heating effect that high energy electric pulse is produced when handling and the coupling mechanism of non-thermal effect, make its again the crystallization nucleation rate can improve several magnitude, the atom diffusion velocity doubles, and this is the key reason of the grain structure of the material perfect recrystallization that obtains refinement fast.Non-thermal effect has only at a certain temperature (being under the cooperation of certain fuel factor) competence exertion to come out, and does not have certain fuel factor, and non-thermal effect can not embody to the acceleration of atom diffusion with to the contribution of dislocation climb; If instead there is not the electro photoluminescence (can produce non-thermal effect simultaneously) of high energy pulse, only rely on fuel factor (promptly passing through common heating) to improve temperature to increase the method for dislocation climb speed, its process of finishing crystallization again will exceed two than the deadline under the Electroplastic more than the order of magnitude under equivalent environment.
The present invention can effectively utilize the warm plasticity and electric electric plasticity of rolling of warm-rolling, the micro-structural of improving metal material inside jointly is formed with and is beneficial to the tissue that improves intensity and tough (moulding) property, make the metal deformation drag reduce, single relatively warm-rolling or electricity roll the inventive method makes the plasticity of material improve a lot.The operation of rolling does not change normal work flow, does not need to enter heating furnace and carries out soft annealing just can realize tissue in the operation of rolling pre-adjustment, obtains high strong, toughness and cooperates; And working (machining) efficiency improves, cost reduces, and material that can rolling large-size is specially adapted to rolling wideer, thicker relatively large sheet material and band.With respect to hot rolling,, can reduce surface oxidation simultaneously, prevent grain growth, so can significantly improve product surface quality and mechanical property because the process temperature is lower.
Description of drawings
Fig. 1 combines the system schematic of rolling difficult processing metal with warm plasticity for Electroplastic of the present invention;
Fig. 2 is the picture that the Ti-Ni-Nb band of 10 * 2 * 1000mm ftractures under traditional warm-rolling;
Fig. 3 is that the Ti-Ni-Nb band of 10 * 2 * 1000mm is in the Electroplastic rolling sample pictures that combines with warm plasticity;
Fig. 4 is the AZ31 magnesium alloy band picture of cold rolling 100 * 2 * 1500mm of tradition, and obviously cracking appears in band in the picture;
Fig. 5 is the AZ31 magnesium alloy band picture of warm-rolling 100 * 2 * 1500mm, and deflection is about 15%, occurs obviously cracking in the band;
Fig. 6 is combine with the warm plasticity AZ31 magnesium alloy carry sample picture of 100 * 2 rolling * 1500mm of Electroplastic of the present invention, cumulative deformation 70%, and the centre is without any annealing in process;
Fig. 7 is that its electromagnetic induction heater and roll are in conjunction with schematic diagram;
Fig. 8 is the circular arc eddy-current heating plate development figure of Fig. 7;
Fig. 9 is the thermal probe structural representation of Fig. 7;
Figure 10 is a heating control circuit figure of Fig. 7 electromagnetic induction heater.
The specific embodiment
Further specify below in conjunction with accompanying drawing.Combine the system of rolling difficult processing metal with warm plasticity with reference to Fig. 1 Electroplastic, this system comprises milling train, the pulse power 3, two Electical connectors and roll preheating device (as Fig. 7-10) etc.
Milling train can adopt two-roller mill or multi-roll mill, and two-roller mill can roll plate, band thicker, that required precision is not high, and multi-roll mills such as four rollers can roll high-precision thin plate, band.Fig. 1 adopts two-roller mill, and this milling train has decoiling equipment 1, top and bottom rolls 6, wrap-up 8 and jockey pulley 2,7 etc.Drive this sheet metal strip/thin plate transmission by decoiling equipment 1, wrap-up 8, transmission speed is 0.1-1m/s.
The pulse power 3 is provided for the high energy pulse electric current to the processing of metal material Electroplastic, when Electroplastic combines rolling difficult processing metal with warm plasticity, the pulse current parameter that puts on metal material is: pulse width 10-200 μ s, frequency 100-3000Hz, the current density amplitude is 30-1000A/mm
2
Two Electical connectors 4,5 or 5 ' and described milling train SI semi-insulation are connected to two outputs of the pulse power 3, are used for processing sections that high energy pulse electric current with pulse power output is input to the work metal material and carry out Electroplastic and handle.Before a contact device 4 places topping roll 6 among Fig. 1, be connected in the positive output end of the pulse power 3, another contact device substitutes with topping roll 6, topping roll and the insulation of described milling train, and the axle 5 of topping roll 6 is connected in the negative output terminal of the pulse power 3.Two Electical connectors also can be arranged at respectively before and after the described top and bottom rolls, as contact device 4 before the top and bottom rolls as described in being positioned among Fig. 1 and as described in another contact device 5 ' behind the top and bottom rolls.Two Electical connectors can also use upper and lower two rolls with described milling train insulation to substitute, and the distance between this moment two Electical connectors is zero.According to the difference of work metal material material, and put on the pulse current parameter difference of work metal material, the distance between two Electical connectors is preferably in the 0-800mm regulates.Usually an Electical connector of uncoiling end can be provided with at distance roll 0-400mm place, and another contact device of rolling end can be provided with at distance roll 0-600mm place.The material of Electical connector is dispersion-strengthened Cu or the good high-abrasive material of other conduction that electric conductivity is good, intensity is higher, and Electical connector is equipped with spring, can remain metal material and closely contact with Electical connector.
The roll preheating device be used for upper and lower roll be preheating near or reach the recovery temperature of work metal material, and be lower than in the scope of recrystallization temperature of this metal material, handle this metal material is carried out warm plasticity.The roll preheating device adopts electromagnetic induction heater, resistance heater and infrared heater etc.,, and can adjust according to the work metal properties of materials to 100-550 ℃ of scope by electromagnetic induction or the described roll of roasting mode preheating.Fig. 7-9 is its electromagnetic induction heater structural representation.7-1 is a thermal probe among Fig. 7, and 7-2 is the eddy-current heating plate, and 7-3 is nonmetal heat-resisting isolating pad, and 7-4 is a roll mandrel, and 6 is upper and lower roll, and 7-6 is the thermal probe hole, and 8-2 is the coil stationary plate, and 000 is the work metal band.8-1 is an induction coil among Fig. 8, and 8-2 is the coil stationary plate, and 8-3,8-4 are the joints of load coil.9-1 thermal probe lead-out wire among Fig. 9,9-2 establishes spring in the thermal probe, and 9-3 is nonmetal fastening cap, the spring contact of 9-4 thermal probe.
This electromagnetic induction heater comprises two the circular arc eddy-current heating plate 7-2 and the heating control circuits that have thermal probe, a circular arc eddy-current heating plate 7-2 is installed in described topping roll 6 upsides by mill stand, corresponding thermal probe contacts with described topping roll cylinder is moving, and separate with a nonmetal heat-resisting isolating pad 7-3 between this circular arc eddy-current heating plate 7-2 and the described topping roll 6 and be fixed on the relevant frame, can prevent that topping roll 6 high temperature from passing to thermoinduction plate inner inductive coil 8-1 overtemperature and damaging and cause short circuit by coil stationary plate 8-2; Another circular arc eddy-current heating plate is installed in described bottom roll downside, separates with another nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described bottom roll, and corresponding thermal probe contacts with described bottom roll cylinder is moving.Thermal probe has spring 9-2 and the spring contact 9-4 that establishes in housing 7-1, the housing, the probe hole 7-6 place that thermal probe is installed on circular arc eddy-current heating plate 7-2 center is located by nonmetal fastening cap 9-3, an end and described topping roll or the moving temperature that contacts with the detection roller surface of bottom roll cylinder that spring contact 9-4 appears from housing.
Figure 10 heating control circuit comprises rectifier filter, produces the inverter of 300-9000Hz AC signal, connects power amplifier, temperature detection control module and over-current detection protection control module etc. that inverter is exported; described Dian Ci Qi answers the induction coil 8-1 in the heating plate to be driven by power amplifier, and the temperature detection control module detects described upper and lower roller temperature by described thermal probe and controls power amplifier output and makes upper and lower roller temperature constant.Power frequency 50Hz Ge 60Hz exchanges to become through rectifying and wave-filtering and is direct current, again it is transformed into the 300-9000Hz high-frequency alternating current, after-applied induction coil 8-1 in each eddy-current heating plate 7-2 produces alternating magnetic fields through power amplification, utilize the higher alternating magnetic field of its frequency to produce eddy current and reach heating purposes at top and bottom rolls 6, can adjust the temperature of roll by regulating electric current or frequency, the sixth of the twelve Earthly Branches is through heating and mix up 6 pairs of sheet metal strips of being processed of top and bottom rolls, the 000 enforcement warm-rolling in gap.Thermal probe is contained in the probe hole 7-6 place at eddy-current heating plate 7-2 center, prevent that by nonmetal fastening cap 9-3 location producing vortes interference by the thermal probe metal detects roller temperature, the temperature detection control module detects roller temperature by thermal probe and controls power amplifier output and makes roller temperature constant.
By Fig. 1 of the present invention system metal tape material etc. is carried out Electroplastic and combine with warm plasticity when rolling, at first the upper and lower roll of milling train is preheating to 100-550 ℃ of scope by the roll preheating device; This sheet metal strip is transmitted with speed 0.1-1m/s, and rely on its fuel factor and non-thermal effect to carry out Electroplastic by the processing sections that a pair of Electical connector is input to this sheet metal strip with the high energy pulse electric current to handle, simultaneously the processing sections of this sheet metal strip roll that enters preheating successively carry out that Electroplastic combines with warm plasticity rolling.Describe in detail below in conjunction with embodiment.
Embodiment 1: adding labor and materials is the TiNiNb band of cold working attitude, and wide 10mm, thickness are 1.90mm, carries out traditional warm-rolling and rolling mode of the present invention and is Electroplastic and roll to combine with warm-rolling and be rolled contrast.
The above-mentioned TiNiNb band of warm-rolling, the roller diameter 300mm of milling train, the band entrance velocity is 0.1m/s.Roll is heated to 250 ℃, the TiNiNb thickness of strip is rolled 1.25mm from 1.90mm, find that obvious cracking all appears in strip edge and center, as shown in Figure 2 by two passages.
Adopt the inventive method rolling with reference to Fig. 1, still get the TiNiNb band of cold working attitude.By electromagnetic induction heater roll also is heated to 250 ℃, by open, wrap-up drives the TiNiNb band and transmits with speed 0.1m/s, two Electical connectors 4 and 5 s' distance adjustment is 360mm, and by the processing sections of two Electical connectors with high energy pulse electric current importing TiNiNb band, the pulse frequency of this high energy pulse electric current is that 500Hz, pulse width are that 60 μ s, current density amplitude are 500A/mm
2, rely on its fuel factor and non-thermal effect that the processing sections of TiNiNb band is carried out Electroplastic and handle, simultaneously this processing sections roll of entering preheating successively carry out that Electroplastic combines with warm plasticity rolling.Through two passages are rolling the TiNiNb thickness of strip is rolled 1.25mm from 1.90mm equally, TiNiNb band plasticity be improved significantly, the rolling as shown in Figure 3 sample that obtains is cracking not.
Embodiment 2: adding labor and materials is full annealing attitude AZ31 magnesium alloy strip, and wide 100mm, thickness are 1.60mm, carries out pair rolling, warm-rolling and Electroplastic of the present invention respectively and adds warm-rolling composite rolling mode and be rolled experiment.
Adopt the milling train among Fig. 1, roller diameter 300mm, mill speed is 0.2m/s.Pair rolling under the cold rolling employing room temperature, the result obviously cracking just occurs at deflection about 15% (promptly thick from the thick 1.35mm that rolls into of 1.60mm) AZ31 magnesium alloy strip, as shown in Figure 4.
During warm-rolling, roll 6 is heated to 160 ℃, the AZ31 magnesium alloy strip during near roll heat pass on the band from roll rapidly, roll applies roll-force simultaneously, mill speed is 0.2m/s.Roll to 0.68 mm(1.60 → 1.12 → 0.85 → 0.68mm from 1.60mm is thick through three the rolling back of passage bands; Cumulative deformation is 58%), this moment, obvious cracking also appearred in AZ31 magnesium alloy strip surface, as shown in Figure 5.
In Electroplastic of the present invention and technology that warm-rolling combines, by electromagnetic induction heater the temperature of roll still is heated to 160 ℃, two Electical connectors 4 and 5 s' distance is 180mm, apply the high energy pulse electric current by Electical connector 4,5 processing sections to the AZ31 magnesium alloy strip, the parameter of pulse current is: pulse frequency is 300Hz, pulse width 60 μ s, the current density amplitude is 100A/mm
2Mill speed is 0.2m/s, through four rolling (1.60 → 1.12 → 0.85 → 0.68 → 0.48mm of passage; Cumulative deformation reaches 70%), 100mm is wide, and thickness is that the AZ31 magnesium alloy strip of 1.60mm rolls into the strip that thickness is 0.48 mm, magnesium alloy strip ftractures in this process as shown in Figure 6.As seen, adopt warm-rolling to roll the rolling mode that combines with electric, magnesium alloy plastic deformation ability greatly improves, and rolling magnesium alloy strip surface quality of coming out is good, does not have obvious crackle, also the non-oxidation layer.What particularly point out is to adopt the rolling magnesium alloy strip of this technology, does not enter any heat-treatment furnace in the operation of rolling of middle 4 passages and carries out soft annealing.
Electroplastic of the present invention is moulded with temperature and is combined sheet material/band that milling method is specially adapted to difficult processing metals such as rolling magnesium alloy, TiNi marmem, tungsten alloy, this sheet material/band width be 10-1200mm, thickness is 0.3-5mm, and length is not less than 300mm.Among the present invention sheet metal or band by open, wrap-up drives, mill speed is adjustable in the 0.1-1m/s scope, and when mill speed was adjusted to 0.6m/s among the embodiment 2, corresponding pulse frequency still was 300Hz, pulse width is 100 μ s, and the current density amplitude is at 150A/mm
2About, roll 6 still is heated to 160 ℃, and the AZ31 magnesium alloy strip that rolls out obtains desirable effect too.Open, wrap-up carries out tension adjustment as required, this milling method is specially adapted to the coiled material of rolling length.The replacing roll changes the wire rod of difficult processing metals such as also can being applicable to rolling magnesium alloy, TiNi marmem, tungsten alloy etc.
Claims (10)
1. an Electroplastic combines the method for rolling difficult processing metal with warm plasticity, it is characterized in that may further comprise the steps:
Adopt the roll preheating device that the upper and lower roll of milling train is preheating to the recovery temperature of work metal material, and be lower than in the scope of recrystallization temperature of this metal material;
Driving this metal material by decoiling equipment, wrap-up transmits with speed 0.1-1m/s, and rely on its fuel factor and non-thermal effect to carry out Electroplastic by the processing sections that the high energy pulse electric current that a pair of Electical connector with milling train insulation provides the pulse power is input to this metal material to handle, simultaneously the processing sections of this metal material described roll that enters preheating successively carry out that Electroplastic combines with warm plasticity rolling.
2. the method for claim 1, it is characterized in that: described roll preheating device adopts electromagnetic induction heater, resistance heater or infrared heater,, and can adjust to 100-550 ℃ of scope by electromagnetic induction or the described roller surface of roasting mode preheating according to described work metal properties of materials.
3. method as claimed in claim 2, it is characterized in that: described electromagnetic induction heater comprises two the circular arc eddy-current heating plate and the heating control circuits that have thermal probe, a circular arc eddy-current heating plate is installed in described topping roll upside, separate with a nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described topping roll, corresponding thermal probe contacts with described topping roll cylinder is moving; Another circular arc eddy-current heating plate is installed in described bottom roll downside, separates with another nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described bottom roll, and corresponding thermal probe contacts with described bottom roll cylinder is moving.
4. method as claimed in claim 3, it is characterized in that: described heating control circuit comprises rectifier filter, produces the inverter of 300-9000Hz AC signal, connects power amplifier and temperature detection control module that inverter is exported, described Dian Ci Qi answers the induction coil in the heating plate to be driven by power amplifier, and the temperature detection control module detects described upper and lower roller temperature by described thermal probe and controls power amplifier output and makes upper and lower roller temperature constant.
5. method as claimed in claim 1 or 2, it is characterized in that: in the operation of rolling, introduce the high energy pulse electric current by described two Electical connectors to the processing sections of the described work metal material between them, the parameter of this high energy pulse electric current is: pulse width is 10-200 μ s, frequency is 100-3000Hz, and the current density amplitude is 30-1000A/mm
2Distance between described two Electical connectors is 0-800mm.
6. method as claimed in claim 5 is characterized in that: described two Electical connectors are arranged at respectively before and after the described top and bottom rolls; Or described two Electical connectors substitute with upper and lower two rolls, these upper and lower two rolls with respectively with described milling train insulation; Or in described two Electical connectors one place described topping roll before, another is described topping roll, the insulation of this topping roll and described milling train.
7. the method for claim 1, it is characterized in that: described work metal material is the sheet material/band of magnesium alloy, TiNi marmem or tungsten alloy, the width of this sheet material/band is 10-1200mm, and thickness is 0.3-5mm, and length is not less than 300mm.
8. an Electroplastic combines the system of rolling difficult processing metal with warm plasticity, comprising: the milling train with roll, backing roll, decoiling equipment and wrap-up; It is characterized in that also comprising:
The roll preheating device is used for upper and lower roll is preheating to the recovery temperature of work metal material, and is lower than in the scope of recrystallization temperature of this metal material, handles this metal material is carried out warm plasticity;
The pulse power, it is that 100-3000Hz, pulse width are the high energy pulse electric current of 10-200 μ s that frequency is provided; And
A pair of Electical connector, they and described milling train insulate, be connected to two lead-out terminals of the pulse power, be used for processing sections that high energy pulse electric current with pulse power output is input to this metal material and carry out Electroplastic and handle, simultaneously the processing sections of this metal material enter by the described upper and lower roll of roll preheating device preheating carry out that Electroplastic combines with warm plasticity rolling.
9. system as claimed in claim 8 is characterized in that: described roll preheating device adopts electromagnetic induction heater, resistance heater or infrared heater; Wherein, described electromagnetic induction heater comprises two the circular arc eddy-current heating plate and the heating control circuits that have thermal probe, a circular arc eddy-current heating plate is installed in described topping roll upside, separate with a nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described topping roll, corresponding thermal probe contacts with described topping roll cylinder is moving; Another circular arc eddy-current heating plate is installed in described bottom roll downside, separates with another nonmetal heat-resisting isolating pad between this circular arc eddy-current heating plate and the described bottom roll, and corresponding thermal probe contacts with described bottom roll cylinder is moving.
10. system as claimed in claim 9, it is characterized in that: described thermal probe has spring and the spring contact of establishing in housing, the housing, the probe hole place that thermal probe is installed on circular arc eddy-current heating plate center is located by nonmetal fastening cap, and the end that spring contact appears from housing moves with described topping roll or bottom roll cylinder and contacts; Described heating control circuit comprises dc source, produces the inverter of 300-9000Hz AC signal, connects power amplifier and temperature detection control module that inverter is exported, described Dian Ci Qi answers the induction coil in the heating plate to be driven by power amplifier, and the temperature detection control module detects described upper and lower roller temperature by described thermal probe and controls power amplifier output and makes upper and lower roller temperature constant.
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| CN102912271A (en) * | 2012-10-24 | 2013-02-06 | 中国航空工业集团公司北京航空材料研究院 | Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy |
| CN103352195A (en) * | 2013-08-01 | 2013-10-16 | 哈尔滨工业大学 | High-density pulse current strengthening-toughening treatment method for deformation strengthening tungsten alloy |
| CN103352194A (en) * | 2013-07-19 | 2013-10-16 | 清华大学深圳研究生院 | Method and equipment for improving shape memory alloy superelasticity |
| CN104264086A (en) * | 2014-09-24 | 2015-01-07 | 清华大学深圳研究生院 | Method for promoting phase change strengthening and toughening of two-phase titanium alloy strip by using pulse current and strip |
| CN104388866A (en) * | 2014-11-21 | 2015-03-04 | 北京工业大学 | Adjusting and controlling method for rare-earth tungsten/molybdenum tissues |
| CN104630679A (en) * | 2015-01-23 | 2015-05-20 | 清华大学深圳研究生院 | Functional gradient titanium alloy strip and preparation method thereof |
| CN105033016A (en) * | 2015-07-13 | 2015-11-11 | 山东大学（威海） | Magnesium alloy sheet electroplastic incremental forming method |
| CN105624594A (en) * | 2016-03-28 | 2016-06-01 | 西安交通大学 | Online heat treatment method for copper-based niobium-titanium superconducting material |
| CN105912746A (en) * | 2016-03-25 | 2016-08-31 | 吉林大学 | Mechanical model building method based on mould temperature rise rate under condition of continuous plastic processing and production and application thereof |
| CN106077092A (en) * | 2016-06-24 | 2016-11-09 | 燕山大学 | The device of the low electric heating Pulse Electric Current with High Density assistant metal operation of rolling |
| CN106914489A (en) * | 2017-04-17 | 2017-07-04 | 燕山大学 | A kind of rolling device and method for preparing function-graded material |
| CN107803402A (en) * | 2017-10-31 | 2018-03-16 | 邵阳高华工贸实业有限公司 | A kind of cold-rolled steel sheet preparation method for high-end equipment manufacturing |
| CN108339852A (en) * | 2018-02-10 | 2018-07-31 | 太原理工大学 | A kind of milling method applying pulse current on roll |
| CN108660396A (en) * | 2018-04-23 | 2018-10-16 | 深圳万佳互动科技有限公司 | A kind of TiAl composite materials of big distortion |
| CN108906891A (en) * | 2018-06-26 | 2018-11-30 | 哈尔滨工业大学 | Large area functional micro structure array electric current assists Roll forming apparatus |
| CN109433823A (en) * | 2018-11-08 | 2019-03-08 | 燕山大学 | A kind of rolling device and method based on Hall effect preparation functionally graded material |
| CN109482690A (en) * | 2018-10-31 | 2019-03-19 | 南京航空航天大学 | A kind of electric current auxiliary rolling formation method of difficult-to-deformation material odd-shaped cross section pipe fitting |
| CN109932388A (en) * | 2019-04-04 | 2019-06-25 | 西北工业大学 | A kind of Electroplastic fuel factor and non-thermal effect decouple separation method |
| CN110592430A (en) * | 2019-10-23 | 2019-12-20 | 太原理工大学 | TiAl alloy plate thermo-electric coupling non-sheath preparation method |
| CN111235513A (en) * | 2020-03-11 | 2020-06-05 | 太原理工大学 | Preparation method of magnetic stainless steel chip core composite steel |
| CN111360145A (en) * | 2020-02-17 | 2020-07-03 | 中南大学 | Electric pulse auxiliary micro-stretching process for superfine crystal metal foil |
| CN111515248A (en) * | 2020-04-24 | 2020-08-11 | 燕山大学 | Vacuum electric rolling device and method for online adjusting roughness of iron-based amorphous strip |
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| CN102912271B (en) * | 2012-10-24 | 2014-08-13 | 中国航空工业集团公司北京航空材料研究院 | Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy |
| CN102912271A (en) * | 2012-10-24 | 2013-02-06 | 中国航空工业集团公司北京航空材料研究院 | Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy |
| CN103352194A (en) * | 2013-07-19 | 2013-10-16 | 清华大学深圳研究生院 | Method and equipment for improving shape memory alloy superelasticity |
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| CN109932388A (en) * | 2019-04-04 | 2019-06-25 | 西北工业大学 | A kind of Electroplastic fuel factor and non-thermal effect decouple separation method |
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| CN110592430B (en) * | 2019-10-23 | 2021-04-23 | 太原理工大学 | TiAl alloy plate thermo-electric coupling non-sheath preparation method |
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