CN203108932U - Metal electricity-plasticity asymmetrical rolling system - Google Patents
Metal electricity-plasticity asymmetrical rolling system Download PDFInfo
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- CN203108932U CN203108932U CN 201320047891 CN201320047891U CN203108932U CN 203108932 U CN203108932 U CN 203108932U CN 201320047891 CN201320047891 CN 201320047891 CN 201320047891 U CN201320047891 U CN 201320047891U CN 203108932 U CN203108932 U CN 203108932U
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Abstract
A metal electricity-plasticity asymmetrical rolling system comprises a rolling mill and a pulsed power supply, wherein the rolling mill is provided with a transmission roller, a guiding roller, an upper mill roll and a lower mill roll. The upper mill roll, the lower mill roll and the guiding roller are respectively insulated from a supporting body of the rolling mill. High energy pulse current output by the pulsed power supply is input to a machining section of a metal mill bar in motion through the upper mill roll and the lower mill roll or through the lower mill roll and the guiding roller. Electricity-plasticity rolling and asymmetrical rolling of the machining section of the metal mill bar are achieved through asynchronous rotation of the upper mill roll and the lower mill roll. Through the combined action of electricity-plasticity effect and twisting and rolling effect of metal, rolling deformation resistance can be reduced to a large degree, metal materials can be rolled in a non-annealing rolling or small-annealing rolling mode at low machining temperature, the purposes of saving energy and improving production efficiency are achieved, and the problems of oxidation of the surface of the metal, roll banding of a rolled piece and the like are solved.
Description
Technical field
The utility model belongs to the metal material rolling technical field, it specifically is a kind of metal Electroplastic asymmetrical rolling system, this system can finish the rolling and asymmetrical rolling of the Electroplastic of metal rolled piece simultaneously and handle, realized to the metal rolled piece under lower roll-force and lower rolling temperature nothing annealing or anneal rolling less.
Background technology
Metallic plate, band are one of important raw and processed materials of many industrial circles, and its quality will directly have influence on production process, production cost and the end product quality of relevant industries such as aviation, automobile, electronics, communication.Because in the plurality of advantages of aspects such as production efficiency, constant product quality, rollingly widely adopted by industrial quarters, be present topmost metallic plate, the band mode of production.
Along with the fast development of relevant industries and the variation of market comsupton structure, new consumer field requires (comprising plate shape, thickness and precision, surface quality, material property etc.) to improve day by day to metallic plate, quality of strip, and this makes original rolling equipment and technology be difficult to satisfy the requirement of new product.For example, for difficult deformable metals such as magnesium alloys, its conventional processing method is hot rolling or " cold rolling+annealing ".The former exists the difficult control of size, problems such as intensity index is low, the performance inconsistency scope big, grain growth, surface quality difference.The latter relates to the annealing of melting down repeatedly, has improved energy consumption greatly, has reduced production efficiency.In addition, higher roll-force causes mill spring and roll elastic bending easily in the cold-rolled process, the former makes rolled piece longitudinal thickness precise decreasing, the latter makes that rolled piece plate shape is bad, when the required average unit pressure of rolled piece generation plastic deformation surpasses the required unit pressure of roll generation elastic flattening, rolled piece just reaches the minimum rolled thickness under this condition, can't continue to roll thin again.
For above problem, the scientific worker has provided some solutions separately both at home and abroad, and its purport all is to reduce the strain of milling train.The solution of Chu Xianing is to improve mill stiffness by increasing backing roll at working roll at first, to reach the purpose that reduces the milling train strain.Yet rolled piece is more thin, and roll-force is more big, the also corresponding increase of required roll number, and rolling equipment complexity and production cost significantly improve thereupon.In the forties in last century, external scientist has proposed the employing asynchronous rolling process and has produced plate, band, and its characteristics are that the linear velocity of two rolls there are differences, and the zone of slippage on the delivery side in conventional synchronization is rolling, the zone of slippage on the entry side, also exists to rub with the hands on the rolled piece and rolls the district.In the middle of the district is rolled in stranding, the effect of the shear stress that rolled piece is also added except being subjected to synchronously rolling three-dimensional compressive stress, this new stress state is compared with conventional synchronization is rolling, hydrostatic pressure significantly reduces, (experiment shows, as if adopting identical drafts, asymmetrical rolling and synchronous rolling comparing effectively to have reduced the required external force of material deformation, approximately roll-force can be reduced by 10%), thus the strain of milling train reduced.
In recent years, the next professor of Tang of Tsing-Hua University state had proposed the Electroplastic rolling technique.This technology is that the Electroplastic effect with metal applies to during metallic plate, band produce, the example is: by the metal in the deformation process is applied pulse current, utilize the fuel factor of pulse current and the coupling of non-thermal effect, reach the reduction resistance of deformation, improve the purpose of metal plastic deformation ability.Simultaneously, under the effect of pulse current, processes such as room diffusion are significantly accelerated, thereby significantly improved the speed of the softening process such as answer, recrystallization of metal, weakened work hardening, remove or reduced the intermediate annealing link from, make production efficiency be greatly improved, in addition, its lower deformation temperature has been avoided the oxidation of metal in process, its surface quality of products is better than the surface quality of hot-rolled product, saves to a certain extent or has reduced steps such as pickling, has shortened work flow.
The distortion of materials drag is reduced, and separately based on different physical essence (the former changes stress state, and the latter is that the mode of importing energy helps dislocation to overcome energy barrier).Therefore, if can create a kind of new technology and equipment the two advantage is combined, just can further reduce roll-force, realize the metal rolled piece in lower roll-force and the annealing of the nothing under the rolling temperature or anneal rolling less.
Summary of the invention
For solve in the prior art roll-force reduce limited, milling train utilizes insufficient and problem such as rolling mill practice long flow path, the utility model provides a kind of metal Electroplastic asymmetrical rolling system, this system rolls effect with metal Electroplastic effect and stranding and cooperates with the metal rolled piece, the rolling deformation drag is significantly reduced, the strain of milling train reduces in the operation of rolling, technological process is shortened, and production efficiency improves.
The metal Electroplastic asymmetrical rolling system that the utility model provides comprises:
One milling train, this milling train comprise and unreel device, coiler, and two groups of conduction rollers are arranged at the upper and lower rolls of these the two groups a pair of asynchronous rotations between the conduction roller and two pairs of guide rollers; Described topping roll, bottom roll and described two pairs of guide rollers all with the insulation of the supporter of described milling train;
One pulse power, the high energy pulse electric current of described pulse power output is input to the processing sections of the metal stocking of motion by described topping roll and bottom roll or by one of described bottom roll and described two pairs of guide rollers, and the processing sections of described metal stocking is by the rolling and asymmetrical rolling of described upper and lower roll realization Electroplastic of asynchronous rotation.
Further comprise a quenching unit, this quenching unit has cooling liquid bath, pump and is connected in two shower nozzles of this pump by conduit, these two shower nozzles are attached to the both sides of described roll, can respectively or carry out press quenching to described roll both sides metal material simultaneously and handle.
Further comprise the screwdown gear that places described roll, gather and record the roll-force data acquisition unit of pressure in real time, and invest the temperature data acquisition device that described roll both sides, collection and the described metal material of record are gone into roll and gone out roll.
Wherein, described conduction roller, topping roll, bottom roll are set up the heater of isolating with described milling train heat respectively, and the heating-up temperature scope is 50-350 ℃.
Described conduction roller comprises some roller bearings, and this roller bearing is in the cavity that heat insulation asbestos and refractory material surround, and establishes heater in this roller bearing, can be implemented in the 50-350 ℃ of scope roller bearing and heat.Described roller surface is through specially treated, and roller surface disposes wear-resisting, heat-resisting insulating ceramics coating.
Described guide roller is the pair of conductive wheel.
The friction speed of described upper and lower roll is than being 1:1-2:1, and the diameter of described upper and lower roll is identical, the rotating speed difference; Or described upper and lower roller diameter difference, rotating speed is identical.
The described pulse power is exported unidirectional steep sharp wave, and its power is 10-40KW, and voltage magnitude is 10-300V, and pulse frequency is 1-3000Hz, and pulse width is 20-5000 μ s.
The positive and negative output of the described pulse power connects described upper and lower roll respectively; Or the positive and negative output of the described pulse power connects respectively near described a pair of guide roller and the described bottom roll that unreels device.
The utility model is compared with traditional rolling system, has following advantage:
1, rolls the synergy of effect by metal Electroplastic effect and stranding, can significantly reduce the rolling deformation drag, reduce the strain of milling train in the operation of rolling, improve the thickness and precision of metal material and the control accuracy of plate shape.
2, compare with cold rolling system, the utility model applies the high energy pulse electric current to rolled piece in process, this pulse current causes fuel factor and non-thermal effect, improve the atom diffusivity, help dislocation to overcome energy barrier, open entanglement, break away from pinning, promote it to climb and hand over slippage, be beneficial to the carrying out of softening process such as answer and recrystallization, deformation energy is released, defect concentration is minimized, and significantly promotes plastic deformation, thereby can increase metallic plate, the single pass reduction ratio of band, reduce the intermediate annealing number of times in the operation of rolling, be implemented in than under the low processing temperature to the annealing of the nothing of metal material or anneal rollingly less, reach energy savings, promote the purpose of production efficiency.
3, compare with hot rolling system, the utility model system can realize the continuous rolling of metal material under lower temperature, effectively alleviated the grain growth problem, has avoided problems such as the oxidation of metal surface and rolled piece roll banding.
4, compare with synchronous rolling system, two rolls that the utility model system adopts can have different linear velocities, under the situation of identical reduction ratio, because the effect of detrusion, can realize higher effective deformation amount, be beneficial to and improve the recrystallization nucleation rate, be beneficial to the realization grain refinement.
Description of drawings
Fig. 1 is the utility model metal Electroplastic asymmetrical rolling system schematic;
Fig. 2 is milling train screwdown gear schematic diagram shown in Figure 1;
Fig. 3 is guide roller schematic diagram shown in Figure 1;
Fig. 4 is conduction roller schematic diagram shown in Figure 1;
Fig. 5 is the schematic diagram of the utility model current loop embodiment 1;
Fig. 6. be the schematic diagram of the utility model current loop embodiment 1.
The specific embodiment
Be described further below in conjunction with the embodiment accompanying drawing.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Metal Electroplastic asymmetrical rolling shown in Figure 1 system mainly comprises milling train and the pulse power 9 etc.Milling train is computer-controlled asynchronous rolling machine.Milling train comprises and unreels device 1, coiler 8, two groups of conduction rollers 3,6, be arranged at the upper and lower roll 4 of these the two groups a pair of asynchronous rotations of conduction between the roller, 5, the two pairs of guide rollers 2,7, roll-force data acquisition unit 11, temperature data acquisition device (not shown), electric current applies mode selector switch 10, control computer 12, screwdown gear 13 and quenching unit 14 etc.
Conduction roller 3 and 6, topping roll 4, bottom roll 5 all with the heater of milling train heat isolation.Conduction roller 3 and 6 is among the cavity that heat-barrier material constitutes, and its heating-up temperature is adjustable in 50-350 ℃ of scope.
Unreel device 1 and coiler 8 and be separately positioned on the supporter two ends of milling train, with uncoiling, the pre-rolled metal material of rolling.The two pairs of guide rollers 2 and 7 are the pair of conductive wheel, and this conductive casters preferably uses the metallic conduction wheel.Topping roll 4, bottom roll 5 and described two pairs of guide rollers all with the insulation of the supporter of described milling train.Two groups of conduction rollers 3 and 6 are arranged between described two pairs of guide rollers, and every group of conduction roller comprises respectively for the some roller bearings that support the rolled metal material.Topping roll 4, bottom roll 5 are arranged between described two groups of conduction rollers, in order to the rolled metal material.
Roll-force data acquisition unit 11 all is connected with computer 12 with temperature data acquisition device 14, is separately positioned on the two ends of screwdown gear 13 and topping roll 4, bottom roll 5, is used for gathering in real time roll-force data and the temperature data of processing sections.
The negative output terminal of the pulse power 9 connects bottom roll 5, and the positive output end of the pulse power 9 connects the moving contact that electric current applies mode selector switch 10, and electric current applies three of mode selector switch 10 to be decided contact and connect two pairs of guide rollers 2,7 and topping roll 4 respectively.Electric current applies mode selector switch 10 and is arranged in the current loop that the pulse power 9 and metal material form, and can select pulse current is imported the path of the processing sections of metal material.
Quenching unit 14 has cooling liquid bath, pump and is connected in two shower nozzles of this pump by conduit, and these two shower nozzles are attached to the both sides of described roll, can respectively or carry out press quenching to described roll both sides metal material simultaneously and handle.
Native system arranges upper and lower roll 4,5 and conduction roller 3,6 temperature earlier in use, opens milling train then.Pre-rolled metal material (or metal stocking) is by unreeling device 1 and coiler 8 support and tensionings, this system can adjustment of tonicity, guarantee the stability in this metal material motion process, the frictional force between the roll of rotation and this metal material drives this metal material and moves to coiler 8 directions with certain speed.Plastic deformation takes place in this metal material at the roll place, realize attenuate, and the movement velocity of metal material changes with roll rotational speed, and roll rotational speed is by frequency converter and the control of motor (not shown), and is adjustable continuously in the 0-636r/min scope.Roll-force data acquisition unit 11 in the screwdown gear 13 can be measured and record in real time to the roll-force in the operation of rolling.The roll both sides are all with quenching unit 14, can be respectively or roller is surveyed and the metal material that goes out the roller side carries out press quenching to going into simultaneously.
During the continuous motion from left to right of this metal material, the pulse power 9 applies mode selector switch 10 as Fig. 1 by bottom roll, electric current and guide roller 2 is applied to pulse current on the processing sections of this metal material, behind this metal material upper and lower roll 4 of process and 5 asymmetrical rollings, by conduction roller 6 and guide roller 7,8 places carry out rolling at coiler immediately.During the processing sections asymmetrical rolling of upper and lower roll 4 and 5 pairs of these metal materials, be attended by the Electroplastic effect that pulse current causes simultaneously and realized that the Electroplastic of this processing sections is rolling.
Upper and lower roll by changing different-diameter (perhaps adopt two overlap the upper and lower roll that speed changer is independently controlled same diameter respectively) can obtain any friction speed ratio between the 1:1-2:1.Can select the diameter of upper and lower roll can be identical equally, the rotating speed difference.
The power of the pulse power 9 is 10-40KW, output voltage amplitude is 10-300V, and pulse width is 20-5000 μ s, and pulse frequency is 1-3000Hz, the pulse peak current density is 10-1000A/mm2 when being applied to the processing sections of metal material, and impulse waveform is unidirectional steep sharp wave.Its electrical quantity can be gathered, record and show by current sensor and oscillograph are set.
Hand screwdown gear shown in Figure 2, in use, 132 rotations of rotating wheel 131 driven gears, to horizontally rotate the motion that is converted on the vertical direction by gear 133 and screw rod 134, screw rod 134 acts on the roll-force data acquisition unit 11, and be applied on the roll bearing piece 41 relative slip between drive tab 41 and the frame by bearing 135.Adopt spring to be connected between drive tab 41 and the drive tab 51, avoid drive tab 41 in self gravitation effect lower edge frame to lower slider.
As shown in Figure 3, the two pairs of guide rollers 2 and 7 all adopt conductive metallic material to make, and diameter is about 100mm, and the conductive casters that width is about roll width constitutes, and its roll gap spacing is by housing screw 21 manual adjustments, and it is similar that its principle and aforementioned roll are depressed Principles of Regulation.Apply downward active force for guide roller 24 by housing screw 21, pad 22, bearing 23, make it slide to reach the purpose of regulating suitable roll gap along frame inner wall.For guaranteeing contact well to reduce contact resistance, metal material surface should clean, and guide roller should form certain cornerite with the uncoiling metal material simultaneously, and metal material is had certain thrust.
As shown in Figure 4, conduction roller 3 comprises some roller bearings 33, and this roller bearing 33 is in the cavity that heat insulation asbestos 31 and refractory material 32 surround, and establishes heater in this roller bearing 33, can be implemented in the 50-350 ℃ of scope roller bearing 33 and heat.Described roller bearing 33 surface configuration have wear-resisting, heat-resisting insulating coating, as insulating ceramics coating etc.
With reference to Fig. 5, be depicted as the schematic diagram of current loop embodiment 1, guide roller 2 comprises guide roller 24 and lower steering roll 26, the positive pole of the pulse power 9 links to each other with lower steering roll 26 by brush or copper ring (not drawing among the figure), the negative pole of power supply 9 links to each other with bottom roll 5, and electric current flows to lower steering roll 26 from the positive pole of the pulse power 9, flows to metal material by lower steering roll 26, flow to bottom roll 5 through metal material, flowed back to the negative pole of the pulse power 9 again by bottom roll 5.Should guarantee this moment do not placing the situation lower steering roll of rolled piece, conduction roller, the roll shop building mutually insulated well and with ground insulate, in the present embodiment, roll, conduction roller and guide roller and corresponding bearing, and all carry out insulation processing between bearing and rolling-mill housing, thereby guarantee that electric current only passes through from rolled piece in the operation of rolling.Carry out insulation processing at roll and milling train speed changer connection, avoid high energy pulse current affects milling train operate as normal.
With reference to Fig. 6, be depicted as the schematic diagram of current loop embodiment 2, this embodiment is with embodiment difference shown in Figure 5: the both positive and negative polarity of the pulse power 9 links to each other with 5 with top and bottom rolls 4 respectively, electric current flows to bottom roll 5 by the positive pole of the pulse power 9, bottom roll 5 conveys electrical current to topping roll 4 through metal material, ultimate current flows back to the pulse power 9 negative poles, finishes the loop.Insulate between the upper and lower roll 4 and 5 this moment, and electric current only passes through from metal material.
The metal material that native system is preferably processed comprises metal and alloy thereof, band such as copper, magnesium alloy for example, and the width range of metal material is 10-800mm, thickness range is 0.1-4mm.
Claims (10)
1. metal Electroplastic asymmetrical rolling system comprises: a milling train, this milling train comprise and unreel device, coiler, and two groups of conduction rollers are arranged at the upper and lower rolls of these the two groups a pair of asynchronous rotations between the conduction roller and two pairs of guide rollers;
It is characterized in that: described topping roll, bottom roll and described two pairs of guide rollers all with the insulation of the supporter of described milling train;
This system further comprises a pulse power, the high energy pulse electric current of described pulse power output is input to the processing sections of the metal stocking of motion by described topping roll and bottom roll or by one of described bottom roll and described two pairs of guide rollers, and the processing sections of described metal stocking is by the rolling and asymmetrical rolling of described upper and lower roll realization Electroplastic of asynchronous rotation.
2. system according to claim 1, it is characterized in that also comprising a quenching unit, this quenching unit has cooling liquid bath, pump and is connected in two shower nozzles of this pump by conduit, these two shower nozzles are attached to the both sides of described roll, can respectively or carry out press quenching to described roll both sides metal material simultaneously and handle.
3. system according to claim 1 and 2 is characterized in that: the heater that described conduction roller, topping roll, bottom roll are set up respectively and described milling train heat is isolated, the heating-up temperature scope is 50-350 ℃.
4. system according to claim 1 and 2, it is characterized in that: described conduction roller comprises some roller bearings, and this roller bearing is in the cavity that heat insulation asbestos and refractory material surround, and establishes heater in this roller bearing, and the roller bearing heating-up temperature is 50-350 ℃.
5. system according to claim 4, it is characterized in that: described roller surface disposes wear-resisting, heat-resisting insulating ceramics coating.
6. system according to claim 1 is characterized in that: described guide roller is the pair of conductive wheel.
7. system according to claim 1, it is characterized in that: the described pulse power is exported unidirectional steep sharp wave, and its power is 10-40KW, and voltage magnitude is 10-300V, and pulse frequency is 1-3000Hz, pulse width is 20-5000 μ s.
8. system according to claim 1 is characterized in that: the friction speed of described upper and lower roll is than being 1:1-2:1, and the diameter of described upper and lower roll is identical, the rotating speed difference; Or described upper and lower roller diameter difference, rotating speed is identical.
9. system according to claim 1, it is characterized in that: the positive and negative output of the described pulse power connects described upper and lower roll respectively; Or the positive and negative output of the described pulse power connects respectively near described a pair of guide roller and the described bottom roll that unreels device.
10. system according to claim 1, it is characterized in that also comprising: place the screwdown gear of described roll, gather and record the roll-force data acquisition unit of pressure in real time, and invest the temperature data acquisition device that described roll both sides, collection and the described metal material of record are gone into roll and gone out roll.
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| CN 201320047891 CN203108932U (en) | 2013-01-29 | 2013-01-29 | Metal electricity-plasticity asymmetrical rolling system |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103846278A (en) * | 2014-01-14 | 2014-06-11 | 燕山大学 | Electroplastic equal-diameter rolling mill |
| CN105259048A (en) * | 2015-11-02 | 2016-01-20 | 上海交通大学 | Real-time detecting device and method applied to sheet three-point bending performance test |
| 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 |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
| CN108339852A (en) * | 2018-02-10 | 2018-07-31 | 太原理工大学 | A kind of milling method applying pulse current on roll |
| CN108356075A (en) * | 2018-02-10 | 2018-08-03 | 太原理工大学 | A kind of milling method being applied to pulse current on composite metal plate |
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| CN103846278A (en) * | 2014-01-14 | 2014-06-11 | 燕山大学 | Electroplastic equal-diameter rolling mill |
| CN103846278B (en) * | 2014-01-14 | 2015-09-16 | 燕山大学 | The isometrical rolling milling train of a kind of electro plasticity |
| CN105259048A (en) * | 2015-11-02 | 2016-01-20 | 上海交通大学 | Real-time detecting device and method applied to sheet three-point bending performance test |
| 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 |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
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| CN108356075A (en) * | 2018-02-10 | 2018-08-03 | 太原理工大学 | A kind of milling method being applied to pulse current on composite metal plate |
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