CN208066938U - Strip on-line heating device when a kind of magnesium alloy rolling - Google Patents

Abstract

The utility model discloses strip on-line heating devices when a kind of magnesium alloy rolling, including induction heating apparatus, gas-operated thermal bath facility and infrared radiation thermometer mounted on magnesium alloy rolling entrance and exit, infrared radiation thermometer for monitoring the online temperature of magnesium alloy in real time, it is connected with the control system of induction heating apparatus, gas-operated thermal bath facility, by setting target temperature come the entire heating system of closed-loop control, induction heating apparatus uses Frequency Induction Heating mode, including the furnace body of converter plant, sensing heating and vermicularizing control device；Gas-operated thermal bath facility includes combustion chamber, sparking electrode, sparking control system and sub-cylinder, and the furnace body of sensing heating and the combustion chamber of gas heating are distributed up and down, and magnesium alloy board to be rolled is rolled among the two across and into roll.The utility model can be fast and efficiently by the control of magnesium alloy temperature within best rolling temperature range, while can improve the temperature uniformity of magnesium alloy board to be rolled, achievees the purpose that plate form control.

Description

Strip on-line heating device when a kind of magnesium alloy rolling

Technical field

The utility model is related to the molding process unit of rolling magnesium alloy sheet, strip when specifically a kind of magnesium alloy rolling On-line heating device.

Background technology

Magnesium alloy is metal most light in structural material, be gradually applied in recent years aerospace, defence and military, The fields such as automobile, telecommunications, while requirement of these fields to its performance and efficiency is also being continuously improved.Traditional casting magnesium Alloy cannot be satisfied requirement gradually, and have more by the wrought magnesium alloy product of the technique productions such as extruding, forging, rolling High intensity, better ductility, more diversified mechanical property.Wherein, important hand of the rolling as magnesium alloy plastic processing Section has obtained significant progress.

Magnesium alloy is close-packed hexagonal structure, especially its axis ratio c/a=1.624, close to ideal axis ratio c/a=1.63, Therefore polycrystalline magnesium alloy can only be generally plastically deformed by basal slip and twin, and independent slip-system is few, at room temperature Plastic deformation is mainly executed by two independent slip systems on basal plane, and according to Von Mises criterions, general polycrystal material Material, which at least wants 5 independent slip systems to start, could carry out stable plastic deformation.At room temperature, slip coefficient on magnesium alloy basal plane Mesh far can not meet the requirement of Von Mises criterions, so the magnesium alloy scarce capacity of intercrystalline compatibility of deformation under external force, Deformation is difficult at room temperature, plasticity, poor toughness.

Deformation temperature is the key factor for the plastic deformation ability for influencing magnesium alloy, and temperature is higher than 225 DEG C, non-basal slip System starts required critical resolved shear stress and substantially reduces, thus faceted pebble and the conical surface can be activated to slide, and it is apparent that this makes magnesium alloy present Ductility transition, plasticity significantly improves.On the other hand, the solid molding of magnesium alloy is complicated pyroplastic deformability's mistake Dynamic recrystallization occurs during high temperature deformation for journey, magnesium alloy, and recrystallization, which produces new crystal grain, makes material refine, while disappearing again The distortion energy generated in deformation is consumed, these substantially improve the further deformability of magnesium alloy, pass through crystal grain refinement, deformation In the process in addition to crystal grain deforms and elongates, it also occur that significant Grain Boundary Sliding, rotation and rotation, to which plasticity carries significantly Height, or even obtain superplasticity.It can be seen that selecting rational thermomechanical parameter, refinement recrystal grain has magnesium alloy rolling Important meaning.

To very temperature sensitive, Plastic Forming temperature range is relatively narrow for magnesium alloy Plastic Forming, generally at 300~450 DEG C Section in, when forming temperature is low, the deformation energy force difference of magnesium alloy is also easy to produce cold crack；When the temperature is excessively high, certain in alloy A little low melting points may mutually melt during forming, fire check is also easy to produce under stress, in addition, forming temperature is excessively high The coarse grains that can cause part microscopic structure directly affect the performance of material military service.

Electromagnetic induction heating technology is a kind of novel heating technique, relies on high frequency alternating current induced field, and high Frequency alternating magnetic field generates the mechanism of vortex to realize the rapid fever of workpiece, to achieve the purpose that heating in workpiece again.With The advantages that traditional contact heating is compared, induction heating apparatus, safe and reliable, environmentally friendly, energy saving, efficient, intelligent controllability Make its be widely used in aerospace, automobile making, non-ferrous metals casting, metal surface each neck such as quenching and tempering Domain.

One coil is passed into alternating current, alternating magnetic field will be generated around coil, if again by a conductor (workpiece) It is placed in the alternating magnetic field, then will generate induced current in conductor, faradic frequency is identical as the frequency of electric current in coil. Since part itself has impedance, when have electric current by when will give off heat, so when sensing heating part be rely on its from The induced current (vortex) that circulates in body generates heat and is heated.But it will produce " collection skin " when passing through alternating current in conductor Effect makes being unevenly distributed for electric current on section, i.e. the current density on surface layer is big, and the current density of center portion is small, and this Degree of irregularity increases with the increase of source current frequency.

According to the difference of induction heating power power frequency, sensing heating can be divided into low frequency induction heating, Medium frequency induction Heating, superaudio sensing heating, high-frequency induction heating, hyperfrequency sensing heating, with the raising of source current frequency, the efficiency of heating surface It improves but heating layer depth reduces.

In sensing heating, because the distribution situation of " collection skin " effect and vortex knows that the skin temperature highest of plate-type work is inside The auxiliary mode of heating of diminuendo, substantially heat transfer as board-like inside.Secondly precisely due to coil topology structure and magnetic field Distribution error can not possibly the temperature of plate face every bit be caused all to be balanced, therefore this just need by auxiliary heat transfer side Formula solves to allow the skin temperature of plate-type work to reach harmonious distribution in the range of error allows.

Sensing heating " closes on " effect for the interaction that effect refers between the conducting wire for passing to different current directions, can Influence magnitude of field intensity.Plate-type work and induction coil gap are small, then approach effect is apparent, far then opposite.The two is closer, by The right-hand rule knows that the two magnetic vector superposition is bigger, then the vortex incuded is also bigger.The two then can be ignored more than a determining deviation faces Nearly effect, this improves theoretical reference when designing induction coil spacing and with plate-type work spacing.

In electromagnetic induction heating system, it is numerous to influence electromagnetism, the parameter factors of magnetic-thermo coupling.Including driving frequency Rate, loop construction, coil current density, winding inductance quantity, magnetic field intensity, leakage field, coil and induction workpiece spacing, workpiece itself Relative permeability, resistance coefficient, the kelvin effect of coil and workpiece and dialysis depth, outside air be to its thermal convection current etc. Factor.Therefore in actual sensed heating system, numerous parameters restrict the efficiency and effect of electromagnetic induction heating.Numerous parameters In, to the maximum parameter of the influential effect of electromagnetism thermal coupling be between alternating current frequency, loop construction, coil and workpiece between Away from, current density and magnetic field intensity.

Burner is that the device for making fuel and air spray mixed firinor fuel burning in a certain way is referred to as.According to primary air type Burner can be divided into diffusion flame burner, atmospheric burner, full premixed burner.Wherein, diffusion flame burner is pressed The power supplied according to air needed for burning can be divided into natural induced draft formula and forced-air blast formula again, natural induced draft formula diffusion burner according to By nature draft, by diffusion supply air, be chiefly used in it is civilian, forced-air blast formula then rely on air blower supply air, be mostly used In industry；The burner designed according to partly-premixed combustion method is known as atmospheric combustion device, combustion gas under a certain pressure, with certain Speed is sprayed from nozzle, primary air is sucked from primary air mouth by the ejector action that combustion gas kinetic energy generates, in injector Combustion gas is mixed with primary air, is flowed out and is burnt through head fire hole, can be divided into low-pressure injection formula according to gas pressure intensity and high pressure is drawn Penetrate formula；Full premixed burner is the burner designed according to fully premixed method, and combustion gas is made fully to be pre-mixed with air, It burns again through the ejection of burner fire hole, has the characteristics that flame is short, burning calorific intensity is big, ignition temperature is high.

Temperature must reach a certain range, but the uniformity of magnesium alloy board temperature to be rolled simultaneously when magnesium alloy board rolls Also it must be strictly controlled, temperature unevenness can make magnesium alloy board when rolling the flatness defects such as side wave, middle wave, both sides of the chest wave occur, Cause plank rolling failure.Since the heat loss speed of roll and magnesium plate different parts has difference, plank is locally added Heat just becomes the emphasis of magnesium plate rolling.

Currently, the control of temperature has become very urgent task when to magnesium alloy rolling.

Utility model content

To solve above-mentioned defect in the prior art, strip adds online when the utility model provides a kind of magnesium alloy rolling Thermal can quickly, efficiently promote magnesium alloy board temperature by the control of magnesium alloy temperature within best rolling temperature range, together When the present apparatus can also improve the temperature uniformity of magnesium alloy board to be rolled, play the purpose of control template.

The purpose of this utility model is achieved through the following technical solutions：

Strip on-line heating device when a kind of magnesium alloy rolling, the heating device are located at before milling train between two memorial archways, including Induction heating apparatus, gas-operated thermal bath facility and the infrared radiation thermometer mounted on magnesium alloy rolling entrance and exit, it is described red Outer temperature measurer is connected for monitoring the online temperature of magnesium alloy in real time with the control system of induction heating apparatus, gas-operated thermal bath facility It connects, by setting target temperature come the entire heating system of closed-loop control, the induction heating apparatus uses Frequency Induction Heating side Formula, including the furnace body of converter plant, sensing heating and vermicularizing control device, the converter plant include power supply coupling module and electricity Magnetic coupling module, the electromagnetic coupling module are located above roll line, and the gas-operated thermal bath facility includes combustion chamber, sparking electricity Pole, sparking control system and sub-cylinder, combustion gas enter combustion chamber by sub-cylinder, and it is big to carry out ventilatory capacity by control system of striking sparks Small control, sparking electrode are located in combustion chamber, are wrapped up by refractory ceramics, and both sides electrode leads to burning by long leg ceramics package Outdoor with the control line of sparking control system outside combustion chamber to connect, and the combustion chamber is located at below roll line, magnesium to be rolled Alloy is rolled after the two joint heating into roll.The furnace body of sensing heating and the combustion chamber of gas heating are divided up and down Cloth, magnesium alloy board to be rolled are rolled among the two across and into roll.

Preferably, the induction coil topological structure of the electromagnetic coupling module is rectangle.

Preferably, the electromagnetic coupling module is moved up and down by hydraulic cylinder or motor drive.

Preferably, several burner arrangements are the lattice structure of m rows n row, and combustion gas enters each stone or metal plate for standing a stove on as a precaution against fire by sub-cylinder 7.

Preferably, the combustion chamber includes the body structure connected and composed by fixture by upper cover and main body, the babinet knot It is equipped with several burners in structure, and sparking electrode is equipped on each burner.

Preferably, upper cover selection be magnetic, be wear-resisting, heat safe martensitic stain less steel, and be distributed on upper lid numerous Small sircle hole.

Preferably, main body selection be magnetic, be corrosion-resistant, heat safe ferrite or ferrite-austenite stainless Steel, and several horizontal, vertical reinforcing ribs intersected are disposed with above main body, lower raft is made of the larger n row steel plates of spacing.

Preferably, the burner 12 uses partly-premixed or full premixed burner, the injector shape of burner For " inverted L " type, primary air air inlet is located at except combustion chamber, while the nozzle of the burner is flat flame nozzle.

Compared with prior art, the utility model has the advantages that：

1) the heating sensing heating and flame of creativeness is united and applied in magnesium alloy plate heating, conveniently, safely, efficiently Realize industrial magnesium alloys strip reversible rolling；

2) by carrying out differential heating to magnesium alloy board different zones to be rolled, reach the mesh by temperature control panel type 's；

3) from the basic theories such as " kelvin effect " of sensing heating, " approach effect ", it is proposed that induction coil rectangle Topological structure and induction coil elevating mechanism；

4) influence of the material electromagnetic inductance to sensing heating efficiency is considered, to gas heating combustion chamber each section material Matter, which proposes, to be distinctly claimed；

5) angularly consider from mechanics, burning, optimize the specific mechanical structure of combustion chamber babinet；

6) burner keeps burning abundant, safe using most rational construction and combustion system；

7) by selecting the auxiliary equipment such as suitable sparking mode, controller, alarm to keep ignition security controllable；

8) it is more to possess regulation power, adjusting induction heater and magnesium alloy board to be rolled distance, regulating gas amount size etc. Kind adjusts the measure of heating speed；

9) system easily can realize temperature automation control by infrared radiation thermometer.

Description of the drawings

The structural schematic diagram of strip on-line heating device when Fig. 1 is the utility model embodiment magnesium alloy rolling；

Fig. 2 is the rectangle topology induction coil layout plan view in the utility model embodiment；

Fig. 3 is the explosive view of flame gas heating device combustion chamber in the utility model embodiment.

Fig. 4 is the structural schematic diagram of certain satisfactory burner in the utility model embodiment.

Fig. 5 is the structural schematic diagram of nozzle in Fig. 4.

Fig. 6 is the sparking electrode tomograph in the utility model embodiment.

Specific implementation mode

The utility model is described in detail with reference to specific embodiment.Following embodiment will be helpful to this field Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability For the those of ordinary skill in domain, without departing from the concept of the premise utility, various modifications and improvements can be made. These belong to the scope of protection of the utility model.

As shown in figs 1 to 6, strip on-line heating device when the utility model embodiment provides a kind of magnesium alloy rolling, The heating device is located at before milling train between two memorial archways, including induction heating apparatus, gas-operated thermal bath facility and is mounted on magnesium alloy The infrared radiation thermometer of entrance and exit is rolled, the infrared radiation thermometer for monitoring the online temperature of magnesium alloy in real time, with induction Heating device, gas-operated thermal bath facility control system be connected, by setting target temperature come the entire heating system of closed-loop control, It is 1 that the heating power supply frequency of the induction heating apparatus, which selects intermediate frequency (2.5~10kHZ), corresponding magnesium alloy plate tape thickness to be rolled, ~8mm.According to sensing heating knowledge, the more high then corresponding heating thickness of supply frequency is smaller, can be according to strip during use Thickness suitably adjusts supply frequency, adjusts heating amount additionally by control induction heating power watt level, the induction adds Thermal includes converter plant, the furnace body of sensing heating and vermicularizing control device, and the converter plant includes power supply coupling module 3 With electromagnetic coupling module 2, the electromagnetic coupling module 2 is located above roll line, the gas-operated thermal bath facility include combustion chamber 5, Sparking electrode 11, sparking control system 6 and sub-cylinder 7, combustion gas enter combustion chamber 5 by sub-cylinder 7, pass through control of striking sparks and are System 6 carries out the control of ventilatory capacity size, and sparking electrode 11 is located in combustion chamber, is wrapped up by refractory ceramics, both sides electrode is grown Leg ceramics package leads to be connected outside combustion chamber with the control line of sparking control system 6 outside combustion chamber, the combustion chamber 5 Below roll line, magnesium alloy to be rolled is rolled after the two joint heating into roll.The furnace body of sensing heating and combustion The combustion chamber of gas heating is distributed up and down, and magnesium alloy board to be rolled is rolled among the two across and into roll.The electricity The induction coil topological structure of magnetic coupling module 2 is rectangle, can avoid the intermediate dead-time problem of round or ellipse topological structure, Improve the uniformity of magnesium plate temperature simultaneously.The electromagnetic coupling module 2 is moved up and down by hydraulic cylinder or motor drive, The distance between induction coil and magnesium plate are controlled, to make full use of the approach effect of electromagnetic induction, control heating speed and efficiency, Adjusting the power supply coupling module of sensing heating simultaneously makes its inverter be operated in resonant condition, keeps system power dissipation minimum.Another party The elevating function in face, furnace body can facilitate on-site maintenance, can timely processing when there is problems in asymmetic rolling.Several burner arrangements are m rows n The lattice structure of row, particular number can arrange that burner individually controls, it can be achieved that being closed to magnesium in combustion chamber according to actual conditions The purpose for improving temperature while controlling template plays in the local warming of golden plate band, since magnesium alloy and roll edge heat dissipation are very fast, Therefore usually the gas output of edge burner in combustion chamber is improved and is slightly larger than intermediate combustion device, combustion gas is entered by sub-cylinder 7 Each stone or metal plate for standing a stove on as a precaution against fire.

The combustion chamber 5 includes the body structure connected and composed by fixture 10 by upper cover 8 and main body 9, the body structure It is interior to be equipped with several burners 12, and sparking electrode 11 is equipped on each burner 12, burner is by gas pipeline and divides gas Cylinder is connected, and sparking electrode is connected by high pressure resistant control line with control cabinet.The selection of the upper cover 8 is magnetic, is wear-resisting, is heat safe Martensitic stain less steel, and numerous small sircle holes are distributed in upper cover 8.The selection of the main body 9 is magnetic, is corrosion-resistant, heat safe iron is plain Body or ferrite-austenitic stainless steel, and the top of main body 9 is disposed with several horizontal, vertical reinforcing ribs intersected, lower raft by It is constituted away from larger n row steel plates.High temperature resistant makes combustion chamber apply the long period under thermal stress ringing, and combustion chamber uses magnetic Property material the magnetic flux of magnesium alloy board to be heated can be improved, improve the efficiency of heating surface, in addition combustion chamber upper surface is often closed with magnesium The contact friction of golden plate band, wear-resisting property are preferable.The burner 12 uses partly-premixed or full premixed burner, combustion 14 shape of injector of burner is " inverted L " type, and primary air air inlet 15 is located at except combustion chamber, and so can guarantee has abundance Primary air supply, while the occurrence of vertically avoid burner backfire with the injector on ground；In addition the burner Nozzle 13 be flat flame nozzle, along with the effect of cover board keeps gas heating more equal in the case where ensureing the efficiency of heating surface It is even, while open fire being avoided to directly heat phenomenon on fire caused by magnesium alloy edge burr.

Embodiment

Assuming that magnesium alloy plate geometric dimension to be rolled 1600 × 4mm, gait of march 1000mm/min, by on-line heating device Temperature is increased to 220 DEG C by 100 DEG C afterwards, illustrates the utility model below by specific specification of equipment model and operating procedure Design and application method.

Sensing device use thyristor type intermediate frequency induction heating device, frequency converter model GPS/500/1S, use pressure for 0.1~0.2MPa water-cooling patterns cool down, and inductor is using tablet multiple field and increases magnet yoke device inside it, and loop construction is shown in Fig. 2, inductor geometric dimension 1900*750*400, power supply maximum power 800kW.Inductor heating furnace body uses 20mm phenolic aldehyde Glass filament plate is nonmagnetic, there is hook gear thereon, and the lead screw of the rectangular thread of two diameter 40mm of connection, is used in combination one above the babinet Motor drives the nut rotation with lead screw cooperation by turbine and worm retarder, final to realize moving up and down for induction-box；Flame gas Heating uses natural gas, gas pressure intensity 4000pa, natural gas to be connected respectively at burner by sub-cylinder, and burner uses head Portion is the structure of porous plate-like, and mixing tube specification 50 × 400mm of Φ of inverted L shape injector, burner tip 17 is with secondary sky Gas air inlet 19, while each nozzle 17 all carries several gas outlets 18, export direction tends to be horizontal, when installation adjustment fire The air regulating board 16 of burner arrives rational position.Ignition controller uses YHG-103 type ignition controllers, ignition voltage reachable 1.6kV, entire gas pipeline is using the pipeline connection of 1/2 inch of caliber, and sparking electrode is as shown in Figure 6.Flame heating equipment fires Room 1800 × 1300 × 260mm of specification is burnt, both ends, which are bolted, to be fixed on mill housing, and 4 are evenly arranged in combustion chamber × 4=16 sets of burners of row of row, burner is apart from upper cover plate distance 180mm.With drawing between the cover board and main body of combustion chamber babinet Button fixture is connected, and concrete structure is shown in Fig. 3 shown in 10.The cover board that flame gas heats combustion chamber babinet uses 12Cr12 type geneva Body stainless steel, main part use 10Cr17 ferrite stainless heat resisting steel.By the stove of intermediate frequency induction heating device after type selecting The combustion chamber of body and flame gas heating device is mounted on magnesium alloy board inlet to be rolled in two memorial archway of milling train, and will be corresponding mating Auxiliary equipment is positioned over suitable position around milling train.By the probe placement of two high-performance infrared radiation thermometers before magnesium alloy rolling Rear entrance, exit, and display device is placed on rational position.

Frequency Induction Heating, each burner of gas heating are opened successively when the present embodiment works, observe magnesium alloy board The front and back temperature of rolling, set after sensing heating frequency by adjust the heating power of Medium frequency induction, sensing heating furnace body height, Gas heating air inflow size controls magnesium alloy board temperature to be rolled, while observing template and pass through local directed complete set combustor air inlet Size is measured to control template, middle column combustor air inlet amount is reduced when there is middle wave, occurs firing two sides when the wave of side Burner air inflow reduces.

Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office It is limited to above-mentioned particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, This has no effect on the substantive content of the utility model.

Claims (8)

1. strip on-line heating device when a kind of magnesium alloy rolling, which is located at before milling train between two memorial archways, feature It is：Including induction heating apparatus, gas-operated thermal bath facility and infrared measurement of temperature mounted on magnesium alloy rolling entrance and exit Instrument, the infrared radiation thermometer for monitoring the online temperature of magnesium alloy, the control with induction heating apparatus, gas-operated thermal bath facility in real time System is connected, and by setting target temperature come the entire heating system of closed-loop control, the induction heating apparatus uses intermediate frequency sense It includes power supply coupling to answer mode of heating, including the furnace body of converter plant, sensing heating and vermicularizing control device, the converter plant Module (3) and electromagnetic coupling module (2), the electromagnetic coupling module (2) are located above roll line, the gas-operated thermal bath facility packet Combustion chamber (5), sparking electrode (11), sparking control system (6) and sub-cylinder (7) are included, combustion gas is entered by sub-cylinder (7) burns Room (5) carries out the control of ventilatory capacity size by control system (6) of striking sparks, and sparking electrode (11) is located in combustion chamber, by resistance to height Warm ceramics package, both sides electrode are led to outside combustion chamber by long leg ceramics package to exist with the control line of sparking control system (6) Connected outside combustion chamber, the combustion chamber (5) is located at below roll line, magnesium alloy to be rolled after the two joint heating into roll into Row rolling, the furnace body of sensing heating and the combustion chamber of gas heating are distributed up and down, and magnesium alloy board to be rolled passes through among the two And it is rolled into roll.

2. strip on-line heating device when a kind of magnesium alloy rolling as described in claim 1, it is characterised in that：The electromagnetism coupling The induction coil topological structure for molding block (2) is rectangle.

3. strip on-line heating device when a kind of magnesium alloy rolling as described in claim 1, it is characterised in that：The electromagnetism coupling Molding block (2) is moved up and down by hydraulic cylinder or motor drive.

4. strip on-line heating device when a kind of magnesium alloy rolling as described in claim 1, it is characterised in that：Several burners It is arranged as the lattice structure of m rows n row, combustion gas enters each stone or metal plate for standing a stove on as a precaution against fire by sub-cylinder (7).

5. strip on-line heating device when a kind of magnesium alloy rolling as described in claim 1, it is characterised in that：The combustion chamber (5) include the body structure connected and composed by fixture (10) by upper cover (8) and main body (9), be equipped in the body structure several Burner (12), and it is equipped with sparking electrode (11) on each burner (12).

6. strip on-line heating device when a kind of magnesium alloy rolling as claimed in claim 5, it is characterised in that：The upper cover (8) select be magnetic, be wear-resisting, heat safe martensitic stain less steel, and be distributed numerous small sircle holes in upper cover (8).

7. strip on-line heating device when a kind of magnesium alloy rolling as claimed in claim 5, it is characterised in that：The main body (9) select be magnetic, be corrosion-resistant, heat safe ferrite or ferrite-austenitic stainless steel, and be disposed with above main body (9) Several horizontal, vertical reinforcing ribs intersected, lower raft are made of the larger n row steel plates of spacing.

8. strip on-line heating device when a kind of magnesium alloy rolling as claimed in claim 5, it is characterised in that：The burner (12) partly-premixed or full premixed burner is used, the injector shape of burner is " inverted L " type, primary air air inlet Except combustion chamber, while the nozzle of the burner is flat flame nozzle.