CN1214970A - Non-ferrous molten metal thermal mould flow pouring-magnetic suspension cooling-waste heat hot-rolling blank-making technology - Google Patents

Abstract

The present invention relates to a continuous casting and tandem rolling process for making non-ferrous slab and strip plate (or wirebar) and providing them for cold-finish rolling (or drawing) to make them into finished products. It is characterized by that the molten metal flows out from pouring nozzle of the holding furnace, and made into molten metal sheet or wire, then the molten metal sheet or wire is suspended in the mid-air by means of magnetic suspension force produced by electric magnet, and is cooled under the controllable condition and made into solid state, and under the condition of keeping upper limit of hot-rolling temp. of said designation, the above-mentioned material is fed into hot mill, and hot-rolled,then cooled, and its micro-oxide layer is removed by polishing machine, the bright strip plate can be coiled by coiling machine (or shear stocker), then can be provided for cold-finish rolling to obtain the finished product.

Description

Non-ferrous molten metal thermal mould flow pouring-magnet suspension temperature reducing-waste heat hot-rolling blank-making technology

The invention belongs to the non-ferrous metal manufacture field.

The present invention is the continuous casting and rolling blank-making technology.

Non-ferrous metal (comprising all nonmagnetic metal such as copper) strip material, the main production process of wire rod are melting → casting → cogging → cold rolling (or stretching) → heat treatment → shearing operations such as (or finishing).

By the trade mark of producing non-ferrous metal plate band, wire rod, with corresponding non-ferrous metal raw material, drop into smelting furnace and be smelted into qualified molten metal, the casting technology that the ECDC symbol requires is cast as base, carries out pressure processing then and becomes a useful person.(annotating 1) (annotating 2) (annotating 3)

The first step that pressure processing is become a useful person is cogging, and cogging divides two kinds of hot rolling cogging and cold rolling coggings.Then strip blank (or line base) being handed over cold finish rolling (or cold stretch) to continue pressure processing is finished product.

Know that from above-mentioned the base of global up to now non-ferrous metal strip blank (or line base) all is to be carried out separately respectively by casting, cogging two big operations.

The present invention will cast, cogging two big operations are merged into a step and carried out.The advantage of existing hot-die casting (annotating 2) and electromagnetic casting (annotating 3) has again and utilizes streamer molten metal waste heat to carry out the characteristics of hot rolling cogging.Formation will must be modified into the blank that a procedure provides cold finish rolling (or cold stretch) by ten multiple working procedures now after founding.Thereby save a large amount of energy consumptions, material consumption and investment.

Operation principle of the present invention as shown in drawings, for must be in controlled compression ring border the non-ferrous metal kind and the various trade mark of streamer, must be added with the protective device of protective atmosphere in addition, this paper slightly.

This paper is primarily aimed at the strip material and sets forth, and to suitable fully on the wire rod principle, must make corresponding changes to equipment, and this paper also omits.

Press the non-ferrous metal plate band trade mark, 1. the molten metal that melting is qualified is poured in the holding furnace molten bath 2..After insulation reaches pouring temperature, to fill in carry on holding in both hands 3. with chute 4. taper hole form conical ring gap, garden, utilize the static pressure of liquation in the stream malleability of molten metal and the molten bath, force molten metal 5. to flow out from flat pouring nozzle, form the molten metal sheet 6., 7. the magnetic suspension force that produced by electromagnet is floating to be held in the palm in the air, 8. cooled off by controlled cooling device becomes solid-state flat made-up belt, and keep its temperature to reach the hot rolling ceiling temperature of this trade mark, by initial towing plate 9., by being mainly hot-rolling mill tractive force, traction is gone into hot-rolling mill and is 10. carried out hot rolling.Strip blank after the hot rolling is done the processing of rubbing down light by controlled cooling device (11) and rubbing down ray machine (12) again, removes the low-level oxidation layer and reaches the metal true qualities.Batch rolling by coiling machine (the sheet material base is for shearing stacker) (13) at last, cooling finish rolling (or stretching) is finished product.Existing division is as follows:

1, being poured into holding furnace molten metal 2. must be qualified.And eliminate and pour into the harmful effect that brings.

2, holding furnace structure and every technical parameter 2. must meet the technological requirement of the trade mark of producing, and must there be roller the body of heater lower end and places on the track, does to advance, retreat, and can tighten in orbit.Can adapt to the different trades mark like this, the different size technological parameter is adjusted.

3,3. Sai Feng starts to control the preparing metal liquid flow production can normally be carried out, and machine driving must be arranged, electronic and electric control gear, and 3. make has the function that reaches small quantity (as 0.1mm) lifting up and down flexibly.Molten metal through chute 4., pouring nozzle is when 5. slabbing flows out, and is must its discharge of control consistent with technological design, promptly consistent with output, suspending power, cooling capacity, hot-rolling mill hot rolling linear velocity.Flow is excessive, becomes to gush, and production can't be carried out; Too smallly can not be full of pouring nozzle, cause thickness low LCL or hole recessed, become waste product.

4,4. chute is embedded in the molten metal for a long time, and available graphite or refractory material are made.

5, pouring nozzle 5. can with 4. separate manufacturing, then with the combination of high temperature sizing.The 5. available anti-oxidant graphite manufacturing of pouring nozzle, and the end face that contacts with air is done protection handle, to prolong its service life.

Pouring nozzle is port of export cross dimensions 5., must meet user's order, hot-rolling mill specification and manufacturing technique requirent.As being the web-like band of H62 0.3mm * 310mm to ordering goods, hot-rolling mill roll roll surface is wide to be 800mm, and then port of export section 5. is that 3～4mm * 640mm is advisable.

6, after molten metal flows out pouring nozzle, become the molten metal sheet 6., held in the palm in the air by magnetic suspension force is floating,, become solid-stately by liquid state, and keep this trade mark hot-rolled temperature upper limit at once by controlled cooling.Mainly be under the effect of hot-rolling mill tractive force, be pulled and enter hot-rolling mill and 10. carry out hot rolling.

7,6. held in the palm in the air by electromagnet magnetic suspension force 7. is floating by the molten metal sheet that 5. flows out, 8. done controlled cooling, become solid-state by liquid state by controlled cooling.

According to electromagnetic coupling theory, magnetic suspension train (annotating 4) and LIM principle, 7. electromagnet of the present invention is equivalent to the monolateral stator of synchronous linear electric motor (annotating 5), and 6. red-hot of metal is the non magnetic sheet rotor (annotating 6) of synchronous linear electric motor.

From annotating 5, annotate 6 and know, after electromagnet passes to DC current, just produce suspending power and hold in the palm in aerial and 10. move the molten metal sheet is 6. floating to hot-rolling mill.6. floating holder height is advisable with 20mm and is consistent with the hot rolling centre-height.

To maglev lateral thrust, adopt two groups of electromagnetism electricity iron arranged side by side, two groups of coils oppositely advance electricity each other, and each is organized the lateral thrust that electromagnet produces and cancels each other.Eliminate lateral thrust like this molten metal sheet is pushed away rolling centerline, hot rolling can't be carried out.

The electromagnet magnetic line of force 7. has the limit end effect in limit, two ends portion, adds cartridge plate (14) at both ends 7. to isolate its influence.

Because each trade mark hot rolling ceiling temperature difference, molten metal chip size difference (promptly varying in weight), the size of the magnetic suspension force that must use are also different, so dc source should be able to be regulated power output.Put into practice (annotating 7) (annotating 8) according to China's magnetic suspension train design, debugging and operation, when hoverheight is 10～20mm, suspends 1 kilogram weight and need 12～16 watts of electrical power, just can determine the power bracket of adjustable dc source.For example to H623mm * 640mm section sheet metal, when length was 1 meter, sheet metal heavily was 16～17kg, and then dc source power should be 272 watts.Select power output from 50 watts to 2 kilowatts adjustable dc source.

When the different trades mark, it is that cooling zone length is also different identical that the sheet metal of different size is suspended in the aerial time that needs to cool off, electromagnet must be made the single 100mm to 200mm of being about for this reason, wide for being slightly less than the wide single electromagnet of 1/2 molten metal sheet, be arranged into two row, every row are connected several, both can offset lateral thrust, can form the magnetic suspension space of different length again, satisfy production requirement.

Electromagnet 7. can vertically be provided with (as shown in drawings) but also horizontally set.

Can place a foil of fire-resistant material under the sheet metal, so that adjust temporarily.

The design of electromagnet is undertaken by relevant design theory and practical experience, does not belong to this paper scope.

8,8. available water fog cooling or water spray cooling of controlled cooling.But must regulate flexible, convenient and stable.

9, initial towing plate 9. wide the and thick size of section all should export the little 0.3mm of wide and thick size of section than pouring nozzle so that insert pouring nozzle.Insert front end wide to the side saw three mark of mouth teeth so that involve molten metal.9. material with identical being advisable of the trade mark of producing product.9. towing plate in the accompanying drawing has finished the traction task, changes ordinary production over to, and 9. this towing plate has been rolled over and removed, and accompanying drawing still indicates its initial distracted position by initial traction state.

10, hot-rolling mill specification 10. is according to products scheme and rolling therory and decide, for H62 0.3 * 310mm winding, then the hot-rolling mill specification is chosen as two roller hot-rolling mill Φ 400 * 800, and 180 tons of roll-forces, roll line speed are that 30m/min～the 300m/min continuous stepless is adjustable.Its hot rolling working modulus is more than 40%.To the H62 of thick 3mm, through working modulus the volume base that becomes thick 1.8mm after 40% the hot rolling, cooling finish rolling is finished product.

11, to the different trades mark, the process for cooling after its hot rolling is widely different.Adopt controlled cooling (11) to reach technological requirement.Comprising water squeezing drying unit to wet base behind the water spray chilling.

12, the hot rolling base is made rubbing down light through rubbing down ray machine (12) after controlled cooling reaches room temperature, removes the low-level oxidation layer, is the metal polish true qualities, becomes bright made-up belt and hands over cold finish rolling (or stretching).At controlled cooling (11) and rubbing down ray machine (12) and rubbing down ray machine (12) and batch between the machine of getting (13) and all the kink frame can be set, be convenient to operation and accent machine.

13, the hot-rolled billet that is bright true qualities behind rubbing down light batches a rolling (slab then piles piece by shearing stacker) by coiling machine (13) and hands over cold finish rolling (or stretching) to be finished product.

The present invention has following advantage.

1, improves the blank quality and adopt the blank of the present invention's production to have gaps such as surperficial flawless, inner no deviation and anti-deviation, can become high-quality base cooling finish rolling (or stretching) through hot rolling, rubbing down.

2, reducing huge capital expenditure is example with the copper coin band, and China has and introduces external main equipment tame year ends 80 and build up and produce 1.2 ten thousand tons of copper strips factories per year.About 5 to 600,000,000 yuan of RMB is amounted in its gross investment now.From two/the last one that provides the capital expenditure of this section of blank production procedure to be generally fully invested for cold finish rolling is provided, promptly 2.5 to more than 300,000,000.Adopt the present invention to build up the factory of same specification, be not higher than 0.5 hundred million yuan, can save huge investment from being casted into to cold finish rolling provides the capital expenditure of this section of blank production procedure.

3, saving energy consumption is example with the copper coin band, at home, abroad, be this section of cold finish rolling (or stretching) confession base operation from being casted into, all must through strand, heating and ten multi-pass hot rollings, mill face, roughing, in roll and several times intermediate annealing and pickling or 10 multi-pass cold cogging and intermediate annealings, could be that cold finish rolling is for base.In general the energy consumption of this section operation accounts for about 60% of full product energy consumption, is example by domestic advanced copper strip energy consumption index 2000kWh/ ton product, the energy consumption of this section operation be 1200kWh/ ton product.The energy consumption of this section of the present invention operation is not higher than 200kWh/ ton finished product, produces 200000 tons of strip materials per year with China and estimates that year energy-conservation 200,000,000 kWh are worth more than 200,000,000 yuan.

4, reducing producing cost is example with the copper coin band, with ten multi-pass castings, heating, hot rolling, mill face, roughing, intermediate annealing, pickling or casting, cold cogging, intermediate annealing is merged into together and is finished, reduce raw material, auxiliary material, accessory and manpower consumption significantly, improve lumber recovery, give meter product per ton and can reduce by 1000 yuan of producing costs.The whole nation is produced 200000 tons of copper coin bands per year and just can be saved more than 200,000,000 yuan and many raw metals.

5, reduce big non-ferrous metal strip wire production difficulty of chill property and producing cost along with hard-core technology and the high-tech development of national defence, use the material of various chill property big (big more many) in a large number than copper alloy.By existing production technology production, be hard on very much, not only operation is many, energy consumption is high, technological requirement is harsh, and lumber recovery is low, and expense and consumption are all high.Adopt the present invention then can significantly reduce production difficulty and producing cost.

6, the present invention is advanced in the world.Be used to produce the back and improve the scientific and technological level that China's raw material are produced.

Claims (1)

1. Non-ferrous metal (comprising all nonmagnetic metal such as copper) strip material blank and non-ferrous metal wire rod blank adopt liquation hot-die streamer, hold in the palm in the space by controlled cooling by magnetic suspension force is floating, utilize its waste heat hot-rolling base.

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