CN103952602A - Aluminum-titanium-boron production process - Google Patents
Aluminum-titanium-boron production process Download PDFInfo
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- CN103952602A CN103952602A CN201410180911.7A CN201410180911A CN103952602A CN 103952602 A CN103952602 A CN 103952602A CN 201410180911 A CN201410180911 A CN 201410180911A CN 103952602 A CN103952602 A CN 103952602A
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- furnace
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- reduction reaction
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- frequency conversion
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Abstract
The invention discloses an aluminum-titanium-boron production process, comprising the following steps: firstly, carrying out reduction reaction on raw materials in a reduction platform package, and stirring by adopting a stirrer according to the requirements in reduction reaction; carry out alloying operation in an inverter frequency furnace after reduction reaction is ended; finally processing alloy aluminum liquid in a continuous casting and rolling process through a crucible, so as to obtain an aluminum-titanium-boron product, wherein the crucible is a crucible discharging aluminum liquid from the bottom, the inverter frequency furnace is a coreless induction furnace, and the electromagnetic stirring force inside a hearth is proportional to specific power density of an electric furnace and inversely proportional to square root of work frequency. Reduction reaction is separated from the alloy operation, the problem that the temperature sharply changes and cannot be controlled due to a lot of heat generated in reduction reaction is avoided, meanwhile, the hold-up time of the crucible is reduced, and the capacity is improved. Discharge of the aluminum liquid from the crucible is changed into a bottom discharge method, and electromagnetic stirring generated by the inverter frequency furnace can be utilized to prevent participation of titanium element, and therefore no holding furnace or electromagnetic stirrer are needed and investment in equipment is reduced.
Description
Technical field
The invention belongs to metallurgical production technical field, relate to a kind of aluminium alloy production method, especially relate to a kind of aluminium titanium boron production technique.
Background technology
Al-Ti-B alloy is the most frequently used grain-refining agent of aluminium and aluminium alloy, adds in aluminium and aluminium alloy to base material refinement application and extensively in global aluminum casting industry to.Years of researches are found: the material that plays main refining effect in aluminium titanium boron wire is TiB2 and TiAl3, and Ti, B content and TiB2 and distribution, pattern and the size of this two-phase of TiAl3 in Al-Ti-B alloy in alloy, the grain refining capability of the Al-Ti-B alloy on effect grain-refining agent has direct impact.So how to ensure that in the production process of aluminium titanium boron accuracy, control TiB2 and distribution, pattern and the size of this two-phase of TiAl3 in Al-Ti-B alloy of composition just seem significant, whether can ensure aluminium titanium boron wire composition in process of production, the consistence of these two phases also determines the quality height of Al-Ti-B alloy silk simultaneously.
At present, domestic villiaumite method is one of the most frequently used and the most stable production technique of the preparation in Al-Ti-B alloy, and temperature of reaction in this technique, reaction times, time of repose, pouring temperature etc. are the main technologic parameters that aluminium titanium boron wire is produced, only have correct processing parameter and technique is accurately controlled to the aluminium titanium boron wire that just can produce high-quality.As shown in Figure 1, existing aluminium titanium boron production technique is: raw material is entered to main frequency furnace and carry out, after reduction reaction and alloy reaction, proceeding in the holding furnace of being furnished with magnetic stirrer simultaneously, after stirring is skimmed, enter continuous casting and rolling and form Al-Ti-B alloy line bar product.Adopt this processing method to carry out due to reduction reaction and alloying operation simultaneously, therefore have therefore characteristic simple to operate.But can produce a large amount of heats due to the work characteristics of main frequency furnace with in reduction reaction, can not be actual in the time of reduction reaction and alloying operation, can not realize the effective control to aluminium water whipping force and temperature; Therefore Al-Ti-B alloy product that can not production high-quality; On what simultaneously crucible went out that alloy aluminum hydromining uses in traditional technology is, go out method, and due to the strong precipitation threshold of titanium elements in Al-Ti-B alloy, so just have to increase holding furnace and magnetic stirrer, thereby input cost is increased.
Summary of the invention
For addressing the above problem, the invention provides a kind of aluminium titanium boron production technique.
The present invention is achieved by following technical solution.
A kind of aluminium titanium boron production technique, first enters raw material reduction Tai Baonei and carries out reduction reaction, and stir according to the agitator that need to adopt in reduction reaction; Reaction to be restored proceeds to after having carried out carries out alloying operation in frequency conversion furnace; Final alloy aluminium water enters casting and rolling process by crucible, obtains aluminium titanium boron finished product.
Described crucible goes out the crucible of aluminium water under adopting.
The coreless induction furnace that described frequency conversion furnace adopts, and electromagnetic stirring force in burner hearth is directly proportional to the specific power density of electric furnace, is inversely proportional to the square root of operating frequency.
The variable-frequency power sources of described frequency conversion furnace adopts three-phase full-wave controlled rectification.
In described reduction reaction, the stir shaft heat resisting temperature of agitator is more than 1000 DEG C.
The leading indicator of described frequency conversion furnace is: furnace volume is 2.0T; Power supply capacity is 630KVA; Frequency conversion primary voltage is three-phase 380V; Frequency conversion tank range of regulation is that 100～700V is adjustable continuously; Frequently scope is 40～60Hz; Rated output is 500KW; Inductor block voltage rating is 1350V; Alloying power is 2.0t/40min.
The casting of metals temperature of described crucible reaches more than 1400 DEG C.
The invention has the beneficial effects as follows:
The main frequency furnace of traditional technology is transformed into frequency conversion furnace by the present invention, for realizing the alloying of aluminium titanium boron molten metal, make stove and accessory have suitable temperature by configuring to realize in stove suitable power and suitable heat-up time, make has enough induction stirring abilities simultaneously in burner hearth molten metal.Compared with prior art, the present invention has following remarkable advantage:
(1) electromagnetic stirring force is adjustable: the electromagnetic stirring force in the coreless induction furnace thorax that frequency conversion furnace of the present invention adopts is directly proportional to the specific power density (total power/total volume) of electric furnace, is inversely proportional to the square root of operating frequency; That is to say, under the identical condition of furnace power, capacity (furnace power, capacity depend on throughput and processing parameter), suitably regulate operating frequency, just can regulate the induction stirring ability of burner hearth inner metal liquid;
(2) can realize pressure regulation Power Regulation and frequency modulation Power Regulation function: after burner hearth geometrical dimension, inductor block-furnace charge system design manufacture complete, main frequency furnace can only be realized pressure regulation Power Regulation, but for the molten aluminium stove of power frequency, life-time service can cause furnace wall alumina deposit, make furnace lining thickening, at this moment while sending maximum voltage, power is still less than normal, have to change furnace lining; But not being in the mood for stove and accessory, the frequency conversion adopting in technique of the present invention has pressure regulation Power Regulation and the dual Power Regulation effect of frequency modulation Power Regulation, when furnace wall alumina deposit makes furnace lining thickening, operating frequency can be suitably reduced, service rating can be improved, can effectively improve stove throughput, extend furnace lining work-ing life;
(3) the three-phase equilibrium link that does not need power frequency supply to be equipped with: variable-frequency power sources adopts three-phase full-wave controlled rectification, three-phase input current rigorous equilibrium, can save the three-phase equilibrium link of power frequency supply, saves investment, handled easily;
(4) due to reduction reaction and alloy operation are separated, avoid causing temperature acute variation uncontrollable owing to producing a large amount of heats in reduction reaction, reduced the holding time of crucible simultaneously, improve production capacity;
(5) change down method into owing to crucible being gone out to aluminium water, the induction stirring that can utilize frequency conversion furnace to produce prevents the precipitation of titanium elements, thereby does not need to newly increase holding furnace and magnetic stirrer, has reduced the input of equipment.
Brief description of the drawings
Fig. 1 is traditional aluminium titanium boron production technological process;
Fig. 2 is aluminium titanium boron production technological process of the present invention;
Fig. 3 is for adopting traditional processing technology to obtain the metallograph of aluminium titanium boron under 100X;
Fig. 4 is for adopting traditional processing technology to obtain the metallograph of aluminium titanium boron under 50X;
Fig. 5 obtains the metallograph of aluminium titanium boron under 100X for the described production technique of employing;
Fig. 6 obtains the metallograph of aluminium titanium boron under 50X for the described production technique of employing;
Fig. 7 is for adopting traditional processing technology refinement test chart;
Fig. 8 is the refinement test chart that adopts production technique of the present invention;
Fig. 9 is the actual use figure of aluminium bar that adopts system production technique to obtain;
Figure 10 is the actual use figure of aluminium bar that adopts production technique of the present invention to obtain.
Embodiment
Further describe technical scheme of the present invention below in conjunction with implementation column, but described in claimed scope is not limited to.
As shown in Figure 2, a kind of aluminium titanium boron production technique of the present invention, first enters raw material reduction Tai Baonei and carries out reduction reaction, and stir according to the agitator that need to adopt in reduction reaction; Reaction to be restored proceeds to after having carried out carries out alloying operation in frequency conversion furnace; Final alloy aluminium water enters casting and rolling process by crucible, obtains aluminium titanium boron finished product.
Described crucible goes out the crucible of aluminium water under adopting.
Adopt technique scheme, change original main frequency furnace into frequency conversion furnace, solve and in traditional technology, adopted main frequency furnace can not realize the problem of the effective control to aluminium water whipping force and temperature, adopted frequency conversion furnace to regulate the combination that realizes temperature and whipping force by the power frequency to equipment; Reduction reaction and alloy effect are separated, avoided causing temperature acute variation uncontrollable owing to producing a large amount of heats in reduction reaction, reduced the holding time of crucible simultaneously, improved production capacity; Crucible goes out aluminium water and changes down method into, and the induction stirring that can utilize frequency conversion furnace to produce prevents the precipitation of titanium elements, thereby does not need to newly increase holding furnace and magnetic stirrer, has reduced the input of equipment.
The main frequency furnace in traditional technology is transformed into frequency conversion furnace by the present invention, for realizing the alloying of aluminium titanium boron molten metal, in stove, must there is suitable temperature, this can be achieved by configuring suitable power and suitable heat-up time, but the more important thing is in burner hearth molten metal, must have enough induction stirring abilities, therefore, the technical program has been done following improvement to frequency conversion furnace:
For making electromagnetic stirring force adjustable: the coreless induction furnace that frequency conversion furnace in technique of the present invention adopts, and electromagnetic stirring force in burner hearth is directly proportional to the specific power density (total power/total volume) of electric furnace, is inversely proportional to the square root of operating frequency; That is to say, under the identical condition of furnace power, capacity (furnace power, capacity depend on throughput and processing parameter), suitably regulate operating frequency, just can regulate the induction stirring ability of burner hearth inner metal liquid.
After burner hearth geometrical dimension, inductor block-furnace charge system design manufacture complete, main frequency furnace can only be realized pressure regulation Power Regulation, but for the molten aluminium stove of power frequency, life-time service can cause furnace wall alumina deposit, make furnace lining thickening, while at this moment sending maximum voltage, power is still less than normal, have to change furnace lining.There are pressure regulation Power Regulation and the dual Power Regulation means of frequency modulation Power Regulation but stove and accessory is not in the mood in frequency conversion, when furnace wall alumina deposit makes furnace lining thickening, can suitably reduce operating frequency, can improve service rating, can effectively improve stove throughput, extend furnace lining work-ing life.
The variable-frequency power sources of described frequency conversion furnace adopts three-phase full-wave controlled rectification, and three-phase input current rigorous equilibrium can save the three-phase equilibrium link of power frequency supply, saves investment, handled easily.
In described reduction reaction, to have alkali resistance strong for agitator, can realize without hypervelocity; And the stir shaft heat resisting temperature of agitator is more than 1000 DEG C.
The leading indicator of described frequency conversion furnace is: furnace volume is 2.0T; Power supply capacity is 630KVA; Frequency conversion primary voltage is three-phase 380V; Frequency conversion tank range of regulation is that 100～700V is adjustable continuously; Frequently scope is 40～60Hz; Rated output is 500KW; Inductor block voltage rating is 1350V; Alloying power is 2.0t/40min.
Described crucible has the hot and oxidation-resistance of ultra-high conducting, and in chemically-resistant place, agent impact is outstanding, and physical strength is high, and erosion resistance is strong, and resistance to sudden heating is strong, and resistivity against fire is strong, and casting of metals temperature reaches more than 1400 DEG C
Experiment is found after deliberation, ensureing suitable power and suitable heat-up time in frequency conversion furnace in suitable temp by configuring, coil is the heart of coreless induction furnace, and ruhmkorff coil produces powerful magnetic field under the effect of electric current, and this magnetic field makes the metal in burner hearth produce eddy current and generate heat.By experimental study design repeatedly, result shows: adopt Special Main, sw cascaded structure, wherein main coil surrounds top and the middle part of silicon carbide crucible, and sw surrounds the bottom of silicon carbide crucible and goes out aluminium liquid pipe, can ensure stability and the product performance of significant parameter.
Can find out from Fig. 3, Fig. 4, the aluminium titanium boron metallographic structure maldistribution that adopts traditional technology to obtain, TiAl3 phase size is larger, and TiB2 assembles seriously mutually, and has salt and oxidation dirt settling;
Be not difficult to find out from Fig. 5, Fig. 6, adopt the aluminium titanium boron metallographic structure that technique of the present invention obtains to be evenly distributed, TiAl3 phase size reduces, and TiB2 assembles minimizing mutually, without salt and aluminum oxide dirt settling.
Be not difficult to find out from Fig. 7, Fig. 8, adopt traditional technology degree of refinement more coarse, adopt technique degree of refinement of the present invention thinner.
As shown in Figure 9, Figure 10, the aluminium bar product grains degree that adopts production traditional technology to obtain is 2 grades, and adopting the aluminium bar product grains degree that production technique of the present invention obtains is 1 grade.Process modification effect is better, reaches the requirement of YS/T447.1-2012.
Claims (7)
1. an aluminium titanium boron production technique, is characterized in that: first raw material is entered to reduction Tai Baonei and carry out reduction reaction, and stir according to the agitator that need to adopt in reduction reaction; Reaction to be restored proceeds to after having carried out carries out alloying operation in frequency conversion furnace; Final alloy aluminium water enters casting and rolling process by crucible, obtains aluminium titanium boron finished product.
2. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: described crucible goes out the crucible of aluminium water under adopting.
3. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: the coreless induction furnace that described frequency conversion furnace adopts, and electromagnetic stirring force in burner hearth is directly proportional to the specific power density of electric furnace, is inversely proportional to the square root of operating frequency.
4. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: the variable-frequency power sources of described frequency conversion furnace adopts three-phase full-wave controlled rectification.
5. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: in described reduction reaction, the stir shaft heat resisting temperature of agitator is more than 1000 DEG C.
6. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: the leading indicator of described frequency conversion furnace is: furnace volume is 2.0T; Power supply capacity is 630KVA; Frequency conversion primary voltage is three-phase 380V; Frequency conversion tank range of regulation is that 100～700V is adjustable continuously; Frequently scope is 40～60Hz; Rated output is 500KW; Inductor block voltage rating is 1350V; Alloying power is 2.0t/40min.
7. a kind of aluminium titanium boron production technique according to claim 1, is characterized in that: the casting of metals temperature of described crucible reaches more than 1400 DEG C.
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Cited By (1)
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| CN109694972A (en) * | 2019-03-11 | 2019-04-30 | 江苏华企铝业科技股份有限公司 | The high-densit aluminium titanium boron wire of high-purity and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109694972A (en) * | 2019-03-11 | 2019-04-30 | 江苏华企铝业科技股份有限公司 | The high-densit aluminium titanium boron wire of high-purity and its manufacturing method |
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