CN104439196A - Technology for refining solidification structure through consumable shear flow method and device thereof - Google Patents
Technology for refining solidification structure through consumable shear flow method and device thereof Download PDFInfo
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- CN104439196A CN104439196A CN201410689208.9A CN201410689208A CN104439196A CN 104439196 A CN104439196 A CN 104439196A CN 201410689208 A CN201410689208 A CN 201410689208A CN 104439196 A CN104439196 A CN 104439196A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
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Abstract
The invention discloses a technology for refining a solidification structure through a consumable shear flow method. The technology for refining the solidification structure through the consumable shear flow method is a melt processing method which increases the number of crystal nucleus, refines grains and uniformizes formations through a consumable shear flow, and used for the casting process of large ingot castings and continuous casting billets in large cross section sizes. During the solidification of metal bath, a high-speed motor is used for generating a high rotation speed, a strong shear flow is generated in a tiny gap between a consumable metal rotor component and a consumable metal stator component, the consumable metal rotor component and the consumable metal stator component efficiently generate a plurality of crystal nucleuses under the condition that liquid level stability is not affected in a controllable space, and 'crystal rain' effect is generated. In addition, stator consumable metal and rotor consumable metal move downwards under the drive of a screw, the consumable metal can be supplemented, the purposes of improving solidification speed, refining grains, increasing equiaxial crystal ratio and reducing solute segregation degree are ultimately achieved, and the alloy performance is improved. The invention further provides a consumable shear flow metal melt processing device. The consumable shear flow metal melt processing device comprises a shear consumable component fixing device, a shear consumable component driving device and shear consumable components made of consumable metal.
Description
Technical field
The present invention relates to a kind of molten metal treatment process and device, particularly relating to a kind of increases nucleus quantity by shearing consumable method, and the technique simultaneously stirred in controlled range molten metal and device thereof, be applied to metal freezing technical field.
Background technology
In machine-building, the application of cast steel is rather extensive.In recent years, along with the develop rapidly of modern industrial technology, maximization is the development trend that modern forging is produced, and obtain the large forgings that quality is good, intensity is high, size is large certainly will need to provide matter measured large-scale steel ingot.Therefore, the development of steel ingot is also along with the trend development maximized, and quality requirement is also more and more higher.Such as power is the nuclear power station low pressure rotor of 1300MW, needs to manufacture with the huge steel ingot of the 600t that weighs.The production technology of huge steel ingot is one of important symbol of the national heavy industry development level of measurement one and scientific and technological level.
Along with the increase of ingot shape size, the setting time of steel ingot increases greatly, setting rate reduces greatly, cause dendrite flourishing, component segregation, be mingled with, loosen, the defect such as shrinkage cavity is also often found, to scrapping of large-sized casting ingot be caused time serious, cause huge economic benefit and the loss of social benefit.And, once the defect in above-mentioned process of setting is formed, be difficult to adopt the method for follow-up diffusion annealing and forging to eliminate, and these defects also will bring huge potential safety hazard if do not eliminated, because large-scale steel ingot is often used for the core realms such as nuclear power, gas turbine, large-sized structural parts.In addition, in the casting process of iron and steel and nonferrous metallurgy, along with the increase of Cross Section of CC Billet size, liquid point depth also increases greatly, and therefore casting process faces the identical problem existed when large-scale steel ingot solidifies equally, causes continuous casting billet to there is above-mentioned defect equally.Therefore, how to solve the defect in large-sized casting ingot process of setting, become key issue in the urgent need to address now.As everyone knows, if can solidify the formation of dendrite inhibition in engineering at steel ingot or continuous casting billet, form the solidified structure of thin brilliant even equiax crystal, above-mentioned coagulation defect will alleviate greatly, eliminate even completely.For this reason, domestic and international researcher proposes multiple method around the grain refinement of large-scale steel ingot or continuous casting billet and Equiaxed grain crystallization, mainly contains: additional fining agent, the methods such as electromagnetism, ultrasonic wave or mechanical agitation.These methods to some extent solve the problems referred to above, but existence also all is more or less difficult to the defect avoided.During the fining agent of additional foreign material, need the strict addition controlling fining agent for reaching thinning effect preferably, and at some, higher field required to metal purity, foreign material fining agent add the pollution that also can cause metal; Also can see at present by adding thread, banded, pie or bar-shaped same metal to increase the method for nucleus quantity in coagulation system, but due to added metal easily exist fusing uneven, the nucleus problem pockety of new formation, limits the application of these class methods; Electromagnetic agitation has not directly with the advantage of frozen metal contact, avoid the pollution to frozen metal, but electromagnetic agitation also exists the problem of decay, and along with ingot casting or continuous casting billet sectional dimension increase, the effect of electromagnetic agitation reduces greatly.And for large steel ingot ingot mould used, because it has magnetic and wall thickness is very thick, even if employing extremely low frequency even D.C. magnetic field adopts high-power electromagnetic generator simultaneously, the molten steel that electromagnetic field almost can not penetrate in ingot mould is inner, cause electromagnetic agitation to have no effect, and the high energy consumption of electromagnetic mixing apparatus remain the difficult problem needing solution badly; Same ultrasonic wave stir also have that decay is serious, problem that guided wave bar and molten steel or aluminium alloy react, common churned mechanically agitator then can be subject to the corrosion of metal bath, cause agitator shorter for service life, the corrosion of agitator simultaneously also can cause the pollution of metal, and inappropriate mixing speed also can cause the harm such as slag.To sum up, a kind of more effective mode is still needed to solve the coagulation defect problem of band large-scale metal ingot casting and heavy in section continuous casting billet at present.
Summary of the invention
In order to solve prior art problem, the object of the invention is to the deficiency overcoming prior art existence, a kind of technique and device thereof of consumable shear flow method thinning solidification structure are provided, by Strong shear mobilization fusing same metal to form mass efficient forming core particle efficiently, reach crystal grain thinning tissue, obtain full equiaxed grain structure, make the more uniform object of tissue and composition, the follow-up forging rolling of final simplification and heat treatment step, improve the performance of material.
Create object for reaching foregoing invention, the present invention conceives as follows:
The present invention has carried out the control to metal solidification process by the additional effective forming core particle of consumable shear flow acquisition.First, additional forming core particle is obtained by the Strong shear fusing of same metal, be applied to ingot casting or under draw continuous casting billet top, the nucleus formed causes the effect of " crystalline rain " under gravity, broken under the effect that the dendrite simultaneously formed in metallic solution flow at Strong shear, thus in metal bath, form a large amount of effective forming core particles, the greatly nucleation rate of molten metal in raising ingot mould or crystallizer, make solidified structure obtain refinement, proportion of equiaxed grain increases; Secondly, the forming core particle obtained after using same metal fusing avoids additional nucleating agent or inovulant to the pollution of original metal, ensure that the pure of final ingot casting metal; Again, Strong shear stirring power in the controlled range that ingot top center applies regulates the temperature of inside ingot to a certain extent, even each Elemental redistribution, reduce the temperature at ingot casting center, reduce thermograde and the concentration gradient of whole ingot casting, under identical cooling condition, extend nucleus formation time in molten metal, be formed with the condition being beneficial to equiax crystal and being formed.
Therefore, by the additional effective forming core particle of consumable shear flow, can crystal grain significantly in thinning metal solidification texture, increase the uniformity of tissue, improve the equiaxial crystal ratio of ingot casting, and reduce component segregation, and then significantly promote the microstructure and composition uniformity of large-sized casting ingot or heavy in section continuous casting billet, thus improve its comprehensive mechanics and physical property.
According to foregoing invention design, the present invention adopts following technical proposals:
A kind of technique of consumable shear flow method thinning solidification structure, when metal freezing, by with ingot casting or under draw continuous casting billet the consumable metal stator module made of same metal and consumable metal rotor assembly be combined to form and shear consumable assembly, shearing consumable assembly is in inert gas environment all the time, in metal bath, control to shear the degree of depth that consumable assembly immerses molten metal, and by controlling the high speed relative motion between consumable metal stator module and consumable metal rotor assembly, ingot casting or under draw continuous casting billet top central area, liquid cave produce Strong shear flowing, the shearing consumable components constantly immersing molten metal is melted gradually, thus ingot casting or under draw in the liquid cave of continuous casting billet and introduce additional forming core particle, simultaneously under the effect of shearing the Strong shear flowing that consumable assembly produces, the dendrite formed in metallic solution is broken, from and metal bath, form effective forming core particle, in molten metal cave, under gravity continuous uniform decline additional forming core particle and broken dendrite be mutually mixed to form a large amount of nucleus particle, metal solidification texture is made to obtain refinement.Consumable metal introduces the forming core particle that can form heterogeneous forming core in a large number under Strong shear effect in metal bath, and makes it to be uniformly distributed.Two tubulose consumable structures design in relative rotation and Strong shear are acted in controlled range play certain stirring action, reduce the thermograde in forward position, solidification of metal melt interface under the prerequisite ensureing liquid level stabilizing; Consumable metal constantly supplements, and have adjusted ingot casting liquid heart temperature to a certain extent, improving uniformity of melt temperature on a macroscopic scale.The final nucleation rate greatly improved in metal solidification process, the large ingot casting of refinement or continuous casting and solidifying organize crystal grain, make metal solidification texture to full Equiaxed grain crystallization future development, and regulate and control being uniformly distributed of solute element.Rotor consumable metal and stator consumable metal and metal bath to be dealt with are the metal of composition of the same race, can not introduce exogenous impurity, ensure that the pure of metal.In the present invention, cooling rate cast iron mold faster preferentially selected by casting ingot mould, adopts air cooling or water-cooling pattern cooling, to ensure to reduce the remelting of nucleus after treatment to metal bath.The nucleus quantity that the present invention adopts consumable shear flow method to increase in molten metal carrys out thinning solidification structure, is applicable to being applied in bottom pouring cast and continuous casting.
As the preferred technical scheme of the present invention, in metal bath, relatively rotated by the high speed controlled between consumable metal stator module and consumable metal rotor assembly, ingot casting or under draw continuous casting billet top central area, liquid cave produce Strong shear flowing, consumable metal stator module and consumable metal rotor assembly are two the combined casing shape assemblies keeping coaxial rotation, control to shear the degree of depth that molten metal is immersed in consumable assembly end by elevating drive mechanism.
As the present invention's preferred technical scheme further, the working method that consumable metal rotor assembly adopts periodic reverse to rotate, produces the shear flow of periodic reverse, refinement dendrite and forming core better in ingot casting or the inner liquid cave of continuous casting billet.
As the further optimal technical scheme of technique scheme of the present invention, when solidification of metal melt, consumable metal stator module and consumable metal rotor assembly be 3-10cm below immersed in liquid level all, with assurance device neither slag, also mass efficient forming core particle can be formed fast at whole inside ingot, and complete timer at metal freezing and can exit firm ingot mould or crystallizer smoothly, the rotating speed controlling consumable metal rotor assembly is the adjustable rotating speed of 3000-10000r/min, consumable metal rotor assembly high-speed rotation is directly driven by high-speed motor, consumable metal stator module itself does not rotate, with ensure itself and consumable metal rotor assembly have high relatively rotate speed while consumable metal rotor assembly high-speed rotation is produced stirring action occur in controlled range, at the same time, slow-speed motor and corresponding transmission mechanism drive and comprise itself and high-speed motor, consumable metal stator module, consumable metal rotor assembly declines with the speed of 1-100mm/min at interior each assembly, realizing the severity control to shearing consumable assembly immersion molten metal, making consumable metal constantly in molten metal, supplement additional forming core particle.
As the further optimal technical scheme of technique scheme of the present invention, be applied to the casting process of the large-scale die casting ingot casting of cast iron, cast steel, non-ferrous metal or its alloy; And be applied to the casting process of square billet, circle base.
As the further optimal technical scheme of technique scheme of the present invention, when solidification of metal melt, die casting ingot casting weight is 10t-600t, and the continuous casting square billet cross section length of side is 0.2-0.6m, and continuous cast round billets diameter is 0.2-1m.
A kind of consumable shear flow metal bath treating apparatus implementing the technique of consumable shear flow method thinning solidification structure of the present invention, by shearing consumable component fixing device, shear the shearing consumable assembly composition of consumable assembly drive means and consumable metal making, shear consumable assembly to be made up of consumable metal stator module and consumable metal rotor assembly, consumable metal stator module and consumable metal rotor assembly are for keeping coaxial two combined casing shape assemblies in relative rotation, shearing consumable component fixing device is mutually permanently connected by upper bracket and lower case and forms, shearing consumable component sealing is installed in lower case, with top all openings bottom lower case, the bottom opening of lower case fixedly mounts a tubbiness refractory material protection overcoat, make refractory material protect overcoat immerse ingot casting or under draw in the molten metal cave melt at continuous casting billet top, lower case is provided with pore, pore is communicated with inert gas conduit, shearing consumable assembly is in inert gas environment all the time, at lower case internal fixtion, stator lifting guide pillar is installed, stator lifting guide pillar is provided with lifting carriage plate, lifting carriage plate is fixedly connected with consumable metal stator module, lifting carriage plate moves formation sliding pair along stator lifting guide pillar, thus the axial elevating movement direction controlling consumable metal stator module is parallel with the axis of stator lifting guide pillar, shear consumable assembly drive means to be made up of rotor drive and lowering or hoisting gear, rotor drive is made up of high-speed motor and electric-motor drive bar, electric-motor drive bar adopts movable sealing component through the open top of lower case, the rotation output of electric-motor drive bar is fixedly connected with consumable metal stator module, lifting carriage plate is rotationally connected with electric-motor drive bar by rotary limited is secondary, lifting displacement between rotary limited pair constraint electric-motor drive bar and lifting carriage plate, thus make consumable metal stator module and consumable metal rotor assembly synchronization lifting, high-speed motor is by drive motor drive rod rotation, and then drive consumable metal rotor assembly to rotate, shear consumable assembly lowering or hoisting gear to be made up of slow-speed motor and elevating drive mechanism, be straight line lifting displacement movement by the rotational transform of slow-speed motor by elevating drive mechanism, and then the refractory material protection overcoat that the shearing consumable assembly driving consumable metal to make is connected by the bottom of lower case carries out elevating movement.
The external diameter of above-mentioned consumable metal stator module and consumable metal rotor assembly is preferably 8-500mm and 10-513mm respectively, and wall thickness is preferably 1-20mm, between clearance distance be preferably 1-5mm.Thinner tube wall can ensure that consumable metal is formed under the effect of shear flow and form effective forming core particle more efficiently, and between high rotating speed and stator consumable metal rotor consumable metal, less gap then ensure that and can form more powerful shear flow.
Preferred above-mentioned slow-speed motor is fixedly connected with the shell of high-speed motor, in shearing consumable assembly lowering or hoisting gear, elevating drive mechanism preferably adopts screw mechanism, slow-speed motor by driving the nut of screw mechanism along guide rod shaft to lifting moving, and then drives high-speed motor to carry out elevating movement.
The same metal pipe that above-mentioned consumable metal stator module and consumable metal rotor assembly preferably adopt tradition casting or mechanical processing technique to produce, or preferably adopt same metal or alloy powder sintered after metal tube.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
1. the metal that the present invention produces due to additional consumable metal and casting is same metal, therefore can not introduce other impurity, avoids producing the pollution to metal;
2. the present invention adopts mechanical high-speed rotation, rotating in same direction or the counter-rotational working method of periodicity can be adopted, strong shear action is produced between rotor consumable metal and stator consumable metal, mass efficient forming core particle can be produced fast, and make it to be uniformly distributed, there is high efficiency;
3. the present invention to occur between the stator and the rotor and rotor stator is not the design of paddle chip due to Strong shear, therefore, although this device rotor has high rotating speed, but only can produce controlled local strong flows at ingot casting center, can not affect the stable of liquid level, this is particularly important in die casting and continuous casting are produced;
4. what the present invention changed consumable metal adds the effect that speed also has the liquid heart temperature regulated in casting process, homogeneous temperature field;
5. present invention process and device can effectively carry heavy alloyed equiaxial crystal ratio, refinement casting blank crystal grains, uniform formation's grain size.Improve production efficiency, improve product quality, simplify following process, effectively save production cost;
6. present invention process and device produce field of flow in the mode of mechanical shearing, and plant bulk design comparison is flexible, can not there is the problem that length of penetration is less, energy consumption is large as electromagnetic agitation due to the decay of electromagnetic field.
Accompanying drawing explanation
Fig. 1 be preferred embodiment of the present invention consumable shear flow metal bath treating apparatus structural representation.
Fig. 2 is the consumable shear flow crystal grain thinning technology mechanism figure along the profile of A-A line and partial enlargement in Fig. 1.
Detailed description of the invention
Details are as follows for the preferred embodiments of the present invention:
In the present embodiment, see Fig. 1 and Fig. 2, a kind of consumable shear flow metal bath treating apparatus, by shearing consumable component fixing device, shear the shearing consumable assembly composition of consumable assembly drive means and consumable metal making, shear consumable assembly to be made up of consumable metal stator module 11 and consumable metal rotor assembly 10, consumable metal stator module 11 and consumable metal rotor assembly 10 are two the combined casing shape assemblies keeping coaxial rotation, shearing consumable component fixing device is mutually permanently connected by upper bracket and lower case 7 and forms, shearing consumable component sealing is installed in lower case 7, with top all openings bottom lower case 7, the bottom opening of lower case 7 fixedly mounts a tubbiness refractory material protection overcoat 12, make refractory material protect overcoat 12 immerse ingot casting or under draw in the molten metal cave melt at continuous casting billet top, lower case 7 is provided with pore 6, pore 6 is communicated with inert gas conduit 4, shearing consumable assembly is in inert gas environment all the time, at lower case 7 internal fixtion, stator lifting guide pillar 8 is installed, stator lifting guide pillar 8 is provided with lifting carriage plate 9, lifting carriage plate 9 is fixedly connected with consumable metal stator module 11, lifting carriage plate 9 moves formation sliding pair along stator lifting guide pillar 8, thus the axial elevating movement direction controlling consumable metal stator module 11 is parallel with the axis of stator lifting guide pillar 8, shear consumable assembly drive means to be made up of rotor drive and shearing consumable assembly lowering or hoisting gear, rotor drive is made up of high-speed motor 2 and electric-motor drive bar 5, electric-motor drive bar 5 adopts movable sealing component through the open top of lower case 7, the rotation output of electric-motor drive bar 5 is fixedly connected with consumable metal stator module 11, lifting carriage plate 9 is rotationally connected with electric-motor drive bar 5 by rotary limited is secondary, lifting displacement between rotary limited pair constraint electric-motor drive bar 5 and lifting carriage plate 9, thus make consumable metal stator module 11 and consumable metal rotor assembly 10 synchronization lifting, high-speed motor 2 is rotated by drive motor drive link 5, and then drive consumable metal rotor assembly 10 to rotate, shear consumable assembly lowering or hoisting gear to be made up of slow-speed motor 1 and elevating drive mechanism, be straight line lifting displacement movement by the rotational transform of slow-speed motor 1 by elevating drive mechanism, and then the refractory material protection overcoat 12 that the shearing consumable assembly driving consumable metal to make is connected by the bottom of lower case 7 carries out elevating movement.
In the present embodiment, see Fig. 1, slow-speed motor 1 is fixedly connected with the shell of high-speed motor 2, in shearing consumable assembly lowering or hoisting gear, elevating drive mechanism is screw mechanism, slow-speed motor 1 by driving the nut of screw mechanism along the axial lifting moving of guide rod 3, and then drives high-speed motor 2 to carry out elevating movement.
In the present embodiment, see Fig. 1 and Fig. 2, when metal freezing, adopt steel grade be medium carbon structural alloy steel 34CrMo1A, technological process be electric furnace smelting-LF stove refining-VD degassed-die casting-rolling.The controlling unit of the present embodiment is die casting link, and adopt air cast, the prismatic of steel ingot is 8 ribs, and its liquidus temperature is 1503 DEG C, and solidus temperature is 1024 DEG C.The pouring temperature of steel ingot 1550 DEG C, the initial temperature of ingot mould 14 and ingot mould base 16 is 400 DEG C, and ingot mould 14 ratio of height to diameter is 1.33, ingot casting height 2100mm.The pouring temperature of molten steel is 1550 DEG C, the cast of bet method is adopted during cast, molten steel enters in ingot mould by running channel 17, poring rate is 1m/min, ingot quality is 30t, adopt the exothermic mixture 13 of insulated feeder and thickness 50mm to be suitably incubated for ingot casting, guaranteeing can not rapid solidification at the metal of this device of use to the starting stage rising head place of the process of metal bath.Ingot mould adopts air cooling mode to cool.When casting completes, by the present embodiment device as on the support above ingot mould, refractory material protection overcoat 12 adopts corundum material to make, the degree of depth that adjusting device immerses molten metal makes refractory material protect overcoat 12 to immerse below metal bath surface 5cm, device and exothermic mixture 13 liquid level form the space of relative closure, argon gas protection is filled with in device, regulate high-speed motor 2 rotating speed to 5000r/min, 3mm gap is kept between stator consumable metal stator module 11 and consumable metal rotor assembly 10, pipe thickness 11mm, external diameter is respectively 200mm and 187mm, the speed of moving downward is 20mm/min, processing time 20min, the working method that high-speed motor 2 adopts periodic reverse to rotate, every 15s Rotation With Changing is to once.Remove treating apparatus after metal bath is disposed, ingot casting naturally cools under air cooling condition.
The present embodiment is when solidification of metal melt, the high speed shear flowing utilizing turbulent flow I violent between consumable metal stator module 11 and consumable metal rotor assembly 10 to cause and consumable metal rotor assembly 10 manage the shear flow in the interior shear flow in middle v ' direction and the v direction of consumable metal stator module 11 outside, produce a large amount of Broken Crystal, become effective forming core particle of metal bath, thus the forming core speed greatly improved in metal bath, produce a large amount of nucleus at short notice, realize thinning solidification structure 15 and Equiaxed grain crystallization, reduce the target of segregation degree, and then raising alloy property, simplify subsequent production technique.
In the present embodiment, high speed electric 2 machine drives consumable metal rotor assembly 10 to rotate, produce the shearing rate more than 20000/s, the great turbulence level of high Reynolds number is produced between consumable metal stator module 11 and the minimum gap 3mm of consumable metal rotor assembly 10, thus formation has the shear flow that there is strong shearing force in a fluid, strong shearing is produced under the effect that consumable metal stator module 11 and consumable metal rotor assembly 10 flow at Strong shear, wash away, broken, the effect of mixing, produce Broken Crystal tiny in a large number, and be mixed in metal bath under the effect that Action of Gravity Field and stirring flow, become effective forming core particle of metal freezing, high-speed motor 2 moves downward with certain speed 20mm/min by slow-speed motor 1 and transmission mechanism together with consumable metal stator module 11 and consumable metal rotor assembly 10 simultaneously, constantly supplement the consumption of added metal, a large amount of effective forming core particles is constantly provided before cast metals is solidified.The refractory material be connected with lower case 7 outside consumable metal stator module 11 with consumable metal rotor assembly 10 protects overcoat 12 also to immerse in molten metal, play airtight effect, be filled with argon gas in lower case 7 inside, prevent at high temperature consumable metal stator module 11 and consumable metal rotor assembly 10 from oxidative phenomena occurring; Simultaneously refractory material protection overcoat 12 and consumable metal stator module 11 and the consumable metal rotor assembly 10 of corundum form the flow region of a controlled gentleness; the nucleus formed can be uniformly distributed in metal bath, and the liquid level during simultaneously making ingot solidification is in metastable state.
In the present embodiment, see Fig. 1 and Fig. 2, consumable metal stator module 11 and the thinner tube wall of consumable metal rotor assembly 10 can ensure that consumable metal is formed under the effect of shear flow and form effective forming core particle more efficiently, and high high-speed motor 2 rotating speed and gap less between consumable metal stator module 11 and consumable metal rotor assembly 10 then ensure that and can form more powerful shear flow.
In the present embodiment, see Fig. 1 and Fig. 2, increased the solution processing method of nucleus quantity, crystal grain thinning, uniform formation by consumable shear flow, for the casting process of large ingot casting and heavy in section size continuous casting billet.When solidification of metal melt, high-speed motor 2 is utilized to produce high rotating speed, strong shear flow is produced between the micro gap between consumable metal stator module 11 and consumable metal rotor assembly 10, thus in controlled space, consume stators and rotators metal when not affecting liquid level stabilizing and produce a large amount of nucleus efficiently, produce " crystalline rain " effect, stator consumable metal and rotor consumable metal move downward under the drive of screw rod simultaneously, consumable metal is supplemented, finally reach raising setting rate, crystal grain thinning, improve equiaxial crystal ratio, reduce the target of solute segregation degree, and then raising alloy property.
By reference to the accompanying drawings the embodiment of the present invention is illustrated above; but the invention is not restricted to above-described embodiment; multiple change can also be made according to the object of innovation and creation of the present invention; change, the modification made under all Spirit Essences according to technical solution of the present invention and principle, substitute, combination, to simplify; all should be the substitute mode of equivalence; as long as goal of the invention according to the invention; only otherwise deviate from the technique of consumable shear flow method thinning solidification structure of the present invention and the know-why of device thereof and inventive concept, all protection scope of the present invention is belonged to.
Claims (10)
1. the technique of a consumable shear flow method thinning solidification structure, it is characterized in that: when metal freezing, by with ingot casting or under draw continuous casting billet the consumable metal stator module made of same metal and consumable metal rotor assembly be combined to form and shear consumable assembly, described shearing consumable assembly is in inert gas environment all the time, in metal bath, control to shear the degree of depth that consumable assembly immerses molten metal, and by controlling the high speed relative motion between consumable metal stator module and consumable metal rotor assembly, ingot casting or under draw continuous casting billet top central area, liquid cave produce Strong shear flowing, the shearing consumable components constantly immersing molten metal is melted gradually, thus ingot casting or under draw in the liquid cave of continuous casting billet and introduce additional forming core particle, simultaneously under the effect of shearing the Strong shear flowing that consumable assembly produces, also make the dendrite that formed in metallic solution broken, from and effective forming core particle of being formed metal bath, in molten metal cave, under gravity continuous uniform decline additional forming core particle and broken dendrite be mutually mixed to form a large amount of nucleus particle, metal solidification texture is made to obtain refinement.
2. the technique of consumable shear flow method thinning solidification structure according to claim 1, it is characterized in that: in metal bath, relatively rotated by the high speed controlled between consumable metal stator module and consumable metal rotor assembly, ingot casting or under draw continuous casting billet top central area, liquid cave produce Strong shear flowing, described consumable metal stator module and consumable metal rotor assembly are two the combined casing shape assemblies keeping coaxial rotation, control to shear the degree of depth that molten metal is immersed in consumable assembly end by elevating drive mechanism.
3. the technique of consumable shear flow method thinning solidification structure according to claim 2, is characterized in that: the working method that consumable metal rotor assembly adopts periodic reverse to rotate, and produces the shear flow of periodic reverse in ingot casting or the inner liquid cave of continuous casting billet.
4. according to the technique of consumable shear flow method thinning solidification structure described in any one in claims 1 to 3, it is characterized in that: when solidification of metal melt, consumable metal stator module and consumable metal rotor assembly be 3-10cm below immersed in liquid level all, the rotating speed controlling consumable metal rotor assembly is 3000-10000r/min, consumable metal rotor assembly is driven to rotate by motor by transmission mechanism, keep in relative rotation simultaneously at consumable metal stator module and consumable metal rotor assembly, also control whole shearing consumable assembly with the decrease speed of 1-100mm/min, realize the severity control to shearing consumable assembly immersion molten metal, consumable metal is made constantly in molten metal, to supplement additional forming core particle.
5., according to the technique of consumable shear flow method thinning solidification structure described in any one in claims 1 to 3, it is characterized in that: the casting process being applied to the large-scale die casting ingot casting of cast iron, cast steel, non-ferrous metal or its alloy; And be applied to the casting process of square billet, circle base.
6. the technique of consumable shear flow method thinning solidification structure according to claim 5, it is characterized in that: when solidification of metal melt, die casting ingot casting weight is 10t-600t, and the continuous casting square billet cross section length of side is 0.2-0.6m, and continuous cast round billets diameter is 0.2-1m.
7. one kind implements the claims the consumable shear flow metal bath treating apparatus of the technique of consumable shear flow method thinning solidification structure described in 1, by shearing consumable component fixing device, shear the shearing consumable assembly composition of consumable assembly drive means and consumable metal manufacture, it is characterized in that: described shearing consumable assembly is made up of consumable metal stator module (11) and consumable metal rotor assembly (10), described consumable metal stator module (11) and described consumable metal rotor assembly (10) are two the combined casing shape assemblies keeping coaxial rotation, described shearing consumable component fixing device is mutually permanently connected by upper bracket and lower case (7) and forms, described shearing consumable component sealing is installed in described lower case (7), described lower case (7) bottom and top all openings, the bottom opening of described lower case (7) fixedly mounts tubbiness refractory material protection overcoat (12), make described refractory material protect overcoat (12) immerse ingot casting or under draw in the molten metal cave melt at continuous casting billet top, described lower case (7) is provided with pore (6), described pore (6) is communicated with inert gas conduit (4), described shearing consumable assembly is in inert gas environment all the time, at lower case (7) internal fixtion, stator lifting guide pillar (8) is installed, described stator lifting guide pillar (8) is provided with lifting carriage plate (9), described lifting carriage plate (9) is fixedly connected with described consumable metal stator module (11), described lifting carriage plate (9) forms sliding pair along described stator lifting guide pillar (8) is mobile, thus the axial elevating movement direction controlling described consumable metal stator module (11) is parallel with the axis of described stator lifting guide pillar (8), described shearing consumable assembly drive means is made up of rotor drive and shearing consumable assembly lowering or hoisting gear, described rotor drive is made up of high-speed motor (2) and electric-motor drive bar (5), described electric-motor drive bar (5) adopts movable sealing component through the open top of described lower case (7), the rotation output of described electric-motor drive bar (5) is fixedly connected with described consumable metal stator module (11), described lifting carriage plate (9) is rotationally connected with described electric-motor drive bar (5) by rotary limited is secondary, lifting displacement between the described rotary limited pair described electric-motor drive bar (5) of constraint and described lifting carriage plate (9), thus make described consumable metal stator module (11) and described consumable metal rotor assembly (10) synchronization lifting, described high-speed motor (2) is by driving the rotation of described electric-motor drive bar (5), and then drive described consumable metal rotor assembly (10) to rotate, described shearing consumable assembly lowering or hoisting gear is made up of slow-speed motor (1) and elevating drive mechanism, be straight line lifting displacement movement by the rotational transform of described slow-speed motor (1) by described elevating drive mechanism, and then refractory material protection overcoat (12) driving described shearing consumable assembly to be connected by the bottom of described lower case (7) carries out elevating movement.
8. consumable shear flow metal bath treating apparatus according to claim 7, it is characterized in that: the external diameter of described consumable metal stator module (11) and described consumable metal rotor assembly (10) is respectively 8-500mm and 10-513mm, wall thickness is 1-20mm, between clearance distance be 1-5mm.
9. consumable shear flow metal bath treating apparatus according to claim 7 or 8, it is characterized in that: described slow-speed motor (1) is fixedly connected with the shell of described high-speed motor (2), in described shearing consumable assembly lowering or hoisting gear, described elevating drive mechanism is screw mechanism, described slow-speed motor (1) by driving the nut of described screw mechanism along guide rod (3) axial lifting moving, and then drives described high-speed motor (2) to carry out elevating movement.
10. consumable shear flow metal bath treating apparatus according to claim 7 or 8, it is characterized in that: the same metal pipe that described consumable metal stator module (11) and described consumable metal rotor assembly (10) adopt tradition casting or mechanical processing technique to produce, or adopt same metal or alloy powder sintered after metal tube.
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| CN113976851A (en) * | 2021-10-29 | 2022-01-28 | 金雅豪精密金属科技（深圳）股份有限公司 | Semi-solid pulping machine and semi-solid pulping die-casting system |
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| CN104439196B (en) | 2016-08-17 |
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