CN86107702A - Microcrystal casting method and device thereof - Google Patents
Microcrystal casting method and device thereof Download PDFInfo
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- CN86107702A CN86107702A CN 86107702 CN86107702A CN86107702A CN 86107702 A CN86107702 A CN 86107702A CN 86107702 CN86107702 CN 86107702 CN 86107702 A CN86107702 A CN 86107702A CN 86107702 A CN86107702 A CN 86107702A
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Abstract
The invention provides a kind of method and apparatus that liquid steel (or other metal alloy) is rapidly solidificated into ingot (base).It is characterized in that liquid steel (or other metal, alloy) injected with water-cooled and have in the divergent contour multistage crystallizer of pouring into a mould slag, carry out rapid solidification when under inside and outside power effect, forming a large amount of crystallites, improving the poring rate and the quality of steel thus, is a kind of method of crystallite cast.Its multistage crystallizer is by changeover portion, and typing section and gripping section are formed, and it is fast that it has setting rate, and the bleed-out accident is few, flexible operation, and safe and reliable advantage can be produced various cross dimensions, and composition is even, compact structure, isotropic steel ingot (base).
Description
The present invention relates to a kind of smelting the method and apparatus that qualified liquid steel (or other metal, alloy) carries out the rapid solidification casting.
In smeltery now, a large amount of qualified liquid steel provided (or other metal, alloy) is provided in the stokehold must casting ingot-forming (base), and its process and device have ingot mould cast and two kinds of forms of continuous pouring.Yet there is following several problem:
The die casting equipment turnaround time long, the plant and equipment occupancy is big, consumes highly, and continuous casting steel billet thickness and section are little, the multi-stream casting operating difficulties.Therefore can not cooperate with mammoth conveter well and carry out high efficiency, the production of many kinds.
2. the mass ratio of continuous casting billet and ingot casting does not have great difference, but after increasing the section of steel billet, the internal nonuniformity defective of steel trend is serious.Setting rate is slow, of poor quality simultaneously, and yielding poorly, it is high to consume.
For many years, people study solidification theory, seek the fast approach of cast of high-quality, all can not break through bobbin formula mold and crystallizer that tradition is shaped, research that can not handle assembly equipment and realize that the purpose of technological requirement combines dexterously.As rotate the square law device (Japan Patent 58-168458) of continuous casting, the very smooth strand in surface can be obtained, but base shell solidifying phase stable thermal conditions together can not be provided and keep.The method and apparatus of electromagnetic agitation for another example, (Japan Patent 58-215252) though be a kind of effectively dynamic grain refinement technology, it does not equally provide the sufficient thermodynamic condition of dynamic forming core yet.
When the objective of the invention is to liquid towards steel (or other metal, alloy) and realize rapid solidification this process is effectively controlled, formed and keep the freezing interface temperature＜t of certain value
F, make axle construction such as the as-cast structure of steel is, thereby it is even to obtain composition, institutional framework densification, no gross segregation, isotropic steel ingot (base).
Realization approach of the present invention is described below with reference to accompanying drawing 1:
Device is by changeover portion 1 among the figure, and setting section 2 and gripping section 3 are formed.
1. form the condensation liquid/solid interface excessively of certain value.
When qualified molten steel is injected the divergent contour multistage crystallizer that the cast slag is arranged with water-cooled, the cast slag in divergent contour changeover portion 1 is melted, the overheated also very fast disappearance of molten steel.At this moment, the outside of cast slag is benefited from water-cooled wall and is sharply cooled off, the inboard is subjected to the heat release of molten steel solidification again and is heated, after the solid phase of molten steel solidification forms, continue again to solidify, when the heat of pouring into a mould slag sharply cools off the heat of derivation less than wall, the cast slag will begin to be become by liquid state solid-state from the outside, like this, the molten steel solidification heat release just can't be derived, cross the solid process of condensation and disappear at once, its technology characteristics is exactly the temperature overfreezing limit of control freezing interface, guarantees that the solid phase of having solidified can connect when continuing to solidify well with fixed attention.
Technological parameter is:
(1) temperature (t of mistake condensation liquid/solid interface
F) be:
t
β≥t
S- (q
H)/(C
S P)
In the formula: t
S-solidus temperature (℃)
q
H-crystallization latent heat (J/Kg)
C
S P-specific heat (J/KgK)
(2) fusing point (t of cast slag
W) be:
t
P≤t
W＜t
S
Annotate: this is the principal character of cast slag.
2. cross the mobilism of condensation liquid/solid interface.
As mentioned above, crossing on the condensation liquid/solid interface of certain value, if after forming solid phase, crossing the solid process of condensation is about to disappear, therefore, the solid phase of forming core crystallization on the condensation liquid/solid interface was broken away from time (being the mobilism purpose), molten steel is filled in succession and is condensed, and crosses the condensation liquid/solid interface and just can keep with effective.
How realizing the mobilism of condensation liquid/solid interface, and proposed the changeover portion 1 of divergent contour multistage crystallizer in the present invention, is exactly the motion that its suitable tapering liner of Lixing and ejection direction are made oscillation cycle.When saturated liquid steel during in the rapid cooled and solidified of wall liner, separate out a large amount of gases, the solid volume of instantaneous forming core crystallization shrinks and the liquid phase convection current, cause a kind of boiling phenomenon at interface, promptly call the dynamic solidification interface, its effect is eutectic liquid and gas come-ups, and solid phase is free to descend, and becomes free (freedom) crystal grain in liquid phase.
3. casting blank section forming process.
The stage casing of divergent contour multistage crystallizer is setting section 2, and it is according to the requirement design of strand base type cross dimensions, and very little back draught is arranged.In casting process, the percentage by weight (promptly free brilliant rate η) that molten steel contains free brilliant solid phase in this section behind changeover portion 1 greater than 1.5% o'clock, under less temperature gradient, volume crystallization will occur, thereby obtains the measured steel ingot of matter (base).
4. the effect of gripping section 3 is to prevent high temperature billet shell both sides stress deformation and causes inner crack defect, and the effect of continuous casting ejection guiding is also arranged.
5. the selection of cast slag.
As mentioned above, the cast slag is that process of setting conducts heat, controls the temperature overfreezing limit of freezing interface and the extremely important material conditions of realization mobilism.Simultaneously in technical process, the liner of crystallizer is played lubrication again.The main component of cast slag is silicic acid disodium (Na
2Sio
3).
The invention has the advantages that a process and device design combine, solved the production approach of liquid steel (or other metal, alloy) high-speed superior casting ingot-forming (base), and device is safeguarded simple, reduced investment, the bleed-out accident is few, production safety, consume low, high efficiency.
Implementation method of the present invention 2 is illustrated in conjunction with the accompanying drawings.
According to the process of being chatted, only need divergent contour multistage crystallizer and original overall device are joined, promptly design the transformation of carrying out billet caster according to former crystallizer installation dimension.Shown in the accompanying drawing II, the changeover portion 1 of divergent contour multistage crystallizer joins with original equipment by ventilation flange 4.
Send dummy bar when operation, in dummy bar head enters crystallizer, 150 millimeters the time, stopping up the slit, adding " U " shape reinforcing bar and a small amount of aluminium ingot, adding 3～5 kilograms of cast slags (the cast slag will replenish adding at any time in whole casting process) again.Because of the present invention does not re-use the lubricated oil circuit of crystallizer, change the Argon pipeline into, when vacuum treated steel grade is adopted in cast, carry out Argon and stir, make the freezing interface in the changeover portion 1 form boiling.
Claims (9)
1, a kind of method that liquid steel (or other metal, alloy) is rapidly solidificated into ingot (base).It is characterized in that the liquid steel injection is had in the crystallizer of pouring into a mould slag with water-cooled, carry out rapid solidification when under inside and outside power effect, forming a large amount of crystallites, improve poring rate and quality thus.It is a kind of crystallite pouring procedure.
2, method according to claim 1 is characterized in that freezing interface temperature＜t
FMore than or equal to solidifying solidus temperature＜t
SAnd crystallization latent heat＜q
HAnd solidify solid phase specific heat＜C
S PThe difference of ratio, that is: t
β〉=t
S-(qH)/(CSP).
3, method according to claim 1 is characterized in that pouring into a mould the fusing point＜t of slag
WMore than or equal to freezing interface temperature＜t
FLess than the solidus temperature＜t that solidifies
S, that is: t
S≤ t
W＜t
S
4, method according to claim 1 is characterized in that forming a large amount of crystallites and is free in the liquid phase of ot-yet-hardened on dynamic interface.As free (freedom) brilliant rate＜η that forms in the liquid steel (or other metal, alloy)〉greater than 1.5% the time, it is even to obtain composition, compact structure, no gross segregation, isotropic steel ingot (base).
5, a kind of device that liquid steel (or other metal, alloy) is rapidly solidificated into ingot (base).The crystallizer that it is characterized in that the setting section that requires by the changeover portion of divergent contour with according to strand base type chi and form for the section of seizing on both sides by the arms that prevents the casting blank deformation bleed-out.Be called divergent contour multistage crystallizer.
6, device according to claim 5 is characterized in that having the divergent contour changeover portion.
7, device according to claim 5 is characterized in that the liner of divergent contour changeover portion is shaped as along tapering.
8, device according to claim 5 is characterized in that the stage casing of crystallizer is the setting section.
9, device according to claim 5, the end that it is characterized in that crystallizer is the section of seizing on both sides by the arms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107702 CN86107702A (en) | 1986-11-08 | 1986-11-08 | Microcrystal casting method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107702 CN86107702A (en) | 1986-11-08 | 1986-11-08 | Microcrystal casting method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86107702A true CN86107702A (en) | 1988-05-18 |
Family
ID=4803651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107702 Pending CN86107702A (en) | 1986-11-08 | 1986-11-08 | Microcrystal casting method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86107702A (en) |
-
1986
- 1986-11-08 CN CN 86107702 patent/CN86107702A/en active Pending
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