CN106825461B - A kind of device refining grain structure - Google Patents
A kind of device refining grain structure Download PDFInfo
- Publication number
- CN106825461B CN106825461B CN201611252028.XA CN201611252028A CN106825461B CN 106825461 B CN106825461 B CN 106825461B CN 201611252028 A CN201611252028 A CN 201611252028A CN 106825461 B CN106825461 B CN 106825461B
- Authority
- CN
- China
- Prior art keywords
- vibration
- vibrating head
- grain structure
- steel ingot
- cooling medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- B22D7/06—Ingot moulds or their manufacture
-
- 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
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- 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
- B22D27/08—Shaking, vibrating, or turning of moulds
-
- 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
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
Abstract
The invention discloses a kind of devices and application method for refining grain structure, belong to metallurgical technology field, including vibration device in insertion steel ingot die, the vibration device includes the vibrating head directly contacted with molten steel, setting is for driving the vibration generation source of vibration rod motion on vibrating head, the wherein discharge line that is passed through pipeline and upper end two sides setting for cooling medium recycle of the vibrating head center setting for cooling medium circulation.The present invention imposes vibration in During Ingot Solidification, promotes dendrite fusion and is crushed, and increases the number for the cold crystalline substance that dissociates, to inhibit the growth of column crystal, improves equiaxial crystal ratio, thinning solidification structure, achievees the purpose that mitigate segregation.
Description
Technical field
The present invention relates to a kind of devices and application method for refining grain structure, especially a kind of to be suitable for refinement Cr5 material
The device and its application method of the grain structure of matter support roll, belong to metallurgical technology field.
Background technique
In recent years, as rolling industry develops, for rolling high precision product, newly-built tandem rolling or singlestandmill,
Based on six-high cluster mill.In order to realize rolling high precision rolling and improve milling train production efficiency, milling train is just gradually to high speed, existing
Generationization development, wherein large forged back -up roll is the core functional components of present steel rolling equipment, is primarily subjected to working roll or centre
The rolling load of roller, as the continuous development of milling train improves, the draught pressure of milling train is continued to increase, and draught pressure down stroke is continuous
Increase, so that the body surface pressure of the backing roll of large-scale forged steel constantly increases, axle journal moment of flexure constantly increases, to must assure that
Large forged back -up roll is able to bear worse rolling operating condition, therefore, has to the surface hardness of large forged back -up roll high
Requirement.
Currently, the material of large forged back -up roll mostly uses Cr5, production technology is generally casting and forming or is forged into
Type, when production technology is casting and forming, process flow are as follows: melting-casting steel ingot-steel ingot pretreatment-melting steel ingot-is poured
Note-backing roll heat treatment；When if forging molding, process flow are as follows: melting-casting steel ingot-steel ingot pre-processes-forges work
Skill, from the point of view of the process by two kinds of above-mentioned moulding process, the quality of steel ingot used by support roll is located at vital
Status.
However when being poured support roll steel ingot, easily there are the internal flaws such as segregation, shrinkage cavity and shrinkage porosite, these are lacked
Sunken formation and casting and process of setting are closely related；It is dynamic in process of setting in support roll During Ingot Solidification
Amount decaying is very fast, and internal is mainly natural convection, and not only there is common to have " V " for big cross section inside ingot
Type segregation defects, sometimes there is also the segregation of inverted " V " type between center and edge, this will be further exacerbated by center porosity and contracting
The severity of hole defect, such gross segregation seriously affect the tissue and performance of steel ingot, and are difficult to by forging, being heat-treated
Subsequent technique is eliminated, therefore the backing roll of high rigidity, high-wearing feature in order to obtain, must just eliminate these defects.At this stage, this
The control method of kind segregation generally comprises control solidified structure, the flowing in reduction mushy zone vertical direction, reduces solute
In the convection current of liquid phase and swabbing action etc., concrete measure includes Prepared by Low Superheat Pouring, improves slenderness ratio, the increasing of ingot mould top
Add riser, in riser using exothermic mixture etc..
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of devices and application method for refining grain structure, in steel ingot
Vibration is imposed in process of setting, promote dendrite fusion and is crushed, and increases the number for the cold crystalline substance that dissociates, to inhibit column crystal
Production improves equiaxial crystal ratio, thinning solidification structure, achievees the purpose that mitigate gross segregation.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of device refining grain structure, it is characterised in that: including vibration device in insertion steel ingot die, the vibration
Device includes the vibrating head directly contacted with molten steel, is connected to for driving the vibration generation source of vibration rod motion on vibrating head,
Wherein the setting of vibrating head center is situated between for the upper end two sides setting for being passed through pipeline and vibrating head of cooling medium circulation for cooling
The discharge line of matter circulation.
Technical solution of the present invention further improvement lies in that: vibration generation source is Double frequency oscillating guide.
Technical solution of the present invention further improvement lies in that: it is continuous that vibrating head, which is inserted into the longitudinal section of part in steel ingot die,
Polyline shaped, the angle between adjacent broken line is acute angle.
Technical solution of the present invention further improvement lies in that: steel ingot die internal layer be arranged one layer of forming core promotor.
Technical solution of the present invention further improvement lies in that: cooling medium be compressed air or liquid nitrogen.
A kind of device application method refining grain structure, it is characterised in that: including the following steps:
Step A, vibration device is immersed into certain depth in steel ingot die, and is poured melted metal by running gate system
Liquid；
Step B, while being filled with steel ingot die with molten metal, the switch of vibration generation source is opened, vibration is adjusted
The frequency and time of vibration in source drive vibrating head to carry out the vibration of small frequency, and start to be passed through cooling medium, and control cooling Jie
Matter is passed through speed；
Step C, after vibration, demoulding is taken out after steel ingot is cooled to room temperature.
Technical solution of the present invention further improvement lies in that: in step A, vibration device immerse steel ingot die in depth be
150mm~200mm.
Technical solution of the present invention further improvement lies in that: in step B, the frequency of vibration generation source is 20~100HZ；Vibration
The dynamic time continues to 15min~20min after casting.
Technical solution of the present invention further improvement lies in that: in step B, cooling medium be passed through speed be 3~6 cubes
M/min.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
The present invention imposes vibration in ingot solidification early stage by vibration device, the vibration force and impact generated due to vibration
On the one hand power can lead to the dendrite fusion grown up or be crushed to form new nucleus, increase the number for the cold crystalline substance that dissociates,
Form a large amount of nucleus cores, for tiny equiax crystal formation provide forming core basis, meanwhile, the number of new nucleus increase and
Inhibit crystal grain to grow up, can play the effect of refinement crystal grain；On the other hand, vibration device can promote the flowing of molten metal, make
The gas generated in fusion process overflows in vibration processes, purifying molten metal, reduces the residual gas inside backing roll, disappears
Except the hole of bearing roller surface, shrinkage defect is reduced, therefore, the frequency of strict control vibration generation source of the present invention makes its position
It in 20~100HZ, avoids frequency excessively high or too low, causes the reduction of crystal nucleation rate, and control time of vibration simultaneously,
While guaranteeing crystal nucleation rate, the reasonably optimizing production time reaches the effect of reducing cost.
Further, vibrating head of the present invention improves traditional shape straight up and down, is designed to vertical cut
Face is continuous polyline shaped, and the angle between adjacent broken line is acute angle, on the one hand provides forming core circle for nucleus, is formed certain
Rise and fall of structure, reduce forming core resistance, improve nucleation rate, promote the crystal grain of solidified structure to homogenization develop, reach drop
Low gross segregation, the purpose for refining crystal grain, on the other hand, the high frequency of bevel structure and vibrating head on vibrating head are vibrated by a small margin
It cooperates, so that nascent nucleus largely, is continuously launched into metal liquid, is formed in metal solidification process thereafter
The core for generating a large amount of equiax crystal avoids crystal grain on the surface of vibration and carries out forming core.
One layer of forming core promotor is arranged in steel ingot die internal layer, provides heterogeneous nucleation point for molten metal, improves nucleation rate,
Achieve the purpose that refine crystal grain, mutually promotes with the vibrating effect of vibrating head, further increase the nucleation probability of equiax crystal.
The present invention also strict control cooling medium is passed through speed, it is ensured that exist between vibrating head and molten metal guarantee it is brilliant
The degree of supercooling of particle shape core, and the interface in the solid liquid interface forward position of molten metal is made to be able to satisfy the condition of forming core, molten metal is in vibrating head
Surface can quick forming core, improve core forming speed, achieve the effect that refine crystal grain.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is another structural schematic diagram of the invention；
Fig. 3 is usage state diagram of the invention；
Wherein, 1, vibrating head, 2, vibration generation source, 3, be passed through pipeline, 4, discharge line, 5, steel ingot die, 6, casting system
System, α angle between adjacent fold line.
Specific embodiment
The present invention is described in further details below with reference to embodiment:
As shown in Figure 1, Figure 3, vibration device in a kind of device refining grain structure, including insertion steel ingot die 5, it is described
Vibration device includes the vibrating head 1 directly contacted with molten steel, is connected on vibrating head for driving the vibration hair of vibration rod motion
Source of students 2, wherein the setting of vibrating head center is used for for the upper end two sides setting for being passed through pipeline 3 and vibrating head of cooling medium circulation
The discharge line 4 of cooling medium circulation, wherein vibration generation source 2 is Double frequency oscillating guide, the frequency of setting vibrator that can be intelligent
Rate, when molten metal is after the quick forming core in vibrating head surface, these nascent nucleus vibration force and impact force effect, it is a large amount of
, continuously launch in molten metal, a large amount of equiax crystal cores in metal solidification process are formed, in addition, suitable vibration
Power and impact force, which may further result in the dendrite fusion grown up or be crushed, forms new nucleus, increases the cold crystalline substance that dissociates
Number forms a large amount of nucleus cores, provides forming core basis for the formation of tiny equiax crystal, the number of nucleus new in this way increases
And crystal grain is inhibited to grow up, it can play the effect of refinement crystal grain；
The cooling medium that the present invention uses for compressed air or liquid nitrogen, play reduction and be produced into than wide by source
This function
In order to further improve nucleation rate, the longitudinal section of vibrating head is designed as continuous polyline shaped, shown in Fig. 2, phase
Angle α between adjacent broken line is acute angle, on the one hand provides forming core interface for nucleus, forms certain rise and fall of structure, is reduced
Forming core resistance, improves nucleation rate, and the crystal grain of solidified structure is promoted to develop to homogenization, and reaching reduces gross segregation, refinement
The purpose of crystal grain, on the other hand, the high frequency of bevel structure and vibrating head on vibrating head vibrate mutual cooperation by a small margin, so that just
Raw nucleus largely, is continuously launched into metal liquid, is formed in metal solidification process thereafter and is generated a large amount of equiax crystal
Core, avoid crystal grain in the surface forming core of vibration.
One layer of forming core promotor is arranged in 5 internal layer of steel ingot die, selects Fe-C alloy or composite nucleating agent, mentions for molten metal
Heterogeneous nucleation point has been supplied, nucleation rate is provided, has achieved the purpose that refine crystal grain, mutually promote with the vibrating effect of vibrating head, into
The nucleation probability of one step raising equiax crystal.
A kind of device application method refining grain structure, it is characterised in that: including the following steps:
Step A, vibration device is immersed in steel ingot die, immersion depth is 150mm~200mm, and passes through casting system
System 6, which is opened, is poured melted molten metal；Wherein running gate system is bottom filling；
Step B, while being filled with steel ingot die with molten metal, the switch of vibration generation source is opened, vibration is adjusted
The frequency and time of vibration in source drive vibrating head to carry out the vibration of small frequency, and start to be passed through cooling medium, and control cooling Jie
Matter is passed through speed；
In the process, for the cooling medium used for compressed air, the channel of cooling medium being passed through passes through connecting pipe
It is connected on air compressor, when molten metal is filled with steel ingot die, opening Double frequency oscillating guide makes moving up for vibrating head, adjusts
The frequency of vibration generation source, is allowed between 20~100HZ, opens simultaneously the switch of air compressor, adjusts compressed air
Intake be passed through with 3~6 cubic metres of speed per minute, make compressed air by enter channel enter in vibrating head, generate
Nucleus is excited, nucleus is passed to molten steel under the action of the vibration force of vibrating head and impact force, forms the core of equiax crystal, and compression is empty
Exhaust gas is formed after aspiration heat, the discharge line by the top setting of vibrating head for cooling medium circulation so carries out always
Until 15min~20min after casting, provides the enough reaction time in this way for nucleation process, final raising steel ingot is isometric
Brilliant rate and promotion solidified structure homogenize, and achieve the purpose that reduce gross segregation, refinement crystal grain.
Step C, after steel ingot is cooled to room temperature, steel ingot is taken out in demoulding.
After the device for designing refinement grain structure using the present invention, vibrating head forms a large amount of nucleus in ingot solidification early stage
Core improves nucleus basis for the formation of tiny equiax crystal, because there is the product of a large amount of nucleus, keeps the segregation phenomena of steel ingot big
Big to reduce, the steel ingot equiaxial crystal ratio of the technical treatment can reach 80%, and internal equiax crystal is tiny, fine and close, center porosity and segregation
It is reduced to 0.5 grade, and the equiaxial crystal ratio of untreated conventional steel ingot is generally 5% hereinafter, center porosity and segregation reach
3.0 grades in addition some reach 4.0 grades.
Claims (8)
1. a kind of device for refining grain structure, it is characterised in that: described including the vibration device in insertion steel ingot die (5)
Vibration device includes the vibrating head (1) directly contacted with molten steel, is connected on vibrating head for driving the vibration of vibration rod motion
Occurring source (2), wherein vibrating head center setting for cooling medium circulation be passed through pipeline (3) and the upper end two sides of vibrating head are set
Set the discharge line (4) for cooling medium circulation；The vertical of part in the insertion steel ingot die (5) of the vibrating head (1) cuts
Face is continuous polyline shaped, and the angle between adjacent broken line is acute angle.
2. a kind of refinement grain structure device according to claim 1, it is characterised in that: the vibration generation source (2) is
Double frequency oscillating guide.
3. a kind of device for refining grain structure according to claim 1, it is characterised in that: in the steel ingot die (5)
Layer one layer of forming core promotor of setting.
4. a kind of device for refining grain structure according to claim 1, it is characterised in that: the cooling medium is compression
Air or liquid nitrogen.
5. a kind of device for refining grain structure according to claim 1, it is characterised in that: refine the device of grain structure
Application method, including the following steps:
Step A, vibration device is immersed into certain depth in steel ingot die, and starts to be poured melted metal by running gate system
Liquid；
Step B, while being filled with steel ingot die with molten metal, the switch of vibration generation source is opened, vibration generation source is adjusted
Frequency and time of vibration drive vibrating head to carry out the vibration of small frequency, and start to be passed through cooling medium, control the logical of cooling medium
Enter speed；
Step C, after vibration, demoulding is taken out after steel ingot is cooled to room temperature.
6. a kind of device for refining grain structure according to claim 5, it is characterised in that: in step A, vibration device leaching
Entering depth in steel ingot die is 150mm~200mm.
7. a kind of device for refining grain structure according to claim 5, it is characterised in that: in step B, vibration generation source
Frequency be 20~100HZ；Time of vibration continues to 15min~20min after casting.
8. a kind of device for refining grain structure according to claim 5, it is characterised in that: in step B, cooling medium
Being passed through speed is 3~6 cubic meters per minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611252028.XA CN106825461B (en) | 2016-12-30 | 2016-12-30 | A kind of device refining grain structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611252028.XA CN106825461B (en) | 2016-12-30 | 2016-12-30 | A kind of device refining grain structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106825461A CN106825461A (en) | 2017-06-13 |
| CN106825461B true CN106825461B (en) | 2019-09-24 |
Family
ID=59114773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611252028.XA Active CN106825461B (en) | 2016-12-30 | 2016-12-30 | A kind of device refining grain structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106825461B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107971468A (en) * | 2017-12-29 | 2018-05-01 | 深圳微纳增材技术有限公司 | A kind of crystallizer for being used to refine ingot solidification tissue |
| CN111286566B (en) * | 2020-02-21 | 2021-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving crushing performance of FeV80 alloy |
| CN112828249A (en) * | 2020-12-31 | 2021-05-25 | 中钢集团邢台机械轧辊有限公司 | Ingot mold design method for reducing ingot pier thickening and longitudinal cracking |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2108878A (en) * | 1981-11-06 | 1983-05-25 | British Steel Corp | Vibration of a continuous casting machine mould |
| US7509993B1 (en) * | 2005-08-13 | 2009-03-31 | Wisconsin Alumni Research Foundation | Semi-solid forming of metal-matrix nanocomposites |
| CN101342580B (en) * | 2008-08-04 | 2010-09-15 | 西峡龙成特种材料有限公司 | Vacuum casting mold apparatus capable of continuously manufacturing and cleaning fine equiax crystal casting ingot |
| CN101435064B (en) * | 2008-12-08 | 2012-05-30 | 清华大学 | High sound intensity ultrasonic processing apparatus for metal and alloy solidification and processing method thereof |
| CN102554195A (en) * | 2011-12-31 | 2012-07-11 | 大连理工大学 | Power ultrasonic device for treating high-temperature metal melt under vacuum state and method thereof |
-
2016
- 2016-12-30 CN CN201611252028.XA patent/CN106825461B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106825461A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106825461B (en) | A kind of device refining grain structure | |
| CN105215310A (en) | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls | |
| CN101244451A (en) | Method and apparatus for improving horizontal continuous casting billet quality by applying composite field | |
| CN105215309A (en) | A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls | |
| CN104493095B (en) | The running gate system and its pouring procedure of thin-section casting | |
| CN101234420A (en) | Ultrasound wave compression mold casting method and special-purpose equipment thereof | |
| CN105026073A (en) | Casting equipment and casting method using same | |
| CN201231310Y (en) | Low-segregation large-size ingot obtaining device through quickening the cooling of the bottom, lateral wall | |
| CN101791681B (en) | Water-cooling die casting production process of plate blank used for medium plate | |
| CA2510831C (en) | Controlled fluid flow mold and molten metal casting method for improved surface | |
| CN103962525B (en) | A kind of cooling means for suppressing slab grain-boundary crack | |
| CN108889917A (en) | It is a kind of for providing the mold liquid level static type casting method of high-quality slab quality | |
| CN109663892B (en) | Progressive solidification forming device for large cast ingot or casting blank | |
| CN204975225U (en) | Be used for as cast casting mould of cast steel butterfly plate | |
| CN107150109B (en) | Method and device for bidirectionally cooling and dynamically pouring composite ingot | |
| CN101596590B (en) | Method for inhibiting large steel ingot from macrosegregation by mechanical stirring | |
| CN106011388B (en) | It is a kind of to improve the smelting process for pouring time the first stove heavy rail fault detection qualification rate | |
| CN204685985U (en) | A kind of gas lubricated crystallizer device for electromagnetic agitation | |
| CN111496204A (en) | Method for improving center segregation and porosity of continuous casting slab of medium-low carbon steel thick plate | |
| CN102350485A (en) | Device and process for repairing shrinkage holes during steel billet casting through intermediate-frequency electric heating | |
| JP2005066660A (en) | Molding stock manufacturing method | |
| CN104174817B (en) | A kind of ocean platform climb casting and the Technology for Heating Processing of machine Connection Block | |
| CN110541056B (en) | Process for reducing center segregation of casting blank | |
| JP2004216411A (en) | Continuous casting method for special molten steel | |
| CN103128268B (en) | For the method for low temperature shake out in large extra thick plate blank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |