CN106825461A - The device and application method of a kind of crystal grain thinning tissue - Google Patents
The device and application method of a kind of crystal grain thinning tissue Download PDFInfo
- Publication number
- CN106825461A CN106825461A CN201611252028.XA CN201611252028A CN106825461A CN 106825461 A CN106825461 A CN 106825461A CN 201611252028 A CN201611252028 A CN 201611252028A CN 106825461 A CN106825461 A CN 106825461A
- Authority
- CN
- China
- Prior art keywords
- crystal grain
- vibration
- grain thinning
- steel ingot
- vibrating head
- 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.)
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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 the device and application method of a kind of crystal grain thinning tissue, belong to metallurgical technology field, including vibrating device in insertion steel ingot die, the vibrating device include with the vibration generation source for being provided for driving vibration rod motion on the vibrating head of molten steel directly contact, vibrating head, wherein vibrating head it is centrally disposed for cooling medium circulation be passed through pipeline and upper end both sides are provided for the discharge line of cooling medium circulation.The present invention imposes vibration in During Ingot Solidification, promotes dendrite fusion and crushes, and increases free cold brilliant number, so as to suppress the growth of column crystal, improves equiaxial crystal ratio, thinning solidification structure, reaches the purpose of mitigation segregation.
Description
Technical field
It is especially a kind of to be applied to refinement Cr5 materials the present invention relates to the device and application method of a kind of crystal grain thinning tissue
The device and its application method of the grain structure of matter support roll, belong to metallurgical technology field.
Background technology
In recent years, with steel rolling industrial development, 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 progressively to high speed, existing
Generationization develops, 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, with the improvement that continues to develop of milling train, 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, and axle journal moment of flexure constantly increases, so as to must assure that
Large forged back -up roll can bear worse rolling operating mode, therefore, have high to the case hardness of large forged back -up roll
Requirement.
At present, Cr5 is used the material of large forged back -up roll, production technology is generally casting or is forged into more
Type, when production technology is casting, its technological process is：Melting-cast steel ingot-steel ingot pretreatment-melting steel ingot-pour
Note-backing roll is heat-treated；If during forging molding, its technological process is：Melting-cast steel ingot-steel ingot pre-processes-forge work
Skill, from the point of view of two kinds of above-mentioned flows of moulding process, the quality of the steel ingot that support roll is used is positioned at vital
Status.
But when support roll steel ingot is poured into a mould, easily there are the internal flaws such as segregation, shrinkage cavity and shrinkage porosite, these lack
Sunken formation is closely related with cast and process of setting；It is dynamic in process of setting in support roll During Ingot Solidification
Amount decay is very fast, and it is internal to be mainly natural convection, and big cross section inside ingot not only exists common with " V "
Type segregation defects, also have inverted " V " type segregation sometimes between center and edge, and this will be further exacerbated by center porosity and contracting
The order of severity of hole defect, this kind of gross segregation has a strong impact on the tissue and performance of steel ingot, and is difficult to by forging, heat treatment etc.
Subsequent technique is eliminated, therefore in order to obtain the backing roll of high rigidity, high-wearing feature, must just eliminate these defects.At this stage, this
The control method for planting segregation generally comprises control solidified structure, the flowing reduced in the vertical direction of mushy zone, 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
Plus rising head, emit intraoral use exothermic mixture etc..
The content of the invention
The technical problem to be solved in the invention is to provide the device and application method of a kind of crystal grain thinning tissue, in steel ingot
Vibration is imposed in process of setting, is promoted dendrite fusion and is crushed, and increase free cold brilliant number, so as to suppress column crystal
Production, improves equiaxial crystal ratio, thinning solidification structure, reaches the purpose for mitigating gross segregation.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of device of crystal grain thinning tissue, it is characterised in that：Including vibrating device, the vibrating device in insertion steel ingot die
Including the vibrating head with molten steel directly contact, the vibration generation source for being used for drive vibration rod motion is connected on vibrating head, wherein
The centrally disposed upper end both sides for being passed through pipeline and vibrating head for cooling medium circulation of vibrating head are provided for cooling medium and follow
The discharge line of ring.
Technical solution of the present invention further improvement is that：Vibration generation source is Double frequency oscillating guide.
Technical solution of the present invention further improvement is that：The longitudinal section of part is continuous in vibrating head insertion steel ingot die
Polyline shaped, the angle between adjacent broken line is acute angle.
Technical solution of the present invention further improvement is that：Steel ingot die internal layer sets one layer of forming core accelerator.
Technical solution of the present invention further improvement is that：Cooling medium is compressed air or liquid nitrogen.
A kind of device application method of crystal grain thinning tissue, it is characterised in that：Including following steps：
Step A, vibrating device is immersed into certain depth in steel ingot die, and melted molten metal is poured into a mould by running gate system；
Step B, with molten metal be filled with steel ingot die while, open the switch of vibration generation source, regulation vibration generation source
Frequency and time of vibration, drive vibrating head to carry out the vibration of small frequency, and start to be passed through cooling medium, and control cooling medium
It is passed through speed；
After step C, vibration terminate, form removal is taken out after steel ingot is cooled to room temperature.
Technical solution of the present invention further improvement is that：In step A, depth is in vibrating device immersion steel ingot die
150mm~200mm.
Technical solution of the present invention further improvement is that：In step B, the frequency of vibration generation source is 20~100HZ；Shake
The dynamic time lasts till that cast terminates rear 15min~20min.
Technical solution of the present invention further improvement is that：In step B, the speed that is passed through of cooling medium is 3~6 cubes
M/min.
By adopting the above-described technical solution, the technological progress that the present invention is obtained is：
The present invention imposes vibration by vibrating device in ingot solidification early stage, due to vibration force and impulsive force that vibration is produced, one
Aspect can cause the dendrite fusion grown up or the broken number for forming new nucleus, increased free cold crystalline substance, be formed
A large amount of nucleus cores, for the formation of tiny equiax crystal provides forming core basis, meanwhile, the number of new nucleus increases and suppresses
Crystal grain is grown up, and can play the effect of crystal grain thinning；On the other hand, vibrating device can promote the flowing of molten metal, make melting
During the gas that produces is overflowed in vibration processes, purifying molten metal reduces the residual gas inside backing roll, eliminates and props up
The hole of roll surface, reduces shrinkage defect, therefore, the frequency of the strict control vibration generation source of the present invention is located at 20
~100HZ, it is to avoid frequency is too high or too low, causes the reduction of crystal nucleation rate, and controls time of vibration simultaneously, is ensureing
While crystal nucleation rate, the reasonably optimizing production time reaches effect of reduces cost.
Further, vibrating head of the present invention improves traditional shape straight up and down, is designed to vertical cutting
Face is continuous polyline shaped, and the angle between adjacent broken line is acute angle, on the one hand for nucleus provides forming core circle, forms certain
Rise and fall of structure, reduce forming core resistance, improve nucleation rate, promote the crystal grain of solidified structure to develop to homogenization, reach drop
Low gross segregation, the purpose of crystal grain thinning, on the other hand, the high frequency of ramp structure and vibrating head on vibrating head vibrates by a small margin
Cooperate so that nascent nucleus largely, is continuously launched in metal liquid, and formation is thereafter in metal solidification process
Generate the core of a large amount of equiax crystal, it is to avoid crystal grain carries out forming core on the surface of vibration.
Steel ingot die internal layer sets one layer of forming core accelerator, for molten metal provides heterogeneous forming core point, improves nucleation rate,
The purpose of crystal grain thinning is reached, the vibrating effect with vibrating head is mutually promoted, further improve the nucleation probability of equiax crystal.
What the present invention also strictly controlled cooling medium is passed through speed, it is ensured that exists between vibrating head and molten metal and ensures brilliant
The degree of supercooling of particle shape core, and the interface in the solid liquid interface forward position of molten metal is met the condition of forming core, molten metal is in vibrating head
Surface can quick forming core, improve core forming speed, reach the effect of crystal grain thinning.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is another structural representation of the invention；
Fig. 3 is use state figure of the invention；
Wherein, 1, vibrating head, 2, vibration generation source, 3, be passed through pipeline, 4, discharge line, 5, steel ingot die, 6, running gate system, α
It is angle between adjacent fold line.
Specific embodiment
The present invention is described in further details with reference to embodiment：
As shown in Figure 1, Figure 3, vibrating device, the vibration in a kind of device of crystal grain thinning tissue, including insertion steel ingot die 5
Device include with the vibrating head 1 of molten steel directly contact, be connected on vibrating head and be used for the vibration generation source for driving vibration rod motion
2, the wherein centrally disposed upper end both sides for being passed through pipeline 3 and vibrating head for cooling medium circulation of vibrating head are provided for cooling
The discharge line 4 of medium circulation, wherein vibration generation source 2 are Double frequency oscillating guide, the frequency of setting vibrator that can be intelligent, when
Molten metal after the quick forming core in vibrating head surface, these nascent nucleus vibration force and impulsive force effect, by it is substantial amounts of, even
Continuous constantly ejection forms a large amount of equiax crystal cores in metal solidification process in molten metal, in addition, suitable vibration force and
Impulsive force may further result in the dendrite fusion or the broken number for forming new nucleus, increased free cold crystalline substance grown up,
Form a large amount of nucleus cores, for the formation of tiny equiax crystal provide forming core basis, the number of so new nucleus increase and
Suppress crystal grain to grow up, can play the effect of crystal grain thinning；
The cooling medium that the present invention is used is compressed air or liquid nitrogen, and reduction production cost is played in its source than wide
Function
In order to further improve nucleation rate, the longitudinal section of vibrating head is designed as continuous polyline shaped, it is adjacent shown in Fig. 2
Angle α between broken line is acute angle, on the one hand for nucleus provides forming core interface, forms certain rise and fall of structure, reduces shape
Core resistance, improves nucleation rate, promotes the crystal grain of solidified structure to develop to homogenization, reaches reduction gross segregation, crystal grain thinning
Purpose, on the other hand, the high frequency of ramp structure and vibrating head on vibrating head vibrates mutuals cooperation by a small margin so that nascent brilliant
Core by it is a large amount of, continuously launched in metal liquid, form the core that a large amount of equiax crystal are generated in metal solidification process thereafter
The heart, it is to avoid surface forming core of the crystal grain in vibration.
The internal layer of steel ingot die 5 sets one layer of forming core accelerator, is that molten metal is carried from Fe-C alloys or composite nucleating agent
Heterogeneous forming core point is supplied, there is provided nucleation rate, has reached the purpose of crystal grain thinning, the vibrating effect with vibrating head has been mutually promoted, and is entered
One step improves the nucleation probability of equiax crystal.
A kind of device application method of crystal grain thinning tissue, it is characterised in that：Including following steps：
Step A, vibrating device is immersed in steel ingot die, its immersion depth is 150mm~200mm, and is opened by running gate system 6
The melted molten metal of cast；Wherein running gate system is bottom filling；
Step B, with molten metal be filled with steel ingot die while, open the switch of vibration generation source, regulation vibration generation source
Frequency and time of vibration, drive vibrating head to carry out the vibration of small frequency, and start to be passed through cooling medium, and control cooling medium
It is passed through speed；
In the process, the cooling medium for using is compressed air, and the passage being passed through of cooling medium is connected by connecting pipe
To air compressor, when molten metal is filled with steel ingot die, opening Double frequency oscillating guide makes moving up for vibrating head, regulation vibration
The frequency of occurring source, is allowed to be located between 20~100HZ, while opening the switch of air compressor, adjusts the logical of compressed air
Enter amount to be passed through with 3~6 cubic metres per minute of speed, make compressed air pass through to enter in vibrating head into passage, generation is excited
Nucleus, nucleus incoming molten steel in the presence of the vibration force and impulsive force of vibrating head forms the core of equiax crystal, and compressed air is inhaled
Waste gas is formed after heat, by the top of vibrating head be provided for cooling medium circulate discharge line, so carry out always until
Cast terminates rear 15min~20min, final to improve steel ingot equiaxial crystal ratio so for nucleation process provides the enough reaction time
Homogenized with promotion solidified structure, reach reduction gross segregation, the purpose of crystal grain thinning.
Step C, after steel ingot is cooled to room temperature, form removal take out steel ingot.
After device using present invention design crystal grain thinning tissue, vibrating head in early days, forms a large amount of nucleus in ingot solidification
Core, is that the formation of tiny equiax crystal improves nucleus basis, because there is the product of a large amount of nucleus, makes the segregation phenomena of steel ingot big
Big to reduce, the steel ingot equiaxial crystal ratio of the technical finesse can reach 80%, and internal equiax crystal is tiny, densification, center porosity and segregation
0.5 grade is reduced to, and the equiaxial crystal ratio of untreated conventional steel ingot is general below 5%, center porosity and segregation reach
3.0 grades, or even some reach 4.0 grades.
Claims (9)
1. a kind of device of crystal grain thinning tissue, it is characterised in that：Including insertion steel ingot die（5）In vibrating device, it is described
Vibrating device includes the vibrating head with molten steel directly contact（1）, be connected on vibrating head be used for drive vibration rod motion vibration
Occurring source（2）, wherein vibrating head is centrally disposed is passed through pipeline for cooling medium circulation（3）And the upper end both sides of vibrating head set
Put the discharge line for cooling medium circulation（4）.
2. a kind of crystal grain thinning tissue device according to claim 1, it is characterised in that：The vibration generation source（2）For
Double frequency oscillating guide.
3. the device of a kind of crystal grain thinning tissue according to claim 1, it is characterised in that：The vibrating head（1）Insert
Enter steel ingot die（5）In part longitudinal section be continuous polyline shaped, the angle between adjacent broken line is acute angle.
4. the device of a kind of crystal grain thinning tissue according to claim 1, it is characterised in that：The steel ingot die（5）It is interior
Layer sets one layer of forming core accelerator.
5. the device of a kind of crystal grain thinning tissue according to claim 1, it is characterised in that：The cooling medium is compression
Air or liquid nitrogen.
6. a kind of device application method of crystal grain thinning tissue, it is characterised in that：Including following steps：
Step A, vibrating device is immersed into certain depth in steel ingot die, and melted molten metal is poured into a mould by running gate system；
Step B, with molten metal be filled with steel ingot die while, open the switch of vibration generation source, regulation vibration generation source
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；
After step C, vibration terminate, form removal is taken out after steel ingot is cooled to room temperature.
7. the device application method of a kind of crystal grain thinning tissue according to claim 6, it is characterised in that：In step A, shake
Depth is 150mm~200mm in dynamic device immersion steel ingot die.
8. the device application method of a kind of crystal grain thinning tissue according to claim 6, it is characterised in that：In step B, shake
The frequency of dynamic occurring source is 20~100HZ；Time of vibration lasts till that cast terminates rear 15min~20min.
9. the device application method of a kind of crystal grain thinning tissue according to claim 6, it is characterised in that：It is cold in step B
But the speed that is passed through of medium 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 |
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| Publication Number | Publication Date |
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| CN106825461A true CN106825461A (en) | 2017-06-13 |
| CN106825461B CN106825461B (en) | 2019-09-24 |
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| CN201611252028.XA Active CN106825461B (en) | 2016-12-30 | 2016-12-30 | A kind of device refining grain structure |
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Cited By (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 |
| CN111286566A (en) * | 2020-02-21 | 2020-06-16 | 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 |
Citations (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 |
| CN101342580A (en) * | 2008-08-04 | 2009-01-14 | 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 |
| US7509993B1 (en) * | 2005-08-13 | 2009-03-31 | Wisconsin Alumni Research Foundation | Semi-solid forming of metal-matrix nanocomposites |
| CN101435064A (en) * | 2008-12-08 | 2009-05-20 | 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
Patent Citations (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 |
| CN101342580A (en) * | 2008-08-04 | 2009-01-14 | 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 |
| CN101435064A (en) * | 2008-12-08 | 2009-05-20 | 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 |
Cited By (4)
| 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 |
| CN111286566A (en) * | 2020-02-21 | 2020-06-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving crushing performance of FeV80 alloy |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN106825461B (en) | 2019-09-24 |
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