CN105401051B - The ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron and its nodularization bag - Google Patents
The ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron and its nodularization bag Download PDFInfo
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- CN105401051B CN105401051B CN201510999550.3A CN201510999550A CN105401051B CN 105401051 B CN105401051 B CN 105401051B CN 201510999550 A CN201510999550 A CN 201510999550A CN 105401051 B CN105401051 B CN 105401051B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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Abstract
The invention discloses a kind of ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, including：Step S1：In the side bottom of dykes and dams one of dam-type nodularization bag, one layer of nodulizer is first set, one layer of coverture is set on nodulizer surface and consolidated, cover plate is placed on coverture, nodulizer, the first inovulant and coverture are sequentially placed on the cover board, and cover plate is rustless carbon steel plate or shaping magnesium iron plate or shaped steel plate；Step S2：The molten iron after scum silica frost will be removed in tundish pour into the side for being not provided with nodulizer of dam-type nodularization bag.The ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron provided using the present invention, by way of spheroidizing reacion twice is carried out in succession, extends the time of spheroidizing reacion, improves the absorptivity of rare earth magnesium.And then casting residual Re content of magnesium is improved, reduce later stage scaling loss, improve nodulizing grade, and then improve the quality of final casting.The invention also discloses a kind of nodularization bag of the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron.
Description
Technical field
The present invention relates to casting iron craft technical field, more specifically to a kind of ladle-to-ladle nodularization of evaporative pattern spheroidal graphite cast-iron
Inoculated technology, further relates to a kind of nodularization bag of the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron.
Background technology
Spheroidal graphite cast-iron is a kind of 20th century high-strength cast iron material for growing up of the fifties, its combination property close to
Steel, is based on its excellent performance, has been successfully used to cast some stress complexity, intensity, toughness, wearability require higher
Part.Spheroidal graphite cast-iron developed rapidly for be only second to gray cast iron, using quite varied cast iron materials.The life of spheroidal graphite cast-iron
Production. art generally comprises following link：The qualified iron liquid of melting；Nodularization-inoculation；Foundry test；Pouring cast part；Clearly
Reason and heat treatment；Casting quality is examined.Wherein, the effect of spheroidising is to make graphite in crystalline growth duration glomeration to improve
Matrix pattern improves the mechanical property of casting；Make globular graphite rounding, refinement during inoculation, further improve intensity.
Lost foam casting is the cavityless casting that foam mould uses bindless dry sand combination vacuum pumping technology.It has
Casting quality is good, cost is low, material is not limited, any surface finish, internal flaw greatly reduce, dense structure, can be achieved it is extensive, big
The series of advantages such as batch production.It is many using conventional ladle-to-ladle spheroidizing process when producing spheroidal graphite cast-iron with evaporative pattern.Conventional
Ladle-to-ladle spheroidizing process is that a certain amount of nodulizer is positioned over into ladle bag bottom, tight with coverture and inovulant covering thereon,
Then molten iron is poured.
However, there is following problem using above-mentioned technique when producing spheroidal graphite cast-iron in evaporative pattern.First, evaporative pattern is produced
The ladle-to-ladle treatment temperature of spheroidal graphite cast-iron is high, and nodulizer reaction is fast, the more difficult control of nodularization time, thus in nodulizer magnesium absorptivity
It is low.And then the residual volume of the molten iron magnesium after handling is low, scaling loss is very fast under the condition of high temperature, so that the nodulizing grade of casting is low, nodularization
Decline is serious.Therefore, evaporative pattern can not produce high-quality nodular iron casting, off-iron rate in conventional ladle-to-ladle spheroidizing process
Height, therefore and do not apply to.
In summary, how to efficiently solve evaporative pattern production spheroidal graphite cast-iron nodularization grade it is low, nodular iron casting is of poor quality,
The problems such as percent defective is high, is current those skilled in the art's urgent problem.
The content of the invention
In view of this, first purpose of the invention is to provide a kind of evaporative pattern spheroidal graphite cast-iron ladle-to-ladle spheroidization and inoculation work
Skill, the ladle-to-ladle spheroidization and inoculation technique of the evaporative pattern spheroidal graphite cast-iron can efficiently solve evaporative pattern production spheroidal graphite cast-iron nodularization grade
The problem of low, nodular iron casting is of poor quality, percent defective is high.Second object of the present invention is to provide a kind of evaporative pattern spheroidal graphite casting
The nodularization bag of the ladle-to-ladle spheroidization and inoculation technique of iron.
In order to reach above-mentioned first purpose, the present invention provides following technical scheme：
A kind of ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, including：
Step S1：One layer of nodulizer is first set in the side bottom of dykes and dams one of dam-type nodularization bag, on the nodulizer surface
Set one layer of coverture simultaneously to consolidate, cover plate is placed on the coverture, nodulizer is sequentially placed on the cover plate, first pregnant
Agent and coverture are educated, the cover plate is rustless carbon steel plate or shaping magnesium iron plate or shaped steel plate；
Step S2：Nodulizer is not provided with by remove that the molten iron after scum silica frost pours into the dam-type nodularization bag in tundish
Side.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, the step S1 is specially：
In the side bottom of dykes and dams one of dam-type nodularization bag, the ball that one layer weight is weight of molten iron 0.75%-0.85% is first set
Agent, coverture and tamping of the layer weight for weight of molten iron 0.05%-0.15% is covered on the nodulizer surface, described
The nodulizer, again placed on cover plate, the cover plate and be sequentially placed that weight is weight of molten iron 0.55%-0.65% is placed on coverture
The first inovulant that amount is weight of molten iron 0.05%-0.15% and the coverture that weight is weight of molten iron 0.05%-0.15%.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, step is also included before the step S1：
Electric furnace molten iron is warming up to 1560-1600 DEG C, it is weight of molten iron 0.05-0.15%'s that weight is sprinkled into after the slagging-off of surface
Carborundum pretreating agent, and it is incubated 9-11 minutes.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, step is also included after the step S2：
When spheroidizing reacion starts rear 20-30s, weight is sprinkled into the nodularization bag for weight of molten iron 0.45%-0.55%
The second inovulant, the 5-15s before spheroidizing reacion terminates is sprinkled into weight for weight of molten iron 0.25%- in the nodularization bag
0.35% the 3rd inovulant.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, it is sprinkled into the weight of second inovulant
For the 0.5% of weight of molten iron, the weight of the 3rd inovulant is the 0.3% of weight of molten iron.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, first inovulant breeds for ferrosilicon
Agent, second inovulant and the 3rd inovulant are silico-calcium and silicon barium composite inoculant.
Preferably, in the ladle-to-ladle spheroidization and inoculation technique of above-mentioned evaporative pattern spheroidal graphite cast-iron, in addition to：Terminate in the spheroidizing reacion
Afterwards, molten iron surface scum is removed, when temperature reaches pouring condition, thermal-insulating covering agent is sprinkled on molten iron surface for measurement temperature.
During spheroidization and inoculation technique ladle-to-ladle using the evaporative pattern spheroidal graphite cast-iron of the invention provided, using dam-type nodularization bag, and
Nodularization oxidant layer, covering oxidant layer are set gradually from bottom to up in a side bottom of dykes and dams, cover plate, nodularization oxidant layer, are bred oxidant layer and are covered
Lid oxidant layer.Therefore, when adding molten iron progress spheroidizing reacion, due to the presence of inter panel, whole spheroidizing reacion is carried out in two times.
First time spheroidizing reacion first reacts for the nodulizer on cover plate upper strata, molten iron is absorbed a part of rare earth magnesium.With spheroidizing reacion
Carry out, cover plate gradually melts, and then after it melts, be arranged at the nodulizer below cover plate and start reaction, that is, second
Spheroidizing reacion.By way of spheroidizing reacion twice is carried out in succession, the time of spheroidizing reacion is extended, the suction of rare earth magnesium is improved
Yield.And then casting residual Re content of magnesium is improved, reduce later stage scaling loss, improve nodulizing grade, and then improve final casting
Quality.
In a preferred embodiment, when spheroidizing reacion starts rear 20-30s, second is sprinkled into nodularization bag and is bred
Agent, at the end of spheroidizing reacion is basic, is sprinkled into the 3rd inovulant in nodularization bag.Namely inovulant is added in three times,
For the first time to be covered in the first inovulant above nodularization oxidant layer, bred for the second time for spheroidizing reacion has just been initially added into second
Agent, the 3rd inovulant added for the third time for spheroidizing reacion at the end of.Pregnant effect is improved by three additions, delayed
The time of inoculation fade, reduce casting graphite is lopsided and non-spheroidal graphite graphite, be conducive to improving the quality of casting.
In order to reach above-mentioned second purpose, present invention also offers a kind of ladle-to-ladle spheroidization and inoculation work of evaporative pattern spheroidal graphite cast-iron
The nodularization bag of skill, including inclusion and the dykes and dams being arranged in the inclusion, the side bottom of dykes and dams one are set gradually from the bottom to top
There are nodularization oxidant layer, covering oxidant layer, cover plate, nodularization oxidant layer, first to breed oxidant layer and covering oxidant layer, the cover plate is rustless carbon steel
Plate or shaping magnesium iron plate or shaped steel plate.
Preferably, in above-mentioned nodularization bag, the side bottom of dykes and dams one is disposed with weight for weight of molten iron from the bottom to top
Covering oxidant layer, cover plate, the weight that 0.75%-0.85% nodularization oxidant layer, weight is weight of molten iron 0.05%-0.15% are molten iron
Weight 0.55%-0.65% nodularization oxidant layer, weight is the first of weight of molten iron 0.05%-0.15% to breed oxidant layer, weight and be
Weight of molten iron 0.05%-0.15% covering oxidant layer.
Preferably, in above-mentioned nodularization bag, the top surface of the cover plate is plane, the bag bottom shape of bottom shape and the nodularization bag
Shape is identical, and the cover plate top edge and the inwall surrounding gap of the inclusion are not more than 5mm.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
A kind of flow of embodiment of the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron that Fig. 1 provides for the present invention
Schematic diagram；
Nodularization bag one kind specific implementation in the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron that Fig. 2 provides for the present invention
The cross section structure diagram of mode；
Fig. 3 is the cross-sectional structure schematic diagram of Fig. 2 cover plates.
Marked in accompanying drawing as follows：
Nodularization oxidant layer 1, covering oxidant layer 2, cover plate 3, first breeds oxidant layer 4, nodularization bag 5, dykes and dams 6.
Embodiment
The embodiment of the invention discloses a kind of ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, to improve evaporative pattern production
The nodulizing grade of spheroidal graphite cast-iron, raising nodular iron casting quality, rate of reducing the number of rejects and seconds.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is embodied for ladle-to-ladle spheroidization and inoculation technique one kind of evaporative pattern spheroidal graphite cast-iron that the present invention is provided
The schematic flow sheet of mode.
In a kind of embodiment, the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron that provides of the present invention include with
Lower step：
S101：One layer of nodulizer is first set in the side bottom of dykes and dams one of dam-type nodularization bag, nodulizer surface sets one layer
Coverture is simultaneously consolidated, and cover plate is placed on coverture, and nodulizer, the first inovulant and coverture are sequentially placed on the cover board；
Namely nodularization oxidant layer, covering oxidant layer, cover plate, nodulizer are set gradually from the bottom to top in a side bottom of dykes and dams
Layer, oxidant layer and covering oxidant layer are bred, should be noted and consolidated when placing each layer.Using dam-type nodularization bag, note that it need to be kept
Containment wall is clean and tidy, and dykes and dams should specifically be higher by bag bottom 150-200mm.Nodularization bag is positioned over the other processing region in cast scene in case
With.Nodularization is assured after getting ready, and the molten iron that can treat spheroidising is removed the gred and pre-processed.
Specifically, the suitable electric furnace molten iron of composition can be warming up to 1560-1600 DEG C, being sprinkled into weight after the slagging-off of surface is
Weight of molten iron 0.05-0.15% carborundum pretreating agent, and it is incubated 9-11 minutes.Certainly, for a certain spheroidising,
The addition of carborundum pretreating agent should be the value of a determination, and the value falls in above-mentioned number range, can be specifically iron
The 0.1% of water weight.Its soaking time can also be set according to actual conditions, generally 9-11 minutes, such as 10 points of insulation
Clock etc., the formation of globular graphite can be effectively facilitated by the addition of pretreating agent.
Specific above-mentioned nodulizer, coverture, the composition of the first inovulant refer to prior art and combine actual electric furnace iron
The composition of water is configured, and cover plate is specifically as follows rustless carbon steel plate or shaping magnesium iron plate or shaped steel plate, and then can melt
In molten iron and it will not destroy its original composition.
It is possible to further by obtaining optimal spheroidising effect to the adjustment of above layers weight.Specifically,
The nodulizer that weight is weight of molten iron 0.75%-0.85%, ball can be first set in the side bottom of dykes and dams one of dam-type nodularization bag
Coverture and tamping of the agent surface covering weight for weight of molten iron 0.05%-0.15%, place cover plate, cover plate on coverture
On be sequentially placed weight be weight of molten iron 0.55%-0.65% nodulizer, that weight is weight of molten iron 0.05%-0.15%
One inovulant and the coverture that weight is weight of molten iron 0.05%-0.15%.Certainly, it is above-mentioned for a certain technological process
The weight of each layer should be the numerical value of a determination, and the value falls in above-mentioned number range.According to actual needs such as hot metal composition
Not equal factor is adjusted to above layers content, to meet real needs.Specifically, dam-type nodularization bag can be set
It is weight of molten iron 0.1% that the side bottom of dykes and dams one sets gradually the nodularization oxidant layer that weight is weight of molten iron 0.8%, weight from the bottom to top
Covering oxidant layer, cover plate, the nodularization oxidant layer that weight is weight of molten iron 0.6%, the first inovulant that weight is weight of molten iron 0.1%
Layer and the covering oxidant layer that weight is weight of molten iron 0.1%.
S102：The molten iron after scum silica frost pours into dam-type nodularization bag be not provided with nodulizer one will be removed in tundish
Side.
Prepare tundish in advance, first tundish can specifically be preheated, a certain amount of molten iron is poured into tundish
In, surface scum is scratched clean rapidly and is transported to spheroidising area.Reach behind spheroidising area, tundish progress is removed again floating
Slag, and the molten iron for meeting spheroidising condition is poured into the side for being not provided with nodulizer of dam-type nodularization bag, quickly pour.
In said process, specifically tundish first can be preheated to 500-700 DEG C with molten iron or natural gas.In the middle of then
Bag is transported to behind spheroidising area, tundish is carried out removing scum silica frost again, and carries out thermometric, when temperature is at 1530-1550 DEG C
When, molten iron is poured into nodularization bag.
Molten iron is poured into after nodularization bag, and first the nodulizer with cover plate upper strata reacts, with the progress of spheroidizing reacion, cover plate fusing
Afterwards, the nodulizer of lower floor further participates in spheroidizing reacion.Namely by cover plate by nodulizer be divided into above and below two parts, whole ball
Change reaction to carry out in two times, by way of spheroidizing reacion twice is carried out in succession, extend the time of spheroidizing reacion, improve dilute
The absorptivity of native magnesium.And then casting residual Re content of magnesium is improved, reduce later stage scaling loss, improve nodulizing grade, and then improve most
The quality of whole casting.
On the basis of above-described embodiment, inovulant addition, that is, set in nodularization bag by several times can be further set
The first inovulant is put, inovulant is then further added in follow-up spheroidizing reacion.Specifically, molten iron is poured into after nodularization bag,
When spheroidizing reacion starts rear 20-30s, it is second breeding for weight of molten iron 0.45%-0.55% that weight is sprinkled into nodularization bag
Agent, the 5-15s before spheroidizing reacion terminates, that is, at the end of spheroidizing reacion is basic, weight is sprinkled into nodularization bag for molten iron
The 0.25%-0.35% of weight the 3rd inovulant.Namely inovulant is added in three times, in the not same order of spheroidizing reacion
Section, adds different amounts of inovulant, improves pregnant effect, delays the time of inoculation fade.Specifically, being sprinkled into the second inovulant
Weight can be the 0.5% of weight of molten iron, and the weight of the 3rd inovulant is the 0.3% of weight of molten iron.It is arranged such, results in
Optimal pregnant effect.
According to the different phase of spheroidizing reacion, the inovulant of addition can carry out specifically chosen.Such as the selection of the first inovulant
Silicon iron inoculator, the second inovulant and the 3rd inovulant selection silico-calcium and silicon barium composite inoculant.Pass through above-mentioned different inovulants
Addition, actually combine requirement of the spheroidizing reacion different times to inovulant, also obtain optimal spheroidising effect.
The gradation addition of inovulant, the second inovulant can also specifically being poured, the current-following inoculation that taps a blast furnace is carried out in molten iron,
The molten iron poured carries out occurring inoculation(effect) while spheroidising.But it is basic with spheroidizing reacion by just having started in spheroidizing reacion
At the end of add the mode of inovulant respectively, more ensure that providing sufficient inovulant in spheroidizing reacion day part breeds
Effect, delays inoculation fade.
Further, after spheroidizing reacion terminates, molten iron surface scum is removed, measurement temperature treats that temperature reaches cast bar
During part, thermal-insulating covering agent is sprinkled on molten iron surface, and then carry out casting pouring.At namely to the molten iron after spheroidising
Reason obtains the casting of excellent performance to be poured into a mould.
By the above-mentioned ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, it can effectively extend the spheroidizing reacion time, make
Reaction time is improved to 90-120s by original 40s or so.Casting residual Re content can reach 0.015%-0.025%, residual
Remaining magnesium amount can reach 0.04%-0.05%, reach raising casting residual Re, the purpose of content of magnesium.And then can improve
Casting nodulizing grade, makes the nodulizing grade of casting more than 3 grades, sphere diameter size is more than 5 grades.To sum up, present invention offer is provided
The ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, traditional spheroidization and inoculation work when resulting in compared to using lost foam casting
Skill performance more excellent casting.
Present invention also offers a kind of nodularization bag of the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron.
Refer to Fig. 2 and Fig. 3, the nodularization for the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron that Fig. 2 provides for the present invention
Wrap a kind of cross section structure diagram of embodiment；Fig. 3 is the cross-sectional structure schematic diagram of Fig. 2 cover plates.
In a kind of embodiment, the nodularization for the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron that the present invention is provided
Include inclusion 5 and the dykes and dams 6 being arranged in inclusion 5.
Wherein, nodularization oxidant layer 1, covering oxidant layer 2, lid are set gradually from bottom to up in the side of the bottom of inclusion 5, dykes and dams 6
Plate 3, nodularization oxidant layer 1, first breed oxidant layer 4 and covering oxidant layer 2.Specifically, cover plate 3 can be rustless carbon steel plate or shaping ball
Iron plate or shaped steel plate, and then cover plate 3 can fuse into iron liquid and not destroy its original composition.That is, by centre
Cover plate 3 is set, and by nodularization oxidant layer, 1 point is two layers up and down, and the nodularization oxidant layer 1 positioned at the top of cover plate 3 is first reacted with iron liquid, and with
Cover plate 3 melts, and the nodularization oxidant layer 1 being disposed below can just further participate in spheroidizing reacion, thus spheroidizing reacion is divided into twice
Carry out, so as to extend the spheroidizing reacion time, it is possible to increase to 90-120s.And then casting residual Re content of magnesium is improved, reduce
Later stage scaling loss, improves nodulizing grade, and then improve the quality of final casting.
Specifically, dykes and dams 6 could be arranged to be higher by bag bottom 150-200mm, thus it is easy to set above layers structure.To obtain
Optimal spheroidising effect is obtained, the weight of above layers could be arranged to：Weight of molten iron 0.75%- is followed successively by from the bottom to top
0.85% nodularization oxidant layer 1, weight of molten iron 0.05%-0.15% covering oxidant layer 2, cover plate 3, weight of molten iron 0.55%-
0.65% nodularization oxidant layer 1, weight of molten iron 0.05%-0.15% breed oxidant layer 4, weight of molten iron 0.05%-0.15% are covered
Lid oxidant layer 2.Certainly, for a certain technique, the weight of each layer is set to should be the value of a determination, and the value is in above-mentioned numerical value
In the range of.It is specifically as follows：Set and to be followed successively by the nodularization oxidant layer 1 of weight of molten iron 0.8%, weight of molten iron 0.1% from the bottom to top
Covering oxidant layer 2, cover plate 3, the nodularization oxidant layer 1 of weight of molten iron 0.6%, weight of molten iron 0.1% breed oxidant layer 4, weight of molten iron
0.1% covering oxidant layer 2.
Further, to cause the placement of cover plate 3 more steady, and can progressively it be melted with the progress of spheroidizing reacion, can
To set the cross section of cover plate 3 as sector.Namely the top surface of cover plate 3 is plane, and the bottom surface of cover plate 3 is arc surface, and then is covered
Plate 3 can be good at coordinating with nodularization bag, and each lamination for being arranged at the lower section of cover plate 3 is real.The thickness of cover plate 3 could be arranged to
4.5-5.5mm, it is specifically as follows 5mm.For the cover plate of arc is in bottom surface, thickness herein refers to the maximum gauge of cover plate 3.
Certainly, for ease of processing, it is also contemplated that using flat cover plate, but it is inconsistent for the active force of the lower floor of cover plate 3.
Further, in order to obtain the optimal consolidation effect to the lower floor of cover plate 3, it is to avoid molten iron is not melting cover plate 3
It is the first haptoreaction of nodulizer 1 with lower floor to change, and the bottom shape of cover plate 3 can be set identical with the bag Bottom Shape of nodularization bag,
The top edge of cover plate 3 and the inwall surrounding gap of nodularization bag are not more than 5mm.Therefore, what cover plate 3 can be just is put into nodularization bag
It is interior, give full play to it and spheroidizing process is divided into effect twice.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.And for the pre- place of electric furnace molten iron
Increase and restriction to technical characteristics such as the processing of molten iron after reason, the restriction to the first inovulant, spheroidizing reacion terminate, Ke Yidan
Solely increase or limit one or more therein, the new technical scheme thus constituted also should be in the protection domain of the application.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, it is characterised in that including：
Step S1：One layer of nodulizer is first set in the side bottom of dykes and dams one of dam-type nodularization bag, set on the nodulizer surface
One layer of coverture is simultaneously consolidated, and cover plate is placed on the coverture, and nodulizer, the first inovulant are sequentially placed on the cover plate
And coverture, the cover plate is rustless carbon steel plate or shaping magnesium iron plate or shaped steel plate；
Step S2：The molten iron after scum silica frost pours into the dam-type nodularization bag be not provided with nodulizer one will be removed in tundish
Side.
2. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim 1, it is characterised in that the step S1
Specially：
In the side bottom of dykes and dams one of dam-type nodularization bag, the nodularization that one layer weight is weight of molten iron 0.75%-0.85% is first set
Agent, coverture and tamping of the layer weight for weight of molten iron 0.05%-0.15% are covered on the nodulizer surface, is covered described
It is weight of molten iron 0.55%-0.65% nodulizer, weight that placement on cover plate, the cover plate is placed in lid agent and is sequentially placed weight
The coverture for being weight of molten iron 0.05%-0.15% for weight of molten iron 0.05%-0.15% the first inovulant and weight.
3. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim 1, it is characterised in that the step S1
Also include step before：
Electric furnace molten iron is warming up to 1560-1600 DEG C, the carbonization that weight is weight of molten iron 0.05-0.15% is sprinkled into after the slagging-off of surface
Silicon pretreating agent, and it is incubated 9-11 minutes.
4. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim any one of 1-3, it is characterised in that institute
Stating also includes step after step S2：
When spheroidizing reacion starts rear 20-30s, it is the of weight of molten iron 0.45%-0.55% that weight is sprinkled into the nodularization bag
Two inovulants, the 5-15s before spheroidizing reacion terminates is sprinkled into weight for weight of molten iron 0.25%-0.35% in the nodularization bag
The 3rd inovulant.
5. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim 4, it is characterised in that be sprinkled into described
The weight of two inovulants is the 0.5% of weight of molten iron, and the weight of the 3rd inovulant is the 0.3% of weight of molten iron.
6. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim 4, it is characterised in that described first is pregnant
Agent is educated for silicon iron inoculator, and second inovulant and the 3rd inovulant are silico-calcium and silicon barium composite inoculant.
7. the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron according to claim 4, it is characterised in that also include：
After the spheroidizing reacion terminates, molten iron surface scum, measurement temperature, when temperature reaches pouring condition, on molten iron surface are removed
It is sprinkled into thermal-insulating covering agent.
8. a kind of nodularization bag of the ladle-to-ladle spheroidization and inoculation technique of evaporative pattern spheroidal graphite cast-iron, including inclusion and it is arranged in the inclusion
Dykes and dams, it is characterised in that the side bottom of dykes and dams one is disposed with nodularization oxidant layer, covering oxidant layer, cover plate, nodularization from the bottom to top
Oxidant layer, first breed oxidant layer and covering oxidant layer, and the cover plate is rustless carbon steel plate or shaping magnesium iron plate or shaped steel plate.
9. nodularization bag according to claim 8, it is characterised in that the side bottom of dykes and dams one is disposed with from the bottom to top
Covering oxidant layer that nodularization oxidant layer, the weight that weight is weight of molten iron 0.75%-0.85% are weight of molten iron 0.05%-0.15%,
Cover plate, weight are that weight of molten iron 0.55%-0.65% nodularization oxidant layer, weight are the first of weight of molten iron 0.05%-0.15%
Breed the covering oxidant layer that oxidant layer, weight are weight of molten iron 0.05%-0.15%.
10. nodularization bag according to claim 8, it is characterised in that the top surface of the cover plate is plane, bottom shape and institute
The bag Bottom Shape for stating nodularization bag is identical, and the cover plate top edge and the inwall surrounding gap of the inclusion are not more than 5mm.
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| CN107377902B (en) * | 2017-08-01 | 2019-02-15 | 浙江博星工贸有限公司 | The melting inoculated technology of engine cam |
| CN109371192A (en) * | 2018-10-25 | 2019-02-22 | 中车大连机车车辆有限公司 | Spheroidal graphite cast-iron pours nodulizing process and spheroidising packet |
| CN114130968A (en) * | 2021-10-29 | 2022-03-04 | 中钢集团邢台机械轧辊有限公司 | Method for improving yield of inoculation nodulizer of iron casting product |
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| US2873188A (en) * | 1956-02-10 | 1959-02-10 | Union Carbide Corp | Process and agent for treating ferrous materials |
| US4385030A (en) * | 1982-04-21 | 1983-05-24 | Foote Mineral Company | Magnesium ferrosilicon alloy and use thereof in manufacture of modular cast iron |
| CN102373361A (en) * | 2010-08-20 | 2012-03-14 | 沈阳福铝科技有限公司 | Method for extending initiation time of nodulizer, environment-friendly nodulizer and preparation method thereof |
| CN102000785A (en) * | 2010-11-30 | 2011-04-06 | 刘之增 | Covering technology of ladle nodulizer nodulized by pour-over process |
| CN102363198B (en) * | 2011-04-11 | 2013-08-28 | 中方阀业淅川制造有限公司 | Evaporative pattern casting method of nodular cast iron flywheel casing |
| CN103789605A (en) * | 2014-02-19 | 2014-05-14 | 恒天重工股份有限公司 | Manufacturing method of spheroidal graphite cast iron casting of wind power yaw variable-pitch device |
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