CN108436063A - A kind of production method of high-strength thick wall nodular iron casting even greatly - Google Patents
A kind of production method of high-strength thick wall nodular iron casting even greatly Download PDFInfo
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- CN108436063A CN108436063A CN201810417294.6A CN201810417294A CN108436063A CN 108436063 A CN108436063 A CN 108436063A CN 201810417294 A CN201810417294 A CN 201810417294A CN 108436063 A CN108436063 A CN 108436063A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of production methods of high-strength thick wall nodular iron casting even greatly, are related to spheroidal graphite cast-iron technical field.The present invention includes electromagnetic field design, moulding and coremaking, mould assembling casting, nodularization and inoculation and knockout, according to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity, it carries out filling type and solidification simulation in simulation software, to applying the magnetic field generated by alternating electric field in molten metal.The present invention is by way of electromagnetic casting constantly to applying electromagnetic stirring force appropriate in metal material forming process, control the distribution of grain size and element, to improve the intensity and performance of casting, and analogue simulation ensures that casting amount and electromagnetic force reach production requirement in advance, not only short molding cycle, the big wall casting strength height of thickness of production, surface are smooth, and without increasing noble metal, save production cost.
Description
Technical field
The invention belongs to spheroidal graphite cast-iron technical fields, more particularly to a kind of life of high-strength thick wall nodular iron casting even greatly
Production method.
Background technology
Spheroidal graphite cast-iron is a kind of high-strength cast iron material, and comprehensive performance is based on its excellent performance close to steel,
It has been successfully used to cast some stress complexity, the more demanding part of intensity, toughness, wearability.Spheroidal graphite cast-iron is sent out rapidly
Exhibition for be only second to gray cast iron, using very extensive cast iron materials.Spheroidal graphite cast-iron is to obtain ball by nodularization and inoculation
Shape graphite is effectively improved the mechanical performance of cast iron, in particular improves plasticity and toughness, also higher than carbon steel to obtain
Intensity.
In the ironcasting of spheroidal graphite cast-iron production, wall thickness is more than 300mm, and weight is called high-strength thick wall even greatly more than 5T's
Nodular iron casting, tensile strength require to be more than or equal to 550MPa, and pearlite is more than or equal to 90%.Its existing production method is：
Pearlite is promoted to generate in as cast condition acquisition high intensity by increasing alloy addition, and this mode for increasing noble metal can cause
Production cost is higher.
Invention content
The purpose of the present invention is to provide a kind of production methods of high-strength thick wall nodular iron casting even greatly, are cast by electromagnetism
The mode made constantly to applying electromagnetic stirring force appropriate in metal material forming process, controls point of grain size and element
Cloth, to improve the intensity and performance of casting, solving the existing mode for increasing noble metal can cause production cost is higher to ask
Topic.
The present invention is achieved by the following technical solutions：
The present invention be a kind of high-strength thick wall nodular iron casting even greatly production method, including electromagnetic field design, moulding and
Coremaking, mould assembling casting, nodularization and inoculation and knockout；
SS01 electromagnetic fields design
According to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity,
It carries out filling type and solidification simulation in simulation software, to applying the magnetic field generated by alternating electric field in molten metal, according to electromagnetism
Principle of induction is passed through alternating current in induction coil, and the identical induction of frequency will be induced in the conductor for being put into coil
Electric current generates Lorentz force due to the interaction in eddy current and magnetic field, and Lorentz force generates constraint to melt and changes it
Form controls Lorentz force by controlling electric current in simulations, obtain cavity filling process molten iron flow condition whether have it is disorderly
Stream, sand washing situation and fills the temperature change of the complete process of setting of type, the place that shrinkage defect occurs, while being observed by analogue simulation
Phase transition process in metal liquid solidification process confirms temperature of the basic body transforms at pearlite, after confirming shake temperature and knockout
Intensity of cooling；
SS02 moulding and coremaking
According to simulation swaging die molded dimension molding and core making, and induction coil is arranged outside cavity, required according to casting technique
Placement Quench chill at casting thick and large section is corresponded in casting mold, cast top places feeding head；
SS03 mould assembling is cast
Core is combined to and is waited for casting, furnace charge is added in stove and melt simultaneously thermometric, waits the fusing of furnace charges
Temperature rises to casts at 1440 DEG C~1460 DEG C, to ensure before casting bits in molten iron remove it is clean, when casting
Alternating current is led to induction coil, it is identical when current control is with analogue simulation, it is powered off after molding completely of casting；
SS04 nodularizations and inoculation
Nodulizer and 1/3 inovulant are first proportionally added into the one side at ladle bottom, first ball adding agent adds inovulant simultaneously again
Tamping, it should be the another side for placing the materials such as alloy that molten iron, which pours position, prevent molten iron from directly impacting alloy, first go out 2/3 iron
Water polo, after spheroidizing reacion, then go out remaining 1/3 molten iron, remaining 2/3 inovulant is uniformly added into molten iron and by molten iron
It stirs evenly；
SS05 knockouts
It after the completion of nodularization and inoculation, is cooled down in core, casting mean temperature drops to 700 DEG C~750
DEG C when carry out knockout, make casting be completely exposed in air by it is normal it is air-cooled in a manner of cooled down, finally by casting in sand
Put forward to carry out air-cooled, is cleared up again after casting is completely cooling and complete casting.
Further, the core is formed using furan resin-sand material manufacture.
Further, the nodulizer selects rare earth ferrosilicomagnesium nodulizer FeSiMg8Re7, and addition is 1.6%~
2.0%, nodulizer pounds into the bulk of 5~25cm, and keeps clean, dry, and silicon content is high in alloy, can significantly reduce magnesium
Vigorous reaction degree, can also have certain inoculation(effect), and due to the not phase chemical combination of the tension-active element in magnesium and magnesium iron, rare earth
Element Re can neutralize tension-active element, to offset interference.
Further, it is 0.8%~1.0% that the inovulant, which selects FeSi75, addition, and inovulant pounds into 5~25cm
Bulk, and keep clean, dry.
Further, the height of the nodularization packet and diameter ratio are 2:1, in order to improve the absorptivity of nodulizer, increase ball
Change effect.
The invention has the advantages that：
The present invention is by way of electromagnetic casting constantly to applying electromagnetic agitation appropriate in metal material forming process
Power controls the distribution of grain size and element, and to improve the intensity and performance of casting, and analogue simulation ensures to cast in advance
Amount and electromagnetic force reach production requirement, not only short molding cycle, and wall casting strength is high greatly, surface is smooth for the thickness of production, and nothing
Noble metal need to be increased, save production cost.
Specific implementation mode
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
All other embodiment that art personnel are obtained without creative efforts belongs to the model that the present invention protects
It encloses.
Embodiment one
SS01 electromagnetic fields design
According to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity,
It carries out filling type and solidification simulation in simulation software, to applying the magnetic field generated by alternating electric field in molten metal, according to electromagnetism
Principle of induction is passed through alternating current in induction coil, and the identical induction of frequency will be induced in the conductor for being put into coil
Electric current generates Lorentz force due to the interaction in eddy current and magnetic field, and Lorentz force generates constraint to melt and changes it
Form controls Lorentz force by controlling electric current in simulations, obtain cavity filling process molten iron flow condition whether have it is disorderly
Stream, sand washing situation and fills the temperature change of the complete process of setting of type, the place that shrinkage defect occurs, while being observed by analogue simulation
Phase transition process in metal liquid solidification process confirms temperature of the basic body transforms at pearlite, after confirming shake temperature and knockout
Intensity of cooling；
SS02 moulding and coremaking
According to simulation swaging die molded dimension molding and core making, and induction coil is arranged outside cavity, required according to casting technique
Placement Quench chill at casting thick and large section is corresponded in casting mold, cast top places feeding head；
SS03 mould assembling is cast
Core is combined to and is waited for casting, furnace charge is added in stove and melt simultaneously thermometric, waits the fusing of furnace charges
Temperature rises to casts at 1460 DEG C, to ensure before casting bits in molten iron remove it is clean, to the line of induction when casting
Circle leads to alternating current, identical when current control is with analogue simulation, is powered off after molding completely of casting；
SS04 nodularizations and inoculation
Nodulizer and 1/3 inovulant are first proportionally added into the one side at ladle bottom, first ball adding agent adds inovulant simultaneously again
Tamping, it should be the another side for placing the materials such as alloy that molten iron, which pours position, prevent molten iron from directly impacting alloy, first go out 2/3 iron
Water polo, after spheroidizing reacion, then go out remaining 1/3 molten iron, remaining 2/3 inovulant is uniformly added into molten iron and by molten iron
It stirs evenly；
SS05 knockouts
It after the completion of nodularization and inoculation, is cooled down in core, casting mean temperature carries out when dropping to 750 DEG C
Knockout, make casting be completely exposed in air by it is normal it is air-cooled in a manner of cooled down, finally casting is put forward in sand into
Row is air-cooled, is cleared up again after casting is completely cooling and completes casting.
Wherein, core is formed using furan resin-sand material manufacture.
Wherein, nodulizer selects rare earth ferrosilicomagnesium nodulizer FeSiMg8Re7, and addition 2.0%, nodulizer pounds into 5cm
Bulk, and keep clean, dry, silicon content is high in alloy, can significantly reduce the vigorous reaction degree of magnesium, can also have
Certain inoculation(effect), and since phase chemical combination, rare earth element Re can not neutralize anti-nodularization member to the tension-active element in magnesium and magnesium iron
Element, to offset interference.
Wherein, inovulant selects FeSi75, addition 1.0%, inovulant to pound into the bulk of 25cm, and keep it is clean,
It is dry.
Wherein, the height of nodularization packet and diameter ratio are 2:1, in order to improve the absorptivity of nodulizer, increase nodularization effect.
Embodiment two
SS01 electromagnetic fields design
According to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity,
It carries out filling type and solidification simulation in simulation software, to applying the magnetic field generated by alternating electric field in molten metal, according to electromagnetism
Principle of induction is passed through alternating current in induction coil, and the identical induction of frequency will be induced in the conductor for being put into coil
Electric current generates Lorentz force due to the interaction in eddy current and magnetic field, and Lorentz force generates constraint to melt and changes it
Form controls Lorentz force by controlling electric current in simulations, obtain cavity filling process molten iron flow condition whether have it is disorderly
Stream, sand washing situation and fills the temperature change of the complete process of setting of type, the place that shrinkage defect occurs, while being observed by analogue simulation
Phase transition process in metal liquid solidification process confirms temperature of the basic body transforms at pearlite, after confirming shake temperature and knockout
Intensity of cooling；
SS02 moulding and coremaking
According to simulation swaging die molded dimension molding and core making, and induction coil is arranged outside cavity, required according to casting technique
Placement Quench chill at casting thick and large section is corresponded in casting mold, cast top places feeding head；
SS03 mould assembling is cast
Core is combined to and is waited for casting, furnace charge is added in stove and melt simultaneously thermometric, waits the fusing of furnace charges
Temperature rises to casts at 1445 DEG C, to ensure before casting bits in molten iron remove it is clean, to the line of induction when casting
Circle leads to alternating current, identical when current control is with analogue simulation, is powered off after molding completely of casting；
SS04 nodularizations and inoculation
Nodulizer and 1/3 inovulant are first proportionally added into the one side at ladle bottom, first ball adding agent adds inovulant simultaneously again
Tamping, it should be the another side for placing the materials such as alloy that molten iron, which pours position, prevent molten iron from directly impacting alloy, first go out 2/3 iron
Water polo, after spheroidizing reacion, then go out remaining 1/3 molten iron, remaining 2/3 inovulant is uniformly added into molten iron and by molten iron
It stirs evenly；
SS05 knockouts
After the completion of nodularization and inoculation, cooled down in core, when casting mean temperature drops to 7400 DEG C into
Row knockout, make casting be completely exposed in air by it is normal it is air-cooled in a manner of cooled down, finally casting is put forward in sand
It carries out air-cooled, is cleared up again after casting is completely cooling and complete casting.
Wherein, core is formed using furan resin-sand material manufacture.
Wherein, nodulizer selects rare earth ferrosilicomagnesium nodulizer FeSiMg8Re7, and addition 1.6%, nodulizer pounds into 5cm
Bulk, and keep clean, dry, silicon content is high in alloy, can significantly reduce the vigorous reaction degree of magnesium, can also have
Certain inoculation(effect), and since phase chemical combination, rare earth element Re can not neutralize anti-nodularization member to the tension-active element in magnesium and magnesium iron
Element, to offset interference.
Wherein, inovulant selects FeSi75, and addition 0.8%, inovulant pounds into the bulk of 5cm, and keeps clean, dry
It is dry.
Wherein, the height of nodularization packet and diameter ratio are 2:1, in order to improve the absorptivity of nodulizer, increase nodularization effect.
Embodiment three
SS01 electromagnetic fields design
According to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity,
It carries out filling type and solidification simulation in simulation software, to applying the magnetic field generated by alternating electric field in molten metal, according to electromagnetism
Principle of induction is passed through alternating current in induction coil, and the identical induction of frequency will be induced in the conductor for being put into coil
Electric current generates Lorentz force due to the interaction in eddy current and magnetic field, and Lorentz force generates constraint to melt and changes it
Form controls Lorentz force by controlling electric current in simulations, obtain cavity filling process molten iron flow condition whether have it is disorderly
Stream, sand washing situation and fills the temperature change of the complete process of setting of type, the place that shrinkage defect occurs, while being observed by analogue simulation
Phase transition process in metal liquid solidification process confirms temperature of the basic body transforms at pearlite, after confirming shake temperature and knockout
Intensity of cooling；
SS02 moulding and coremaking
According to simulation swaging die molded dimension molding and core making, and induction coil is arranged outside cavity, required according to casting technique
Placement Quench chill at casting thick and large section is corresponded in casting mold, cast top places feeding head；
SS03 mould assembling is cast
Core is combined to and is waited for casting, furnace charge is added in stove and melt simultaneously thermometric, waits the fusing of furnace charges
Temperature rises to casts at 1450 DEG C, to ensure before casting bits in molten iron remove it is clean, to the line of induction when casting
Circle leads to alternating current, identical when current control is with analogue simulation, is powered off after molding completely of casting；
SS04 nodularizations and inoculation
Nodulizer and 1/3 inovulant are first proportionally added into the one side at ladle bottom, first ball adding agent adds inovulant simultaneously again
Tamping, it should be the another side for placing the materials such as alloy that molten iron, which pours position, prevent molten iron from directly impacting alloy, first go out 2/3 iron
Water polo, after spheroidizing reacion, then go out remaining 1/3 molten iron, remaining 2/3 inovulant is uniformly added into molten iron and by molten iron
It stirs evenly；
SS05 knockouts
It after the completion of nodularization and inoculation, is cooled down in core, casting mean temperature carries out when dropping to 730 DEG C
Knockout, make casting be completely exposed in air by it is normal it is air-cooled in a manner of cooled down, finally casting is put forward in sand into
Row is air-cooled, is cleared up again after casting is completely cooling and completes casting.
Wherein, core is formed using furan resin-sand material manufacture.
Wherein, nodulizer selects rare earth ferrosilicomagnesium nodulizer FeSiMg8Re7, and addition 1.8%, nodulizer is pounded into
The bulk of 25cm, and keep clean, dry, silicon content is high in alloy, can significantly reduce the vigorous reaction degree of magnesium, also can
With certain inoculation(effect), and since phase chemical combination, rare earth element Re can not neutralize anti-ball to the tension-active element in magnesium and magnesium iron
Change element, to offset interference.
Wherein, inovulant selects FeSi75, addition 0.9%, inovulant to pound into the bulk of 20cm, and keep it is clean,
It is dry.
Wherein, the height of nodularization packet and diameter ratio are 2:1, in order to improve the absorptivity of nodulizer, increase nodularization effect.
Claims (5)
1. a kind of production method of high-strength thick wall nodular iron casting even greatly, it is characterised in that：Including electromagnetic field design, moulding and
Coremaking, mould assembling casting, nodularization and inoculation and knockout；
SS01 electromagnetic fields design
According to the good cavity version of thickness wall nodular iron casting size design even greatly and size, to arranging induction coil outside cavity, imitative
It carries out filling type and solidification simulation in true software, to applying the magnetic field generated by alternating electric field in molten metal, according to electromagnetic induction
Principle is passed through alternating current in induction coil, and the identical induced current of frequency will be induced in the conductor for being put into coil,
Lorentz force is generated due to the interaction in eddy current and magnetic field, Lorentz force generates constraint to melt and changes its form,
Lorentz force is controlled by controlling electric current in simulations, whether the flow condition for obtaining cavity filling process molten iron has turbulent flow, punching
It sand situation and fills the temperature change of the complete process of setting of type, the place that shrinkage defect occurs, while metal is observed by analogue simulation
Phase transition process in liquid process of setting confirms temperature of the basic body transforms at pearlite, to confirm shake temperature and knockout postcooling
Intensity；
SS02 moulding and coremaking
According to simulation swaging die molded dimension molding and core making, and induction coil is arranged outside cavity, require casting according to casting technique
Placement Quench chill at casting thick and large section is corresponded in type, cast top places feeding head；
SS03 mould assembling is cast
Core is combined to and is waited for casting, furnace charge is added in stove and melt simultaneously thermometric, waits the fusion temperature of furnace charges
Rise to and cast at 1440 DEG C~1460 DEG C, to ensure before casting bits in molten iron remove it is clean, to sense when casting
Coil is answered to lead to alternating current, it is identical when current control is with analogue simulation, it is powered off after molding completely of casting；
SS04 nodularizations and inoculation
Nodulizer and 1/3 inovulant are first proportionally added into the one side at ladle bottom, first ball adding agent adds inovulant and consolidates again,
It should be the another side for placing the materials such as alloy that molten iron, which pours position, prevent molten iron from directly impacting alloy, first go out 2/3 molten iron ball
Change, after spheroidizing reacion, then go out remaining 1/3 molten iron, remaining 2/3 inovulant is uniformly added into molten iron and stirs molten iron
Uniformly；
SS05 knockouts
It after the completion of nodularization and inoculation, is cooled down in core, when casting mean temperature drops to 700 DEG C~750 DEG C
Carry out knockout, make casting be completely exposed in air by it is normal it is air-cooled in a manner of cooled down, finally casting is proposed in sand
It is air-cooled to carry out, it is cleared up again after casting is completely cooling and completes casting.
2. a kind of production method of high-strength thick according to claim 1 wall nodular iron casting even greatly, it is characterised in that：Institute
Core is stated to form using furan resin-sand material manufacture.
3. a kind of production method of high-strength thick according to claim 1 wall nodular iron casting even greatly, it is characterised in that：Institute
Nodulizer selection rare earth ferrosilicomagnesium nodulizer FeSiMg8Re7 is stated, addition is 1.6%~2.0%, and nodulizer pounds into 5~25cm
Bulk, and keep clean, dry.
4. a kind of production method of high-strength thick according to claim 1 wall nodular iron casting even greatly, it is characterised in that：Institute
Inovulant selection FeSi75 is stated, addition is 0.8%~1.0%, and inovulant pounds into the bulk of 5~25cm, and keeps clean, dry
It is dry.
5. a kind of production method of high-strength thick according to claim 1 wall nodular iron casting even greatly, it is characterised in that：Institute
It is 2 to state the height of nodularization packet and diameter ratio:1, in order to improve the absorptivity of nodulizer, increase nodularization effect.
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| CN201810417294.6A CN108436063A (en) | 2018-05-04 | 2018-05-04 | A kind of production method of high-strength thick wall nodular iron casting even greatly |
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