CN103736933B - A kind of cast steel meltability is metal-cored and preparation and application - Google Patents
A kind of cast steel meltability is metal-cored and preparation and application Download PDFInfo
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- CN103736933B CN103736933B CN201310719277.5A CN201310719277A CN103736933B CN 103736933 B CN103736933 B CN 103736933B CN 201310719277 A CN201310719277 A CN 201310719277A CN 103736933 B CN103736933 B CN 103736933B
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Abstract
The invention discloses that a kind of cast steel meltability is metal-cored and preparation and application, the material of cast steel core is fine aluminium or the alusil alloy of siliceous weight fraction 0 13%, and the metal-cored fusing point of described meltability is 570 660 DEG C；Preparation method includes cast blank, cleaning and finishing, the coating step such as coating and preheating；Using method includes preheating, mould assembly cast, fusible core or the step such as depoling, recovery core material；It is an advantage of the current invention that: core material can recycle, coremaking low cost, intensity is high, and steel-casting quality is high.
Description
Technical field
The present invention relates to a kind of casting core, specifically a kind of cast steel meltability is metal-cored and prepares and uses
Method, it is adaptable to various casting carbon steels and cast alloy steel core, belongs to casting core field.
Background technology
In the Foundry Production of existing steel-casting, be typically all and use core to form the inner chamber of steel-casting, the profile of core with
The cavity shape to be formed is consistent.The material of existing cast steel core the most all includes refractory material, binding agent.Refractory material
Based on quartz sand, chromite sand, limestone sand, binding agent have resin, waterglass, vegetable oil, dextrin etc..The system of this core
The method of making is by after sand and binding agent mix homogeneously, at core (being also core box) internal shaping, obtains certain intensity after solidification, its
Room temperature tensile intensity typically only has 1-10MPa；Its using method is, by the preheating of cast steel core or does not preheats, puts into casting mold, water
Core, after casting forming, is destroyed by note molten steel so that it is flow out the cavity of steel-casting.The material of these cores does not typically reclaim, as
Really utilization and recycle, its cost is the highest.For the core of complicated inner cavity, it is therefrom cleaned out highly difficult, often have the grains of sand to remain.
The problem of this cast steel core is:
(1) scab defect easily occurs: owing to the heat conductivity of refractory material is little, after molten steel contact core, the table of core
Face is brought rapidly up, the high temperature the most close with molten steel.At these high temperatures, refractory material just softens, and occurs and steel
The phenomenon of part adhesion, i.e. scab defect；
(2) intensity is low, fragile: owing to cohesive force is limited, and its room temperature strength is relatively low, general only several MPa, is even less than
1MPa, is easily damaged or occurs drop phenomenon during carrying, installation etc., add cast steel part defect incidence rate；
(3) anti-metal liquid scouring capability is poor: once have high-temperature liquid metal directly to wash away, be easy for being rushed across, drop occurs
Or defeated and dispersed, cause foundry goods to be scrapped；
(4) clear up and reclaim difficulty: owing to the material of core is the mixture of binding agent and refractory material, even across high temperature
The effect of molten steel, it is also difficult to the most defeated and dispersed, not only clears up difficulty, and is difficult to recycle.Cause bigger solid waste and waste liquid
Pollute；
(5) pollute environment: owing to its refractory material mostly is dystectic oxide, it is difficult to degraded, after discharge, form solid waste
Polluting, its dust is easily caused anthraco-silicosis；Binding agent therein is Organic substance, produces waste gas even toxic gas after burning,
Cause exhaust emission
(6) casting quality is poor: due to the poor thermal conductivity of this core, the cooling making foundry goods is slow, and coarse grains, performance is not
High.
Summary of the invention
In order to solve in above-mentioned prior art that the above-mentioned intensity of cast steel core is low, anti-metal liquid scouring capability is poor, be difficult to reclaim
Utilize, the serious problem of environmental pollution, the present invention devises that a kind of cast steel meltability is metal-cored and preparation and application,
According to heat-conduction principle, utilizing the alusil alloy of high-strength and high ductility to make cast steel core, core material can recycle, and coremaking becomes
This is low, and intensity is high, and steel-casting quality is high.
The technical scheme is that
The metal-cored i.e. cast steel core of a kind of cast steel meltability, the metal-cored material of described meltability is siliceous weight fraction 0-
The fine aluminium of 13% or alusil alloy, different according to silicone content, the metal-cored fusing point of described meltability is 570-660 DEG C.Described can
The metal-cored preferably siliceous weight fraction of fusibleness is the alusil alloy of 6-8%.
This core material heat conductivity is good, and can absorb substantial amounts of heat when fusing, therefore, when the cast steel material of liquid will casting
During steel core parcel, cast steel core absorbs the most rapidly substantial amounts of heat, and transmits to core inner, therefore, though the temperature of core has raised, but
Do not have again fusing；The cast steel material temperature correspondingly contacted with core is rapidly reduced to below fusing point, solidifies, obtains group
Knit tiny fine and close solidification layer.
Further, the metal-cored shape of described meltability is consistent with steel-casting cavity shape to be shaped, and in institute
Core print is left in the end stating core, it is ensured that be arranged in casting mold by cast steel core to firm stable.
Further, the cross-sectional area that described meltability is metal-cored with surround the transversal of the metal-cored steel-casting of this meltability
Area ratio is 0.5-1.5: 1, preferably 1: 1.When this ratio is less than 0.5, before steel-casting solidifies, the temperature of cast steel core
Fusing point will be increased to be melted；When the cross-sectional area of cast steel core is more than 1.5 with the ratio of the steel-casting cross-sectional area surrounding core,
The cooling capacity of core is too strong, causes steel-casting cold shut or cracking defect easily occur.
The metal-cored i.e. cast steel core of above-mentioned cast steel meltability can use lost-foam casting method, metal mould cast method or
Person's Castingother method monolithic molding, it is also possible to reclaim cast steel core of the present invention as raw material, concrete manufacture method, including as follows
Step:
(1) cast blank: insert in smelting furnace by the cast steel core of recovery, makes temperature reach above 80-120 DEG C of its fusing point
Temperature, uses lost-foam casting method, metal mould cast method or Castingother method cast form, obtains cast steel core hair
Base, wherein, the cast moulding method such as lost-foam casting method, metal mould cast method is conventional method, does not repeats them here；
(2) cleaning and finishing: the cast gate on removal step (1) cast steel core blank and burr, and its surface is carried out
Bright and clean process so that it is surface smoothness rank is higher than the surface smoothness of steel-casting inner chamber 1 grade；
(3) coating coating: surface-coated silica flour of the prior art or zirconium English powder cast steel to step (2) cast steel core are coated with
Material, thickness of coating layer is 0.1-0.5mm.This coating both can play heat-blocking action, can play again the work of isolated core and steel-casting
With, prevent the material of core from diffusing in steel-casting.
(4) preheating: the cast steel core that step (3) is coated with coating is heated to 120-350 DEG C of insulation more than 20min, makes
Moisture content in cast steel wicking surface coating and volatile matter volatilization, obtain the cast steel core of the present invention.
The using method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, specifically includes following steps:
(1) will be preheated to require temperature i.e. to preheat that the cast steel core that temperature is 120-350 DEG C puts into casting mold, cast steel core end
Core print be arranged in the corresponding core print seat of casting mold；
(2) mould assembly cast: being closed by casting mold, liquid cast steel material pours in casting mold, wraps the cast steel core of the present invention,
Under the cooling effect of cast steel core, cast steel material cooled and solidified shapes, and the temperature of cast steel core raises simultaneously, but melting less than cast steel core
Point；Subsequently, along with cooling of steel-casting, cast steel core is also with cooling；
(3) fusible core or depoling: the steel-casting that solidification completes, is wrapped in cast steel core takes out from casting mold, puts into heat treatment
Carrying out 800-1100 DEG C of insulation in stove, make cast steel core melt and flow out the inner chamber of steel-casting, the steel-casting having taken off cast steel core enters again
Row annealing or normalizing heat treatment；
(4) reclaim core material: collected by the cast steel core material flowed out in steel-casting, be transferred to melt in stove, be heated to
700-800 DEG C, cast steel core is prepared in cast again.
The most repeatedly, the cast steel core needed for steel-casting can continuously be prepared without increasing core material consumption.
It is an advantage of the current invention that:
(1) core material can recycle: the cast steel core material of the present invention is fine aluminium or alusil alloy, and this material can be
The process of steel-casting annealing or normalizing heat treatment melts automatically, collects the most recyclable, Reusability；
(2) coremaking low cost: the coremaking cost of the present invention is mainly insulation melting and the electricity of casting core process of alusil alloy
Consumption is with artificial.Owing to fusible core is Tong Bu with steel-casting heat treatment, under mass production environment, cast steel core is in Steel Castings cost
Ratio suitable with resin sand core.
(3) intensity is high, and gained inner chamber size is accurate；The tensile strength of cast steel core of the present invention is the decades of times of existing core,
Up to more than 100MPa, even if at high temperature its tensile strength is also up to about 10MPa, therefore, it is unlikely to deform, erosion resistibility
By force, gained steel-casting inner chamber is bright and clean, size is accurate；
(4) steel-casting quality is high: the cast steel core alusil alloy of the present invention is made, and its heat conductivity is good, beneficially steel-casting
Crystal grain thinning and dense structure；Owing to cast steel core of the present invention not having sand grains, drop danger and burning into sand defect are eradicated.
Detailed description of the invention
Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Except as otherwise noted, the percent employed in the present invention is percetage by weight.
Embodiment 1
Casting carbon steel valve core
The inner chamber of cast steel valve needs to use core to carry out cast form, and prior art uses core to be formed, the reality of the present invention
Execute example to be used to cast carbon steel (ZG270-500) valve.
The metal-cored i.e. cast steel core of a kind of cast steel meltability, the metal-cored alusil alloy for silicon content 0% of described meltability,
I.e. fine aluminium, its fusing point 660 DEG C.This core material heat conductivity is good, and can absorb substantial amounts of heat, therefore, when liquid when fusing
When cast steel core is wrapped up by cast steel material, cast steel core absorbs the most rapidly substantial amounts of heat, and transmits to core inner, therefore, and the temperature of core
Though having raised, but do not have fusing；The cast steel material temperature correspondingly contacted with core is rapidly reduced to below fusing point, sends out
Raw solidification, obtains fine microstructures densification solidification layer.
The metal-cored shape of described meltability is consistent with steel-casting cavity shape to be shaped, and in the end of described core
Leave core print, it is ensured that be arranged in casting mold by cast steel core to firm stable.
The ratio of the cross-sectional area of the steel-casting that the metal-cored cross-sectional area of described meltability is metal-cored with surrounding this meltability
It is 1: 1.
The preparation method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, with the cast steel core of the present invention that reclaims as raw material,
Concrete manufacture method, comprises the steps:
(1) cast blank: the cast steel core (aluminum) reclaimed is inserted in smelting furnace so that it is temperature reaches more than its fusing point 80 DEG C
Temperature, use lost-foam casting method cast form, obtain cast steel core blank；
(2) cleaning and finishing: remove the cast gate on cast steel core blank and burr, and its surface is carried out bright and clean place
Reason so that it is surface smoothness rank is higher than the surface smoothness of steel-casting inner chamber 1 grade；
(3) coating coating: the surface-coated silica flour of the prior art steel moulder's paint to cast steel core, thickness of coating layer is
0.1mm.This coating both can play heat-blocking action, can play again the effect of isolated core and steel-casting, prevents the material of core from spreading
Enter in steel-casting.
(4) preheating: the cast steel core being coated with coating is heated to 350 DEG C of insulation 20min, makes in cast steel wicking surface coating
Moisture content and volatile matter volatilization, obtain the cast steel core of the present invention.
The using method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, specifically includes following steps:
(1) requiring that casting mold put into by the core of temperature 120-350 DEG C by being preheated to, the core print of cast steel core end is arranged on casting mold
Corresponding core print seat in；
(2) mould assembly cast: being closed by casting mold, liquid cast steel material pours in casting mold, wraps the cast steel core of the present invention,
Under the cooling effect of cast steel core, cast steel material cooled and solidified shapes, and the temperature of cast steel core raises simultaneously, but melting less than cast steel core
Point；Subsequently, along with cooling of steel-casting, cast steel core is also with cooling；
(3) fusible core or depoling: the steel-casting that solidification completes, is wrapped in cast steel core takes out from casting mold, puts into heat treatment
Carrying out 800 DEG C of insulations in stove, make cast steel core melt and flow out the inner chamber of steel-casting, the steel-casting having taken off core carries out the normalizing of requirement
Or annealing heat treatment.
(4) reclaim core material: collected by the core material flowed out in steel-casting, be transferred to melt in stove, be heated to 800
DEG C, cast steel core is prepared in cast again.
The most repeatedly, the cast steel core needed for steel-casting can continuously be prepared without increasing core material consumption.
Embodiment 2
Casting potassium steel part core
The hole of potassium steel part or inner chamber need to use core to carry out cast form, and prior art uses sodium silicate sand core to be formed,
Embodiments of the invention are used to cast potassium steel (Z6Mn13) part.
The metal-cored i.e. cast steel core of a kind of cast steel meltability, the metal-cored aluminum silicon for silicon content 13% of described meltability closes
Gold, its fusing point 577 DEG C.This core material heat conductivity is good, and can absorb substantial amounts of heat, therefore, when the cast steel of liquid when fusing
When cast steel core is wrapped up by material, cast steel core absorbs the most rapidly substantial amounts of heat, and transmits to core inner, therefore, though the temperature of core has
Raised, but do not had fusing；The cast steel material temperature correspondingly contacted with core is rapidly reduced to below fusing point, occurs solidifying
Gu, obtain fine microstructures densification solidification layer.
The metal-cored shape of described meltability is consistent with steel-casting cavity shape to be shaped, and in the end of described core
Leave core print, it is ensured that be arranged in casting mold by cast steel core to firm stable.
The ratio of the cross-sectional area of the steel-casting that the metal-cored cross-sectional area of described meltability is metal-cored with surrounding this meltability
It is 0.5: 1.
The preparation method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, with the cast steel core of the present invention that reclaims as raw material,
Concrete manufacture method, comprises the steps:
(1) cast blank: the cast steel core of recovery is inserted in smelting furnace so that it is temperature reaches more than its fusing point 120 DEG C
Temperature, uses lost-foam casting method cast form, obtains cast steel core blank；
(2) cleaning and finishing: remove the cast gate on cast steel core blank and burr, and its surface is carried out bright and clean place
Reason so that it is surface smoothness rank is higher than the surface smoothness of steel-casting inner chamber 1 grade；
(3) coating coating: the surface-coated silica flour of the prior art steel moulder's paint to cast steel core, thickness of coating layer is
0.3mm, this coating both can play heat-blocking action, can play again the effect of isolated core and steel-casting, prevented the material of core from spreading
Enter in steel-casting.
(4) preheating: the cast steel core being coated with coating is heated to 260 DEG C of insulation 40min, makes in cast steel wicking surface coating
Moisture content and volatile matter volatilization, obtain the cast steel core of the present invention.
The using method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, specifically includes following steps:
(1) requiring that casting mold put into by the core of temperature 120-350 DEG C by being preheated to, the core print of cast steel core end is arranged on casting mold
Corresponding core print seat in；
(2) mould assembly cast: being closed by casting mold, liquid cast steel material pours in casting mold, wraps the cast steel core of the present invention,
Under the cooling effect of cast steel core, cast steel material cooled and solidified shapes, and the temperature of cast steel core raises simultaneously, but melting less than cast steel core
Point；Subsequently, along with cooling of steel-casting, cast steel core is also with cooling；
(3) fusible core or depoling: the steel-casting that solidification completes, is wrapped in cast steel core takes out from casting mold, puts into heat treatment
Carrying out 1100 DEG C of insulations in stove, make cast steel core melt and flow out the inner chamber of steel-casting, the steel-casting having taken off core carries out the water of requirement
Tough heat treatment.
(4) reclaim core material: collected by the core material flowed out in steel-casting, be transferred to melt in stove, be heated to 700
DEG C, cast steel core is prepared in cast again.
The most repeatedly, the cast steel core needed for steel-casting can continuously be prepared without increasing core material consumption.
Embodiment 3
Cast stainless steel
The hole of cast stainless steel or inner chamber need to use core to carry out cast form, and prior art uses resin sand core to be formed,
Embodiments of the invention are used to cast stainless steel part.
The metal-cored i.e. cast steel core of a kind of cast steel meltability, the metal-cored aluminum silicon for silicon content 6.5% of described meltability closes
Gold, its fusing point 620 DEG C.This core material heat conductivity is good, and can absorb substantial amounts of heat, therefore, when the cast steel of liquid when fusing
When cast steel core is wrapped up by material, cast steel core absorbs the most rapidly substantial amounts of heat, and transmits to core inner, therefore, though the temperature of core has
Raised, but do not had fusing；The cast steel material temperature correspondingly contacted with core is rapidly reduced to below fusing point, occurs solidifying
Gu, obtain fine microstructures densification solidification layer.
The metal-cored shape of described meltability is consistent with steel-casting cavity shape to be shaped, and in the end of described core
Leave core print, it is ensured that be arranged in casting mold by cast steel core to firm stable.
The ratio of the cross-sectional area of the steel-casting that the metal-cored cross-sectional area of described meltability is metal-cored with surrounding this meltability
It is 1.5: 1.
The preparation method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, with the cast steel core of the present invention that reclaims as raw material,
Concrete manufacture method, comprises the steps:
(1) cast blank: the cast steel core of recovery is inserted in smelting furnace so that it is temperature reaches more than its fusing point 100 DEG C
Temperature, uses lost-foam casting method cast form, obtains cast steel core blank；
(2) cleaning and finishing: remove the cast gate on cast steel core blank and burr, and its surface is carried out bright and clean place
Reason so that it is surface smoothness rank is higher than the surface smoothness of steel-casting inner chamber 1 grade；
(3) coating coating: the surface-coated silica flour of the prior art steel moulder's paint to cast steel core, thickness of coating layer is
0.5mm, this coating both can play heat-blocking action, can play again the effect of isolated core and steel-casting, prevented the material of core from spreading
Enter in steel-casting.
(4) preheating: the cast steel core being coated with coating is heated to 120 DEG C of insulation 60min, makes in cast steel wicking surface coating
Moisture content and volatile matter volatilization, obtain the cast steel core of the present invention.
The using method of the metal-cored i.e. cast steel core of above-mentioned cast steel meltability, specifically includes following steps:
(1) requiring that casting mold put into by the core of temperature 120-350 DEG C by being preheated to, the core print of cast steel core end is arranged on casting mold
Corresponding core print seat in；
(2) mould assembly cast: being closed by casting mold, liquid cast steel material pours in casting mold, wraps the cast steel core of the present invention,
Under the cooling effect of cast steel core, cast steel material cooled and solidified shapes, and the temperature of cast steel core raises simultaneously, but melting less than cast steel core
Point；Subsequently, along with cooling of steel-casting, cast steel core is also with cooling；
(3) fusible core or depoling: the steel-casting that solidification completes, is wrapped in cast steel core takes out from casting mold, puts into heat treatment
Carrying out 1100 DEG C of insulations in stove, make cast steel core melt and flow out the inner chamber of steel-casting, the steel-casting having taken off core carries out the water of requirement
Tough heat treatment.
(4) reclaim core material: collected by the core material flowed out in steel-casting, be transferred to melt in stove, be heated to 750
DEG C, cast steel core is prepared in cast again.
The most repeatedly, the cast steel core needed for steel-casting can continuously be prepared without increasing core material consumption.
In each embodiment of the present invention, raw materials is material used during this area produces, and all can obtain from market
Arrive, and impact will not be produced for producing result；The instrument and equipment used in each operation, all uses used by current production
Conventional equipment, there is no special feature.
Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention,
Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent.
All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's
Within protection domain.
Claims (1)
1. the using method that a cast steel meltability is metal-cored, it is characterised in that: the metal-cored fusing point of described meltability is
570-660℃；Described meltability is metal-cored is the alusil alloy of 6-8% for siliceous weight fraction；Described meltability is metal-cored
Shape is consistent with steel-casting cavity shape to be shaped, and leaves core print in the end of described core；Described meltability is metal-cored
The ratio of cross-sectional area and the cross-sectional area surrounding the metal-cored steel-casting of this meltability be 0.5-1.5: 1；
Described using method comprises the steps:
(1) requiring the metal-cored casting mold of putting into of the meltability of temperature by being preheated to, the core print of the metal-cored end of meltability is arranged on
In the corresponding core print seat of casting mold；
(2) mould assembly cast: being closed by casting mold, liquid cast steel material pours in casting mold, wraps meltability metal-cored, in meltability
Under metal-cored cooling effect, cast steel material cooled and solidified shapes, and the temperature that meltability is metal-cored simultaneously raises, but less than fusible
The fusing point that property is metal-cored；Subsequently, along with cooling of steel-casting, meltability is metal-cored also with cooling；
(3) fusible core or depoling: solidification is completed, is wrapped in the metal-cored steel-casting of meltability and takes out from casting mold, put into Re Chu
Carry out 800-1100 DEG C of insulation in reason stove, make the metal-cored fusing of meltability and flow out the inner chamber of steel-casting, having taken off meltability metal
The steel-casting of core carries out annealing or normalizing heat treatment again；
(4) reclaim core material: collected by the meltability metal core material flowed out in steel-casting, be transferred to melt in stove, heating
To 700-800 DEG C, cast preparation meltability is metal-cored again.
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| CN106077484A (en) * | 2016-08-16 | 2016-11-09 | 黄小虎 | A kind of multipurpose entirety temperature control panel and preparation method thereof |
| CN108213395A (en) * | 2017-12-26 | 2018-06-29 | 吴立兵 | Demould casting method |
| FR3097791B1 (en) * | 2019-06-28 | 2021-06-18 | Safran Aircraft Engines | HOT CONFORMATION CORE OF A METAL PIECE AND MANUFACTURING, REGENERATION AND CONFORMATION PROCESS |
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| CN1704188A (en) * | 2004-05-28 | 2005-12-07 | 沈阳铸造研究所 | Hot investment precision casting technique for rare earth ceramic cased titanium alloys |
| CN101745602A (en) * | 2009-12-29 | 2010-06-23 | 沈阳铸造研究所 | Production method of low-cost meltable metal mold core for titanium alloy precise-investment casting |
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2013
- 2013-12-24 CN CN201310719277.5A patent/CN103736933B/en not_active Expired - Fee Related
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| GB2193914A (en) * | 1986-08-19 | 1988-02-24 | Metal Castings | Casting using a metal core |
| CN1704188A (en) * | 2004-05-28 | 2005-12-07 | 沈阳铸造研究所 | Hot investment precision casting technique for rare earth ceramic cased titanium alloys |
| CN101745602A (en) * | 2009-12-29 | 2010-06-23 | 沈阳铸造研究所 | Production method of low-cost meltable metal mold core for titanium alloy precise-investment casting |
| CN103240391A (en) * | 2013-04-25 | 2013-08-14 | 西安西工大超晶科技发展有限责任公司 | Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core |
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