CN101823139B - Casting method of low-alloy hydraulic pump stator casting - Google Patents

Casting method of low-alloy hydraulic pump stator casting Download PDF

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Publication number
CN101823139B
CN101823139B CN2009100469460A CN200910046946A CN101823139B CN 101823139 B CN101823139 B CN 101823139B CN 2009100469460 A CN2009100469460 A CN 2009100469460A CN 200910046946 A CN200910046946 A CN 200910046946A CN 101823139 B CN101823139 B CN 101823139B
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casting
melting
hydraulic pump
low
foundry goods
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CN101823139A (en
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徐清
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HUAXIN ALLOY CO Ltd SHANGHAI
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HUAXIN ALLOY CO Ltd SHANGHAI
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Abstract

The invention discloses a casing method of a low-alloy hydraulic pump stator casting, comprising the steps of sand mulling, modeling, charge melting, tapping inoculation treatment, pouring, cooling, unpacking and casting cleanness. In the sand mulling and modeling steps, clay wet sand is produced into a casting model by using a vibratory squeezing slip flask molding machine. The charge melting step comprises charge preparing and melting, wherein the charge comprises the following raw materials in percentage by weight: 15-25 percent of pig iron, 45-55 percent of recirculated iron and 25-35 percent of scrap steel; and the melting is performed by adopting an intermediate-frequency induction electric furnace. The tapping inoculation treatment comprises tapping and inoculation treatment by a silicon-barium inoculant. For the stator casting product produced with the method, the tensile strength is more than 350Mpa and the hardness is 220-280HBS; a graphite form of a gold phase tissue is mainly A type, the graphite length is 4-5 grades, the amount of the pearlite is more than 95 percent and the summation of carbide and phosphorus eutectic is less than 5 percent; and various parts of the casting have no casting defects.

Description

Casting method of low-alloy hydraulic pump stator casting
Technical field
The present invention relates to casting field, particularly a kind of casting method of low-alloy hydraulic pump stator casting.
Background technology
Hydraulic pump is because its operating pressure is high, compact conformation, and volume is little in light weight, and motion steadily and can prevent overload from realizing safeguard protection automatically and is widely used in automobile, shipbuilding, aviation, oil and chemical machinery engineering.Generally adopt vane-type oil pump as booster in the steering of present various automobiles, to alleviate the use muscle power of driver when driving.
Along with the development of Domestic Automotive Industry, driven the development of the vane-type oil pump supporting with it, in recent years especially in Jiangsu and Zhejiang Provinces area rapidly turn up a lot of private vane-type oil pumps specialty enterprises, thereby the demand of the stator cast product supporting with it is increased greatly.
The main performance of stator cast product and technical indicator are: mechanical performance requires usefulness, the tensile strength >=350Mpa of the sample of separately cast test bar cast, and it is 220~280HBS that the hardness of cast form of stator product requires; The foundry goods metallographic structure requires: graphite form is main with the A type, and graphite length is 4~5 grades, and matrix requires pearlite >=95%, carbide+iron phosphide eutectic<5%; Each position of foundry goods does not allow any casting flaw and exists.
Therefore, how to satisfy above-mentioned specification requirement, become the key of casting stator product.
In said stator performance of products and technical indicator, foundry goods metallographic structure index is a core technology of the present invention.The problem that was in the past occurred also be since metallographic structure not up to standard due to.
Summary of the invention
Low-alloy hydraulic pump stator foundry goods of producing such as CC1021S type the purpose of this invention is to provide a kind of casting method of low-alloy hydraulic pump stator casting, so that can satisfy above-mentioned specification requirement.
For achieving the above object, the technical scheme that the present invention adopts is:
Casting method of low-alloy hydraulic pump stator casting, its step comprise mulling, moulding, furnace charge melting, tapping inoculation processing, cast, cooling, unpacking, casting cleaning; Wherein, described mulling operation is in sand preparing system, to mix system clay green-sand, mixes when the molding sand of having made supplies moulding with cart transport to the machine of moulding is other and uses.
Described furnace charge melting step comprises configuration furnace charge and melting, and furnace charge configuration quality percentage is: the pig iron 15~25%, foundry return 45~55%, steel scrap 25~35%; Melting adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1500~1540 ℃;
Described tapping inoculation treatment process comprises taps a blast furnace and two steps of silicon barium inoculated;
In the described cast operation, the pouring temperature of iron liquid is controlled at 1340~1440 ℃.
Further, the chemical composition mass percent of stator foundry goods is: C 3.0~3.3%, Si 1.8~2.2%, Mn 0.6~1.0%, P≤0.15%, S≤0.12%, Cr 0.4~0.8%, Mo 0.6~1.0%, Ni 0.2~0.4%, Fe surplus and inevitable impurity.
The addition of the silicon titanate innoculant that described silicon barium inoculated step is used is 0.50~1.0% of the melting amount of tapping a blast furnace; The chemical composition mass percent of silicon titanate innoculant is: Si 60~70%, Ca0.5~3.0%, Ba 1.0~6.0%, Al 1.0~3.0%, Fe surplus and inevitable impurity.
The granularity of described silicon titanate innoculant is: 3~10mm.
In the described refrigerating work procedure, the foundry goods after requiring to pour into a mould is incubated cool time in sand mold, greater than 2 hours, guarantee that foundry goods eliminates stress in cooling procedure.
In addition, moulding machine adopts microseism compacting removable flask molding machine among the present invention.
The template technology of microseism compacting removable flask moulding is arranged 16 foundry goods with every type, and per 4 foundry goods adopt enlarged running system by a blind riser feeding.
The present invention has adopted 1 times of the modulus of blind riser to the modulus of spray.
Different being of low alloyed element P, Cu, Cr, Mo in the present invention and the chemical composition that external product is adopted adopted Cr, Mo, Ni low alloyed element originally.
Though (C+1/3Si) is very nearly the same for carbon equivalent, what the present invention adopted is that the low silicon of carbon is high, and external employing is the low chemical composition of the high silicon of carbon.This is can the refinement graphite structure because proved through experiment that carbon is low, and graphite length of the present invention reaches 4 grades, and is thin shorter than the graphite length (4~5 grades) of external product.
In addition, in low-alloy cast iron, P is a harmful element, and it had both reduced mechanical property, influenced anti-wear performance again, and in casting and heat treatment process, impel the formation of crackle easily, so the present invention need not high P composition.
Cu and Ni all are the elements that improve quenching degree, but Ni is insoluble to carbide and is dissolved in fully in the matrix, so the effect that Ni improves quenching degree is better than Cu, thereby we do not adopt Cu and adopt the Ni element.
Through the innovation on the above chemical composition, add the cooperation of batching, melting and inoculated technology, the stator product that the present invention produces all is superior to the like product of external import on metallographic structure and mechanical performance, ask for an interview table 1.
Table 1
In the methods of the invention, its template process characteristic is:
(1) per 4 foundry goods carry out feeding with a shared blind riser, be to guarantee the feeding effect of rising head, and the first has adopted 1 times of the modulus of blind riser to the modulus of spray, guarantees that cast product inside does not have shrinkage porosite, shrinkage cavity defect; It two is to have adopted hot riser technology, and promptly all earlier through rising head, it is overheated that rising head is received, thereby guarantee that the foundry goods consecutive solidification makes cast product inside not have shrinkage porosite, shrinkage cavity defect in flow process for all hot iron liquid that get into casting molds.
(2) in order to make running gate system play pushing off the slag effect and the smooth flow effect in die cavity of iron liquid, the present invention has adopted semienclosed running gate system.When iron liquid got into cross gate, cross section strengthened, and flow velocity slows down, and the scum silica frost levitating is also stayed in the cross gate.Clean iron liquid slows down from the bottom of cross gate and flows into blind riser, flows into die cavity after slowing down from rising head more again, so just can avoid producing slag inclusion and sand washing defective.
Described unpacking operation comprises that iron sand separation and foundry goods separate with dead head, and in this operation, the requirement foundry goods of can not thumping splits cast product in case hit.
Beneficial effect of the present invention
The present invention solves the problem up to standard of metallographic structure and mechanical performance from following four aspects:
(1) confirming of product chemical composition: the present invention be not to continue to use the traditional Cu of state's external stator, Cr, Mo low-alloy aspect the chemical composition of product, but autonomous innovation is with Cr, Mo, Ni low alloyed element;
(2) furnace charge configuration aspect: restriction pig iron ratio≤25%, steel scrap ratio>=25%;
(3) iron liquid fusion process adopts iron liquid quiescence in high temperature technology, reaches and reduces graphite nuclei and the pure purpose of iron liquid;
(4) adopt the silicon titanate innoculant heavy dose to breed on the iron liquid inoculated technology, reach the purpose that moment produces the mass crystallization core.
After the metallographic structure index of product solved, its mechanical performance index also just had been readily solved, because the mechanical performance of cast iron materials is by the character decision of the metallographic structure of this material.
Adopt after the casting method of the present invention; The stator foundry goods of producing is with the tensile strength>350Mpa of the sample of separately cast test bar cast, and the hardness of cast form of stator product is 220~280HBS, in the foundry goods metallographic structure; Graphite form is main with the A type; Graphite length is 4~5 grades, the pearlite of matrix>95%, carbide+iron phosphide eutectic<5%; Each position of the body of casting has no casting flaw, satisfies each item specification requirement of stator cast product fully.
Description of drawings
Fig. 1 is embodiment of the invention CC1021S type hydraulic pump stator foundry goods blank figure;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is an embodiment of the invention CC1021S type hydraulic pump stator foundry goods template process schematic representation;
Fig. 4 is the B-B cutaway view of Fig. 3.
The specific embodiment
Embodiment 1
With low-alloy CC1021S type hydraulic pump stator cast casting is example, and its casting method comprises the steps:
(1) mulling moulding
The mulling operation is in sand preparing system, to mix system clay green-sand, and the molding sand that the system of mixing is accomplished uses when supplying moulding with cart transport to moulding machine is other; Be arranged in the type of having made with microseism compacting removable flask molding machine in the pouring area then, wait for iron liquid casting.
Described moulding operation; Low-alloy CC1021S type hydraulic pump stator spray figure of the present invention asks for an interview Fig. 1, Fig. 2, and the stator casting structure is fairly simple, and blank is even; Decision is carried out moulding production with microseism compacting removable flask molding machine; Sand mold is of a size of 390 * 40 * 100/100, and every type is laid 16 foundry goods, and its template artwork is asked for an interview Fig. 3, Fig. 4.
(2) furnace charge melting
Dispose furnace charge earlier, the weight proportion of furnace charge is: the pig iron 20%, foundry return 50%, steel scrap 30%; Drop into medium-frequency induction furnace to the furnace charge that configures then and carry out the melting of iron liquid, when the molten clear and iron liquid temp of furnace charge reaches 1450 ℃, carry out the sample analysis chemical composition, adjust to the chemical composition of iron liquid in the scope of process stipulation then.After this rise to 1520 ℃ to the iron liquid temp, and gentle and quietly put insulation 5~10 minutes, let impurity in the iron liquid is fully floating to come up at this, with gather take off after the slag agent is assembled come out of the stove outside, do not allow these impurity bands in the iron liquid of processing.
(3) tapping inoculation is handled
Comprise and tapping a blast furnace and two steps of silicon barium inoculated; Iron liquid 1520 ℃ leave standstill skim after; Promptly with the 100KG pouring ladle liquid that taps a blast furnace, when tapping a blast furnace liquid, carry out inoculated along with the iron flow adds 0.80% silicon titanate innoculant, stir at last and the bonnet of skimming on coverture go to pour into a mould.Wherein the chemical composition quality percentage of silicon titanate innoculant is: Si 65.4, Ca 1.80, Ba 2.50, Al 2.12 and Fe surplus; The final chemical composition mass percent of product is: C 3.2, Si 2.0, Mn 0.85, P 0.12, S 0.08, Cr 0.65, Mo 0.68, Ni 0.35 and Fe surplus.
(4) cast
Pour into a mould with the 100KG casting ladle in casting-up district to be poured.The pouring temperature of iron liquid is 1380 ℃.
The flow process of iron liquid is asked for an interview Fig. 3, Fig. 4 during cast.
Iron liquid gets into cross gate 2 by cup on the down gate seat 1 and sprue; Float bits levitating because two-way cross gate sectional area and increasing slowed down steadily thereby the iron flow is moved this moment; Follow clean iron liquid and flow into blind riser 4 through 4 wide and flat ingates 3 from the cross gate bottom; Because the cross section of ingate 3 is pre-small post-large, iron liquid slows down once more in ingate and gets into blind riser 4, and iron liquid slows down for the third time from blind riser and flows into foundry goods 5 die cavities.This deceleration flow process of iron liquid has reached the stationarity of its flow process, thereby can avoid the problem of oxidation of the moving process of iron flow, has also reduced the impact of iron liquid to die cavity simultaneously, can avoid foundry goods to produce slag inclusion and sand washing defective thus.
(5) cooling
Casting mold after the cast will run to the cooling zone cooling, and foundry goods is incubated 2 hours in molding sand.
(6) unpack
(7) foundry goods is handled
(8) quality inspection
The product of disqualified upon inspection is eliminated and is cancelled qualified entering foundry goods blank certified products warehouse.
Stator technical target of the product testing result: with the tensile strength>350Mpa of the sample of separately cast test bar cast; The hardness of cast form of product is 220~280HBS; The cast product metallographic structure: graphite form is the A type; Graphite length is 4~5 grades, matrix pearlite>95%, carbide+iron phosphide eutectic<5%; Each position of foundry goods has no casting flaw.Meet each item specification requirement of the stator body of casting.
The main technologic parameters of embodiment 1~5 is asked for an interview table 2.
Table 2
The technical process of embodiment 2,3,4,5 is no longer set forth with embodiment 1.

Claims (6)

1. casting method of low-alloy hydraulic pump stator casting, its step comprise that mulling, moulding, furnace charge melting, tapping inoculation are handled, cast, cooling, unpack, casting cleaning; Wherein, described mulling step of overall modelling is to use the clay green-sand, makes casting mold with moulding machine;
Described furnace charge melting step comprises configuration furnace charge and melting, and quality of furnace charge percentage is: the pig iron 15~25%, foundry return 45~55%, steel scrap 25~35%; Melting adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1500~1540 ℃;
Described tapping inoculation treatment process comprises taps a blast furnace and two steps of silicon barium inoculated; The addition of the silicon titanate innoculant that described silicon barium inoculated step is used is 0.8~1.0% of the melting amount of tapping a blast furnace; The chemical composition mass percent of silicon titanate innoculant is: Si 60~70%, Ca0.5~3.0%, Ba 1.0~6.0%, A11.0~3.0%, Fe surplus and inevitable impurity;
In the described cast operation, the pouring temperature of iron liquid is 1340~1440 ℃;
The chemical composition mass percent of stator foundry goods is: C 3.0~3.3%, Si 1.8~2.2%, Mn 0.6~1.0%, P≤0.15%, S≤0.12%, Cr 0.4~0.8%, Mo 0.6~1.0%, Ni 0.2~0.4%, Fe surplus and inevitable impurity.
2. casting method of low-alloy hydraulic pump stator casting as claimed in claim 1 is characterized in that, the granularity of described silicon titanate innoculant is 3~10mm.
3. casting method of low-alloy hydraulic pump stator casting as claimed in claim 1 is characterized in that, in the described refrigerating work procedure, the foundry goods after the cast is incubated cool time in sand mold, greater than 2 hours, guarantees that foundry goods eliminates stress in cooling procedure.
4. casting method of low-alloy hydraulic pump stator casting as claimed in claim 1 is characterized in that, moulding machine adopts microseism compacting removable flask molding machine.
5. casting method of low-alloy hydraulic pump stator casting as claimed in claim 4 is characterized in that, the template technology of microseism compacting removable flask moulding is arranged 16 foundry goods with every type, and per 4 foundry goods adopt enlarged running system by a blind riser feeding.
6. casting method of low-alloy hydraulic pump stator casting as claimed in claim 5 is characterized in that, the modulus of the blind riser of employing is 2 times of modulus of spray.
CN2009100469460A 2009-03-03 2009-03-03 Casting method of low-alloy hydraulic pump stator casting Active CN101823139B (en)

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Application Number Priority Date Filing Date Title
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CN101823139B true CN101823139B (en) 2012-02-15

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Families Citing this family (7)

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CN102776434A (en) * 2012-07-23 2012-11-14 宁波市鸿博机械制造有限公司 Cast iron alloy for manufacturing stator of automobile steering pump
CN103341594B (en) * 2013-07-03 2016-08-17 河南星鹏铸件有限责任公司 A kind of casting method of brake shell
CN104726759A (en) * 2013-12-24 2015-06-24 武汉重型机床集团有限公司 Production method of as-cast high-strength gray cast iron
CN104630611A (en) * 2015-03-09 2015-05-20 阜新力达钢铁铸造有限公司 Crucible for die-casting machine and casting technology of crucible for die-casting machine
CN110657175B (en) * 2019-09-11 2021-02-02 天宜上佳(天津)新材料有限公司 Composite material brake drum and preparation method thereof
CN112091173A (en) * 2020-07-29 2020-12-18 江阴鑫联金属制品有限公司 Precision investment casting mold and casting method for spiral pump stator
CN113275503B (en) * 2021-04-08 2022-05-31 仙居东方液压机械有限公司 Integral casting process of water-ring vacuum pump

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