CN109014048A - The casting production process and device of boron cast iron cylinder sleeve - Google Patents
The casting production process and device of boron cast iron cylinder sleeve Download PDFInfo
- Publication number
- CN109014048A CN109014048A CN201811223131.0A CN201811223131A CN109014048A CN 109014048 A CN109014048 A CN 109014048A CN 201811223131 A CN201811223131 A CN 201811223131A CN 109014048 A CN109014048 A CN 109014048A
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- cylinder sleeve
- casting
- boron
- cast iron
- iron
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention belongs to diesel engine part processing technique fields, and in particular to a kind of casting production process and device of boron cast iron cylinder sleeve.The pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；Ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets tapping when base iron requires；Inovulant stirring is added, skims, obtains casting liquid；Formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6 to get.The Foundry Production device of boron cast iron cylinder sleeve includes sandbox, sand core, and sprue, ingate and cross gate are arranged in sandbox, venthole is arranged in sand core top sidewall.It is the present invention one case 6, cost-saved, production efficiency is improved, product quality is improved, boron cast iron cylinder sleeve wearability obtained obtains larger raising, and reduces than niobium cylinder sleeve cost.
Description
Technical field
The invention belongs to diesel engine part processing technique fields, and in particular to a kind of casting production process of boron cast iron cylinder sleeve
And device.
Background technique
Existing diesel cylinder sleeve, material is all niobium alloy at present.Niobium alloy has following deficiency at present: 1. market reactions are resistance to
Mill property is poor.2. ontology lower hardness, on-site test average hardness 172.5HBW.Present market boron alloy cylinder sleeve with more, but
Generally centrifugal casting, ontology hardness height can reach 200HBW or more substantially, this body tissue hard phase is in discontinuously netted point
Cloth, hard phase accounts for the 6%-10% of visual field area when dispersed.But centrifuge instrument cost input is big, considers some companies reality
Production batch is less big, in order to save cost, carries out melting using the intermediate frequency furnace apparatus that scene has and resin sand equipment carries out
Molding and core making substantially without cost of investment, but also can reduce Cylinder Sleeve Castings production cost.The smelting technology of cast iron is not added pre-
The problem of electric induction furnace melting of inorganic agent has itself, such as: chilling tendency is big, and degree of graphitization is undesirable, graphite form
Difference, though charge composition is constant, ingredient of original iron melt meets the requirements, bonded hard ferrite magnet under the same conditions, it is also difficult to keep casting
The performance of iron is stablized.Traditional resin sand casting cylinder sleeve generally uses one case two pieces, and production efficiency is low, and place occupies big.
Summary of the invention
It is scientific and reasonable the object of the present invention is to provide a kind of casting production process of boron cast iron cylinder sleeve, it is simple and easy, it is made
Boron cast iron cylinder sleeve wearability obtain larger raising, and reduced than niobium cylinder sleeve cost；Invention also provides boron cast iron cylinders
The Foundry Production device of set, it is cost-saved, production efficiency is improved, product quality is improved.
The casting production process of boron cast iron cylinder sleeve of the present invention, steps are as follows:
(1) pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；
(2) ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets base iron requirement
When tapping；
(3) inovulant stirring is added, skims, obtains casting liquid；
(4) formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6 to get.
By weight percentage,
Furnace charge is clean, dry, must not there is the impurity such as greasy dirt, iron rust.
The additional amount of part steel scrap is the 2/3 of steel scrap gross mass in step (1).
Smelting temperature is 1380-1420 DEG C in step (1).
Step (2) Central Plains hot metal composition is as follows, by weight percentage:
Smelting temperature is 1460-1500 DEG C in step (2).
Before silicon carbide is added in step (2), descum is answered on base iron surface, is rapidly added clean give up after silicon carbide is added
Silicon carbide indentation molten iron is sufficiently stirred in steel, and 1460-1500 DEG C of molten iron coolant-temperature gage, sample examination meet former iron over the course of 15 mins
Tapping when water requires, 1500-1520 DEG C of tapping temperature.
Effect of the silicon carbide as pretreating agent, confrontation electrosmelting of intermediate frequency molten iron nucleation rate is few, and chilling tendency is big, is easy to
The characteristics of generating undercooled graphite.The granularity of silicon carbide is 3-5mm.The 20-40 minutes addition silicon carbide pretreating agents before molten iron discharging,
Molten iron temperature and opportunity obtain external particle at this time for selection, first is that silicon carbide absorptivity is high, second is that external particle is not before crystallization
It easily disappears, is fully utilized during later crystallization, can be improved the nucleation ability of the graphite in molten iron, refinement graphite finally obtains
Obtain high performance casting.
Inovulant in step (3) is the mixture of silicon barium and ferrosilicon, and the quality of silicon barium is the pig iron, ferrochrome, manganese iron, gives up
Steel, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass 0.3-0.5%, the quality of ferrosilicon is the pig iron, ferrochrome, manganese iron, steel scrap, phosphorus
Iron, ferro-boron, copper and silicon carbide gross mass 0.1-0.3%.
Casting liquid in step (3) is that the hot metal composition after breeding is as follows, by weight percentage:
In step (3) inovulant ladle go out to iron water amount 1/3-2/3 when be added, casting before is adequately stirred
It skims.
Cast temperature is 1350-1420 DEG C in step (4).
Formative technology takes horizontal parting in step (4), 90 degree of vertical casting of overturning after moulding, one case 6.
The Foundry Production device of boron cast iron cylinder sleeve of the present invention, including sandbox, sand core, the interior setting sprue of sandbox,
The medium position of sandbox is arranged in ingate and cross gate, sprue, is arranged in parallel with sand core axis, ingate is respectively perpendicular to
The middle part and bottom of sandbox is arranged in sand core axis, and the ingate at middle part serves as ingate using casting connection, and cross gate is used for
Be connected to the ingate of bottom, cross gate and ingate are respectively positioned on sprue two sides, the ingate at cross gate and middle part with directly pour
Road is connected to, and venthole is arranged in sand core top sidewall.
The sand core uses top end opening, the hollow structure of bottom end closure.
The sand core brushes alcohol-base paint, coating layer thickness 0.5mm-0.8mm in all areas that molten iron passes through.
It is set altogether in the sandbox there are six sand core, every three are symmetrically distributed in sprue two sides for one group.
The present invention one case 6, casting system takes bottom filling to add the special running gate system of middle note formula, pours in bottom and centre
Road all uses sheet type, and easy cleaning should not be with meat.Intermediate ingate serves as ingate using casting connection, lowers casting bottom
The hot-spot of sand mold at ingate alleviates casting part shrinkage porosite tendency, reduces rejection rate.Sand core is using open at one end
The closed hollow structure of the other end, had both alleviated sand core weight, and had reduced gas forming amount, reduced cost, and molten iron is prevented to bore
A possibility that core print, this structure greatly improve the exhaust efficiency of sand core, reduce the stomata probability of happening of casting.Venthole
It is arranged at side, cast article, casting station prevents molten iron spilling from hurting pourer in the side of not venthole.
The beneficial effects of the present invention are:
Performance detection of the present invention takes a cylinder sleeve circumference antimere to take 4 test blocks, is processed into the examination of diameter 6mm
Stick obtains liner body intensity in 320MPa or more, hardness 220HBW or more.Metallographic detection, ontology hard phase is in netted or equal
Even dispersed is distributed mesh diameter≤150 μm, and hard phase accounts for the 15% of visual field area.Graphite form is A+B type graphite, graphite grade
Other 1-2 grades.
The present invention one case 6, it is cost-saved, improve production efficiency, improve product quality, intermediate ingate utilize casting
Connection serves as ingate, lowers the hot-spot of the sand mold at the ingate of casting bottom, alleviates casting part shrinkage porosite tendency, subtracts
Low rejection rate.Sand core uses the closed hollow structure of the other end open at one end, had both alleviated sand core weight, and had reduced and get angry
Amount, a possibility that reducing cost, and prevent molten iron drill core head, this structure greatly improves the exhaust efficiency of sand core, drop
The low stomata probability of happening of casting.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the overlooking structure diagram of Fig. 1.
Fig. 3 is the left view structural representation of Fig. 1.
In figure: 1, sand core；2, lightening hole；3, sprue；4, casting；5, venthole；6, ingate；7, cross gate.
Specific embodiment
The present invention is described further with reference to the accompanying drawing:
Embodiment 1
(1) pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；
(2) ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets base iron requirement
When tapping；
(3) silicon barium and ferrosilicon stirring is added, skims, obtains casting liquid；
(4) formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6, i.e.,
?.
By weight percentage,
The additional amount of part steel scrap is the 2/3 of steel scrap gross mass in step (1).
Smelting temperature is 1380 DEG C in step (1).
Step (2) Central Plains hot metal composition is as follows, by weight percentage:
Smelting temperature is 1500 DEG C in step (2).
The quality of silicon barium is the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass in step (3)
0.3%, the quality of ferrosilicon is the 0.3% of the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass.
Cast temperature is 1420 DEG C in step (4).
As shown in Figure 1-Figure 3, the Foundry Production device of boron cast iron cylinder sleeve of the present invention, including sandbox, sand core 1, sand
The medium position of sandbox is arranged in setting sprue 3, ingate 6 and cross gate 7, sprue 3 in case, parallel with 1 axis of sand core
Setting, ingate 6 are respectively perpendicular to the middle part and bottom that sandbox is arranged in 1 axis of sand core, and the ingate 6 at middle part utilizes casting 4
Ingate 6 is served as in connection, and cross gate 7 is used to be connected to the ingate 6 of bottom, and cross gate 7 and ingate 6 are respectively positioned on 3 liang of sprue
The ingate 6 at side, cross gate 7 and middle part is connected to sprue 3, and venthole 5 is arranged in 1 top sidewall of sand core.Sand core 1 uses
Top end opening, the hollow structure of bottom end closure, intermediate cavity are lightening hole 2.Sand core 1 is brushed in all areas that molten iron passes through
Alcohol-base paint, coating layer thickness 0.5mm-0.8mm.It is set altogether in sandbox there are six sand core 1, every three are symmetrically distributed in for one group and directly pour
3 two sides of road.
Formative technology uses the coremaking of furan resin-sand type, horizontal parting, overturns vertical casting for 90 degree after moulding, and one case 6
Part arrangement.Sand mould 1 brushes alcohol-base paint, coating layer thickness 0.5-0.8mm, mould assembling front baking in all areas that molten iron passes through
It is dry.It when mould assembling at 1 core print of sand core and die joint, is sealed with joint sealing cream, prevents ladle core print from choking at fiery integral form face and run away.
Embodiment 2
(1) pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；
(2) ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets base iron requirement
When tapping；
(3) silicon barium and ferrosilicon stirring is added, skims, obtains casting liquid；
(4) formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6, i.e.,
?.
By weight percentage,
The additional amount of part steel scrap is the 2/3 of steel scrap gross mass in step (1).
Smelting temperature is 1420 DEG C in step (1).
Step (2) Central Plains hot metal composition is as follows, by weight percentage:
Smelting temperature is 1460 DEG C in step (2).
The quality of silicon barium is the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass in step (3)
0.4%, the quality of ferrosilicon is the 0.1% of the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass.
Cast temperature is 1350 DEG C in step (4).
Embodiment 3
(1) pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；
(2) ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets base iron requirement
When tapping；
(3) silicon barium and ferrosilicon stirring is added, skims, obtains casting liquid；
(4) formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6, i.e.,
?.
By weight percentage,
The additional amount of part steel scrap is the 2/3 of steel scrap gross mass in step (1).
Smelting temperature is 1390 DEG C in step (1).
Step (2) Central Plains hot metal composition is as follows, by weight percentage:
Smelting temperature is 1480 DEG C in step (2).
The quality of silicon barium is the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass in step (3)
0.5%, the quality of ferrosilicon is the 0.2% of the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass.
Cast temperature is 1400 DEG C in step (4).
Claims (10)
1. a kind of casting production process of boron cast iron cylinder sleeve, it is characterised in that steps are as follows:
(1) pig iron, ferrochrome, manganese iron and part steel scrap are added to electrosmelting of intermediate frequency, skimmed；
(2) ferrophosphorus, ferro-boron, copper, silicon carbide and remaining steel scrap stir-melting are added, sample examination meets when base iron requires
Iron；
(3) inovulant stirring is added, skims, obtains casting liquid；
(4) formative technology use the coremaking of furan resin-sand type, horizontal parting, casting liquid it is vertical casting one case 6 to get.
2. the casting production process of boron cast iron cylinder sleeve according to claim 1, it is characterised in that: by weight percentage,
3. the casting production process of boron cast iron cylinder sleeve according to claim 1, it is characterised in that: part is useless in step (1)
The additional amount of steel is the 2/3 of steel scrap gross mass.
4. the casting production process of boron cast iron cylinder sleeve according to claim 1, it is characterised in that: base iron in step (2)
Ingredient is as follows, by weight percentage:
5. the casting production process of boron cast iron cylinder sleeve according to claim 1, it is characterised in that: breeding in step (3)
Agent is the mixture of silicon barium and ferrosilicon, and the quality of silicon barium is that the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide are total
The 0.3-0.5% of quality, the quality of ferrosilicon are the pig iron, ferrochrome, manganese iron, steel scrap, ferrophosphorus, ferro-boron, copper and silicon carbide gross mass
0.1-0.3%.
6. a kind of Foundry Production device of boron cast iron cylinder sleeve, including sandbox, sand core (1), it is characterised in that: setting is directly poured in sandbox
Road (3), ingate (6) and cross gate (7), the medium position of sandbox is arranged in sprue (3), parallel with sand core (1) axis to set
It sets, ingate (6) is respectively perpendicular to the middle part and bottom that sandbox is arranged in sand core (1) axis, and the ingate (6) at middle part utilizes casting
Part (4) connection is served as ingate (6), and cross gate (7) is used to be connected to the ingate (6) of bottom, cross gate (7) and ingate (6)
It is respectively positioned on sprue (3) two sides, the ingate (6) at cross gate (7) and middle part is connected to sprue (3), sand core (1) top side
Venthole (5) are set on wall.
7. the Foundry Production device of boron cast iron cylinder sleeve according to claim 6, it is characterised in that: sand core (1) uses top
Opening, the hollow structure of bottom end closure.
8. the Foundry Production device of boron cast iron cylinder sleeve according to claim 6, it is characterised in that: sand core (1) is passed through in molten iron
The all areas crossed brush alcohol-base paint, coating layer thickness 0.5mm-0.8mm.
9. the Foundry Production device of boron cast iron cylinder sleeve according to claim 6, it is characterised in that: there are six being set altogether in sandbox
Sand core, every three are symmetrically distributed in sprue (3) two sides for one group.
10. the Foundry Production device of boron cast iron cylinder sleeve according to claim 6, it is characterised in that: poured in bottom and centre
Road (6) all uses sheet type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811223131.0A CN109014048A (en) | 2018-10-19 | 2018-10-19 | The casting production process and device of boron cast iron cylinder sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811223131.0A CN109014048A (en) | 2018-10-19 | 2018-10-19 | The casting production process and device of boron cast iron cylinder sleeve |
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|---|---|
| CN109014048A true CN109014048A (en) | 2018-12-18 |
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ID=64613838
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| CN201811223131.0A Pending CN109014048A (en) | 2018-10-19 | 2018-10-19 | The casting production process and device of boron cast iron cylinder sleeve |
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