CN106799465A - A kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting - Google Patents
A kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting Download PDFInfo
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- CN106799465A CN106799465A CN201611187948.8A CN201611187948A CN106799465A CN 106799465 A CN106799465 A CN 106799465A CN 201611187948 A CN201611187948 A CN 201611187948A CN 106799465 A CN106799465 A CN 106799465A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/068—Semi-permanent moulds
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- 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
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- 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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Abstract
The invention discloses a kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting, the inner chamber of swage is made by cylinder block with type, sand layer thickness is covered for 5mm 20mm, using semiclosed semi open model cast gate；The surrounding core print of upper mold section, upper mold section highest point boss, annex sand core head is respectively equipped with air orifice needle on water jacket face, and cylinder top surface termination is provided with overflow launder；Cylinder top surface sets process gases groove；Heater is provided between upper and lower baffle plate, electrothermal tube is set in apperance；Apperance surrounding is equipped with venting plug；Sand is penetrated after mould and swage temperature reach requirement；Again cored, mould assembling, cast, unpack.With the method for the present invention, yield rate brings up to more than 78%, eliminates stomata, tissue looseness by the 72% of original sand casting, solves the leakage problems of large-scale six cylinders cylinder block, improves overall mechanical properties, reduces sand preparing machine, place and sand using amount；Improve the adverse circumstances of casting.Technological process is simple, is easily controlled, and production cost is lower than sand casting by 25~40%.
Description
Technical field
The invention belongs to engine cylinder block casting field, particularly a kind of large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting
Production method.
Background technology
Sand-Faced Metal Mould Casting is to be covered with a thin layer of molding sand (also known as overlay film around metal mold (also known as swage) inner chamber
Sand) a kind of casting technique.It is two methods of permanent mold casting and the combination of shell moulded casting.The casting of acquisition has chi
The advantages of very little high precision, good mechanical property, material structure densification, artificial saving, material and facility, low production cost.
At home, the application study of Sand-Faced Metal Mould Casting technique is used in the production of bent axle or spheroidal graphite cast-iron.In recent years
Come, in the whole nation, existing nearly various schools of thinkers enterprise also applies Sand-Faced Metal Mould Casting technique, the part of production in addition to spherulitic iron crankshaft, also vapour
The casting such as the cam balance shaft of car, pressure-resistant valve body, cylinder sleeve, automobile chassis important spare part, the following cylinder block of four cylinders, and use and be somebody's turn to do
The cylinder block that Sand-Faced Metal Mould Casting technology next life steams more than the cylinder of car engine six is to be covered in four cylinder cylinder block swages at present
Expand research, the current still blank of the technology on the basis of sand Technology application.
Large-scale six cylinders above engine production producer is produced in China, is all using resin sand casting or Pressure casting side
Method is produced, although comparatively also more stable in quality, but belongs to sand casting, and sand using amount is very big, and production environment is also
Improved completely, the internal quality of casting some problems are still improved and solved, such as organized shrinkage porosite, stomata；Sand
The equipment such as equipment set, material storehouse, molding sand conveying, the dedustings such as the treatment Ministry of worker, working environment is poor, is unfavorable for casting life
Environmental protection is produced, equipment investment is big, and high cost, area occupied is also big.Product is poured into a mould and after thermally treated annealing in gray cast iron, and body resists
Tensile strength is extremely difficult to the required trade mark, and such as my company's self-hardening resin sand casts the T9000 cylinder block HT250 trades mark, body in the past
Tensile strength is mostly 235Mpa, and hardness is between 177-189, and graphite is long at 3-4 grades.Nowadays in automobile industry keen competition
Under, the cylinder block requirement more and more higher of each manufacturer production casts cost more and more higher, various performance indications requirements reach or
More than national standard, such as require to solve the problems, such as three leakages phenomenon and Cost Problems.And the sand casting process of routine cannot be basic
Solve the problems, such as the cast iron Cost Problems for organizing shrinkage porosite and seepage and casting process in itself.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting,
Solve that gray iron or the common tissue looseness of the large-scale six cylinders above cylinder block of compacted iron, gas (contracting) hole, surface quality be poor, entirety mechanicalness
The problem and the problem of casting high cost that can be cannot be guaranteed.
The present invention solves large-scale six cylinders above cylinder block technical problem with following technical scheme：
A kind of production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting, processing step is as follows：
(1) moulding
Outer sandbox uses swage, and precoated sand is regenerating resin sand, and swage is cast into 1/type, and cylinder block is pressed in the inner chamber of swage
Shape made with type, cover sand layer thickness for 5mm-20mm with type；Running gate system has sprue cup, down gate, runner gate and filter screen,
Using semiclosed semi open model cast gate；
The surrounding core print of upper mold section is equipped with air orifice needle and passes case face；Upper mold section highest point boss has air orifice needle and does not pass
Case face；Annex sand core head is provided with air orifice needle and passes case face on water jacket face；Cylinder bottom face near cast gate does not set exhaust needle；Cylinder top
Face termination is respectively equipped with overflow launder and exhaust needle；Heater is provided with the middle of the baffle plate up and down of external mold, electricity is additionally provided with apperance
Heat pipe；Apperance surrounding in template is provided with venting plug；
6 ingate sectional areas 1/3-1/4 bigger than resin sand sectional area of female die；Bolster is provided with swage highly
The same guide finger；Upper/lower die is equipped with 4 closing pins with swage；
Carry out penetrating sand after the temperature of mould and swage reaches requirement；
(2) core
Using cylinder block it is special from hard cold core sand, the assembly of sand core of six cylinder cylinder block be in special loose tool over-assemble, it is whole
Body lifting immersion is coated and is filtered dry, baking condition is consistent with existing phenolic sand molding technique, and sand core drying temperature control is
200-220 DEG C, intensification 6h insulations 2h；Baked main body sand core, the core print of annex core get out steam vent；Six main body sand
In-core is respectively embedded with and empties body；
(3) cored
Finishing core, Xiu scrapes core and coats accumulation, blows off loose sand；Die cavity loose sand is blown off, plunger tip bar is manually sequentially loaded into
Core, fixes rear artificial suspension bracket cored or fills main body sand core with fixed station clamp, then fill sand core of water jacket successively；In water jacket
1mm thickness asbestos ring, all around core print is sealed before core is loaded using sealing strip on the core print pad of core；
(4) mould assembling
Push down main body sand core surrounding core print, core print venthole, core sprue before mould assembling respectively using sealing strip；In main body
The running gate system filter screen seat of sand core head loads onto special straight hole foam ceramic filter；Pad is placed respectively on the side of lower half casting mold four；Blow
At loose sand in net upper half model air orifice needle, finishing down gate and placement sprue cup face, and coat alcohol radical graphite paint；Plug guiding
Mould assembling after pin；Buckle box fastener；Sprue cup uses special six cylinders machine straight-flushing funnel sprue cup, and sealing strip is used when being installed to swage；
(5) pour into a mould
It is HT250 molten iron castings to use the trade mark, and molten iron composition quality ratio is：
C：3.2%~3.3% Si：1.7%~1.8% Mn：0.6%~0.8% Cu：0.5%~0.6%
Cr≤0.15% P≤0.06% S≤0.08%；
Pouring temperature is controlled in 1430-1450 DEG C, current-following inoculation；Casting process at surrounding core print to carrying out bleed；1/
The duration of pouring of the cylinder cylinder block of type six is 35-45s；Sprue cup is interrupted when sprue cup molten iron is into pasty state；
(6) unpack
Cast is unpacked and is detained for 60 minutes after terminating；More than the 70 minutes casting solidification time case that falls, is then freely cooled to room temperature.
The molten iron flow channel of the running gate system is to down gate to runner gate, then by runner gate by after filter screen by sprue cup
Six points of down gates are assigned in equilibrium, then are respectively divided into 12 of upper six points of runner gatees of row's main core by six points of down gates and are poured
6 ingates of mouth and bottom runner gate arrive casting again；Running gate system uses semiclosed semi open model cast gate；Running gate system is respectively poured
The ratio between mouthful total cross section is：The horizontal Jiao Kou ︰ ∑s ingate=1 ︰ (0.70- of the horizontal Jiao Kou ︰ ∑s of ∑ Zhi Jiao Kou ︰ ∑s point Zhi Jiao Kou ︰ ∑s point
0.75) ︰ (1.40-1.46) ︰ (1.38-1.42) ︰ (1.80-1.90)；Filter screen is using the special straight-bore ceramic filter screen of six cylinder bodies.
The surrounding core print of upper mold section is respectively arranged with 4-5 root external diameter Φ 20mm air orifice needles and all passes case face per side；Upper mold section is leaned on
The highest point boss of nearly cylinder top surface is evenly equipped with the air orifice needle of 20-25 root external diameter Φ 15mm and does not pass case face；It is attached on water jacket face
Part sand core head is provided with 7 air orifice needles of external diameter Φ 15mm and all passes case face；
The thick process gases grooves of 2mm are provided between cylinder summit portion boss；Heating dress in the middle of the baffle plate up and down of external mold
6 electrothermal tubes of 1.8m are set to, the electrothermal tube in apperance is 2 1.2m and 8 electrothermal tubes of 0.5m, and core print has loose piece；Template
On the uniform venting plug of apperance surrounding have 32, external diameter is Φ 20mm.
The swage inner chamber covers layer of sand, and surrounding core print covers layer of sand thickness for 5mm, is locally provided with solid sand launder；Connect with casting
The layer of sand thickness of covering of contact portion point is 8-10mm, and local covers layer of sand thickness for 15-20mm, and surrounding increases solid sand launder；Penetrate sand air pressure
It is 0.35-0.40Mpa, hardening time is 80-90S, that penetrates after sand covers layer of sand color for sepia.
The mold temperature control is at 180-200 DEG C；Swage temperature control is at 200-240 DEG C.
The sand air pressure of penetrating for penetrating sand is 0.35-0.40Mpa, and hardening time is 50-60S.
The core has 6 main body sand cores, and the horizontal ingate sectional area in each main body sand core inside is bigger by 1/ than resin sand core
4-1/5, body is emptied for pre-buried homogeneous in each main body sand core.
Had on the side of lower half casting mold four during the mould assembling and be placed with pad at 10 respectively, the pad often located is two-layer, every layer
Pad thickness 0.3-0.4mm.The box fastener buckled during the mould assembling is the special box fastener of six cylinders, and the power control of button case is in 80-85N.M.
Remarkable advantage of the invention is：
Using the production method of the cylinder cylinder block of Sand-Faced Metal Mould Casting of the invention six, yield rate is by original sand casting process
72% bring up to more than the 78% of swage casting, cover sand molding material and suitable because swage is done using moisture free resin sand
When exhaust air technique, so as to eliminate the common stomata of six cylinder cylinder block or subcutaneous blowhole defect；Because being obtained during molten steel solidification
To quick cooling, tissue shrinkage porosite, the defect in loose, gas (contracting) hole that six cylinder cylinder block often have are essentially eliminated, solved large-scale
Leakage problems of the six cylinder cylinder block under pressure operating environments, improve the overall mechanical properties of casting, meet or more than current
The property indices of large-scale six cylinders cylinder block production requirement；Reduce the huge equipment of sand preparing system, place input and make
Type sand using amount；Casting adverse circumstances for a long time are improved, the feature of environmental protection is good.Whole technological process is simple, easily takes measures
And control, the production cost of product produces low by 25~40% than sand casting process, and suitable for large-scale six cylinder of all kinds
The production of the important complex partses such as above engine cylinder block, cylinder head and it is various require high-quality other big-and-middle findings,
Application prospect is extensive.
Specific embodiment
Specific embodiment of the invention described in detail below, but the limit to the claims in the present invention protection domain is not constituted
System.
Sand-Faced Metal Mould Casting technique is to increase cooling velocity of the molten iron in casting process using swage, and thinning microstructure is carried
Cylinder block high ensures body thicker or thicker boss, the dense structure's property of tower in the case of wall unevenness.Equal
Under the composition of melt iron, tension higher can be obtained than sand casting process using Sand-Faced Metal Mould Casting technique productions body
Intensity, hardness and more preferable graphite form and graphite size rank, stabilizing pearlite is more than 95%.Above all set in the past
The problems such as three leakages (oil leak, leak, gas leakage) that six cylinder cylinder block sand casting of fat sand production occur, is effectively solved completely.
The Sand-Faced Metal Mould Casting art shapes of the cylinder cylinder bodies of large-scale T9000 six of the present embodiment are large-scale special using making by oneself
ZXTF-Z-2000*1200 moulding main frame is produced.According to swage specification requirement, large-scale six cylinders cylinder block can only be designed as 1/type,
Divide upper and lower mould.Upper drag box is metal mold, and inner chamber is the shape according to six cylinder cylinder block, leaves and covers sand layer thickness and with type system
Go out, in the middle of baffle plate, heater is all respectively equipped with the middle of apperance, the general thermostatic control of mold temperature is at 180-200 DEG C；Swage
Temperature is typically controlled at 200-240 DEG C.Moulding uses precoated sand, after mould and swage temperature reach the temperature of setting, by master
Machine is covered with a thin layer of molding sand around swage inner chamber.Body is emptied using pre-buried in manufacture main body sand core, a large amount of sand are reduced
Core.Therefore, a large amount of sand using amounts are reduced on using Sand-Faced Metal Mould Casting technique, so as to reduce casting cost.
By the precoated sand that Iron Mould Coated Sand technique is used is to flow dry type, no moisture, after penetrating sand Surface hardened layer,
Its surface smoothness very well, is locally coated.And resin sand casting technique is category wet type (tidal stencils) casting, its surface needs two
Secondary coating just can guarantee that surface quality of continuous castings.Therefore Sand-Faced Metal Mould Casting technique can a large amount of saving color cost.
As a example by producing the large-scale six cylinders cylinder block of Yuchai T9000, with Iron Mould Coated Sand technique productions cylinder body (1/type) than with
During preceding use resin sand casting production process, foundry sand amount 592 yuan/platform of cost savings, cost of alloy saves 181.55 yuan/platform
More than, casting and molding separate unit makes sand using amount only need 88kg or so；If by 2000 calculating are produced per year, light chisel sand using amount can be saved
More than 154.6 ten thousand yuan.Sand-Faced Metal Mould Casting production line reduces 27,000,000 yuan of investment than domestic static pressure production line, than import static pressure
Production line reduces more than 47,000,000 yuan of investment, and still more designed, designed is large-scale with making covers sand molding main frame, and investing is less.
Sand-Faced Metal Mould Casting technique with product yield it is high, dense structure is non-leakage, combination property is high, sand using amount
Less, equipment investment is few, with short production cycle, instant effect, few hold facility area, low cost of manufacture, the good feature of environmental protection the advantages of it is same
When, its weak point is that various swage sandboxes do not have versatility, influenceed single day yield relatively low by equipment.
The inventive method produces T9000 Yuchais large-scale six cylinders cylinder block peculiar to vessel as a trial, comprises the following steps that：
1. moulding
Outer sandbox uses swage, and precoated sand is regenerating resin sand, and swage casting technique is designed according to 1/type, swage
Inner chamber made with type by the shape of cylinder block, cover sand layer thickness for 5mm-20mm with type, the larger position of casting thermal center is 40mm；
The molten iron flow channel of running gate system is, to down gate to runner gate, then to assign to six by filter screen post-equalization by runner gate by sprue cup
Divide down gate, then poured by 12 ingates and bottom transverse that six points of down gates are respectively divided into upper six points of runner gatees of row's main core
6 ingates of mouth arrive casting again.Different from four cylinder cylinder block, running gate system uses semiclosed semi open model cast gate；Cast system
The ratio between each cast gate total cross section of uniting is：Horizontal Jiao Kou ︰ ∑s ingate=1 ︰ of the horizontal Jiao Kou ︰ ∑s of ∑ Zhi Jiao Kou ︰ ∑s point Zhi Jiao Kou ︰ ∑s point
(0.70-0.75) ︰ (1.40-1.46) ︰ (1.38-1.42) ︰ (1.80-1.90)；Filter screen is using the special straight hole pottery of six cylinder bodies
Porcelain filter screen.
Mould：The surrounding core print position of upper mold section is respectively arranged with the air orifice needle of 4-5 root external diameter Φ 20mm per side, and passes case
Face；Upper mold section is evenly distributed with 20-25 root external diameter Φ 15mm's near the highest point boss (being communicated with casting) of cylinder summit portion
Air orifice needle, and all enter not passing case face；Annex sand core head is provided with 7 air orifice needles of external diameter Φ 15mm and all passes on water jacket face
Case face；Cylinder bottom surface portions near cast gate do not set exhaust needle；Cylinder top surface termination is respectively equipped with overflow launder and exhaust needle；Cylinder top surface office
Increase the thick process gases grooves of 2mm between portion's boss；6 electrothermal tubes of 1.8m are respectively equipped with the middle of the baffle plate up and down of external mold,
2 1.2m and 8 electrothermal tubes of 0.5m are additionally provided with apperance, core print is made loose piece and is conveniently replaceable electrothermal tube；Apperance in template
Surrounding is respectively mounted 32 external diameter Φ 20mm venting plugs, is easy to penetrate sand final vacuum；Mold temperature is controlled at 180-200 DEG C；
Sand-Faced Metal Mould Casting process modification：6 ingate sectional areas 1/3-1/ bigger than resin sand sectional area of female die
4；Bolster makes the guide finger as swage height；Upper/lower die is equipped with 4 short closing pins with swage；Swage inner chamber
Layer of sand is covered in design, and the layer of sand that covers of surrounding core print is 5mm, locally makes solid sand launder；The layer of sand that covers with casting contact portion is 8-
10mm, few local layer of sand that covers is 15-20mm, and surrounding increases solid sand launder；Swage temperature control works as mould at 200-240 DEG C
Carry out penetrating sand after reaching requirement with swage temperature；Sand air pressure is penetrated for 0.35-0.40Mpa, hardening time is 80-90S, after penetrating sand
Layer of sand color is covered for sepia.When production is started, the general heated stove of swage is heated, it is desirable to which swage ambient temperature is entered
Row cooling, makes swage internal and external temperature carry out penetrating sand after reaching temperature control；Swage after continuous production cast must be to swage middle part
It is water cooled to be just circulated use when but reaching temperature requirements afterwards (thermometric is carried out using infrared ray).
2. core
The large-scale cylinder block cores of T9000 are using Yuchai Foundry Works production cylinder block from hard cold core sand.Six cylinder cylinders
The assembly of sand core of body is that in special loose tool over-assemble, integral hoisting immersion is coated and is filtered dry, baking condition and existing resin sand
Formative technology is consistent, and sand core drying temperature general control is 200-220 DEG C, intensification 6h insulations 2h；Baked main body sand core
Core print with annex core gets out steam vent；It is with resin sand core difference：Large-scale six cylinders cylinder block swage technique makes
Big 1/4-1/5 of the horizontal ingate sectional area in main body sand core inside than resin sand core.To reduce sand using amount cost declining, six masters
Empty body in pre-buried 1 of the body core inside of each.
3. cored
It is well placed lower half casting mold, checks whether institute's sand loading core quality meets the requirements, repair core, repaiies and scrape core and coat heap
Product, blows off loose sand, then checks outer mold quality up and down, blows off die cavity loose sand, is manually sequentially loaded into plunger tip bar core, fixes
Afterwards artificial suspension bracket cored or with fixed station clamp fill main body sand core, check four sides alignment target；Fill sand core of water jacket successively again；
1mm thickness asbestos ring, all around core print is sealed before core is loaded using sealing strip in the core print position pad of sand core of water jacket.
4. mould assembling
Close pre and push down main body sand core surrounding core print, core print venthole, core sprue using sealing strip, check pendulum
Whether suitable put position, otherwise need to be adjusted；Special straight hole pottery is loaded onto in the running gate system filter screen seat of main body sand core core print
Porcelain screen pack；Two-layer 0.3-0.4mm pads are placed with respectively on the side of lower half casting mold four, at totally 10；Upper half model quality is checked, is blown off
At loose sand in upper half model air orifice needle, finishing down gate and placement sprue cup face, and coat alcohol radical graphite paint；Plug guide finger
Alignment pin holes mould assembling afterwards；The special box fastener of six cylinders (buckleing generally 4 in side) is buckled, is diagonally tightened, button case power general control is in 80-
85N.M；Sprue cup uses special six cylinders machine straight-flushing funnel sprue cup, and sealing strip is used when being installed to swage；
5. pour into a mould
The use of the molten iron trade mark is HT250, its chemical composition mass ratio is：
C：3.2%~3.3% Si：1.7%~1.8% Mn：0.6%~0.8% Cu：0.5%~0.6%
Cr≤0.15% P≤0.06% S≤0.08%
Pouring temperature is controlled in 1430-1450 DEG C, current-following inoculation；Casting process carries out bleed to surrounding core print；1/type
The duration of pouring of the cylinder cylinder block of T9000 six is 35-45s；Sprue cup is interrupted when sprue cup molten iron is into pasty state；
6. unpack
Cast terminates the rear button that can unpack for 60 minutes；Until the casting solidification time needs the case that can just fall for more than 70 minutes, fall
Casting after case is furvous, is then freely cooled to room temperature.
7. assay
Large-scale six cylinders cylinder block casting through carried out after the case that falling it is thick clear after, remove internal stress by Low Temperature Heat Treatment, then
Impeller blasting is carried out, it is as follows through dissecting casting body testing result：
1) each position metallographic structure of T9000 cylinder block and hardness situation are as follows：
| Inspection position | Casing wall top | Bearing wall | Casing wall bottom |
| Hardness HB | 213 | 193 | 200 |
| Stone-type | A | A | A |
| Graphite is (level) long | 4 | 4 | 4 |
| Pearlite (%) | 95 | 95 | 95 |
2) mechanical performance
Tension coupon does not have position sample because of body, therefore point down gate in taking casting moulding system carries out tensile inspection,
Its result tensile strength is 265Mpa；Hardness is HB195；Stone-type is A type graphite；A length of 4 grades of graphite；Pearlite 95%；Phosphorus is total to
It is brilliant 1 grade.
Using the large-scale six cylinders cylinder block of Iron Mould Coated Sand cast of the invention, can be with conditions of performance requirement is met
Without adding or reducing precious alloy, such as molybdenum-iron and copper alloy；Cu alloys can be reduced to 0.5 by original 0.7~0.8%~
0.6%；Manganese alloy is reduced to 0.6~0.8% by original 0.8~0.9%；Met the requirements in guarantee cylinder block body hardness
Under, ferrochrome etc. can be not added with completely.
Practice explanation：With the present invention large-scale six cylinders above cylinder block of production, bulk mechanical performance is than sand casting body
It is required that the trade mark will be higher by more than a trade mark, so as to ensure that meeting growing engine manufacturing competition requires.
With the method for the present invention, large-scale six cylinders vermicular cast iron or spheroidal graphite cast-iron cylinder block, cylinder cap etc. can be not only produced
High-quality automobile important spare part, can be also used for the machine-building of all trades and professions, such as aviation, rail vehicles, agricultural
Machinery, building machinery and military project etc. are subjected to the large-scale class part production of high intensity, high tenacity, high compactness, high abrasion.
Claims (9)
1. the production method of the large-scale six cylinders cylinder block of a kind of Sand-Faced Metal Mould Casting, it is characterized in that, processing step is as follows：
(1) moulding
Outer sandbox uses swage, and precoated sand is regenerating resin sand, and swage is cast into 1/type, and the shape of cylinder block is pressed in the inner chamber of swage
Shape is made with type, and sand layer thickness is covered for 5mm-20mm with type；Running gate system has sprue cup, down gate, runner gate and filter screen, uses
Semiclosed semi open model cast gate；
The surrounding core print of upper mold section is equipped with air orifice needle and passes case face；Upper mold section highest point boss has air orifice needle and does not pass case
Face；Annex sand core head is provided with air orifice needle and passes case face on water jacket face；Cylinder bottom face near cast gate does not set exhaust needle；Cylinder top surface
Termination is respectively equipped with overflow launder and exhaust needle；Heater is provided with the middle of the baffle plate up and down of external mold, electric heating is additionally provided with apperance
Pipe；Apperance surrounding in template is provided with venting plug；
6 ingate sectional areas 1/3-1/4 bigger than resin sand sectional area of female die；Bolster is provided with as swage height
Guide finger；Upper/lower die is equipped with 4 closing pins with swage；
Carry out penetrating sand after the temperature of mould and swage reaches requirement；
(2) core
Using cylinder block it is special from hard cold core sand, the assembly of sand core of six cylinder cylinder block is, in special loose tool over-assemble, integrally to hang
Dress immersion is coated and is filtered dry, baking condition is consistent with existing phenolic sand molding technique, and sand core drying temperature control is 200-220
DEG C, intensification 6h insulations 2h；Baked main body sand core, the core print of annex core get out steam vent；In six main body sand cores
It is embedded with respectively and empties body；
(3) cored
Finishing core, Xiu scrapes core and coats accumulation, blows off loose sand；Die cavity loose sand is blown off, plunger tip bar core is manually sequentially loaded into,
Fix rear artificial suspension bracket cored or fill main body sand core with fixed station clamp, then fill sand core of water jacket successively；In sand core of water jacket
Core print pad on 1mm thickness asbestos ring, all around seal core print using sealing strip before core is loaded；
(4) mould assembling
Push down main body sand core surrounding core print, core print venthole, core sprue before mould assembling respectively using sealing strip；In main body sand core
The running gate system filter screen seat of core print loads onto special straight hole foam ceramic filter；Pad is placed respectively on the side of lower half casting mold four；Blow off
At loose sand in half model air orifice needle, finishing down gate and placement sprue cup face, and coat alcohol radical graphite paint；After plugging guide finger
Mould assembling；Buckle box fastener；Sprue cup uses special six cylinders machine straight-flushing funnel sprue cup, and sealing strip is used when being installed to swage；
(5) pour into a mould
It is HT250 molten iron castings to use the trade mark, and molten iron composition quality ratio is：
C：3.2%~3.3%Si：1.7%~1.8%Mn：0.6%~0.8%Cu：0.5%~0.6%Cr≤0.15%P≤
0.06%S≤0.08%；
Pouring temperature is controlled in 1430-1450 DEG C, current-following inoculation；Casting process at surrounding core print to carrying out bleed；1/type six
The duration of pouring of cylinder cylinder block is 35-45s；Sprue cup is interrupted when sprue cup molten iron is into pasty state；
(6) unpack
Cast is unpacked and is detained for 60 minutes after terminating；More than the 70 minutes casting solidification time case that falls, is then freely cooled to room temperature.
2. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the cast
The molten iron flow channel of system be by sprue cup to down gate to runner gate, then by runner gate by filter screen post-equalization assign to six points it is straight
Cast gate, then 12 ingates and bottom runner gate of upper six points of runner gatees of row's main core are respectively divided into by six points of down gates
6 ingates arrive casting again；Running gate system uses semiclosed semi open model cast gate；The ratio between each cast gate total cross section of running gate system is：
Horizontal Jiao Kou ︰ ∑s ingate=1 ︰ (0.70-0.75) ︰ (the 1.40-1.46) ︰ of the horizontal Jiao Kou ︰ ∑s of ∑ Zhi Jiao Kou ︰ ∑s point Zhi Jiao Kou ︰ ∑s point
(1.38-1.42) ︰ (1.80-1.90)；Filter screen is using the special straight-bore ceramic filter screen of six cylinder bodies.
3. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, upper mold section
Surrounding core print is respectively arranged with 4-5 root external diameter Φ 20mm air orifice needles and all passes case face per side；Highest point of the upper mold section near cylinder top surface
Boss is evenly equipped with the air orifice needle of 20-25 root external diameter Φ 15mm and does not pass case face；Annex sand core head is provided with 7 on water jacket face
The air orifice needle of external diameter Φ 15mm and all pass case face；
The thick process gases grooves of 2mm are provided between cylinder summit portion boss；Heater in the middle of the baffle plate up and down of external mold is 6
The electrothermal tube of root 1.8m, the electrothermal tube in apperance is 2 1.2m and 8 electrothermal tubes of 0.5m, and core print has loose piece；Mould in template
The uniform venting plug of sample surrounding has 32, and external diameter is Φ 20mm.
4. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the swage
Inner chamber covers layer of sand, and surrounding core print covers layer of sand thickness for 5mm, is locally provided with solid sand launder；Layer of sand is covered with casting contact portion
Thickness is 8-10mm, and local covers layer of sand thickness for 15-20mm, and surrounding increases solid sand launder；Sand air pressure is penetrated for 0.35-0.40Mpa, Gu
The change time is 80-90S, and that penetrates after sand covers layer of sand color for sepia.
5. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the mould
Temperature control is at 180-200 DEG C；Swage temperature control is at 200-240 DEG C.
6. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, it is described to penetrate sand
Penetrate sand air pressure for 0.35-0.40Mpa, hardening time is 50-60S.
7. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the core
Have 6 main body sand cores, the horizontal ingate sectional area in each main body sand core inside than resin sand core big 1/4-1/5, each main body sand
Pre-buried homogeneous of in-core empties body.
8. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the mould assembling
When had on the side of lower half casting mold four and be placed with pad at 10 respectively, the pad often located is two-layer, every layer of pad thickness 0.3-0.4mm.
9. the production method of the large-scale six cylinders cylinder block of Sand-Faced Metal Mould Casting as claimed in claim 1, it is characterized in that, the mould assembling
When the box fastener buckled be the special box fastener of six cylinders, the power control of button case is in 80-85N.M.
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| CN109773138A (en) * | 2019-03-29 | 2019-05-21 | 山东潍坊拖拉机厂集团有限公司 | Utilize the method for four cylinder integrated cylinder cover die castings, six cylinder integrated cylinder cover |
| CN115491579A (en) * | 2022-09-28 | 2022-12-20 | 江苏力源金河铸造有限公司 | High-precision hydraulic electromagnetic valve casting and casting process design thereof |
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