CN106077470A - Compacted ferrum engine cylinder cover pouring technology - Google Patents

Compacted ferrum engine cylinder cover pouring technology Download PDF

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Publication number
CN106077470A
CN106077470A CN201610732037.2A CN201610732037A CN106077470A CN 106077470 A CN106077470 A CN 106077470A CN 201610732037 A CN201610732037 A CN 201610732037A CN 106077470 A CN106077470 A CN 106077470A
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CN
China
Prior art keywords
sand
ferrum
mould
compacted
engine cylinder
Prior art date
Application number
CN201610732037.2A
Other languages
Chinese (zh)
Inventor
黄党怀
Original Assignee
重庆新红旗缸盖制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 重庆新红旗缸盖制造有限公司 filed Critical 重庆新红旗缸盖制造有限公司
Priority to CN201610732037.2A priority Critical patent/CN106077470A/en
Publication of CN106077470A publication Critical patent/CN106077470A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/02Sand moulds or like moulds for shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/22Moulds for peculiarly-shaped castings

Abstract

The present invention relates to metal casting technique field, it is specifically related to a kind of compacted ferrum engine cylinder cover pouring technology, including following operation, matched moulds preheats, adds sand hardening, coating, group case, standby potting syrup, cast, pickup, the program is compared to the prior art, iron flask sand-covering technique is applied in the casting of vermicular cast iron engine cylinder cover, it is cast with the sand mold shell of rigidity owing to iron flask covers sand, make sand mold bulk strength high, indeformable, decrease the deformation during casting pouring, and positioning reliable, precision height, foundry goods is also more prone to the demoulding simultaneously.

Description

Compacted ferrum engine cylinder cover pouring technology
Technical field
The present invention relates to metal casting technique field, be specifically related to a kind of compacted ferrum engine cylinder cover pouring technology.
Background technology
Vermicular cast iron, is called for short compacted ferrum, refers to that liquid cast-iron is through creepage rate so that it is in graphite be vermiform and a small amount of pelletizing Shape.If creepage rate is excessive, vermicular cast iron reforms into spheroidal graphite cast-iron, and compactedization deficiency reforms into casting pig.Due to vermiform The form of graphite between lamellar and spherical between, so the mechanical property of vermicular cast iron is between casting pig and spheroidal graphite cast-iron, Its casting character, damping and heat conductivity are better than spheroidal graphite cast-iron, close with casting pig.Owing to vermicular cast iron has spheroidal graphite cast-iron concurrently With the performance of casting pig, therefore, it has the purposes of uniqueness, at ingot mould, automobile engine, exhaustor, glass mold, diesel oil The application of the aspects such as machine cylinder cap, braking component is respectively provided with good effect.
Cylinder cap is arranged on above cylinder body, from cylinder body top seal cylinder and constitute combustor.Owing to cylinder cap is frequent and high temperature High-pressure gas contacts, and the most often bears the biggest thermic load and mechanical load, so the intensity of foundry goods, compactness and size Precision is the important technology index of measured engine cylinder cap.Conventional compacted ferrum engine cylinder cover is that casting forms, technological process master Including prepare casting mold, preparation core mold, mould preheating, lower core, prepare molten metal bath, molding cast, cool down open Mould, cut rising head, surface process, heat treatment, quality inspection warehouse-in.Owing to existing mould mostly is sand mold mould, rigidity is more weak, in cast Time foundry goods be susceptible to deformation, the blank dimensional accuracy causing cylinder cap is low, and compactness is inadequate, and then affects the intensity of cylinder cap.
Summary of the invention
The invention is intended to provide a kind of compacted ferrum engine cylinder cover pouring technology, to improve dimensional accuracy and the intensity of cylinder cap.
Compacted ferrum engine cylinder cover pouring technology in this programme, including following operation:
S1, matched moulds preheat: assemble iron flask and mould and leave gap in centre and formed and cover sand cavity;
S2, add sand hardening: to described in step S1 cover sand cavity in inject precoated sand, heating, drying makes precoated sand harden Film, is formed and covers layer of sand;
S3, coating: the separately mould after precoated sand hardening and iron flask, by described iron flask and die flip to covering layer of sand court On, coat water-based graphite coating on described layer of sand surface of covering, and heat iron flask and mould carries out preheating and makes water-based graphite be coated with The moisture evaporation of material;
S4, group case: the iron flask after coating in step S3 and mould being re-assemblied, middle part forms the die cavity for cast;
S5, standby potting syrup: in high-temperature smelting pot, prepare former ferrum fused solution, and carry out creepage rate;
S6, cast: pour into a mould in the former ferrum fused solution after creepage rate in step S5 is joined the die cavity described in step S4, Natural cooling after casting complete;
S7, pickup: open iron flask and mould, take out foundry goods, removes the precoated sand in iron flask and mould, repeats step S1.
Beneficial effect: compared to the prior art iron flask sand-covering technique, is applied to vermicular cast iron engine cylinder by the program In lid casting, it is cast with the sand mold shell of rigidity owing to iron flask covers sand so that sand mold bulk strength is high, indeformable, decreases Deformation during casting pouring, and position reliable, precision height, foundry goods is also more prone to the demoulding simultaneously;Casting before right Former ferrum fused solution carries out creepage rate, it is possible to be effectively improved the heat conductivity of foundry goods, the thermal stress produced under the conditions of alternating temperature-changing Less, and intensity is higher;It is difficult to stress by the foundry goods of creepage rate concentrate, thus its thermal fatigue resistance is than magnesium iron and ash casting Ferrum is the best;Graphite paint is added, it is possible to reduce the surface roughness of foundry goods, avoid the impurity in precoated sand simultaneously covering to be coated with on layer of sand Enter foundry goods, affect the total quality of foundry goods.
Further, using the mode of upright casting in described step S6 during cast, i.e. during cast, iron flask and mould stand up;Use The mode of upright casting, former ferrum fused solution has certain downforce under the effect of self gravitation, makes the foundry goods quality of cast more Densification, casting quality is higher.
Further, the sand layer thickness that covers in described step S2 is 3~8mm, is adapted to various sizes of cylinder cap.
Further, the heating-up temperature of the former ferrous solution in described step S5 is 1420~1520 DEG C, and vermicular cast iron is heated molten The temperature melted should strictly control, when temperature is less than 1420 DEG C, and the poor fluidity of compacted ferrum, impact cast;Temperature is higher than 1520 DEG C Time, then can destroy the crystal structure of compacted ferrum.
Further, the preheating temperature in described step S3 is 180~250 DEG C, when temperature is less than 180 DEG C, does not reaches mould The operating temperature of tool, can affect the surface quality of foundry goods;When temperature is higher than 250 DEG C, the shrinkage factor of foundry goods hardening reduces, and band is cast During part cooling molding, hole situation easily occurs.
Further, the drying temperature in described step S2 is 150~200 DEG C.When temperature is less than 150 DEG C, drying effect is not Enough;When temperature is higher than 200 DEG C, it is easily caused and covers layer of sand specific surface overdrying, and it is internally dry insufficient to cover layer of sand.
Detailed description of the invention
Below by detailed description of the invention, the present invention is further detailed explanation, this compacted ferrum engine cylinder cover pourer Concretely comprising the following steps of skill:
Step one, matched moulds preheats, and mould has a profile adapted with iron flask in-profile, assemble iron flask and mould and Centre is left gap formation and is covered sand cavity, and the THICKNESS CONTROL covering sand cavity is more suitable 3~8mm, uses natural gas stove to add Hot iron sandbox and mould preheat, and control temperature and are advisable at 180~250 DEG C;
Step 2, adds sand hardening: to described in step one cover sand cavity in inject precoated sand, core-shooting process uses special covering Sand machine is carried out, and heating, drying makes precoated sand hardening skinning, is formed and covers layer of sand, and heating and temperature control is suitable at 150~200 DEG C.
Step 3, coating: the separately mould after precoated sand hardening and iron flask, by described iron flask and die flip to covering Layer of sand upward, uses brushing to graphite coating covering layer of sand surface, and blows away the dust covering layer of sand surface with high pressure air rifle;
Step 4, organizes case: the iron flask after coating in step 3 and mould are re-assemblied, and middle part forms the type for cast Chamber;
Step 5, standby potting syrup: prepare former ferrum fused solution in high-temperature smelting pot, and carry out creepage rate, add the most before casting Enter vermiculizer, as front the more commonly used vermiculizer has magnesium alloy, titanium alloy, rare earth etc., to make vermicular cast iron, heating-up temperature control System is at 1420~1520 DEG C;
Step 6, cast: carry out in the former ferrum fused solution after creepage rate in step 5 is joined the die cavity described in step 4 Cast, stands up iron flask and mould during cast, even if the side of cylinder cap die cavity is in vertical direction, the coldest after casting complete But;
Step 7, pickup: open iron flask and mould, take out foundry goods, remove the precoated sand in iron flask and mould, repeat step One is circulated operation.

Claims (6)

1. a compacted ferrum engine cylinder cover pouring technology, it is characterised in that include following operation:
S1, matched moulds preheat: assemble iron flask and mould and leave gap in centre and formed and cover sand cavity;
S2, add sand hardening: to described in step S1 cover sand cavity in inject precoated sand, heating, drying makes precoated sand harden Film, is formed and covers layer of sand;
S3, coating: the separately mould after precoated sand hardening and iron flask, by described iron flask and die flip to covering layer of sand court On, coat water-based graphite coating on described layer of sand surface of covering, and heat iron flask and mould carries out preheating and makes water-based graphite be coated with The moisture evaporation of material;
S4, group case: the iron flask after coating in step S3 and mould being re-assemblied, middle part forms the die cavity for cast;
S5, standby potting syrup: in high-temperature smelting pot, prepare former ferrum fused solution, and carry out creepage rate;
S6, cast: pour into a mould in the former ferrum fused solution after creepage rate in step S5 is joined the die cavity described in step S4, Natural cooling after casting complete;
S7, pickup: open iron flask and mould, take out foundry goods, removes the precoated sand in iron flask and mould, repeats step S1.
Compacted ferrum engine cylinder cover pouring technology the most according to claim 1, it is characterised in that: in described step S6 during cast Using the mode of upright casting, i.e. during cast, iron flask and mould stand up.
Compacted ferrum engine cylinder cover pouring technology the most according to claim 1, it is characterised in that: described step S2 covers sand Layer thickness is 3~8mm.
4. according to the compacted ferrum engine cylinder cover pouring technology described in Claims 2 or 3, it is characterised in that: in described step S5 The heating-up temperature of former ferrous solution is 1420~1520 DEG C.
Compacted ferrum engine cylinder cover pouring technology the most according to claim 4, it is characterised in that: the preheating in described step S3 Temperature is 180~250 DEG C.
Compacted ferrum engine cylinder cover pouring technology the most according to claim 5, it is characterised in that: the drying in described step S2 Temperature is 150~200 DEG C.
CN201610732037.2A 2016-08-26 2016-08-26 Compacted ferrum engine cylinder cover pouring technology CN106077470A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610732037.2A CN106077470A (en) 2016-08-26 2016-08-26 Compacted ferrum engine cylinder cover pouring technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610732037.2A CN106077470A (en) 2016-08-26 2016-08-26 Compacted ferrum engine cylinder cover pouring technology

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CN106077470A true CN106077470A (en) 2016-11-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107199315A (en) * 2017-04-27 2017-09-26 柳州聚龙科技有限公司 The casting method of brake disc
CN107282872A (en) * 2017-08-21 2017-10-24 马鞍山市三川机械制造有限公司 A kind of surface treatment method of Automobile flywheel shell casting mould
CN107457366A (en) * 2017-07-04 2017-12-12 江苏凌特精密机械有限公司 A kind of gasoline pump cover production technology

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CN102912214A (en) * 2012-10-31 2013-02-06 佛山市顺德区中天创展球铁有限公司 Ductile cast iron as well as ductile cast iron piston and casting process thereof
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US20100155010A1 (en) * 2007-07-05 2010-06-24 Fritz Winter Eisengieberei Gmbh & Co. Kg Process for casting a metal melt
CN101380668A (en) * 2008-08-19 2009-03-11 侯马市模范机械制造有限公司 Iron sand lined steel casting horizontal type shaping, vertical pouring casing method
CN102319873A (en) * 2011-10-10 2012-01-18 广西玉林玉柴机器配件制造有限公司 The production method of Iron Mould Coated Sand cast block
CN102380586A (en) * 2011-10-18 2012-03-21 浙江省机电设计研究院有限公司 Device and production method for manufacturing automobile rear axle cast through metal mold with sand lining
CN102912214A (en) * 2012-10-31 2013-02-06 佛山市顺德区中天创展球铁有限公司 Ductile cast iron as well as ductile cast iron piston and casting process thereof
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107199315A (en) * 2017-04-27 2017-09-26 柳州聚龙科技有限公司 The casting method of brake disc
CN107457366A (en) * 2017-07-04 2017-12-12 江苏凌特精密机械有限公司 A kind of gasoline pump cover production technology
CN107282872A (en) * 2017-08-21 2017-10-24 马鞍山市三川机械制造有限公司 A kind of surface treatment method of Automobile flywheel shell casting mould

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Application publication date: 20161109

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