CN102728790B - Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine - Google Patents

Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine Download PDF

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Publication number
CN102728790B
CN102728790B CN201210255964.1A CN201210255964A CN102728790B CN 102728790 B CN102728790 B CN 102728790B CN 201210255964 A CN201210255964 A CN 201210255964A CN 102728790 B CN102728790 B CN 102728790B
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China
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swage
sand
iron
core
mould
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CN201210255964.1A
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Chinese (zh)
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CN102728790A (en
Inventor
周国平
徐新元
陈进
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江苏松林汽车零部件有限公司
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Abstract

The invention discloses a sand-line iron mould casting process for grey cast iron flywheel housings of diesel engines. In the invention, upper and lower sand-line iron mould processes are used, so that produced grey cast iron flywheel housing blanks have favorable geometric size precision which can be up to CT8 grade, favorable surface roughness which can be up to 12.5 microns and favorable mechanical properties, the blank processing has small allowance which can be controlled in 3mm, small flashing distortion which can be controlled in 0.5mm and small cleaning workload, so that the labor environment is improved, the environmental protection is improved, the yield is high and can be up to 95%, and the national policies of energy conservation, environmental protection and sustainable development are met.

Description

A kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique
Technical field
The present invention relates to a kind of casting technique, is a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique specifically, and foundry goods has good geometric accuracy and surface quality, and blank allowance is little, good mechanical property.
Background technology
Bell housing is one of critical piece of diesel engine, and the supporting diesel engine of bell housing particularly the present invention relates to belongs to recently the high-end diesel engine of high-power from external introduction, and load is large, and complex-shaped, dimensional accuracy is high.Be the product that bell housing and gear chamber case unite two into one, after the inherent machined of gear chamber is good, must do hydrostatic test, pressure 0.6MPa, pressurize must not have drainage in 5 minutes, and quality requirement is higher.
The conventional cast technique of gray iron bell housing mainly adopts sand casting to comprise resin sand, tide mould sand moulding.Traditional handicraft process is as follows: adopt tide mould sand moulding, comprise after moulding by hand or machine molding or high pressure moulding, form casting mold and adopt resin sand coremaking, then play core, mould assembling, cast, cleaning.The mold stiffness made by above-mentioned casting technique is poor thereby surface quality of continuous castings is poor, the allowance of poor dimensional precision, blank is large, wall unevenness is even, material is unstable, water leakage ratio is high and technological operation is poor, worker laboring environment is poor, occupied ground is large.
Summary of the invention
In order to solve the deficiency of conventional art, the invention provides a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique, its surface quality of continuous castings is good, dimensional accuracy is high, reduce blank allowance, reduce foundry goods scrappage, has good mechanical properties.
Above-mentioned purpose of the present invention realizes by following technical solution: a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique: comprise that step is as follows:
(1) swage and Mold Making: according to bell housing casting dimension, make upper and lower mould, by upper and lower die size, leave the upper and lower swage of Fu Sha chamber respective production, on upper swage, casting system is set;
(2) upper and lower making molds:
(2a) upper swage and mold, lower swage and bed die are being covered to mould assembly preheating respectively on sand machine; After preheating, separately swage and mould, spray releasing agent at upper and lower mould outer wall, then mould assembly;
(2b) many sand-spraying holes on upper and lower swage will be full of precoated sand by compressed air in upper swage and mold, lower swage and bed die Jian Fusha chamber;
(2c) on every sand-spraying hole, prick a core, penetrate precoated sand 50-80mm; Core diameter 2-5mm;
(2d) precoated sand curing molding on upper and lower swage, solidification temperature 240-280 ℃, 30-40 second hardening time;
(2e) molding separately, hangs upper and lower mould by upper and lower swage;
(3) mud core is made:
(3a) according to bell housing casting dimension, make mud core core box, core box preheating, sprays releasing agent;
(3b) core box on core shooter with pressurized air impinges bell housing mud processed core;
(3c) molding after cured, solidification temperature 240-280 ℃, 30-40 second hardening time;
(4) lower core, mould assembling:
(4a) bell housing mud core is located on precoated sand in lower swage by core under bell housing casting dimension; (4b) the horizontal mould assembling of upper and lower swage, adopts alignment pin and guide finger to be seated upper and lower swage;
(4c) on the case ear of upper and lower swage, prize top box card, junner bush is installed on upper swage casting system top;
(5) raw material melting:
(5a) will in the middle frequency furnace of grey iron material input 1T, carry out melting, in intermediate frequency furnace, employing obtains original iron melt A after adding the mode of steel scrap, ferrosilicon, carburant to adjust chemical composition;
(5b) add inovulant to carry out inoculation in pouring ladle into time step original iron melt A, iron liquid B skims to obtain;
(6) raw material cast: the iron liquid B of step (5b) is poured in the casting mold that core step (4) play, mould assembling step obtain and cast by junner bush, and junner bush completely stops casting;
(7) shake out:
(7a) after cast, within 2-3 minute, destroy junner bush and down gate iron liquid all around cleaned out,
(7b) after cast, in 6-8 minute, unclamp case card, hang swage, take out foundry goods.
Further, described step 1. casting system is comprised of sprue, cross gate and ingate, sprue is vertically arranged at that on swage, to be communicated with swage outside, cross gate is arranged in upper iron shape and is communicated with sprue bottom along upper swage cross section bearing of trend, multiple tracks ingate is communicated with cross gate He Fusha chamber along upper swage cross section bearing of trend, and the sectional area ratio of each running channel is: A is straight: A is horizontal: in A=and 11.3cm 2: 8.4cm 2: 4.8cm 2=1:0.75:0.43.
Further, described step (2a) swage preheat temperature 240-280 ℃, mold preheating temperature 240-280 ℃.
Further, every sand-spraying hole 16mm of described step (2b), penetrates sand compressed air pressure 0.4-0.6MPa, and covering sand thickness is 8-10mm.
Further, described step (3a) core box preheat temperature 220-260 ℃, temperature retention time 4 minutes.
Further, described step (5a) gray iron raw material comprises new iron 80% and steel scrap 20%, smelting temperature 1510-1530 ℃, step (5a) is adjusted chemical composition C, Si in intermediate frequency furnace, its original iron melt A composition: W (C): 3.4-3.5%, W (Si): 1.4-1.6%, wherein the content of carbon is controlled by adding steel scrap or carburant, and the content of silicon is controlled by adding 75SiFe.
Further, the inovulant that described step (5b) adds is 75SiFe, granularity is 5-8mm, addition is the 0.3-0.5% of original iron melt A quality, incubation time 30-50 second, iron liquid B composition W (C): 3.4-3.5%, W (Si): 1.7-1.9%, W (Mn): 0.7-0.8%, 0 < W (P)≤0.1%, 0 < W (S)≤0.1%.Again further, described step (6) cast temperature 1350-1400 ℃.
The theoretical foundation of casting technique of the present invention is that molten steel solidification is theoretical, and molten steel solidification theory is volume contraction but time according to iron liquid cooling, indigenous graphite while solidifying.The fact of volumetric expansion, the expansive force that high trade mark gray iron produces is larger, if mold stiffness is poor, certainly will cause mould wall migration to cause die cavity to increase, and causes the foundry goods sand foundry goods physical dimension that rises to change, scab, thick large part shrinkage porosite phenomenon.Adopt casting mold sand-covering technique to compare with sand casting, the present invention has following remarkable advantage:
(1) the present invention adopts Iron Mould Coated Sand technique, and mold stiffness is good, and die cavity can not be subjected to displacement when molten iron generation graphitization expansion, thereby the sand phenomenon that rises of having stopped foundry goods, foundry goods geometric accuracy is high, and the dimensional uniformity of foundry goods is good, allowance can suitably reduce, and is conducive to reduce manufacturing cost;
(2) mud core of the present invention adopts hot box to make, and mud core pattern chamber surface quality is good, and final casting is little without burr, burr, dislocation-free, can greatly reduce cleaning work amount;
(3) the present invention adopts upper and lower swage casting, coordinates mud core and band core precoated sand to form cast chamber, and foundry goods cooling velocity is faster than common sand casting, and castings material is stable, mechanical property is good;
(4) the present invention adopts Iron Mould Coated Sand technique, makes sand using amount little, and environmental pollution is more much smaller than common sand casting, and workman's labour intensity and working environment are improved.
(5) after adopting iron liquid of the present invention to breed, promote iron liquid graphitization, improve the combination property of molten iron, avoid spoken parts in traditional operas to produce.
The present invention adopts Iron Mould Coated Sand explained hereafter gray iron flywheel blank, there is good geometric accuracy, can reach CT8 level, good surface roughness, can reach 12.5 μ m, good mechanical performance, stable material quality reaches HT250, blank allowance is little, can be controlled in 3mm, burr dislocation is little, within caning be controlled in 0.5mm, casting cleaning workload is little, reduce work strong, improve environmental pollution, casting yield is high, reach 95%, meet energy-saving and environmental protection, sustainable development policy that country advocates.
The specific embodiment
Fig. 1 is casting structure schematic diagram of the present invention;
Fig. 2 is Iron Mould Coated Sand structural representation in the present invention;
Fig. 3 is Iron Mould Coated Sand structural representation under the present invention;
Fig. 4 is cast structure schematic diagram of the present invention.
In figure: bell housing foundry goods 1, upper swage 2, lower swage 201, mold 3, bed die 301, sand-spraying hole 4,401, covers layer of sand 5,501, core 6,601, runner mould 7, sprue 701, cross gate 702, ingate 703, mud core 8.
The specific embodiment
Figure 1 shows that the cross section structure schematic diagram of diesel engine gray iron bell housing foundry goods 1.
Shown in Fig. 2, a kind of upper Iron Mould Coated Sand structural representation of Sand-Faced Metal Mould Casting technique of diesel engine gray iron bell housing, comprise swage 2, runner mould 7 and mold 3, the surface texture of mold is identical with the upper face structure of bell housing foundry goods, between upper swage and mold, mould assembly leaves Fu Sha chamber, in upper swage, be provided with runner mould, between upper swage and runner mould, leave equally Fu Sha chamber, upper swage is provided with the sand-spraying hole 4 in a plurality of Fu Sha of being communicated to chamber, many sand-spraying holes on upper swage cover layer of sand 5 by being full of precoated sand formation by compressed air in upper swage and mold Jian Fusha chamber, from every sand-spraying hole, pricking a core 6 penetrates and covers layer of sand.
Shown in Fig. 3, a kind of lower Iron Mould Coated Sand structural representation of Sand-Faced Metal Mould Casting technique of diesel engine gray iron bell housing, comprise lower swage 201 and bed die 301, the surface texture of bed die is identical with the bottom surface structure of bell housing foundry goods, between lower swage and bed die, mould assembly leaves Fu Sha chamber, lower swage is provided with the sand-spraying hole 401 in a plurality of Fu Sha of being communicated to chamber, many sand-spraying holes on lower swage form and to cover layer of sand 501 being full of precoated sand by compressed air in lower swage and bed die Jian Fusha chamber, prick a core 601 penetrate and cover layer of sand from every sand-spraying hole.
Shown in Fig. 4, cast structure schematic diagram of the present invention, is positioned over the mud core 8 of making on lower swage, with the upper and lower swage mould assembly that covers layer of sand.Wherein casting system is comprised of sprue 701, cross gate 702 and ingate 703, sprue is vertically arranged at that on swage, to be communicated with swage outside, cross gate is arranged in upper iron shape and is communicated with sprue bottom along upper swage cross section bearing of trend, multiple tracks ingate is communicated with cross gate He Fusha chamber along upper swage cross section bearing of trend, and the sectional area ratio of each running channel is: A is straight: A is horizontal: in A=and 11.3cm 2: 8.4cm 2: 4.8cm 2=1:0.75:0.43.
Embodiment mono-; Casting technique of the present invention comprises that step is as follows:
(1) swage and Mold Making: according to bell housing casting dimension, make upper and lower mould, by upper and lower die size, leave the upper and lower swage of Fu Sha chamber respective production, casting system and many sand-spraying holes are set on upper swage, many sand-spraying holes are set on lower swage;
(2) upper and lower making molds:
(2a) upper swage and mold, lower swage and bed die are being covered to mould assembly preheating respectively on sand machine, 240 ℃ of swage preheat temperatures, 240 ℃ of mold preheating temperatures; After preheating, separately swage and mould, spray releasing agent at upper and lower mould outer wall, then mould assembly;
(2b) many sand-spraying holes on upper and lower swage will be full of precoated sand by compressed air in upper swage and mold, lower swage and bed die Jian Fusha chamber, and every sand-spraying hole 16mm, penetrates sand compressed air pressure 0.4MPa, and covering sand thickness is 8mm;
(2c) on every sand-spraying hole, prick a core, penetrate precoated sand 50mm; Core diameter 2mm;
(2d) precoated sand curing molding on upper and lower swage, 240 ℃ of solidification temperatures, 30 seconds hardening times;
(2e) molding separately, hangs upper and lower mould by upper and lower swage;
(3) mud core is made:
(3a) according to bell housing casting dimension, make mud core core box, core box preheating, 220 ℃ of core box preheat temperatures, temperature retention time 4 minutes, sprays releasing agent;
(3b) core box on core shooter with pressurized air impinges bell housing mud processed core;
(3c) molding after cured, 240 ℃ of solidification temperatures, 30 seconds hardening times;
(4) lower core, mould assembling:
(4a) bell housing mud core is located on precoated sand in lower swage by core under bell housing casting dimension; (4b) the horizontal mould assembling of upper and lower swage, adopts alignment pin and guide finger to be seated upper and lower swage;
(4c) on the case ear of upper and lower swage, prize top box card, junner bush is installed on upper swage casting system top;
(5) raw material melting:
(5a) will in the middle frequency furnace of grey iron material input 1T, carry out melting, in intermediate frequency furnace, employing obtains original iron melt A after adding the mode of steel scrap, ferrosilicon, carburant to adjust chemical composition, gray iron raw material comprises new iron 80% and steel scrap 20%, 1510 ℃ of smelting temperatures, step (5a) is adjusted chemical composition C, Si in intermediate frequency furnace, its original iron melt A composition: W (C): 3.4-3.5%, W (Si): 1.4-1.6%, wherein the content of carbon is controlled by adding steel scrap or carburant, and the content of silicon is controlled by adding 75SiFe;
(5b) add inovulant to carry out inoculation in pouring ladle into time step original iron melt A, iron liquid B skims to obtain, the inovulant adding is 75SiFe, and granularity is 5-8mm, and addition is the 0.3-0.5% of original iron melt A quality, 30 seconds incubation times, iron liquid B composition W (C): 3.4-3.5%, W (Si): 1.7-1.9%, W (Mn): 0.7-0.8%, 0 < W (P)≤0.1%, 0 < W (S)≤0.1%;
(6) raw material cast: the iron liquid B of step (5b) is poured in the casting mold that core step (4) play, mould assembling step obtain and cast by junner bush, 1350 ℃ of cast temperatures, junner bush completely stops casting;
(7) shake out:
(7a) pour into a mould and within latter 2 minutes, destroy junner bush and down gate iron liquid is all around cleaned out,
(7b) pour into a mould in latter 6 minutes and unclamp case card, hang swage, take out foundry goods.
Embodiment bis-; Casting technique of the present invention comprises that step is as follows:
(1) swage and Mold Making: according to bell housing casting dimension, make upper and lower mould, by upper and lower die size, leave the upper and lower swage of Fu Sha chamber respective production, casting system and many sand-spraying holes are set on upper swage, many sand-spraying holes are set on lower swage;
(2) upper and lower making molds:
(2a) upper swage and mold, lower swage and bed die are being covered to mould assembly preheating respectively on sand machine, 260 ℃ of swage preheat temperatures, 260 ℃ of mold preheating temperatures; After preheating, separately swage and mould, spray releasing agent at upper and lower mould outer wall, then mould assembly;
(2b) many sand-spraying holes on upper and lower swage will be full of precoated sand by compressed air in upper swage and mold, lower swage and bed die Jian Fusha chamber, and every sand-spraying hole 16mm, penetrates sand compressed air pressure 0.5MPa, and covering sand thickness is 9mm;
(2c) on every sand-spraying hole, prick a core, penetrate precoated sand 70mm; Core diameter 4mm;
(2d) precoated sand curing molding on upper and lower swage, 260 ℃ of solidification temperatures, 35 seconds hardening times;
(2e) molding separately, hangs upper and lower mould by upper and lower swage;
(3) mud core is made:
(3a) according to bell housing casting dimension, make mud core core box, core box preheating, 240 ℃ of core box preheat temperatures, temperature retention time 4 minutes, sprays releasing agent;
(3b) core box on core shooter with pressurized air impinges bell housing mud processed core;
(3c) molding after cured, 260 ℃ of solidification temperatures, 35 seconds hardening times;
(4) lower core, mould assembling:
(4a) bell housing mud core is located on precoated sand in lower swage by core under bell housing casting dimension; (4b) the horizontal mould assembling of upper and lower swage, adopts alignment pin and guide finger to be seated upper and lower swage;
(4c) on the case ear of upper and lower swage, prize top box card, junner bush is installed on upper swage casting system top;
(5) raw material melting:
(5a) will in the middle frequency furnace of grey iron material input 1T, carry out melting, in intermediate frequency furnace, employing obtains original iron melt A after adding the mode of steel scrap, ferrosilicon, carburant to adjust chemical composition, gray iron raw material comprises new iron 80% and steel scrap 20%, 1520 ℃ of smelting temperatures, step (5a) is adjusted chemical composition C, Si in intermediate frequency furnace, its original iron melt A composition: W (C): 3.4-3.5%, W (Si): 1.4-1.6%, wherein the content of carbon is controlled by adding steel scrap or carburant, and the content of silicon is controlled by adding 75SiFe;
(5b) add inovulant to carry out inoculation in pouring ladle into time step original iron melt A, iron liquid B skims to obtain, the inovulant adding is 75SiFe, and granularity is 5-8mm, and addition is the 0.3-0.5% of original iron melt A quality, 40 seconds incubation times, iron liquid B composition W (C): 3.4-3.5%, W (Si): 1.7-1.9%, W (Mn): 0.7-0.8%, 0 < W (P)≤0.1%, 0 < W (S)≤0.1%;
(6) raw material cast: the iron liquid B of step (5b) is poured in the casting mold that core step (4) play, mould assembling step obtain and cast by junner bush, 1380 ℃ of cast temperatures, junner bush completely stops casting;
(7) shake out:
(7a) pour into a mould and within latter 2.5 minutes, destroy junner bush and down gate iron liquid is all around cleaned out,
(7b) pour into a mould in latter 7 minutes and unclamp case card, hang swage, take out foundry goods.
Embodiment tri-; Casting technique of the present invention comprises that step is as follows:
(1) swage and Mold Making: according to bell housing casting dimension, make upper and lower mould, by upper and lower die size, leave the upper and lower swage of Fu Sha chamber respective production, casting system and many sand-spraying holes are set on upper swage, many sand-spraying holes are set on lower swage;
(2) upper and lower making molds:
(2a) upper swage and mold, lower swage and bed die are being covered to mould assembly preheating respectively on sand machine, 280 ℃ of swage preheat temperatures, 280 ℃ of mold preheating temperatures; After preheating, separately swage and mould, spray releasing agent at upper and lower mould outer wall, then mould assembly;
(2b) many sand-spraying holes on upper and lower swage will be full of precoated sand by compressed air in upper swage and mold, lower swage and bed die Jian Fusha chamber, and every sand-spraying hole 16mm, penetrates sand compressed air pressure 0.6MPa, and covering sand thickness is 10mm;
(2c) on every sand-spraying hole, prick a core, penetrate precoated sand 80mm; Core diameter 5mm;
(2d) precoated sand curing molding on upper and lower swage, 280 ℃ of solidification temperatures, 40 seconds hardening times;
(2e) molding separately, hangs upper and lower mould by upper and lower swage;
(3) mud core is made:
(3a) according to bell housing casting dimension, make mud core core box, core box preheating, 260 ℃ of core box preheat temperatures, temperature retention time 4 minutes, sprays releasing agent;
(3b) core box on core shooter with pressurized air impinges bell housing mud processed core;
(3c) molding after cured, 280 ℃ of solidification temperatures, 40 seconds hardening times;
(4) lower core, mould assembling:
(4a) bell housing mud core is located on precoated sand in lower swage by core under bell housing casting dimension; (4b) the horizontal mould assembling of upper and lower swage, adopts alignment pin and guide finger to be seated upper and lower swage;
(4c) on the case ear of upper and lower swage, prize top box card, junner bush is installed on upper swage casting system top;
(5) raw material melting:
(5a) will in the middle frequency furnace of grey iron material input 1T, carry out melting, in intermediate frequency furnace, employing obtains original iron melt A after adding the mode of steel scrap, ferrosilicon, carburant to adjust chemical composition, gray iron raw material comprises new iron 80% and steel scrap 20%, 1530 ℃ of smelting temperatures, step (5a) is adjusted chemical composition C, Si in intermediate frequency furnace, its original iron melt A composition: W (C): 3.4-3.5%, W (Si): 1.4-1.6%, wherein the content of carbon is controlled by adding steel scrap or carburant, and the content of silicon is controlled by adding 75SiFe;
(5b) add inovulant to carry out inoculation in pouring ladle into time step original iron melt A, iron liquid B skims to obtain, the inovulant adding is 75SiFe, and granularity is 5-8mm, and addition is the 0.3-0.5% of original iron melt A quality, 50 seconds incubation times, iron liquid B composition W (C): 3.4-3.5%, W (Si): 1.7-1.9%, W (Mn): 0.7-0.8%, 0 < W (P)≤0.1%, 0 < W (S)≤0.1%;
(6) raw material cast: the iron liquid B of step (5b) is poured in the casting mold that core step (4) play, mould assembling step obtain and cast by junner bush, 1400 ℃ of cast temperatures, junner bush completely stops casting;
(7) shake out:
(7a) pour into a mould and within latter 3 minutes, destroy junner bush and down gate iron liquid is all around cleaned out,
(7b) pour into a mould in latter 8 minutes and unclamp case card, hang swage, take out foundry goods.

Claims (8)

1. a diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique, is characterized in that: comprise that step is as follows:
(1) swage and Mold Making: according to bell housing casting dimension, make upper and lower mould, by upper and lower die size, leave the upper and lower swage of Fu Sha chamber respective production, on upper swage, casting system is set;
(2) upper and lower making molds:
(2a) upper swage and mold, lower swage and bed die are being covered to mould assembly preheating respectively on sand machine; After preheating, separately swage and mould, spray releasing agent at upper and lower mould outer wall, then mould assembly;
(2b) many sand-spraying holes on upper and lower swage will be full of precoated sand by compressed air in upper swage and mold, lower swage and bed die Jian Fusha chamber;
(2c) on every sand-spraying hole, prick a core, penetrate precoated sand 50-80mm, core diameter 2-5mm;
(2d) precoated sand curing molding on upper and lower swage, solidification temperature 240-280 ℃, 30-40 second hardening time;
(2e) molding separately, hangs upper and lower mould by upper and lower swage;
(3) mud core is made:
(3a) according to bell housing casting dimension, make mud core core box, core box preheating, sprays releasing agent;
(3b) core box on core shooter with pressurized air impinges bell housing mud processed core;
(3c) molding after cured, solidification temperature 240-280 ℃, 30-40 second hardening time;
(4) lower core, mould assembling:
(4a) bell housing mud core is located on precoated sand in lower swage by core under bell housing casting dimension; (4b) the horizontal mould assembling of upper and lower swage, adopts alignment pin and guide finger to be seated upper and lower swage;
(4c) on the case ear of upper and lower swage, prize top box card, junner bush is installed on upper swage casting system top;
(5) raw material melting:
(5a) will in the middle frequency furnace of grey iron material input 1T, carry out melting, in intermediate frequency furnace, employing obtains original iron melt A after adding the mode of steel scrap, ferrosilicon, carburant to adjust chemical composition;
(5b) add inovulant to carry out inoculation in pouring ladle into time original iron melt A, iron liquid B skims to obtain;
(6) raw material cast: the iron liquid B of step (5b) is poured in the casting mold that core step (4) play, mould assembling step obtain and cast by junner bush, and junner bush completely stops casting;
(7) shake out:
(7a) after cast, within 2-3 minute, destroy junner bush and casting system mouth iron liquid is all around cleaned out;
(7b) after cast, in 6-8 minute, unclamp case card, hang swage, take out foundry goods.
2. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, it is characterized in that: described step (1) casting system is comprised of sprue, cross gate and ingate, sprue is vertically arranged at that on swage, to be communicated with swage outside, cross gate is arranged in upper iron shape and is communicated with sprue bottom along upper swage cross section bearing of trend, multiple tracks ingate arranges and is communicated with cross gate He Fusha chamber along upper swage cross section bearing of trend, and the sectional area ratio of each running channel is: A is straight: A is horizontal: in A=and 11.3cm 2: 8.4cm 2: 4.8cm 2=1:0.74:0.43.
3. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, is characterized in that: described step (2a) swage preheat temperature 240-280 ℃, mold preheating temperature 240-280 ℃.
4. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, is characterized in that: every sand-spraying hole 16mm of described step (2b), penetrate sand compressed air pressure 0.4-0.6MPa, and covering sand thickness is 8-10mm.
5. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, is characterized in that: described step (3a) core box preheat temperature 220-260 ℃, temperature retention time 4 minutes.
6. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, it is characterized in that: described step (5a) gray iron raw material comprises new iron 80% and steel scrap 20%, smelting temperature 1510-1530 ℃, step (5a) is adjusted chemical composition C, Si in intermediate frequency furnace, its original iron melt A composition: W (C): 3.4-3.5%, W (Si): 1.4-1.6%, wherein the content of carbon is controlled by adding steel scrap or carburant, and the content of silicon is controlled by adding ferrosilicon.
7. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, it is characterized in that: the inovulant that described step (5b) adds is ferrosilicon, granularity is 5-8mm, addition is the 0.3-0.5% of original iron melt A quality, incubation time 30-50 second, iron liquid B composition W (C): 3.4-3.5%, W (Si): 1.7-1.9%, W (Mn): 0.7-0.8%, 0 < W (P)≤0.1%, 0 < W (S)≤0.1%.
8. a kind of diesel engine grey cast-iron bell housing Sand-Faced Metal Mould Casting technique according to claim 1, is characterized in that: described step (6) cast temperature 1350-1400 ℃.
CN201210255964.1A 2012-07-24 2012-07-24 Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine CN102728790B (en)

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CN201210255964.1A CN102728790B (en) 2012-07-24 2012-07-24 Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210255964.1A CN102728790B (en) 2012-07-24 2012-07-24 Sand-line iron mould casting process for grey cast iron flywheel housing of diesel engine

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CN103143675A (en) * 2013-01-31 2013-06-12 洛阳新火种节能技术推广有限公司 Process for casting ball iron flywheel by iron model sand covering
CN103506585A (en) * 2013-10-17 2014-01-15 西峡县众德汽车部件有限公司 Shape following device and iron die sand coating process
CN103600036A (en) * 2013-10-23 2014-02-26 杭州德曼汽车零部件有限公司 Iron based coated sand casting technology for processing timing gear housing
CN103639370B (en) * 2013-11-29 2015-07-22 杨国能 Casting method for flywheel
CN105268948B (en) * 2014-12-30 2017-11-07 新兴重工湖北三六一一机械有限公司 A kind of aluminium bell housing low pressure metal mould
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CN104785713B (en) * 2015-05-06 2018-11-09 广东恒成科技股份有限公司 The casting mould and casting technique of die casting machine injection head plate
CN105108064A (en) * 2015-09-26 2015-12-02 侯马市晋烽机械铸造有限公司 Method for casting bearing cap on subway locomotive by using sand faced permanent iron molding technology
CN105108060A (en) * 2015-09-26 2015-12-02 侯马市晋烽机械铸造有限公司 Method for casting end cap of transmission end of traction motor on subway locomotive
CN105081231A (en) * 2015-09-26 2015-11-25 侯马市晋烽机械铸造有限公司 Casting method for hub of heavy truck
CN105328125A (en) * 2015-09-26 2016-02-17 侯马市晋烽机械铸造有限公司 Casting method of rotor pressing ring for metro locomotive
CN105108070A (en) * 2015-09-26 2015-12-02 侯马市晋烽机械铸造有限公司 Method for casting end cap of non-transmission end of traction motor on subway locomotive
CN105665651A (en) * 2016-04-11 2016-06-15 杨朝平 Flywheel casting mold
CN106077487A (en) * 2016-07-12 2016-11-09 湖州鼎盛机械制造有限公司 The Iron Mould Coated Sand technique of Large Crankshaft
CN106180566A (en) * 2016-07-16 2016-12-07 冯文杰 A kind of manufacturing technique method of engine air door closure casting
CN106077465A (en) * 2016-07-16 2016-11-09 冯文杰 A kind of grey cast-iron covers the manufacturing technique method of sand casting Complex Different Shape pipe
CN105921698A (en) * 2016-07-16 2016-09-07 冯文杰 Production method of sand-lined metal mold casting locomotive pipe fitting
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CN107671241A (en) * 2017-09-29 2018-02-09 侯马市晋烽机械铸造有限公司 A kind of Sand-Faced Metal Mould Casting technique for casting underground engines drive end bearing bracket
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CN108723724A (en) * 2018-08-18 2018-11-02 全椒县全动机械有限公司 A kind of flywheel shell of diesel engine preparation method
CN109773125A (en) * 2019-01-30 2019-05-21 浙江春晖复合材料有限公司 A kind of mold easy to use
CN110640087A (en) * 2019-10-11 2020-01-03 柳州市顺昇机械有限公司 Iron mold sand-lined production process of grouting sleeve

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