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 PDFInfo
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- 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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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000005266 casting Methods 0.000 title claims abstract description 68
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 63
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000004576 sand Substances 0.000 claims description 58
- 238000005507 spraying Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 239000002994 raw material Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 238000007711 solidification Methods 0.000 claims description 12
- 230000008023 solidification Effects 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000011534 incubation Methods 0.000 claims description 5
- 238000011081 inoculation Methods 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000003746 surface roughness Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000007528 sand casting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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 ℃.
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Effective date of registration: 20240927 Address after: No. 8, Gaodong and Gaoxi Groups, Industrial Park, Taixing City, Taizhou City, Jiangsu Province, China 225400 Patentee after: Taizhou Pingtai Electronic Technology Co.,Ltd. Country or region after: China Address before: No. 18 Xiangyang Road, Taixing Town, Taixing City, Taizhou City, Jiangsu Province, China 225400 Patentee before: JIANGSU SONGLIN AUTOMOBILE PARTS Co.,Ltd. Country or region before: China |