CN107619989A - The casting technique of high intensity vermicular cast iron material - Google Patents

The casting technique of high intensity vermicular cast iron material Download PDF

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Publication number
CN107619989A
CN107619989A CN201710797652.6A CN201710797652A CN107619989A CN 107619989 A CN107619989 A CN 107619989A CN 201710797652 A CN201710797652 A CN 201710797652A CN 107619989 A CN107619989 A CN 107619989A
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China
Prior art keywords
iron
molten iron
ladle
casting technique
cast iron
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CN201710797652.6A
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Chinese (zh)
Inventor
何春华
王春风
易致达
黎小春
刘峻才
辛泳霖
文桢富
秦栋
黄和江
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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Priority to CN201710797652.6A priority Critical patent/CN107619989A/en
Publication of CN107619989A publication Critical patent/CN107619989A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a kind of casting technique of high intensity vermicular cast iron material.The casting technique specific steps include:A, charge composition is by weight percentage steel scrap 40 60%, the pig iron 40 60%, the furnace charge prepared is placed on into melting in intermediate frequency furnace;B, after the completion of cast iron melting, the control concise temperature of molten iron is incubated more than 10 minutes between 1,520 1550 DEG C;C, a Si-Ca-Ba inovulant, rare earth magnesium vermiculizer are added in ladle, wherein, Si-Ca-Ba inovulant weight is to tap a blast furnace the 0.5 0.8% of water, using pouring method creepage rate molten iron in bag;D, using ladle-to-ladle with stream late inoculation, 0.1 0.2% silicon titanate innoculant for adding molten iron discharging weight carries out late inoculation;E, the good molten iron of inoculation is poured into sand mold type molds, duration of pouring control was completed in 10 minutes, and pouring temperature is controlled between 1,400 1460 DEG C.The casting technique reduces the shrinkage cavity shrinkage porosity tendency of product, promotes forming core generation during molten steel solidification, improves compacted iron material capability.

Description

The casting technique of high intensity vermicular cast iron material
Technical field
The present invention relates to engine art, more particularly to a kind of casting technique of high intensity vermicular cast iron material.
Background technology
Diesel engine cylinder head generally use has the high intensity of magnesium iron, while has the good of similar gray cast iron again The vermicular cast iron production of castability.Now the vermicular cast iron mode of production is:Furnace charge uses the pig iron, steel scrap, foundry return and other alloys Add in intermediate frequency furnace and be smelted into molten iron, composition after the assay was approved, rare earth magnesium vermiculizer (addition root is added in molten iron compactedization bag Depending on S contents), 0.3-0.5% inovulant of Si-Ca-Ba (inovulant granularity requirements 3-8mm), using Si-Ca-Ba once Inovulant is covered in above rare earth magnesium vermiculizer, and creepage rate is carried out using method is poured in bag.After the completion of molten iron compactedization, poured Note, 0.05-0.1% Si-Ca-Ba post inoculant is added with stream in cast, the relatively low vermicular cast iron of the performance that can be acquired Material.The vermicular cast iron performance being achieved in that is relatively low, at 15-25mm wall thickness, tensile strength generally≤400MPa, elongation percentage >=1%, Brinell hardness 170-200HB, nodulizing rate >=80%.
With the continuous upgrading of diesel engine, the cylinder head of the relatively low vermicular cast iron production of intensity is not suitable for diesel engine The requirement of upgrading, based on the requirement of high-power high detonation pressure diesel engine, then the continuous lifting of material is needed, to improve the product of product Matter, can so meet the needs of engine constantly upgrades.
The information for being disclosed in the background section is merely intended to understanding of the increase to the general background of the present invention, without answering It has been the prior art well known to persons skilled in the art when being considered as recognizing or implying the information structure in any form.
The content of the invention
, should it is an object of the invention to provide a kind of casting technique of the high intensity vermicular cast iron material of simple and reasonable steps The casting technique of high intensity vermicular cast iron material reduces the shrinkage cavity shrinkage porosity tendency of product, promotes forming core life during molten steel solidification Into, while the chilling tendency of casting is reduced, reduce the embrittlement of casting.Be advantageous to refine graphite, increase graphite, ensure that and fill Breeding for foot, improves compacted iron material capability.Effectively improve the tensile strength and hardness of vermicular cast iron.
To achieve the above object, the invention provides a kind of casting technique of high intensity vermicular cast iron material, specific steps Including:A, charge composition is by weight percentage steel scrap 40-60%, pig iron 40-60%, and the furnace charge prepared is placed on into intermediate frequency furnace Middle melting;B, after the completion of cast iron melting, the control concise temperature of molten iron is incubated more than 10 minutes between 1520-1550 DEG C;C, exist A Si-Ca-Ba inovulant, rare earth magnesium vermiculizer are added in ladle, wherein, Si-Ca-Ba inovulant weight is water of tapping a blast furnace 0.5-0.8%, sulfur content of the rare earth magnesium vermiculizer addition in base iron are adjusted, using pouring method compactedization place in bag Manage molten iron;D, using ladle-to-ladle with stream late inoculation, the silicon titanate innoculant progress for adding the 0.1-0.2% of molten iron discharging weight is secondary pregnant Educate;E, the good molten iron of inoculation is poured into sand mold type molds, duration of pouring control was completed in 10 minutes, and pouring temperature control exists Between 1400-1460 DEG C.
Preferably, in above-mentioned technical proposal, the furnace charge prepared is placed on melting in intermediate frequency furnace, when melted in stove have three/ After the molten iron of one amount, carborundum is added, while adds carburant and Carbon pick-up is carried out to molten iron, when load melting 4/5ths Afterwards, copper, ferrosilicon are added.
Preferably, in above-mentioned technical proposal, a tin is added in ladle.
Compared with prior art, the present invention has the advantages that:The casting technique of the high intensity vermicular cast iron material In charge composition, the addition of foundry return is eliminated, directly adds the pig iron to be produced using steel scrap, the shrinkage cavity of product can be reduced Shrinkage porosite is inclined to.In furnace charge melting, increase carborundum carries out melting, promotes forming core generation during molten steel solidification, while reduce casting The chilling tendency of part, reduce the embrittlement of casting.Improve pregnant amount and change late inoculation kind, be advantageous to refine graphite, increase Graphite, breeding for abundance is ensure that, improves compacted iron material capability.Optimize hot metal composition, tin composition is added in molten iron, is had Improve to effect the tensile strength and hardness of vermicular cast iron.
Brief description of the drawings
Fig. 1 is the flow chart of the casting technique of the high intensity vermicular cast iron material of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention Shield scope is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members Part or other parts.
As shown in figure 1, according to the specific of the casting technique of the high intensity vermicular cast iron material of the specific embodiment of the invention Step includes:
A, charge composition is steel scrap 40-60%, pig iron 40-60% by weight percentage.During the furnace charge prepared is placed on Melting in frequency stove, when melted in stove have the molten iron of about 1/3rd amounts after, addition carborundum, while add carburant and molten iron entered Row Carbon pick-up, after load melting 4/5ths, add copper, ferrosilicon etc..It is optimized, takes in the selection of furnace charge and proportioning Disappeared the use of foundry return, directly adds high-quality prompt industrial scrap using the pig iron, and the shrinkage cavity shrinkage porosity for advantageously reducing casting is inclined to; In the fusion process of molten iron, add carbofrax material and carry out melting, forming core is added for molten steel solidification, reduce casting spoken parts in traditional operas and incline To reduction casting embrittlement.
B, after the completion of cast iron melting, the control concise temperature of molten iron is incubated more than 10 minutes between 1520-1550 DEG C;Iron Water percentage chemical composition (WB%) is:C:3.3-3.8%, Si:1.3-1.7%, S:0.010-0.020%, Mn:0.3- 0.5%th, Cu:0.7-1.1%, Cr < 0.15%.
C, a Si-Ca-Ba inovulant, rare earth magnesium vermiculizer, tin are added in ladle, wherein, Si-Ca-Ba inovulant weight Measure and be adjusted, adopt for the 0.5-0.8% for water of tapping a blast furnace, S (sulphur) content of rare earth magnesium vermiculizer addition in base iron With pouring method creepage rate molten iron in bag.This patent adds a certain amount of Sn compositions and optimized in hot metal composition, can be with Effectively improve the tensile strength and hardness of vermicular cast iron.
D, using ladle-to-ladle with stream late inoculation, the silicon titanate innoculant progress for adding the 0.1-0.2% of molten iron discharging weight is secondary Breed.The vermicular cast iron now produced breeds mode using low, and the present invention is used according to by the way of intermediate frequency furnace melting The mode of big pregnant amount is bred, while optimizes the kind of post inoculant, using silicon titanate innoculant, and is increased and is bred Amount, breeding for abundance is ensure that, improves the performance of material.
E, the good molten iron of inoculation is poured into sand mold type molds, duration of pouring control was completed in 10 minutes, pouring temperature Control is between 1400-1460 DEG C.
The casting technique of the high intensity vermicular cast iron material improves the performance of material, and cylinder cover for diesel engine wall thickness is in 15- At 25mm, body tensile strength >=450MPa, elongation percentage >=1%, Brinell hardness 190-240HB, nodulizing rate >=80%.Molten iron Percentage chemical composition (WB%) is:C:3.3-3.8%, Si:2.0-2.5%, S:0.010-0.020%, Mn:0.3-0.5%, Cu:0.7-1.1%, Cr < 0.15%, Sn:0.07-0.10%.
To sum up, the casting technique of the high intensity vermicular cast iron material eliminates the addition of foundry return, directly in charge composition Connect and add the pig iron to be produced using steel scrap, the shrinkage cavity shrinkage porosity tendency of product can be reduced.In furnace charge melting, increase carborundum enters Row melting, promote forming core generation during molten steel solidification, while reduce the chilling tendency of casting, reduce the embrittlement of casting.Improve pregnant The amount of educating and change late inoculation kind, are advantageous to refine graphite, increase graphite, ensure that breeding for abundance, improve compacted iron Material capability.Optimize hot metal composition, tin composition is added in molten iron, effectively improve the tensile strength of vermicular cast iron and hard Degree.
The description of the foregoing specific illustrative embodiment to the present invention is to illustrate and the purpose of illustration.These descriptions It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed And change.The purpose of selecting and describing the exemplary embodiment is that explain that the certain principles of the present invention and its reality should With so that those skilled in the art can realize and utilize the present invention a variety of exemplaries and Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.

Claims (3)

1. a kind of casting technique of high intensity vermicular cast iron material, it is characterised in that specific steps include:
A, charge composition is by weight percentage steel scrap 40-60%, pig iron 40-60%, and the furnace charge prepared is placed on into intermediate frequency furnace Middle melting;
B, after the completion of cast iron melting, the control concise temperature of molten iron is incubated more than 10 minutes between 1520-1550 DEG C;
C, a Si-Ca-Ba inovulant, rare earth magnesium vermiculizer are added in ladle, wherein, Si-Ca-Ba inovulant weight is to tap a blast furnace The 0.5-0.8% of water, sulfur content of the rare earth magnesium vermiculizer addition in base iron are adjusted, using pouring method in bag Creepage rate molten iron;
D, using ladle-to-ladle with stream late inoculation, the silicon titanate innoculant for adding the 0.1-0.2% of molten iron discharging weight carries out late inoculation;
E, the good molten iron of inoculation is poured into sand mold type molds, duration of pouring control was completed in 10 minutes, pouring temperature control Between 1400-1460 DEG C.
2. the casting technique of high intensity vermicular cast iron material according to claim 1, it is characterised in that described to prepare Furnace charge is placed on melting in intermediate frequency furnace, when melted in stove have the molten iron of 1/3rd amounts after, addition carborundum, while add carburant Carbon pick-up is carried out to molten iron, after load melting 4/5ths, adds copper, ferrosilicon.
3. the casting technique of high intensity vermicular cast iron material according to claim 1, it is characterised in that described in ladle Tin of middle addition.
CN201710797652.6A 2017-09-06 2017-09-06 The casting technique of high intensity vermicular cast iron material Pending CN107619989A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109202013A (en) * 2018-10-22 2019-01-15 安徽大天铸业有限责任公司 A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting
CN109321813A (en) * 2018-10-09 2019-02-12 安徽大天铸业有限责任公司 A kind of high-intensity and high-tenacity vermicular cast iron diverter front cover cast casting technique
CN109371315A (en) * 2018-10-24 2019-02-22 东风商用车有限公司 A kind of high intensity vermicular cast iron and preparation method thereof
CN109468525A (en) * 2018-10-09 2019-03-15 安徽大天铸业有限责任公司 A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell
CN110170621A (en) * 2019-07-06 2019-08-27 安徽大天铸业有限责任公司 A kind of high nodulizing rate High Strength Hydraulic motor body shell rough-cast technique

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CN106011603A (en) * 2016-07-01 2016-10-12 宁国市开源电力耐磨材料有限公司 Smelting technology of high-strength vermicular graphite cast iron
CN106929750A (en) * 2017-05-13 2017-07-07 山东宏马工程机械有限公司 Compacted iron brake drum and preparation method thereof

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CN102071351A (en) * 2011-01-17 2011-05-25 重庆大学 Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109321813A (en) * 2018-10-09 2019-02-12 安徽大天铸业有限责任公司 A kind of high-intensity and high-tenacity vermicular cast iron diverter front cover cast casting technique
CN109468525A (en) * 2018-10-09 2019-03-15 安徽大天铸业有限责任公司 A kind of wear-resisting pieces of vermicular cast iron casting technique of BK series brake body shell
CN109321813B (en) * 2018-10-09 2019-10-18 安徽大天铸业有限责任公司 A kind of high-intensity and high-tenacity vermicular cast iron diverter front cover cast casting technique
CN109468525B (en) * 2018-10-09 2020-05-22 安徽大天铸业有限责任公司 Casting process of BK series brake body shell wear-resistant vermicular graphite iron casting
CN109202013A (en) * 2018-10-22 2019-01-15 安徽大天铸业有限责任公司 A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting
CN109371315A (en) * 2018-10-24 2019-02-22 东风商用车有限公司 A kind of high intensity vermicular cast iron and preparation method thereof
CN110170621A (en) * 2019-07-06 2019-08-27 安徽大天铸业有限责任公司 A kind of high nodulizing rate High Strength Hydraulic motor body shell rough-cast technique
CN110170621B (en) * 2019-07-06 2020-05-19 安徽大天铸业有限责任公司 High-creep-rate high-strength hydraulic motor shell blank casting process

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Application publication date: 20180123