CN105369003A - Preparing method for an inoculant for cam shaft and application of nucleating agent - Google Patents

Preparing method for an inoculant for cam shaft and application of nucleating agent Download PDF

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Publication number
CN105369003A
CN105369003A CN201510725444.6A CN201510725444A CN105369003A CN 105369003 A CN105369003 A CN 105369003A CN 201510725444 A CN201510725444 A CN 201510725444A CN 105369003 A CN105369003 A CN 105369003A
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CN
China
Prior art keywords
camshaft
nucleating agent
molten iron
application
median size
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Legal status (The legal status 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 status listed.)
Pending
Application number
CN201510725444.6A
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Chinese (zh)
Inventor
韩岗
马银强
林志国
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CHENGDU HONGYUAN FOUNDRY MATERIAL Co Ltd
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CHENGDU HONGYUAN FOUNDRY MATERIAL Co Ltd
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Priority to CN201510725444.6A priority Critical patent/CN105369003A/en
Publication of CN105369003A publication Critical patent/CN105369003A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • C21C1/105—Nodularising additive agents

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses a preparing method for an inoculant for a cam shaft. The preparing method includes the following steps that 60-75% of Si, 0.01-1.0% of Al, 0.05-0.5% of Ca, 0.1-1.0% of Ba, 3-5% of Cr, 0.03-0.05% of V, 5-8% of Nd, 0-1% of Mn and the balance Fe which are evenly mixed are smelted, stirred, cooled and crushed; then Fe3O4 powder is mixed; and the mixture is pressed into a cluster and then crushed. The invention further discloses specific application of the inoculant for the cam shaft. By means of the inoculant for the cam shaft, the comprehensive performance of the cam shaft can be improved, and the inoculating efficiency is improved.

Description

A kind of preparation method of camshaft nucleating agent and application thereof
Technical field
The invention belongs to nucleating agent technical field, the preparation method of particularly special during a kind of camshaft nucleating agent, and the application in camshaft prepared by this nucleating agent.
Background technology
Nucleating agent is that one can promote that graphite is formed, reduces chilling tendency, improves graphite form and distribution situation, increases the additive of eutectic cell quantity, refinement matrix.Most popular 75 silicon iron inoculator at present.
Chilled Camshaft is one of key part of motor car engine.Along with the development of automotive industry, its engine power is more and more higher, also more and more higher to camshaft performance requriements.Owing to having very high contact stress and relative sliding velocity faster between cam face and tappet, and produce high temperature in Machine Movement Process, so often occur scratch, spot corrosion, wearing and tearing, edge be full of cracks at cam face and the defect such as to peel off.Chilled Camshaft requires that cam (chill zone) has very high wear resistance and resistance to flaking, but not processing axle journal (non-chill zone) has certain toughness, supports axle journal and have good processing characteristics, therefore the complex manufacturing of camshaft, difficulty are large.
The camshaft that 75 silicon iron inoculator adopting existing foundry industry to adopt are produced has a lot of weak point in metallographic structure, hardness, wear resistance, processing characteristics etc., causes product unstable.In order to improve above-mentioned deficiency, part producer starts in silicon iron inoculator, increase other material and prepares composite inoculant, as chromium, rare earth etc.But, when adding above-mentioned materials, new problem can be introduced, the over-all properties of camshaft can not be improved simultaneously.Although can be conducive to the formation of camshaft white structure as added chromium, it can make the heart portion of camshaft produce cementite, and then causes camshaft hardness to decline.
Summary of the invention
Object of the present invention is just for above-mentioned the deficiencies in the prior art, provides one to be applicable to chill zone and non-chill zone simultaneously, and can improve the preparation method of the camshaft nucleating agent of the many-sided performance of camshaft simultaneously.
Another object of the present invention is to provide the application of above-mentioned camshaft nucleating agent in camshaft casting.
For achieving the above object, the present invention takes following technical scheme:
A kind of preparation method of camshaft nucleating agent, comprise the following steps: by weight percentage, by Si:60 ~ 75%, Al:0.01 ~ 1.0%, Ca:0.05 ~ 0.5%, Ba:0.1 ~ 1.0%, Cr:3 ~ 5%, V:0.03 ~ 0.05%, Nd:5 ~ 8%, Mn:0 ~ 1%, surplus is put into vacuum electric furnace after Fe mixes, use argon replaces furnace air, intensification melting 5 ~ 10min, do not stop in the process of melting to stir, raw material is mixed, vacuum cooling forms block, block is ground into the powdered alloy that median size is 50 ~ 100 μm,
Be the Fe of 0.5 ~ 1.5% by the above-mentioned powdered alloy obtained and median size at the weight percent of 50 ~ 100 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 3 ~ 5% joins in rolling device together to be suppressed agglomerating, and it is 200 ~ 500 μm that final powder is broken into median size.
Further, described raw material comprises the Mn of by weight percentage 0.5 ~ 1% further.
An application for camshaft nucleating agent, obtain foundry goods by three inoculation, the incubation time controls within 10min.
Further, when first time breeds, in container, add quality be equivalent to molten iron total mass 0.05%, particle diameter is the nucleating agent of 400 ~ 500 μm.
Further, when the molten iron added reach container volume two/for the moment, be evenly sprinkled into molten iron total mass 0.025%, particle diameter is the nucleating agent of 300 ~ 400 μm, carries out second time inoculation.
Further, when the molten iron added reaches 3/4ths of container volume, add molten iron total mass 0.025% with molten iron, particle diameter is the nucleating agent of 200 ~ 300 μm.
Further, the molten iron bred pours into camshaft cast model, becomes cam shaft blank after cooling.
Above-mentioned camshaft nucleating agent technical scheme provided by the invention has following beneficial effect: by adding Fe 3o 4eutectic check figure can be increased, the ability suppressing iron carbide preferably can be obtained when nucleating agent addition is low, and improve repetition rate and stability, extend the incubation time; Cr, V of adding can reduce the difference of stability series eutectic temperature and Jie's stability eutectic temperature, formed at Quench position densification, evenly, white structure clearly, obtain evenly chill depth; Nd not only has the phenomenon preventing the segregations such as phosphorus, can also stop the generation of different in nature graphite, obtains A type graphite; The synergies such as Al, Ca, Ba, Si of adding, can improve the mechanical property of camshaft, make camshaft have good tensile strength and wear resistance; Al, Ba, Mn of adding improve processability and the use properties of camshaft; The Ba added can promote perlite forming element, can increase either pearlite occurred, refine pearlite, improves cast iron intensity; The nucleating agent structure (200 ~ 500 μm) of refinement can be dispersed in molten iron, increases the contact area of its residual molten steel, improves inoculation efficiency; Incubation time is long, can reduce nucleation ability, for preventing the decline of nucleating agent, adds the time controling filling with molten iron in molten iron to container first in container within 10min.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1 (preparing nucleating agent)
The Si of 60% by weight percentage, the Al of 1.0%, the Ca of 0.5%, the Ba of 1.0%, the Cr of 5%, the V of 0.05%, the Nd of 8%, put into vacuum electric furnace after the Mn of the 1% and Fe of 23.45% mixes, use argon replaces furnace air, intensification melting 5min, do not stop in the process of melting to stir, raw material is mixed, and vacuum cooling forms block, block is ground into the powdered alloy that median size is 50 μm; Be the Fe of 1.5% by the above-mentioned powdered alloy obtained and median size at the weight percent of 50 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 5% joins in rolling device together to be suppressed agglomerating, and it is 200 μm that final powder is broken into median size.
Embodiment 2 (preparing nucleating agent)
The Si of 75% by weight percentage, the Al of 0.01%, the Ca of 0.05%, the Ba of 0.1%, vacuum electric furnace is put into after the Cr of 3%, the V of 0.03%, the Nd of 5% and the Fe of 16.81% mix, use argon replaces furnace air, intensification melting 10min, does not stop in the process of melting to stir, raw material is mixed, vacuum cooling forms block, block is ground into the powdered alloy that median size is 100 μm; Be the Fe of 0.5% by the above-mentioned powdered alloy obtained and median size at the weight percent of 100 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 3% joins in rolling device together to be suppressed agglomerating, and it is 500 μm that final powder is broken into median size.
Embodiment 3 (preparing nucleating agent)
The Si of 65% by weight percentage, the Al of 0.05%, the Ca of 0.3%, the Ba of 0.5%, vacuum electric furnace is put into after the Fe of the Cr of 4.5%, the V of 0.05%, the Nd of 7.5%, the Mn of 1% and 21.1% mixes, use argon replaces furnace air, intensification melting 6min, does not stop in the process of melting to stir, raw material is mixed, vacuum cooling forms block, block is ground into the powdered alloy that median size is 80 μm; Be the Fe of 1% by the above-mentioned powdered alloy obtained and median size at the weight percent of 80 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 3% joins in rolling device together to be suppressed agglomerating, and it is 300 μm that final powder is broken into median size.
Embodiment 4 (preparing nucleating agent)
The Si of 70% by weight percentage, the Al of 0.03%, the Ca of 0.1%, the Ba of 0.2%, vacuum electric furnace is put into after the Fe of the Cr of 3.5%, the V of 0.03%, the Nd of 5.5%, the Mn of 0.5% and 20.14% mixes, use argon replaces furnace air, intensification melting 8min, does not stop in the process of melting to stir, raw material is mixed, vacuum cooling forms block, block is ground into the powdered alloy that median size is 60 μm; Be the Fe of 0.5% by the above-mentioned powdered alloy obtained and median size at the weight percent of 100 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 5% joins in rolling device together to be suppressed agglomerating, and it is 250 μm that final powder is broken into median size.
Embodiment 5 (application of nucleating agent)
In camshaft castingprocesses, in hot metal ladle, add quality be equivalent to molten iron total mass 0.05%, particle diameter is the nucleating agent of 400 μm, again chilled cast iron or magnesium iron become molten iron by furnace melting and pour hot metal ladle, when the molten iron added reach hot metal ladle volume two/for the moment, evenly be sprinkled into molten iron total mass 0.025%, particle diameter is the camshaft nucleating agent of 300 μm, when the molten iron added reaches 3/4ths of hot metal ladle volume, molten iron total mass 0.025% is added with molten iron, particle diameter is the camshaft nucleating agent of 200 μm, incubation time controls within 10min, the molten iron bred pours into camshaft cast model, cam shaft blank is become after cooling.
Embodiment 6 (application of nucleating agent)
In camshaft castingprocesses, in hot metal ladle, add quality be equivalent to molten iron total mass 0.05%, particle diameter is the nucleating agent of 500 μm, again chilled cast iron or magnesium iron become molten iron by furnace melting and pour hot metal ladle, when the molten iron added reach hot metal ladle volume two/for the moment, evenly be sprinkled into molten iron total mass 0.025%, particle diameter is the camshaft nucleating agent of 400 μm, when the molten iron added reaches 3/4ths of hot metal ladle volume, molten iron total mass 0.025% is added with molten iron, particle diameter is the camshaft nucleating agent of 300 μm, incubation time controls within 10min, the molten iron bred pours into camshaft cast model, cam shaft blank is become after cooling.
Embodiment 7 (application of nucleating agent)
In camshaft castingprocesses, in hot metal ladle, add quality be equivalent to molten iron total mass 0.05%, particle diameter is the nucleating agent of 450 μm, again chilled cast iron or magnesium iron become molten iron by furnace melting and pour hot metal ladle, when the molten iron added reach hot metal ladle volume two/for the moment, evenly be sprinkled into molten iron total mass 0.025%, particle diameter is the camshaft nucleating agent of 350 μm, when the molten iron added reaches 3/4ths of hot metal ladle volume, molten iron total mass 0.025% is added with molten iron, particle diameter is the camshaft nucleating agent of 250 μm, incubation time controls within 10min, the molten iron bred pours into camshaft cast model, cam shaft blank is become after cooling.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.

Claims (7)

1. a preparation method for camshaft nucleating agent, is characterized in that, comprises the following steps:
(1) by weight percentage 60 ~ 75% Si, the Al of 0.01 ~ 1.0%, the Ca of 0.05 ~ 0.5%, the Ba of 0.1 ~ 1.0%, the Cr of 3 ~ 5%, the V of 0.03 ~ 0.05%, the Nd of 5 ~ 8%, the Mn of 0 ~ 1% and surplus are put into vacuum electric furnace after the raw material of Fe mixes, and use argon replaces furnace air, intensification melting 5 ~ 10min, do not stop in the process of melting to stir, raw material is mixed, and vacuum cooling forms block, block is ground into the powdered alloy that median size is 50 ~ 100 μm;
(2) be the Fe of 0.5 ~ 1.5% by the above-mentioned powdered alloy obtained and median size at the weight percent of 50 ~ 100 μm 3o 4powder joins in mixing vessel, after mixing and powdered alloy and Fe 3o 4the sodium silicate solution of powder gross weight 3 ~ 5% joins in rolling device together to be suppressed agglomerating, and it is 200 ~ 500 μm that final powder is broken into median size.
2. the preparation method of camshaft nucleating agent according to claim 1, is characterized in that, described raw material comprises the Mn of by weight percentage 0.5 ~ 1% further.
3. the application of camshaft nucleating agent according to claim 1 in camshaft casting, it is characterized in that, obtain foundry goods by three inoculation, the incubation time controls within 10min.
4. the application of camshaft nucleating agent according to claim 3 in camshaft casting, it is characterized in that, when first time breeds, in container, add quality be equivalent to molten iron total mass 0.05%, particle diameter is the camshaft nucleating agent of 400 ~ 500 μm.
5. the application of camshaft nucleating agent according to claim 3 in camshaft casting, it is characterized in that, when the molten iron added reach container volume two/for the moment, evenly be sprinkled into molten iron total mass 0.025%, particle diameter is the camshaft nucleating agent of 300 ~ 400 μm, carries out second time inoculation.
6. the application of camshaft nucleating agent according to claim 3 in camshaft casting, it is characterized in that, when the molten iron added reaches 3/4ths of container volume, add molten iron total mass 0.025% with molten iron, particle diameter is the camshaft nucleating agent of 200 ~ 300 μm.
7., according to the application of the arbitrary described camshaft nucleating agent of claim 3-6 in camshaft casting, it is characterized in that, the molten iron bred pours into camshaft cast model, becomes cam shaft blank after cooling.
CN201510725444.6A 2015-10-30 2015-10-30 Preparing method for an inoculant for cam shaft and application of nucleating agent Pending CN105369003A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377902A (en) * 2017-08-01 2017-11-24 浙江博星工贸有限公司 The melting inoculated technology of engine cam

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102808127A (en) * 2012-09-05 2012-12-05 石家庄金刚凯源动力科技有限公司 Special inoculant for centrifugally casting thin-wall dry cylinder liner
CN104195414A (en) * 2014-08-18 2014-12-10 成都宏源铸造材料有限公司 Preparation method and application of silicon granule nucleating agent
CN104962802A (en) * 2014-08-14 2015-10-07 成都宏源铸造材料有限公司 Inoculation agent for camshaft and preparation method and application thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102808127A (en) * 2012-09-05 2012-12-05 石家庄金刚凯源动力科技有限公司 Special inoculant for centrifugally casting thin-wall dry cylinder liner
CN104962802A (en) * 2014-08-14 2015-10-07 成都宏源铸造材料有限公司 Inoculation agent for camshaft and preparation method and application thereof
CN104195414A (en) * 2014-08-18 2014-12-10 成都宏源铸造材料有限公司 Preparation method and application of silicon granule nucleating agent

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377902A (en) * 2017-08-01 2017-11-24 浙江博星工贸有限公司 The melting inoculated technology of engine cam

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Application publication date: 20160302