CN110284071A - A kind of rotary kiln super large gear and preparation method thereof - Google Patents

A kind of rotary kiln super large gear and preparation method thereof Download PDF

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Publication number
CN110284071A
CN110284071A CN201910712632.3A CN201910712632A CN110284071A CN 110284071 A CN110284071 A CN 110284071A CN 201910712632 A CN201910712632 A CN 201910712632A CN 110284071 A CN110284071 A CN 110284071A
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gear
idiosome
rotary kiln
controlled
soaking time
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裴跃新
裴杨
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Yixing Jiaxin Numerical Control Technology Co Ltd
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Yixing Jiaxin Numerical Control Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The present invention relates to a kind of rotary kiln large gear and preparation method thereof, the preparation method includes the following steps: melting, casting forming, blank preheating, isothermal normalizing, turnery processing, rolling Gear Shaping, Shaving Process, selective hardening, tempering, carburizing, grinding, anti-corrosion.Advantageous embodiment is carried out by material, the manufacturing process to this gear, it is handled, make Hardness on Gear Teeth Surface and wear-resistant is significantly increased using selective hardening and carburization process with good mechanical performance, especially gear tooth, the fatigability for reducing gear, improves service life of gear；The advantages that make the entirety of rotary kiln device reach safe operation, reliable in quality, long service life, meet enterprise practical requirement.

Description

A kind of rotary kiln super large gear and preparation method thereof
Technical field
The present invention relates to a kind of gears and preparation method thereof, and in particular to one kind is for building materials, metallurgy, chemical industry, environmental protection etc. The rotary kiln that many industries use super large gear and preparation method thereof.
Background technique
Rotary kiln is to carry out mechanical, physical or chemical treatment to solid material by using revolving drum equipment, extensively Applied to building materials, in many industries such as metallurgy, chemical industry, environmental protection.Wherein in rotary kiln gear wheel as the equipment running part One of critical component, every mechanical performance index, will directly influence whole rotary kiln device traveling comfort and use Service life since quality problems occurs in gear wheel, often leads to rotary kiln damage, causes equipment and use the longevity in process of production The problems such as short, operating cost is high is ordered, the economic benefit of enterprise has been seriously affected.Therefore the performance indicator of gear wheel is the equipment system Emphasis, difficult point and the core of technology are made, how the process of optimization to be used to pass through system under the premise of meeting design requirement Fixed feasible technology ensuring scheme carries out quality monitoring to the links of Gear Processing, it is ensured that the high-quality and high-efficiency of Gear Processing It is very necessary.
Summary of the invention
Goal of the invention: the purpose of the present invention provides one kind and runs smoothly mainly for the deficiencies in the prior art, peace Complete reliable, applicable industry wide is wide, and the indexs such as material hardness, fatigue strength, wearability, obdurability improve comprehensively, and uses The rotary kiln large gear and preparation method thereof of service life length.
Technical solution: in order to solve the above-mentioned technical problem, a kind of rotary kiln large gear of the present invention, it is with weight The each group distribution ratio for measuring number meter is C:0.35~0.45%, Si:0.65~0.85%, Mn:0.75~0.85%, Cr:3.5~ 4.5%, Cu:0.1~0.2%, Ni:0.15~0.25%, Mo:0.25~0.45%, W:0.6-~1.4%, P :≤0.04%, S :≤ 0.02%, surplus Fe.
Its each component optimum ratio based on parts by weight is C:0.36~0.4%, Si:0.7~0.8%, Mn:0.76~ 0.84%, Cr:3.6~4.4%, Cu:0.12~0.18%, Ni:0.16~0.22%, Mo:0.3~0.4%, W:0.8~1.3%, P: ≤ 0.04%, S :≤0.02%, surplus Fe.
Its each component optimum ratio based on parts by weight is C:0.38%, Si:0.75%, Mn:0.80%, Cr:4.0%, Cu:0.16%, Ni:0.2%, Mo:0.35%, W:1%, P :≤0.04%, S :≤0.02%, surplus Fe.
A kind of preparation method of rotary kiln large gear, it includes the following steps,
(1) melting: each ratio component being added in intermediate frequency furnace and carries out melting, makes tapping temperature control at 1500~1600 DEG C, And silicon titanate innoculant and rare earth magnesium ferrosilicon alloy nodulizer are added in the molten iron of melting.
(2) castable: the molten iron disposal pouring of melting is entered in the mold by prefabricated loam core, gear idiosome is poured into Shape.
(3) blank preheats: gear idiosome being put into gas-fired heater and is heated, heating and temperature control is 330 ~450 DEG C, soaking time is controlled in 20~30min.
(4) isothermal normalizing: continuing to be heated to 900~950 DEG C for the gear green body of preheating, soaking time control 50~ 80min；Then to 580~630 DEG C, soaking time is controlled in 90~150min water cooling, is finally air-cooled to room temperature.
(5) tooth embryo, internal diameter, end face and outer turnery processing: are carried out to the gear green body that is cooled to room temperature using numerically controlled lathe The turnery processing of diameter.
(6) rolling, Gear Shaping: the gear idiosome after turnery processing carries out gear idiosome using gear-hobbing machine and gear shapping machine Rolling, Gear Shaping.
(7) after the completion of rolling, Gear Shaping, plunge shaving processing Shaving Process: is carried out to gear idiosome using gear shaving machine.
(8) selective hardening: after the completion of Shaving Process, using high-frequency quenching induction furnace to the teeth portion of gear green body and root into Row high-frequency induction isothermal hardening is heated to 900~930 DEG C to teeth portion and root first, and soaking time is controlled in 2~5min, so Tapping temperature control is immersed 5~15s in the diesel oil medium of normal temperature state and is disposably quenched between 910~920 DEG C afterwards.
(9) it is tempered: quenched gear idiosome is put into tempering furnace, temperature control is at 260~280 DEG C, soaking time Control then takes out in 50~60min and carries out being air-cooled to room temperature.
(10) carburizing: the gear idiosome after tempering is put into carburizer, 930~960 DEG C is heated to, teeth portion is seeped After carbon handles 60~90s, then takes out and carry out being air-cooled to room temperature.
(11) grinding: the gear internal diameter of the gear idiosome after Carburization Treatment, end face, outer diameter position are ground Cut finishing processing.
(12) anti-corrosion: by the gear idiosome after finishing, anti-corrosion maintenance is carried out using spray epoxy paint, obtains tooth Take turns finished product.
The utility model has the advantages that compared with prior art, the present invention its remarkable advantage is: passing through material, the manufacture work to this gear Skill carries out advantageous embodiment, uses at selective hardening and carburization process with good mechanical performance, especially gear tooth Reason, make Hardness on Gear Teeth Surface and it is wear-resistant significantly increased, reduce the fatigability of gear, improve service life of gear； The advantages that make the entirety of rotary kiln device reach safe operation, reliable in quality, long service life, meets enterprise practical use It is required that.
Specific embodiment
The present invention will be further explained by examples below.
Embodiment 1:
A kind of rotary kiln large gear of the present invention, its each group distribution ratio based on parts by weight is C:0.38%, Si: 0.75%, Mn:0.80%, Cr:4.0%, Cu:0.16%, Ni:0.2%, Mo:0.35%, W:1%, P :≤0.04%, S :≤0.02%, it is remaining Amount is Fe.
A kind of preparation method of rotary kiln large gear, it includes the following steps,
(1) melting: each ratio component being added in intermediate frequency furnace and carries out melting, makes tapping temperature control at 1580 DEG C, and molten Silicon titanate innoculant and rare earth magnesium ferrosilicon alloy nodulizer are added in the molten iron melted.
(2) castable: the molten iron disposal pouring of melting is entered in the mold by prefabricated loam core, gear idiosome is poured into Shape.
(3) blank preheats: gear idiosome being put into gas-fired heater and is heated, heating and temperature control is 400 DEG C, soaking time is controlled in 28min.
(4) isothermal normalizing: the gear green body of preheating is continued to be heated to 940 DEG C, soaking time is controlled in 70min；Then To 610 DEG C, soaking time is controlled in 120min water cooling, is finally air-cooled to room temperature.
(5) tooth embryo, internal diameter, end face and outer turnery processing: are carried out to the gear green body that is cooled to room temperature using numerically controlled lathe The turnery processing of diameter.
(6) rolling, Gear Shaping: the gear idiosome after turnery processing carries out gear idiosome using gear-hobbing machine and gear shapping machine Rolling, Gear Shaping.
(7) after the completion of rolling, Gear Shaping, plunge shaving processing Shaving Process: is carried out to gear idiosome using gear shaving machine.
(8) selective hardening: after the completion of Shaving Process, using high-frequency quenching induction furnace to the teeth portion of gear green body and root into Row high-frequency induction isothermal hardening is heated to 920 DEG C to teeth portion and root first, and soaking time is controlled in 5min, then furnace temperature out Degree control is immersed 10s in the diesel oil medium of normal temperature state and is disposably quenched at 916 DEG C.
(9) it is tempered: quenched gear idiosome is put into tempering furnace, at 270 DEG C, soaking time control exists for temperature control 56min then takes out and carries out being air-cooled to room temperature.
(10) carburizing: the gear idiosome after tempering being put into carburizer, is heated to 950 DEG C, is carried out at carburizing to teeth portion After managing 75s, then takes out and carry out being air-cooled to room temperature.
(11) grinding: the gear internal diameter of the gear idiosome after Carburization Treatment, end face, outer diameter position are ground Cut finishing.
(12) anti-corrosion: by the gear idiosome after finishing, anti-corrosion maintenance is carried out using spray epoxy paint, obtains tooth Take turns finished product.
Embodiment 2:
A kind of rotary kiln large gear of the present invention, its each group distribution ratio based on parts by weight is C:0.39%, Si: 0.76%, Mn:0.78%, Cr:3.8%, Cu:0.17%, Ni:0.19%, Mo:0.38%, W:1.1%, P :≤0.04%, S :≤0.02%, Surplus is Fe.
A kind of preparation method of rotary kiln large gear, it includes the following steps,
(1) melting: each ratio component being added in intermediate frequency furnace and carries out melting, makes tapping temperature control at 1570 DEG C, and molten Silicon titanate innoculant and rare earth magnesium ferrosilicon alloy nodulizer are added in the molten iron melted.
(2) castable: the molten iron disposal pouring of melting is entered in the mold by prefabricated loam core, gear idiosome is poured into Shape.
(3) blank preheats: gear idiosome being put into gas-fired heater and is heated, heating and temperature control is 410 DEG C, soaking time is controlled in 26min.
(4) isothermal normalizing: the gear green body of preheating is continued to be heated to 940 DEG C, soaking time is controlled in 80min；Then To 600 DEG C, soaking time is controlled in 130min water cooling, is finally air-cooled to room temperature.
(5) tooth embryo, internal diameter, end face and outer turnery processing: are carried out to the gear green body that is cooled to room temperature using numerically controlled lathe The turnery processing of diameter.
(6) rolling, Gear Shaping: the gear idiosome after turnery processing carries out gear idiosome using gear-hobbing machine and gear shapping machine Rolling, Gear Shaping.
(7) after the completion of rolling, Gear Shaping, plunge shaving processing Shaving Process: is carried out to gear idiosome using gear shaving machine.
(8) selective hardening: after the completion of Shaving Process, using high-frequency quenching induction furnace to the teeth portion of gear green body and root into Row high-frequency induction isothermal hardening is heated to 920 DEG C to teeth portion and root first, and soaking time is controlled in 5min, then furnace temperature out Degree control is immersed 13s in the diesel oil medium of normal temperature state and is disposably quenched at 920 DEG C.
(9) it is tempered: quenched gear idiosome is put into tempering furnace, at 272 DEG C, soaking time control exists for temperature control 56min then takes out and carries out being air-cooled to room temperature.
(10) carburizing: the gear idiosome after tempering being put into carburizer, is heated to 940 DEG C, is carried out at carburizing to teeth portion After managing 80s, then takes out and carry out being air-cooled to room temperature.
(11) grinding: the gear internal diameter of the gear idiosome after Carburization Treatment, end face, outer diameter position are ground Cut finishing.
(12) anti-corrosion: by the gear idiosome after finishing, anti-corrosion maintenance is carried out using spray epoxy paint, obtains tooth Take turns finished product.
Embodiment 3:
A kind of rotary kiln large gear of the present invention, its each group distribution ratio based on parts by weight is C:0.4%, Si: 0.7%, Mn:0.82%, Cr:3.9%, Cu:0.14%, Ni:0.17%, Mo:0.32%, W:0.85%, P :≤0.04%, S :≤0.02%, Surplus is Fe.
A kind of preparation method of rotary kiln large gear, it includes the following steps,
(1) melting: each ratio component being added in intermediate frequency furnace and carries out melting, makes tapping temperature control at 1600 DEG C, and molten Silicon titanate innoculant and rare earth magnesium ferrosilicon alloy nodulizer are added in the molten iron melted.
(2) castable: the molten iron disposal pouring of melting is entered in the mold by prefabricated loam core, gear idiosome is poured into Shape.
(3) blank preheats: gear idiosome being put into gas-fired heater and is heated, heating and temperature control is 410 DEG C, soaking time is controlled in 30min.
(4) isothermal normalizing: the gear green body of preheating is continued to be heated to 950 DEG C, soaking time is controlled in 75min；Then To 600 DEG C, soaking time is controlled in 120min water cooling, is finally air-cooled to room temperature.
(5) tooth embryo, internal diameter, end face and outer turnery processing: are carried out to the gear green body that is cooled to room temperature using numerically controlled lathe The turnery processing of diameter.
(6) rolling, Gear Shaping: the gear idiosome after turnery processing carries out gear idiosome using gear-hobbing machine and gear shapping machine Rolling, Gear Shaping.
(7) after the completion of rolling, Gear Shaping, plunge shaving processing Shaving Process: is carried out to gear idiosome using gear shaving machine.
(8) selective hardening: after the completion of Shaving Process, using high-frequency quenching induction furnace to the teeth portion of gear green body and root into Row high-frequency induction isothermal hardening is heated to 930 DEG C to teeth portion and root first, and soaking time is controlled in 4min, then furnace temperature out Degree control is immersed 10s in the diesel oil medium of normal temperature state and is disposably quenched at 916 DEG C.
(9) it is tempered: quenched gear idiosome is put into tempering furnace, at 265 DEG C, soaking time control exists for temperature control 50min then takes out and carries out being air-cooled to room temperature.
(10) carburizing: the gear idiosome after tempering being put into carburizer, is heated to 940 DEG C, is carried out at carburizing to teeth portion After managing 70s, then takes out and carry out being air-cooled to room temperature.
(11) grinding: the gear internal diameter of the gear idiosome after Carburization Treatment, end face, outer diameter position are ground Cut finishing.
(12) anti-corrosion: by the gear idiosome after finishing, anti-corrosion maintenance is carried out using spray epoxy paint, obtains tooth Take turns finished product.
A kind of rotary kiln large gear of the invention, main mechanical properties data see the table below:
Performance Tensile strength (MPa) Yield strength (MPa) Hardness (HB)
Detection data 750-1200 450-830 225-310
The present invention provides a kind of thinking and methods, and there are many method and the approach for implementing the technical solution, and the above is only It is the preferred embodiment of the present invention.It should be pointed out that those of ordinary skill in the art, not departing from original of the invention Under the premise of reason, several improvements and modifications can also be made, it is interior that these modifications and embellishments should also be considered as the scope of protection of the present invention, All undefined components in this embodiment can be implemented in the prior art.

Claims (4)

1. a kind of rotary kiln large gear, it is characterised in that: its each group distribution ratio based on parts by weight is, C:0.35~ 0.45%, Si:0.65~0.85%, Mn:0.75~0.85%, Cr:3.5~4.5%, Cu:0.1~0.2%, Ni:0.15~0.25%, Mo:0.25~0.45%, W:0.6-~1.4%, P :≤0.04%, S :≤0.02%, surplus Fe.
2. a kind of rotary kiln large gear according to claim 1, it is characterised in that: its each group based on parts by weight Dividing optimum ratio is C:0.36~0.4%, Si:0.7~0.8%, Mn:0.76~0.84%, Cr:3.6~4.4%, Cu:0.12~ 0.18%, Ni:0.16~0.22%, Mo:0.3~0.4%, W:0.8~1.3%, P :≤0.04%, S :≤0.02%, surplus Fe.
3. a kind of rotary kiln large gear according to claim 1, it is characterised in that: its each group based on parts by weight Dividing optimum ratio is C:0.38%, Si:0.75%, Mn:0.80%, Cr:4.0%, Cu:0.16%, Ni:0.2%, Mo:0.35%, W: 1%, P :≤0.04%, S :≤0.02%, surplus Fe.
4. a kind of preparation method of rotary kiln large gear according to claim 1 or 2 or 3, it is characterised in that: it is wrapped Include following steps:
(1) melting: each ratio component being added in intermediate frequency furnace and carries out melting, makes tapping temperature control at 1500~1600 DEG C, And silicon titanate innoculant and rare earth magnesium ferrosilicon alloy nodulizer are added in the molten iron of melting；
(2) castable: the molten iron disposal pouring of melting is entered in the mold by prefabricated loam core, pours into gear idiosome shape Shape；
(3) blank preheats: gear idiosome being put into gas-fired heater and is heated, heating and temperature control is 330~450 DEG C, soaking time is controlled in 20~30min；
(4) isothermal normalizing: the gear green body of preheating is continued to be heated to 900~950 DEG C, soaking time is controlled in 50~80min； Then to 580~630 DEG C, soaking time is controlled in 90~150min water cooling, is finally air-cooled to room temperature；
(5) tooth embryo, internal diameter, end face and outer diameter turnery processing: are carried out to the gear green body being cooled to room temperature using numerically controlled lathe Turnery processing；
(6) rolling, Gear Shaping: the gear idiosome after turnery processing rolls gear idiosome using gear-hobbing machine and gear shapping machine, Gear Shaping；
(7) after the completion of rolling, Gear Shaping, plunge shaving processing Shaving Process: is carried out to gear idiosome using gear shaving machine；
(8) selective hardening: after the completion of Shaving Process, the teeth portion of gear green body and root are carried out using high-frequency quenching induction furnace high Frequency induction isothermal hardening；900~930 DEG C are heated to teeth portion and root first, soaking time is controlled in 2~5min, is then gone out Furnace temperature is controlled at 910~920 DEG C, is immersed 5~15s in the diesel oil medium of normal temperature state and is disposably quenched；
(9) it is tempered: quenched gear idiosome is put into tempering furnace, at 260~280 DEG C, soaking time is controlled for temperature control In 50~60min, then takes out and carry out being air-cooled to room temperature；
(10) carburizing: the gear idiosome after tempering being put into carburizer, is heated to 930~960 DEG C, is carried out at carburizing to teeth portion After managing 60~90s, then takes out and carry out being air-cooled to room temperature；
(11) the gear internal diameter of the gear idiosome after Carburization Treatment, end face, outer diameter position grinding: are subjected to grinding essence Processing；
(12) anti-corrosion: by the gear idiosome after finishing, carrying out anti-corrosion maintenance using spray epoxy paint, obtain gear at Product.
CN201910712632.3A 2019-08-02 2019-08-02 A kind of rotary kiln super large gear and preparation method thereof Pending CN110284071A (en)

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Application publication date: 20190927