CN106498133A - A kind of isothermal normalizing technique of carburizing steel gear - Google Patents
A kind of isothermal normalizing technique of carburizing steel gear Download PDFInfo
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- CN106498133A CN106498133A CN201611031405.7A CN201611031405A CN106498133A CN 106498133 A CN106498133 A CN 106498133A CN 201611031405 A CN201611031405 A CN 201611031405A CN 106498133 A CN106498133 A CN 106498133A
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- Prior art keywords
- gear
- cooled
- temperature
- carburizing steel
- incubated
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Classifications
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- 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
- 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
Abstract
The present invention discloses a kind of isothermal normalizing technique of carburizing steel gear, comprises the following steps:A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 915~925 DEG C, be incubated 4.7~5.3h;B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 75~85 DEG C/h;C, when gear temperature is cooled to 675~685 DEG C, be placed on temperature in 660 DEG C of holding furnace, Slow cooling carried out to gear, when gear temperature is cooled to 660 DEG C, be incubated 5.5~6.5h;After d, insulation terminate, gear is taken out, room temperature is air cooled to.A kind of isothermal normalizing technique of carburizing steel gear is by controlling air-cooled speed, and when gear is cooled to 675~685 DEG C, melt down slow cooling to be incubated to after 660 DEG C, and then the formation of pro-eutectoid ferrite can be suppressed, it is obviously improved the steel forgings segregation situation that produces, banded structure is alleviated, mechanical property is improve, service life is extended.
Description
Technical field
A kind of the present invention relates to Field of Heat-treatment, more particularly to isothermal normalizing technique of carburizing steel gear.
Background technology
Carburizing steel be one kind can stand carburizing and quenching improve case hardness and wearability and center portion keep appropriate intensity and
The steel of toughness.Carburizing steel is widely used in the gear manufacture of the industries such as wind-powered electricity generation, reductor, locomotive.Existing carburizing steel gear,
After forging molding, need to carry out normalized treatment, then, after processing using conventional normalizing process, its segregation situation substantially, affects to ooze
The mechanical property and service life of carbon steel gear, thus, is badly in need of solving.
Content of the invention
It is an object of the invention to provide a kind of isothermal normalizing technique of carburizing steel gear, to solve using conventional positive firer
Skill processes carburizing steel gear, and segregation situation substantially, affects the problem of the mechanical property and service life of carburizing steel gear.
The purpose of the present invention is to be achieved through the following technical solutions:
A kind of isothermal normalizing technique of carburizing steel gear, comprises the following steps:
A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 915~925 DEG C, insulation 4.7~
5.3h;
B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 75~85 DEG C/h;
C, when gear temperature is cooled to 675~685 DEG C, be placed on temperature in 660 DEG C of holding furnace, gear entered
Row Slow cooling, when gear temperature is cooled to 660 DEG C, is incubated 5.5~6.5h;
After d, insulation terminate, gear is taken out, room temperature is air cooled to.
As a preferred embodiment of the present invention, the gear using carburizing steel forging molding is put in step a plus
In hot stove, 920 DEG C are heated to, are incubated 5h.
Used as a preferred embodiment of the present invention, in step b, rate of cooling is 80 DEG C/h.
As a preferred embodiment of the present invention, in the step c when gear temperature is cooled to 680 DEG C, it is placed on
Temperature carries out Slow cooling to gear in 660 DEG C of holding furnace, when gear temperature is cooled to 660 DEG C, is incubated 6h.
Beneficial effects of the present invention are:A kind of isothermal normalizing technique of carburizing steel gear passes through to control air-cooled speed,
And when gear is cooled to 675~685 DEG C, melts down slow cooling and be incubated to after 660 DEG C, and then the shape of pro-eutectoid ferrite can be suppressed
Into being obviously improved the steel forgings segregation situation that produces, alleviate banded structure, improve mechanical property, extend use
Life-span.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.It is understood that this place
The embodiment of description is used only for explaining the present invention, rather than limitation of the invention.
Embodiment 1
In the present embodiment, a kind of isothermal normalizing technique of carburizing steel gear is comprised the following steps:
A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 915 DEG C, be incubated 5.3h;
B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 75 DEG C/h;
C, when gear temperature is cooled to 675 DEG C, be placed on temperature in 660 DEG C of holding furnace, gear delayed
Slow cool down, when gear temperature is cooled to 660 DEG C, is incubated 6.5h;
After d, insulation terminate, gear is taken out, room temperature is air cooled to.
Using the gear of above-mentioned technique productions, segregation situation is obviously improved, and alleviates banded structure, and its tensile strength can
13% is improved, elongation percentage can improve 13%, and impact toughness can improve 25%.
Embodiment 2
In the present embodiment, a kind of isothermal normalizing technique of carburizing steel gear is comprised the following steps:
A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 925 DEG C, be incubated 4.7h;
B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 85 DEG C/h;
C, when gear temperature is cooled to 685 DEG C, be placed on temperature in 660 DEG C of holding furnace, gear delayed
Slow cool down, when gear temperature is cooled to 660 DEG C, is incubated 5.5h;
After d, insulation terminate, gear is taken out, room temperature is air cooled to.
Using the gear of above-mentioned technique productions, segregation situation is obviously improved, and alleviates banded structure, and its tensile strength can
15% is improved, elongation percentage can improve 12%, and impact toughness can improve 23%.
Embodiment 3
In the present embodiment, a kind of isothermal normalizing technique of carburizing steel gear is comprised the following steps:
A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 920 DEG C, be incubated 5h;
B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 80 DEG C/h;
C, when gear temperature is cooled to 680 DEG C, be placed on temperature in 660 DEG C of holding furnace, gear delayed
Slow cool down, when gear temperature is cooled to 660 DEG C, is incubated 6h;
After d, insulation terminate, gear is taken out, room temperature is air cooled to.
Using the gear of above-mentioned technique productions, segregation situation is obviously improved, and alleviates banded structure, and its tensile strength can
20% is improved, elongation percentage can improve 15%, and impact toughness can improve 30%.
Above example simply elaborates that the ultimate principle and characteristic of the present invention, the present invention are not limited by above-described embodiment,
Without departing from the spirit and scope of the present invention, the present invention also has various change and change, and these changes and change all fall
Enter in scope of the claimed invention.The claimed scope of the invention is defined by the following claims.
Claims (4)
1. a kind of isothermal normalizing technique of carburizing steel gear, it is characterised in that:Comprise the following steps:
A, the gear using carburizing steel forging molding is put in heating furnace, is heated to 915~925 DEG C, be incubated 4.7~5.3h;
B, insulation terminate after, gear is taken out, carry out air-cooled, rate of cooling be 75~85 DEG C/h;
C, when gear temperature is cooled to 675~685 DEG C, be placed on temperature in 660 DEG C of holding furnace, gear delayed
Slow cool down, when gear temperature is cooled to 660 DEG C, is incubated 5.5~6.5h;
After d, insulation terminate, gear is taken out, room temperature is air cooled to.
2. the isothermal normalizing technique of a kind of carburizing steel gear according to claim 1, it is characterised in that:In step a
Gear using carburizing steel forging molding is put in heating furnace, 920 DEG C are heated to, 5h is incubated.
3. the isothermal normalizing technique of a kind of carburizing steel gear according to claim 1, it is characterised in that:In step b
Rate of cooling is 80 DEG C/h.
4. the isothermal normalizing technique of a kind of carburizing steel gear according to claim 1, it is characterised in that:In step c
When gear temperature is cooled to 680 DEG C, temperature is placed in 660 DEG C of holding furnace, Slow cooling is carried out to gear, tooth is treated
When wheel temperature is cooled to 660 DEG C, 6h is incubated.
Priority Applications (1)
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CN201611031405.7A CN106498133A (en) | 2016-11-18 | 2016-11-18 | A kind of isothermal normalizing technique of carburizing steel gear |
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CN201611031405.7A CN106498133A (en) | 2016-11-18 | 2016-11-18 | A kind of isothermal normalizing technique of carburizing steel gear |
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CN201611031405.7A Pending CN106498133A (en) | 2016-11-18 | 2016-11-18 | A kind of isothermal normalizing technique of carburizing steel gear |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107739807A (en) * | 2017-09-28 | 2018-02-27 | 刘澄 | A kind of continuous heat processing method of accurate control alloy carburizing steel part pretreatment microscopic structure |
CN107828957A (en) * | 2017-09-27 | 2018-03-23 | 无锡宝露重工有限公司 | A kind of Technology for Heating Processing of the carburizing steel gear forgingses of 18C,rNi,Mo7 6 |
CN108396116A (en) * | 2018-05-29 | 2018-08-14 | 河南九环汽车零部件有限公司 | A kind of isothermal normalizing technique of automobile steering device component |
CN108747239A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of Gearmaking Technology |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107828957A (en) * | 2017-09-27 | 2018-03-23 | 无锡宝露重工有限公司 | A kind of Technology for Heating Processing of the carburizing steel gear forgingses of 18C,rNi,Mo7 6 |
CN107739807A (en) * | 2017-09-28 | 2018-02-27 | 刘澄 | A kind of continuous heat processing method of accurate control alloy carburizing steel part pretreatment microscopic structure |
CN107739807B (en) * | 2017-09-28 | 2019-05-14 | 刘澄 | A kind of continuous heat processing method of accurate control alloy carburizing steel part pretreatment microscopic structure |
CN108396116A (en) * | 2018-05-29 | 2018-08-14 | 河南九环汽车零部件有限公司 | A kind of isothermal normalizing technique of automobile steering device component |
CN108747239A (en) * | 2018-08-06 | 2018-11-06 | 合肥银泉铸造有限责任公司 | A kind of Gearmaking Technology |
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