CN106498133A - A kind of isothermal normalizing technique of carburizing steel gear - Google Patents

A kind of isothermal normalizing technique of carburizing steel gear Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
gear
cooled
temperature
carburizing steel
incubated
Prior art date
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
CN201611031405.7A
Other languages
Chinese (zh)
Inventor
华志伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wenzhou Baolu Heavy Industry Co Ltd
Original Assignee
Wenzhou Baolu Heavy Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wenzhou Baolu Heavy Industry Co Ltd filed Critical Wenzhou Baolu Heavy Industry Co Ltd
Priority to CN201611031405.7A priority Critical patent/CN106498133A/en
Publication of CN106498133A publication Critical patent/CN106498133A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/28Normalising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32Heat 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

A kind of isothermal normalizing technique of carburizing steel gear
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.
CN201611031405.7A 2016-11-18 2016-11-18 A kind of isothermal normalizing technique of carburizing steel gear Pending CN106498133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611031405.7A CN106498133A (en) 2016-11-18 2016-11-18 A kind of isothermal normalizing technique of carburizing steel gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611031405.7A CN106498133A (en) 2016-11-18 2016-11-18 A kind of isothermal normalizing technique of carburizing steel gear

Publications (1)

Publication Number Publication Date
CN106498133A true CN106498133A (en) 2017-03-15

Family

ID=58328283

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611031405.7A Pending CN106498133A (en) 2016-11-18 2016-11-18 A kind of isothermal normalizing technique of carburizing steel gear

Country Status (1)

Country Link
CN (1) CN106498133A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100848784B1 (en) * 2007-03-28 2008-07-28 다이모스(주) The high strength alloy steel for transmission gear of automobile and thereof heat treatment
CN101363073A (en) * 2008-09-10 2009-02-11 江苏太平洋精密锻造有限公司 Isothermal normalizing technology of carburized gears steel forging
CN101487077A (en) * 2009-03-04 2009-07-22 江苏金源锻造股份有限公司 Isothermal normalizing method for alloy carburizing steel gear and forging shaft for wind power generator
CN105238911A (en) * 2015-11-16 2016-01-13 南车戚墅堰机车车辆工艺研究所有限公司 Steel grain refining heat treatment method for heavy-load locomotive gear
CN105695685A (en) * 2014-11-28 2016-06-22 重庆伊曼环保设备有限公司 Isothermal normalizing process for alloy carburizing steel gear forging stock
CN106086330A (en) * 2016-06-30 2016-11-09 安庆市振发汽车锻件有限责任公司 16MnCrS5 isothermal normalizing technique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100848784B1 (en) * 2007-03-28 2008-07-28 다이모스(주) The high strength alloy steel for transmission gear of automobile and thereof heat treatment
CN101363073A (en) * 2008-09-10 2009-02-11 江苏太平洋精密锻造有限公司 Isothermal normalizing technology of carburized gears steel forging
CN101487077A (en) * 2009-03-04 2009-07-22 江苏金源锻造股份有限公司 Isothermal normalizing method for alloy carburizing steel gear and forging shaft for wind power generator
CN105695685A (en) * 2014-11-28 2016-06-22 重庆伊曼环保设备有限公司 Isothermal normalizing process for alloy carburizing steel gear forging stock
CN105238911A (en) * 2015-11-16 2016-01-13 南车戚墅堰机车车辆工艺研究所有限公司 Steel grain refining heat treatment method for heavy-load locomotive gear
CN106086330A (en) * 2016-06-30 2016-11-09 安庆市振发汽车锻件有限责任公司 16MnCrS5 isothermal normalizing technique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
季长涛等: "20CrMoH钢汽车渗碳齿轮件等温正火前冷却速度的控制研究", 《金属热处理》 *
张克俭: "等温正火前期快冷用冷却介质的选择", 《机械工人》 *

Cited By (5)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN102899460B (en) Heat treatment method for martensitic stainless steel forging module
CN106498133A (en) A kind of isothermal normalizing technique of carburizing steel gear
CN107828957A (en) A kind of Technology for Heating Processing of the carburizing steel gear forgingses of 18C,rNi,Mo7 6
CN103981451B (en) A kind of hot rolling add-back fire type is without Mo plastic die steel steel plate and manufacture method thereof
CN106282836A (en) Steam turbine is by 2Cr11MoVNbN forging and manufacture method thereof
CN103602798A (en) Method for heat treatment on high-hardness semi-steel roller
CN205347520U (en) Long -pending suspension type heat treatment line of putting
CN107881303A (en) Steel annealing process
CN107245565A (en) The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler
CN110306014B (en) Normalizing and tempering process for motor shaft forge piece
CN103468919B (en) Method for reducing roll marks on surface of steel plate in quenching furnace
CN104313258B (en) A kind of spanner quenching method
CN103849738A (en) Heat treatment process for powder metallurgical high-speed steel
CN108774671B (en) Using S48C as the ring manufacturing process using forged hardening of material
CN103981348B (en) A kind of 16Co14Ni10Cr2Mo steel heavy parts method for controlling heat treatment deformation
CN104928562A (en) Low-chromium white cast iron and stress-removal heat treatment process thereof
CN105483334A (en) Hardening and tempering method of novel anti-corrosion glass die steel large-section forging material
CN103725985A (en) Ultra-high strength steel plate and production method thereof
CN102345002A (en) Quenching method of medium carbon steel
CN107641705A (en) A kind of Technology for Heating Processing of steel rolling ring forging
CN103820608B (en) Heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by 35CrMnSi steel
CN106670745A (en) Machining technology for rolling bearing ring
CN110144531A (en) Cable steel alloy and production technology
CN102776333A (en) Process for manufacturing 20Mn2 steel forgings
CN105603167A (en) Cr12 die steel heat-treating technology

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20170315

RJ01 Rejection of invention patent application after publication