CN105969962A - Control process of gear steel strip-shaped structure - Google Patents
Control process of gear steel strip-shaped structure Download PDFInfo
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- CN105969962A CN105969962A CN201610387104.1A CN201610387104A CN105969962A CN 105969962 A CN105969962 A CN 105969962A CN 201610387104 A CN201610387104 A CN 201610387104A CN 105969962 A CN105969962 A CN 105969962A
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- forging
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- toothed wheel
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention provides a control process of a gear steel strip-shaped structure and belongs to the field of metal material manufacturing. The control process includes the steps that a, blanking is performed, wherein a steel blank is cut off; b, segmented heating is performed, wherein segmented heating is performed on the steel blank, and according to the first-time heating, the furnace charging temperature is lower than 600 DEG C, and preheating is performed for 3.5 h or above; according to the second-time heating, heating is performed at the speed lower than 200 DEG C/h till 850 DEG C is achieved, and the temperature is kept constant for 1 h; and according to the third-time heating, heating is performed at the speed lower than 200 DEG / C h till 1240 DEG C is achieved, and heat preservation is performed for 15 h; c, the first-time of forging is performed, wherein the steel blank is subjected to upsetting, drawing and upsetting, the forging starting temperature is lower than 1220 DEG C, and the final forging temperature is controlled between 850 DEG C and 900 DEG C; d, the second-time of forging is performed, wherein the steel blank is subjected to drawing and sub-material forming, the forging starting temperature is lower than 1220 DEG C, and the final forging temperature is controlled between 850 DEG C and 900 DEG C; and e, cooling after forging is performed, wherein hydrogen diffusion annealing is performed. The control process of the gear steel strip-shaped structure can effectively homogenize components of the steel blank, and the percent of pass when the strip-shaped structure of gear steel is smaller than or equal to the level 2 is increased.
Description
Technical field
The present invention relates to metal material and manufacture field, particularly relate to a kind of toothed wheel steel band structure
Control technique.
Background technology
Gear shaft forging, is the main member of wind power generation gear case, and technology requires higher.
Wherein conventional gear shaft forging material is 18CrNiMo7-6, and it requires banded structure≤2 grade.
18CrNiMo7-6 is Germany's trade mark, and the former trade mark is 17CrNiMo6, along with decelerator machinery row
Industry and wind-powered electricity generation industry, the fast development of high ferro industry, 18CrNiMo7-6 is as gear or gear
The leading application material of axle key component, for guaranteeing that the high efficiency of its product, safety run, uses
Family constantly proposes new requirement to quality of materials technical specification, for reducing large gear deformation, forging
Part hardenability band is reduced into 5HRC by original 7HRC, and proposes the requirement of banded structure.
Generally, the raw material smelting process of 18CrNiMo7-6 gear shaft forging is electric arc furnace (EF)
+ external refining (LF)+vacuum outgas (VD), its material segregation ratio is more serious, according to tradition
Forging Technology when carrying out heat treatment, after forging annealing, press GB/T13299-1991 check,
Banded structure reaches 3 grades, exceedes the requirement of banded structure≤2 grade, often occurs that batch does not conforms to
Lattice and scrap.
Summary of the invention
It is an object of the present invention to provide the control technique of a kind of toothed wheel steel band structure, it is possible to
Effectively the composition of steel billet is carried out homogenization, improve the qualification rate of its banded structure≤2 grade.
Especially, the invention provides the control technique of a kind of toothed wheel steel band structure, including with
Lower step:
A, blanking, intercept steel billet；
B, zone heating, carry out zone heating by described steel billet, for the first time heating: shove charge stove
Temperature, less than 600 DEG C, preheats more than 3.5 hours；Second time heating: with less than 200 DEG C/h's
Speed is heated to 850 DEG C, isothermal 1 hour；Third time heating: with the speed less than 200 DEG C/h
Degree is heated to 1240 DEG C, is incubated 15 hours；
C, for the first time forging, carry out jumping-up, pulling, jumping-up by described steel billet, open forging temperature
Less than 1220 DEG C, final forging temperature controls at 850～900 DEG C；
D, second time forging, carry out described steel billet pulling out, sub-material molding, opens forging temperature low
In 1220 DEG C, final forging temperature controls at 850～900 DEG C；
E, cooling after forged, use first air cooling, and then the method for sand cooling carries out expanding hydrogen annealing.
Further, described step a is selected 18CrNiMo7-6 steel.
Further, the weight of described intercepting steel billet is true according to the weight needed for forging and fire consumption
Fixed.
Further, described step b carries out zone heating and selects gas furnace.
Further, expanding hydrogen annealing in described step e is to prevent from forging in steel part tissue occurring in vain
The annealing process putting class hydrogen embrittlement and carry out.
The control technique of a kind of toothed wheel steel band structure that the present invention provides, by zone heating,
After forging for the first time, second time forging, the processing step of cooling after forged carry out heat treatment, in forging
Make and be incubated 15 hours when being heated to 1240 DEG C, homogenize the composition segregation of material, it is to avoid
In forging process formed banded structure, forging quality meets the requirements, improve its banded structure≤
The qualification rate of 2 grades.
Accompanying drawing explanation
Describe the present invention's the most by way of example, and not by way of limitation in detail
Some specific embodiments.Reference identical in accompanying drawing denote same or similar parts or
Part.It should be appreciated by those skilled in the art that what these accompanying drawings were not necessarily drawn to scale.Attached
In figure:
Fig. 1 is the control work of a kind of toothed wheel steel band structure
The schematic flow sheet of skill；
Fig. 2 is the control work of a kind of toothed wheel steel band structure
The micro-organization chart of the banded structure that skill is formed.
Detailed description of the invention
Fig. 1 is the control work of a kind of toothed wheel steel band structure
The schematic flow sheet of skill.As it is shown in figure 1, the invention provides a kind of toothed wheel steel band structure
Control technique, comprise the following steps:
A, blanking, intercept steel billet；
B, zone heating, carry out zone heating by described steel billet, for the first time heating: shove charge stove
Temperature, less than 600 DEG C, preheats more than 3.5 hours；Second time heating: with less than 200 DEG C/h's
Speed is heated to 850 DEG C, isothermal 1 hour；Third time heating: with the speed less than 200 DEG C/h
Degree is heated to 1240 DEG C, is incubated 15 hours；
C, for the first time forging, carry out jumping-up, pulling, jumping-up by described steel billet, open forging temperature
Less than 1220 DEG C, final forging temperature controls at 850～900 DEG C；
D, second time forging, carry out described steel billet pulling out, sub-material molding, opens forging temperature low
In 1220 DEG C, final forging temperature controls at 850～900 DEG C；
E, cooling after forged, use first air cooling, and then the method for sand cooling carries out expanding hydrogen annealing.
Specifically, step a is selected 18CrNiMo7-6 steel.Cut described in step a
The weight taking steel billet determines according to the weight needed for forging and fire consumption, according to the model of gear shaft not
With, cutting stock weight is performed by Forging Technology.In described step b, carry out zone heating can make
The heating furnace commonly used with those skilled in the art carries out heating and thermal insulation process, preferably selects natural
Steam stove carries out heating and thermal insulation process.In step c and step d, forging process is divided into two fire, the
One fire jumping-up, pulling, jumping-up；Second fire pulling, sub-material molding, initial forging temperature is less than 1220 DEG C,
Final forging temperature controls at 850～900 DEG C.Expanding hydrogen annealing in step e is to prevent from forging steel part
Annealing process white point class hydrogen embrittlement occurring and carry out in tissue.During the technique that expansion hydrogen annealing is conventional has
Temperature annealing and two kinds of methods of vacuum annealing, in the control technique of the toothed wheel steel band structure of the present invention
In, the expansion hydrogen annealing method that those skilled in the art commonly use can be used, can reach to prevent
There is white point class hydrogen embrittlement in forging steel part tissue, does not do too much repeating at this.
For 18CrNiMo7-6 steel, the difficult point processing annealing process is i.e. to ensure to obtain
F+P (F is ferrite, and P is pearlite), the most also must assure that have dehydrogenation function；
The difficult point of Design of Chemical Composition is grain size to be ensured and grain size durability, the most also wants
Must assure that narrow hardenability band, and grain size and grain size durability additionally depend on final forging temperature
Control.
The control technique of the toothed wheel steel band structure of the present invention, by zone heating, for the first time forging
Make, second time forging, after the processing step of cooling after forged carries out heat treatment, arrive in Forge Heating
It is incubated 15 hours when 1240 DEG C, homogenizes the composition segregation of material, it is to avoid forging
Forming banded structure in journey, forging quality meets the requirements, and improves the conjunction of its banded structure≤2 grade
Lattice rate.
In a specific embodiment, it is forged to 18CrNiMo7-6 wind power gear axle
Example, including following operation:
(1) raw material selection 18CrNiMo7-6 steel ingot cogging material, cogging forging ratio is more than 3,
Forge weight and fire consumption are pressed in sawing machine blanking, and the model according to gear shaft is different, and cutting stock weight is by forging
Make technique to perform；
(2) 18CrNiMo7-6 steel billet heats at gas furnace, uses zone heating,
Heating for the first time: shove charge furnace temperature is less than 600 DEG C, preheats more than 3.5 hours；Second time heating:
It is heated to 850 DEG C, isothermal 1 hour with the speed less than 200 DEG C/h；Third time heating: with
Speed less than 200 DEG C/h is heated to 1240 DEG C, forges after being incubated 15 hours；
(3) forging process divides two fire, the first fire jumping-up, pulling, jumping-up；Second fire pulling,
Sub-material molding, initial forging temperature is less than 1220 DEG C, and final forging temperature controls at 850～900 DEG C；
(4) cooling after forged uses first air cooling, and then the method for sand cooling carries out expanding hydrogen annealing.
Fig. 2 is the control work of a kind of toothed wheel steel band structure
The micro-organization chart of the banded structure that skill is formed.Enter as in figure 2 it is shown, be through above operation
After the Forging Technology that its banded structure of row improves, the 18CrNiMo7-6 wind power gear axle obtained
The micro-organization chart that banded structure 100 times amplifies.As can be seen from Figure 2 according to
GB/T13299-1991 checks, and its banded structure reaches 1 grade standard, meets banded structure≤2
The requirement of level.
The control technique of the toothed wheel steel band structure of the present invention, by zone heating, for the first time forging
Make, second time forging, after the processing step of cooling after forged carries out heat treatment, arrive in Forge Heating
It is incubated 15 hours when 1240 DEG C, homogenizes the composition segregation of material, it is to avoid forging
Forming banded structure in journey, forging quality meets the requirements, and improves the conjunction of its banded structure≤2 grade
Lattice rate.
So far, although those skilled in the art will appreciate that the most detailed illustrate and describing
The exemplary embodiment of the present invention, but, without departing from the spirit and scope of the present invention,
Still can directly determine according to present disclosure or derive and meet being permitted of the principle of the invention
Other variations or modifications many.Therefore, the scope of the present invention is it is understood that and regard as covering institute
There are these other variations or modifications.
Claims (5)
1. the control technique of a toothed wheel steel band structure, it is characterised in that comprise the following steps:
A, blanking, intercept steel billet；
B, zone heating, carry out zone heating by described steel billet, for the first time heating: shove charge stove
Temperature, less than 600 DEG C, preheats more than 3.5 hours；Second time heating: with less than 200 DEG C/h's
Speed is heated to 850 DEG C, isothermal 1 hour；Third time heating: with the speed less than 200 DEG C/h
Degree is heated to 1240 DEG C, is incubated 15 hours；
C, for the first time forging, carry out jumping-up, pulling, jumping-up by described steel billet, open forging temperature
Less than 1220 DEG C, final forging temperature controls at 850～900 DEG C；
D, second time forging, carry out described steel billet pulling out, sub-material molding, opens forging temperature low
In 1220 DEG C, final forging temperature controls at 850～900 DEG C；
E, cooling after forged, use first air cooling, and then the method for sand cooling carries out expanding hydrogen annealing.
The control technique of toothed wheel steel band structure the most according to claim 1, its feature
It is, described step a is selected 18CrNiMo7-6 steel.
The control technique of toothed wheel steel band structure the most according to claim 1 and 2, its
Being characterised by, the weight of described intercepting steel billet determines according to the weight needed for forging and fire consumption.
The control technique of toothed wheel steel band structure the most according to claim 1, its feature
It is, described step b carries out zone heating and selects gas furnace.
5. according to the control work of the toothed wheel steel band structure according to any one of claim 1-4
Skill, it is characterised in that expanding hydrogen annealing in described step e is to prevent from forging in steel part tissue occurring
White point class hydrogen embrittlement and the annealing process that carries out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610387104.1A CN105969962A (en) | 2016-06-02 | 2016-06-02 | Control process of gear steel strip-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610387104.1A CN105969962A (en) | 2016-06-02 | 2016-06-02 | Control process of gear steel strip-shaped structure |
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| CN105969962A true CN105969962A (en) | 2016-09-28 |
Family
ID=57010349
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610387104.1A Pending CN105969962A (en) | 2016-06-02 | 2016-06-02 | Control process of gear steel strip-shaped structure |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
| CN109681518A (en) * | 2018-12-31 | 2019-04-26 | 江苏隆盛钻采机械制造有限公司 | A kind of gear shaft product forging and its processing technology |
| CN110227778A (en) * | 2019-07-09 | 2019-09-13 | 中国航发哈尔滨东安发动机有限公司 | A kind of novel high-strength pinion steel forging method |
| CN110453053A (en) * | 2019-08-30 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of control method of toothed wheel steel band structure |
| CN111154961A (en) * | 2019-12-31 | 2020-05-15 | 无锡宝露重工有限公司 | Method for manufacturing shaft forging and shaft forging manufactured by same |
| CN112301337A (en) * | 2020-10-24 | 2021-02-02 | 安徽省含山县皖中减速机械有限公司 | Production process for prolonging service life of speed reducer gear |
| CN113211022A (en) * | 2021-06-15 | 2021-08-06 | 无锡宝露重工有限公司 | Production method for refining grain size of 18CrNiMo7-6 gear |
| CN113684354A (en) * | 2021-08-26 | 2021-11-23 | 重庆长征重工有限责任公司 | Method for improving banded structure of alloy structural steel 17CrNiMo6 forge piece |
| CN114029435A (en) * | 2021-11-01 | 2022-02-11 | 内蒙古北方重工业集团有限公司 | Process method for eliminating steel strip-shaped structure of 40CrNiMoA crankshaft |
| CN114293102A (en) * | 2021-12-31 | 2022-04-08 | 江阴振宏重型锻造有限公司 | Manufacturing method of 17CrNiMo6 forge piece |
| CN114807546A (en) * | 2022-05-16 | 2022-07-29 | 山西太钢不锈钢股份有限公司 | Cr-Ni-Mo high-iron gear steel and heat treatment method for eliminating band segregation thereof |
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| CN101381803A (en) * | 2008-10-13 | 2009-03-11 | 首钢总公司 | Control method of toothed wheel steel band structure |
| CN102424934A (en) * | 2011-11-16 | 2012-04-25 | 东北特殊钢集团有限责任公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
| CN109681518A (en) * | 2018-12-31 | 2019-04-26 | 江苏隆盛钻采机械制造有限公司 | A kind of gear shaft product forging and its processing technology |
| CN110227778B (en) * | 2019-07-09 | 2021-11-09 | 中国航发哈尔滨东安发动机有限公司 | High-strength gear steel forging method |
| CN110227778A (en) * | 2019-07-09 | 2019-09-13 | 中国航发哈尔滨东安发动机有限公司 | A kind of novel high-strength pinion steel forging method |
| CN110453053A (en) * | 2019-08-30 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of control method of toothed wheel steel band structure |
| CN111154961A (en) * | 2019-12-31 | 2020-05-15 | 无锡宝露重工有限公司 | Method for manufacturing shaft forging and shaft forging manufactured by same |
| CN112301337A (en) * | 2020-10-24 | 2021-02-02 | 安徽省含山县皖中减速机械有限公司 | Production process for prolonging service life of speed reducer gear |
| CN113211022A (en) * | 2021-06-15 | 2021-08-06 | 无锡宝露重工有限公司 | Production method for refining grain size of 18CrNiMo7-6 gear |
| CN113684354A (en) * | 2021-08-26 | 2021-11-23 | 重庆长征重工有限责任公司 | Method for improving banded structure of alloy structural steel 17CrNiMo6 forge piece |
| CN114029435A (en) * | 2021-11-01 | 2022-02-11 | 内蒙古北方重工业集团有限公司 | Process method for eliminating steel strip-shaped structure of 40CrNiMoA crankshaft |
| CN114029435B (en) * | 2021-11-01 | 2024-08-13 | 内蒙古北方重工业集团有限公司 | Technological method for eliminating 40CrNiMoA crankshaft steel strip structure |
| CN114293102A (en) * | 2021-12-31 | 2022-04-08 | 江阴振宏重型锻造有限公司 | Manufacturing method of 17CrNiMo6 forge piece |
| CN114293102B (en) * | 2021-12-31 | 2022-07-29 | 振宏重工(江苏)股份有限公司 | Manufacturing method of 17CrNiMo6 forge piece |
| CN114807546A (en) * | 2022-05-16 | 2022-07-29 | 山西太钢不锈钢股份有限公司 | Cr-Ni-Mo high-iron gear steel and heat treatment method for eliminating band segregation thereof |
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Application publication date: 20160928 |