CN106424524B - A kind of forging method of 17CrNiMo6 steel wind-power electricity generation gear - Google Patents
A kind of forging method of 17CrNiMo6 steel wind-power electricity generation gear Download PDFInfo
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- CN106424524B CN106424524B CN201610895798.XA CN201610895798A CN106424524B CN 106424524 B CN106424524 B CN 106424524B CN 201610895798 A CN201610895798 A CN 201610895798A CN 106424524 B CN106424524 B CN 106424524B
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- forging
- electricity generation
- power electricity
- blank
- molding
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
Abstract
A kind of forging method of 17CrNiMo6 steel wind-power electricity generation gear, belongs to wind-power electricity generation Gear Manufacturing Technology, it is characterised in that forging pre-treatment：After heating furnace heating, forging blank is placed in heating furnace and heats and keeps the temperature；Forging molding：Forging temperature is 1240 ± 10 DEG C ~ 830 ± 10 DEG C, and Dan Huoci single pass forging ratios are 1.5 ~ 2, and last a time forging ratio is 1.8 ~ 2, and total forging ratio is more than 4, with 0.1 ~ 1s‑1Rate of deformation makes the poly- material molding of blank；Cooling after forged：It is cooled to 650 ± 10 DEG C of isothermal temperings after Gears with Forging soon, room temperature is cooled to the furnace after heat preservation.Forging is heated before present invention forging, the more disperse of forging interior tissue is uniform；Pass through controlled forge process molding technique parameter so that forging interior tissue easily forms the shaft-like crystal grain such as tiny, improves the comprehensive mechanical property of forging；While cooling after forged mode reduces energy consumption, forging interior tissue stress is eliminated.
Description
Technical field
The invention belongs to wind-power electricity generation Gear Manufacturing Technology field, more particularly to a kind of 17CrNiMo6 steel wind-power electricity generation tooth
The forging method of wheel.
Background technology
The development of human society is largely to consume the extremely precious non-renewable fossil formed before 1 years on the earth
Resource is cost, so in energy field, seeking green clean energy resource becomes only way.Wind energy is inexhaustible, not with it
It exhausts, and wind-power electricity generation is pollution-free, advantageous advantage makes it rapidly become the focus of clean energy resource research and development, wind-power electricity generation row
Industry is risen like the mushrooms after rain.Wind power industry is premised on wind-power electricity generation equipment manufacture, since wind power plant is normal
The unfrequented places such as gobi, desert even sea are operated in, the effect of day and night temperature and alternating wind are undergo, to wind-force
Generate electricity gear, gear shaft equipment comprehensive mechanical property more stringent requirements are proposed.
Domestic heavy-load gear steel substantially continues to use former Soviet Union's trade mark, in the period of the past is very long in, be always 20CrMnTi
The situation of dominance, not only single varieties, and also steel product ingredient fluctuation is big, and hardenability band, field trash is more, causes gear thermal
Processing deformation is big, the service life is low.As that is researched and developed to heavy-duty gear further gos deep into, the production domesticization of various pinion steels makes the tooth in China
Wheel molten steel is flat to step on a new stage.Currently, the SAE86 series of the Cr-Mn systems steel of Germany, the Cr-Mo systems steel of Japan and the U.S.
Steel has been achieved with production domesticization, substantially meets the demand of domestic heavy-load gear steel, however is wherein optimal with 17CrNiMo6 steel
Selection because 17CrNiMo6 steel has many advantages, such as high intensity, high tenacity and high-hardenability.
17CrNiMo6 steel, which is mainly used in, to be transmitted larger power and bears the gear compared with big load, be widely used in mine,
The industrial circles such as transport, locomotive traction, lifting and wind-power electricity generation.Under normal conditions, it is subjected to be close to or up to that material is allowable to answer
The working stress of force value should also have high it is therefore desirable to which material will not only have high bending fatigue strength and contact fatigue strength
Anti-overload ability, to forging technology, more stringent requirements are proposed.However this steel is not yet included in national standard, although having been widely used,
Many basic performances, especially forging technology are often analogous to common heavy-duty gear and are processed by rule of thumb.Due to forging
Technological parameter is formulated unreasonable so that wind-power electricity generation gear comprehensive mechanical property declines, to significantly reduce wind-power electricity generation tooth
The service life of wheel.
Invention content
In order to formulate rational smithing technological parameter, improve after hot-forging forming inside wind-power electricity generation gear 17CrNiMo6 steel
Institutional framework improves wind-power electricity generation gear comprehensive mechanical property, ensures that the service life of wind-power electricity generation gear, the present invention provide one
The forging method of kind wind-power electricity generation gear 17CrNiMo6 steel.
The present invention is achieved by the following technical programs.
A kind of 17CrNiMo6 steel wind-power electricity generation gear forging method, it is characterised in that carried out successively using following steps：
（1）, forging pre-treatment：After heating furnace is warming up to 1230 ~ 1250 DEG C, forging blank is placed in heating furnace and is heated, root
4 ~ 10h is kept the temperature according to blank dimension size；
（2）, forging molding：
Blank after heating is put into the forging molding mold being made of cavity plate, punch-pin, cover die and ejecting mechanism, is forged
Temperature is 1240 ± 10 DEG C ~ 830 ± 10 DEG C, and punch-pin presses with cavity plate, and wherein Dan Huoci single pass forging ratio is 1.5 ~ 2, last
Passage forging ratio is 1.8 ~ 2, and total forging ratio is more than 4, with 0.1 ~ 1s-1Rate of deformation makes blank along the poly- material molding of cover die inner wall；Pressurize 5 ~
After 10s, punch-pin unloads backhaul, the gear after blank demoulding after ejecting mechanism ejects forging molding with cavity plate；
（3）, cooling after forged：It is cooled to 650 ± 10 DEG C of 3 ~ 5h of isothermal tempering after Gears with Forging soon, room is cooled to the furnace after heat preservation
Temperature.
Internal grain degree grade is 5 ~ 7 grades after the forging is forged.
The present invention has the advantages that compared with prior art.
1, forging is carried out before present invention forging reheating austenitizing processing so that the crystal grain inside forging is filled
Divide and grow up, after making the forged molding of forging, the more disperse of forging interior tissue is uniform.
2, forging molding process parameter provided by the invention, says so that forging is not easy in forging process from macroscopic perspective
Cracking；It is said from microcosmic angle so that spherical austenite is easily formed, to inhibit the formation of needle austenite nucleus so that
Forging interior tissue easily forms the shaft-like crystal grain such as tiny, improves the comprehensive mechanical property of forging.
3, cooling after forged mode provided by the invention, instead of 930 DEG C of normalizings+650 after in the prior art cooling down forging
DEG C tempering heat treatment process, reduce energy consumption while, eliminate forging interior tissue stress.
Description of the drawings
Fig. 1 is forging technology curve graph of the present invention.
Fig. 2 is that embodiment one forges the forging interior tissue shape appearance figure obtained after pre-treatment.
Fig. 3 is one forging molding of embodiment in the process with rate of deformation for 0.1s-1, initial forging temperature be 1230 DEG C forging when forge
Part interior tissue shape appearance figure.
Fig. 4 is one forging molding of embodiment in the process with rate of deformation for 0.1s-1, final forging temperature be 820 DEG C forging when forge
Part interior tissue shape appearance figure.
Fig. 5 be one cooling after forged of embodiment during, with forging interior tissue shape appearance figure after 640 DEG C of isothermal tempering 3h.
Specific implementation mode
Embodiment one
In the present embodiment, forging is 2m × Φ 1m cylinder 17CrNiMo6 steel ingots, and 17CrNiMo6 steel ingots are by Taiyuan heavy type
Machinery Co., Ltd. provides, which is low carbon high alloy stainless steel, while having good mechanical property, has stronger resistance to
Etching characteristic is to prepare the excellent raw material of wind-power electricity generation gear, but not with common low carbon high-alloy stainless steel forging process
Together, easily portion generates featheriness or netted bainite within the organization in forging process, reduces the resultant force of wind-power electricity generation gear
Learn performance.
As shown in Fig. 1 ~ 5, a kind of 17CrNiMo6 steel wind-power electricity generation gear forging method, it is characterised in that using following step
Suddenly it carries out successively：
（1）, forging pre-treatment：Forging blank is placed in heating furnace, heating furnace is warming up to 1230 DEG C of blanks and is put into heating furnace
In, 4h is kept the temperature according to blank dimension size, forging interior tissue shape appearance figure as shown in Figure 2 is obtained, claims the crystal grain under the state
Grain size number for original grain, original grain is 2 grades；
（2）, forging molding：
Blank after heating is put into the forging molding mold being made of cavity plate, punch-pin, cover die and ejecting mechanism, forging of beginning
Temperature is 1230 DEG C, and final forging temperature is 820 DEG C, and punch-pin presses with cavity plate, and Dan Huoci single pass forging ratios are 1.5, last a time
It is 1.8, total forging ratio is 4.1, with 0.1s-1Rate of deformation make blank along the poly- material molding of cover die inner wall；After pressurize 5s, punch-pin with it is recessed
Mould unloads backhaul, the gear after blank demoulding after ejecting mechanism ejects forging molding.It is 0.1s if Fig. 3 is rate of deformation-1Plus
Forging interior tissue shape appearance figure when hot temperature is 1230 DEG C, original grain is suitable with recrystallization crystal particle dimension in figure, is obtained for
Adequately grow up.It is 0.1s if Fig. 4 is rate of deformation-1, heating temperature be 820 DEG C when forging interior tissue shape appearance figure.
（3）, cooling after forged：It is cooled to 640 DEG C of isothermal tempering 3h after forging soon, if Fig. 5 is 640 DEG C of isothermal temperings of forging
3h forging interior tissue shape appearance figures, cool to room temperature with the furnace after heat preservation, obtain the forged rear internal grain degree grade of forging after testing
It is 5 grades, meets engineering requirement.
Embodiment two
A kind of wind-power electricity generation gear 17CrNiMo6 steel forging methods, it is characterised in that carried out successively using following steps：
（1）, forging pre-treatment：Forging blank is placed in heating furnace, heating furnace is warming up to 1240 DEG C of blanks and is put into heating furnace
In, 6.5h is kept the temperature according to blank dimension size；
（2）, forging molding：
Blank after heating is put into the forging molding mold being made of cavity plate, punch-pin, cover die and ejecting mechanism, forging of beginning
Temperature is 1240 DEG C, and final forging temperature is 830 DEG C, and punch-pin presses with cavity plate, and Dan Huoci single pass forging ratios are 1.73, last a time
Forging ratio is 1.87, with 0.5s-1Rate of deformation makes blank along the poly- material molding of cover die inner wall；After pressurize 7s, punch-pin unloads back with cavity plate
Journey, the gear after blank demoulding after ejecting mechanism ejects forging molding；
（3）, cooling after forged：It is cooled to 650 DEG C of isothermal tempering 3.5h after forging soon, room temperature is cooled to the furnace after heat preservation.
Internal grain degree grade is 6 grades after the forging is forged, meets engineering requirement.
Embodiment three
A kind of wind-power electricity generation gear 17CrNiMo6 steel forging methods, it is characterised in that carried out successively using following steps：
（1）, forging pre-treatment：Forging blank is placed in heating furnace, heating furnace is warming up to 1250 DEG C of blanks and is put into heating furnace
In, 10h is kept the temperature according to blank dimension size；
（2）, forging molding：
Blank after heating is put into the forging molding mold being made of cavity plate, punch-pin, cover die and ejecting mechanism, forging of beginning
Temperature is 1250 DEG C, and final forging temperature is 840 DEG C, and punch-pin presses with cavity plate, and Dan Huoci single pass forging ratios are 2, and last a time is
Forging ratio 2, with 1s-1Rate of deformation makes blank along the poly- material molding of cover die inner wall；After pressurize 10s, punch-pin unloads backhaul, blank with cavity plate
Gear after demoulding after ejecting mechanism ejects forging molding；
（3）, cooling after forged：It is cooled to 660 DEG C of isothermal tempering 5h after forging soon, room temperature is cooled to the furnace after heat preservation.
Internal grain degree grade is 7 grades after the forging is forged, meets engineering requirement.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
It is familiar with those skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in should all be contained
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (2)
1. a kind of 17CrNiMo6 steel wind-power electricity generation gear forging method, which is characterized in that carried out successively using following steps：
（1）, forging pre-treatment：After heating furnace is warming up to 1230 ~ 1250 DEG C, forging blank is placed in heating furnace and is heated, according to hair
Base size keeps the temperature 4 ~ 10h；
（2）, forging molding：
Blank after heating is put into gear forming mold, forging temperature is 1240 ± 10 DEG C ~ 830 ± 10 DEG C, and Dan Huoci is mono-
Passage forging ratio is 1.5 ~ 2, and last a time forging ratio is 1.8 ~ 2, and total forging ratio is more than 4, with 0.1 ~ 1s-1Rate of deformation makes the poly- material of blank
Molding；After 5 ~ 10s of pressurize；
（3）, cooling after forged：It is cooled to 650 ± 10 DEG C of 3 ~ 5h of isothermal tempering after Gears with Forging soon, room temperature is cooled to the furnace after heat preservation.
2. a kind of 17CrNiMo6 steel wind-power electricity generation gear forging method according to claim 1, it is characterised in that：Forging
17CrNiMo6 steel wind-power electricity generation gear internal grain size number after molding is 5 ~ 7 grades.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610895798.XA CN106424524B (en) | 2016-10-14 | 2016-10-14 | A kind of forging method of 17CrNiMo6 steel wind-power electricity generation gear |
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| CN201610895798.XA CN106424524B (en) | 2016-10-14 | 2016-10-14 | A kind of forging method of 17CrNiMo6 steel wind-power electricity generation gear |
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| CN106424524A CN106424524A (en) | 2017-02-22 |
| CN106424524B true CN106424524B (en) | 2018-10-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN111636033A (en) * | 2020-06-23 | 2020-09-08 | 张家港海锅新能源装备股份有限公司 | Production method of 18CrNiMo7-6 forging for wind power equipment gear |
| CN112620560A (en) * | 2020-12-02 | 2021-04-09 | 南京迪威尔高端制造股份有限公司 | 18CrNiMo7-6 gear forging and manufacturing method and detection method for overcoming subcutaneous defects of forging |
| 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 |
| CN114210894A (en) * | 2021-12-27 | 2022-03-22 | 内蒙古北方重工业集团有限公司 | Forging temperature control method for 35CrNi3Mo die cast ingot precision forging machine |
| 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 |
| CN115044835B (en) * | 2022-07-29 | 2023-04-21 | 张家港海锅新能源装备股份有限公司 | Alloy steel for gear box forging and manufacturing method and application of forging of alloy steel |
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| CN1727502A (en) * | 2004-07-29 | 2006-02-01 | 山东泰山钢铁有限公司 | Method for forging Crl2MoV steel |
| DE102011075697A1 (en) * | 2011-05-12 | 2012-11-15 | Robert Bosch Gmbh | Chromium-molybdenum alloy |
| CN102424934B (en) * | 2011-11-16 | 2013-06-05 | 抚顺特殊钢股份有限公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
| CN102699637B (en) * | 2012-06-26 | 2015-06-10 | 江苏金源锻造股份有限公司 | Process for forging main shaft flange of wind driven generator |
| CN103952646B (en) * | 2014-05-05 | 2016-08-24 | 莱芜钢铁集团有限公司 | A kind of low temperature resistant low-alloy structural steel and manufacture method thereof |
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