CN105689628B - A kind of forging technology of 34CrNiMo6 steels wind power principal axis - Google Patents

A kind of forging technology of 34CrNiMo6 steels wind power principal axis Download PDF

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CN105689628B
CN105689628B CN201610085364.3A CN201610085364A CN105689628B CN 105689628 B CN105689628 B CN 105689628B CN 201610085364 A CN201610085364 A CN 201610085364A CN 105689628 B CN105689628 B CN 105689628B
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forging
incubated
temperature
34crnimo6
wind power
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CN105689628A (en
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高欣
徐岳强
赵晓忠
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JIANGYIN NANGONG FORGING CO Ltd
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JIANGYIN NANGONG FORGING CO Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/06Making machine elements axles or shafts

Abstract

The invention discloses a kind of forging technology of 34CrNiMo6 steels wind power principal axis, including the three sections of heating of normal temperature steel ingot, one heat forging, the second fire time forging, the 3rd fire time forging, the 4th fire time forging, the 5th fire time forging, the 6th fire time forging, the step such as heat treatment and finishing of having no progeny.The forging technology step of 34CrNiMo6 steel wind power principal axis is simple, by using multiple upsetting pull and die-forging forming, because compression can prevent the destruction that intergranular is contacted, the development for being conducive to instracrystalline slip to deform, main shaft alloy structure crystal grain can effectively be refined, tensile strength, yield strength, impact flexibility, elongation percentage and section shrinkage performance of wind power principal axis etc. is set also to be improved therewith, structure of steel consistency is high, the comprehensive mechanical property of main shaft is strong.

Description

A kind of forging technology of 34CrNiMo6 steels wind power principal axis
Technical field
A kind of technical field of forging of the present invention, and in particular to forging technology of 34CrNiMo6 steels wind power principal axis.
Background technology
By the end of the end of the year in 2012, China's wind-powered electricity generation added up installed capacity and reaches 75,320,000 kw, kept the total installation of generating capacity whole world First.Running of wind generating set undergoes the test of the various extreme climates such as temperature, wind-force, stress throughout the year in natural environment Situation is extremely complex.Due to the maximization of Wind turbines, the structure of parts is increasing, and critical piece sets in Wind turbines Meter and manufacturing issue will be protruded more.Main shaft is important parts in wind power generating set, and volume is big, and quality is big.From the country From the point of view of the operation actual conditions of outer Wind turbines, main shaft fracture is the principal mode of main shaft failure, in order to improve the peace of main shaft Full property and reliability, it is necessary to assure main shaft has reliable intensity, rigidity and enough fatigue lives.Improve innovation ability and system It is to propose specific requirement to whole industry to make technical merit, is also the guarantee of aerogenerator unit safe reliability service.In wind-power electricity generation In unit, main shaft assume responsibility for the various load that impeller is passed over, and deliver torque to step-up gear, by axial thrust, Pneumatic moment of flexure passes to cabin and pylon.The spindle material of Wind turbines should have good comprehensive mechanical performance(Good quenches Permeability, intensity, wearability, toughness), to adapt to the effect of high stress and resistance to shock loads.
A kind of method that utilization 34CrNiMo6 steel produces blower fan main shaft for raw material is disclosed in CN103469092A, bag Include refining, forging(Jumping-up, pulling, die-forging forming), heat treatment and finish.Upsetting pull process in above-mentioned forging process(Upsetting pull Number of times and upsetting pull method)Be not described in detail, upsetting pull number of times is unfavorable for the microcosmic formation microscopic structure of forging material less, crystal grain compared with Greatly, gained forging mechanical performance is poor;It is 750 DEG C that final forging temperature is forged in above-mentioned patent, and plastic deformation is low at this temperature, deformation Drag increase, malleability is poor, and the crackle in coarse grained metal is also easy to produce and extended, and absorption at break energy is less, therefore performance Go out relatively low toughness, yield strength and tensile strength.A kind of heat of large-sized shaft-part is disclosed in CN103451402B Processing method, wherein hardening heat are 830~880 DEG C, and temperature is 500~640 DEG C, hardening heat and temperature value model Enclose wider, and use laser heating, the tendency of the Austenite Grain Growth of gained shaft member is big, and just tissue is relatively thick, is also unfavorable for excellent Change the comprehensive mechanical performance of shaft member.It is therefore desirable to wind power principal axis forging technology of the prior art is improved and optimized.
The content of the invention
It is an object of the invention to overcome defect present in prior art, there is provided a kind of internal flaw is few, steel mechanical property The forging technology of 34CrNiMo6 steel wind power principal axis that can be stable.
To achieve the above object, the technical scheme is that:A kind of forging work of 34CrNiMo6 steels wind power principal axis Skill, it is characterised in that comprise the following steps:
S1:By normal temperature steel ingot Three-section type heating to 1180 ± 10 DEG C of initial forging temperature, insulation;
S2:One heat forging, steel ingot come out of the stove after light compressed steel ingot one week first, two ends acute angle is blunt, and raw footage is H steel Jumping-up after ingot is vertical, it is 1.9~2.1 to stop upset ratio during forging, then according to 0 ° -180 ° -90 ° -180 ° blank rotational order according to It is 2.1H~2.4H that the one direction of minor tick progress single one side drafts 10~14%, which is pulled out to charge length, and forging, which melts down, to be added Heat is to initial forging temperature and is incubated;
S3:Second fire time forging, forging come out of the stove after chamfered edge, continue jumping-up to blank highly be H, repeat S1 jumping-up with pull out Long operation, forging, which melts down, to be heated to initial forging temperature and is incubated;
S4:3rd fire time forging, forging repeats S2 chamfered edge, jumping-up and pulling operation after coming out of the stove, forging is rotated into 45 °, With with identical blank rotational order in S1 successively interval carry out one direction pull out predetermined process all directions axis body, number print Impression determines flange section and axle body section, and forging, which melts down, to be heated to initial forging temperature and be incubated;
S5:4th fire time forging, forging pulls out axle body section to the predetermined full-size of spindle shaft figure after coming out of the stove, forging melts down It is heated to initial forging temperature and is incubated;
S6:5th fire time forging, forging is come out of the stove laggard flange head mould, pressure flange head shaping, is melted down and is heated to 1170 ~1180 DEG C, then insulation is cooled to 1080~1100 DEG C of 2~3h of insulation;
S7:6th fire time forging, to the further pulling of forging axle body section to main shaft axle body end size;
S8:Forging is processed through heat treatment after forging, roughing, Tempering and Quenching, finished product successively, obtains 34CrNiMo6 steel wind Electro spindle.
In order that steel ingot internal temperature is uniform, insulation is conducive to realizing structural transformation at a constant temperature, it is to avoid each position of steel ingot Thermal stress and/or structural transformation stress excessively concentrate, make 34CrNiMo6 steel under initial forging temperature have higher plasticity and friendship The resistance of deformation at bottom, technical scheme preferably is that the Heating Process of Ingots in S1 is that normal temperature steel ingot is rapidly heated to 350 DEG C, In terms of the maximum effective thickness of steel ingot, 0.18~0.22h/100mm is incubated, 550 DEG C are continuously heating to, 0.18~0.22h/ is incubated 100mm, is warming up to 850 DEG C, is incubated 0.36~0.44h/100mm, is finally warming up to 1180 ± 10 DEG C.
The larger temperature difference occurs in surface of steel ingot and center during the steel heating of poor thermal conductivity, cause ectonexine non-homogeneous expansion and Temperature stress is produced, in order to avoid producing excessive temperature stress and centre burst occur, makes the heat conduction of heating rate and steel ingot Property match, technical scheme preferably is, in the temperature range that 350 DEG C to 550 DEG C of steel ingot, heating rate be 95~105 DEG C/h; In the temperature range that 850 DEG C to 1180 ± 10 DEG C of steel ingot, heating rate is 75~80 DEG C/h.
It is preferred that technical scheme be that the technical process of heat treatment after forging is:Forging obtained by S3 is cooled to 550 DEG C, enters stove Insulation 4.5~5.5 hours, 890 ± 10 DEG C are warming up to by technique, and samming is incubated 20~24 hours, come out of the stove it is uniform be cooled to 350 soon ± At 5 DEG C, enter stove and be incubated 4~4.5 hours, be then warming up to 680 ± 5 DEG C by technique, samming is incubated 34~36 hours, furnace cooling During to less than 250 DEG C, forging goes out to be furnace-cooled to normal temperature.
In order to further optimize the comprehensive mechanical performance of shaft member, technical scheme preferably is, the technique mistake of Tempering and Quenching Cheng Wei:Forging is warming up to 400 ± 10 DEG C with the heating rate less than 80 DEG C/h, samming is incubated 3~3.5 hours, then with small 650 ± 10 DEG C are warming up in 80 DEG C/h heating rate, samming is incubated 5~5.5 hours, is then warming up to 860 ± 10 by technique DEG C, samming is incubated 17~19 hours, quenching in first liquid medium, is placed in heat-treatment furnace and is warming up to 300 ± 10 DEG C, samming is protected Temperature 3~3.5 hours, is then warming up to 620 ± 10 DEG C, samming is incubated 28~30 hours, and second liquid medium middling speed is cooled to 200 DEG C Then air cooling.
It is preferred that technical scheme be, before forging is placed in one, the initial temperature of first liquid medium and second liquid medium Degree is no more than 30 DEG C, after forging is placed in one, and the temperature of first liquid medium and second liquid medium is no more than 40 DEG C.
In order to ensure that blank has enough plasticity and can obtain tiny crystal grain after stopping forging, technical scheme preferably is, S2, S3, S4, S5, S6, S7 final forging temperature are not less than 850 DEG C.
In order that each site tissue is uniform in steel ingot or forging, optimize forging effect, technical scheme preferably is, S1, S2, In S3, S4, S5 forging heating after isothermal holding be:In terms of the maximum effective thickness of steel ingot, 0.8~0.9h/100mm is incubated.
The advantages of the present invention are:
The forging technology step of 34CrNiMo6 steel wind power principal axis is simple, by using multiple upsetting pull and die-forging forming, by The destruction that intergranular is contacted can be prevented in compression, the development for being conducive to instracrystalline slip to deform can effectively refine main shaft alloy structure Crystal grain, makes tensile strength, yield strength, impact flexibility, elongation percentage and section shrinkage performance of wind power principal axis etc. also obtain therewith Improve;Multiple upsetting pull can smash the massive carbide in steel alloy, and be uniformly distributed it to improve the use of wind power principal axis Performance;Structure of steel microscopic observation is shown, main shaft made from above-mentioned forging technology forms metal fibrous tissue, and metallic fiber Along the main shaft maximum weighted directional spreding of part, structure of steel consistency is high, and the comprehensive mechanical property of main shaft is strong.
Embodiment
With reference to embodiment, the embodiment to the present invention is further described.Following examples are only used for more Plus technical scheme is clearly demonstrated, and can not be limited the scope of the invention with this.
Embodiment 1
The forging technology of the 34CrNiMo6 steel wind power principal axis of embodiment 1, comprises the following steps:
S1:By normal temperature steel ingot Three-section type heating to 1180 ± 10 DEG C of initial forging temperature, insulation;
S2:One heat forging, steel ingot come out of the stove after light compressed steel ingot one week first, two ends acute angle is blunt, and raw footage is H steel Jumping-up after ingot is vertical, it is 2.1 to stop upset ratio during forging, is then spaced successively according to 0 ° -180 ° -90 ° -180 ° of blank rotational order It is 2.4H that the one direction of progress single one side drafts 14%, which is pulled out to charge length, and forging, which melts down, to be heated to initial forging temperature and protect Temperature;
S3:Second fire time forging, forging come out of the stove after chamfered edge, continue jumping-up to blank highly be H, repeat S1 jumping-up with pull out Long operation, forging, which melts down, to be heated to initial forging temperature and is incubated;
S4:3rd fire time forging, forging repeats S2 chamfered edge, jumping-up and pulling operation after coming out of the stove, forging is rotated into 45 °, With with identical blank rotational order in S1 successively interval carry out one direction pull out predetermined process all directions axis body, number print Impression determines flange section and axle body section, and forging, which melts down, to be heated to initial forging temperature and be incubated;
S5:4th fire time forging, forging pulls out axle body section to the predetermined full-size of spindle shaft figure after coming out of the stove, forging melts down It is heated to initial forging temperature and is incubated;
S6:5th fire time forging, forging is come out of the stove laggard flange head mould, pressure flange head shaping, is melted down and is heated to 1170 ~1180 DEG C, then insulation is cooled to 1080~1100 DEG C of insulation 3h;
S7:6th fire time forging, to the further pulling of forging axle body section to main shaft axle body end size;
S8:Forging is processed through heat treatment after forging, roughing, Tempering and Quenching, finished product successively, obtains 34CrNiMo6 steel wind Electro spindle.
Heating Process of Ingots in S1 is that normal temperature steel ingot is rapidly heated to 350 DEG C, in terms of the maximum effective thickness of steel ingot, 0.22h/100mm is incubated, 450 DEG C are continuously heating to, 0.22h/100mm is incubated, 950 DEG C are warming up to, 0.44h/100mm is incubated, Finally it is warming up to 1180 ± 10 DEG C.
The technical process of heat treatment after forging is:Forging obtained by S3 is cooled to 550 DEG C, enters stove and is incubated 5.5 hours, by technique It is warming up to 890 ± 10 DEG C, samming is incubated 24 hours, comes out of the stove uniform when being cooled to 350 ± 5 DEG C soon, enter stove and be incubated 4.5 hours, then 680 ± 5 DEG C are warming up to by technique, samming is incubated 36 hours, and when cooling to less than 250 DEG C with the furnace, forging goes out to be furnace-cooled to normal temperature.
Tempering and Quenching is using the heat treatment method disclosed in CN103451402 B, and hardening heat is 850 ± 5 DEG C, insulation Time 7h, using oil cooling but, 70 DEG C of oil temperature, oil in cool time be 45 ± 15min;Temperature is 595 ± 5 DEG C, insulation Time 10h, uses water-cooled, 50 DEG C of water temperature, the cool time 10min in water after tempering.
S2, S3, S4, S5, S6, S7 final forging temperature are 840 DEG C.
In S1, S2, S3, S4, S5 forging heating after isothermal holding be:In terms of the maximum effective thickness of steel ingot, 0.7h/ is incubated 100mm。
Embodiment 2
Embodiment 2 is based on embodiment 1, and specifically difference is forging technology:
It is 1.9 to stop upset ratio during forging in S2, and pulling to charge length is 2.1H;
S6:1080~1100 DEG C of insulation 2h are cooled to after 5th fire time forging;
Heating Process of Ingots in S1 is that normal temperature steel ingot is rapidly heated to 350 DEG C, in terms of the maximum effective thickness of steel ingot, 0.18h/100mm is incubated, 550 DEG C are continuously heating to, 0.18h/100mm is incubated, 850 DEG C are warming up to, 0.36h/100mm is incubated, Finally it is warming up to 1180 ± 10 DEG C.
In the temperature range that 350 DEG C to 550 DEG C of steel ingot, heating rate is 95 DEG C/h;850 DEG C to 1180 ± 10 DEG C of steel ingot In temperature range, heating rate is 75 DEG C/h.
The technical process of Tempering and Quenching is:Forging is warming up to 400 ± 10 DEG C with the heating rate less than 80 DEG C/h, Temperature insulation 3 hours, is then warming up to 650 ± 10 DEG C, samming is incubated 5 hours, then by work with the heating rate less than 80 DEG C/h Skill is warming up to 860 ± 10 DEG C, and samming is incubated 17~19 hours, and quenching in first liquid medium is placed in heat-treatment furnace and is warming up to 300 ± 10 DEG C, samming is incubated 3 hours, is then warming up to 620 ± 10 DEG C, samming is incubated 28 hours, quickly cooling in second liquid medium To 200 DEG C and then air cooling.
Before forging is placed in one, the initial temperature of first liquid medium and second liquid medium is 40 DEG C, and forging is placed in After wherein, the temperature control of first liquid medium and second liquid medium is below 50 DEG C.
S2, S3, S4, S5, S6, S7 final forging temperature are 850 DEG C.
In S1, S2, S3, S4, S5 forging heating after isothermal holding be:In terms of the maximum effective thickness of steel ingot, 0.8h/ is incubated 100mm。
Embodiment 3
Embodiment 3 is based on embodiment 2, and difference is:
It is 2 to stop upset ratio during forging in S2, and pulling to charge length is 2.25H;
S6:1080~1100 DEG C of insulation 3h are cooled to after 5th fire time forging;
Heating Process of Ingots in S1 is that normal temperature steel ingot is rapidly heated to 350 DEG C, in terms of the maximum effective thickness of steel ingot, 0.2h/100mm is incubated, 550 DEG C are continuously heating to, 0.12h/100mm is incubated, 850 DEG C are warming up to, 0.4h/100mm is incubated, most After be warming up to 1180 ± 10 DEG C.
In the temperature range that 350 DEG C to 550 DEG C of steel ingot, heating rate is 105 DEG C/h;850 DEG C to 1180 ± 10 DEG C of steel ingot Temperature range in, heating rate be 80 DEG C/h.
Before forging is placed in one, the initial temperature of first liquid medium and second liquid medium is 25 DEG C, and forging is placed in After wherein, the temperature of first liquid medium and second liquid medium is no more than 40 DEG C.
S2, S3, S4, S5, S6, S7 final forging temperature are 890 DEG C.
In S1, S2, S3, S4, S5 forging heating after isothermal holding be:In terms of the maximum effective thickness of steel ingot, 0.9h/ is incubated 100mm。
Comparative example
Comparative example 1 is directly heated to 1180 ± 10 DEG C of temperature range with 60 DEG C/h.
Comparative example 2 saves the fire time forging process of S3 second;
Comparative example 3 saves chamfered edge in the fire time forging process of S3 second and S4, jumping-up and pulling operation;
Other technological parameter be the same as Examples 3 of comparative example 1,2 and 3.
Respectively according to the rules to the tensile strength of main shaft, yield strength, toughness, elongation percentage, the contraction percentage of area, gold Mutually detected.Measured value see the table below:
Final forging temperature is high in embodiment 3, and holding temperature is higher, compared to embodiment 2 and embodiment 1, forging process energy Consumption is higher.
The steel matter of embodiment and comparative example uses the steel ingot with batch, and first liquid medium is that Japan's JEF series is inorganic Macromolecule is combined water-soluble quenching medium, and second liquid medium uses salt solution.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, on the premise of the technology of the present invention principle is not departed from, some improvements and modifications can also be made, these improvements and modifications Also it should be regarded as protection scope of the present invention.

Claims (8)

1. a kind of forging technology of 34CrNiMo6 steels wind power principal axis, it is characterised in that comprise the following steps:
S1:By normal temperature steel ingot Three-section type heating to 1180 ± 10 DEG C of initial forging temperature, insulation;
S2:One heat forging, steel ingot come out of the stove after light compressed steel ingot one week first, two ends acute angle is blunt, and raw footage erects for H steel ingot Jumping-up after straight, it is 1.9~2.1 to stop upset ratio during forging, then according to 0 ° -180 ° -90 ° -180 ° blank rotational order successively between It is 2.1H~2.4H to be pulled out every the one direction for carrying out single one side drafts 10~14% to charge length, and forging, which melts down, to be heated to Initial forging temperature is simultaneously incubated;
S3:Second fire time forging, forging come out of the stove after chamfered edge, continue jumping-up to blank highly be H, repeat S1 jumping-up and pulling behaviour Make, forging, which melts down, to be heated to initial forging temperature and be incubated;
S4:3rd fire time forging, forging repeats S2 chamfered edge, jumping-up and pulling operation after coming out of the stove, forging is rotated into 45 °, with In S1 identical blank rotational order be spaced successively carry out one direction pull out predetermined process all directions axis body, number coining trace Flange section and axle body section are determined, forging, which melts down, to be heated to initial forging temperature and be incubated;
S5:4th fire time forging, forging pulls out axle body section to the predetermined full-size of spindle shaft figure after coming out of the stove, forging melts down heating To initial forging temperature and it is incubated;
S6:5th fire time forging, forging is come out of the stove laggard flange head mould, pressure flange head shaping, melt down be heated to 1170~ 1180 DEG C, then insulation is cooled to 1080~1100 DEG C of 2~3h of insulation;
S7:6th fire time forging, to the further pulling of forging axle body section to main shaft axle body end size;
S8:Forging is processed through heat treatment after forging, roughing, Tempering and Quenching, finished product successively, obtains 34CrNiMo6 steel wind-powered electricity generation masters Axle.
2. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 1, it is characterised in that the steel in S1 Ingot heating process is that normal temperature steel ingot is rapidly heated to 350 DEG C, in terms of the maximum effective thickness of steel ingot, is incubated 0.18~0.22h/ 100mm, is continuously heating to 550 DEG C, is incubated 0.18~0.22h/100mm, is warming up to 850 DEG C, is incubated 0.36~0.44h/ 100mm, is finally warming up to 1180 ± 10 DEG C.
3. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 2, it is characterised in that 350 DEG C of steel ingot To 550 DEG C of temperature ranges, heating rate is 95~105 DEG C/h;In the temperature range that 850 DEG C to 1180 ± 10 DEG C of steel ingot, Heating rate is 75~80 DEG C/h.
4. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 1, it is characterised in that after forging at heat The technical process of reason is:Forging obtained by S3 is cooled to 550 DEG C, enters stove and is incubated 4.5~5.5 hours, 890 are warming up to by technique ± 10 DEG C, samming is incubated 20~24 hours, comes out of the stove uniform when being cooled to 350 ± 5 DEG C soon, enters stove and be incubated 4~4.5 hours, then by work Skill is warming up to 680 ± 5 DEG C, and samming is incubated 34~36 hours, and when cooling to less than 250 DEG C with the furnace, forging goes out to be furnace-cooled to normal temperature.
5. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 1, it is characterised in that at quenched heat The technical process of reason is:Forging is warming up to 400 ± 10 DEG C with the heating rate less than 80 DEG C/h, samming insulation 3~3.5 is small When, 650 ± 10 DEG C then are warming up to the heating rate less than 80 DEG C/h, samming is incubated 5~5.5 hours, then by technique liter Temperature is to 860 ± 10 DEG C, and samming is incubated 17~19 hours, quenching in first liquid medium, be placed in heat-treatment furnace and be warming up to 300 ± 10 DEG C, samming is incubated 3~3.5 hours, 620 ± 10 DEG C is then warming up to, samming is incubated 28~30 hours, in second liquid medium Quickly cooling is to 200 DEG C and then air cooling.
6. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 5, it is characterised in that forging is placed in Before wherein, the initial temperature of first liquid medium and second liquid medium is no more than 30 DEG C, after forging is placed in one, the The temperature of one liquid medium and second liquid medium is no more than 40 DEG C.
7. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 1, it is characterised in that S2, S3, S4, S5, S6, S7 final forging temperature are not less than 850 DEG C.
8. the forging technology of 34CrNiMo6 steels wind power principal axis according to claim 1, it is characterised in that S1, S2, S3, In S4, S5 forging heating after isothermal holding be:In terms of the maximum effective thickness of steel ingot, 0.8~0.9h/100mm is incubated.
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CN106040953B (en) * 2016-08-24 2018-12-25 江苏金源高端装备股份有限公司 A kind of forging technology of large-scale wind electricity main-axis
CN106238661B (en) * 2016-08-26 2018-12-25 江阴振宏重型锻造有限公司 The hollow forging technique of large-scale wind electricity main-axis
CN107470528B (en) * 2017-08-04 2019-02-01 钢铁研究总院 A kind of forging method that nuclear power is refined with the steel heavy forging center position SA508Gr.4N
CN109022729A (en) * 2018-09-11 2018-12-18 武钢集团襄阳重型装备材料有限公司 A kind of high temperature diffusion process for forging
CN110508733B (en) * 2019-03-15 2021-02-12 内蒙古北方重工业集团有限公司 Method for manufacturing high-strength extrusion shaft
CN110527904B (en) * 2019-08-15 2021-03-19 洛阳双瑞特种装备有限公司 Manufacturing method of long-life high-pressure pump head body

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CN102764954B (en) * 2012-06-26 2015-06-10 江苏金源锻造股份有限公司 Forging process for wind generator spindle
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