CN111468668B - Wind power main shaft forging process - Google Patents
Wind power main shaft forging process Download PDFInfo
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- CN111468668B CN111468668B CN202010391100.7A CN202010391100A CN111468668B CN 111468668 B CN111468668 B CN 111468668B CN 202010391100 A CN202010391100 A CN 202010391100A CN 111468668 B CN111468668 B CN 111468668B
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- core rod
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- heating
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- 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
- B21K1/06—Making machine elements axles or shafts
- B21K1/10—Making machine elements axles or shafts of cylindrical form
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- 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
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- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
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- 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
- B21K1/06—Making machine elements axles or shafts
- B21K1/063—Making machine elements axles or shafts hollow
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
Abstract
The invention discloses a wind power main shaft forging process, and particularly relates to the technical field of wind power main shaft forging, wherein the forging process comprises the following steps: s1, preprocessing raw materials; s2, heating; s3, preparing a blank; s4, upsetting; s5, drawing out; s6, upsetting the flange end; s7, drawing out the core rod; s8, heat treatment; and S9, detecting. According to the invention, the core rod is heated before being drawn out, so that the temperature rise amount of the core rod after entering the forging is reduced, the thermal expansion amount of the core rod is effectively reduced, the core rod is cooled after being drawn out, the cooling volume of the core rod is effectively reduced, the core rod is effectively prevented from being tightly adhered to and locked with the hole wall of the forging, the friction force between the core rod and the forging is reduced, the core rod is convenient to withdraw, and the machining efficiency is further ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of wind power main shaft forging, in particular to a wind power main shaft forging process.
Background
Wind power generation is characterized in that kinetic energy of wind is converted into electric energy, wind energy is regarded as a clean renewable energy source, attention is paid to all countries in the world more and more, the intrinsic quantity of the wind power generation is huge, a wind power main shaft is a core part in a wind power generator set, and the quality of the wind power main shaft determines the service life of the whole generator set. The wind power main shaft is usually manufactured by adopting a forging process.
Forging is a processing method which utilizes forging machinery to apply pressure on a metal blank to enable the metal blank to generate plastic deformation so as to obtain a forging with certain mechanical property, certain shape and certain size. Important parts with high load and severe working conditions in related machines are mainly forged pieces except for plates, sections or welding pieces which are simple in shape and can be rolled.
The mandrel can be adopted for drawing out in the forging of the wind power main shaft in the prior art, and the forging has very high temperature during drawing out, so that the temperature of the mandrel entering the forging is increased, the mandrel is heated to be too high, the volume expansion of the mandrel is too large to be attached to the wall of the forging hole, the friction force between the mandrel and the hole wall is too large, the difficulty of drawing out the mandrel is increased, and the machining efficiency is easily reduced.
Disclosure of Invention
Therefore, the embodiment of the invention provides a wind power main shaft forging process, which is characterized in that a core rod is heated before being drawn out, so that the temperature rise amount of the core rod after the core rod enters a forge piece is reduced, the thermal expansion amount of the core rod is effectively reduced, the core rod is cooled after being drawn out, the cooling volume of the core rod is effectively reduced, the core rod and the hole wall of the forge piece are effectively prevented from being tightly stuck and locked, the friction force between the core rod and the forge piece is reduced, the core rod is convenient to withdraw, and the machining efficiency is further ensured.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a wind power main shaft forging process comprises the following specific forging steps:
s1, raw material pretreatment: carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot in sequence;
s2, heating: feeding the treated steel ingot into a heating furnace for heating and then preserving heat;
s3, embryo preparation: discharging the steel ingot out of the furnace, chamfering the steel ingot into a round billet, pressing a jaw at the riser end of the steel ingot, and cutting off the tail of the steel ingot to obtain a steel ingot blank;
s4, upsetting: feeding the steel ingot blank into a heating furnace, heating, preserving heat, taking out, putting into an upsetting bushing, upsetting at the maximum forging pressure of a press, and continuously and uniformly rotating the steel ingot in the upsetting process;
s5, elongation: drawing a steel ingot by using a wide flat anvil, then sending the steel ingot into a heating furnace for heating and heat preservation, then taking out the steel ingot, drawing steps of each part of the steel ingot to a design size according to a drawing, then cutting off excess materials of a water gap and a riser at two ends of the steel ingot, and then sending the steel ingot into the furnace for heating and heat preservation;
s6, upsetting the flange end: taking out the forged piece, putting the forged piece on a special tool for the wind power main shaft consisting of a rotary workbench and a bushing plate, upsetting the flange end by using a press, rotationally forging the flange end material to a drawing size by using an upper flat anvil, rounding and flattening the outer diameter of the flange, punching a through hole on the flange end by using a long punch, and heating and insulating a forging blank in a furnace;
s7, drawing out the mandrel: manufacturing a hollow core rod by using a hollow die, placing the hollow core rod in a heating furnace for heating, then placing the core rod in a forging stock through hole for drawing, introducing cold water into the hollow core rod after drawing to help the core rod cool, then withdrawing the core rod, then placing the hollow core rod in the heating furnace for heating again, then placing the core rod in the forging stock through hole from the opposite direction for drawing again, introducing cold water into the hollow core rod after drawing to help the core rod cool, and then withdrawing the core rod;
s8, heat treatment: cooling the forging and then carrying out a heat treatment process;
s9, detection: and carrying out ultrasonic flaw detection on the whole shaft, carrying out quenching and tempering heat treatment after nondestructive detection, then carrying out secondary detection, carrying out finish machining and spraying according to a drawing after nondestructive detection, and finally completing qualified inspection.
Further, the preprocessing step in step S1 is:
s1.1, smelting in an electric furnace: the furnace wall coherent oxygen lance ultrahigh power electric arc furnace is adopted for enhanced oxygen supply, and carbon powder is injected into the furnace for foam slag making operation, so that sufficient decarburization quantity and decarburization speed are ensured;
s1.2, LF refining: argon gas is blown at the bottom during power transmission and stirred, and diffusion deoxidization is carried out by adopting a diffusion deoxidant;
s1.3, VD vacuum treatment: before entering a VD station, part of refining slag is removed to enhance the vacuum degassing effect, reduce slag overflow and ensure the clearance of a steel ladle so as to obtain a low-oxygen and high-cleanliness steel ingot.
Further, in step S2, the temperature of the ingot is first raised to 800 ℃ for 3-5h after the ingot is placed into the furnace, and then the ingot is heated to 1300 ℃ for 1200 ℃ for 10-15 h.
Further, in the step S4, the ingot blank is heated to 1220-.
Further, in step S5, the feeding anvil amount during the drawing of the wide flat anvil is 0.6-0.8 times of the height of the ingot before pressing, the rolling reduction amount is controlled at 16-22% to ensure that the core blank at the two ends of the ingot in a high temperature state is effectively bulged, the ingot is put into a furnace for the first time and heated to 1150-.
Further, in step S6, the forging stock is heated in a furnace at 1080-1100 ℃, and the temperature is maintained for 0.5-1 h.
Further, the hollow core rod heating temperature is 500-700 ℃ at step S7.
Further, in step S8, the temperature of the forging is lowered to 400-500 ℃.
The embodiment of the invention has the following advantages:
according to the invention, the steel ingot with low oxygen and high cleanliness is obtained by sequentially carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot, the adopted forging process is proper, so that the strength of the forged wind power main shaft is high, the quality is good, the service life is effectively prolonged, the temperature rise amount of the core rod after entering the forging is reduced by heating the core rod before drawing the core rod, the thermal expansion amount of the core rod is effectively reduced, the core rod is cooled after drawing, the cooling volume of the core rod is effectively reduced, the core rod is effectively prevented from being tightly adhered to the hole wall of the forging to be locked, the friction force between the core rod and the forging is reduced, the core rod is convenient to withdraw, and the machining efficiency is further ensured.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a wind power main shaft forging process which comprises the following specific forging steps:
s1, raw material pretreatment: the method for sequentially carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot comprises the following steps:
s1.1, smelting in an electric furnace: the furnace wall coherent oxygen lance ultrahigh power electric arc furnace is adopted for enhanced oxygen supply, and carbon powder is injected into the furnace for foam slag making operation, so that sufficient decarburization quantity and decarburization speed are ensured;
s1.2, LF refining: argon gas is blown at the bottom during power transmission and stirred, and diffusion deoxidization is carried out by adopting a diffusion deoxidant;
s1.3, VD vacuum treatment: before entering a VD station, removing partial refining slag to enhance the vacuum degassing effect, reduce slag overflow and ensure the clearance of a steel ladle so as to obtain a low-oxygen and high-cleanliness steel ingot;
s2, heating: sending the treated steel ingot into a heating furnace, heating to 700 ℃, preserving heat for 3 hours, then heating to 1200 ℃, and preserving heat for 10 hours;
s3, embryo preparation: discharging the steel ingot out of the furnace, chamfering the steel ingot into a round billet, pressing a jaw at the riser end of the steel ingot, and cutting off the tail of the steel ingot to obtain a steel ingot blank;
s4, upsetting: feeding the steel ingot blank into a heating furnace, heating to 1220 ℃, preserving heat for 8h, taking out, placing into an upsetting drain pan, upsetting at the maximum forging pressure of a press, wherein the steel ingot needs to continuously and uniformly rotate in the upsetting process, and the height-diameter ratio after upsetting is 0.6;
s5, elongation: drawing a steel ingot by using a wide flat anvil, wherein the anvil feeding amount is 0.6 times of the height of the ingot before pressing, the rolling reduction amount is controlled at 16% so as to ensure that core blanks at two ends of the ingot in a high-temperature state effectively bulge out, then sending the blanks into a heating furnace to be heated to 1150 ℃, keeping the temperature for 2 hours, then taking out the blanks, drawing the steps of each part of the steel ingot to the designed size according to a drawing, then cutting off water gaps and riser excess materials at two ends of the steel ingot, then sending the blanks into the furnace to be heated to 1150 ℃, and keeping the temperature for 2 hours;
s6, upsetting the flange end: taking out the forged piece, putting the forged piece on a special tool for the wind power main shaft consisting of a rotary workbench and a bushing plate, upsetting the flange end by using a press, rotationally forging the flange end material to a drawing size by using an upper flat anvil, rolling and flattening the outer diameter of the flange, punching a through hole on the flange end by using a long punch, heating the forging stock in a furnace to 1080 ℃, and preserving heat for 0.5 h;
s7, drawing out the mandrel: manufacturing a hollow core rod by using a hollow die, placing the hollow core rod in a heating furnace, heating to 500 ℃, then placing the core rod in a forging stock through hole for drawing, introducing cold water into the hollow core rod after drawing to help the core rod cool, then withdrawing the core rod, then placing the hollow core rod in the heating furnace again, heating to 500 ℃, then placing the core rod in the forging stock through hole from the opposite direction for drawing again, introducing cold water into the hollow core rod after drawing to help the core rod cool, and then withdrawing the core rod;
s8, heat treatment: cooling the forging to 400 ℃ and then carrying out a heat treatment process;
s9, detection: and carrying out ultrasonic flaw detection on the whole shaft, carrying out quenching and tempering heat treatment after nondestructive detection, then carrying out secondary detection, carrying out finish machining and spraying according to a drawing after nondestructive detection, and finally completing qualified inspection.
Example 2:
the invention provides a wind power main shaft forging process which comprises the following specific forging steps:
s1, raw material pretreatment: the method for sequentially carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot comprises the following steps:
s1.1, smelting in an electric furnace: the furnace wall coherent oxygen lance ultrahigh power electric arc furnace is adopted for enhanced oxygen supply, and carbon powder is injected into the furnace for foam slag making operation, so that sufficient decarburization quantity and decarburization speed are ensured;
s1.2, LF refining: argon gas is blown at the bottom during power transmission and stirred, and diffusion deoxidization is carried out by adopting a diffusion deoxidant;
s1.3, VD vacuum treatment: before entering a VD station, removing partial refining slag to enhance the vacuum degassing effect, reduce slag overflow and ensure the clearance of a steel ladle so as to obtain a low-oxygen and high-cleanliness steel ingot;
s2, heating: sending the treated steel ingot into a heating furnace, heating to 750 ℃, preserving heat for 4 hours, then heating to 1250 ℃, and preserving heat for 12.5 hours;
s3, embryo preparation: discharging the steel ingot out of the furnace, chamfering the steel ingot into a round billet, pressing a jaw at the riser end of the steel ingot, and cutting off the tail of the steel ingot to obtain a steel ingot blank;
s4, upsetting: feeding the steel ingot blank into a heating furnace, heating to 1245 ℃, preserving heat for 9 hours, taking out, putting into an upsetting drain pan, upsetting at the maximum forging pressure of a press, wherein the steel ingot needs to rotate continuously and uniformly in the upsetting process, and the height-diameter ratio after upsetting is 0.8;
s5, elongation: drawing a steel ingot by using a wide flat anvil, wherein the anvil feeding amount is 0.7 times of the height of the ingot body before pressing, the rolling reduction amount is controlled at 18 percent to ensure that core blanks at two ends of the ingot body in a high-temperature state are effectively bulged out, then sending the blanks into a heating furnace to be heated to 1185 ℃, keeping the temperature for 2.5 hours, then taking out the blanks, drawing steps of each part of the steel ingot to the designed size according to a drawing, then cutting off water gaps and riser excess materials at two ends of the steel ingot, then feeding the blanks into the furnace to be heated to 1185 ℃, and keeping the temperature for 2.5 hours;
s6, upsetting the flange end: taking out the forged piece, putting the forged piece on a special tool for the wind power main shaft consisting of a rotary workbench and a bushing disc, upsetting the flange end by using a press, rotationally forging the flange end material to the drawing size by using an upper flat anvil, then rounding and flattening the outer diameter of the flange, punching a through hole on the flange end by using a long punch, then heating the forging stock in a furnace to 1090 ℃, and preserving heat for 0.75 h;
s7, drawing out the mandrel: manufacturing a hollow core rod by using a hollow die, placing the hollow core rod in a heating furnace, heating to 600 ℃, then placing the core rod in a forging stock through hole for drawing, introducing cold water into the hollow core rod after drawing to help the core rod cool, then withdrawing the core rod, then placing the hollow core rod in the heating furnace again, heating to 600 ℃, then placing the core rod in the forging stock through hole from the opposite direction for drawing again, introducing cold water into the hollow core rod after drawing to help the core rod cool, and then withdrawing the core rod;
s8, heat treatment: cooling the forging to 450 ℃ and then carrying out a heat treatment process;
s9, detection: and carrying out ultrasonic flaw detection on the whole shaft, carrying out quenching and tempering heat treatment after nondestructive detection, then carrying out secondary detection, carrying out finish machining and spraying according to a drawing after nondestructive detection, and finally completing qualified inspection.
Example 3:
the invention provides a wind power main shaft forging process which comprises the following specific forging steps:
s1, raw material pretreatment: the method for sequentially carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot comprises the following steps:
s1.1, smelting in an electric furnace: the furnace wall coherent oxygen lance ultrahigh power electric arc furnace is adopted for enhanced oxygen supply, and carbon powder is injected into the furnace for foam slag making operation, so that sufficient decarburization quantity and decarburization speed are ensured;
s1.2, LF refining: argon gas is blown at the bottom during power transmission and stirred, and diffusion deoxidization is carried out by adopting a diffusion deoxidant;
s1.3, VD vacuum treatment: before entering a VD station, removing partial refining slag to enhance the vacuum degassing effect, reduce slag overflow and ensure the clearance of a steel ladle so as to obtain a low-oxygen and high-cleanliness steel ingot;
s2, heating: sending the treated steel ingot into a heating furnace, heating to 800 ℃, preserving heat for 5 hours, then heating to 1300 ℃, and preserving heat for 15 hours;
s3, embryo preparation: discharging the steel ingot out of the furnace, chamfering the steel ingot into a round billet, pressing a jaw at the riser end of the steel ingot, and cutting off the tail of the steel ingot to obtain a steel ingot blank;
s4, upsetting: feeding the steel ingot blank into a heating furnace, heating to 1270 ℃, preserving heat for 10 hours, taking out, placing into an upsetting drain pan, upsetting at the maximum forging pressure of a press, wherein the steel ingot needs to continuously and uniformly rotate in the upsetting process, and the height-diameter ratio after upsetting is 1;
s5, elongation: drawing a steel ingot by using a wide flat anvil, wherein the anvil feeding amount is 0.8 times of the height of the ingot before pressing, the rolling reduction amount is controlled to be 22 percent, so as to ensure that core blanks at two ends of the ingot in a high-temperature state effectively bulge out, then sending the core blanks into a heating furnace to be heated to 1220 ℃, keeping the temperature for 3 hours, then taking out the core blanks, drawing the steps of each part of the steel ingot to the designed size according to a drawing, then cutting off water gaps and riser excess materials at two ends of the steel ingot, then sending the steel ingot into the furnace to be heated to 1220 ℃, and keeping the temperature for 3 hours;
s6, upsetting the flange end: taking out the forged piece, putting the forged piece on a special tool for the wind power main shaft consisting of a rotary workbench and a bushing plate, upsetting the flange end by using a press, rotationally forging the flange end material to the drawing size by using an upper flat anvil, rolling the outer diameter of the flange to be round and flat, punching a through hole on the flange end by using a long punch, heating the forging stock in a furnace to 1100 ℃, and preserving heat for 1 h;
s7, drawing out the mandrel: manufacturing a hollow core rod by using a hollow die, placing the hollow core rod in a heating furnace, heating to 700 ℃, then placing the core rod in a forging stock through hole for drawing, introducing cold water into the hollow core rod after drawing to help the core rod cool, then withdrawing the core rod, then placing the hollow core rod in the heating furnace again, heating to 700 ℃, then placing the core rod in the forging stock through hole from the opposite direction for drawing again, introducing cold water into the hollow core rod after drawing to help the core rod cool, and then withdrawing the core rod;
s8, heat treatment: cooling the forging to 500 ℃ and then carrying out a heat treatment process;
s9, detection: and carrying out ultrasonic flaw detection on the whole shaft, carrying out quenching and tempering heat treatment after nondestructive detection, then carrying out secondary detection, carrying out finish machining and spraying according to a drawing after nondestructive detection, and finally completing qualified inspection.
Example 4:
respectively taking 90 wind power main shafts prepared in the embodiments 1 to 3 to perform mechanical detection, wherein each 30 wind power main shafts are divided into three groups to be detected respectively, and the following data are obtained after detection:
as can be seen from the above table, in the embodiment 3, the forging process is suitable, the forged wind power main shaft has high tensile strength and yield strength, and high hardness, and effectively resists external impact, and meanwhile, the reduction of area and the elongation are high, so that the service life is long.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A wind power main shaft forging process is characterized in that: the specific forging steps are as follows:
s1, raw material pretreatment: carrying out electric furnace smelting, LF refining and VD vacuum treatment on the steel ingot in sequence;
s2, heating: feeding the treated steel ingot into a heating furnace for heating and then preserving heat;
s3, blank making: discharging the steel ingot out of the furnace, chamfering the steel ingot into a round billet, pressing a jaw at the riser end of the steel ingot, and cutting off the tail of the steel ingot to obtain a steel ingot blank;
s4, upsetting: feeding the steel ingot blank into a heating furnace, heating, preserving heat, taking out, putting into an upsetting bushing, upsetting at the maximum forging pressure of a press, and continuously and uniformly rotating the steel ingot in the upsetting process;
s5, elongation: drawing a steel ingot by using a wide flat anvil, then sending the steel ingot into a heating furnace for heating and heat preservation, then taking out the steel ingot, drawing steps of each part of the steel ingot to a design size according to a drawing, then cutting off excess materials of a water gap and a riser at two ends of the steel ingot, and then sending the steel ingot into the furnace for heating and heat preservation;
s6, upsetting the flange end: taking out the forged piece, putting the forged piece on a special tool for the wind power main shaft consisting of a rotary workbench and a bushing plate, upsetting the flange end by using a press, rotationally forging the flange end material to a drawing size by using an upper flat anvil, rounding and flattening the outer diameter of the flange, punching a through hole on the flange end by using a long punch, and heating and insulating a forging blank in a furnace;
s7, drawing out the mandrel: manufacturing a hollow core rod by using a hollow die, placing the hollow core rod in a heating furnace for heating, then placing the core rod in a forging stock through hole for drawing, introducing cold water into the hollow core rod after drawing to help the core rod cool, then withdrawing the core rod, then placing the hollow core rod in the heating furnace for heating again, then placing the core rod in the forging stock through hole from the opposite direction for drawing again, introducing cold water into the hollow core rod after drawing to help the core rod cool, and then withdrawing the core rod;
s8, heat treatment: cooling the forging and then carrying out a heat treatment process;
s9, detection: and carrying out ultrasonic flaw detection on the whole shaft, carrying out quenching and tempering heat treatment after nondestructive detection, then carrying out secondary detection, carrying out finish machining and spraying according to a drawing after nondestructive detection, and finally completing qualified inspection.
2. The wind power main shaft forging process according to claim 1, wherein: the preprocessing steps in step S1 are:
s1.1, smelting in an electric furnace: the furnace wall coherent oxygen lance is adopted to supply oxygen to the ultra-high power electric arc furnace in an intensified manner, carbon powder is injected into the furnace to make foam slag, and sufficient decarburization quantity and decarburization speed are ensured;
s1.2, LF refining: argon gas is blown at the bottom during power transmission and stirred, and diffusion deoxidization is carried out by adopting a diffusion deoxidant;
s1.3, VD vacuum treatment: before entering a VD station, part of refining slag is removed to enhance the vacuum degassing effect, reduce slag overflow and ensure the clearance of a steel ladle so as to obtain a low-oxygen and high-cleanliness steel ingot.
3. The wind power main shaft forging process according to claim 1, wherein: in step S2, the temperature of the steel ingot is raised to 800 ℃ for 700-.
4. The wind power main shaft forging process according to claim 1, wherein: in step S4, the ingot blank is heated to 1220-.
5. The wind power main shaft forging process according to claim 1, wherein: in step S5, the feeding anvil amount during the drawing of the wide flat anvil is 0.6-0.8 times of the height of the ingot before pressing, the pressing amount is controlled at 16-22% to ensure that the core blank at the two ends of the ingot in a high temperature state is effectively blown out, the ingot is put into a furnace for the first time and heated to 1150-.
6. The wind power main shaft forging process according to claim 1, wherein: in step S6, the forging stock is heated in a furnace at 1080-1100 ℃, and the temperature is maintained for 0.5-1 h.
7. The wind power main shaft forging process according to claim 1, wherein: the hollow core rod heating temperature is 500-700 ℃ in step S7.
8. The wind power main shaft forging process according to claim 1, wherein: in step S8, the temperature of the forging is reduced to 400-500 ℃.
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| CN111468668B (en) * | 2020-05-11 | 2022-02-15 | 张家港广大特材股份有限公司 | Wind power main shaft forging process |
| CN114317893A (en) * | 2021-12-29 | 2022-04-12 | 张家港广大特材股份有限公司 | Manufacturing method of magnetic yoke ring forging |
| CN116060562B (en) * | 2023-03-07 | 2023-06-30 | 张家港广大特材股份有限公司 | Forging and drawing process for austenitic acid-resistant alloy steel shaft piece |
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| CN104338882A (en) * | 2013-08-07 | 2015-02-11 | 上海重型机器厂有限公司 | Forming method of motor enclosure forging of third-generation nuclear power coolant pump |
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| CN111468668A (en) * | 2020-05-11 | 2020-07-31 | 张家港广大特材股份有限公司 | Wind power main shaft forging process |
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| CN102806291A (en) * | 2012-08-24 | 2012-12-05 | 江苏凌飞锻造有限公司 | Wind-powered main shaft forging method |
| CN103909423A (en) * | 2013-01-03 | 2014-07-09 | 庆南科技园公司 | Manufacturing method of main shaft for wind turbine |
| CN104338882A (en) * | 2013-08-07 | 2015-02-11 | 上海重型机器厂有限公司 | Forming method of motor enclosure forging of third-generation nuclear power coolant pump |
| CN104801642A (en) * | 2015-01-31 | 2015-07-29 | 江苏金源锻造股份有限公司 | Forging technique of gear coupling |
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| CN106238661A (en) * | 2016-08-26 | 2016-12-21 | 江阴振宏重型锻造有限公司 | The hollow forging technique of large-scale wind electricity main-axis |
| CN109290503A (en) * | 2018-08-27 | 2019-02-01 | 山东莱芜金雷风电科技股份有限公司 | The hollow nearly molding forging method of big MW wind power principal axis |
| CN210059669U (en) * | 2019-05-14 | 2020-02-14 | 苏州市东吴锻焊厂有限公司 | Free forging drawing is with crossing water plug frock |
| CN111468668A (en) * | 2020-05-11 | 2020-07-31 | 张家港广大特材股份有限公司 | Wind power main shaft forging process |
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