CN110205563B - Preparation method of magnetic yoke forging for large pumped storage power generation motor - Google Patents
Preparation method of magnetic yoke forging for large pumped storage power generation motor Download PDFInfo
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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
- B21J5/002—Hybrid process, e.g. forging following casting
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
The invention discloses a preparation method of a magnetic yoke forging for a large pumped storage power generation motor, which can be used for manufacturing a magnetic yoke forging with the thickness of 370mm and the yield strength of not less than 690 MPa. Based on the total weight of the alloy: less than or equal to 0.20 percent of carbon, less than or equal to 1.80 percent of manganese, less than or equal to 0.37 percent of silicon, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.005 percent of sulfur, less than or equal to 0.70 percent of chromium, 0.80 to 2.00 percent of nickel, 0.20 to 0.50 percent of molybdenum, less than or equal to 0.10 percent of vanadium, less than or equal to 0.20 percent of copper, less than or equal to 0.04 percent of niobium, less than or equal to 0.. The invention provides a magnetic yoke forging for a large pumped storage power generation motor, which is a low-alloy ultrahigh-strength material with ultrahigh thickness, ultrahigh strength and good magnetic induction strength. The quality and the stability of the integral rigid magnet yoke can be ensured, and the integral rigid magnet yoke of the high-capacity and high-rotating-speed pumped storage generator motor can be used.
Description
The technical field is as follows: the invention relates to the field of pumped storage power generation motors, in particular to a method for manufacturing a magnetic yoke forging for a large pumped storage power generation motor.
Background art: the magnetic yoke is a part for fixing the magnetic pole in the generator motor, plays an important role in the operation process of the generator motor set, and the stability of the magnetic yoke structure directly influences the safe and reliable operation of the set. The magnetic yoke is also an important component of a magnetic circuit of the generator motor, and the magnetic yoke is subjected to the comprehensive action of centrifugal force, electromagnetic force and torque in the operation process, so that the generator motor has high requirements on various properties of the magnetic yoke material. The mixed-flow generator motor is generally made of a high-strength hot-rolled thin steel plate with the thickness of 2-4 mm, while the pumped storage generator motor is poor in working condition operation due to frequent starting and stopping, positive and negative rotation and high rotating speed, and has more strict requirements on materials for a magnetic yoke, and a high-strength quenched and tempered medium plate with the thickness of 50-60 mm is generally adopted.
At present, along with the continuous improvement of the technical level of domestic generating motors, most of high-capacity and high-rotation-speed pumped storage generating motors adopt high-strength annular thick steel plates to laminate magnetic yokes, the height of each magnetic yoke section is 300mm, 9 sections are provided, each section is formed by assembling 5 annular steel plates with the thickness of 60mm, and each magnetic yoke steel plate needs to be leveled or processed and is connected into a whole through bolts. However, the whole round thick steel plate laminating has the defects of low steel plate utilization rate, complex manufacturing process, long manufacturing period, gaps among the steel plates at the magnetic yoke section and the like.
In order to solve the problems, the integral annular forged piece magnetic yoke is adopted to replace an annular thick steel plate laminated magnetic yoke, so that the integral quality and stability of the rigid magnetic yoke of the large pumped storage generator motor can be effectively improved.
The invention content is as follows: the invention solves the technical problem of providing a method for preparing a low-alloy ultrahigh-strength steel forging which can be applied to the field of large pumped storage generator motors and used as a magnet yoke, and the method has the advantages of manufacturing thickness of 370mm, yield strength of not less than 690MPa and good magnetic induction strength. The method comprises the following steps:
1) smelting raw materials with the weight percentage of less than or equal to 0.20 percent of carbon, less than or equal to 1.80 percent of manganese, less than or equal to 0.37 percent of silicon, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.005 percent of sulfur, less than or equal to 0.70 percent of chromium, 0.80-2.00 percent of nickel, 0.20-0.50 percent of molybdenum, less than or equal to 0.10 percent of vanadium, less than or equal to 0.20 percent of copper, less than or equal to 0.04 percent of niobium, less than or equal to 0.005 percent of titanium and less than or equal to 0.005 percent of boron by adopting an electric furnace, carrying out vacuum refining, wherein the relative vacuum degree is less than-133;
2) heating the alloy ingot obtained in the step 1) to 1200-1300 ℃, preserving heat for more than or equal to 6 hours, then performing first forging on a hydraulic press, wherein the forging ratio is not lower than 7, then cutting off a water gap and a riser, then heating the ingot blank to 1200-1300 ℃, preserving heat for more than or equal to 3 hours, and performing second forging, wherein the forging ratio is not lower than 2, thus obtaining a twice-forged ingot;
3) removing surface oxide skin of the ingot forging vehicle obtained in the step 2) to obtain a pure ingot forging;
4) uniformly heating the forging ingot obtained in the step 3) to 860-960 ℃, preserving heat for more than or equal to 8 hours, then air-cooling, uniformly heating to 600-700 ℃, preserving heat for more than or equal to 15 hours, and then cooling along with a furnace to obtain a normalizing and tempering preliminary heat treatment forging ingot;
5) removing surface oxide skin of the ingot forging vehicle obtained in the step 4), uniformly heating to 860-960 ℃, keeping the temperature for more than or equal to 8 hours, then cooling by water, uniformly heating to 560-660 ℃, keeping the temperature for more than or equal to 15 hours, and then cooling by air to obtain a quenched and tempered heat treatment ingot forging;
6) and (3) machining the magnet yoke forging blank obtained in the step 5) according to a drawing to obtain a magnet yoke forging product.
The technical effects are as follows:
compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of a magnetic yoke forging for a large pumped storage power generation motor, which improves the low-temperature toughness of the magnetic yoke forging while improving the material strength by reasonably optimizing the chemical composition design, strictly controls harmful phosphorus and sulfur elements by vacuum refining treatment, refines crystal grains by the micro-alloying effect of trace elements such as niobium, titanium, boron and the like, further refines the crystal grains by the secondary forging and the preliminary heat treatment process of normalizing and tempering, provides the plastic reserve of the early stage for the performance heat treatment process of quenching and tempering, finally obtains the magnetic yoke forging material with the yield strength of not less than 690MPa, the impact power of not less than 47J (0 ℃), the magnetic induction strength of not less than 1.55T and excellent comprehensive performance, and each technical index of the magnetic yoke forging material reaches the level of a laminated magnetic yoke steel plate with the same strength, meanwhile, the thickness of the manufactured magnetic yoke forging piece reaches 370mm, the appearance of the blank is annular, the material utilization rate is high, the period of early-stage manufacturing and later-stage processing is greatly shortened, and compared with a steel plate, a large amount of production and manufacturing cost is saved. The integral annular forging magnet yoke effectively improves the integral quality and stability of the rigid magnet yoke of the large pumped storage generator motor.
Description of the drawings:
FIG. 1 is a schematic diagram of the steps of a method for manufacturing a magnetic yoke forging for a large pumped storage power generation motor according to the invention;
FIG. 2 shows the test results of the examples.
The specific implementation mode is as follows:
the following is a description of the principles and features of the present invention, the examples being included merely for purposes of illustration and are not intended to limit the scope of the invention.
Example (b):
based on the total weight of the alloy: 0.15% of carbon, 1.47% of manganese, 0.21% of silicon, 0.008% of phosphorus, 0.001% of sulfur, 0.32% of chromium, 1.02% of nickel, 0.40% of molybdenum, 0.010% of vanadium, 0.087% of copper, 0.035% of niobium, 0.0013% of titanium and 0.0003% of boron;
the preparation method comprises the following steps: smelting the raw materials in an electric furnace, refining in a vacuum smelting furnace, smelting at 1680 ℃ for 0.3h, and casting into alloy cast ingots; heating the prepared alloy ingot to 1250 ℃, preserving heat for 8 hours, then forging for the first time on a hydraulic press with the forging ratio of 8, then cutting off a water gap and a dead head, then heating the ingot to 1250 ℃, preserving heat for 3 hours, and then forging for the second timeForging, wherein the forging ratio is 3, removing surface oxide skin by turning, uniformly heating a forging ingot to 930 ℃, preserving heat for 10 hours, then air-cooling, uniformly heating to 660 ℃, preserving heat for 20 hours, then cooling along with a furnace, removing surface oxide skin by turning, uniformly heating the forging ingot to 920 ℃, preserving heat for 10 hours, then water-cooling, uniformly heating to 560 ℃, preserving heat for 25 hours, then air-cooling, and preparing the forging ingot with the inner diameter
About 31351kg of overlapping swaged ingots.
The performance of the alloy forging ingot prepared in the embodiment is tested according to the design and use requirements, the sampling position is the inner circle tangential thickness 1/2, and the test result is shown in fig. 2:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. The preparation method of the magnetic yoke forging for the large pumped storage power generation motor is characterized by comprising the following steps of:
the method comprises the following steps:
1) smelting raw materials with the weight percentage of less than or equal to 0.20 percent of carbon, less than or equal to 1.80 percent of manganese, less than or equal to 0.37 percent of silicon, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.005 percent of sulfur, less than or equal to 0.70 percent of chromium, 1.02 to 2.00 percent of nickel, 0.20 to 0.50 percent of molybdenum, less than or equal to 0.10 percent of vanadium, less than or equal to 0.20 percent of copper, less than or equal to 0.04 percent of niobium, less than or equal to 0.005 percent of titanium and less than or equal to 0.005 percent of boron by adopting an electric furnace, carrying out vacuum refining, wherein the relative vacuum degree is less than-133;
2) heating the alloy ingot obtained in the step 1) to 1200-1300 ℃, preserving heat for more than or equal to 6 hours, then performing first forging on a hydraulic press, wherein the forging ratio is not lower than 7, then cutting off a water gap and a riser, then heating the ingot blank to 1200-1300 ℃, preserving heat for more than or equal to 3 hours, and performing second forging, wherein the forging ratio is not lower than 2, thus obtaining a twice-forged ingot;
3) removing surface oxide skin of the ingot forging vehicle obtained in the step 2) to obtain a pure ingot forging;
4) uniformly heating the forging ingot obtained in the step 3) to 860-960 ℃, preserving heat for more than or equal to 8 hours, then air-cooling, uniformly heating to 600-700 ℃, preserving heat for more than or equal to 15 hours, and then cooling along with a furnace to obtain a normalizing and tempering preliminary heat treatment forging ingot;
5) removing surface oxide skin of the ingot forging vehicle obtained in the step 4), uniformly heating to 860-960 ℃, keeping the temperature for more than or equal to 8 hours, then cooling by water, uniformly heating to 560-660 ℃, keeping the temperature for more than or equal to 15 hours, and then cooling by air to obtain a quenched and tempered heat treatment ingot forging;
6) the size of the performance heat treatment forging ingot in the step 5) is
7) And (3) machining the magnet yoke forging blank obtained in the step 5) according to a drawing to obtain a magnet yoke forging product.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110791716A (en) * | 2019-12-04 | 2020-02-14 | 中国第一重型机械股份公司 | Manufacturing method of 18MnCrNiMo magnetic yoke integral forging of hydroelectric pumped storage unit |
| CN113564472A (en) * | 2021-07-21 | 2021-10-29 | 通裕重工股份有限公司 | Whole-circular-ring magnetic yoke forging and tempering process thereof |
| CN113528797B (en) * | 2021-07-21 | 2023-06-06 | 通裕重工股份有限公司 | Post-forging heat treatment process of whole circular yoke forging |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH083681A (en) * | 1994-06-22 | 1996-01-09 | Aichi Steel Works Ltd | Steel for machine structural use, excellent in cold workability |
| CN102605271A (en) * | 2012-03-31 | 2012-07-25 | 三一集团有限公司 | Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel |
| CN109022686A (en) * | 2018-07-20 | 2018-12-18 | 张家港中环海陆特锻股份有限公司 | The manufacturing method of the high cartridge type ring forging of super-tonnage |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH083681A (en) * | 1994-06-22 | 1996-01-09 | Aichi Steel Works Ltd | Steel for machine structural use, excellent in cold workability |
| CN102605271A (en) * | 2012-03-31 | 2012-07-25 | 三一集团有限公司 | Low-alloy high-intensity high-toughness steel and production method of low-alloy high-intensity high-toughness steel |
| CN109022686A (en) * | 2018-07-20 | 2018-12-18 | 张家港中环海陆特锻股份有限公司 | The manufacturing method of the high cartridge type ring forging of super-tonnage |
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