CN102350474A - Control method for hot forging structure property of Mn18Cr18N steel retaining ring - Google Patents

Control method for hot forging structure property of Mn18Cr18N steel retaining ring Download PDF

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Publication number
CN102350474A
CN102350474A CN2011102381682A CN201110238168A CN102350474A CN 102350474 A CN102350474 A CN 102350474A CN 2011102381682 A CN2011102381682 A CN 2011102381682A CN 201110238168 A CN201110238168 A CN 201110238168A CN 102350474 A CN102350474 A CN 102350474A
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temperature
heating furnace
heated
broaching
putting
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CN2011102381682A
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CN102350474B (en
Inventor
何文武
赵晓东
陈慧琴
秦敏
刘建生
郭会光
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Taiyuan University of Science and Technology
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Taiyuan University of Science and Technology
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Abstract

The invention relates to a control method for the hot forging structure property of a Mn18Cr18N steel retaining ring, belongs to the technical field of a metal pressure machining. The operation method of the invention comprises the following steps: (1) sheathing a soft steel sleeve outside blanks and putting the soft steel sleeve and the blanks together into a heating furnace to be heated to 1180-1220 DEG C; (2) putting the heated blanks wrapped with the sleeve externally into a cylinder die and punching the blanks by utilizing a plunger chip; when the plunger chip load is increased to the load allowed by a press machine, replacing a chassis by a drain cap to carry out extrusion and losing the gross weight; (3) putting the annular blanks which is extruded into the heating furnace to be heated to 1100-1150 DEG C and keeping the temperature for 1-3 hours; (4) carrying out the broaching on a mandrel at the first circle and controlling the deformation amount between 13-18%; (5) when the temperature in the broaching process is reduced below the final forging temperature, putting into the heating furnace and heating to 1100 DEG C as well as keeping the temperature for 1 hour; (6) carrying out the broaching on a mandrel at the second circle and controlling the deformation amount between 9-13%; (7) when the temperature in the broaching process is reduced below the final forging temperature, putting into the heating furnace again and heating to 1100 DEG C as well as keeping the temperature for 1 hour; and (8) continuously carrying out the broaching on the mandrel until the dimension requirements are met. The method has the advantages that the phenomenon of generating cracks on the surface of a forge piece in the deformation process in the prior art can be prevented; and the deformation on the external surface of the forge piece is increased in the multiple broaching processes of the mandrel, thereby refining grains more uniformly and improving the quality of the forge piece.

Description

Mn18Cr18N 18 N steel guard ring forge hot structure property control method
Technical field
The invention belongs to the stress metal manufacture field, be specifically related to a kind of Mn18Cr18N 18 N steel guard ring forge hot structure property control method.
Background technology
Retaining ring is the nonmagnetic steel loop that is contained in the generator amature two ends, is used for the lock ring end coil.Bearing huge centrifugal force in the rotation at a high speed; Bear the concentrated stress effect of alternate stress that periodic motion produces, complicated erection stress, bending stress and the inhomogeneous generation of structure; Force-bearing situation is extremely complicated; Operating mode is special; Manufacture difficulty is very big, is one of key member of thermoelectricity generating equipment.In order to guarantee the safe operation of generator, require retaining ring should have enough intensity, good toughness, uniform tissue performance and minimum residual stress, thereby manufacturing technology requires very high.Organize in tradition and just to be shaped aspect the Properties Control and to obtain tissue along with the flat-die forging base; Just only guarantee the forging shape and uncontrollable tissue; All uncontrollable in forming process in heating number of times, heating schedule and deformation process; And even the structure property after the distortion is very inhomogeneous, and it is uneven to have influence on the final products performance.And patent ZL 200510012565.2 " a kind of method and mould of making circular cog hot forged from generator protective ring " is: the mild steel jacket is heated together, be placed into then in the mould, its upper surface is put drift and is pressed down punching.When punch load rises to the press apparatus allowable load, to change drain cap and wash out gross weight, forming process finishes.This technology uses mould constraint to be shaped, and has replaced the plug pulling work step in the traditional handicraft, and blank is in compressive stress state, has solved the problem of blank surface cracking.But owing to extruding force required in the impact extrusion process is very big, cause and to be used for towards macropore, and blank bore area deflection is big in the impact extrusion process, and the external diameter surface deflection is little, cause the whole crystal grain skewness of forging.
Summary of the invention
The purpose of this invention is to provide a kind of Mn18Cr18N 18 N steel guard ring forge hot structure property control method, can overcome the shortcoming that prior art exists effectively.
The present invention realizes through following process:
1. the outside that the mild steel jacket is sleeved on blank is placed on together and is heated to 1180~1220 ℃ in the heating furnace;
2. the moulds of industrial equipment that punching is used are placed on the press platform, and the blank that more warmed-up outside is surrounded by the mild steel jacket is put into a mould, with drift to its punching; When punch load rises to the press apparatus allowable load; Remove the chassis of bottom, change drain cap and carry out impact extrusion, wash out gross weight;
3. the annular blank that again impact extrusion is become is put into heating furnace and is heated to 1100 ℃~1150 ℃, is incubated 1~3 hour;
4. carry out the reaming of first lap plug, deflection is controlled at 13%~18%;
5. in the reaming process, be reduced to final forging temperature when following when temperature, put heating furnace again into and be heated to 1100 ℃ again, be incubated 1 hour;
6. carry out the second circle plug reaming deflection and be controlled at 9%~13%;
7. be reduced to final forging temperature when following when temperature, put into heating furnace again and be heated to 1100 ℃, be incubated 1 hour;
8. proceed the plug reaming, till reaching dimensional requirement.
Advantage of the present invention and good effect are: the phenomenon that the forging surface cracks in the deformation process that 1. can prevent to exist in the prior art; 2. in plug reaming process repeatedly, suitably increase the distortion of forging outer surface, made grain refinement more even, improved the quality of forging.
The specific embodiment
1. the outside that No. 20 mild steel jackets of 20mm is sleeved on φ 820mm * 1100mm blank is placed on together and is heated to 1200 ℃ in the heating furnace;
2. the blank that warmed-up, outside is surrounded by the mild steel jacket is put into a mould; With drift it is pressed down punching, when punch load rises to the press apparatus allowable load, remove the chassis; Change drain cap and wash out gross weight, obtain to be of a size of the ring base of φ 910/ φ 400mm * 1100mm;
3. again that impact extrusion is good ring base is put into heating furnace and is heated to 1100 ℃~1150 ℃, is incubated 1 hour;
4. carry out the reaming of first lap plug, deflection is controlled at 40mm;
5. be reduced to final forging temperature when following when the reaming process temperature, will encircle base again and put into heating furnace and be heated to 1100 ℃ again, be incubated 1 hour;
6. carry out the second circle plug reaming, deflection is controlled at 25mm;
7. be reduced to final forging temperature when following when temperature, put into heating furnace again and be heated to 1100 ℃, be incubated 1 hour;
8. proceed the plug reaming, till diffusing into size and reaching φ 1000/ φ 620mm * 1100.
Adopt this method can obtain 3~4 grades of uniform tissue.

Claims (1)

1. Mn18Cr18N retaining ring forge hot structure property control method, comprise to blank heat, punching, links such as heating, plug reaming again, it is characterized in that operating procedure is following:
1. the outside that the mild steel jacket is sleeved on blank is placed on together and is heated to 1180~1220 ℃ in the heating furnace;
2. the frock that punching is used is placed on the press platform, and the blank that more warmed-up outside is surrounded by the mild steel jacket is put into a mould, with drift to its punching; When punch load rises to the press apparatus allowable load; Remove the chassis of bottom, change drain cap and carry out impact extrusion, wash out gross weight;
3. again impact extrusion blank is circlewise put into heating furnace and be heated to 1100 ℃~1150 ℃, be incubated 1~3 hour;
4. carry out the reaming of first lap plug, deflection is controlled at 13%~18%;
5. temperature is reduced to final forging temperature when following in the reaming process, puts heating furnace into and is heated to 1100 ℃ again, is incubated 1 hour;
6. carry out the second circle plug reaming deflection and be controlled at 9%~13%;
7. be reduced to final forging temperature when following when temperature, put into heating furnace again and be heated to 1100 ℃, be incubated 1 hour;
8. proceed the plug reaming till reaching dimensional requirement.
CN201110238168.2A 2011-08-19 2011-08-19 Control method for hot forging structure property of Mn18Cr18N steel retaining ring Expired - Fee Related CN102350474B (en)

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CN201110238168.2A CN102350474B (en) 2011-08-19 2011-08-19 Control method for hot forging structure property of Mn18Cr18N steel retaining ring

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008496A (en) * 2012-12-28 2013-04-03 德阳万鑫电站产品开发有限公司 Method for manufacturing non-magnetic steel thick-walled annular forged piece
CN103286248A (en) * 2013-05-10 2013-09-11 西安航空动力股份有限公司 Forging method of 1Cr12Ni3MoVN annular forged piece
CN105479107A (en) * 2015-12-18 2016-04-13 贵州航宇科技发展股份有限公司 Shaping method of annular forging of Rene41 alloy
CN106424497A (en) * 2016-12-27 2017-02-22 攀钢集团江油长城特殊钢有限公司 Forging method of Cr18Mn18N steel forge piece and forge piece
CN106670360A (en) * 2016-12-30 2017-05-17 西南铝业(集团)有限责任公司 Ring piece rolling method
CN107282854A (en) * 2017-08-11 2017-10-24 烟台台海玛努尔核电设备有限公司 A kind of manufacturing process of nuclear power retaining ring
CN107913962A (en) * 2017-12-05 2018-04-17 燕山大学 Suppress the method for large forgings hot forging face checking

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CN1736630A (en) * 2005-05-31 2006-02-22 太原科技大学 Method for producing circular cog hot forged from generator protective ring and mould
JP2007222923A (en) * 2006-02-24 2007-09-06 Antetsukusu:Kk Method for producing ring forging material
CN101987343A (en) * 2009-08-07 2011-03-23 上海重型机器厂有限公司 Forging method of conical cylinder body of nuclear power equipment
CN102126107A (en) * 2010-12-07 2011-07-20 西南铝业(集团)有限责任公司 Forging process of forged rings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1736630A (en) * 2005-05-31 2006-02-22 太原科技大学 Method for producing circular cog hot forged from generator protective ring and mould
JP2007222923A (en) * 2006-02-24 2007-09-06 Antetsukusu:Kk Method for producing ring forging material
CN101987343A (en) * 2009-08-07 2011-03-23 上海重型机器厂有限公司 Forging method of conical cylinder body of nuclear power equipment
CN102126107A (en) * 2010-12-07 2011-07-20 西南铝业(集团)有限责任公司 Forging process of forged rings

Non-Patent Citations (1)

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Title
付赟秋: "300MW护环芯棒扩孔工艺优化的试验与模拟研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, no. 4, 15 April 2011 (2011-04-15) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008496A (en) * 2012-12-28 2013-04-03 德阳万鑫电站产品开发有限公司 Method for manufacturing non-magnetic steel thick-walled annular forged piece
CN103008496B (en) * 2012-12-28 2015-12-23 德阳万鑫电站产品开发有限公司 A kind of manufacture method of nonmagnetic steel heavy wall annular forging piece
CN103286248A (en) * 2013-05-10 2013-09-11 西安航空动力股份有限公司 Forging method of 1Cr12Ni3MoVN annular forged piece
CN105479107A (en) * 2015-12-18 2016-04-13 贵州航宇科技发展股份有限公司 Shaping method of annular forging of Rene41 alloy
CN106424497A (en) * 2016-12-27 2017-02-22 攀钢集团江油长城特殊钢有限公司 Forging method of Cr18Mn18N steel forge piece and forge piece
CN106424497B (en) * 2016-12-27 2018-12-25 攀钢集团江油长城特殊钢有限公司 A kind of forging method and forging of Cr18Mn18N steel forge piece
CN106670360A (en) * 2016-12-30 2017-05-17 西南铝业(集团)有限责任公司 Ring piece rolling method
CN107282854A (en) * 2017-08-11 2017-10-24 烟台台海玛努尔核电设备有限公司 A kind of manufacturing process of nuclear power retaining ring
CN107282854B (en) * 2017-08-11 2019-07-02 烟台台海玛努尔核电设备有限公司 A kind of manufacturing process of nuclear power retaining ring
CN107913962A (en) * 2017-12-05 2018-04-17 燕山大学 Suppress the method for large forgings hot forging face checking
CN107913962B (en) * 2017-12-05 2019-05-28 燕山大学 Inhibit the method for large forgings hot forging face checking

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