CN1931496A - Wire electrode cutting process of steam turbine blade - Google Patents
Wire electrode cutting process of steam turbine blade Download PDFInfo
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- CN1931496A CN1931496A CN 200610140964 CN200610140964A CN1931496A CN 1931496 A CN1931496 A CN 1931496A CN 200610140964 CN200610140964 CN 200610140964 CN 200610140964 A CN200610140964 A CN 200610140964A CN 1931496 A CN1931496 A CN 1931496A
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Abstract
The present invention discloses wire electrode cutting process of steam turbine blade. The cutting process includes wire electrode cutting the static blade of steam turbine blank of circular forged steel and grinding with grinding belt or polishing; and wire electrode cutting the die forged moving blade blank and grinding with grinding belt or flat grinding.
Description
Technical field
The present invention relates to a kind of wire cutting technology method of turbine blade.
Background technology
Steam turbine (comprising power station steam turbine, industrial steam turbine, flue gas turbine expander etc.) is widely used in modern people economy, and is very important.Blade is the cardiac component of steam turbine, its complex structure, and manufacture difficulty is bigger.The working environment of blade and stressing conditions are very complicated.Therefore, the quality of the workmanship of blade (comprising inherent quality, surface quality and assembly quality etc.) will directly have influence on the efficient of steam turbine running and the manufacturing cycle of reliability and steam turbine.
The blade of steam turbine is various in style.The material of blade generally adopts 1Cr13,2Cr13,1Cr11MoV, 0Cr17Ni4Cu4Nb etc., the structure of blade generally is made up of steam passage (interior convex profile) and assembling (comprising that blade root, Ye Ding, moving vane also have manufactured head, shroud, lacing hole or boss etc.) two parts.Various blades generally can be divided into stator blade and moving vane two big classes.Stator blade can be divided into the uiform section prismatic blade by its steam passage cross section partly and variable cross-section twists two kinds of stator blades.The leaf and root structure of blade is by " ZBK54020-88 steam turbine blade root and tolerance thereof " standard, and T type, double-T shaped, dual forked type, three forked types, four forked types, fir-tree type etc. are generally arranged.
The present situation of turbine Blade Machining technology is at present:
According to the designing requirement of blade, according to the blade blank situation that is adopted normally adopt car, mill, traditional handicraft method such as plane, mill, pincers, its each position is processed respectively.
The processing of blade steam passage
When blade blank adopted square steel or forging part, the traditional handicraft of blade steam passage profile processing generally was: roughing (dig, general mill or is shaped mill etc.), fine finishining (copy milling, shapings milled, numerical control is milled etc.), pincers are repaiied, rubbing down, essence throwing (felt throwing, abrasive band mill, vibration finishing etc.)
Assembled portion processing
No matter adopt which kind of blank, the fitting surface of blade and non-fitting surface adopt usually and the traditional handicraft method such as generally mill, moulding is milled, numerical control is milled, brute force grind, and warp slightly, fine finishining forms.The forked type of blade, T type blade root are generally adopted production miller processing, and general employing is rough milled the back finish-milling or rough milled the back mill or adopt the brute force mill directly to grind to fir-tree root.
The defective of blade processing technique present situation is at present:
1, material use rate variance
At present the blank of turbine blade be generally square steel or forging part (the single-sided process surplus 〉=3mm), allowance is big, adopts existing its stock utilization of traditional handicraft processing blade lower, is generally table 1,
| The blank form | Moving vane | Stator blade |
| Billet | 10％-15％ | 15％-20％ |
| Forging part | 20％-35％ | 30％-40％ |
If adopt wire cutting technology to add man-hour, its stock utilization is generally table 2,
| The blank form | Moving vane | Stator blade | |
| Uiform section | The distortion cross section | ||
| Side or round steel | 15％-25％ | 70％-80％ | 60％-70％ |
| Forging part | 35％-40％ | 40％-60％ | 40％-60％ |
2, technical process is long, and process quality is difficult to control
If when adopting traditional handicraft method processing blade, its technical process is longer, operation is more, and workpiece is through operation (station) repeatedly, and repeatedly positioning and clamping causes mismachining tolerance easily.
3, technological equipment investment is big, and the blade manufacturing cycle is long
Blade is the vital part of steam turbine, and blade production generally is to belong to many kinds, small lot batch manufacture mode, and the amount of labour of blade manufacturing accounts for 1/3rd of steam turbine usually.If adopt traditional handicraft processing its manufacturing cycle of blade longer.The cycle of its manufacturing of a kind of blade new product of general exploitation reached more than half a year.In addition, if adopt conventional machining process, the required equipment investment of manufactory is bigger, and this is difficult to realize for general small business.
Summary of the invention
The technical issues that need to address of the present invention just are a kind of breakthrough to the turbine blade conventional machining process, a kind of wire cutting technology method of turbine blade is provided, it has increased a kind of new tool to the processing and manufacturing of turbine blade, and further improve stock utilization, reduce equipment investment, the stable prod crudy shortens the production cycle, strengthen the development ability of blade new product, to adapt to the needs of market economy.
For addressing the above problem, the present invention adopts following technical scheme:
The wire cutting technology method of a kind of turbine blade of the present invention, described processing method is that the blank of steam turbine stator blade adopts the circular guiding principle of forging, and stator blade (uiform section stator blade/variable cross-section distortion stator blade) warp cutting, one-shot forming be abrasive band mill or rubbing down method then; The moving vane blank adopts forging part.The blade root processing of blade, warp cutting one-shot forming, abrasive band mill or plain grinding method.
The technological method for processing of uiform section stator blade of the present invention is: blade blank is the circular forged steel after Overheating Treatment, after pressing the length blanking of product technological requirement, there is the technologist to utilize CAD to seek best layout scheme and programming, then with blank (circular forged steel) on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade.The diameter of line cutting molybdenum filament is generally selected for use about φ 0.18mm.Clout piece after the line cutting processing also can be used for being processed into other products.Therefore, adopt wire cutting technology processing blade can improve stock utilization to greatest extent, and crudy is more stable.
Blade warp cutting processing is after smart the throwing or abrasive band mill or vibration finishing aftershaping.
The processing method of variable cross-section distortion stator blade of the present invention is: the vertical vertical projection method that at first adopts blade, that finds out minimum can contain the cross section profile in each cross section of blade steam passage fully, blade blank adopts the circular forged steel after Overheating Treatment then, after pressing the length blanking of product technological requirement, there is the technologist to utilize CAD to seek best layout scheme and programming, then with blank (circular forged steel) on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade.The diameter of line cutting molybdenum filament is generally selected for use about φ 0.18mm.Clout piece after the line cutting processing also can be used for being processed into other products.Like this, it is the highest to reach the blade blank stock utilization, most economical processing purpose, and the workpiece after the line cutting is thrown (going surplus processing in case of necessity through the part) through essence and is become the blade finished product.
The processing method of moving vane of the present invention is: the blank of moving vane is generally forging part, processing its blade root (T type, forked type, fir-tree type) one-shot forming through adjusting also behind the clamping on the linear cutting equipment, leave the mill surplus (abrasive band mill or plain grinding) of 0.1-0.15mm, then wire cutting technology processing blade rivet hole, integral shroud and blade length overall etc. are adopted in the blade root location to process.Repair and form the blade finished product through rubbing down, pincers then.The clout piece that line cuts down also can be used to make other products.Therefore, adopt wire cutting technology not only can reduce operation, and raw material can be fully used good economy performance.
Linear cutting equipment technological parameter of the present invention is as follows: electric current is 2-3A, being chosen as of power tube: the height of workpiece is selected 5-6 power tube during less than 100mm; The workpiece height is selected 7-10 power tube between 100-200mm the time; The workpiece height is selected 10 above power tubes when 200mm is above; Current pulse width is: the height of workpiece is selected below the 32 μ s during less than 100mm; The workpiece height is selected 64 μ s between 100-200mm the time; The workpiece height is selected between the 64-128 μ s when 200mm is above; In theory, pulse width is big more, and working (machining) efficiency is high more, and the big more workpiece roughness of circuit is big more.Being chosen as of discharging gap: the height of workpiece is selected less than 5 during less than 100mm; The workpiece height is selected 5-7 between 100-200mm the time; Usually the big more electric current of discharging gap is more little, and cutting efficiency is low more.The workpiece height is selected more than 7 when 200mm is above; Machining voltage is: the height of workpiece is selected about 60V during less than 100mm; The workpiece height is selected 60-70V between 100-200mm the time; The workpiece height is selected more than the 70V when 200mm is above; Normally high cutting efficiency is high more more for voltage, and fineness is poor more.The molybdenum filament consume is big more.The workpiece feed speed requires steadily evenly.
The present invention changes blank into circular forged steel with square steel according to concrete blade construction, and raw material can be made full use of to greatest extent, good economy performance.When adopting the blade root of wire cutting technology processing stator blade steam passage or moving vane, workpiece only need once be adjusted the cutting of clamping warp and finish, and leaf quality is more stable.If adopting wire cutting technology processing its manufacturing cycle of blade generally only is 1-3 month.Be processed as example with stator blade, adopt the required equipment investment of traditional handicraft method processing to be about to adopt wire cutting technology several times even more.
In sum, the present invention is a kind of breakthrough to the turbine blade conventional machining process, and a kind of turbine blade wire cutting technology method is provided, for the processing and manufacturing of turbine blade has increased a kind of new tool.And further improve stock utilization, and reducing equipment investment, the stable prod crudy shortens the production cycle, strengthens the development ability of blade new product, to adapt to the needs of market economy.
The specific embodiment
The wire cutting technology method of a kind of turbine blade of the present invention, described technological method for processing is that the blank of steam turbine stator blade adopts circular forged steel, and stator blade (uiform section stator blade/variable cross-section distortion stator blade) warp cutting, one-shot forming are after abrasive band mill or rubbing down method; The moving vane blank adopts forging part.Blade root processing warp cutting one-shot forming, abrasive band mill or the plain grinding method of blade.
The technological method for processing of uiform section stator blade of the present invention is: blade blank is the circular forged steel after Overheating Treatment, after pressing the length blanking of product technological requirement, there is the technologist to utilize CAD to seek best layout scheme and programming, then with blank (circular forged steel) on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade.The diameter of line cutting molybdenum filament is generally selected for use about φ 0.18mm.Clout piece after the line cutting processing also can be used for being processed into other products.Therefore, adopt wire cutting technology processing blade can improve stock utilization to greatest extent, and crudy is more stable.
Blade warp cutting processing is after smart the throwing or abrasive band mill or vibration finishing aftershaping.
The processing technology of variable cross-section distortion stator blade of the present invention is: the vertical vertical projection method that at first adopts blade, that finds out minimum can contain the cross section profile in each cross section of blade steam passage fully, blade blank adopts the circular forged steel after Overheating Treatment then, after pressing the length blanking of product technological requirement, there is the technologist to utilize CAD to seek best layout scheme and programming, then with blank (circular forged steel) on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade.The diameter of line cutting molybdenum filament is generally selected for use about φ 0.18mm.Clout piece after the line cutting processing also can be used for being processed into other products.Like this, it is the highest to reach the blade blank stock utilization, most economical processing purpose, and the workpiece after the line cutting is thrown (going surplus processing in case of necessity through the part) through essence and is become the blade finished product.
The technological method for processing of moving vane of the present invention is: the blank of moving vane is generally forging part, processing its blade root (T type, forked type, fir-tree type) one-shot forming through adjusting also behind the clamping on the linear cutting equipment, the mill surplus (abrasive band mill or plain grinding) that 0.1-0.15mm is arranged, then wire cutting technology processing blade rivet hole, integral shroud and blade length overall etc. are adopted in the blade root location to process.Repair and form the blade finished product through rubbing down, pincers then.The clout piece that line cuts down also can be used to make other products.Therefore, adopt wire cutting technology not only can reduce operation, and raw material can be fully used good economy performance.
Linear cutting equipment technological parameter of the present invention is as follows: electric current is 2-3A, being chosen as of power tube: the height of workpiece is selected 5-6 power tube during less than 100mm; The workpiece height is selected 7-10 power tube between 100-200mm the time; The workpiece height is selected 10 above power tubes when 200mm is above; Current pulse width is: the height of workpiece is selected below the 32 μ s during less than 100mm; The workpiece height is selected 64 μ s between 100-200mm the time; The workpiece height is selected between the 64-128 μ s when 200mm is above; In theory, pulse width is big more, and working (machining) efficiency is high more, and the big more workpiece roughness of circuit is big more.Being chosen as of discharging gap: the height of workpiece is selected less than 5 during less than 100mm; The workpiece height is selected 5-7 between 100-200mm the time; Usually the big more electric current of discharging gap is more little, and cutting efficiency is low more.The workpiece height is selected more than 7 when 200mm is above; Machining voltage is: the height of workpiece is selected about 60V during less than 100mm; The workpiece height is selected 60-70V between 100-200mm the time; The workpiece height is selected more than the 70V when 200mm is above; Normally high cutting efficiency is high more more for voltage, and fineness is poor more.The molybdenum filament consume is big more.The workpiece feed speed requires steadily evenly.
| The frequency conversion state | The feeding state | The machined surface situation | Cutting speed | Adjust |
| Cross tracking | Slow and steady | Slightly burnt | Low | Slow down |
| Owe to follow the tracks of | Neglect suddenly inhomogeneous soon slowly | Not bright and cleanly easily go out gash | Comparatively fast | Accelerate |
| Not good enough tracking | Slow and steady | Burned black | Low | Fast slightly |
| The best tracking | Very steady | It is bright and clean to turn white | Hurry up | Uncomfortable |
According to the requirement of the structure and the processing technology of blade product, select suitable linear cutting equipment, for example: DK7732 type electric spark CNC wire-cut machine etc.
The present invention is not limited to above-mentioned preferred forms, and other any identical with the present invention or akin products that anyone draws under enlightenment of the present invention all drop within protection scope of the present invention.
Claims (5)
1, a kind of wire cutting technology method of turbine blade, it is characterized in that: described technological method for processing is that the blank of steam turbine stator blade adopts circular forged steel, and stator blade (uiform section stator blade/variable cross-section distortion stator blade) warp cutting, one-shot forming are after the method for abrasive band mill or rubbing down; The moving vane blank adopts the method for blade root processing warp cutting one-shot forming, abrasive band mill or the plain grinding of forging part, blade.
2. the wire cutting technology method of turbine blade as claimed in claim 1, it is characterized in that: the technological method for processing of described uiform section stator blade is: blade blank is the circular forged steel after Overheating Treatment, after pressing the length blanking of product technological requirement, then with blank on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade; The diameter of line cutting molybdenum filament is φ 0.16-0.20mm, and the clout piece after the line cutting processing also can be used for being processed into other products; Blade warp cutting processing is after smart the throwing or abrasive band mill or vibration finishing aftershaping.
3, the wire cutting technology method of turbine blade as claimed in claim 1, it is characterized in that: the technological method for processing of described variable cross-section distortion stator blade is: the vertical vertical projection method that at first adopts blade, that finds out minimum can contain the cross section profile in each cross section of blade steam passage fully, blade blank is the circular forged steel after Overheating Treatment, after pressing the cross section profile blanking, then with blank (circular forged steel) on linear cutting equipment through once adjusting, behind the clamping, just can realize processing continuously the multi-disc blade; The diameter of line cutting molybdenum filament is φ 0.16-0.20mm, and the clout piece after the line cutting processing also can be used for being processed into other products; Workpiece after the line cutting is thrown into the blade finished product through essence.
4, the wire cutting technology method of turbine blade as claimed in claim 1, it is characterized in that: the processing technology of described moving vane is: the blank of moving vane is generally forging part, processing its blade root (T type, forked type, fir-tree type) one-shot forming through adjusting also behind the clamping on the linear cutting equipment, the mill surplus that 0.1-0.15mm is arranged, then locate with the blade root that processes, adopt wire cutting method processing blade rivet hole, integral shroud and blade length overall, repair and form the blade finished product through rubbing down, pincers then; The clout piece that line cuts down also can be used to make other products.
5, as the wire cutting technology method of arbitrary described turbine blade of claim 1-4, it is characterized in that: according to the requirement of the specification and the processing technology of blade product, select suitable linear cutting equipment for use, for example DK7732 type electric spark CNC wire-cut machine etc.Described linear cutting equipment technological parameter is as follows: electric current is 2-3A, being chosen as of power tube: the height of workpiece is selected 5-6 power tube during less than 100mm; The workpiece height is selected 7-10 power tube between 100-200mm the time; The workpiece height is selected 10 above power tubes when 200mm is above; Current pulse width is: the height of workpiece is selected below the 32 μ s during less than 100mm; The workpiece height is selected 64 μ s between 100-200mm the time; The workpiece height is selected between the 64-128 μ s when 200mm is above; Being chosen as of discharging gap: the height of workpiece is selected less than 5 during less than 100mm; The workpiece height is selected 5-7 between 100-200mm the time; The workpiece height is selected more than 7 when 200mm is above; Machining voltage is: the height of workpiece is selected about 60V during less than 100mm; The workpiece height is selected 60-70V between 100-200mm the time; The workpiece height is selected more than the 70V when 200mm is above; The workpiece feed speed requires steadily evenly.
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| CNB2006101409641A CN100450686C (en) | 2006-10-19 | 2006-10-19 | Wire electrode cutting process of steam turbine blade |
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| CNB2006101409641A CN100450686C (en) | 2006-10-19 | 2006-10-19 | Wire electrode cutting process of steam turbine blade |
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| CN100450686C CN100450686C (en) | 2009-01-14 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102096391A (en) * | 2010-12-08 | 2011-06-15 | 西安交通大学 | Cutter path generating method for double blade head processing of turbine long blade profile |
| CN103157765A (en) * | 2011-12-16 | 2013-06-19 | 洛阳奇润电力科技有限公司 | Resin sand cast fully-polishing forming device of stator blades of large turbine |
| CN105171158A (en) * | 2015-10-10 | 2015-12-23 | 贵阳中航动力精密铸造有限公司 | Technology for machining conical gas film holes of turbine guide blade |
| CN105773150A (en) * | 2016-05-23 | 2016-07-20 | 山西卡每特工业机械有限公司 | Machining device for high-temperature blade |
| CN105798557A (en) * | 2016-05-23 | 2016-07-27 | 山西卡每特工业机械有限公司 | High-temperature blade machining method |
| CN107774852A (en) * | 2017-11-30 | 2018-03-09 | 无锡透平叶片有限公司 | A kind of compressor blade forging process for fuel forming method |
| CN110732761A (en) * | 2019-11-01 | 2020-01-31 | 中国神华能源股份有限公司国华电力分公司 | Last stage blade on-line cutting method of steam turbine |
| CN112207524A (en) * | 2020-08-26 | 2021-01-12 | 成都市新美加机械设备制造有限公司 | Small blade processing technology |
| CN115213503A (en) * | 2022-09-20 | 2022-10-21 | 扬州市职业大学(扬州开放大学) | Wire cutting equipment with grinding process |
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| SE518806C2 (en) * | 2001-03-14 | 2002-11-26 | Volvo Aero Corp | Method and apparatus for producing a stator or rotor component |
| KR20040009437A (en) * | 2002-07-23 | 2004-01-31 | 현대모비스 주식회사 | Method of manufacturing turbine blade using symmetrically electric discharge method for turbo pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096391A (en) * | 2010-12-08 | 2011-06-15 | 西安交通大学 | Cutter path generating method for double blade head processing of turbine long blade profile |
| CN102096391B (en) * | 2010-12-08 | 2012-09-05 | 西安交通大学 | Cutter path generating method for double blade head processing of turbine long blade profile |
| CN103157765A (en) * | 2011-12-16 | 2013-06-19 | 洛阳奇润电力科技有限公司 | Resin sand cast fully-polishing forming device of stator blades of large turbine |
| CN105171158A (en) * | 2015-10-10 | 2015-12-23 | 贵阳中航动力精密铸造有限公司 | Technology for machining conical gas film holes of turbine guide blade |
| CN105773150A (en) * | 2016-05-23 | 2016-07-20 | 山西卡每特工业机械有限公司 | Machining device for high-temperature blade |
| CN105798557A (en) * | 2016-05-23 | 2016-07-27 | 山西卡每特工业机械有限公司 | High-temperature blade machining method |
| CN107774852A (en) * | 2017-11-30 | 2018-03-09 | 无锡透平叶片有限公司 | A kind of compressor blade forging process for fuel forming method |
| CN110732761A (en) * | 2019-11-01 | 2020-01-31 | 中国神华能源股份有限公司国华电力分公司 | Last stage blade on-line cutting method of steam turbine |
| CN112207524A (en) * | 2020-08-26 | 2021-01-12 | 成都市新美加机械设备制造有限公司 | Small blade processing technology |
| CN115213503A (en) * | 2022-09-20 | 2022-10-21 | 扬州市职业大学(扬州开放大学) | Wire cutting equipment with grinding process |
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Assignee: Wuxi Yanggong Machinery Manufacturing Co., Ltd. Assignor: Yang Longxing Contract fulfillment period: 2009.4.1 to 2026.10.18 contract change Contract record no.: 2009320000552 Denomination of invention: Wire electrode cutting process of steam turbine blade Granted publication date: 20090114 License type: Exclusive license Record date: 2009.4.7 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.4.1 TO 2026.10.18; CHANGE OF CONTRACT Name of requester: WUXI YANGGONG MACHINERY MANUFACTURING CO., LTD. Effective date: 20090407 |