CN104625388A - 具备防蚀片的蒸汽涡轮动叶片的制造方法 - Google Patents
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Abstract
本发明提供一种具备防蚀片的蒸汽涡轮动叶片的制造方法,其能够不格外准备背挡部件地将防蚀片防止烧穿地电子束焊接在蒸汽涡轮动叶片的前缘。将蒸汽涡轮动叶片、防蚀片、及隔片的任一个的原材料的一部分用作电子束焊接时的熔融金属的烧穿防止的背挡件,在电子束焊接后,利用机械加工还除去背挡件部分地成为最终的蒸汽涡轮动叶片的形状。
Description
技术领域
本发明涉及具备防蚀片的蒸汽涡轮动叶片的制造方法,尤其涉及通过焊接将防蚀片接合在蒸汽涡轮动叶片上而制造蒸汽涡轮动叶片的方法。
背景技术
在汽力蒸汽涡轮或原子力蒸汽涡轮中,为了防止在潮湿蒸汽中使用的蒸汽涡轮动叶片前缘部的侵蚀,如专利文献1~专利文献3所记载那样,在蒸汽涡轮动叶片前缘部的蒸汽流入侧,使隔片材料介于中间,利用TIG焊接(钨惰性气体焊接)或电子束焊接接合防蚀材料。
一般地,利用电子束的一层焊接的接合相对于原材料的种类或板厚,细致地调整加速电压、电子束电流、焊接速度、焦点距离等焊接条件,选定不会产生烧穿的最适条件进行施工。
现有技术文献
专利文献1:日本特开昭62-250124号公报
专利文献2:日本特开昭63-97802号公报
专利文献3:日本特开平5-23920号公报
近年来,伴随蒸汽涡轮的高效率化,涡轮动叶片的长叶片化、用于流动最适化的涡轮动叶片的立体形状化有所进展,防蚀材料的板厚变大。在对更厚的叶片材料与防蚀材料及隔片材料进行利用向下电子束焊接的一层焊接的情况下,与电子束贯通板厚同时,由于电子束的热而熔融的金属利用自重向下方流落,产生熔融金属的烧穿。随此产生焊珠表面的下旋在防蚀材料的接合中成为施工上的重大课题。
另外,在使用电子束的焊接中,作为对象的焊接物的厚度如果大,则需要相应地增大焊接电流值、即输出。另外,在低电压式电子束焊接机中,需要使施工电流值比高电压式电子束焊接机大。随着增大输出,电子束输出的偏差变大,用于以一层焊接的最适的焊接条件范围变窄。焊接电流的偏差成为由熔融金属的烧穿或融合不良引起的缺陷的原因,使用电子束焊接的一层焊接中的防蚀材料的接合极其困难。
在电子束焊接中,相对于施工时的烧穿,考虑在开槽形状的背侧设置挡板而防止烧穿的方法。但是,需要准备与被施工材料不同的背挡部件,产生背挡部件的准备费用,在制造成本方面具有缺陷。
发明内容
本发明的目的在于提供能够不格外准备背挡部件地将防蚀片防止烧穿地电子束焊接在蒸汽涡轮动叶片的前缘的具备防蚀片的蒸汽涡轮动叶片的制造方法。
本发明的具备防蚀片的蒸汽涡轮动叶片的制造方法将蒸汽涡轮动叶片、防蚀片及隔片的任一个原材料的一部分用作电子束焊接时的熔融金属的烧穿防止的背挡件,在电子束焊接后,利用机械加工除去背挡件部分,最终成为蒸汽涡轮动叶片的形状。
本发明的效果如下。
根据本发明,能够不格外准备背挡件地在蒸汽涡轮动叶片的前缘防止烧穿地对防蚀片进行电子束焊接。
上述以外的课题、结构及效果根据以下的实施方式的说明变得明确。
附图说明
图1(a)~(d)是说明本发明的实施例的防蚀材料的接合工序的流程的图。(实施例一)
图2(a)~(d)是说明本发明的另一实施例的防蚀材料的接合工序的流程的图。(实施例二)
图3(a)~(d)是说明本发明的又一实施例的防蚀材料的接合工序的流程的图。(实施例三)
图4是表示应用本发明的实施例的蒸汽涡轮动叶片的一例的蒸汽涡轮动叶片的整体图。
图中:1—涡轮动叶片的叶片部,2—防蚀片,3—隔片。
具体实施方式
下面,使用附图说明本发明的实施例。
图4表示应用本发明的实施例的蒸汽涡轮动叶片的一例的蒸汽涡轮动叶片的整体图。图4表示低压涡轮的蒸汽涡轮最终级动叶片。蒸汽涡轮动叶片具有叶片部1、护罩7、向转子的植入部8、设在叶片部的前端侧的前缘部(涡轮动叶片的蒸汽流入侧)的防蚀片2。后述的图1~图3表示图4的A-A剖面部。
实施例一
图1(a)~(d)表示本发明的实施例一的蒸汽涡轮动叶片的制造工序。表示蒸汽涡轮动叶片的前端部的前缘部。作为构成蒸汽涡轮动叶片的原材料,如图1(a)所示,由蒸汽涡轮动叶片的叶片部1、防蚀片2、配置在叶片部1与防蚀片2之间的隔片3构成。作为涡轮动叶片,使用Ti合金(例如包括A16%、V4%的Ti合金)、12Cr不锈钢等。作为防蚀片,在涡轮动叶片为Ti合金的情况下,使用防蚀性Ti合金(例如包括Mo15%、Zr5%、A13%的Ti合金),在涡轮动叶片为12Cr不锈钢的情况下,使用Co基合金。作为隔片,使用硬度比涡轮动叶片与防蚀片低的Ti制隔片或Ni基合金。
叶片部1、防蚀片2、隔片3如图1(b)所示那样组装。在本实施例中,电子束焊接时的烧穿防止机构设在隔片3上。即,作为设在电子束出口侧即开槽背面的烧穿防止机构利用隔片3的一部分。本实施例的隔片3的剖面为倒T字形。并且,叶片部1、防蚀片2、隔片3在与电子束的入射侧(图面上的上侧)相反的背面通过TIG焊接实施点焊焊接9,以使间隙最小而不会开口的方式安装。
之后,进行利用电子束焊接的一层焊接(图1(c))。电子束焊接在本实施例中,使用低电压式电子束焊接机,通过低电压式电子束焊接(例如60KW)进行叶片部1、防蚀片2、隔片3的一层焊接。此时,焊接金属部4利用由隔片3的一部分构成的烧穿防止机构防止烧穿。由此,能够扩大低电压式电子束焊接的电子束条件的裕度。
之后,包括烧穿防止机构部地利用机械加工除去,精加工为目标的动叶片形状(图1(d))。在该机械加工中,除去包括图1(c)中以符号10表示的部分地除去隔片3的烧穿防止机构。以符号10表示的部分的除去与用于流动最适化的涡轮动叶片的立体形状化对应地实施。该机械加工后,适当实施精加工。
在图1(d)所示的机械加工中,包括电子束焊接时的焊接前端地除去。在焊接前端容易形成气泡,但由于包括该部分地除去,因此确保焊接部的健全性。
根据本实施例,通过利用原材料(在本实施例中为隔片)起到背挡件功能,不需要格外准备背挡部件,能防止烧穿地利用低电压式电子束焊接的一层焊接将防蚀片接合在蒸汽涡轮动叶片的前缘(对作为目标的叶片材料的厚壁以一次焊接接合防蚀板)。因此,没有准备不同体的背挡部件的费用,能减少制造成本。特别地,在叶片部或防蚀片、隔片的板厚变大的情况下(当板厚变大时,容易产生烧穿),能容易地实施防蚀片的接合。因此,能使用电子束焊接制造设计为更长叶片化、复杂的立体形状的蒸汽涡轮动叶片。
另外,本实施例没有未焊接部分,因此,能得到强度优异的蒸汽涡轮动叶片。另外,由于叶片部1与防蚀片2双方的开槽形状为直线状,因此,还能得到容易形成开槽形状的效果。
实施例二
使用图2(a)~(d)说明本发明的实施例二。对与实施例一相同的部分省略说明。
在本实施例中,作为设在电子束出口侧即开槽背面的烧穿防止机构,利用叶片部1的原材料的一部分。在本实施例中,叶片部1的原材料的与防蚀片2的接合部形成为L字型。在叶片部1的L字型的突出部(底座)安装隔片3、防蚀片2。该L字型的突出部起到烧穿防止机构的作用。另外,与实施例一相同,在电子束焊接后,以还除去叶片部1的L字型突出部而成为目标的动叶片形状的方式实施机械加工。
即使在本实施例中,也能得到与实施例一相同的效果。
实施例三
使用图3(a)~(d)说明本发明的实施例三。对与实施例一相同的部分省略说明。
在本实施例中,作为设在电子束出口侧即开槽背面的烧穿防止机构,利用防蚀片2的原材料的一部分。在本实施例中,防蚀片2的原材料的与叶片部1的接合部形成为L字型。在叶片部1上安装隔片3、具有L字型突出部(底座)的防蚀片2。该L字型的突出部起到烧穿防止机构的作用。另外,与实施例一相同,在电子束焊接后,以还除去防蚀片2的L字型突出部而成为目标的动叶片形状的方式实施机械加工。
即使在本实施例中,也能得到与实施例一基本相同的效果。
另外,本发明未限定于上述实施例,包括多种变形例。例如,上述实施例是为了使本发明容易明白而详细地进行说明,并未限定于必须包括说明的全部的结构。另外,能将某实施例的结构的一部分置换为其他实施例的结构,并且,能在某实施例的结构上添加其他实施例的结构。另外,能对各实施例的一部分进行其他结构的追加、删除、置换。
Claims (5)
1.一种具备防蚀片的蒸汽涡轮动叶片的制造方法,其隔着隔片并利用电子束焊接将防蚀片连接在涡轮动叶片的前端部的叶片部的前缘侧,该具备防蚀片的蒸汽涡轮动叶片的制造方法的特征在于,
构成上述蒸汽涡轮动叶片的前端部的部件包括上述叶片部、上述隔片及上述防蚀片,
将构成电子束焊接前的上述蒸汽涡轮动叶片的前端部的部件的原材料的一部分用作电子束焊接时的熔融金属的烧穿防止的背挡件,
在电子束焊接后,利用机械加工还除去上述背挡部分地成为最终的蒸汽涡轮动叶片的形状。
2.一种具备防蚀片的蒸汽涡轮动叶片的制造方法,其利用电子束焊接将防蚀片连接在涡轮动叶片的前端部的前缘侧,该具备防蚀片的蒸汽涡轮动叶片的制造方法的特征在于,
将上述涡轮动叶片、上述防蚀片、电子束焊接时设置在上述涡轮动叶片与上述防蚀片之间的隔片的任一个的原材料的一部分用作电子束焊接时的熔融金属的烧穿防止的背挡件,
在电子束焊接后,利用机械加工还除去上述背挡件部分地成为最终的蒸汽涡轮动叶片的形状。
3.根据权利要求2所述的具备防蚀片的蒸汽涡轮动叶片的制造方法,其特征在于,
作为上述背挡件,利用上述隔片的原材料的一部分。
4.根据权利要求2所述的具备防蚀片的蒸汽涡轮动叶片的制造方法,其特征在于,
作为上述背挡件,利用上述涡轮动叶片的原材料的一部分。
5.根据权利要求2所述的具备防蚀片的蒸汽涡轮动叶片的制造方法,其特征在于,
作为上述背挡件,利用上述防蚀片的原材料的一部分。
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JP2013-234681 | 2013-11-13 | ||
JP2013234681A JP6178703B2 (ja) | 2013-11-13 | 2013-11-13 | 防食片を備えた蒸気タービン動翼の製造方法 |
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CN104625388A true CN104625388A (zh) | 2015-05-20 |
CN104625388B CN104625388B (zh) | 2017-12-15 |
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US (1) | US20160158875A1 (zh) |
EP (1) | EP2883651B1 (zh) |
JP (1) | JP6178703B2 (zh) |
CN (1) | CN104625388B (zh) |
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JP6100037B2 (ja) * | 2013-03-13 | 2017-03-22 | 三菱重工業株式会社 | 蒸気タービン翼製造方法 |
US10258837B2 (en) | 2014-02-18 | 2019-04-16 | Karsten Manufacturing Corporation | Method of forming golf club head assembly |
GB2550802B (en) * | 2015-02-17 | 2021-07-21 | Karsten Mfg Corp | Method of forming golf club head assembly |
CN113399795A (zh) * | 2021-07-14 | 2021-09-17 | 哈尔滨汽轮机厂有限责任公司 | 一种无需组焊静叶栅的汽轮机自带冠隔板装焊方法 |
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JPH0523920A (ja) * | 1991-07-19 | 1993-02-02 | Hitachi Ltd | タービン動翼の防食片接合方法 |
JPH07243302A (ja) * | 1994-03-03 | 1995-09-19 | Hitachi Ltd | 高エネルギビームによる送風機動翼の溶接継手 |
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US3874736A (en) * | 1972-12-27 | 1975-04-01 | Martin Marietta Aluminum | Welded vehicle wheel and method of producing same |
US4156123A (en) * | 1977-07-22 | 1979-05-22 | Smith International, Inc. | Method for making rock bits |
US4818629A (en) * | 1985-08-26 | 1989-04-04 | Fansteel Inc. | Joint construction for lined equipment |
JPS62250124A (ja) | 1986-04-23 | 1987-10-31 | Hitachi Ltd | Ti合金製タ−ビン動翼 |
JPS6397802A (ja) | 1986-10-13 | 1988-04-28 | Hitachi Ltd | Ti合金製タ−ビン動翼 |
GB8904988D0 (en) * | 1989-03-04 | 1989-04-19 | Refurbished Turbine Components | Turbine blade repair |
JP3481501B2 (ja) * | 1999-05-28 | 2003-12-22 | 株式会社日立製作所 | 構造体およびその製作方法 |
US6596411B2 (en) * | 2001-12-06 | 2003-07-22 | General Electric Company | High energy beam welding of single-crystal superalloys and assemblies formed thereby |
US7858897B2 (en) * | 2006-10-27 | 2010-12-28 | United Technologies Corporation | Insert weld repair |
US7591634B2 (en) * | 2006-11-21 | 2009-09-22 | General Electric Company | Stator shim welding |
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2013
- 2013-11-13 JP JP2013234681A patent/JP6178703B2/ja active Active
-
2014
- 2014-11-12 US US14/539,591 patent/US20160158875A1/en not_active Abandoned
- 2014-11-13 EP EP14192971.1A patent/EP2883651B1/en active Active
- 2014-11-13 CN CN201410641282.3A patent/CN104625388B/zh active Active
Patent Citations (6)
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JPS5431050A (en) * | 1977-08-11 | 1979-03-07 | Toshiba Corp | Corrosion prevention shielded welding method for turbine blade |
JPH0523920A (ja) * | 1991-07-19 | 1993-02-02 | Hitachi Ltd | タービン動翼の防食片接合方法 |
JPH07243302A (ja) * | 1994-03-03 | 1995-09-19 | Hitachi Ltd | 高エネルギビームによる送風機動翼の溶接継手 |
JPH09225652A (ja) * | 1996-02-20 | 1997-09-02 | Hitachi Ltd | 電子ビーム溶接継手 |
US6568077B1 (en) * | 2000-05-11 | 2003-05-27 | General Electric Company | Blisk weld repair |
US6709766B2 (en) * | 2000-10-02 | 2004-03-23 | The Boeing Company | Joining of structural members by welding |
Also Published As
Publication number | Publication date |
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JP2015094308A (ja) | 2015-05-18 |
JP6178703B2 (ja) | 2017-08-09 |
EP2883651B1 (en) | 2017-09-13 |
EP2883651A1 (en) | 2015-06-17 |
CN104625388B (zh) | 2017-12-15 |
US20160158875A1 (en) | 2016-06-09 |
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