US2660779A - Method of forming blade roots - Google Patents

Method of forming blade roots Download PDF

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Publication number
US2660779A
US2660779A US70723A US7072349A US2660779A US 2660779 A US2660779 A US 2660779A US 70723 A US70723 A US 70723A US 7072349 A US7072349 A US 7072349A US 2660779 A US2660779 A US 2660779A
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US
United States
Prior art keywords
blades
blade roots
forming blade
root
roots
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US70723A
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English (en)
Inventor
Atkinson Joseph
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Individual
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Individual
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Publication date
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Publication of US2660779A publication Critical patent/US2660779A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/16—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons turbine blades; compressor blades; propeller blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/02—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine or like blades from one piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49336—Blade making

Definitions

  • This invention relates to an improved method for forming the root or anchor portion of the blades used in bladed fluid-flow machines such as turbines and compressors, and relates particularly to blades of the type'which areformed with a profiled root adapted to be secured in a socket (hereinafter referred to as blades of the type described).
  • the invention is mainly of interest in connection with the production of blades which are subjected in use to high temperatures and stresses, and which therefore require to be made of specially developed steels or alloys, such as nickel-chrome alloys, which may be diilicult and expensive to machine.
  • blades which are subjected in use to high temperatures and stresses, and which therefore require to be made of specially developed steels or alloys, such as nickel-chrome alloys, which may be diilicult and expensive to machine.
  • E'xamplesof such blades are the turbine rotor blades of gas turbine ,machines, and in a lesser degree the compressor rotor blades (in cases where bladed compressors of the axial flow type are used).
  • One known method of securing the blades to the turbine rotor disc of a gas turbine is to provide the periphery of the rotor disc with serrated slots extending in a generally radial direction, complementary serrations being formed on the blade roots so that they can be pressed into the slots and secured, for instance by peeping.
  • serrated blade root, and the corresponding slot are tapered
  • such a method of blade mounting is generally known in the art (from the profile of the blade root) as the firtree mounting, and it will be hereinafter designated by this term. At present fir-tree mountings are in wide use.
  • Fir-tree roots have hitherto been usually made by a machining operation, such as broaching, and one object of the present invention is to provide an alternative method of making such roots which eliminates or reduces machining operations, thus cheapening production, and which, at least in the case of some materials, also has a beneficial effect on the material treated.
  • the invention provides, for blades of the type described, the method of forming the root contour wholly or partly by means of pressure-working.
  • pressure-working is meant a rolling, swaging, stamping, coining or similar operation.
  • the pressure working may most advantageously comprise a rolling operation, which will usually be cold, but may be hot if the nature of the material which is being worked requires it.
  • the rolls may be of any suitable material, such as hardened steel or tungsten carbide.
  • Fig. .1 is a front elevation of the movable ram carrying the rolls
  • Fig. 2 is a transverse section through the ram, showing the stationary table in which the blades are fixed
  • Fig. 3 is a side elevation of the ram. 7
  • Fig. 4 is a side e1evati0n
  • Fig. 5 is a fragmentary plan, of an alternative rolling machine in which the blades are fed linearly through the rolls.
  • Figs. 6 and '7 are detail views ofmo'dified types of roll.
  • the machine there shown comprises in essentials a vertically movable ram I, in which three slides 2 are mounted for horizontal sliding movement. Each slide is resiliently biassed to a central position by a spring-pressed ball or plunger device 3, and the slide can move against such spring pressure in

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Metal Rolling (AREA)
US70723A 1948-01-15 1949-01-13 Method of forming blade roots Expired - Lifetime US2660779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1277/48A GB648783A (en) 1948-01-15 1948-01-15 Improvements in or related to turbine, compressor and like blades

Publications (1)

Publication Number Publication Date
US2660779A true US2660779A (en) 1953-12-01

Family

ID=9719165

Family Applications (1)

Application Number Title Priority Date Filing Date
US70723A Expired - Lifetime US2660779A (en) 1948-01-15 1949-01-13 Method of forming blade roots

Country Status (7)

Country Link
US (1) US2660779A (en(2012))
BE (1) BE486831A (en(2012))
CH (1) CH275521A (en(2012))
DK (1) DK77501C (en(2012))
FR (1) FR979187A (en(2012))
GB (1) GB648783A (en(2012))
NL (1) NL73860C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002264A (en) * 1953-06-08 1961-10-03 Power Jets Res & Dev Ltd Process for making turbine or compressor blades
US4888863A (en) * 1988-03-21 1989-12-26 Westinghouse Electric Corp. Method and apparatus for producing turbine blade roots
US20110008172A1 (en) * 2009-07-10 2011-01-13 Jette Sylvain Process and apparatus for providing firtree slots
US20200088040A1 (en) * 2018-09-14 2020-03-19 United Technologies Corporation Wrought Root Blade Manufacture Methods
CN115091140A (zh) * 2022-07-15 2022-09-23 广东鸿图南通压铸有限公司 一种新能源汽车铝合金齿轮盒的加工方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178673B (de) * 1955-03-31 1964-09-24 Bbc Brown Boveri & Cie Verfahren zur Herstellung von Schaufeln fuer axial durchstroemte Turbomaschinen, ins-besondere Gasturbinen
US4057475A (en) * 1976-06-28 1977-11-08 Trw Inc. Method of forming a plurality of articles

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US77111A (en) * 1868-04-21 Improved mode of suefaodtq sheet-ibon and metal plates
US353116A (en) * 1886-11-23 Machine for rolling rods of metal
US622475A (en) * 1899-04-04 Machine for threading screws
US648031A (en) * 1899-12-04 1900-04-24 Edward William Mackenzie-Hughes Manufacture of axle-boxes.
US690088A (en) * 1901-03-25 1901-12-31 George T Warwick Machine for screw-threading, heading, and elongating metallic rods.
US1040398A (en) * 1909-01-19 1912-10-08 East Jersey Pipe Company Machine for upsetting metal plates.
US1516556A (en) * 1922-11-21 1924-11-25 Gen Electric Method of manufacturing turbine blades
US1647920A (en) * 1924-06-23 1927-11-01 Leitner Henry Manufacture of screw propellers
US2254629A (en) * 1939-09-26 1941-09-02 Westinghouse Electric & Mfg Co Method of manufacturing turbine blades

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US77111A (en) * 1868-04-21 Improved mode of suefaodtq sheet-ibon and metal plates
US353116A (en) * 1886-11-23 Machine for rolling rods of metal
US622475A (en) * 1899-04-04 Machine for threading screws
US648031A (en) * 1899-12-04 1900-04-24 Edward William Mackenzie-Hughes Manufacture of axle-boxes.
US690088A (en) * 1901-03-25 1901-12-31 George T Warwick Machine for screw-threading, heading, and elongating metallic rods.
US1040398A (en) * 1909-01-19 1912-10-08 East Jersey Pipe Company Machine for upsetting metal plates.
US1516556A (en) * 1922-11-21 1924-11-25 Gen Electric Method of manufacturing turbine blades
US1647920A (en) * 1924-06-23 1927-11-01 Leitner Henry Manufacture of screw propellers
US2254629A (en) * 1939-09-26 1941-09-02 Westinghouse Electric & Mfg Co Method of manufacturing turbine blades

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002264A (en) * 1953-06-08 1961-10-03 Power Jets Res & Dev Ltd Process for making turbine or compressor blades
US4888863A (en) * 1988-03-21 1989-12-26 Westinghouse Electric Corp. Method and apparatus for producing turbine blade roots
US20110008172A1 (en) * 2009-07-10 2011-01-13 Jette Sylvain Process and apparatus for providing firtree slots
US8567059B2 (en) 2009-07-10 2013-10-29 Pratt & Whitney Canada Corp. Process for forming a firtree slot in a disc of a rotor of a gas turbine engine
US9296053B2 (en) 2009-07-10 2016-03-29 Pratt & Whitney Canada Corp. Apparatus for providing firtree slots
US20200088040A1 (en) * 2018-09-14 2020-03-19 United Technologies Corporation Wrought Root Blade Manufacture Methods
US11306595B2 (en) * 2018-09-14 2022-04-19 Raytheon Technologies Corporation Wrought root blade manufacture methods
US11773724B2 (en) 2018-09-14 2023-10-03 Rtx Corporation Wrought root blade manufacture methods
CN115091140A (zh) * 2022-07-15 2022-09-23 广东鸿图南通压铸有限公司 一种新能源汽车铝合金齿轮盒的加工方法

Also Published As

Publication number Publication date
GB648783A (en) 1951-01-10
FR979187A (fr) 1951-04-23
CH275521A (de) 1951-05-31
BE486831A (en(2012)) 1949-01-31
NL73860C (nl) 1954-01-15
DK77501C (da) 1954-05-03

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