US3680381A - Method of and apparatus for forming parts with re-entrant surfaces - Google Patents

Method of and apparatus for forming parts with re-entrant surfaces Download PDF

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Publication number
US3680381A
US3680381A US92045A US3680381DA US3680381A US 3680381 A US3680381 A US 3680381A US 92045 A US92045 A US 92045A US 3680381D A US3680381D A US 3680381DA US 3680381 A US3680381 A US 3680381A
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US
United States
Prior art keywords
arcuate
center
finish
forged
entrant
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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
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US92045A
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English (en)
Inventor
Pierre Portal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FORGES DE BOLOGNE SA
Sa Forges De Bologne
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FORGES DE BOLOGNE SA
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Publication date
Application filed by FORGES DE BOLOGNE SA filed Critical FORGES DE BOLOGNE SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
    • B21K3/04—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like blades, e.g. for turbines; Upsetting of blade roots
    • 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
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations

Definitions

  • the present invention relates to a method and apparatus for the finish forming of forged parts having reentrant surfaces.
  • Each blade comprises at least one lateral projection or other securing means by which it is secured respectively to the rim or to the hub of the rotor or stator, the projection comprising arcuate surfaces of which some are reentrant.
  • a method of forming a forged part with at least one reentrant surface on a projection thereof comprising the steps of confining a forged blank of the part in a space defining the final dimensions of a portion of the forged part, applying pressure to the projection of the blank to form said re-entrant surface, releasing said pressure, and removing the formed forged part from the space.
  • a method of finish forming an elongate forged part having a main portion and a lateral projection adjacent each end thereof, each said lateral projection having at least one laterally extending surface of arcuate form, the center of radius of which surfaces lies on the longitudinal axis of the part comprising the steps of confining a forged blank of the part in a space defining the final dimensions of the main portion of the part, said space being defined by mold parts movable towards and away from one another along an arcuate path the center of which coincides with the center of radius of the laterally extending arcuate surfaces, applying pressure endwise of the blank to form said projections with their arcuate surfaces, releasing said pressure, and moving the mold parts relatively to one another along said arcuate path whereby to release the elongate part in its final dimensions.
  • apparatus for finish forming a forged part having at least one re-entrant surface on at least one lateral projection thereof comprising two mold members, each having formed therein depressions corresponding to a portion of the finishforrned part, and at least one recess leading to that portion of the depression which defines the re-entrant surface, means pivotally connecting the mold members, a punch slidable in said recess to engage the projection and form the re-entrant surface, a fluid-operated actuator for operating the punch, and means for pivoting the mold parts about an axis containing the center of the arcuate surface whereby the finish formed part can be removed along a corresponding arcuate path.
  • the method in accordance with the invention enables the production from a rough blank made in accordance with known forging methods, a part with final dimensions.
  • the method in accordance with the invention enables, by avoiding machining the lateral projections, also obviates interrupting the flow lines in the grain of the metal at the juncture of the profile with the projections and thus to increase the fatigue stress limit of the vanes.
  • FIG. 1 is an elevation of a blank produced by forging and before forming in accordance with the present invention
  • FIG. 2 is a similar view of the part after forming
  • FIG. 3 is a partially sectioned perspective view of apparatus for forming a part in accordance with the invention.
  • FIG. 1 A blank is shown in FIG. 1 which comprises a blade 1 having an aerodynamic profiled main portion and two lateral projections 2, 3, or other securing means disposed at the ends of the blade I.
  • the projections 2, 3, comprise, respectively, two optional locating parts 4, 5 in order to facilitate centering of the blade as a whole.
  • the securing means 2, 3 produced by forging have surfaces 6, 7, 8, 9 which are only of tapered form, i.e., are not re-entrant.
  • the method in accordance with the invention enables the production of a finished part as shown in FIG. 2, in which arcuate surfaces 10 of radius R and center 0 as well as circular faces 11 of radius r and center 0 are of re-entrant form.
  • the apparatus for carrying out the method is shown in FIG. 3 and includes two forming members l2, l3 defining a space 14 in which the blank 1, shown in FIG. 1, is located.
  • the space 14 has a shape that is complementary to that of the final part, is open at its two ends and extends into recessed portions l5, 16 in which punches 17, 18 are displaceable under the action of pressure-fluid actuators, the pistons of which 19 and 20 are rigid with the said punches.
  • the forming member 12 is pivoted to the member 13 about the axis xx by means of pins 21 of which one only is shown in FIG. 3, the said axis xx, being coincident with the center 0 (FIG. 2) for facilitating the demolding operation.
  • the part I when disposed in the space 14 is held between the two forming members 12, 13 which are held together by locking means of any suitable form exerting a force acting in a direction as indicated by the arrow F, said punches l7, 18 being slidable as indicated by the arrows A and B, in the portions 15, 16 of the space 14 under the action of actuators 19 and 20.
  • the part I when disposed in the space 14 is held between the two forming members 12, 13 which are held together by locking means of any suitable form exerting a force acting in a direction as indicated by the arrow F, said punches l7, 18 being slidable as indicated by the arrows A and B, in the portions 15, 16 of the space 14 under the action of actuators 19 and 20.
  • projections 2 and 3 take up the form defined by the bottom of the portions 15, 16 of the space and the end faces of the punches 17, 18.
  • the punches 17, 18 are moved apart in directions opposite to the arrows A and B and the forming member 12 is pivoted about the axis xx, in order to free the part 1 from the member 13 likewise by an arcuate movement.
  • Apparatus for finish forming a forged part having at least one re-entrant surface on at least one lateral projection thereof comprising two mold members, each having formed therein depressions corresponding to a portion of the finish-formed part, and at least one recess leading to that portion of the depression which defines the re-entrant surface,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US92045A 1969-12-19 1970-11-23 Method of and apparatus for forming parts with re-entrant surfaces Expired - Lifetime US3680381A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6944249A FR2071194A5 (fr) 1969-12-19 1969-12-19

Publications (1)

Publication Number Publication Date
US3680381A true US3680381A (en) 1972-08-01

Family

ID=9044905

Family Applications (1)

Application Number Title Priority Date Filing Date
US92045A Expired - Lifetime US3680381A (en) 1969-12-19 1970-11-23 Method of and apparatus for forming parts with re-entrant surfaces

Country Status (6)

Country Link
US (1) US3680381A (fr)
BE (1) BE758732A (fr)
DE (1) DE2058176A1 (fr)
FR (1) FR2071194A5 (fr)
GB (1) GB1319093A (fr)
SU (1) SU489288A3 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023389A (en) * 1976-06-16 1977-05-17 Rockwell International Corporation Method of flow forming
US4321818A (en) * 1979-10-03 1982-03-30 Kawaski Yukon Kabushiki Kaisha Closed forging press
US4571977A (en) * 1981-09-22 1986-02-25 Hitachi, Ltd. Method of forging flanged shaft
US6453556B1 (en) * 2000-10-11 2002-09-24 Hmy Ltd. Method of producing exhaust gas vane blade for superchargers of motor vehicles and vane blade
US20040250712A1 (en) * 2002-12-31 2004-12-16 Tippey Darold D. Process of packaging a compressible article
US20050235723A1 (en) * 2004-04-26 2005-10-27 Shun-Lung Chang Conveyor chain pin forming facility
US20060248936A1 (en) * 2003-07-22 2006-11-09 Katsuaki Nakamura Metal molding method and machine, and metal molded body
US20070277579A1 (en) * 2004-02-12 2007-12-06 Trygve Ruste Method And Tool For Closed Die Forging
US20080184765A1 (en) * 2007-02-02 2008-08-07 Miao Jiahua Closed forging die and forging method
US20090044591A1 (en) * 2003-07-31 2009-02-19 Showa Denko K.K. Forging method, forged product and forging apparatus
US20090223271A1 (en) * 2005-11-15 2009-09-10 Showa Denko K.K. Swaging method and swaging apparatus
JP2019209376A (ja) * 2018-05-31 2019-12-12 株式会社関プレス 突起部形成方法、突起部形成システム、及び突起部を有する金属部品の製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910943A (en) * 1930-04-29 1933-05-23 Wiberg Oscar Anton Method of manufacturing turbine blades
US2751667A (en) * 1950-05-15 1956-06-26 Smith Corp A O Method of forming center sections for hollow propeller blades

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1910943A (en) * 1930-04-29 1933-05-23 Wiberg Oscar Anton Method of manufacturing turbine blades
US2751667A (en) * 1950-05-15 1956-06-26 Smith Corp A O Method of forming center sections for hollow propeller blades

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023389A (en) * 1976-06-16 1977-05-17 Rockwell International Corporation Method of flow forming
US4321818A (en) * 1979-10-03 1982-03-30 Kawaski Yukon Kabushiki Kaisha Closed forging press
US4571977A (en) * 1981-09-22 1986-02-25 Hitachi, Ltd. Method of forging flanged shaft
US6453556B1 (en) * 2000-10-11 2002-09-24 Hmy Ltd. Method of producing exhaust gas vane blade for superchargers of motor vehicles and vane blade
US20040250712A1 (en) * 2002-12-31 2004-12-16 Tippey Darold D. Process of packaging a compressible article
US20060248936A1 (en) * 2003-07-22 2006-11-09 Katsuaki Nakamura Metal molding method and machine, and metal molded body
US7389668B2 (en) * 2003-07-22 2008-06-24 Rinascimetalli Ltd. Metal molding method and machine, and metal molded body
US20090044591A1 (en) * 2003-07-31 2009-02-19 Showa Denko K.K. Forging method, forged product and forging apparatus
US7681428B2 (en) * 2003-07-31 2010-03-23 Showa Denko K.K. Forging method, forged product and forging apparatus
US20070277579A1 (en) * 2004-02-12 2007-12-06 Trygve Ruste Method And Tool For Closed Die Forging
US20050235723A1 (en) * 2004-04-26 2005-10-27 Shun-Lung Chang Conveyor chain pin forming facility
US20090223271A1 (en) * 2005-11-15 2009-09-10 Showa Denko K.K. Swaging method and swaging apparatus
US20080184765A1 (en) * 2007-02-02 2008-08-07 Miao Jiahua Closed forging die and forging method
US7900493B2 (en) * 2007-02-02 2011-03-08 Ntn Corporation Closed forging die and forging method
JP2019209376A (ja) * 2018-05-31 2019-12-12 株式会社関プレス 突起部形成方法、突起部形成システム、及び突起部を有する金属部品の製造方法

Also Published As

Publication number Publication date
GB1319093A (en) 1973-05-31
SU489288A3 (ru) 1975-10-25
FR2071194A5 (fr) 1971-09-17
BE758732A (fr) 1971-04-16
DE2058176A1 (de) 1971-06-24

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