US20170297080A1 - Ring molded article manufacturing method - Google Patents

Ring molded article manufacturing method Download PDF

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Publication number
US20170297080A1
US20170297080A1 US15/507,610 US201515507610A US2017297080A1 US 20170297080 A1 US20170297080 A1 US 20170297080A1 US 201515507610 A US201515507610 A US 201515507610A US 2017297080 A1 US2017297080 A1 US 2017297080A1
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United States
Prior art keywords
ring
article
molded article
center axis
forging
Prior art date
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Abandoned
Application number
US15/507,610
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English (en)
Inventor
Yuji Ishiwari
Jun Ohsone
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.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Hitachi Metals MMC Superalloy Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd, Hitachi Metals MMC Superalloy Ltd filed Critical Hitachi Metals Ltd
Publication of US20170297080A1 publication Critical patent/US20170297080A1/en
Assigned to HITACHI METALS, LTD., HITACHI METALS MMC SUPERALLOY, LTD reassignment HITACHI METALS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIWARI, YUJI, OHSONE, JUN
Assigned to HITACHI METALS, LTD. reassignment HITACHI METALS, LTD. MERGER AND CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI METALS MMC SUPERALLOY, LTD., HITACHI METALS, LTD.
Abandoned 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
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B5/00—Extending closed shapes of metal bands by rolling
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • 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
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/32—Making machine elements wheels; discs discs, e.g. disc wheels
    • 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
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
    • 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
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • 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
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/06—Shaping thick-walled hollow articles, e.g. projectiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/25—Manufacture essentially without removing material by forging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/26—Manufacture essentially without removing material by rolling

Definitions

  • the present invention relates to a ring molded article manufacturing, method is which forging is used.
  • a plurality of turbine disks are arranged side by side such that their center axes are positioned along one another, and a plurality of turbine blades are attached to each turbine disk so as to be apart from one another in a direction of a circumference of each turbine disk.
  • high-temperature and high-pressure combustion gas which is generated inside the engine, flows in a direction of the center axes from a front stage side of the turbine disks toward a rear stage side thereof, on peripheral portions of the turbine disks, and thus, the turbine disks, together with the turbine blades, rotate at a high speed around their center axes.
  • the driving force generated by this rotation is transmitted to a compressor and fans which are located on the front stage side of the turbine disks in the direction of the center axes, and compressed air necessary for continuous combustion of the gas and propulsion are thus obtained.
  • a turbine disk is produced by an operation in which a molding article formed in a substantially ring-like shape (hereinafter referred to as a “ring molded article”), is subjected to cutting or the like.
  • a ring molded article typically, convex portions respectively protrude on both sides of the ring molded article in a direction of a center axis thereof, and furthermore, the convex portions extend in a direction of a circumference of the ring molded article.
  • An outer periphery of the turbine disk is exposed to combustion gas, and a temperature thereat becomes as high as approximately 600 degrees C. to 700 degrees C. Meanwhile, a temperature at an inner periphery thereof is lower than that at the outer periphery. Thermal stress is generated in an inside of this turbine disk because the engine is repeatedly started and stopped. Therefore, it is desired for the turbine disk to have excellent low cycle fatigue characteristics. Furthermore, centrifugal force is applied to the outer periphery of the turbine disk according to a high-speed rotation around the axis thereof at high temperatures. Therefore, it is desired for the turbine disk to further have a high creep strength characteristic. In addition, it is desired for the turbine disk to have a high tensile strength and a high yield strength. Therefore, it is desired for the ring molded article used in the turbine disks, to have a sufficiently high mechanical strength appropriate for the above desires.
  • a ring molded article manufacturing method the following is performed to secure mechanical strengths of a ring molded article.
  • a cylindrical billet is processed by first forging so as to be pressed by two molds from a direction of a center axis of the billet, and a first forged article which is formed in a disc-like shape, is thus produced.
  • the first forged article is drilled such that a through hole in an axial direction of the forged article is formed, and a drilled article is thus produced.
  • the drilled article is processed by ring rolling, and a material which is formed in a substantially ring-like shape (hereinafter referred to as a “ring material”), is thus produced.
  • ring material a material which is formed in a substantially ring-like shape
  • the ring material is placed inside the two molds on which concave portions corresponding to the convex portions of the ring molded article are formed respectively, and the ring material is then subjected to second forging so as to be sandwiched and pressed between the two molds.
  • the ring material in the form of fluid fills in the concave portions of the two molds to form the convex portions of the ring molded article, and the ring molded article is thus obtained (for example, see Patent Literatures 1 and 2).
  • the crystal grains which form the ring molded article are thus refined, and thereby, mechanical strengths, such as a tensile strength and a fatigue strength, can be in particular improved.
  • a hydraulic-control forging press machine which can strictly control a speed of the forging, has often been used.
  • the ring molded articles produced by the example of the above manufacturing method have often been used for producing large turbine disks.
  • Patent Literature 1 JP S52-131967 A
  • Patent Literature 2 JP 2011-079043 A
  • the second forging process it becomes difficult to impart strain to a surface region of the ring material which is in contact with the molds, particularly in an initial stage of the second forging, because the material adheres to the molds. Furthermore, in the second forging process, a temperature of the surface region of the ring material which is in contact with the molds, is decreased in comparison with a temperature of a central region of the ring material according to influence from heat release to the mold which is primarily made of a metal.
  • a region of the ring molded article corresponding to the surface region which is in contact with the mold particularly at the initial stage of the second forging may have a rough structure in comparison with the structure of the central region of the ring molded article, and thus, it becomes difficult for this region to obtain desired mechanical characteristics.
  • the above region is known as a “dead metal” region. It is desired to avoid this dead metal remaining in a region of the ring molded article which is used as a turbine disk (hereinafter referred to as a “turbine disk region”). To prevent the turbine disk region from including the dead metal region, an excess portion of the ring molded article is previously provided such that a thickness thereof is increased, and the excess portion is then removed by a cutting after the second forging.
  • the ring material which is placed inside the two molds, is in contact with an entirety of regions which range from an opening of the concave portion of the mold to both inner peripheral and outer peripheral sides of the concave portion, respectively.
  • a temperature in a wide range of the surface region of the ring material may easily decrease, and thus, the dead metal regions may be increased in the ring molded article which is produced in the above manner.
  • the present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a ring molded article manufacturing method capable of reliably and efficiently producing a ring molded article in which dead metal regions are reduced.
  • the method includes a step of performing first forging on a material such that the material is formed in a shape including a bottom which is formed in a disk shape, and a peripheral wall which is inclined to a direction from a center of the bottom toward an outer periphery thereof, in a direction from an outer periphery of the bottom toward one side in a direction of a center axis of the bottom, a step of drilling the bottom of a first forged article obtained by the step of performing the first forging, a step of ring-rolling a drilled article obtained by the step of drilling, and a step of producing a ring molded article in which a ring material obtained by the step of ring-rolling, is placed inside two molds, the ring material is then processed by second forging so as to be pressed by the two molds in a direction of a center axis of the ring material, and the ring molded molded
  • the ring molded article in which dead metal regions are reduced can be reliably and efficiently produced.
  • FIG. 1 is a plan view schematically showing a ring molded article which is produced by a manufacturing method according to a First Embodiment of the present invention.
  • FIG. 2 is a half sectional view of the ring molded article which is produced by the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 3 is a flow chart for explaining the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 4 is a full sectional view schematically showing a billet to be subjected to rough forging in the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 5 is a plan view schematically showing a rough-forged article made by rough forging in the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 6 is a full sectional view schematically showing a drilled article made by a drilling process in the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 7 is a diagram for explaining ring rolling in the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 8( a ) is a half sectional view schematically showing a condition of arrangement of a ring-rolled article immediately before start of finishing forging in the manufacturing method according to the First Embodiment of the present invention.
  • FIG. 8( b ) is a half sectional view schematically showing a condition immediately after the finishing forging is completed.
  • FIG. 9 is a half sectional view schematically showing the ring-rolled article of FIG. 8( a ) .
  • a ring molded article produced by a manufacturing method according to the First Embodiment of the present invention will be described below.
  • a ring molded article is used for producing a turbine disk in an engine for an aircraft or the like. Furthermore, the turbine disk is produced by an operation in which a ring molded article after molding is processed by heat treatment, an operation in which an excess portion of a ring molded article is removed, and the like.
  • a ring molded article is made of metals, and in the present Embodiment, a ring molded article is produced of Ni-base alloy718.
  • the present invention is not limited to this. More specifically, any metal which enables manufacturing of a ring molded article having high strength at high temperatures, can be used.
  • a ring molded article may be produced by using a Ni-base alloy, a Fe-base alloy, a Co-base alloy, or the like which has high strength at high temperatures.
  • the ring molded article includes a base portion 1 b which is formed in a substantially ring-like shape around a center axis 1 a thereof.
  • the ring molded article 1 includes a one side convex portion 1 c and an another side convex portion 1 d which protrude from the base portion 1 b on both sides of the ring molded article 1 in a center axis direction thereof, respectively.
  • the two convex portions 1 c and 1 d are formed so as to extend in a direction of a circumference of the ring molded article 1 . Note that in FIG.
  • the one side convex portion 1 c and the another side convex portion 1 d of the ring molded article 1 substantially coincide with each other in a radial direction of the ring molded article 1 .
  • the one side convex portion 1 c and the another side convex portion 1 d of the ring molded article 1 can be offset relative to each other in the radial direction of the ring molded article 1 .
  • a billet 2 (shown in FIG. 4 ) is subjected to rough forging as first forging, and thus, a rough-forged article 3 (shown in FIG. 5 ) is produced as a first forged article (Rough forging step S 1 ).
  • the rough-forged article 3 is processed by drilling so that a drilled article 4 is made (shown in FIG. 6 ).
  • the drilled article 4 may be further processed by intermediate ring rolling if necessary (drilling step S 2 ).
  • the drilled article 4 is ring-rolled so that a ring-rolled article 5 (shown in FIGS.
  • the ring-rolled article 5 is processed by finish forging as second forging so that the above ring molded article 1 configured as a second forged article, is made (finishing forging step S 4 ).
  • the billet 2 formed in a substantially cylindrical shape around a center axis 2 a as a material to be processed by rough forging is produced by using Ni-base alloy718, and then, the billet 2 is pressed by using molds and the like so that the rough-forged article 3 shown in FIG. 5 is produced.
  • a heating temperature for the billet 2 used in the rough forging step S 1 be in a range of 900 degrees C. to 1075 degrees C.
  • the present invention is not limited to this. More specifically, if the billet 2 is to be produced by using a metal other than Ni-base alloy718, the heating temperature may be set so as to be adapted to rough forging which is performed on the above billet.
  • the rough-forged article 3 is formed so as to include a bottom 3 b which is formed in a substantially disc-like shape around a center axis 3 a, and a peripheral wall 3 c which is inclined to a direction from a center of the bottom 3 b to an outer periphery thereof, in a direction from the center of the bottom 3 b to one side of a center axis direction of the bottom 3 b.
  • a broken line indicates a boundary between the bottom 3 b and the peripheral wall 3 c. In the drilling process described below, the bottom 3 b is removed along the broken line.
  • a straight line 3 i which passes through a center of gravity 3 g of the one side region 3 e and a center of gravity 3 h of the another side region 3 f , is inclined by an angle • 1 relative to a parallel line 3 j which is in parallel with the center axis 3 a of the rough-forged article 3 , i.e., relative to the center axis 3 a of the rough-forged article 3 .
  • the angle • 1 be in a range which is 7 degrees to 40 degrees.
  • the rough-forged article 3 is processed by drilling, such as punching out with press working, cutting with a water cutter, or the like, such that the bottom 3 b of the rough-forged article 3 shown in FIG. 5 is removed.
  • the drilled article 4 including a through hole 4 b which is formed along a center axis 4 a is produced as shown in FIG. 6 .
  • the drilled article 4 includes a peripheral wall 4 c corresponding to the peripheral wall 3 c of the rough-forged article 3 . If necessary, the drilled article 4 may be processed by intermediate ring rolling.
  • the ring rolling step S 3 will be described below.
  • a ring rolling apparatus 11 shown in FIG. 7 is used.
  • the ring rolling apparatus 11 includes a main roll 12 which is located on an outer periphery side of the drilled article 4 , and a mandrel roll 13 which is located on an inner periphery side of the drilled article 4 .
  • the outer peripheral surface of the main roll 12 and that of the mandrel roll 13 face each other.
  • the main roll 12 is configured so as to be rotatable around a rotational axis 12 a which passes through a center of the main roll 12 and extends substantially parallel with the center axis 4 a of the drilled article 4 .
  • the outer peripheral surface of the main roll 12 is inclined so as to correspond to an outer peripheral surface of the ring-rolled article 5 to be produced.
  • the mandrel roll 13 is also configured so as to be rotatable around a rotational axis 13 a which passes through the center of the mandrel roll 13 and extends substantially in parallel with the center axis 4 a of the drilled article 4 .
  • the outer peripheral surface of the mandrel roll 13 is inclined so as to correspond to an inner peripheral surface of the ring-rolled article 5 to be produced.
  • the present invention is not limited to this.
  • the main roll and the mandrel roll may be formed in a substantially cylindrical shape and the rotational axis of the main roll and the mandrel roll may be respectively arranged so as to be inclined in correspondence with the outer peripheral surface and the inner peripheral surface in the ring-rolled article 5 to be produced.
  • the ring rolling apparatus 11 includes a pair of axial rolls 14 , 15 located on both sides of the drilled article 4 in a center axis direction thereof. An outer peripheral surface of the axial roll 14 and that of the axial roll 15 face each other.
  • Each of the axial rolls 14 , 15 is configured so as to be rotatable around a rotational axis 14 a, 15 a which passes through the center of the corresponding axial roll.
  • the drilled article 4 is charged into the ring rolling apparatus 11 .
  • a heating temperature for the drilled article 4 to be charged into the ring rolling apparatus 11 be in a range of 900 degrees C. to 1050 degrees C.
  • the present invention is not limited to this. More specifically, if the drilled article 4 is to be produced by using a metal other than Ni-base alloy718, the heating temperature may be set so as to be adapted to ring rolling performed on the above drilled article 4 .
  • the outer peripheral surface of the main roll 12 is brought into contact with the outer peripheral surface of the drilled article 4
  • the outer peripheral surface of the mandrel roll 13 is brought into contact with the inner peripheral surface of the drilled article 4
  • the outer peripheral surfaces of the axial roll pair 14 , 15 are respectively brought into contact with both surfaces of the drilled article 4 in the center axis direction thereof.
  • the main roll 12 and the mandrel roll 13 are turned around the rotational axis 12 a, 13 a, respectively, the main roll 12 and the mandrel roll 13 sandwich and press the drilled article 4 in a radial direction of the drilled article 4 .
  • the ring-rolled article 5 is formed so as to be shaped in a substantially ring-like shape around a center axis 5 a of the ring-rolled article 5 , and a half section of the ring-rolled article 5 is formed so as to be inclined. More specifically, as shown in FIG.
  • a straight line 5 g which passes through a center of gravity 5 e of the one side region 5 e and a center of gravity 5 g of the another side region 5 d, is inclined by an angle • 2 relative to a parallel line 5 h which is in parallel with the center axis 5 a of the ring-rolled article 5 , i.e.
  • the angle • 2 be in a range of 7 degrees to 40 degrees. Furthermore, it is more preferable that the angle • 2 be in a range of 10 degrees to 25 degrees. This is because if the angle • 2 is in the above range, sufficient amount of strain can be imparted to the material in the finishing forging step S 4 described below so that the material may be appropriate, particularly as a material for aircraft turbine disks.
  • the angle • 2 in the one half section of the ring-rolled article 5 may be either the same as or different from the angle • 1 in the one half section of the peripheral wall 3 c of the rough-forged article 3 . If the angle • 2 is different from the angle • 1 , the drilled article 4 may be ring-rolled: such that the above angle is changed.
  • the outer peripheral surface of the ring-rolled article 5 may be formed in a substantially arc-like shape which protrudes from the inner periphery of the ring-rolled article 5 toward the outer periphery thereof.
  • the outer peripheral surface of the main roll 12 may be formed in a substantially arc-like shape which recesses from the inner periphery of the ring-rolled article 5 toward outer periphery thereof so as to correspond to the outer peripheral surface of the ring-rolled article 5 .
  • the inner peripheral surface of the ring-rolled article 5 may be formed in a substantially arc-like shape which protrudes from the outer periphery of the ring-rolled article 5 to the inner periphery thereof. Furthermore, to form the inner peripheral surface of the ring-rolled article 5 which is formed in the above-described substantially arc-like shape, the outer peripheral surface of the mandrel roll 13 may be formed in a substantially arc-like shape which recesses from the outer periphery of the ring-rolled article 5 to the inner periphery thereof so as to correspond to the inner peripheral surface of the ring-rolled article 5 .
  • the finishing forging step S 4 will be described below.
  • a one side mold 16 and an another side mold 17 shown in FIGS. 8( a ) and 8( b ) , are used.
  • the one side mold 16 includes a concave portion 16 a which corresponds to the one side convex portion 1 c of the ring molded article 1 , and an opening side concave portion 16 b which corresponds to the one side region in the base portion 1 b of the ring molded article 1 .
  • the another side mold 17 includes a concave portion 17 a which corresponds to the another side convex portion 1 d of the ring molded article 1 , and an opening side concave portion 17 b which corresponds to the another side region of the base portion 1 b of the ring molded article 1 .
  • the ring-rolled article 5 is placed in the above two molds 16 , 17 , and then, the ring-rolled article 5 is sandwiched and pressed by the two molds 16 , 17 in a center axis division of the ring-rolled article 5 .
  • a heating temperature for the ring-rolled article 5 placed in the two molds 16 , 17 be in a range of 900 degrees C. to 1050 degrees C.
  • the present invention is not limited to this. More specifically, if the ring-rolled article 5 is produced of a metal other than Ni-base alloy718, the heating temperature may be set to a temperature adapted to the finishing forging performed on the ring-rolled article 5 .
  • the ring-rolled article 5 is supported by a region which is located on the outer peripheral side from an outer peripheral side corner 16 c in a concave portion 16 a of the one side mold 16 (this region will be hereafter be referred to as an “outer peripheral side supporting region”), and a region which is located on the inner peripheral side from an inner peripheral side corner 17 c in a concave portion 17 a of the another side mold 17 (this region will he hereafter referred to as an “inner peripheral side supporting region”)
  • the above expression “outer peripheral side corner 16 c in the concave portion 16 a ” indicates a corner located between an outer peripheral surface 16 a 1 in the concave portion 16 a of the one side mold 16 and an outer peripheral side bottom surface 16 b 1 in the opening side concave portion 16 b thereof
  • the above expression “inner peripheral side corner 17 c in the concave portion 17 a ” indicates a corner located between an inner peripheral surface 17
  • the ring-rolled article 5 be arranged so as to be apart from regions other than the outer peripheral side supporting region of the one side mold 16 and the inner peripheral side supporting region of the another side mold 17 .
  • both ends of the ring-rolled article 5 in a direction of the inclined straight line 5 g are in contact with the two molds 16 , 17 , respectively, and the ring-rolled article 5 is restricted by the two molds 16 , 17 in the center axis direction of the ring-rolled article 5 and in the radial direction of the ring-rolled article 5 .
  • the ring-rolled article 5 is supported by the outer periphery side bottom surface 16 b 1 and the outer peripheral surface 16 b 2 in the opening side concave portion 16 b of the one side mold 16 and the inner peripheral side bottom surface 17 b 1 and the inner peripheral surface 17 b 2 in the opening side concave portion 17 b of the another side mold 17 .
  • the ring-rolled article be arranged so as to be apart from regions other than the outer periphery side bottom surface 16 b 1 and the outer peripheral surface 16 b 2 in the opening side concave portion 16 b of the one side mold 16 and the inner peripheral side bottom surface 17 b 1 and the inner peripheral surface 17 b 2 in the opening side concave portion 17 b of the another side mold 17 .
  • the ring-rolled article 5 in the form of fluid fills the concave portion 16 a and the opening side concave portion 16 b of the one side mold 16 and the concave portion 17 a and the opening side concave portion 17 b of the another side mold 17 .
  • the ring molded article 1 is produced.
  • the billet 2 is processed by the rough forging so as to be formed in a shape including the bottom 3 b which is farmed in the substantially cylindrical shape, and the peripheral wall 3 c which is inclined to the direction from the center of the bottom 3 b toward the outer periphery thereof, in the direction from the outer periphery of the bottom 3 b toward the one side in the direction of the center axis of the bottom 3 b, the rough-forged article 3 is thus produced, and the bottom 3 b of the rough-forged article 3 is drilled.
  • the ring-rolled article 5 is placed in the two molds 16 , 17 on which the concave portions 16 a, 17 a respectively corresponding to the convex portions 1 c, 1 d of the ring molded article 1 , the ring-rolled article 5 is then processed by the finishing forging so that the ring-rolled article 5 is pressed by the two molds 16 , 17 in the direction of the center axis of the ring-rolled article 5 , and the ring molded article 1 is thus produced.
  • the finishing forging step S 4 when placing the ring-rolled article 5 in the two molds 16 , 17 , the ring-rolled article 5 is supported by the outer periphery side supporting region of the one side mold 16 and the inner peripheral side supporting region of the another side mold 17 , and furthermore, the ring-rolled article 5 is arranged so as to be apart from the regions other than the outer periphery side supporting region of the one side mold 16 and the inner peripheral side supporting region of the other side mold 17 .
  • An outer peripheral shape of the rough-forged article 3 is tapered from a top thereof to the bottom 3 b thereof, and dimension area of the bottom 3 b can be reduced.
  • the finishing forging step S 4 the contact area between the ring-rolled article 5 and the two molds 16 , 17 can be reduced, and as a result, regions that the material of the ring-rolled article 5 adhere to the two molds 16 , 17 , can be reduced at the start of the finishing forging and the initial stage of the finishing forging, and thus, sufficient strain can be imparted to the ring molded article 1 to be produced.
  • the temperature of the surface regions of the ring-rolled article 5 is reduced according to heat release to the two molds 16 , 17 , and thus, it can be prevented that crystals of metal structure in the surface regions of the produced ring molded article 1 is coarsened. Accordingly, the ring molded article 1 in which dead metal regions are reduced, can be reliably and efficiently produced. In addition, the excess portions of the ring molded article 1 which is provided in correspondence with the dead metal regions, can be reduced, and thus, near-net-shape forging can be implemented.
  • the ring-rolled article 5 in the form of fluid securely fills into the concave portions 16 a, 17 a of the two melds 16 , 17 , and thus, the two convex portions 1 c, 1 d of the ring molded article 1 can be securely formed.
  • the inclination angle • 1 of the one half section of the peripheral wall 3 e is within the range of 7 degrees to 40 degrees. Accordingly, since the inclination angle • 1 is 7 degrees or more, in the finishing forging step S 4 , buckling of the ring-rolled article 5 can be prevented.
  • the size of the rough-forged article 3 can be reduced, and furthermore, in the finishing forging step S 4 , a phenomenon in which a desired shape cannot be obtained according to unstable finishing forging caused by turning of the ring-rolled article 5 (this phenomenon will hereafter be referred to as “phenomenon of turning of the ring-rolled article 5 ”), can be prevented. Accordingly, the ring molded article 1 in which the dead metal regions are reduced, can be reliably and efficiently produced.
  • the inclination angle • 2 of the ring-rolled article 5 which is placed in the two molds 16 , 17 is within the range of 7 degrees to 40 degrees, at the start of the finishing forging and the initial stage of the finishing forging. Accordingly, since the inclination angle • 2 is 7 degrees or more, in the finishing forging step S 4 , buckling of the ring-rolled article 5 can be prevented. Furthermore, since the inclination angle • 2 is 40 degrees or less, the phenomenon of turning of the ring-rolled article 5 can be prevented. Accordingly, the ring molded article 1 in which the dead metal regions are reduced, can be reliably and efficiently produced.
  • a method for manufacturing a ring molded article according to a Second Embodiment of the present invention will be described.
  • Basic features of the ring material used for manufacturing the ring molded article according to the present Embodiment are substantially the same as those of the First Embodiment described above.
  • the method for manufacturing the ring molded article according to the present Embodiment is different from the method of the First Embodiment in the following.
  • a recess section is formed so as to correspond to the outer peripheral side corner of the concave portion in the one side mold.
  • the recess section may be formed by machine working, such as cutting, press working, or the like, after the ring rolling.
  • this ring-rolled article is supported by the outer peripheral side corner in the concave portion of the one side mold which engages the recess section, and also supported by the inner peripheral side bottom surface and the inner peripheral surface in the opening side concave portion of the another side mold.
  • the ring-rolled article be arranged so as to be apart from regions other than the outer peripheral side corner in the concave portion of the one side mold and the inner peripheral side bottom surface and the inner peripheral surface in the opening side concave portion of the another side mold.
  • the following advantageous effects can be obtained. That is to say, since the recess section of the ring-rolled article engages the outer peripheral side corner in the concave portion of the one side mold, the ring-rolled article can be stably supported inside the two molds. Accordingly, the ring-rolled article in which the dead metal regions are reduced can be reliably and efficiently produced.
  • a method for manufacturing a ring molded article according to a Third Embodiment of the present invention will be described. Basic features of the method for manufacturing the ring molded article are substantially the same as those of the First Embodiment described above. However, the method for manufacturing the ring molded article according to the present Embodiment is different from the method of the First Embodiment in the following.
  • recess sections are formed which respectively correspond to an outer peripheral side corner in the concave portion of the one side mold and to an inner peripheral side corner in the concave portion of the another side mold.
  • the recess sections may be formed by machine working, such as cutting, press working, or the like, after the ring rolling.
  • this ring-rolled article is supported by the outer peripheral side corner in the concave portion of the one side mold which engages the corresponding recess section of the two recess sections, and also supported by the inner peripheral side corner in the concave portion of the another side mold.
  • the ring-rolled article be arranged so as to be apart from regions other than the outer peripheral side corner in the concave portion of the one side mold and the inner peripheral side corner in the opening side concave portion of the another side mold.
  • the following advantageous effects can be obtained. That is to say, since the recess sections of the ring-rolled article engage the outer peripheral side corner in the concave potions of the one side mold and the inner peripheral side corner in the concave potions of the another side mold respectively, the ring-rolled article can be stably supported inside the two molds. Accordingly, the ring-rolled article in which the dead metal regions are reduced can be reliably and efficiently produced.
  • Embodiments of the present invention are as described above; however, the present invention is not limited to them. More specifically, the present invention can be implemented by various modifications and alterations based on the technical idea of the present invention.
  • the following feature may be employed. That is to say, in this feature, if the concave portions 16 a, 17 a of the two molds 16 , 17 which are used in the finishing forging step S 4 , are offset in the radial direction of the ring molded article 1 so as to correspond to the one side convex portion 1 c and the another side convex portion 1 d in the ring molded article 1 which are offset in the radial direction, the ring-rolled article 5 can be supported in a condition in which the one half section of the ring-rolled article 5 is not inclined, i.e., in a condition in which the inclination angle • 2 for the one half section is 0 degrees.
  • the one half section of the ring-rolled article 5 may be formed in a substantially rectangular shape, and furthermore, an amount of offset between the concave portions 16 a, 17 a of the two molds 16 , 17 in the radial direction of the ring-rolled article 5 may be less than a thickness of the one side surface in the radial direction of the ring-rolled article 5 .
  • the ring-rolled article 5 can be supported by the outer peripheral side supporting region of the one side mold 16 and the inner peripheral side sup porting region of the another side mold 17 . If the above feature is employed, the forging can be implemented such that the phenomenon of dead metal is suppressed. However, in view of stable arrangement of the ring-rolled article 5 and freedom of shape of the ring-rolled article 5 , it is preferable to employ the feature in which the one half section of the ring-rolled article is inclined.
  • the ring molded article 1 to be produced has dimensions with a maximum outer diameter of 1090 mm, a maximum thickness in the radial direction of 120 mm, and a maximum height in the direction of the center axis of 110 mm.
  • the finishing forging step S 4 used for producing this ring molded article 1 the finishing forging step S 4 is performed in a plurality of arrangement conditions, respectively, in which the inclination angle • 2 for the inclined one half section of the ring-rolled article 5 is set at 5 degrees, 7 degrees, 10 degrees, 20 degrees, 25 degrees, 30 degrees, 40 degrees, 45 degrees, or 50 degrees.
  • the forging step for each arrangement condition it is examined whether buckling of the ring-rolled article 5 occurs.
  • the forging step for each arrangement condition it is examined whether the phenomenon of turning of the ring-rolled article 5 occurs.
  • the ring molded article 1 in which strain appropriate for applying to a material of aircraft turbine disks is sufficiently imparted and the dead metal regions are reduced can be more reliably and more efficiently produced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forging (AREA)
US15/507,610 2014-09-01 2015-08-27 Ring molded article manufacturing method Abandoned US20170297080A1 (en)

Applications Claiming Priority (3)

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JP2014-177026 2014-09-01
JP2014177026 2014-09-01
PCT/JP2015/074182 WO2016035664A1 (ja) 2014-09-01 2015-08-27 リング成形体の製造方法

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US (1) US20170297080A1 (de)
EP (1) EP3189910B1 (de)
JP (1) JP5895111B1 (de)
CN (1) CN107206469B (de)
MX (1) MX2017002421A (de)
RU (1) RU2667112C2 (de)
WO (1) WO2016035664A1 (de)

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CN112338114A (zh) * 2020-10-26 2021-02-09 伊莱特能源装备股份有限公司 一种内孔倾斜环件成型工艺
CN112892406A (zh) * 2021-01-20 2021-06-04 常州朱美拉模具技术有限公司 一种环模颗粒机用环模生产制造工艺
CN113751647A (zh) * 2021-08-25 2021-12-07 第一拖拉机股份有限公司 一种模锻制坯的闭式卡压模具及闭式卡压制坯方法
US20230043008A1 (en) * 2019-12-25 2023-02-09 Hitachi Metals, Ltd. Method of manufacturing ring-rolled element

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CN108435998A (zh) * 2018-02-28 2018-08-24 武汉理工大学 一种环件复合制坯热轧成形方法
CN113579130B (zh) * 2021-07-29 2022-07-22 武汉理工大学 带外岛屿凸台的异型薄壁机匣环锻件轧制方法

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Publication number Priority date Publication date Assignee Title
US20230043008A1 (en) * 2019-12-25 2023-02-09 Hitachi Metals, Ltd. Method of manufacturing ring-rolled element
CN112338114A (zh) * 2020-10-26 2021-02-09 伊莱特能源装备股份有限公司 一种内孔倾斜环件成型工艺
CN112892406A (zh) * 2021-01-20 2021-06-04 常州朱美拉模具技术有限公司 一种环模颗粒机用环模生产制造工艺
CN113751647A (zh) * 2021-08-25 2021-12-07 第一拖拉机股份有限公司 一种模锻制坯的闭式卡压模具及闭式卡压制坯方法

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RU2017106320A3 (de) 2018-08-28
WO2016035664A1 (ja) 2016-03-10
EP3189910A1 (de) 2017-07-12
RU2017106320A (ru) 2018-08-28
RU2667112C2 (ru) 2018-09-14
JP5895111B1 (ja) 2016-03-30
EP3189910B1 (de) 2021-10-13
JPWO2016035664A1 (ja) 2017-04-27
CN107206469B (zh) 2019-04-02
MX2017002421A (es) 2017-08-02
CN107206469A (zh) 2017-09-26
EP3189910A4 (de) 2018-04-25

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