WO2013065780A1 - 穿孔装置、穿孔装置に用いられるプラグ及び継目無鋼管の製造方法 - Google Patents
穿孔装置、穿孔装置に用いられるプラグ及び継目無鋼管の製造方法 Download PDFInfo
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- WO2013065780A1 WO2013065780A1 PCT/JP2012/078315 JP2012078315W WO2013065780A1 WO 2013065780 A1 WO2013065780 A1 WO 2013065780A1 JP 2012078315 W JP2012078315 W JP 2012078315W WO 2013065780 A1 WO2013065780 A1 WO 2013065780A1
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- Prior art keywords
- plug
- billet
- hole
- tip
- perforating apparatus
- Prior art date
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- 238000000034 method Methods 0.000 title description 19
- 238000004519 manufacturing process Methods 0.000 title description 10
- 229910000831 Steel Inorganic materials 0.000 title description 8
- 239000010959 steel Substances 0.000 title description 8
- 238000005096 rolling process Methods 0.000 claims description 34
- 238000005553 drilling Methods 0.000 claims description 23
- 238000004080 punching Methods 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000007547 defect Effects 0.000 description 37
- 230000004323 axial length Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 239000002184 metal Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002436 steel type Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 102200082816 rs34868397 Human genes 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000000669 biting effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/04—Piercing presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
Definitions
- the present invention relates to a drilling device, a plug used for the drilling device, and a method for manufacturing a seamless steel pipe.
- the piercing device for piercing the billet for example, there are a tilt rolling type piercing machine, a press roll type piercing machine, and a piercing press.
- the inclined rolling type drilling machine is used for the production of seamless steel pipes by the Mannesmann method.
- the tilt rolling type punching machine manufactures a hollow shell by punching and rolling a round billet.
- the inclined rolling type drilling machine includes, for example, a pair of inclined rolls and a plug. Each of the pair of inclined rolls is inclined with respect to the pass line. The plug is disposed between the pair of inclined rolls and on the pass line.
- Inclined rolling type piercing machines a round billet is pushed into a plug while rotating in a circumferential direction by an inclined roll, and the round billet is pierced and rolled into a hollow shell.
- inner surface flaws When a round billet is pierced and rolled into a hollow shell by an inclined rolling type piercer, wrinkles (hereinafter referred to as inner surface flaws) may occur on the inner surface of the hollow shell.
- the inner surface flaw is generated by the following mechanism. During piercing and rolling, Mannesmann fracture occurs in the round billet, and a flaw (crack) is formed at the center of the cross section of the round billet. The ridge formed in the center of the round billet becomes an inner surface ridge of the hollow shell by piercing and rolling.
- the inner surface flaw of the hollow shell due to Mannesmann destruction can be reduced.
- the draft rate of the plug tip is lowered, the biting property of the round billet with respect to the inclined roll is lowered. Therefore, it is preferable that the inner surface flaw of the hollow shell can be reduced by other methods.
- Patent Document 1 International Publication No. 2004/052569
- Patent Document 2 Japanese Patent Application Laid-Open No. 2009-18338
- a plug having a specific shape has a tip rolling part, a work part, and a reeling part.
- the tip rolling portion has a cylindrical shape with an outer diameter d, and the tip end surface is formed in a spherical shape with a radius of curvature r.
- the work part is formed of an arc rotation surface having a curvature radius R so that the outer diameter increases continuously toward the rear end in the axial direction, continuously from the tip rolling part.
- the reeling portion is formed at a predetermined taper angle so that the outer diameter continues to the workpiece portion and increases toward the maximum outer diameter D at the rear end in the axial direction.
- the outer diameter d, the radius of curvature R, the axial length L1 of the tip rolling portion, the axial length L2 of the workpiece portion, the axial length L3 of the reeling portion, and the outer diameter of the billet satisfy a predetermined relational expression.
- a pusher device having a specific structure is used.
- This pusher device includes a cylinder device and a pusher mandrel.
- the cylinder device includes a cylinder shaft.
- the pusher mandrel is attached to the tip of the cylinder shaft.
- the front end of the pusher mandrel is brought into contact with the rear end of the billet.
- the cross-sectional area of the pusher mandrel and the cross-sectional area of the billet satisfy a predetermined relational expression.
- the length of the pusher mandrel and the cross-sectional area of the pusher mandrel satisfy a predetermined relational expression.
- the moving distance of the tip of the cylinder shaft during piercing and rolling and the outer diameter of the cylinder shaft satisfy a predetermined relational expression.
- a defect may be inherent in the center of the cross section of the billet before piercing and rolling.
- a defect is referred to as a “center defect”.
- the center defect is, for example, porosity or segregation generated at the center of the billet.
- Center defects include wrinkles formed at the center of the billet. Even if Mannesmann breakage can be suppressed, if a billet having a central defect is pierced and rolled, the central defect may be stretched and appear on the inner surface of the hollow shell.
- Patent Document 3 discloses a technique for suppressing the occurrence of void defects at the center of a slab.
- Patent Document 3 before the inside of the slab extracted from the continuous casting mold completes solidification, the slab is continuously forged under predetermined conditions. However, it is difficult to completely eliminate the void defects.
- An object of the present invention is to provide a perforating apparatus that suppresses generation of internal flaws in a hollow shell.
- the punching device punches a billet.
- the drilling device includes a plug.
- the plug has a through hole.
- the through hole extends on the central axis of the plug and passes through the center of the billet to be drilled.
- the perforating apparatus according to the embodiment of the present invention suppresses generation of inner surface flaws in the hollow shell.
- FIG. 1 is a schematic diagram showing the configuration of a tilt rolling piercer according to an embodiment of the present invention.
- FIG. 2A is a longitudinal sectional view of a plug included in the drilling machine shown in FIG. 1.
- 2B is an enlarged longitudinal sectional view showing a part of the plug shown in FIG. 2A.
- FIG. 3 is a longitudinal sectional view of a conventional plug having no through hole.
- FIG. 4 is a schematic view showing a state where a billet is pierced and rolled using the conventional plug shown in FIG.
- FIG. 5 is a schematic diagram showing a state in which a billet is pierced and rolled using the plug shown in FIG. 2A.
- FIG. 6 is a longitudinal sectional view showing the connection between the plug and the cored bar shown in FIG. 2A.
- FIG. 7 is a longitudinal sectional view of another plug that can be employed in the drilling machine shown in FIG.
- FIG. 8 is a schematic diagram showing a state in which a billet is pierced and rolled using the plug shown in FIG.
- FIG. 9 is a schematic diagram showing a configuration of a press roll type punching machine according to an embodiment of the present invention.
- 10 is a cross-sectional view taken along the line XX in FIG.
- FIG. 11 is a schematic diagram showing a configuration of a perforation press according to an embodiment of the present invention.
- FIG. 12 is an X-ray photograph of a billet pierced and rolled using the plug shown in FIG. 2A.
- FIG. 13 is an X-ray photograph of a billet pierced and rolled using the plug shown in FIG. 14A is an inner surface PT photograph of a hollow shell formed by piercing and rolling a billet using the plug shown in FIG. 2A, and is an inner surface PT photograph of one end side of the hollow shell.
- 14B is an inner surface PT photograph of a hollow shell formed by piercing and rolling a billet using the plug shown in FIG. 2A, and is an inner surface PT photograph of the other end of the hollow shell.
- 15A is an inner surface PT photograph of a hollow shell formed by piercing and rolling a billet using the plug shown in FIG. 3, and is an inner surface PT photograph of one end side of the hollow shell.
- FIG. 15B is an inner surface PT photograph of the hollow shell formed by piercing and rolling the billet using the plug shown in FIG. 3, and is an inner surface PT photograph of the other end of the hollow shell.
- FIG. 16 is a schematic diagram showing an analysis model of numerical analysis by a three-dimensional rigid-plastic finite element method, and is a schematic diagram showing a state where the center portion of the billet is inserted into the through hole of the plug.
- FIG. 17 is an analysis result obtained by numerical analysis by the two-dimensional rigid-plastic finite element method, and shows the distribution of hydrostatic pressure (average stress).
- FIG. 18 is an analysis result obtained by numerical analysis by the two-dimensional rigid-plastic finite element method, and shows the distribution of hydrostatic pressure (average stress).
- FIG. 19 is a cross-sectional view showing a plug used for comparison in Example 4.
- the punching device punches a billet.
- the drilling device includes a plug.
- the plug has a through hole.
- the through hole extends on the central axis of the plug and passes through the center of the billet to be drilled.
- the plug includes a trunk portion and a tip portion.
- the trunk portion has an outer diameter that increases from the front end to the rear end of the plug.
- the tip portion is provided at the tip of the body portion and protrudes in the axial direction of the plug.
- the through hole has an opening at the center of the tip of the tip.
- the front end has an outer diameter that increases from the front end of the plug toward the rear end.
- the taper angle at the front end of the body is larger than the taper angle at the rear end of the tip.
- the tip portion is provided so as to protrude from the tip of the body portion. Therefore, when the plug perforates the billet, the contact area between the billet and the plug at the tip is reduced. As a result, heat input from the billet to the plug is reduced, and the plug is difficult to melt.
- the tip has an outer diameter that increases from the tip of the plug toward the rear end. Therefore, even if melting damage occurs, the machining allowance can be reduced. As a result, it can be reused after cutting.
- the tip surface of the tip may be flat.
- the peripheral edge of the tip surface may be rounded.
- the transverse shape of the through hole may increase from the front end to the rear end of the plug.
- the punching device further includes a cored bar.
- the cored bar is coupled to the rear end of the plug.
- the cored bar has a connection hole extending on the central axis of the cored bar and connected to the through hole. In this case, the center part of the billet that has passed through the through hole enters the connecting hole of the cored bar.
- the piercing device may be a rolling piercing machine further provided with a plurality of rolls.
- the plurality of rolls are arranged around the axial direction of the plug.
- Each of the plurality of rolls may be an inclined roll or a roll having a hole shape.
- the punching device further includes a pusher rod that pushes the billet into the plug.
- the piercing device may be a piercing press that includes a container for storing a billet, and a plug press-pierces the billet in the billet axial direction.
- the plug according to the embodiment of the present invention is used for the punching device according to the embodiment of the present invention.
- the method for manufacturing a seamless steel pipe according to the embodiment of the present invention is performed using the drilling device according to the embodiment of the present invention.
- FIG. 1 shows a tilt rolling type piercing machine 10 as a piercing apparatus according to an embodiment of the present invention.
- the punching machine 10 includes a pair of inclined rolls 12, 12, a plug 14, and a cored bar 16.
- the pair of inclined rolls 12 and 12 are arranged around the pass line PL. That is, the pass line PL is disposed between the pair of inclined rolls 12 and 12. Each of the pair of inclined rolls 12 is disposed to be inclined with respect to the pass line PL. Although not shown, a guide is disposed between the pair of inclined rolls 12 and 12 to suppress the swelling of the material during piercing and rolling.
- the pair of inclined rolls 12 and 12 spirally rotate the billet 18 and pierce and roll the billet 18 together with the plug 14.
- the inclined roll 12 may be a cone type or a barrel type.
- the plug 14 is disposed between the pair of inclined rolls 12 and 12 and on the pass line PL.
- the plug 14 has a circular cross section, and its outer diameter increases from the front end to the rear end of the plug 14. In short, the shape of the plug 14 is substantially bullet-like.
- the plug 14 When the piercing machine 10 pierces and rolls the billet 18, the plug 14 is pushed into the center of the front end surface of the billet 18 (that is, the end surface facing the plug 14) to pierce the billet 18.
- the metal core 16 is disposed on the pass line PL and extends in the pass line PL direction.
- the cored bar 16 has a role of fixing the plug 14 at a predetermined position.
- the front end of the core metal 16 is coupled to the rear end of the plug 14.
- the rear end surface of the plug 14 has a coupling portion that is recessed in the axial direction, and the tip end portion of the cored bar 16 is inserted into the coupling portion of the plug 14 and fixed.
- the punching machine 10 is a two-roll type including a pair of inclined rolls 12 and 12.
- the punch 10 may include three or more inclined rolls arranged around the pass line PL.
- FIG. 2A is a longitudinal sectional view of the plug 14.
- the plug 14 includes a main body 15.
- the main body 15 has a substantially bullet shape.
- the main body 15 includes a distal end portion 22, a body portion 24, and a relief portion 25.
- the tip 22 is provided at the front end of the plug 14 and is the tip of the plug 14.
- the rear end of the front end portion 22 is connected to the front end of the body portion 24.
- the tip portion 22 has a substantially cylindrical shape.
- the distal end portion 22 includes a distal end surface 22FS and a side surface 22SS.
- the front end surface 22FS is provided at the front end portion of the front end portion 22, and faces the front end surface of the billet 18 before piercing and rolling.
- the side surface 22SS is disposed around the central axis C14 of the plug 14. The front end of side surface 22SS is coupled to the peripheral edge of front end surface 22FS.
- the front end portion 22 has a substantially cylindrical shape, but preferably has an outer diameter that increases from the front end of the plug 14 toward the rear end. That is, the side surface 22SS preferably has a tapered shape. As shown in FIG. 2B, the taper angle A22 at the rear end portion of the front end portion 22 is smaller than the taper angle A24 at the front end portion of the body portion 24.
- the taper angle means an angle formed by a tangent line at the measurement position of the side surface 24SS (or the side surface 22SS) and a straight line parallel to the central axis C14. 2A and 2B, the taper angle of the side surface 22SS is substantially constant.
- the tip 22 has a role of suppressing the plug 14 from being melted. Specifically, when the plug 14 punches the billet 18, the distal end portion 22 reduces the contact area between the plug 14 and the billet 18 at the distal end portion 22, thereby reducing heat input from the billet 18 to the plug 14. To do. As a result, the plug 14 is difficult to melt.
- the barrel portion 24 is provided on the rear side of the distal end portion 22 and adjacent to the distal end portion 22.
- the trunk portion 24 has a side surface 24SS.
- the front end of the side surface 24SS is connected to the rear end of the side surface 22SS.
- the outer diameter of the side surface 24SS increases from the front end of the plug 14 toward the rear end.
- the taper angle A24 at the front end portion of the side surface 24SS is larger than the taper angle A22 at the rear end portion of the side surface 22SS. Therefore, the front end portion 22 is provided so as to protrude from the front end of the body portion 24.
- the barrel portion 24 has a role of making the billet 18 pierced by the tip portion 22 into a hollow shell 20 having a desired inner diameter and thickness. Specifically, the body portion 24 expands the inner diameter of the hollow shell 20 by contacting the surface of the hole of the billet 18, that is, the inner surface of the hollow shell 20. The punch 10 is rolled by sandwiching the hollow shell 20 between the body 24 and the inclined roll 12. As a result, the hollow shell 20 having a desired inner diameter and thickness is manufactured.
- a cored bar joint 28 is provided at the rear end of the plug 14. The leading end of the cored bar 16 is fitted into the cored bar coupling part 28, and the plug 14 and the cored bar 16 are coupled.
- the main body 15 of the plug 14 has a through hole 30.
- the through hole 30 is provided on the central axis C14 of the plug 14 and extends in the direction of the central axis C14.
- One end of the through hole 30 opens at the center of the tip surface 22FS.
- the other end of the through hole 30 opens at the center of the bottom surface of the cored bar coupling portion 28. That is, the through hole 30 penetrates the plug 14 in the axial direction.
- the size of the through hole 30 may increase from the front end to the rear end of the plug 14 or may be substantially constant in the axial direction of the plug 14.
- the size of the through hole 30 is appropriately set according to the size of the center defect of the billet 18.
- the cross-sectional shape of the through-hole 30 is circular in the example shown in FIG.
- the billet 18 is heated in a heating furnace.
- the heated billet 18 is removed from the heating furnace.
- the heated billet 18 is pierced and rolled using the piercing machine 10 shown in FIG.
- the plug 14 has a through hole 30. Therefore, when the billet 18 is pierced and rolled using the plug 14, generation of inner surface flaws in the hollow shell 20 can be suppressed. The reason will be described with reference to FIGS.
- FIG. 3 is a longitudinal sectional view showing a plug 14A having no through hole.
- the plug 14A is a plug having a conventional structure.
- the plug 14 ⁇ / b> A does not have the through hole 30.
- FIG. 4 is a schematic diagram showing a process of manufacturing the hollow shell 20 by piercing and rolling the billet 18 using the plug 14A.
- FIG. 5 is a schematic diagram showing a process of manufacturing the hollow shell 20 by piercing and rolling the billet 18 using the plug 14.
- the center portion of the billet 18 enters the through hole 30.
- the center portion of the billet 18 is compressed in front of the plug 14.
- Such a compressive stress is generated when the center portion of the billet 18 enters the through hole 30.
- the central defect 34 is pressure-bonded by this compressive stress. Further, the portion where the center defect 34 is crimped passes through the through hole 30.
- the rear end of the plug 14 is coupled to the front end of the cored bar 16.
- the cored bar 16 has a connection hole 32.
- the connection hole 32 extends on the central axis of the cored bar 16 and has an opening on the front end surface of the cored bar 16 (surface facing the rear end of the plug 14).
- the plug 14 compresses the central portion of the billet 18 that is likely to include the central defect 34 and passes it through the through hole 30. That is, the billet 18 is pierced and rolled by the piercing machine 10 while the center portion of the billet 18 is passed through the through hole 30 of the plug 14 to form the hollow shell 20. Therefore, the center portion of the billet 18 does not form the inner surface of the hollow shell 20. Therefore, if the plug 14 is used, it is difficult for an inner surface flaw to occur in the hollow shell 20.
- the hollow shell 20 is stretched and rolled by, for example, a plug mill or a mandrel mill. After stretching and rolling, the shape is corrected by, for example, a stretch reducer, reeler, sizer or the like. Thereby, the intended seamless steel pipe is manufactured.
- the plug 14 shown in FIG. 2A includes a tip portion 22 protruding from the trunk portion 24.
- the plug in the present embodiment does not include the tip portion 22.
- FIG. 7 is a longitudinal sectional view of the plug 14B of the present embodiment having a shape different from that of FIG. 2A.
- plug 14B includes a main body 15B.
- the main body 15 ⁇ / b> B includes a trunk portion 24 and a relief portion 25.
- the main body 15B further includes a through hole 30.
- the through hole 30 extends on the central axis C14 as in the case of the plug 14.
- One end of the through hole 30 opens at the center of the front end surface 24FS of the body portion 24.
- FIG. 8 is a schematic diagram showing a process of manufacturing the hollow shell 20 by piercing and rolling the billet 18 using the plug 14B.
- the center portion of billet 18 enters through hole 30 as in the case of plug 14. At this time, the center portion of the billet 18 is compressed in front of the plug 14 ⁇ / b> B and further passes through the through hole 30. In short, the center portion of the billet 18 is not included in the hollow shell 20. Therefore, the generation of inner surface flaws of the hollow shell 20 due to the center defect of the billet 18 is suppressed.
- the tilt rolling type drilling machine 10 has been described.
- the punching apparatus according to the embodiment of the present invention is a press roll type drilling machine 40 as shown in FIGS. Also good.
- the punching machine 40 includes a plug 14C, a metal core 16A, a pusher rod 42, an inlet guide 44, a pair of rolls 46 and 46, and an outlet guide 48.
- the plug 14C is disposed on the pass line PL between the pair of rolls 46 and 46.
- the metal core 16A is disposed on the pass line PL and supports the plug 14C.
- the pusher rod 42 is arranged on the pass line PL and pushes the square billet 18A toward the plug 14C.
- the inlet guide 44 is disposed on the pass line PL, and guides the square billet 18A between the hole molds 46A and 46A of the pair of rolls 46 and 46, respectively.
- the pair of rolls 46 and 46 are arranged around the pass line PL.
- the pair of rolls 46, 46 rolls and rolls the square billet 18A together with the plug 14C. Thereby, the hollow shell 20A is manufactured.
- Each of the pair of rolls 46 and 46 has a hole mold 46A.
- the outer peripheral surface of the hollow shell 20A is formed by the pair of hole molds 46A and 46A.
- the outlet guide 48 is disposed on the pass line PL and guides the hollow shell 20A in a predetermined direction.
- the square billet 18A is pushed by the pusher rod 42.
- the square billet 18 ⁇ / b> A pushed by the pusher rod 42 contacts the plug 14 ⁇ / b> C and the pair of rolls 46 and 46.
- the inner surface of the square billet 18A is perforated and expanded by the plug 14C, and the outer surface thereof is formed into a circular shape by the pair of rolls 46 and 46.
- the hollow shell 20A is generated.
- the plug 14C has a through hole 30A. Therefore, as in the case where the billet 18 is pierced and rolled by the piercing machine 10, the central portion of the square billet 18A enters the through hole 30A. As a result, the occurrence of inner surface flaws in the hollow shell 20A due to the center defect of the square billet 18A is suppressed. The central portion of the square billet 18A that has entered the through hole 30A enters the connection hole 32A of the cored bar 16A that supports the plug 14C.
- FIG. 11 shows a piercing press 50 as a piercing device according to an embodiment of the present invention.
- the piercing press 50 is used in a method for producing a seamless steel pipe by a press method (for example, a method for producing a seamless steel pipe by a Eugene Segerne method).
- the drilling press 50 includes a plug 14D, a cored bar 16B, a container 52, a bottom ring 54, and a backup point 56.
- the plug 14D is disposed on the center axis of the billet 18B and press-pierces the billet 18B.
- the metal core 16B is disposed on the central axis of the billet 18B and supports the plug 14D.
- the container 52 has a cylindrical shape extending in the axial direction of the billet 18B and accommodates the billet 18B.
- the bottom ring 54 is disposed at the lower end of the container 52 and supports the billet 18B.
- the bottom ring 54 has a center hole 54A.
- the diameter of the center hole 54A is slightly larger than the diameter of the plug 14D.
- the backup point 56 has a block shape and is arranged in the center hole 54A.
- the pack-up point 56 is supported by a hydraulic device, for example.
- the plug 14D is moved toward the billet 18B. Then, the billet 18B is press-pierced by the plug 14D. Thereby, the hollow shell 20B is manufactured.
- the backup point 56 is pushed by the plug 14D and leaves the center hole 54A.
- the plug 14D has a through hole 30B. Therefore, the center portion of the billet 18B enters the through hole 30B. As a result, the occurrence of flaws on the inner surface of the hollow shell 20B due to the center defect of the billet 18B is suppressed. The center portion of the billet 18B that has entered the through hole 30B enters the connection hole 32B of the cored bar 16B connected to the plug 14D.
- the bottom ring 54 and the backup point 56 are arranged at the lower end of the container 52, but instead of these, a die having an inner diameter slightly larger than the diameter of the plug may be arranged. .
- the plug of the present invention only needs to have a through hole.
- the outer shape of the plug is not particularly limited.
- a billet having a central defect was pierced and rolled using the plug shown in FIG. 2A (hereinafter referred to as the present invention plug), and it was confirmed whether or not internal flaws occurred in the hollow shell.
- the steel type of the billet was SUS420 defined by the JIS standard.
- the billet was heated at 1200 ° C. for 1 hour.
- the diameter of the billet was 70 mm.
- the billet axial length was 370 mm.
- the diameter of the through hole of the plug of the present invention was 10 mm.
- the axial length of the plug was 110 mm.
- the axial length of the tip was 10 mm.
- the axial length of the trunk was 90 mm.
- the axial length of the escape portion was 10 mm.
- the maximum diameter of the plug was 54 mm.
- the outer diameter of the rear end of the tip portion was 22 mm.
- the radius of curvature of the peripheral edge of the tip surface was 4 mm.
- the comparative plug did not have a through hole.
- the axial length of the comparative example plug was 110 mm.
- the axial length of the trunk was 100 mm.
- the axial length of the escape portion was 10 mm.
- the maximum diameter of the plug was 54 mm.
- FIG. 12 shows an X-ray photograph of a billet pierced and rolled using the plug of the present invention.
- FIG. 13 shows an X-ray photograph of a billet that has been pierced and rolled using a comparative plug. All billets used had a similar center defect.
- the inner surface flaws of a plurality of hollow shells manufactured using the plugs of the present invention and the comparative example plugs were examined by a penetration flaw detection test (PT). Specifically, the hollow shell after the penetration test was cut along the axial direction, and the presence or absence of internal flaws was visually observed.
- PT penetration flaw detection test
- 14A and 14B show inner surface PT photographs of a hollow shell formed by piercing and rolling a billet using the plug of the present invention.
- 15A and 15B show an inner surface PT photograph of a hollow shell formed by piercing and rolling a billet using a comparative example plug.
- FIG. 16 shows a state in which the center portion of the billet enters the through hole of the plug in the analytical model of the numerical analysis by the three-dimensional rigid-plastic finite element method.
- the analysis model consisted of one roll, square billet, and plug.
- the cross section of the square billet was a square having a length of one side of 122 mm, and the length of the square billet was 300 mm.
- a central hole having a diameter of 7 mm was formed at the center of the square billet.
- the steel type was JIS standard S45C.
- the heating temperature of the square billet was 1200 ° C.
- the diameter of the rear end of the plug was 60 mm.
- the diameter of the through hole of the plug was 7 mm.
- the diameter of the roll groove bottom was 450 mm.
- the number of rotations of the roll was 10 rpm.
- the center hole formed at the center of the square billet was crimped in front of the plug. And the center part of the square billet including the crimped center hole entered the through hole of the plug. From this result, it was estimated that the generation of inner surface defects caused by the center defect of the square billet was suppressed.
- FIG. 17 shows the distribution of hydrostatic pressure (average stress) obtained by numerical analysis by the two-dimensional rigid-plastic finite element method.
- the billet accommodated in the container has a diameter of 70 mm and an axial length of 240 mm.
- a center hole having a diameter of 7 mm was formed in the center of the billet.
- the steel type was JIS standard S45C.
- the heating temperature of the billet was 1200 ° C.
- the maximum outer diameter of the plug was 60 mm.
- the diameter of the through hole of the plug was 10 mm.
- the pressing speed was 40 mm / s.
- FIG. 18 shows the distribution of hydrostatic pressure (average stress) obtained by numerical analysis by the two-dimensional rigid-plastic finite element method.
- the billet accommodated in the container has a diameter of 80 mm and an axial length of 140 mm.
- a center hole having a diameter of 7 mm was formed in the center of the billet.
- the steel type was JIS standard S45C.
- the heating temperature of the billet was 1200 ° C.
- the plug had a cylindrical shape with an inner diameter of 10 mm and an outer diameter of 52 mm. That is, the diameter of the through hole of the plug was 10 mm.
- the pressing speed was 40 mm / s.
- the billet was press-pierced, and it was confirmed whether internal flaws occurred in the resulting hollow shell (Example). Further, for comparison, the billet was press-pierced using a plug 14E (plug having no through hole) shown in FIG. 19, and it was confirmed whether an inner surface flaw occurred in the obtained hollow shell ( Comparative example).
- a cast material with porosity in the center was manufactured.
- the size of the porosity was 8 to 10 mm at the maximum in the radial direction of the cast material.
- the billet was manufactured by carrying out partial rolling of the casting material with a diameter of 120 mm.
- the billet had a diameter of 100 mm and an axial length of 200 mm.
- the heating temperature of the billet was 1220 ° C.
- the plug according to the example had a maximum outer diameter of 60 mm and a through hole diameter of 15 mm.
- the maximum outer diameter of the plug according to the comparative example was 60 mm.
- the pressing speed was 40 mm / s.
- Ten billets were press punched using each plug. After the obtained hollow shell was acid cleaned, the inner surface flaw was examined by a penetrant flaw detection test (PT).
- PT penetrant flaw detection test
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Metal Rolling (AREA)
- Forging (AREA)
- Earth Drilling (AREA)
- Punching Or Piercing (AREA)
- Drilling And Boring (AREA)
Abstract
Description
[穿孔機の構成]
図1は、本発明の実施の形態による穿孔装置としての傾斜圧延式の穿孔機10を示す。穿孔機10は、一対の傾斜ロール12,12と、プラグ14と、芯金16とを備える。
図2Aは、プラグ14の縦断面図である。図2Aに示すように、プラグ14は、本体15を備える。本体15は、略砲弾形状を有する。本体15は、先端部22と、胴部24と、逃げ部25とを備える。
図2Aに示すように、プラグ14の本体15は貫通孔30を有する。貫通孔30は、プラグ14の中心軸C14上に設けられ、中心軸C14方向に延びている。貫通孔30の一端は、先端面22FSの中央に開口している。貫通孔30の他端は、芯金結合部28の底面中央に開口している。即ち、貫通孔30は、プラグ14を軸方向に貫通している。
まず、ビレット18を加熱炉で加熱する。加熱したビレット18を加熱炉から取り出す。図1に示す穿孔機10を用いて、加熱したビレット18を穿孔圧延し、中空素管20にする。
図2Aに示すプラグ14は、胴部24から突出した先端部22を備える。しかしながら、本実施の形態におけるプラグは、先端部22を備えていない。
第1の実施形態では、傾斜圧延式の穿孔機10について説明したが、本発明の実施の形態による穿孔装置は、図9及び図10に示すように、プレスロール式の穿孔機40であってもよい。
図11は、本発明の実施の形態による穿孔装置としての穿孔プレス50を示す。穿孔プレス50は、プレス方式による継目無鋼管の製造方法(例えば、ユジーンセジェルネ方式による継目無鋼管の製造方法)に用いられる。
Claims (18)
- ビレットを穿孔する穿孔装置であって、
中心軸上に延び、穿孔される前記ビレットの中心部を通す貫通孔を有するプラグを備える、穿孔装置。 - 請求項1に記載の穿孔装置であって、
前記プラグは、
前記プラグの先端から後端に向かって大きくなる外径を有する胴部と、
前記胴部の先端に設けられ、前記プラグの軸方向に突出する先端部とを備え、
前記貫通孔は、前記先端部の先端中央に開口を有する、穿孔装置。 - 請求項2に記載の穿孔装置であって、
前記先端部は、前記プラグの先端から後端に向かって大きくなる外径を有し、
前記胴部の前端部のテーパ角が、前記先端部の後端部のテーパ角よりも大きい、穿孔装置。 - 請求項3に記載の穿孔装置であって、
前記先端部の先端面は平らである、穿孔装置。 - 請求項3又は4に記載の穿孔装置であって、
前記先端面の周縁が丸みを帯びている、穿孔装置。 - 請求項1~5の何れか1項に記載の穿孔装置であって、
前記貫通孔の横断形状が、前記プラグの先端から後端に向かって大きくなる、穿孔装置。 - 請求項1~6の何れか1項に記載の穿孔装置であってさらに、
前記プラグの後端に結合される芯金を備え、
前記芯金は、前記芯金の中心軸上に延び、前記貫通孔につながる接続孔を有する、穿孔装置。 - 請求項1~7の何れか1項に記載の穿孔装置であって、
前記プラグの軸方向の周りに配置される複数のロールをさらに備える、穿孔装置。 - 請求項8に記載の穿孔装置であって、
前記複数のロールが、それぞれ、傾斜ロールである、傾斜圧延式の穿孔装置。 - 請求項8に記載の穿孔装置であって、
前記ビレットを前記プラグに押し込むプッシャロッドをさらに備え、
前記複数のロールが、それぞれ、孔型を有するロールである、プレスロール式の穿孔装置。 - 請求項1~7の何れか1項に記載の穿孔装置であって、
前記ビレットを収容するコンテナをさらに備え、
前記ビレットの軸方向に、前記プラグが前記ビレットをプレス穿孔する、穿孔プレス式の穿孔装置。 - ビレットを穿孔する穿孔装置に用いるプラグであって、
前記プラグの中心軸上に延び、穿孔される前記ビレットの中心部を通す貫通孔を有する本体を備える、プラグ。 - 請求項12に記載のプラグであって、
前記本体は、
前記プラグの先端から後端に向かって大きくなる外径を有する胴部と、
前記胴部の先端に設けられ、前記プラグの軸方向に突出する先端部とを備え、
前記貫通孔は、前記先端部の先端中央に開口を有する、プラグ。 - 請求項13に記載のプラグであって、
前記先端部は、前記本体部の先端から後端に向かって大きくなる外径を有し、
前記胴部の前端部のテーパ角が前記先端部の後端部のテーパ角よりも大きい、プラグ。 - 請求項14に記載のプラグであって、
前記先端部の先端面が平らである、プラグ。 - 請求項14又は15に記載のプラグであって、
前記先端面の周縁が丸みを帯びている、プラグ。 - 請求項12~16の何れか1項に記載のプラグであって、
前記貫通孔の横断形状が、前記本体の先端から後端に向かって大きくなる、プラグ。 - 中心軸上に延びる貫通孔を有するプラグを備えた穿孔装置を準備する工程と、
前記ビレットの中心部を前記プラグの前記貫通孔に通しながら、前記穿孔装置で前記ビレットを穿孔する工程とを備える、継目無鋼管の製造方法。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
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CA2853758A CA2853758C (en) | 2011-11-01 | 2012-11-01 | Piercing apparatus, plug used for piercing apparatus, and method for producing seamless steel pipe |
EP12844807.3A EP2774695B1 (en) | 2011-11-01 | 2012-11-01 | Piercing apparatus, plug used for piercing apparatus, and method for producing seamless steel pipes |
RU2014122200/02A RU2590459C2 (ru) | 2011-11-01 | 2012-11-01 | Прошивная установка, оправка, использующаяся для прошивной установки, и способ изготовления бесшовной стальной трубы |
BR112014009657A BR112014009657A2 (pt) | 2011-11-01 | 2012-11-01 | aparelho de perfuração, plugue usado para aparelho de perfuração e método para produzir tubo de aço sem costura |
CN201280053114.1A CN103917308B (zh) | 2011-11-01 | 2012-11-01 | 穿孔装置、穿孔装置所使用的芯棒以及无缝钢管的制造方法 |
MX2014003760A MX345569B (es) | 2011-11-01 | 2012-11-01 | Aparato de perforación, mandril usado para aparato de perforación, y método para producir tubo de hacer sin costura. |
JP2012550659A JP5187470B1 (ja) | 2011-11-01 | 2012-11-01 | 穿孔装置、穿孔装置に用いられるプラグ及び継目無鋼管の製造方法 |
KR1020147008917A KR101617558B1 (ko) | 2011-11-01 | 2012-11-01 | 천공 장치, 천공 장치에 이용되는 플러그 및 이음매 없는 강관의 제조 방법 |
US14/353,041 US9545658B2 (en) | 2011-11-01 | 2012-11-01 | Piercing apparatus, plug used for piercing apparatus, and method for producing seamless steel pipe |
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JP2011-240609 | 2011-11-01 |
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EP (1) | EP2774695B1 (ja) |
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KR (1) | KR101617558B1 (ja) |
CN (1) | CN103917308B (ja) |
AR (1) | AR088498A1 (ja) |
BR (1) | BR112014009657A2 (ja) |
CA (1) | CA2853758C (ja) |
MX (1) | MX345569B (ja) |
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JP2021107092A (ja) * | 2019-12-27 | 2021-07-29 | Jfeスチール株式会社 | 継目無鋼管製造用プラグ、継目無鋼管製造用ピアッシングミルおよび継目無鋼管の製造方法 |
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CN106391716A (zh) * | 2016-11-18 | 2017-02-15 | 广东龙丰精密铜管有限公司 | 行星轧制铜管空心芯棒 |
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US9545658B2 (en) | 2017-01-17 |
US20140260494A1 (en) | 2014-09-18 |
CA2853758C (en) | 2017-04-11 |
RU2014122200A (ru) | 2015-12-10 |
MX2014003760A (es) | 2014-04-30 |
AR088498A1 (es) | 2014-06-11 |
CA2853758A1 (en) | 2013-05-10 |
EP2774695A1 (en) | 2014-09-10 |
RU2590459C2 (ru) | 2016-07-10 |
MX345569B (es) | 2017-02-01 |
KR101617558B1 (ko) | 2016-05-02 |
EP2774695B1 (en) | 2016-08-03 |
KR20140070581A (ko) | 2014-06-10 |
BR112014009657A2 (pt) | 2017-05-09 |
JP5187470B1 (ja) | 2013-04-24 |
EP2774695A4 (en) | 2015-06-03 |
CN103917308A (zh) | 2014-07-09 |
CN103917308B (zh) | 2016-03-30 |
JPWO2013065780A1 (ja) | 2015-04-02 |
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