EP3323521A1 - Verfahren zur herstellung eines l-förmigen vierkantrohrs, vorrichtung zur herstellung eines l-förmigen vierkantrohrs und l-förmiges vierkantrohr - Google Patents

Verfahren zur herstellung eines l-förmigen vierkantrohrs, vorrichtung zur herstellung eines l-förmigen vierkantrohrs und l-förmiges vierkantrohr Download PDF

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Publication number
EP3323521A1
EP3323521A1 EP16824407.7A EP16824407A EP3323521A1 EP 3323521 A1 EP3323521 A1 EP 3323521A1 EP 16824407 A EP16824407 A EP 16824407A EP 3323521 A1 EP3323521 A1 EP 3323521A1
Authority
EP
European Patent Office
Prior art keywords
steel pipe
square steel
groove section
square pipe
shaped
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16824407.7A
Other languages
English (en)
French (fr)
Other versions
EP3323521A4 (de
Inventor
Ryuji Tanoue
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.)
Nippon Steel Corp
Original Assignee
Nisshin Steel Co 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 Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Publication of EP3323521A1 publication Critical patent/EP3323521A1/de
Publication of EP3323521A4 publication Critical patent/EP3323521A4/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/74—Making other particular articles frames for openings, e.g. for windows, doors, handbags
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/32—Columns; Pillars; Struts of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped

Definitions

  • the present invention relates to a method for manufacturing an L-shaped square pipe, a device for manufacturing an L-shaped square pipe and an L-shaped square pipe.
  • an L-shaped square steel pipe is used as a structural member which forms a frame for a unit bath platform or a structural member which is used as a partition wall for attaching an exterior wall panel for a prefabricated house to a beam or the like.
  • a method for manufacturing an L-shaped square steel pipe a method is used in which in a state where an end portion of one of two square steel pipes is pressed to the side surface of an end portion of the other square steel pipe, they are welded together, and in which thus the square steel pipes are fixed.
  • a technology is also proposed in which V-shaped cutouts are formed in the upper surface and both side surfaces of square steel pipes and bending is performed, and in which both side surfaces abutting on each other are thereafter welded and manufacturing is performed (see Patent Document 1).
  • Patent Document 1 Japanese Unexamined Patent Application, Publication No. 2010-201503
  • the V-shaped cutouts are formed in the upper surface and both side surfaces of the square steel pipe, and thus among the four surfaces of the square steel pipe, only one surface which is the bottom surface is not cut out.
  • the strength thereof is significantly lowered as compared with the other portions.
  • the dimensional accuracy may be lowered by the occurrence of a warp or a twist caused by thermal distortion.
  • the welding there is also a problem in which an operational environment is degraded by the production of fumes.
  • An object of the present invention is to provide a method for manufacturing an L-shaped square pipe whose sufficient strength is acquired without performing welding, a device for manufacturing an L-shaped square pipe and an L-shaped square pipe.
  • a method for manufacturing an L-shaped square pipe including: a groove section forming step for forming a groove section by pressing one surface of a square pipe along a shorter direction of the one surface to the side of the other surface located on a reverse side of the one surface; and a bending step for bending the square pipe such that both sides of the one surface sandwiching the groove section approach each other.
  • the groove section is formed by pressing, to the one surface, a corner portion of a V-shaped portion in a pressing member having the V-shaped portion.
  • the angle of the corner portion of the V-shaped portion corresponds to a bending angle of the square pipe.
  • the method further includes, before the groove section forming step, a buckling line forming step for forming buckling lines by pressing two side surfaces between the one surface of the square pipe and the other surface inward along a longitudinal direction of the side surfaces.
  • a device for manufacturing an L-shaped square pipe including: a groove section forming device for forming a groove section by pressing one surface of a square pipe along a shorter direction of the one surface to the side of the other surface located on a reverse side of the one surface; and a bending device for bending the square pipe such that both sides of the one surface sandwiching the groove section approach each other.
  • the present invention is an L-shaped square pipe, in which a square pipe is bent through a groove section provided along a shorter direction of one surface thereof.
  • the present invention it is possible to provide a method for manufacturing an L-shaped square pipe whose sufficient strength is acquired without performing welding, a device for manufacturing an L-shaped square pipe and an L-shaped square pipe.
  • FIGS. 1A to 1D are diagrams illustrating the method for manufacturing the L-shaped square steel pipe 1A according to the present embodiment.
  • one surface 1a of a square steel pipe 1 which is extended linearly as shown in Fig.1A is pressed along the shorter direction of the one surface 1a to the side of the other surface 1b located on the reverse side of the one surface 1a.
  • a groove section 5 is formed.
  • the square steel pipe 1 is bent, and thus the L-shaped square steel pipe 1A having a bent portion A as shown in Fig.1D is manufactured.
  • the square steel pipe 1 which is bent in the shape of the letter L in the present embodiment is a hollow square pipe whose cross section is rectangular and which is made of steel.
  • the square pipe is not limited to steel, and any other material may be used as long as it is a material which can be plastically deformed by being bent.
  • the cross section of the square steel pipe 1 may be square.
  • the cross section of the square steel pipe 1 is rectangular, and the width of the one surface 1a and the other surface 1b in the shorter direction is greater than the width of side surfaces 1c and 1d in the shorter direction.
  • the angle at which the bent portion A is bent is not limited to a right angle, and the angle may be an acute angle or an obtuse angle.
  • the method for manufacturing the L-shaped square steel pipe 1A includes: a buckling line forming step ( Fig.1B ) for providing a buckling line 4 by pressing the side surfaces 1c and 1d of the square steel pipe 1 shown in Fig.1A ; a groove section forming step ( Fig.1C ) for forming the groove section 5 by pressing the one surface 1a of the square steel pipe 1; and a bending step ( Fig.1D ) for bending the square steel pipe 1.
  • the method for manufacturing the L-shaped square steel pipe 1A is performed by a manufacturing device 100 for an L-shaped square pipe which includes a buckling line forming device 2, a groove section forming device 3 and a bending device 15 which will be described later.
  • a manufacturing device 100 for an L-shaped square pipe which includes a buckling line forming device 2, a groove section forming device 3 and a bending device 15 which will be described later.
  • the method for manufacturing the L-shaped square steel pipe 1A according to the present embodiment is not limited to the use of the manufacturing device 100.
  • the buckling line forming step is a step for forming the buckling lines 4 in the side surfaces 1c and 1d by pressing the side surfaces 1c and 1d of the square steel pipe 1.
  • buckling line forming device 2 for realizing the buckling line forming step is shown in Fig. 2 .
  • the device for forming the buckling lines 4 in the side surfaces 1c and 1d of the square steel pipe 1 is not limited to the buckling line forming device 2.
  • the buckling line forming device 2 includes two side surface pressing punches 6 having a shape in which a V-shaped portion 6a is formed in one side surface of a rectangular parallelepiped.
  • the two side surface pressing punches 6 are arranged such that the corner portions 6b of the V-shaped portions 6a are along the longitudinal direction of the side surfaces 1c and 1d. Furthermore, the corner portions 6b of the V-shaped portions 6a are arranged in a state where they can abut on substantially central portions of the side surfaces 1c and 1d so as to sandwich the square steel pipe 1 from the sides of the side surfaces 1c and 1d.
  • corner portions 6b of the V-shaped portions 6a in the two side surface pressing punches 6 are respectively made to abut on the substantially central portions of the side surfaces 1c and 1d of the square steel pipe 1 along the longitudinal direction.
  • the length of the buckling lines 4 is adjusted as necessary so as to correspond to the dimensions of the square steel pipe 1 such that in the groove section forming step described later, the portion where the buckling lines 4 are provided is easily buckled inward.
  • the amount of deformation (depth) of the buckling lines 4 is preferably deeper as long as the side surfaces 1c and 1d do not break.
  • the two side surface pressing punches 6 are separated from the side surfaces 1c and 1d of the square steel pipe 1.
  • the groove section forming step is a step for forming the V-shaped groove section 5 by pressing the one surface 1a of the square steel pipe 1 to the side of the other surface 1b along the shorter direction of the one surface 1a.
  • FIG. 3 A specific example of the groove section forming device 3 (crushing die) for realizing the groove section forming step is shown in Fig. 3 .
  • the groove section forming device 3 includes two side surface holding portions 7 and a groove section forming punch 8.
  • the device for forming the V-shaped groove section 5 in the square steel pipe 1 by pressing the one surface 1a of the square steel pipe 1 is not limited to this device.
  • the side surface holding portions 7 are formed in the shape of a rectangular parallelepiped, and abut on the side surfaces 1c and 1d of the square steel pipe 1 so as to hold the square steel pipe 1.
  • Fig. 3 one of the two side surface holding portions 7 which overlaps the square steel pipe 1 is indicated by dotted lines.
  • the groove section forming punch 8 has a shape in which a V-shaped portion 8a is formed in one surface of the rectangular parallelepiped.
  • the groove section forming punch 8 is arranged above the one surface 1a such that the corner portion 8b of the V-shaped portion 8a is located on a center line M in a place of the one surface 1a where the groove section is to be formed.
  • the angle ⁇ of the V-shaped portion 8a is slightly larger than the bending angle of the L-shaped square steel pipe 1A (in the present embodiment, a right angle (90°)).
  • the angle ⁇ of the V-shaped portion 8a is set slightly larger than the bending angle of the square steel pipe 1, and thus when the square steel pipe 1 is bent in the subsequent bending step, the bending angle of the L-shaped square steel pipe 1A is a desired value (in the present embodiment, a right angle (90°)).
  • the corner portion 8b of the V-shaped portion 8a is preferably rounded such that in the formation of the V-shaped groove section 5, the square steel pipe 1 is prevented from being broken.
  • the amount of pressing of the groove section forming punch 8, that is, the depth over which the groove section forming punch 8 is pressed here is such an amount that that the one surface 1a makes contact with the other surface 1b. In this way, the individual surfaces of the square steel pipe 1 are prevented from being broken.
  • the square steel pipe 1 is first arranged between the two side surface holding portions 7.
  • the depth over which the place is pressed here is such a depth that the one surface 1a makes contact with the other surface 1b.
  • the groove section forming punch 8 is separated from the one surface 1a of the square steel pipe 1.
  • the L-shaped square steel pipe 1A in which the square steel pipe 1 is bent substantially at a right angle is manufactured
  • the angle of the L-shaped portion of the L-shaped square steel pipe 1A can be adjusted, and the angle of the corner portion 8b of the groove section forming punch 8 can also be adjusted so as to correspond to the angle of the L-shaped portion.
  • the bending step is a step of bending the square steel pipe 1 such that both sides (one side 1aa and the other side 1ab) sandwiching the portion of the one surface 1a where the groove section 5 is formed approach each other.
  • FIG. 4 A specific example of the bending device (fold bending die) 15 for realizing the bending step is shown in Fig. 4 .
  • the device for bending the square steel pipe 1 is not limited to this device.
  • the bending device 15 includes two retaining plates 9, a top die 10, a bottom die 11, a bend die 12 and a bend punch 13.
  • the retaining plates 9 are plate members which retain the side surfaces 1c and 1d of the square steel pipe 1. Two retaining plates 9 are provided, the square steel pipe 1 is sandwiched therebetween and thus the side surfaces 1c and 1d are retained, with the result that the square steel pipe 1 is held so as not to move. In Fig. 4 , one of the retaining plates 9 is indicated by dotted lines.
  • the top die 10 has substantially the same width as the square steel pipe 1, and is arranged so as to retain the one side 1aa sandwiching the portion of the one surface 1a of the square steel pipe 1 where the groove section 5 is formed.
  • the bottom die 11 has substantially the same width as the square steel pipe 1, and is arranged on a side opposite to the top die 10 (the side in contact with the other surface 1b of the square steel pipe 1), sandwiching the square steel pipe 1.
  • the bend die 12 has substantially the same width as the square steel pipe 1, and can be rotated about a rotation shaft 14 with respect to the bottom die 11.
  • the bend die 12 is inclined substantially perpendicular to the bottom die 11 about the rotation shaft 14.
  • the bend punch 13 is formed in the shape of a rectangular parallelepiped, and is coupled to an unillustrated advance/retraction mechanism. In the state of Fig.4A before the square steel pipe 1 is bent, one surface perpendicular to the advance/retraction direction abuts on the bend die 12.
  • the bend punch 13 When the bend punch 13 is moved to the side of the square steel pipe 1 by the unillustrated advance/retraction mechanism, the bend die 12 is pressed up.
  • the bend die 12 is rotated about the rotation shaft 14.
  • the amount of pressing up of the bend punch 13 is adjusted, and thus it is possible to adjust the bending angle of the L-shaped bent portion A in the L-shaped square steel pipe 1A.
  • the bend punch 13 is most pressed up, and thus the L-shaped square steel pipe 1A is bent at 90°.
  • Fig. 5 is a photograph of the square steel pipe 1 in a state where the groove section 5 is formed by the groove section forming step in the manufacturing method according to the present embodiment.
  • Fig. 6 is a photograph of the bent portion A of the L-shaped square steel pipe 1A which has been bent by the bending step in the manufacturing method according to the present embodiment.
  • the L-shaped square steel pipe 1A manufactured in the present embodiment is formed without the four side surfaces of the square steel pipe 1 being cut out.
  • the strength is prevented from being lowered, and the laminated portion is further hardened by being bent, with the result that the strength is enhanced without welding.
  • bent portions or both folded side surfaces may be joined by welding joining or an adhesive.
  • bending is performed twice on one square steel pipe 1, and thus it is possible to stably manufacture a square steel pipe 1B having two bent portions B at low cost.
  • bending is performed three times on the square steel pipe 1, and thus it is possible to stably manufacture a rectangular square steel pipe 1C having four bent portions C at low cost.
  • a household electrical appliance member such as a high-strength housing of a household electrical appliance or a pallet surface member, or a residential-related member such as a frame for a unit bath platform.
  • the manufacturing device 100 for the L-shaped square pipe which includes the buckling line forming device 2, the groove section forming device 3 and the bending device 15 described above is used, and thus it is possible to bend the square steel pipe 1 highly accurately, smoothly and stably.
  • the present invention is not limited to bending performed by the bending device described above, and the L-shaped square pipe may be formed without use of these devices (dies).

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP16824407.7A 2015-07-13 2016-07-08 Verfahren zur herstellung eines l-förmigen vierkantrohrs, vorrichtung zur herstellung eines l-förmigen vierkantrohrs und l-förmiges vierkantrohr Withdrawn EP3323521A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015139858A JP6416049B2 (ja) 2015-07-13 2015-07-13 Ｌ字型角管の製造方法、ｌ字型角管の製造装置およびｌ字型角管
PCT/JP2016/070294 WO2017010427A1 (ja) 2015-07-13 2016-07-08 Ｌ字型角管の製造方法、ｌ字型角管の製造装置およびｌ字型角管

Publications (2)

Publication Number Publication Date
EP3323521A1 true EP3323521A1 (de) 2018-05-23
EP3323521A4 EP3323521A4 (de) 2019-03-20

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EP16824407.7A Withdrawn EP3323521A4 (de) 2015-07-13 2016-07-08 Verfahren zur herstellung eines l-förmigen vierkantrohrs, vorrichtung zur herstellung eines l-förmigen vierkantrohrs und l-förmiges vierkantrohr

Country Status (8)

Country Link
US (1) US20190001388A1 (de)
EP (1) EP3323521A4 (de)
JP (1) JP6416049B2 (de)
CN (1) CN108025342A (de)
AU (1) AU2016292581A1 (de)
MY (1) MY190827A (de)
TW (1) TWI683709B (de)
WO (1) WO2017010427A1 (de)

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Publication number Priority date Publication date Assignee Title
CN110479863A (zh) * 2019-08-27 2019-11-22 厦门恒宇源工贸有限公司 一种u型槽钢加工方法及加工设备
CN111702420B (zh) * 2020-06-28 2021-10-26 福建省诏安鸿辉不锈钢材料有限公司 一种金属钢管加工系统与金属钢管加工工艺
KR102569128B1 (ko) * 2020-12-14 2023-08-21 김재봉 관의 부분 절단을 위한 펀칭 지그 장치

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Publication number Publication date
TW201711768A (zh) 2017-04-01
EP3323521A4 (de) 2019-03-20
WO2017010427A1 (ja) 2017-01-19
JP6416049B2 (ja) 2018-10-31
CN108025342A (zh) 2018-05-11
US20190001388A1 (en) 2019-01-03
TWI683709B (zh) 2020-02-01
AU2016292581A1 (en) 2018-02-15
MY190827A (en) 2022-05-12
JP2017018997A (ja) 2017-01-26

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