EP0176073A2 - Verfahren zum Biegen von Plattenmaterial - Google Patents

Verfahren zum Biegen von Plattenmaterial Download PDF

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Publication number
EP0176073A2
EP0176073A2 EP85112079A EP85112079A EP0176073A2 EP 0176073 A2 EP0176073 A2 EP 0176073A2 EP 85112079 A EP85112079 A EP 85112079A EP 85112079 A EP85112079 A EP 85112079A EP 0176073 A2 EP0176073 A2 EP 0176073A2
Authority
EP
European Patent Office
Prior art keywords
bending
plate material
bent
die shoe
pressing
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Withdrawn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
EP85112079A
Other languages
English (en)
French (fr)
Other versions
EP0176073A3 (de
Inventor
Takanori Matsukura
Kousuke Shiramizu
Osamu Ooaki
Masashi Kudo
Masahiko Takeuchi
Masaru Masaki
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP0176073A2 publication Critical patent/EP0176073A2/de
Publication of EP0176073A3 publication Critical patent/EP0176073A3/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Withdrawn legal-status Critical Current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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
    • B21D5/083—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining profiles with changing cross-sectional configuration

Definitions

  • the present invention relates to a method of bending plate materials, and more particularly to a method of bending metallic plate materials to form bent products with a U-shaped cross section.
  • bent products such as those with a U-shaped cross section from metallic plates
  • stamping by the use of a die assembly comprising a punch and a die
  • roll forming by the use of rolls and other similar methods
  • a bent product 1 having a flange portion 7 with an elongated portion 8 and a shrunk portion 9
  • Fig. 2 shows a method of stamping, in which the left half portion thereof shows the state immediately before working.
  • a plate material 5 is mounted on a die 6 whose surface conforms to the configuration of the plate material 5 to be worked.
  • a punch 2 corresponding to the die 6 is lowered toward the plate material 5, and the plate material 5 is clamped between the punch 2 and a cushion pad 4 provided with a cushion pin 3 therebelow. Furthermore, the plate-material 5 is bent by the die 6 by lowering the punch 2, thereby forming a bent web portion 7 as shown in the right half portion of Fig. 2.
  • Fig. 3A shows a method which employs roll forming.
  • the plate material 5 is continuously worked by a plurality of sets of rolls (in Fig. 3A, a first roll to a fourth roll) onstituted by vertical pairs of forming rolls, thereby forming the plate material 5 in sequence.
  • Fig. 3B shows front elevational views illustrating each of the bending surface of the first roll to the fourth roll shown in Fig. 3A ("Puresu Kako Binran" (Stamping Handbook), pp. 248 - 265, published by Maruzen).
  • the cost of the die assembly is increased since an exclusive-use die assembly is used for one type of bent products, and a large space for storing die assemblies is therefore required. Furthermore, large noise is generated at the time of working. Moreover, the aforementioned method of stamping has an additional drawback in that biting off is liable to occur (the surface of a plate material is liable to be galled by a die assembly). This galling phenomenon is particularly noticeable in the shrunk portion 9.
  • the method which employs roll forming is superior to the aforementioned stamping in terms of noise, galling, and other aspects.
  • the application of this method is restricted to a workpiece which has a fixed cross-sectional shape and a bending line of which is straight or slightly curved.
  • this method has a drawback in that it is impossible to form a bent product 1, whose bent line is not straight but curved as in the case of the one shown in Fig. 1, i.e., one having an elongated portion 8 and a shrunk portion 9.
  • the present invention is intended to overcome the problems of stamping which results from the fact that a die assembly is exclusively used for one type of bent products, namely, the problem of increased cost of die assemblies and the problems of the generation of noise at the time of work and of galling in relation to a workpiece.
  • the present invention is also intended to overcome the problem caused by the fact that formation of a workpiece with a curved bent line is impossible in the roll forming method.
  • a die shoe which has an edge portion serving as a bending surface for the plate material; the plate material is mounted on and secured to the die shoe with the surface thereof which is to be bent extending from the bending surface of the die shoe; a versatile bending means having a pressing surface is provided; the bending means is brought into contact with and pressed against a portion of the surface of the plate material which is to be bent; the bending means is moved along the surface to be bent; and the same surface is bent by small degrees. Consequently, the plate material can be bent in correspondence with the shape of the bending surface formed at the edge portion of said die shoe as well as the shape of the bending means.
  • the plate material surface to be bent is worked by moving a bending means step by step, it is, first of all, possible to prevent generation of noise at the time of work and to preclude the occurrence of any galling of a workpiece.
  • Fig. 4 is a perspective view illustrating a bending method relating to the present invention.
  • an exclusive-use die shoe 10 with a configuration conforming to the shape of a plate material to be worked is shown, and the edge portion of the die shoe 10 is formed as a bending surface 11.
  • the shape of the bending surface 11 is formed in a rectilinear shape in a case where a bending line 12 is a straight line, and in a corresponding shape as shown in the embodiment of the present invention in a case where the bending line 12 is cuved.
  • the plate material 5 is mounted and secured on the die shoe 10 by means of a separate securing member (not shown) in such a manner that the surface to be worked 13 thereof extends from the bending surface 11.
  • a side surface 14 consituting the bending surface 11 of the die shoe 10 is formed at an angle slightly smaller than the bending angle of the surface to be bent 13 of the plate material, and is arranged such that the angular difference A6 therebetween will give the amount of spring back of the surface to be worked 13.
  • Figs. 5 to 7 show versatile bending members 15, 16, and 17 which are used for the bending work in accordance with the present invention.
  • the bending members 15, 16, and 17 have pressing surfaces 19, 20, and 21 and are arranged such as to move along the surface to be bent 13 (i.e., in .the direction of the arrow 28 in Fig. 4) while coming into contact with and pressing a portion of the surface to be bent 13.
  • Each bending member 15, 16, and 17 is formed such as to be split in many stages (split into n) so that the angles 8 1 , 8 2 , ..., ⁇ n of the pressing surfaces 19, 20, and 21 thereof will become gradually larger.
  • the arrangement is such that edge waves are prevented from being formed at the edge portions by gradually enlarging the bending angles of the surface to be bent 13 from the flat state, i.e., by preventing the bending angles from changing abruptly.
  • fixed guides may be used as the bending members 15, 16, and 17, in the present embodiment thery are formed with the structure of rotating rolls and are arranged such that their frictional resistance will become small at the time when the bending members are moved along the surface to be bent 13.
  • the bending members 15, 16, 17 each having a pressing surface inclined by angle ⁇ 1 , ⁇ 2 ... ⁇ n against the axis of the bending member, respectively, are used.
  • a bending member 18 having a pressing- surface parallel to the axis of the bending member may be used by inclining the bending member by angle ⁇ 1 , ⁇ 2 ... 8 n step by step against the plate material.
  • a method of bending a plate material will be described on the basis of the aforementioned embodiment.
  • the plate material 5 is mountd on and secured to the die shoe 10, and the bending member 15 is first brought into contact with and pressed against the surface to be bent 13 of the plate material 5. Then, the surface to be bent 13 is bent by moving the bending member 15 along the surface to be bent 13. Next, the bending member 15 is replaced with the bending member 16, and bending work is carried out in a manner similar to that described above. Further, bending work is carried out step by step by the bending member 17 so as to obtain an intended final bending angle, thereby finishing the plate material into a desired bent product.
  • a bent product 31 having a flat web surface and a bent flange surface has illustrated the example of forming a bent product having a flat web surface and a bent flange surface.
  • a plate material 5 as shown in Fig. 10A is bent to form a web portion 35 as seen in Fig. 10B.
  • a flange portion 37 with an elongated portion 38 and a shrunk portion 39 is formed by the aforementioned method, so that a bent product 31 as shown in Fig. 9 is formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP85112079A 1984-09-26 1985-09-24 Verfahren zum Biegen von Plattenmaterial Withdrawn EP0176073A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP200739/84 1984-09-26
JP20073984A JPS61159225A (ja) 1984-09-26 1984-09-26 板材の曲げ加工方法

Publications (2)

Publication Number Publication Date
EP0176073A2 true EP0176073A2 (de) 1986-04-02
EP0176073A3 EP0176073A3 (de) 1986-12-03

Family

ID=16429362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112079A Withdrawn EP0176073A3 (de) 1984-09-26 1985-09-24 Verfahren zum Biegen von Plattenmaterial

Country Status (2)

Country Link
EP (1) EP0176073A3 (de)
JP (1) JPS61159225A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754171A1 (de) * 1997-12-06 1999-06-10 Volkswagen Ag Verfahren zur Herstellung eines Profils und Vorrichtung zur Durchführung des Verfahrens
CN114769363A (zh) * 2022-06-21 2022-07-22 四川航天长征装备制造有限公司 一种航天用板条零件手工快速消除成形内应力方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353616A (en) * 1991-04-24 1994-10-11 Engel Industries, Inc. Pittsburgh seam closer having single seaming roll
JP6421584B2 (ja) * 2014-12-18 2018-11-14 株式会社デンソー 曲げ加工装置および点火プラグ製造機
GB201814069D0 (en) * 2018-08-29 2018-10-10 Cambridge Entpr Ltd Working of sheet metal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE641744C (de) * 1934-11-08 1937-02-12 Franz Steinbuechel Vorrichtung zum Biegen von Blechen in die Form von Profilen
US3756057A (en) * 1970-05-11 1973-09-04 Roll Forming Corp Roll forming
FR2525504A1 (fr) * 1982-04-27 1983-10-28 Uk Nii Metallov Cage pour les trains a fabriquer par cintrage des profiles en " u " avec ailes non paralleles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE641744C (de) * 1934-11-08 1937-02-12 Franz Steinbuechel Vorrichtung zum Biegen von Blechen in die Form von Profilen
US3756057A (en) * 1970-05-11 1973-09-04 Roll Forming Corp Roll forming
FR2525504A1 (fr) * 1982-04-27 1983-10-28 Uk Nii Metallov Cage pour les trains a fabriquer par cintrage des profiles en " u " avec ailes non paralleles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754171A1 (de) * 1997-12-06 1999-06-10 Volkswagen Ag Verfahren zur Herstellung eines Profils und Vorrichtung zur Durchführung des Verfahrens
DE19754171B4 (de) * 1997-12-06 2006-04-20 Volkswagen Ag Verfahren zur Herstellung eines Profils mit in seinem Längsverlauf sich änderndem Querschnitt und Vorrichtung zur Durchführung des Verfahrens
CN114769363A (zh) * 2022-06-21 2022-07-22 四川航天长征装备制造有限公司 一种航天用板条零件手工快速消除成形内应力方法
CN114769363B (zh) * 2022-06-21 2022-10-14 四川航天长征装备制造有限公司 一种航天用板条零件手工快速消除成形内应力方法

Also Published As

Publication number Publication date
EP0176073A3 (de) 1986-12-03
JPS61159225A (ja) 1986-07-18

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Inventor name: MATSUKURA, TAKANORI

Inventor name: KUDO, MASASHI

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