WO2019064462A1 - Stretch forming device and stretch forming method - Google Patents

Stretch forming device and stretch forming method Download PDF

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Publication number
WO2019064462A1
WO2019064462A1 PCT/JP2017/035357 JP2017035357W WO2019064462A1 WO 2019064462 A1 WO2019064462 A1 WO 2019064462A1 JP 2017035357 W JP2017035357 W JP 2017035357W WO 2019064462 A1 WO2019064462 A1 WO 2019064462A1
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WO
WIPO (PCT)
Prior art keywords
mold
molded
molding surface
molding
stretch
Prior art date
Application number
PCT/JP2017/035357
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French (fr)
Japanese (ja)
Inventor
山田　毅
亮 河野
淳史 菅井
優 松永
傑 近藤
智史 鎌田
Original Assignee
三菱重工業株式会社
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.)
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Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to PCT/JP2017/035357 priority Critical patent/WO2019064462A1/en
Priority to JP2019545517A priority patent/JP6834014B2/en
Priority to US16/496,774 priority patent/US20200108431A1/en
Priority to EP17927131.7A priority patent/EP3586989A4/en
Publication of WO2019064462A1 publication Critical patent/WO2019064462A1/en

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    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
    • 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
    • B21D11/02—Bending by stretching or pulling over a die
    • 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/02—Die constructions enabling assembly of the die parts in different ways
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/08—Dies with different parts for several steps in a process
    • 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
    • B21D53/92—Making other particular articles other parts for aircraft

Definitions

  • the present invention relates to a stretch molding apparatus and a stretch molding method.
  • Aircraft parts such as the fuselage and wings of an aircraft are composed of structural members such as plate-like skins, long frames and stringers. Since the fuselage, the wing and the like have a curved shape, the frame and the stringer have a curved shape which is curved along the longitudinal direction.
  • the O material is roll-formed on a material (also called an O-material) that has been conventionally annealed (annealed) by a roll-forming apparatus. It has an approximate shape. Thereafter, solution treatment is performed on the O material obtained by roll forming to obtain W material.
  • a material also called an O-material
  • annealed annealed
  • Patent Document 1 in a molding apparatus that performs stretch molding, a molding surface is formed by a plurality of blocks, and the position of each block is individually moved in the molding direction, so that the shape of the molding surface can be changed It is disclosed to perform good stretch molding without relative movement with respect to the long material during molding.
  • This invention is made in view of such a situation, Comprising: The stretch molding apparatus and stretch molding which can reduce the bias
  • the stretch forming device and the stretch forming method of the present invention adopt the following means. That is, the stretch forming apparatus according to the first aspect of the present invention comprises a mold and a gripping part for gripping both ends of the long material to be molded, and the cross-sectional shape of the mold is the molding surface
  • the center side has an expanded curved shape, and the molding surface of the mold is formed to give a curved shape to the material to be molded, and the length along the longitudinal direction of the material to be molded Is shorter than the molding surface, and a second mold having a second molding surface along the molding surface is removably installed at the central portion of the molding surface, and the second mold is installed on the molding surface
  • a first mode in which only the second mold presses the material to be molded while the holding surface applies a tensile force to the material to be molded;
  • a stretch forming apparatus includes a mold and a gripping portion that grips both end portions of the long material to be molded, the mold being in the longitudinal direction of the material to be molded It has a plurality of divided molds which are divided into a plurality of pieces and whose positions relative to the molding material side can be individually changed, and among the plurality of divided molds, the divided molds installed at the center portion are installed at the end
  • the split mold disposed in the central portion while applying a tensile force to the material to be molded by the holding portion when disposed so as to project to the side of the material to be molded more than the split molds being cut
  • the first mode for pressing the material to be molded only, and the plurality of divided dies disposed at the central portion and the end portion are arranged to give a curved shape to the material to be molded When the material to be molded While applying tension force Tsu, and a second mode in which said plurality of split molds disposed on said end portion and the central portion is
  • the stretch molding apparatus comprises a mold and a grip portion for gripping both ends of the material to be molded which is long, and the cross-sectional shape of the mold is the center side of the molding surface
  • the mold has a curved shape, and the molding surface of the mold is formed to give a curved shape to the material to be molded, and a tensile force is applied to the material to be molded by the grip portion.
  • a first mode in which only the central portion of the molding surface of the mold presses the material to be molded while applying, and a tensile force is applied to the material to be molded by the gripping portion;
  • the entire molding surface has a second mode in which the molding material is pressed.
  • a stretch molding method comprises a mold and a grip portion for gripping both end portions of a long material to be molded, and the cross-sectional shape of the mold is the center side of the molding surface It is a stretch molding method using a stretch molding apparatus having a bulging curvilinear shape and the molding surface of the mold being formed to give a curvilinear shape to the material to be molded, the material to be molded Placing a second mold having a second molding surface along the molding surface and having a length along the longitudinal direction of the molding shorter than the molding surface at a central portion of the molding surface; A step of pressing only the second mold while pressing the material to be molded while applying a tensile force to the material to be molded by the grip when the mold is installed on the molding surface; When the mold is removed from the molding surface, the While applying a tensile force to the object to be molded material by part, and a step in which the mold is pressed against the object to be molded material.
  • a stretch molding method comprises a mold and a gripping portion for gripping both end portions of the long material to be molded, wherein the mold is in the longitudinal direction of the material to be molded
  • a stretch molding method comprises a mold and a grip portion for gripping both end portions of the long material to be molded, and the cross-sectional shape of the mold is the center side of the molding surface
  • the present invention it is possible to reduce the deviation of the amount of deformation of the central portion and the end portion of the long material to be molded, and the residual stress in the vicinity of the central portion is also reduced similarly to the end portion.
  • cutting such as etching or drilling is performed after stretch molding, it is possible to reduce the shape change occurring in the material and the variation among the materials.
  • the stretch forming apparatus 1 is an apparatus that performs stretch forming on a long material 20 that is a material to be molded using a mold 2.
  • the elongated material 20 is made of, for example, an aluminum alloy, and is a material manufactured as a structural member such as a frame and a stringer that constitutes an aircraft component such as an aircraft fuselage or a wing.
  • the elongated material 20 is a material (W material obtained by roll forming the annealed (annealed) material (O material) and solution treated with the O material obtained by roll forming (W Material).
  • the elongated material 20 may be a material obtained by performing roll forming on a W material obtained by performing solution treatment on the annealed material (O material).
  • the grips 3 respectively grip both ends of the elongated material 20 and press the elongated material 20 against the mold 2 while applying a tensile force (or the elongated material 20 to the mold 2 Press). And stretch molding carries out plastic deformation with respect to the elongate material 20 formed in the curve shape by roll forming, and further gives curve shape.
  • the stretch forming apparatus 1 includes a mold 2, a gripping unit 3, a moving unit 4, an operation unit 5 and the like.
  • the mold 2 has a long molding surface 6 along the longitudinal direction of the long material 20 which is a molding material.
  • the molding surface 6 of the mold 2 is formed to give a curved shape to the elongated material 20, and has a curved surface.
  • the cross-sectional shape of the mold 2 is a curved shape in which the center side of the molding surface 6 bulges, and is, for example, a part of a circular arc or an ellipse.
  • the gripping portion 3 is configured to grip an end portion of the elongated material 20.
  • the gripping portions 3 are respectively installed at both end portions of the elongated material 20.
  • the gripping unit 3 is connected to the moving unit 4 and can be moved by the moving unit 4.
  • the second mold 7 is removably installed at the central portion of the molding surface 6 of the mold 2 according to the present embodiment.
  • the second mold 7 has a second molding surface 8 along the molding surface 6 whose length along the longitudinal direction of the elongated material 20 is shorter than the molding surface 6.
  • the second molding surface 8 has, for example, a curved surface parallel to the molding surface 6 of the mold 2.
  • the length of the second mold 7 is about 1/4 to 1/3 of the length of the mold 2.
  • the moving unit 4 moves the elongated material 20 held by the holding unit 3 to the molding surface 6 side of the mold 2 by moving the holding unit 3, and the second mold 7 is not installed.
  • the long material 20 is pressed against the molding surface 6 of the mold 2 or when the second mold 7 is installed, it is pressed against the second molding surface 8 of the second mold 7. Further, the moving unit 4 is pressed against the molding surface 6 of the mold 2 or the second molding surface 8 of the second mold 7 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. A tensile force is applied to the elongated material 20.
  • the operation unit 5 receives an input operation from a worker and transmits an operation signal to the moving unit 4.
  • the moving unit 4 moves the holding unit 3 to move the elongated material 20 held by the holding unit 3 toward the molding surface 6 of the mold 2.
  • the invention is not limited to this example, and the mold 2 may be moved toward the elongated material 20 by a moving unit (not shown) for moving the mold 2.
  • the second mold 7 is installed on the molding surface 6 of the mold 2. Then, the elongated material 20 gripped by the gripping unit 3 is moved to press the elongated material 20 against the second molding surface 8 of the second mold 7. In addition, the moving unit 4 pulls the elongated material 20 pressed against the second molding surface 8 of the second mold 7 by moving the gripping unit 3 to the outside in the longitudinal direction of the elongated material 20. Apply a force (first mode). At this time, the elongated material 20 is prevented from coming in contact with the molding surface 6 of the mold 2.
  • the contact area between the elongated material 20 and the second mold 7 becomes smaller than the contact area between the elongated material 20 and the mold 2 when the second mold 7 is not installed.
  • a tensile force is applied to the material 20
  • the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased.
  • the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
  • the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping portion 3 is moved to separate the elongated material 20 from the second molding surface 8, and the second mold 7 is removed from the molding surface 6.
  • the moving unit 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. (Second mode).
  • the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the molding surface 6.
  • the elongated material 20 is plastically deformed along the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.
  • the curving shape is applied to the elongated material 20 by pressing against the molding surface 6 of the mold 2, but in the present embodiment, the second gold having a small contact area is first
  • the elongated material 20 is pressed against the second molding surface 8 of the mold 7 to reduce the frictional force acting in the vicinity of the central portion of the elongated material 20 and to increase the tensile force transmitted to the vicinity of the central portion.
  • the amount of deformation generated near the central portion of the material 20 is increased.
  • the stretch molding is performed again by the mold 2 on the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.
  • the mold 2 has a plurality of divided molds 10. That is, the mold 2 is divided into a plurality of pieces in the longitudinal direction of the elongated material 20 which is a material to be molded. And a plurality of division dies 10 can change the position to the long material 20 side individually, respectively.
  • the contact portion with the elongated material 20 in each of the divided molds 10 has a curved surface as shown in FIGS. 3 and 4.
  • a moving unit 11 for moving the split mold 10 is further provided.
  • each divided mold 10 first mode
  • the split mold 10 installed at the center of the plurality of split molds 10 is an end portion It can be disposed so as to project on the side of the elongated material 20 more than the divided mold 10 disposed in the above.
  • the length of the central portion from which the split mold 10 protrudes is about 1/4 to 1/3 of the entire length of the mold 2.
  • the plurality of divided dies 10 can give the elongated material 20 a curved shape.
  • switching between the first mode and the second mode is possible.
  • switching between the first mode and the second mode may be performed manually by the operator, or the amount of deformation of the elongated material 20 is detected to confirm that a predetermined amount of deformation is applied. It may be performed by the control device to shift from the first mode to the second mode at the same time.
  • the split mold 10 may be split into two or more at the central portion and the end portion, respectively, to form a finely curved shape, as shown in FIG.
  • the split mold 10 may have a total of three in the center, one at each end. Moreover, the combination of both is also possible.
  • the split molds 10 installed at the central part are disposed at the end parts. It is made to project and arrange
  • the contact area between the elongated material 20 and the divided mold 10 is smaller than the contact area between the elongated material 20 and the mold 2 when pressing all the divided molds 10, so the elongated shape
  • a tensile force is applied to the material 20
  • the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased.
  • the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
  • each divided mold 10 is moved, and the plurality of divided molds 10 are arranged in a curved shape in which the central side bulges so that a curved shape can be given to the elongated material 20 (see FIG. 4).
  • the moving unit 4 applies a tensile force to the elongated material 20 pressed against the split mold 10 by moving the grip 3 again to the outside in the longitudinal direction of the elongated material 20 2 modes).
  • the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension.
  • the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the split mold 10.
  • the elongated material 20 is plastically deformed along the plurality of split dies 10 of the die 2, and a curved shape is given to the elongated material 20.
  • the curvilinear shape is applied to the elongated material 20 by pressing against all of the plurality of divided dies 10, but in the present embodiment, the contact area is initially reduced Pressing the elongated material 20 only on the split mold 10 at the central portion to reduce the frictional force acting on the vicinity of the central portion of the elongated material 20 and to increase the tensile force transmitted to the vicinity of the central portion The amount of deformation generated near the central portion of the elongated material 20 is increased. Then, the stretch molding is performed again by the mold 2 on the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.
  • the stretch molding is performed in two steps using only the mold 2 without installing the second mold 7 on the molding surface 6 of the mold 2. That is, the moving direction of the grip portion 3 by the moving portion 4 is adjusted, and as shown by the solid line portion of the long material 20 in FIG. As shown by the two-dot chain line portion of the elongated material 20 of FIG. 6, by pressing the elongated material 20 over the entire surface in the longitudinal direction of the forming surface 6, as in the first and second embodiments, 2 The stretch material is applied to the elongated material 20 in stages.
  • the moving unit 4 moves the elongated material 20 gripped by the gripping unit 3 to the molding surface 6 side of the mold 2 by moving the gripping unit 3, and the elongated material 20 is molded into the die 2. Press to face 6. Further, the moving unit 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. .
  • the moving unit 4 applies a tensile force to the elongated material 20 by moving the gripping unit 3, and only the central portion of the molding surface 6 of the mold 2 is the elongated material 20.
  • the moving unit 4 applies a tensile force to the elongated material 20 by the gripping unit 3 while pressing the elongated material 20 on the entire surface of the molding surface 6 of the die 2.
  • the gripping unit 3 is moved.
  • the length of the central portion of the molding surface 6 in contact with the elongated material 20 is about 1/4 to 1/3 of the entire length of the molding surface 6.
  • switching between the first mode and the second mode is possible.
  • switching between the first mode and the second mode may be performed manually by the operator, or the amount of deformation of the elongated material 20 is detected to confirm that a predetermined amount of deformation is applied. It may be performed by the control device to shift from the first mode to the second mode at the same time.
  • the stretch forming method using the stretch forming apparatus 1 first, only the central part of the forming surface 6 of the mold 2 is elongated as shown by the solid line portion of the elongated material 20 of FIG.
  • the elongated material 20 gripped by the gripping unit 3 is moved so as to press the material 20, and the elongated material 20 is pressed against the central portion of the molding surface 6 of the mold 2.
  • the moving unit 4 moves the grip portion 3 to the outside in the longitudinal direction of the elongated material 20 to thereby apply a tensile force to the elongated material 20 pressed against the central portion of the molding surface 6 of the mold 2. Is given (first mode).
  • the elongated material 20 is prevented from coming into contact with the end portion of the molding surface 6 of the mold 2 other than the central portion.
  • the contact area of the elongated material 20 and the mold 2 becomes smaller than the contact area when the elongated material 20 and the entire surface of the mold 2 come in contact with each other. Is applied, the frictional force acting near the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
  • the moving unit 4 is moved while the gripping portion 3 grips the elongated material 20, and the elongated material 20 is made of the mold 2 as shown by the two-dot chain line portion of the elongated material 20 in FIG. Press the entire surface of the molding surface 6.
  • the moving unit 4 moves the gripping unit 3 to the outside in the longitudinal direction of the elongated material 20 to apply a tensile force to the elongated material 20 pressed against the entire surface of the molding surface 6 of the mold 2. Apply (second mode).
  • the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension.
  • the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the molding surface 6.
  • the elongated material 20 is plastically deformed along the entire surface of the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.
  • the entire shape of the molding material 6 is pressed against the entire surface of the molding surface 6 of the mold 2 to give a curved shape to the elongated material 20.
  • the elongated material 20 By pressing the elongated material 20 only to the central part of the molding surface 6 of the mold 2 to reduce the frictional force acting in the vicinity of the central part of the elongated material 20, the tensile force transmitted to the vicinity of the central part is increased. The amount of deformation generated near the central portion of the elongated material 20 is increased.
  • stretch molding is performed again on the entire surface of the molding surface 6 of the mold 2 with respect to the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.

Abstract

The objective of the present invention is to reduce unevenness in an amount of deformation of a central portion and an end portion of an elongate material being formed. A stretch forming device (1) is provided with a die (2) and gripping portions (3) which grip both end portions of an elongate material (20), wherein: the cross-sectional shape of the die (2) has a curved shape in which a central side of a forming surface (6) bulges; the length in a longitudinal direction of the elongate material (20) is less than that of the forming surface (6); a second die (7) having a second forming surface (8) along the forming surface (6) is installed removably on a central portion of the forming surface (6); and the stretch forming device (1) has a first mode in which, when the second die (7) has been installed on the forming surface (6), only the second die (7) is pressed against the elongate material (20) while a tensile force is applied to the elongate material (20) by the grip portions (3), and a second mode in which, when the second die (7) has been removed from the forming surface (6), the die (2) is pressed against the elongate material (20) while a tensile force is applied to the elongate material (20) by the gripping portions (3).

Description

ストレッチ成形装置及びストレッチ成形方法Stretch forming apparatus and stretch forming method
　本発明は、ストレッチ成形装置及びストレッチ成形方法に関するものである。 The present invention relates to a stretch molding apparatus and a stretch molding method.
　航空機の胴体や主翼等の航空機部品は、例えば板状のスキン、長尺状のフレーム及びストリンガーなどの構造部材から構成される。胴体及び主翼等は、曲面形状を有することから、フレーム及びストリンガーは、長手方向に沿って湾曲した曲線形状を有する。 Aircraft parts such as the fuselage and wings of an aircraft are composed of structural members such as plate-like skins, long frames and stringers. Since the fuselage, the wing and the like have a curved shape, the frame and the stringer have a curved shape which is curved along the longitudinal direction.
　アルミニウム合金製の長尺状材料に対して曲線形状を付与するため、従来、ロール成形装置によって焼きなまし（焼鈍）された材料（Ｏ材とも呼ばれる。）に対してロール成形を行って、Ｏ材を概略形状としている。その後、ロール成形によって得られたＯ材に対して溶体化処理を行って、Ｗ材とする。 In order to give a curvilinear shape to a long material made of aluminum alloy, the O material is roll-formed on a material (also called an O-material) that has been conventionally annealed (annealed) by a roll-forming apparatus. It has an approximate shape. Thereafter, solution treatment is performed on the O material obtained by roll forming to obtain W material.
　この場合、Ｗ材の長尺状材料の両端を引っ張りながら長尺状材料に対して金型を当てて、Ｗ材に対して曲線形状を更に付与するストレッチ成形を行う。これにより、長尺状材料に対して製品として要求される形状又はそれに近い曲率を付与する。 In this case, while drawing the both ends of the elongated material of W material, a mold is applied to the elongated material to perform stretch forming in which a curved shape is further given to the W material. This gives the elongated material the required curvature of the product or the shape required for the product.
　下記の特許文献１では、ストレッチ成形を行う成形装置において、複数のブロックによって成形面を形成し、各ブロックの位置を個々に成形方向に移動して、成形面の形状を変更できるようにし、かつ、成形中に長尺材に対して相対移動をしないで良好なストレッチ成形を行うことが開示されている。 In Patent Document 1 below, in a molding apparatus that performs stretch molding, a molding surface is formed by a plurality of blocks, and the position of each block is individually moved in the molding direction, so that the shape of the molding surface can be changed It is disclosed to perform good stretch molding without relative movement with respect to the long material during molding.
特開２００６－２３１３８０号公報JP, 2006-231380, A
　ストレッチ成形を行うと、被成形材料である長尺状材料の両端部近傍では、長尺状材料は、引っ張り力の作用によって、変形し伸長しやすい。一方、金型と接触する中央部分では、長尺状材料は、金型との間に作用する摩擦等の影響によって引っ張り力が減少し、変形量が少なく伸長しにくい。 When stretch molding is performed, in the vicinity of both ends of a long material which is a material to be molded, the long material is easily deformed and stretched by the action of a tensile force. On the other hand, in the central portion in contact with the mold, the elongated material has a reduced tensile force due to the influence of friction or the like acting with the mold, and the amount of deformation is small and it is difficult to elongate.
　ストレッチ成形の結果、ストレッチ成形前のロール成形や溶体化処理などの工程で導入された残留応力が低減されるが、中央部分の変形量が少ないため、中央部分は端部に比べて残留応力が低減されにくい。したがって、ストレッチ成形後にエッチングや穴明け等の切削加工が行われると、材料ごとに形状が変化し、ばらつきが生じやすいという課題がある。 As a result of stretch forming, the residual stress introduced in the steps of roll forming and solution treatment before stretch forming is reduced, but the amount of deformation in the central part is small, so the residual stress is smaller in the central part than at the end. It is hard to be reduced. Therefore, if cutting processing such as etching or drilling is performed after stretch molding, the shape changes for each material, and there is a problem that variation tends to occur.
　本発明は、このような事情に鑑みてなされたものであって、長尺状である被成形材料の中央部と端部の変形量の偏りを低減することが可能なストレッチ成形装置及びストレッチ成形方法を提供することを目的とする。 This invention is made in view of such a situation, Comprising: The stretch molding apparatus and stretch molding which can reduce the bias | inclination of the deformation amount of the center part of a molding material which is long shape, and an edge part Intended to provide a method.
　上記課題を解決するために、本発明のストレッチ成形装置及びストレッチ成形方法は以下の手段を採用する。
　すなわち、本発明の第１態様に係るストレッチ成形装置は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されており、前記被成形材料の長手方向に沿った長さが前記成形面よりも短く、前記成形面に沿った第２成形面を有する第２金型が、前記成形面の中央部に取り外し可能に設置され、前記第２金型が前記成形面に設置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第２金型のみが前記被成形材料を押し当てる第１モードと、前記第２金型が前記成形面から取り外されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第１金型が前記被成形材料を押し当てる第２モードとを有する。 In order to solve the above-mentioned subject, the stretch forming device and the stretch forming method of the present invention adopt the following means.
That is, the stretch forming apparatus according to the first aspect of the present invention comprises a mold and a gripping part for gripping both ends of the long material to be molded, and the cross-sectional shape of the mold is the molding surface The center side has an expanded curved shape, and the molding surface of the mold is formed to give a curved shape to the material to be molded, and the length along the longitudinal direction of the material to be molded Is shorter than the molding surface, and a second mold having a second molding surface along the molding surface is removably installed at the central portion of the molding surface, and the second mold is installed on the molding surface A first mode in which only the second mold presses the material to be molded while the holding surface applies a tensile force to the material to be molded; To the material to be molded by the grip While the tensile force application, and a second mode in which the first mold pressed against the object to be molded material.
　本発明の第２態様に係るストレッチ成形装置は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型は、前記被成形材料の長手方向に複数に分割され、個々に前記被成形材料側に対する位置を変更できる複数の分割金型を有し、前記複数の分割金型のうち中央部に設置された前記分割金型が、端部に設置された前記分割金型よりも前記被成形材料側に突出して配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部に配置された前記分割金型のみが前記被成形材料を押し当てる第１モードと、前記中央部と前記端部に配置された前記複数の分割金型が、前記被成形材料に対して曲線形状を付与するように配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部と前記端部に配置された前記複数の分割金型が前記被成形材料を押し当てる第２モードとを有する。 A stretch forming apparatus according to a second aspect of the present invention includes a mold and a gripping portion that grips both end portions of the long material to be molded, the mold being in the longitudinal direction of the material to be molded It has a plurality of divided molds which are divided into a plurality of pieces and whose positions relative to the molding material side can be individually changed, and among the plurality of divided molds, the divided molds installed at the center portion are installed at the end The split mold disposed in the central portion while applying a tensile force to the material to be molded by the holding portion when disposed so as to project to the side of the material to be molded more than the split molds being cut The first mode for pressing the material to be molded only, and the plurality of divided dies disposed at the central portion and the end portion are arranged to give a curved shape to the material to be molded When the material to be molded While applying tension force Tsu, and a second mode in which said plurality of split molds disposed on said end portion and the central portion is pressed against the object to be molded material.
　本発明の第３態様に係るストレッチ成形装置は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されており、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面の中央部のみが前記被成形材料を押し当てる第１モードと、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面全面が前記被成形材料を押し当てる第２モードとを有する。 The stretch molding apparatus according to the third aspect of the present invention comprises a mold and a grip portion for gripping both ends of the material to be molded which is long, and the cross-sectional shape of the mold is the center side of the molding surface The mold has a curved shape, and the molding surface of the mold is formed to give a curved shape to the material to be molded, and a tensile force is applied to the material to be molded by the grip portion. A first mode in which only the central portion of the molding surface of the mold presses the material to be molded while applying, and a tensile force is applied to the material to be molded by the gripping portion; The entire molding surface has a second mode in which the molding material is pressed.
　本発明の第４態様に係るストレッチ成形方法は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されたストレッチ成形装置を用いたストレッチ成形方法であり、前記被成形材料の長手方向に沿った長さが前記成形面よりも短く、前記成形面に沿った第２成形面を有する第２金型を、前記成形面の中央部に設置するステップと、前記第２金型が前記成形面に設置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第２金型のみが前記被成形材料を押し当てるステップと、前記第２金型が前記成形面から取り外されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型が前記被成形材料を押し当てるステップとを有する。 A stretch molding method according to a fourth aspect of the present invention comprises a mold and a grip portion for gripping both end portions of a long material to be molded, and the cross-sectional shape of the mold is the center side of the molding surface It is a stretch molding method using a stretch molding apparatus having a bulging curvilinear shape and the molding surface of the mold being formed to give a curvilinear shape to the material to be molded, the material to be molded Placing a second mold having a second molding surface along the molding surface and having a length along the longitudinal direction of the molding shorter than the molding surface at a central portion of the molding surface; A step of pressing only the second mold while pressing the material to be molded while applying a tensile force to the material to be molded by the grip when the mold is installed on the molding surface; When the mold is removed from the molding surface, the While applying a tensile force to the object to be molded material by part, and a step in which the mold is pressed against the object to be molded material.
　本発明の第５態様に係るストレッチ成形方法は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型は、前記被成形材料の長手方向に複数に分割され、個々に前記被成形材料側に対する位置を変更できる複数の分割金型を有するストレッチ成形装置を用いたストレッチ成形方法であり、前記複数の分割金型のうち中央部に設置された前記分割金型を、端部に設置された前記分割金型よりも前記被成形材料側に突出して配置するステップと、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部に配置された前記分割金型のみが前記被成形材料を押し当てるステップと、前記中央部と前記端部に配置された前記複数の分割金型が、前記被成形材料に対して曲線形状を付与するように配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部と前記端部に配置された前記複数の分割金型が前記被成形材料を押し当てるステップとを有する。 A stretch molding method according to a fifth aspect of the present invention comprises a mold and a gripping portion for gripping both end portions of the long material to be molded, wherein the mold is in the longitudinal direction of the material to be molded A stretch forming method using a stretch forming apparatus having a plurality of divided dies divided into a plurality of pieces and capable of individually changing the position with respect to the material to be molded, installed at a central portion among the plurality of divided dies. Placing the split mold on the side of the material to be molded with respect to the split mold installed at the end, and applying a tensile force to the material to be molded by the gripping portion, The step of pressing the material to be molded only by the divided mold disposed in the central portion, and the plurality of divided molds disposed at the central portion and the end portion have a curved shape with respect to the material to be molded Distributed to give And a plurality of divided dies disposed at the central portion and the end portion pressing the material to be molded while applying a tensile force to the material to be molded by the grip portion. Have.
　本発明の第６態様に係るストレッチ成形方法は、金型と、長尺状である被成形材料の両端部を把持する把持部とを備え、前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されたストレッチ成形装置を用いたストレッチ成形方法であり、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面の中央部のみが前記被成形材料を押し当てるステップと、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面全面が前記被成形材料を押し当てるステップとを有する。 A stretch molding method according to a sixth aspect of the present invention comprises a mold and a grip portion for gripping both end portions of the long material to be molded, and the cross-sectional shape of the mold is the center side of the molding surface It is a stretch molding method using a stretch molding apparatus having a bulging curvilinear shape, the molding surface of the mold being formed to give a curvilinear shape to the material to be molded, and the grip portion Applying a tensile force to the material to be molded while pressing only the central portion of the molding surface of the mold against the material to be molded; And, while applying, pressing the molding material on the entire molding surface of the mold.
　本発明によれば、長尺状である被成形材料の中央部と端部の変形量の偏りを低減することができ、中央部分近傍も端部と同様に残留応力が低減される。その結果、ストレッチ成形後にエッチングや穴明け等の切削加工を行ったとき、材料に生じる形状変化や、材料ごとのばらつきを減らすことができる。 According to the present invention, it is possible to reduce the deviation of the amount of deformation of the central portion and the end portion of the long material to be molded, and the residual stress in the vicinity of the central portion is also reduced similarly to the end portion. As a result, when cutting such as etching or drilling is performed after stretch molding, it is possible to reduce the shape change occurring in the material and the variation among the materials.
本発明の第１実施形態に係るストレッチ成形装置を示す概略構成図である。It is a schematic block diagram which shows the stretch molding apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係るストレッチ成形装置を示す概略構成図である。It is a schematic block diagram which shows the stretch molding apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係るストレッチ成形装置を示す概略構成図である。It is a schematic block diagram which shows the stretch molding apparatus which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るストレッチ成形装置を示す概略構成図である。It is a schematic block diagram which shows the stretch molding apparatus which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係るストレッチ成形装置の変形例を示す概略構成図である。It is a schematic block diagram which shows the modification of the stretch molding apparatus which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係るストレッチ成形装置を示す概略構成図である。It is a schematic block diagram which shows the stretch molding apparatus which concerns on 3rd Embodiment of this invention.
　以下に、本発明に係る実施形態について、図面を参照して説明する。
［第１実施形態］
　以下、本発明の第１実施形態について、図１及び図２を用いて説明する。
　本実施形態に係るストレッチ成形装置１は、被成形材料である長尺状材料２０に対して、金型２によってストレッチ成形を行う装置である。長尺状材料２０は、例えばアルミニウム合金製であり、航空機の胴体や主翼等の航空機部品を構成するフレーム及びストリンガーなどの構造部材として作製される材料である。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
First Embodiment
Hereinafter, a first embodiment of the present invention will be described using FIGS. 1 and 2.
The stretch forming apparatus 1 according to the present embodiment is an apparatus that performs stretch forming on a long material 20 that is a material to be molded using a mold 2. The elongated material 20 is made of, for example, an aluminum alloy, and is a material manufactured as a structural member such as a frame and a stringer that constitutes an aircraft component such as an aircraft fuselage or a wing.
　長尺状材料２０は、焼きなまし（焼鈍）された材料（Ｏ材）に対してロール成形が行われ、かつ、ロール成形によって得られたＯ材に対して溶体化処理が行われた材料（Ｗ材）である。または、長尺状材料２０は、焼きなましされた材料（Ｏ材）に対して溶体化処理を行って得られたＷ材に対してロール成形が行われた材料でもよい。 The elongated material 20 is a material (W material obtained by roll forming the annealed (annealed) material (O material) and solution treated with the O material obtained by roll forming (W Material). Alternatively, the elongated material 20 may be a material obtained by performing roll forming on a W material obtained by performing solution treatment on the annealed material (O material).
　ストレッチ成形では、長尺状材料２０の両端部をそれぞれ把持部３が把持し、引っ張り力を作用させながら、金型２に長尺状材料２０を押し付ける（又は長尺状材料２０に金型２を押し付ける）。そして、ストレッチ成形は、ロール成形によって曲線形状に形成された長尺状材料２０に対して塑性変形を行い、曲線形状を更に付与する。 In the stretch molding, the grips 3 respectively grip both ends of the elongated material 20 and press the elongated material 20 against the mold 2 while applying a tensile force (or the elongated material 20 to the mold 2 Press). And stretch molding carries out plastic deformation with respect to the elongate material 20 formed in the curve shape by roll forming, and further gives curve shape.
　ストレッチ成形装置１は、金型２と、把持部３と、移動部４と、操作部５などを備える。
　金型２は、被成形材料である長尺状材料２０の長手方向に沿って長い成形面６を有する。金型２の成形面６は、長尺状材料２０に対して曲線形状を付与するように形成されており、曲面を有する。金型２の断面形状は、成形面６の中央側が膨らんだ曲線形状であり、例えば、円弧又は楕円の一部である。 The stretch forming apparatus 1 includes a mold 2, a gripping unit 3, a moving unit 4, an operation unit 5 and the like.
The mold 2 has a long molding surface 6 along the longitudinal direction of the long material 20 which is a molding material. The molding surface 6 of the mold 2 is formed to give a curved shape to the elongated material 20, and has a curved surface. The cross-sectional shape of the mold 2 is a curved shape in which the center side of the molding surface 6 bulges, and is, for example, a part of a circular arc or an ellipse.
　把持部３は、長尺状材料２０の端部を把持するように構成されている。把持部３は、長尺状材料２０の両端部にそれぞれ一つずつ設置される。把持部３は、移動部４に接続されており、移動部４によって移動可能である。 The gripping portion 3 is configured to grip an end portion of the elongated material 20. The gripping portions 3 are respectively installed at both end portions of the elongated material 20. The gripping unit 3 is connected to the moving unit 4 and can be moved by the moving unit 4.
　本実施形態に係る金型２の成形面６の中央部には、第２金型７が取り外し可能に設置される。第２金型７は、長尺状材料２０の長手方向に沿った長さが成形面６よりも短く、成形面６に沿った第２成形面８を有する。第２成形面８は、例えば、金型２の成形面６と平行な曲面を有する。第２金型７の長さは、金型２の長さの１／４～１／３程度である。 The second mold 7 is removably installed at the central portion of the molding surface 6 of the mold 2 according to the present embodiment. The second mold 7 has a second molding surface 8 along the molding surface 6 whose length along the longitudinal direction of the elongated material 20 is shorter than the molding surface 6. The second molding surface 8 has, for example, a curved surface parallel to the molding surface 6 of the mold 2. The length of the second mold 7 is about 1/4 to 1/3 of the length of the mold 2.
　移動部４は、把持部３を移動することで、把持部３によって把持された長尺状材料２０を金型２の成形面６側へ移動させ、第２金型７が設置されていない場合、長尺状材料２０を金型２の成形面６へ押し付け、又は、第２金型７が設置されている場合、第２金型７の第２成形面８へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、金型２の成形面６、又は、第２金型７の第２成形面８へ押し付けられた長尺状材料２０に対して引っ張り力を付与する。 The moving unit 4 moves the elongated material 20 held by the holding unit 3 to the molding surface 6 side of the mold 2 by moving the holding unit 3, and the second mold 7 is not installed. The long material 20 is pressed against the molding surface 6 of the mold 2 or when the second mold 7 is installed, it is pressed against the second molding surface 8 of the second mold 7. Further, the moving unit 4 is pressed against the molding surface 6 of the mold 2 or the second molding surface 8 of the second mold 7 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. A tensile force is applied to the elongated material 20.
　操作部５は、作業者からの入力操作を受け付け、移動部４に対して操作信号を送信する。 The operation unit 5 receives an input operation from a worker and transmits an operation signal to the moving unit 4.
　なお、上述した説明では、移動部４が、把持部３を移動することで、把持部３によって把持された長尺状材料２０を金型２の成形面６側へ移動させるとしたが、本発明はこの例に限られず、金型２を移動させる移動部（図示せず。）によって、金型２を長尺状材料２０側へ移動させてもよい。 In the above description, the moving unit 4 moves the holding unit 3 to move the elongated material 20 held by the holding unit 3 toward the molding surface 6 of the mold 2. The invention is not limited to this example, and the mold 2 may be moved toward the elongated material 20 by a moving unit (not shown) for moving the mold 2.
　本実施形態に係るストレッチ成形装置１を用いたストレッチ成形方法では、まず、図１に示すように、金型２の成形面６に第２金型７を設置する。そして、把持部３によって把持された長尺状材料２０を移動させ、長尺状材料２０を第２金型７の第２成形面８へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、第２金型７の第２成形面８へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第１モード）。このとき、金型２の成形面６には、長尺状材料２０が接触しないようにする。 In the stretch molding method using the stretch molding apparatus 1 according to the present embodiment, first, as shown in FIG. 1, the second mold 7 is installed on the molding surface 6 of the mold 2. Then, the elongated material 20 gripped by the gripping unit 3 is moved to press the elongated material 20 against the second molding surface 8 of the second mold 7. In addition, the moving unit 4 pulls the elongated material 20 pressed against the second molding surface 8 of the second mold 7 by moving the gripping unit 3 to the outside in the longitudinal direction of the elongated material 20. Apply a force (first mode). At this time, the elongated material 20 is prevented from coming in contact with the molding surface 6 of the mold 2.
　これにより、第２金型７を設置しないときの長尺状材料２０と金型２との接触面積に比べて、長尺状材料２０と第２金型７の接触面積が小さくなるため、長尺状材料２０に引っ張り力が付与されたとき、長尺状材料２０の中央部近傍に作用する摩擦力が低減され、中央部近傍に伝達される引っ張り力が増加する。その結果、長尺状材料２０の中央部近傍に生じる変形量が増加する。 As a result, the contact area between the elongated material 20 and the second mold 7 becomes smaller than the contact area between the elongated material 20 and the mold 2 when the second mold 7 is not installed. When a tensile force is applied to the material 20, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
　次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。そして、把持部３によって把持された長尺状材料２０を移動させて、第２成形面８から長尺状材料２０を離間させ、成形面６から第２金型７を取り外す。 Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping portion 3 is moved to separate the elongated material 20 from the second molding surface 8, and the second mold 7 is removed from the molding surface 6.
　その後、把持部３によって把持された長尺状材料２０を移動させ、図２に示すように、長尺状材料２０を金型２の成形面６へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、金型２の成形面６へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第２モード）。次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。そして、把持部３によって把持された長尺状材料２０を移動させて、成形面６から長尺状材料２０を離間させる。 Thereafter, the elongated material 20 gripped by the gripping unit 3 is moved, and the elongated material 20 is pressed against the molding surface 6 of the mold 2 as shown in FIG. Further, the moving unit 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. (Second mode). Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the molding surface 6.
　これにより、長尺状材料２０が金型２の成形面６に沿って塑性変形され、長尺状材料２０に対して曲線形状が付与される。 As a result, the elongated material 20 is plastically deformed along the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.
　従来、ストレッチ成形の開始時から、金型２の成形面６に押し付けて長尺状材料２０に対して曲線形状を付与していたが、本実施形態では、初めに接触面積の小さい第２金型７の第２成形面８に長尺状材料２０を押し付けて、長尺状材料２０の中央部近傍に作用する摩擦力を低減し、中央部近傍に伝達される引っ張り力を増加させ、長尺状材料２０の中央部近傍に生じる変形量を増加させる。そして、従来に比べて変形量が多く付与された長尺状材料２０に対して、再度、金型２によってストレッチ成形が行われる。 Conventionally, from the start of the stretch molding, the curving shape is applied to the elongated material 20 by pressing against the molding surface 6 of the mold 2, but in the present embodiment, the second gold having a small contact area is first The elongated material 20 is pressed against the second molding surface 8 of the mold 7 to reduce the frictional force acting in the vicinity of the central portion of the elongated material 20 and to increase the tensile force transmitted to the vicinity of the central portion. The amount of deformation generated near the central portion of the material 20 is increased. Then, the stretch molding is performed again by the mold 2 on the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.
　このように２段階に分けてストレッチ成形が実施されることによって、長尺状材料２０の中央部近傍における残留応力を低減することができる。その結果、ストレッチ成形後にエッチングや穴明け等の切削加工を行ったときに生じる形状変化や、切削加工後の材料ごとのばらつきを小さくすることができる。また、既存の金型２を活用することができるため、金型を新たに製作する必要がない。 By performing stretch molding in two steps in this manner, residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the change in shape that occurs when cutting such as etching or drilling is performed after stretch forming, and the variation among materials after cutting. Moreover, since the existing mold 2 can be utilized, it is not necessary to newly manufacture a mold.
［第２実施形態］
　次に、本発明の第２実施形態について、図３及び図４を用いて説明する。なお、第１実施形態と重複する構成及び作用については詳細な説明を省略する。 Second Embodiment
Next, a second embodiment of the present invention will be described using FIGS. 3 and 4. In addition, detailed description is abbreviate | omitted about the structure and effect which overlap with 1st Embodiment.
　第１実施形態と異なり、本実施形態に係る金型２は、複数の分割金型１０を有する。すなわち、金型２は、被成形材料である長尺状材料２０の長手方向に複数に分割されている。そして、複数の分割金型１０は、個々に長尺状材料２０側に対する位置を変更できる。 Unlike the first embodiment, the mold 2 according to the present embodiment has a plurality of divided molds 10. That is, the mold 2 is divided into a plurality of pieces in the longitudinal direction of the elongated material 20 which is a material to be molded. And a plurality of division dies 10 can change the position to the long material 20 side individually, respectively.
　個々の分割金型１０における長尺状材料２０との接触部分は、図３及び図４に示すように、曲面を有する。 The contact portion with the elongated material 20 in each of the divided molds 10 has a curved surface as shown in FIGS. 3 and 4.
　本実施形態では、分割金型１０を移動する移動部１１を更に備える。移動部１１によって、各分割金型１０の位置を変更することによって、図３に示すように、各分割金型１０を配置することも可能である（第１モード）。すなわち、第１実施形態の金型２の成形面６に第２金型７を設置した状態のように、複数の分割金型１０のうち中央部に設置された分割金型１０が、端部に配置された分割金型１０よりも長尺状材料２０側に突出して配置することができる。分割金型１０を突出させる中央部の長さは、金型２の全体長さの１／４～１／３程度である。 In the present embodiment, a moving unit 11 for moving the split mold 10 is further provided. By changing the position of each divided mold 10 by the moving unit 11, as shown in FIG. 3, it is also possible to arrange each divided mold 10 (first mode). That is, as in the state in which the second mold 7 is installed on the molding surface 6 of the mold 2 of the first embodiment, the split mold 10 installed at the center of the plurality of split molds 10 is an end portion It can be disposed so as to project on the side of the elongated material 20 more than the divided mold 10 disposed in the above. The length of the central portion from which the split mold 10 protrudes is about 1/4 to 1/3 of the entire length of the mold 2.
　また、移動部１１によって、各分割金型１０の位置を変更することによって、図４に示すように、中央側が膨らんだ曲線形状に、複数の分割金型１０を配置できる（第２モード）。これにより、第１実施形態の金型２の成形面６のように、複数の分割金型１０が、長尺状材料２０に対して曲線形状を付与できる。 Further, by changing the positions of the divided dies 10 by the moving unit 11, as shown in FIG. 4, it is possible to arrange the plurality of divided dies 10 in a curved shape in which the center side bulges (second mode). Thereby, like the molding surface 6 of the mold 2 of the first embodiment, the plurality of divided molds 10 can give the elongated material 20 a curved shape.
　移動部１１により各分割金型１０の配置位置を調整することによって、第１モードと第２モードの切り替えが可能である。なお、第１モードと第２モードの切り替えは、作業者によって手動で行われてもよいし、長尺状材料２０の変形量を検出して、所定の変形量が付与されたことが確認されたときに第１モードから第２モードへ移行するように制御装置によって行われてもよい。 By adjusting the arrangement position of each divided mold 10 by the moving unit 11, switching between the first mode and the second mode is possible. Note that switching between the first mode and the second mode may be performed manually by the operator, or the amount of deformation of the elongated material 20 is detected to confirm that a predetermined amount of deformation is applied. It may be performed by the control device to shift from the first mode to the second mode at the same time.
　なお、図３及び図４に示すように、分割金型１０は、中央部と端部において、それぞれ二つ以上に分割されて細かく曲線形状を形成できるようにしてもよいし、図５に示すように、分割金型１０は、中央部において一つ、端部においてそれぞれ一つずつの合計三つであってもよい。また、両者の組み合わせも可能である。 As shown in FIGS. 3 and 4, the split mold 10 may be split into two or more at the central portion and the end portion, respectively, to form a finely curved shape, as shown in FIG. Thus, the split mold 10 may have a total of three in the center, one at each end. Moreover, the combination of both is also possible.
　本実施形態に係るストレッチ成形装置１を用いたストレッチ成形方法では、まず、図３に示すように、複数の分割金型１０のうち中央部に設置された分割金型１０を、端部に配置された分割金型１０よりも長尺状材料２０側に突出させて配置する。そして、把持部３によって把持された長尺状材料２０を移動させ、長尺状材料２０を中央部で突出して配置された分割金型１０へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、分割金型１０へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第１モード）。このとき、端部に配置された分割金型１０には、長尺状材料２０が接触しないようにする。 In the stretch molding method using the stretch molding apparatus 1 according to the present embodiment, first, as shown in FIG. 3, among the plurality of split molds 10, the split molds 10 installed at the central part are disposed at the end parts. It is made to project and arrange | position to the elongate material 20 side rather than the division | segmentation metal mold | die 10 made. Then, the elongated material 20 gripped by the gripping unit 3 is moved, and the elongated material 20 is pressed against the split mold 10 disposed so as to protrude at the central portion. Further, the moving unit 4 applies a tensile force to the elongated material 20 pressed against the split mold 10 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20 (first process). mode). At this time, the elongated material 20 is prevented from coming into contact with the split mold 10 disposed at the end.
　これにより、分割金型１０全てを押し付けるときの長尺状材料２０と金型２との接触面積に比べて、長尺状材料２０と分割金型１０の接触面積が小さくなるため、長尺状材料２０に引っ張り力が付与されたとき、長尺状材料２０の中央部近傍に作用する摩擦力が低減され、中央部近傍に伝達される引っ張り力が増加する。その結果、長尺状材料２０の中央部近傍に生じる変形量が増加する。 As a result, the contact area between the elongated material 20 and the divided mold 10 is smaller than the contact area between the elongated material 20 and the mold 2 when pressing all the divided molds 10, so the elongated shape When a tensile force is applied to the material 20, the frictional force acting on the vicinity of the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the vicinity of the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
　次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。そして、各分割金型１０を移動させて、長尺状材料２０に対して曲線形状を付与できるように、中央側が膨らんだ曲線形状に複数の分割金型１０を配置する（図４参照）。 Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, each divided mold 10 is moved, and the plurality of divided molds 10 are arranged in a curved shape in which the central side bulges so that a curved shape can be given to the elongated material 20 (see FIG. 4).
　その後、移動部４は、長尺状材料２０の長手方向外側へ把持部３を再び移動することで、分割金型１０へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第２モード）。次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。そして、把持部３によって把持された長尺状材料２０を移動させて、分割金型１０から長尺状材料２０を離間させる。 Thereafter, the moving unit 4 applies a tensile force to the elongated material 20 pressed against the split mold 10 by moving the grip 3 again to the outside in the longitudinal direction of the elongated material 20 2 modes). Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the split mold 10.
　これにより、長尺状材料２０が金型２の複数の分割金型１０に沿って塑性変形され、長尺状材料２０に対して曲線形状が付与される。 As a result, the elongated material 20 is plastically deformed along the plurality of split dies 10 of the die 2, and a curved shape is given to the elongated material 20.
　従来、ストレッチ成形の開始時から、すべての複数の分割金型１０に押し付けて長尺状材料２０に対して曲線形状を付与していたが、本実施形態では、初めに接触面積が小さくなるように中央部の分割金型１０のみに長尺状材料２０を押し付けて、長尺状材料２０の中央部近傍に作用する摩擦力を低減し、中央部近傍に伝達される引っ張り力を増加させ、長尺状材料２０の中央部近傍に生じる変形量を増加させる。そして、従来に比べて変形量が多く付与された長尺状材料２０に対して、再度、金型２によってストレッチ成形が行われる。 Conventionally, from the start of stretch molding, the curvilinear shape is applied to the elongated material 20 by pressing against all of the plurality of divided dies 10, but in the present embodiment, the contact area is initially reduced Pressing the elongated material 20 only on the split mold 10 at the central portion to reduce the frictional force acting on the vicinity of the central portion of the elongated material 20 and to increase the tensile force transmitted to the vicinity of the central portion The amount of deformation generated near the central portion of the elongated material 20 is increased. Then, the stretch molding is performed again by the mold 2 on the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.
　このように２段階に分けてストレッチ成形が実施されることによって、長尺状材料２０の中央部近傍における残留応力を低減することができる。その結果、ストレッチ成形後にエッチングや穴明け等の切削加工を行ったときに生じる形状変化や、切削加工後の材料ごとのばらつきを小さくすることができる。また、第１実施形態と異なり、第２金型７を取り外すためにかかる時間が不要になり、かつ、金型形状の変更を手動ではなく機械によって自動的に実施することもできる。 By performing stretch molding in two steps in this manner, residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the change in shape that occurs when cutting such as etching or drilling is performed after stretch forming, and the variation among materials after cutting. Further, unlike the first embodiment, the time taken to remove the second mold 7 is not required, and the change of the shape of the mold can be performed automatically by a machine instead of manually.
［第３実施形態］
　次に、本発明の第３実施形態について、図６を用いて説明する。なお、第１実施形態と重複する構成及び作用については詳細な説明を省略する。 Third Embodiment
Next, a third embodiment of the present invention will be described using FIG. In addition, detailed description is abbreviate | omitted about the structure and effect which overlap with 1st Embodiment.
　本実施形態では、第１実施形態と異なり、金型２の成形面６に第２金型７を設置せずに、金型２のみを用いて、２段階に分けてストレッチ成形を実施する。すなわち、移動部４による把持部３の移動方向を調整して、図６の長尺状材料２０の実線部分で示すように、成形面６の中央部のみに長尺状材料２０を押し付けたり、図６の長尺状材料２０の二点鎖線部分で示すように、成形面６の長手方向全面にわたって長尺状材料２０を押し付けたりすることによって、第１及び第２実施形態と同様に、２段階に分けて長尺状材料２０に対してストレッチ成形を施す。 In the present embodiment, unlike the first embodiment, the stretch molding is performed in two steps using only the mold 2 without installing the second mold 7 on the molding surface 6 of the mold 2. That is, the moving direction of the grip portion 3 by the moving portion 4 is adjusted, and as shown by the solid line portion of the long material 20 in FIG. As shown by the two-dot chain line portion of the elongated material 20 of FIG. 6, by pressing the elongated material 20 over the entire surface in the longitudinal direction of the forming surface 6, as in the first and second embodiments, 2 The stretch material is applied to the elongated material 20 in stages.
　移動部４は、把持部３を移動することで、把持部３によって把持された長尺状材料２０を金型２の成形面６側へ移動させ、長尺状材料２０を金型２の成形面６へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、金型２の成形面６へ押し付けられた長尺状材料２０に対して引っ張り力を付与する。 The moving unit 4 moves the elongated material 20 gripped by the gripping unit 3 to the molding surface 6 side of the mold 2 by moving the gripping unit 3, and the elongated material 20 is molded into the die 2. Press to face 6. Further, the moving unit 4 applies a tensile force to the elongated material 20 pressed against the molding surface 6 of the mold 2 by moving the grip 3 to the outside in the longitudinal direction of the elongated material 20. .
　移動部４は、第１モードでは、把持部３を移動することによって長尺状材料２０に対して引っ張り力を付与しつつ、金型２の成形面６の中央部のみが長尺状材料２０を押し当てるように、把持部３を移動させる。移動部４は、第２モードでは、把持部３によって長尺状材料２０に対して引っ張り力を付与しつつ、金型２の成形面６の全面が長尺状材料２０を押し当てるように、把持部３を移動させる。第１モードにおいて、長尺状材料２０を接触させる成形面６の中央部の長さは、成形面６の全体長さの１／４～１／３程度である。 In the first mode, the moving unit 4 applies a tensile force to the elongated material 20 by moving the gripping unit 3, and only the central portion of the molding surface 6 of the mold 2 is the elongated material 20. To move the grip 3. In the second mode, the moving unit 4 applies a tensile force to the elongated material 20 by the gripping unit 3 while pressing the elongated material 20 on the entire surface of the molding surface 6 of the die 2. The gripping unit 3 is moved. In the first mode, the length of the central portion of the molding surface 6 in contact with the elongated material 20 is about 1/4 to 1/3 of the entire length of the molding surface 6.
　移動部４による把持部３の移動方向を調整することによって、第１モードと第２モードの切り替えが可能である。なお、第１モードと第２モードの切り替えは、作業者によって手動で行われてもよいし、長尺状材料２０の変形量を検出して、所定の変形量が付与されたことが確認されたときに第１モードから第２モードへ移行するように制御装置によって行われてもよい。 By adjusting the moving direction of the gripping unit 3 by the moving unit 4, switching between the first mode and the second mode is possible. Note that switching between the first mode and the second mode may be performed manually by the operator, or the amount of deformation of the elongated material 20 is detected to confirm that a predetermined amount of deformation is applied. It may be performed by the control device to shift from the first mode to the second mode at the same time.
　本実施形態に係るストレッチ成形装置１を用いたストレッチ成形方法では、まず、図６の長尺状材料２０の実線部分で示すように、金型２の成形面６の中央部のみが長尺状材料２０を押し当てるように、把持部３によって把持された長尺状材料２０を移動させ、長尺状材料２０を金型２の成形面６の中央部へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、金型２の成形面６の中央部へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第１モード）。このとき、金型２の成形面６の中央部以外の端部には、長尺状材料２０が接触しないようにする。 In the stretch forming method using the stretch forming apparatus 1 according to the present embodiment, first, only the central part of the forming surface 6 of the mold 2 is elongated as shown by the solid line portion of the elongated material 20 of FIG. The elongated material 20 gripped by the gripping unit 3 is moved so as to press the material 20, and the elongated material 20 is pressed against the central portion of the molding surface 6 of the mold 2. In addition, the moving unit 4 moves the grip portion 3 to the outside in the longitudinal direction of the elongated material 20 to thereby apply a tensile force to the elongated material 20 pressed against the central portion of the molding surface 6 of the mold 2. Is given (first mode). At this time, the elongated material 20 is prevented from coming into contact with the end portion of the molding surface 6 of the mold 2 other than the central portion.
　これにより、長尺状材料２０と金型２の全面が接触するときの接触面積に比べて、長尺状材料２０と金型２の接触面積が小さくなるため、長尺状材料２０に引っ張り力が付与されたとき、長尺状材料２０の中央部近傍に作用する摩擦力が低減され、中央部に伝達される引っ張り力が増加する。その結果、長尺状材料２０の中央部近傍に生じる変形量が増加する。 As a result, the contact area of the elongated material 20 and the mold 2 becomes smaller than the contact area when the elongated material 20 and the entire surface of the mold 2 come in contact with each other. Is applied, the frictional force acting near the central portion of the elongated material 20 is reduced, and the tensile force transmitted to the central portion is increased. As a result, the amount of deformation generated in the vicinity of the central portion of the elongated material 20 is increased.
　次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。 Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension.
　その後、把持部３が長尺状材料２０を把持したまま移動部４を移動させ、図６の長尺状材料２０の二点鎖線部分で示すように、長尺状材料２０を金型２の成形面６の全面へ押し付ける。また、移動部４は、長尺状材料２０の長手方向外側へ把持部３を移動することで、金型２の成形面６の全面へ押し付けられた長尺状材料２０に対して引っ張り力を付与する（第２モード）。次に、移動部４において検出された引っ張り方向の移動量に基づいて、所定の変形量が付与されたことが確認された場合、移動部４の移動を停止して、長尺状材料２０に対する引っ張り力の付与を停止する。そして、把持部３によって把持された長尺状材料２０を移動させて、成形面６から長尺状材料２０を離間させる。 Thereafter, the moving unit 4 is moved while the gripping portion 3 grips the elongated material 20, and the elongated material 20 is made of the mold 2 as shown by the two-dot chain line portion of the elongated material 20 in FIG. Press the entire surface of the molding surface 6. In addition, the moving unit 4 moves the gripping unit 3 to the outside in the longitudinal direction of the elongated material 20 to apply a tensile force to the elongated material 20 pressed against the entire surface of the molding surface 6 of the mold 2. Apply (second mode). Next, when it is confirmed that a predetermined amount of deformation has been imparted based on the amount of movement in the pulling direction detected by the moving portion 4, the movement of the moving portion 4 is stopped and the elongated material 20 is moved. Stop applying tension. Then, the elongated material 20 gripped by the gripping unit 3 is moved to separate the elongated material 20 from the molding surface 6.
　これにより、長尺状材料２０が金型２の成形面６の全面に沿って塑性変形され、長尺状材料２０に対して曲線形状が付与される。 As a result, the elongated material 20 is plastically deformed along the entire surface of the molding surface 6 of the mold 2, and a curved shape is given to the elongated material 20.
　従来、ストレッチ成形の開始時から、金型２の成形面６の全面に押し付けて長尺状材料２０に対して曲線形状を付与していたが、本実施形態では、初めに接触面積の小さい金型２の成形面６の中央部のみに長尺状材料２０を押し付けて、長尺状材料２０の中央部近傍に作用する摩擦力を低減し、中央部近傍に伝達される引っ張り力を増加させ、長尺状材料２０の中央部近傍に生じる変形量を増加させる。そして、従来に比べて変形量が多く付与された長尺状材料２０に対して、再度、金型２の成形面６の全面によってストレッチ成形が行われる。 Conventionally, from the start of the stretch molding, the entire shape of the molding material 6 is pressed against the entire surface of the molding surface 6 of the mold 2 to give a curved shape to the elongated material 20. By pressing the elongated material 20 only to the central part of the molding surface 6 of the mold 2 to reduce the frictional force acting in the vicinity of the central part of the elongated material 20, the tensile force transmitted to the vicinity of the central part is increased. The amount of deformation generated near the central portion of the elongated material 20 is increased. Then, stretch molding is performed again on the entire surface of the molding surface 6 of the mold 2 with respect to the elongated material 20 to which a large amount of deformation is applied as compared with the conventional case.
　このように２段階に分けてストレッチ成形が実施されることによって、長尺状材料２０の中央部近傍における残留応力を低減することができる。その結果、ストレッチ成形後にエッチングや穴明け等の切削加工を行ったときに生じる形状変化や、切削加工後の材料ごとのばらつきを小さくすることができる。また、既存の金型２を活用することができるため、金型を新たに製作する必要がない。 By performing stretch molding in two steps in this manner, residual stress in the vicinity of the central portion of the elongated material 20 can be reduced. As a result, it is possible to reduce the change in shape that occurs when cutting such as etching or drilling is performed after stretch forming, and the variation among materials after cutting. Moreover, since the existing mold 2 can be utilized, it is not necessary to newly manufacture a mold.
１　　：ストレッチ成形装置
２　　：金型
３　　：把持部
４　　：移動部
５　　：操作部
６　　：成形面
７　　：第２金型
８　　：第２成形面
１０　：分割金型
１１　：移動部
２０　：長尺状材料 DESCRIPTION OF SYMBOLS 1: Stretch molding apparatus 2: Mold 3: Gripping part 4: Moving part 5: Operation part 6: Molding surface 7: 2nd mold 8: 2nd molding surface 10: Division mold 11: Moving part 20: Long length Material

Claims (6)

  1. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されており、
    　前記被成形材料の長手方向に沿った長さが前記成形面よりも短く、前記成形面に沿った第２成形面を有する第２金型が、前記成形面の中央部に取り外し可能に設置され、
    　前記第２金型が前記成形面に設置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第２金型のみが前記被成形材料を押し当てる第１モードと、
    　前記第２金型が前記成形面から取り外されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第１金型が前記被成形材料を押し当てる第２モードとを有するストレッチ成形装置。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The cross-sectional shape of the mold has a curved shape in which the center side of the molding surface is expanded, and the molding surface of the mold is formed to give a curved shape to the material to be molded,
    The second mold having a length along the longitudinal direction of the material to be molded shorter than the molding surface and having a second molding surface along the molding surface is removably installed at the central portion of the molding surface. ,
    A first mode in which only the second mold presses the material to be molded while the holding portion applies a tensile force to the material to be molded when the second mold is installed on the molding surface When,
    A second mode in which the first mold presses the molding material while the holding portion applies a tensile force to the molding material when the second mold is detached from the molding surface; Having a stretch forming device.
  2. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型は、前記被成形材料の長手方向に複数に分割され、個々に前記被成形材料側に対する位置を変更できる複数の分割金型を有し、
    　前記複数の分割金型のうち中央部に設置された前記分割金型が、端部に設置された前記分割金型よりも前記被成形材料側に突出して配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部に配置された前記分割金型のみが前記被成形材料を押し当てる第１モードと、
    　前記中央部と前記端部に配置された前記複数の分割金型が、前記被成形材料に対して曲線形状を付与するように配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部と前記端部に配置された前記複数の分割金型が前記被成形材料を押し当てる第２モードとを有するストレッチ成形装置。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The mold has a plurality of divided molds which are divided into a plurality of pieces in the longitudinal direction of the material to be molded, and which can individually change their positions relative to the side of the material to be molded,
    When the split mold installed in the center of the plurality of split molds is disposed so as to project more toward the material to be molded than the split mold installed at the end, the grip section A first mode in which only the divided mold disposed in the central portion presses the material to be molded while applying a tensile force to the material to be molded;
    When the plurality of divided dies disposed at the central portion and the end portion are disposed to give a curved shape to the material to be molded, the holding portion pulls the material to be molded against the material to be molded A stretch forming device having a second mode in which the plurality of divided dies disposed at the central portion and the end portion press the material to be molded while applying a force.
  3. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されており、
    　前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面の中央部のみが前記被成形材料を押し当てる第１モードと、
    　前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面全面が前記被成形材料を押し当てる第２モードとを有するストレッチ成形装置。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The cross-sectional shape of the mold has a curved shape in which the center side of the molding surface is expanded, and the molding surface of the mold is formed to give a curved shape to the material to be molded,
    A first mode in which only the central portion of the molding surface of the mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion;
    A stretch forming device having a second mode in which the entire molding surface of the mold presses the material to be molded while applying a tensile force to the material to be molded by the grip portion.
  4. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されたストレッチ成形装置を用いたストレッチ成形方法であり、
    　前記被成形材料の長手方向に沿った長さが前記成形面よりも短く、前記成形面に沿った第２成形面を有する第２金型を、前記成形面の中央部に設置するステップと、
    　前記第２金型が前記成形面に設置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記第２金型のみが前記被成形材料を押し当てるステップと、
    　前記第２金型が前記成形面から取り外されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型が前記被成形材料を押し当てるステップと、
    を有するストレッチ成形方法。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The cross-sectional shape of the mold has a curved shape in which the center side of the molding surface is expanded, and the molding surface of the mold is a stretch forming device formed to give a curved shape to the material to be molded Stretch molding method using
    Installing a second mold having a second molding surface along a length of the material to be molded that is shorter than the molding surface and having a second molding surface along the molding surface at a central portion of the molding surface;
    When the second mold is installed on the molding surface, the gripping portion applies a tensile force to the material to be molded, and only the second mold presses the material to be molded;
    When the second mold is removed from the molding surface, the mold presses the molding material while applying a tensile force to the molding material by the holding portion;
    Having a stretch molding method.
  5. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型は、前記被成形材料の長手方向に複数に分割され、個々に前記被成形材料側に対する位置を変更できる複数の分割金型を有するストレッチ成形装置を用いたストレッチ成形方法であり、
    　前記複数の分割金型のうち中央部に設置された前記分割金型を、端部に設置された前記分割金型よりも前記被成形材料側に突出して配置するステップと、
    　前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部に配置された前記分割金型のみが前記被成形材料を押し当てるステップと、
    　前記中央部と前記端部に配置された前記複数の分割金型が、前記被成形材料に対して曲線形状を付与するように配置されたとき、前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記中央部と前記端部に配置された前記複数の分割金型が前記被成形材料を押し当てるステップと、
    を有するストレッチ成形方法。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The mold is a stretch forming method using a stretch forming apparatus having a plurality of divided molds which are divided into a plurality of pieces in the longitudinal direction of the material to be molded and which can individually change the position with respect to the material to be molded;
    Arranging the split mold installed in the center of the plurality of split molds so as to project more toward the material to be molded than the split mold installed at an end;
    Applying a tensile force to the material to be molded by the holding portion, and pressing the material to be molded only at the divided mold disposed at the central portion;
    When the plurality of divided dies disposed at the central portion and the end portion are disposed to give a curved shape to the material to be molded, the holding portion pulls the material to be molded against the material to be molded Applying a force while the plurality of divided dies disposed at the central portion and the end portion press the material to be molded;
    Having a stretch molding method.
  6. 　金型と、
    　長尺状である被成形材料の両端部を把持する把持部と、
    を備え、
    　前記金型の断面形状は、成形面の中央側が膨らんだ曲線形状を有し、前記金型の前記成形面は、前記被成形材料に対して曲線形状を付与するように形成されたストレッチ成形装置を用いたストレッチ成形方法であり、
    　前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面の中央部のみが前記被成形材料を押し当てるステップと、
    　前記把持部によって前記被成形材料に対して引っ張り力を付与しつつ、前記金型の前記成形面全面が前記被成形材料を押し当てるステップと、
    を有するストレッチ成形方法。     Mold and
    A gripping portion that grips both end portions of the elongated material to be molded;
    Equipped with
    The cross-sectional shape of the mold has a curved shape in which the center side of the molding surface is expanded, and the molding surface of the mold is a stretch forming device formed to give a curved shape to the material to be molded Stretch molding method using
    Applying a tensile force to the material to be molded by the holding portion, and pressing only the central portion of the molding surface of the mold with the material to be molded;
    Applying a tensile force to the material to be molded by the holding part, and pressing the material to be molded with the entire molding surface of the mold;
    Having a stretch molding method.
PCT/JP2017/035357 2017-09-28 2017-09-28 Stretch forming device and stretch forming method WO2019064462A1 (en)

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