WO2013153683A1 - 曲がり形状を有するフランジレス閉断面構造部品の製造方法及び装置 - Google Patents
曲がり形状を有するフランジレス閉断面構造部品の製造方法及び装置 Download PDFInfo
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- WO2013153683A1 WO2013153683A1 PCT/JP2012/060644 JP2012060644W WO2013153683A1 WO 2013153683 A1 WO2013153683 A1 WO 2013153683A1 JP 2012060644 W JP2012060644 W JP 2012060644W WO 2013153683 A1 WO2013153683 A1 WO 2013153683A1
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/025—Stamping using rigid devices or tools for tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/14—Making tubes from double flat material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
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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
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
- B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
-
- 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
- B21D5/086—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 closed hollow profiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/08—Bending by altering the thickness of part of the cross-section of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- 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
- B21D11/14—Twisting
Definitions
- the present invention relates to a method and an apparatus for manufacturing a flangeless closed cross-section structure part having a bent shape.
- parts such as automobiles, home appliances, and other fields that have been manufactured by joining two parts that have been individually molded to form a closed cross-section, bending to reduce weight, improve impact characteristics, and improve rigidity performance
- the present invention relates to a method and an apparatus for manufacturing a flangeless closed cross-section structure part having a curved shape, which can advantageously give an irregular cross-sectional shape over the entire length of the part.
- Patent Document 1 a high-tensile steel sheet is roll-formed to produce a formed body having a constant cross-sectional shape, and then the formed body is induction-hardened and further has a constant curvature in its longitudinal direction (direction perpendicular to the cross-section).
- a technique for manufacturing a bumper reinforcement as a shock absorber for a vehicle by bending into a circular arc shape is described.
- Patent Document 2 is provided with a pair of rotating rolls arranged so as to sandwich the conveyance path of the thin metal plate and a rotating roll arranged below the pair of rotating rolls, and the pair of rotating rolls is variable in the roll interval.
- a roll forming apparatus that can move up and down the disposed rotating rolls, and a part manufacturing method in the apparatus, when a part of a long thin metal plate is conveyed between the pair of rotating rolls, A technique for manufacturing a roll-formed part that does not have the same cross section in the longitudinal direction by changing the roll interval and raising and lowering a rotating roll installed below so as to locally deform the metal sheet being conveyed. Is described.
- JP 2008-120227 A Japanese Patent Laid-Open No. 2007-30023
- a closed cross-section part having a constant cross-sectional shape is formed by general roll forming, and then induction-quenched, and further, a curvature is given by three bending pieces to produce a bent closed cross-section part.
- Patent Document 2 uses a forming apparatus with a rotating roll for changing the cross-sectional shape in the longitudinal direction of the part below the pair of rotating rolls. Although it is a molding technique that makes it possible to change the cross-sectional shape in the longitudinal direction, it is impossible to impart a curved shape in the longitudinal direction at the same time.
- the cross-sectional shape (specifically, the cross-sectional shape perpendicular to the component longitudinal direction, that is, the cross-sectional shape of the component short direction) is changed in the component longitudinal direction, and the bending in the component longitudinal direction ( Or, furthermore, the three-dimensional shape imparting torsion) was impossible to proceed at the same time, so the cross-section of each part and the three-dimensional shape impartation had to be made into separate molding processes, It was costing minutes.
- a high-strength steel plate is used as a material for weight reduction, molding defects are likely to occur in bending after the cross-section of each part of the part is deformed.
- the inventors have intensively studied in order to solve the above-mentioned problems.
- the flange-less closed cross-section structure part having a deformed cross-sectional shape that is bent in the longitudinal direction of the part from two metal plates is deformed in each cross-section of the part.
- Means that can be manufactured in the molding process in which the formation and the formation of the three-dimensional shape proceed at the same time have been found and the present invention has been made.
- the present invention is as follows. (1) A method of manufacturing a flangeless closed cross-section structural component having a modified cross-sectional shape having a bent portion and a welded portion in the longitudinal direction of the component from two metal plates, Two metal plates with plate longitudinal direction bending corresponding to the component longitudinal direction bending and corresponding to both ends of the plate width at the part welding part are folded at the plate part corresponding to the non-weld bending part in the part cross section. A first step of press-molding so that The two metal plates after the press forming are overlapped vertically so that the convex side becomes the outside, and the left ends of the width and the right ends are welded in the longitudinal direction to form a welded portion, thereby providing a closed cross section.
- a second step of structuring the structure The obtained closed cross-section structure is guided and transported by a pair of left and right rotating rolls or further lower rotating rolls, and the folds and the folds are changed by changing the roll interval of the rotating rolls or raising and lowering the rotating rolls.
- a third method of manufacturing a flangeless closed cross-section structure component comprising: a third step of forming a three-dimensional shape with a welded portion as a starting point to obtain a target-shaped component.
- a press molding machine that press-molds so that The two metal plates after the press forming are overlapped vertically so that the convex side becomes the outside, and the left ends of the width and the right ends are welded in the longitudinal direction to form a welded portion, thereby providing a closed cross section.
- a welding machine with a structure The obtained closed cross-section structure is guided and transported by a pair of left and right rotating rolls or further lower rotating rolls, and the folds and the folds are changed by changing the roll interval of the rotating rolls or raising and lowering the rotating rolls.
- An apparatus for manufacturing a flangeless closed cross-section structure part comprising: a roll forming machine that forms a three-dimensional shape with a welded portion as a starting point to form a part having a target shape.
- the present invention it is possible to impart a bending in the longitudinal direction of a part and its vertical direction, that is, a three-dimensional shape, by changing the cross-sectional shape, and manufacturing by reducing the number of molds and the assembly process.
- the cost can be greatly reduced by the effect of process simplification.
- it is possible to obtain a predetermined shape mainly by bending it becomes easy to manufacture parts made of ultra-high-strength steel sheets, and further weight reduction can be achieved by eliminating flanges.
- FIG. 2 is a schematic three-dimensional view showing an example of a part (a flangeless closed section structure part having a curved shape) 10 to be manufactured by the present invention.
- the cross-sectional shape (meaning the cross-sectional shape in the short direction, hereinafter the same) is a quadrangle and has a bend in the longitudinal direction, and the cross-sectional shape is different at the start and end portions in the longitudinal direction. (Ie, it is a variant).
- the side length of the start end of the rectangular cross section is 30 mm, the length of one end of the end is 20 mm, the total length in the longitudinal direction (shortest distance between both ends in the length direction) is 300 mm, the curvature radius of the bend is 400 mm at the start end, and 400 mm at the end. It is a shape in which the direction of bending is reversed left and right at the center in the longitudinal direction of the part (position 150 mm from both ends in the longitudinal direction). Of the two pairs of vertices at the diagonal positions of the quadrangle, one pair forms a welded portion 11 and the other pair forms a non-welded bent portion 12. There is no flange.
- FIG. 1 is an explanatory view of a manufacturing process according to the present invention.
- the part in the example of FIG. 2 is the part of Example 1 shown in FIG.
- the two metal plates 1 a and 1 b have two bending lines on the width end side corresponding to the welded portion 11 of the component 10 in order to represent the plate longitudinal bending corresponding to the component longitudinal bending.
- the metal plate 1a is provided with a bend line (B) (B), and the metal plate 1b is provided with a bend line (B ') (B').
- a bending line (A) is provided for the metal plate 1a
- a bending line (A ') is provided for the metal plate 1b.
- the first step is a preforming step.
- a press molding machine 20 having a punch 3 and a die 4
- a bending line (A) (A ') on the inner side of the width corresponding to the non-weld bent portion 12 among the four vertices of the component square cross section with respect to the metal plate 1 Is press-molded so that the crease 2 is attached to the part.
- the mold shapes of the punch 3 and the die 4 are designed so that the crease 2 is formed.
- the radius of curvature in the plate width direction at the crease 2 takes a constant value over the entire length of the plate.
- the second step is a width end welding step.
- the pre-formed metal plates 1a and 1b are stacked one above the other so that the projecting side (the side where the crease 2 is formed by bending in the first step and becomes a convex surface) is the outside.
- the outer surface is pressed by the upper and lower holding jigs 6a and 6b, and the bending line (B) (B ') at the left end of the width overlapped vertically, the bending line at the right end (B ) (B ′)
- the parts are welded in the longitudinal direction to form the welded portion 11 to form the closed cross-section structure 5.
- This welding is preferably performed by laser welding, arc welding, or the like.
- a well-known laser welding apparatus etc. can be used for a welding apparatus (not shown).
- the third step is a roll forming step. That is, the closed cross-section structure 5 obtained in the previous step is passed through the roll forming machine 40.
- the roll forming machine 40 changes the roll interval between the rotating rolls 40a and 40b while guiding and transporting the closed cross-section structure 5 with a pair of left and right rotating rolls 40a and 40b, or a rotating roll 40c below. Furthermore, by raising and lowering the rotary roll 40c, the fold 2 and the welded portion 11 are used as a starting point to form a part 10 having a target shape.
- the shape of the rotating roll is set to a shape that can stably guide the roll contact portion of the closed cross-section structure, which is the workpiece, without causing a positional shift or the like.
- the rotary rolls 40a, 40b, and 40c in FIG. 1 are V-shaped as an example, but are not limited thereto.
- the roll interval of the rotating roll (corresponding to the pressing force from the left and right by the roll to the closed cross-section structure) and the raising and lowering position of the rotating roll (corresponding to the pushing force from the lower side by the roll to the closed cross-section structure) are obtained by the target part shape. To change. How to make the change can be obtained in advance by theoretical analysis or experiment. Further, a rotating roll corresponding to the lower rotating roll may be installed on the upper side and used to form the target shape of the component.
- the target shape of the part is a shape without twisting
- two metal plates 1 on each of the two metal plates 1 in FIG. Regarding the total three bend lines including the bend line and one bend line inside the width, the radius of curvature is the same and the center of curvature is placed on the same straight line, but the target shape of the part is a twisted shape.
- the target shape having a twist is achieved by either changing the radius of curvature or by preventing the center of curvature from being placed on the same straight line or both.
- the first to third steps can produce a closed cross-section structure part using a mold, a rotating roll, etc. having a shape corresponding to the part shape, as in the case of a square part. it can.
- FIG. 6 when a hexagonal cross-section component as shown in FIG. 5 is a manufacturing target, the number of non-weld bent portions 12 is increased by two compared to the case of the square cross-section of FIG. Accordingly, in accordance with this, as shown in FIG. 6, two bending lines (A) (A ′) on the inner side are set for each of the upper and lower blanks. Then, as a manufacturing process, for example, a process as shown in FIG. 4 is adopted in which the apparatus member used in FIG. 1 is changed in response to the change from the rectangular cross section to the hexagonal cross section.
- the mold shape used in the first step is a mold shape in which the crease 2 is attached to the location of the bend lines (A) and (A ′) in FIG.
- the holding jig 6 has a cross-sectional shape that matches the blank shape after pre-forming.
- the roll profile of the lower rotating roll 40c is formed into a flat bottom shape that can stably guide one side of the hexagon, for example. Except for these changes, the configuration is the same as in FIG. Thereby, the post-molding shape shown in the lower side of FIG. 6 is achieved with high accuracy and ease.
- Part target shape The cross-section is an irregularly shaped square (each corner is a right angle) in the longitudinal direction of the part, has no flange, and has a S-shaped bend in the longitudinal direction of the part.
- Part metal plate Two blanks A and B having an S-shaped bend corresponding to the part target shape were cut out from a cold-rolled steel plate (1.4 mm thick) having a tensile strength of 1180 MPa as a material.
- Yielding conditions Laser welding, laser output 3.8 kW, welding speed 2.5 m / min, laser focus diameter 2 mm
- one blank 1a has a bend line to be a crease 2 at a center position between two bend lines (B) and (B) on the width end side.
- (A) is set
- the other blank 1b is a bending line to be the crease 2 at the center position between the two bending lines (B ′) and (B ′) on the width end side.
- (A ') was set.
- the blank A is the upper side
- the blank B is the lower side
- the bending line (B) (B ′) portions on the width end side facing each other in the vertical direction are laser-welded, and the obtained closed cross-section structure 5 is described in the third step. As shown in FIG.
- one blank 1a (blank A) should become a crease 2 at a position to the left of the center between the two bending lines (B) and (B) on the width end side.
- the bend line (A) is set, and the other blank 1b (blank B) is positioned to the right of the center between the two bend lines (B ′) (B ′) on the width end side (the above-mentioned position with respect to the center position).
- a bending line (A ′) to be the crease 2 is set at a position symmetrical to the left side position.
- the molding can be performed in all of the first to third steps, and the part 10 after the third step achieves the target shape and molding such as fracture, buckling, wrinkle, etc. There were no defects.
- the intermediate shape part 15 after the irregular cross section did not have a molding defect occurrence place, but the final shape part 16 after the bending process was buckled at the shown position.
- Metal plate (a and b are either one of the two and the other, also called blank) 2 Fold (corresponding to bending line (A) (A ')) 3 Punch 4 Die 5 Closed section structure 6 Holding jig (a and b are upper and lower) 10 Parts (flangeless closed cross-section structure parts having a bent shape to be manufactured by the present invention) DESCRIPTION OF SYMBOLS 11 Welding part 12 Non-weld bending part 15 Intermediate shape part 16 of comparative example Final shape part 20 of comparative example 20 Press forming machine 30 Welding machine 40 Roll forming machine 40a, 40b Rotating roll 40c Rotating roll
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Abstract
Description
(1)2枚の金属板から部品長手方向に曲がり及び溶接部を有する異形断面形状のフランジレス閉断面構造部品を製造する方法であって、
部品長手方向曲がりに対応する板長手方向曲がりを設け、部品溶接部に板幅両端部を対応させた2枚の金属板を、部品断面内での非溶接曲がり部に対応する板部位に折目が付くようにプレス成形する第1工程と、
前記プレス成形後の2枚の金属板を、その凸面側が外側となるように上下に重ね合わせて幅の左端同士、右端同士をそれぞれ長手方向に溶接して溶接部を形成することで、閉断面構造体となす第2工程と、
得られた閉断面構造体を、左右一対の回転ロール或いは更に下方の回転ロールでガイドして搬送しつつ、前記回転ロールのロール間隔の変更或いは更に前記回転ロールの昇降により、前記折目及び前記溶接部を起点として立体化させて目標形状の部品となす第3工程とを有することを特徴とするフランジレス閉断面構造部品の製造方法。
部品長手方向曲がりに対応する板長手方向曲がりを設け、部品溶接部に板幅両端部を対応させた2枚の金属板を、部品断面内での非溶接曲がり部に対応する板部位に折目が付くようにプレス成形するプレス成形機と、
前記プレス成形後の2枚の金属板を、その凸面側が外側となるように上下に重ね合わせて幅の左端同士、右端同士をそれぞれ長手方向に溶接して溶接部を形成することで、閉断面構造体となす溶接機と、
得られた閉断面構造体を、左右一対の回転ロール或いは更に下方の回転ロールでガイドして搬送しつつ、前記回転ロールのロール間隔の変更或いは更に前記回転ロールの昇降により、前記折目及び前記溶接部を起点として立体化させて目標形状の部品となすロール成形機とを有することを特徴とするフランジレス閉断面構造部品の製造装置。
さらに主として曲げ加工で所定の形状を得ることが可能であるため、超高張力鋼板を素材とした部品製造が容易となり、フランジレス化による更なる軽量化が可能となる。
図2の例では、断面形状(短手方向断面形状の意、以下同じ)が四角形をなし、長手方向に曲がりを有し、尚且つ長手方向の始端部と終端部とでは断面形状が異なっている(すなわち、異形である)。四角形断面の始端部の一辺長は30mm、終端部の一辺長は20mm、長手方向全長(長手方向両端間の最短距離)が300mm、曲がりの曲率半径は始端側400mm、終端側で400mmであり、部品長手方向中央部(長手方向両端から150mmの位置)で曲がりの方向が左右逆転した形状である。又、四角形の対角位置にある二対の頂点のうち、一対が溶接部11、もう一対が非溶接曲がり部12をなしている。フランジは存在しない。
図3において、2枚の金属板1a,1bには、部品長手方向曲がりに対応する板長手方向曲がりを表すために、部品10の溶接部11に対応する幅端側の2本の曲げ線として、金属板1aでは曲げ線(B)(B)、金属板1bでは曲げ線(B’)(B’)がそれぞれ設けてあり、且つ、非溶接曲がり部12に対応する幅内側の1本の曲げ線として、金属板1aでは曲げ線(A)、金属板1bでは曲げ線(A’)がそれぞれ設けてある。
第1工程は予成形工程である。パンチ3とダイ4を有するプレス成形機20を用い、金属板1に対し、部品四角断面の4つの頂点のうち、非溶接曲がり部12に対応する幅内側の曲げ線(A)(A’)の部位に、折目2が付くようにプレス成形する。かかる折目2が付くように、パンチ3とダイ4の型形状は設計されている。尚、折目2の箇所における板幅方向の曲率半径は板の全長にわたって一定の値をとるようにした。
第2工程は幅端部溶接工程である。前記予成形後の金属板1a,1bを、その張り出し側(第1工程にて、曲げ成形により折目2が形成され、凸面となっている側)が外側となるように上下に重ね合わせて溶接機30内に配置し、その外面を、上下の押さえ治具6a,6bにて押さえ、上下に重なった幅の左端の曲げ線(B)(B’)部位同士、右端の曲げ線(B)(B’)部位同士をそれぞれ長手方向に溶接して溶接部11を形成し、閉断面構造体5となす。この溶接は、レーザ溶接、アーク溶接等で行うのが好適である。溶接装置(図示せず)は、公知のレーザ溶接装置等を用いることができる。
第3工程はロール成形工程である。すなわち、前工程で得られた閉断面構造体5をロール成形機40に通す。ロール成形機40は、閉断面構造体5を、左右一対の回転ロール40a,40b、或いは更に下方の回転ロール40cでガイドして搬送しつつ、前記回転ロール40a,40bのロール間隔の変更、或いは更に前記回転ロール40cの昇降により、前記折目2及び前記溶接部11を起点として立体化させて目標形状の部品10となす。
そして、製造工程としては、四角形断面を六角形断面に変更したことに対応して、図1において用いる装置部材に変更を加えてなる、例えば図4に示すような工程を採用する。すなわち、第1工程(予成形工程)に用いる金型形状を、図6の曲げ線(A)(A’)の箇所に折目2が付くような金型形状とする。第2工程(幅端部溶接工程)では、押さえ治具6を予成形後のブランク形状に合った断面形状のものとする。第3工程(ロール成形工程)では、下方の回転ロール40cのロールプロファイルを、例えば六角形の一辺部の安定的案内が可能な平底形状とする。これら変更点以外は図1と同様である。これにより、図6下側に示す成形後形状が、高精度且つ容易に達成される。
[部品目標形状] 断面が部品長手方向に異形の四角(各角は直角)形状で、フランジは無く、部品長手方向にS字形の曲がりを有する形状である。
[素材金属板] 引張強度が1180MPaの冷延鋼板(板厚1.4mm)から、部品目標形状に対応するS字形の曲がりを有する2枚のブランクA,Bを切り出して素材とした。
[溶接条件] レーザ溶接、レーザ出力3.8kW、溶接速度2.5m/分、レーザフォーカス直径2mm
図3(a)に示すように、1枚のブランク1a(ブランクA)は幅端側の2本の曲げ線(B)(B)間の中央の位置に、折目2となすべき曲げ線(A)を設定され、もう1枚のブランク1b(ブランクB)は幅端側の2本の曲げ線(B’)(B’)間の中央の位置に、折目2となすべき曲げ線(A’)を設定された。これら2枚のブランクA,Bを、第1工程で前述のとおり予成形して曲げ線(A)(A’)にそれぞれ沿った折目2を付け、第2工程で前述のとおり重ね合わせる際にブランクAを上側、ブランクBを下側とし、上下に向かい合った幅端側の曲げ線(B)(B’)部位をレーザ溶接し、得られた閉断面構造体5を第3工程で前述のとおりロール成形して、部品10を得た。
図3(b)に示すように、1枚のブランク1a(ブランクA)は幅端側の2本の曲げ線(B)(B)間の中央より左寄りの位置に、折目2となすべき曲げ線(A)を設定され、もう1枚のブランク1b(ブランクB)は幅端側の2本の曲げ線(B’)(B’)間の中央より右寄りの位置(中央の位置に関して前記左寄りの位置と対称の位置)に、折目2となすべき曲げ線(A’)を設定された。これら2枚のブランクA,Bを、第1工程で前述のとおり予成形して曲げ線(A)(A’)にそれぞれ沿った折目2を付け、第2工程で前述のとおり重ね合わせる際にブランクAを上側、ブランクBを下側とし、上下に向かい合った幅端側の曲げ線(B)(B’)部位をレーザ溶接し、得られた閉断面構造体5を第3工程で前述のとおりロール成形して、部品10を得た。
実施例と同じ鋼板から、実施例とは異なる形状に切り出した1枚のブランクを素材とし、従来通りロール成形にて成形開始部分と成形終了部分とが異形の断面形状となるように成形加工(異形断面化)を行い、図3(c)に示す、フランジレスの中間形状部品15となし、これをロール成形にて三点曲げの要領で曲げ加工し、最終形状部品16を得た。
2 折目(曲げ線(A)(A’)に対応)
3 パンチ
4 ダイ
5 閉断面構造体
6 押さえ治具(a,bは上と下)
10 部品(本発明が製造対象とする曲がり形状を有するフランジレス閉断面構造部品)
11 溶接部
12 非溶接曲がり部
15 比較例の中間形状部品
16 比較例の最終形状部品
20 プレス成形機
30 溶接機
40 ロール成形機
40a、40b 回転ロール
40c 回転ロール
Claims (2)
- 2枚の金属板から部品長手方向に曲がり及び溶接部を有する異形断面形状のフランジレス閉断面構造部品を製造する方法であって、
部品長手方向曲がりに対応する板長手方向曲がりを設け、部品溶接部に板幅両端部を対応させた2枚の金属板を、部品断面内での非溶接曲がり部に対応する板部位に折目が付くようにプレス成形する第1工程と、
前記プレス成形後の2枚の金属板を、その凸面側が外側となるように上下に重ね合わせて幅の左端同士、右端同士をそれぞれ長手方向に溶接して溶接部を形成することで、閉断面構造体となす第2工程と、
得られた閉断面構造体を、左右一対の回転ロール或いは更に下方の回転ロールでガイドして搬送しつつ、前記回転ロールのロール間隔の変更或いは更に前記回転ロールの昇降により、前記折目及び前記溶接部を起点として立体化させて目標形状の部品となす第3工程とを有することを特徴とするフランジレス閉断面構造部品の製造方法。 - 2枚の金属板から部品長手方向に曲がり及び溶接部を有する異形断面形状のフランジレス閉断面構造部品を製造する装置であって、
部品長手方向曲がりに対応する板長手方向曲がりを設け、部品溶接部に板幅両端部を対応させた2枚の金属板を、部品断面内での非溶接曲がり部に対応する板部位に折目が付くようにプレス成形するプレス成形機と、
前記プレス成形後の2枚の金属板を、その凸面側が外側となるように上下に重ね合わせて幅の左端同士、右端同士をそれぞれ長手方向に溶接して溶接部を形成することで、閉断面構造体となす溶接機と、
得られた閉断面構造体を、左右一対の回転ロール或いは更に下方の回転ロールでガイドして搬送しつつ、前記回転ロールのロール間隔の変更或いは更に前記回転ロールの昇降により、前記折目及び前記溶接部を起点として立体化させて目標形状の部品となすロール成形機と
を有することを特徴とするフランジレス閉断面構造部品の製造装置。
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CN201280072365.4A CN104364026B (zh) | 2012-04-13 | 2012-04-13 | 具有弯曲形状的无凸缘闭截面结构零件的制造方法及装置 |
PCT/JP2012/060644 WO2013153683A1 (ja) | 2012-04-13 | 2012-04-13 | 曲がり形状を有するフランジレス閉断面構造部品の製造方法及び装置 |
US14/394,191 US9669444B2 (en) | 2012-04-13 | 2012-04-13 | Method of manufacturing curvilineal closed structure parts without flange and apparatus for the same |
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EP2837437B1 (en) | 2017-04-12 |
KR20140132764A (ko) | 2014-11-18 |
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