WO2018030240A1 - Method of manufacturing press-formed article - Google Patents
Method of manufacturing press-formed article Download PDFInfo
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- WO2018030240A1 WO2018030240A1 PCT/JP2017/028106 JP2017028106W WO2018030240A1 WO 2018030240 A1 WO2018030240 A1 WO 2018030240A1 JP 2017028106 W JP2017028106 W JP 2017028106W WO 2018030240 A1 WO2018030240 A1 WO 2018030240A1
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- top plate
- curved portion
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- product shape
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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
- B21D22/20—Deep-drawing
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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
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Definitions
- the present invention forms a metal plate into a cross-sectional U-shaped or hat-shaped product shape having a longitudinal shape that is partially curved at one or two locations along the longitudinal direction, such as a side view or a U-shape.
- the present invention relates to a method for manufacturing a press-formed product.
- Patent Documents 1 to 3 As conventional techniques for countermeasures against springback, for example, there are techniques described in Patent Documents 1 to 3.
- the press molding method described in Patent Document 1 is a method of molding into a pressed part having a shape curved in the longitudinal direction so as to be convex toward the top plate portion side.
- embossing is formed on the surface of the top plate portion in the first molding step, and the second molding is performed after molding so that the line length of the entire length in the longitudinal direction is longer than the line length in the longitudinal direction of the final product.
- the press molding method described in Patent Document 2 is a method of molding a part having a shape curved in the longitudinal direction.
- a convex part is partially formed on the surface of the top plate part in the middle of molding by a punch in which pins are arranged, and the pin is lowered by a press load in the latter stage of molding to compress the surface of the top plate part.
- stress is applied to reduce springback.
- the press molding method described in Patent Document 3 is a method for molding a product having a hat-shaped or U-shaped cross-sectional shape and a longitudinal shape having a curved portion at an intermediate portion and straight portions adjacent to the middle portion.
- Patent Document 3 uses a blank material longer than the length of the product, and gives compressive stress to the top plate surface by forming the blank material corresponding to the curved portion with respect to the length of the curved portion. This is a method for reducing springback.
- An object of the present invention is to provide a method for producing a press-formed product that can be used.
- a method for manufacturing a press-formed product includes a hat-shaped or U-shaped cross-sectional shape having side wall portions on both sides in the width direction of the top plate portion, and a plurality of cross-sectional shapes.
- a metal plate is press-molded into a product shape having a longitudinal shape that includes one or two or more curved portions that are convexly or concavely curved toward the top plate portion by connecting the straight portions adjacent to the straight portion.
- the main molding (second step) is performed.
- the step it is possible to reduce the spring back of the hat-shaped or U-shaped cross-section component having a curved portion that is partially curved with a predetermined curvature along the longitudinal direction.
- a part with high dimensional accuracy can be obtained, which leads to an improvement in yield.
- the springback is reduced, for example, when a vehicle body structural component is formed using a component having a hat cross-sectional shape, it is possible to easily assemble the component.
- the product shape 1 of the press-formed product to be manufactured is a hat-shaped crossing in which both sides in the width direction of the top plate portion 1a are continuous with the flange portion 1c via the side wall portion 1b as shown in FIG. It has a surface shape and has a curved portion 11 that is convexly curved toward the top plate portion 1a with respect to one place in the longitudinal direction (a position closer to the right side in FIG. 1).
- FIG. An example of the shape of a press-formed product having a U-shaped longitudinal direction will be described. That is, the press-formed product of the present embodiment is a case in which the two linear portions 10 are connected to the top plate portion 1a side by the convex curved portion 11 along the longitudinal direction.
- a first step preliminary forming step
- a second step performed after the first step.
- At least a process main forming process.
- the metal plate 20 (blank material) is pressed with the upper die 16 and the lower die 15 (see FIG. 4A), and the line length in the longitudinal direction of the top plate portion 1a in the curved portion 11 is determined.
- the curvature radius of the curved portion 11 is formed into an intermediate part 21 smaller than the curvature radius in the product shape 1 so as to be longer than the line length in the product shape 1.
- the product shape is a hat-shaped cross-sectional shape having flange portions 1c on both sides in the width direction of the top plate portion 1a via the side wall portions 1b as shown in FIG.
- the line length in the longitudinal direction of the flange portion 1c is set to be shorter than the line length in the product shape.
- the line length in the longitudinal direction of the top plate portion 1a at the curved portion 11 for example, the length of a curved portion connecting the top plate portions 1a of the linear portions 10 on both sides in the longitudinal direction may be adopted (see FIG. 2).
- the line length in the longitudinal direction of the flange portion 1c at the curved portion 11 for example, the line length of a curved portion connecting the linear portions on both sides in the longitudinal direction in the flange portion 1c may be adopted (see FIG. 2). .
- CAE analysis for forming the metal plate 20 into the product shape 1 is performed, and based on the result, the top plate portion 1a.
- a stress generation region in which a longitudinal tensile stress is generated is set at a longitudinal position of the bending portion 11, and a line length at that position is employed.
- CAE analysis for forming the metal plate 20 into the product shape 1 is performed, and the flange portion is based on the result.
- a stress generation region in which a longitudinal compressive stress is generated in 1c is set at a longitudinal position at the flange portion 1c, and a line length at that position is adopted.
- the length of the longitudinal direction of the flange portion 1c in the curved portion 11 is defined as L2o in the product shape and defined as L2 ′ in the intermediate part, it is preferable to design so as to satisfy the following expression (3). . L2o> L2 ′ ⁇ 0.99 ⁇ L2o (3)
- the intersection angle itself between the long axes of the two linear portions 10 is smaller than that of the product shape 1.
- a mold is used to form a value longer than the line length of the bending portion 11 in the longitudinal direction of the top plate portion 1a.
- the intersection angle of the line obtained by extending the axes of two adjacent linear portions 10 is the same as or substantially the same as the intersection angle in the product shape 1 Will be described as an example. That is, as shown in FIG. 3, in a side view, the imaginary line L11 obtained by extending the top plate portion 1a of the two linear portions 10 located across the target bending portion 11 toward the vertex WP0 side of the bending portion 11, Consider L12.
- the intersection of the two virtual lines L11 and L12 is LP.
- a sign W ⁇ b> 1 is a profile of the top plate portion 1 a of the curved portion 11 in the intermediate part 21.
- the distance ⁇ H ⁇ b> 1 between the top plate portion 1 a of the curved portion 11 and the intersection point LP in the intermediate part 21 is larger than the distance ⁇ H ⁇ b> 0 between the top plate portion 1 a of the curved portion 11 and the intersection point LP in the product shape 1. Is set to be small.
- the molding in the first step is performed so that the interval ⁇ H0 between the intersection LP of the imaginary lines L11 and L12 and the vertex WP0 of the curved portion 11 in the product shape 1 is reduced, that is, the preliminary meat Y is given.
- the line length of the top plate portion 1a at the curved portion 11 in the intermediate part 21 is set to be longer than the product shape 1, and the curvature radius at the curved portion 11 in the intermediate part 21 is set to the product shape 1. It is formed so that the radius of curvature is smaller than that.
- the metal plate 20 (blank material) is pressed with the upper and lower molds 15 and 16 in which the shape of the curved portion 11 becomes the profile of WP1 as shown in FIG.
- the intermediate part 21 is molded (see FIG. 4A).
- the intermediate part 21 is pressed with the upper and lower molds 17 and 18 in which the shape of the curved part 11 becomes the outline of WP0 as shown in FIG. Manufacture to shape 1.
- the shape of the previous step can be designed more easily than arranging a plurality of convex shapes as described in Patent Document 1, and the second step
- the wire length obtained by extending the preliminary meat Y at the time of molding in this step becomes difficult to flow to other parts, and it becomes easy to apply compressive stress.
- the metal plate 20 to be formed is applicable as long as it is a metal plate 20 made of a press-moldable metal material such as a steel plate or an aluminum alloy, but depending on the case of an ultra-high tensile material having a material strength of 590 MPa or more. The spring back along the longitudinal direction can be effectively reduced.
- the product shape 1 is formed into a product shape 1 having a hat-shaped cross section in a side view as illustrated in FIG. 1 .
- the present invention can be applied even when it is formed into a U-shaped cross-sectional component.
- the present invention is particularly effective for the product shape 1 having a hat-shaped cross section.
- the product shape 1 is not limited to the product shape 1 in which the curved part 11 exists in only one place along a longitudinal direction like FIG.
- each curved portion 11 has a curved shape that is convex toward the top plate portion 1a, as described above, What is necessary is just to design the metal mold
- the length of the curved portion 11 having a concave shape on the top plate portion 1a side is the line length in the longitudinal direction of the top plate portion 1a in the curved portion 11.
- the curvature radius of the curved portion 11 becomes an intermediate part larger than the curvature radius of the product shape 1 so as to be shorter than the line length in the product shape.
- the curvature of the product shape 1 is shortened by forming the concave portion that forms the curvature so as to give a pre-wall. Adjust the radius of curvature to be larger than the radius.
- the longitudinal length of the top plate portion 1a in the curved portion 11 is defined as L1o in the product shape and defined as L1 'in the intermediate part, it is set so as to satisfy the following expression (2). It is preferable to do. L1o> L1 ′ ⁇ 0.99 ⁇ L1o (2) Further, with respect to the curved shape portion where the curved portion 11 is concave on the top plate portion 1a side, the longitudinal length of the flange portion 1c in the curved portion 11 is defined as L2o in the product shape, and L2 ′ in the intermediate part. When defined, it is preferable to design so as to satisfy the following expression (4). L2o ⁇ L2 ′ ⁇ 1.01 ⁇ L2o (4)
- the product shape 1 is a square shape in a side view shown in FIG. 1, and is a hat-shaped cross-sectional component that is curved with a predetermined curvature in the longitudinal direction at the apex portion of the round shape.
- Sample No. 1-3 are comparative examples in which the springback analysis was performed under the condition that the metal plate 20 was press-formed into the product shape 1 by the second step without performing the first step.
- This sample No. In the cases of 1 to 3, it can be seen that the maximum deviation from the product shape is 5.7 mm or more, and that the maximum deviation from the product shape increases as the material strength increases. It can be seen that the maximum deviation from the product shape is 10.4 mm for the 1180 MPa material.
- Sample No. Nos. 4 to 12 are analyzed under press conditions based on the present invention.
- the line length L1 ′ in the longitudinal direction of the top plate portion 1a at the curved portion 11 in the intermediate part is (1.005 ⁇ L1o) or (1.01) with respect to the line length L1o in the product shape 1.
- ⁇ L1o) is set under the condition that the first step is performed and then the product shape 1 is press-molded in the second step.
- Sample No. In Nos. 4 to 6 in the first step, the line length L1 ′ of the top plate portion 1a of the bending portion 11 is changed to 1.005 times the product shape 1, and then the product shape 1 is changed to the second step. This was analyzed under the condition of press forming.
- the line length L2 ′ of the flange portion 1c of the curved portion 11 in the first step was set to the same length as the line length L2o in the product shape 1.
- the maximum springback amount is 2.9 mm for the 1180 MPa material. It can be seen that the springback is greatly reduced as compared with FIG.
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Abstract
Description
車体構造部品に用いられるプレス成形品の一つとして、メンバーフロントサイドインナーのような部品がある。このプレス成形品は、長手方向に並ぶ2つの直線部を、天板部側に凸に湾曲した湾曲部で連結した、側面視、への字形状のハット型断面部品である。このような部品形状に金属板をプレス成形した場合、成形下死点で、天板部に引張応力が発生すると共にフランジ部に圧縮応力が発生し、これらの応力差によってプレス成形品にスプリングバック(キャンバーバック)が発生する。
このような部品に対し、ハイテン材を適用した場合、前述の下死点での応力差が更に大きくなり、スプリングバックが増加するといった課題を有する。 In recent years, high-tensile materials of 590 MPa or higher have been applied to vehicle body structural parts in order to achieve both improved collision safety and weight reduction of automobile bodies. However, since high tensile strength materials have high yield strength and tensile strength, defective molding such as springback becomes a problem when performing press molding.
One of the press-molded products used for vehicle body structural parts is a part such as a member front side inner. This press-molded product is a hat-shaped cross-sectional component having a square shape in a side view in which two linear portions arranged in the longitudinal direction are connected by a curved portion that is convexly curved toward the top plate portion. When a metal plate is press-molded in such a part shape, tensile stress is generated in the top plate part and compressive stress is generated in the flange part at the bottom dead center of the molding. (Camberback) occurs.
When a high-tensile material is applied to such a component, there is a problem that the stress difference at the bottom dead center is further increased and the spring back is increased.
特許文献1に記載のプレス成形方法は、天板部側に凸となるように長手方向に湾曲した形状を有するプレス部品に成形する方法である。特許文献1では、第一成形工程で天板部の面にエンボスを形成して、長手方向全長の線長が最終製品の長手方向における線長よりも長くなるように成形した後、第二成形工程で前記エンボスが無くなるように製品形状にプレス成形することで、天板部に圧縮応力を付与して、スプリングバックを低減する。 As conventional techniques for countermeasures against springback, for example, there are techniques described in
The press molding method described in
特許文献3に記載のプレス成形方法は、ハット型もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品を成形する方法である。特許文献3は、製品の長さよりも長いブランク材を使用し、湾曲部の長さに対して湾曲部に対応するブランク材を余らせて成形することにより天板面に圧縮応力を付与し、スプリングバックを低減する方法である。 The press molding method described in Patent Document 2 is a method of molding a part having a shape curved in the longitudinal direction. In Patent Document 2, a convex part is partially formed on the surface of the top plate part in the middle of molding by a punch in which pins are arranged, and the pin is lowered by a press load in the latter stage of molding to compress the surface of the top plate part. In this method, stress is applied to reduce springback.
The press molding method described in Patent Document 3 is a method for molding a product having a hat-shaped or U-shaped cross-sectional shape and a longitudinal shape having a curved portion at an intermediate portion and straight portions adjacent to the middle portion. . Patent Document 3 uses a blank material longer than the length of the product, and gives compressive stress to the top plate surface by forming the blank material corresponding to the curved portion with respect to the length of the curved portion. This is a method for reducing springback.
また特許文献3に記載のプレス成形方法では、湾曲部用とその両隣に存在する直線部用とに分割されている金型を用いるため、金型の構造が複雑になる。さらに製品よりも長いブランクを用いて成形する必要があるため、元形状で圧縮応力が付与されるフランジ部分等ではさらに圧縮応力が増加し、場合によってはスプリングバックやシワが増加する可能性がある。 Moreover, in the press molding method described in Patent Document 2, since it is necessary to have a press structure in which the pins are arranged in the punch and the pins move during the press molding, the mold has a complicated shape. In addition, when trying to apply to a part having a U-shape, such as a member front side inner, since the curved portion is small, cracking may occur when the material is lifted with a pin.
Moreover, in the press molding method described in Patent Document 3, a mold that is divided into a curved portion and a straight portion existing on both sides thereof is used, so that the structure of the mold becomes complicated. Furthermore, since it is necessary to mold using a blank longer than the product, the compressive stress further increases in the flange part etc. where compressive stress is applied in the original shape, and in some cases there is a possibility that spring back and wrinkles increase. .
本発明は、上記のような点に着目してなされたもので、簡易に、隣り合う直線部を湾曲部で連結したような長手方向形状を有するプレス成形品に発生するスプリングバックを大きく低減することができるプレス成形品の製造方法を提供することを目的とする。 The above problems become more prominent when applied to a high tensile strength material having a high tensile strength.
The present invention has been made paying attention to the above points, and greatly reduces the spring back generated in a press-formed product having a longitudinal shape such that adjacent straight portions are connected by a curved portion. An object of the present invention is to provide a method for producing a press-formed product that can be used.
上記湾曲部が上記天板部側に凸の湾曲の場合、その湾曲部における上記天板部の長手方向の線長が上記製品形状での線長より長くなるように当該湾曲部の曲率半径を上記製品形状での曲率半径よりも小さくし、上記湾曲部が上記天板部側に凹の湾曲の場合、その湾曲部における上記天板部の長手方向の線長が上記製品形状での線長より短くなるように当該湾曲部の曲率半径を上記製品形状での曲率半径よりも大きくした中間部品に成形する第1の工程と、上記中間部品を上記製品形状にプレス成形する第2の工程と、を有することを特徴とする。 In order to solve the problems, a method for manufacturing a press-formed product according to one aspect of the present invention includes a hat-shaped or U-shaped cross-sectional shape having side wall portions on both sides in the width direction of the top plate portion, and a plurality of cross-sectional shapes. A metal plate is press-molded into a product shape having a longitudinal shape that includes one or two or more curved portions that are convexly or concavely curved toward the top plate portion by connecting the straight portions adjacent to the straight portion. When
When the curved portion is curved convex toward the top plate portion side, the curvature radius of the curved portion is set so that the line length in the longitudinal direction of the top plate portion in the curved portion is longer than the line length in the product shape. When the curvature is smaller than the radius of curvature in the product shape and the bending portion is concave on the top plate portion side, the line length in the longitudinal direction of the top plate portion in the bending portion is the wire length in the product shape. A first step of forming an intermediate part having a radius of curvature of the curved portion larger than the curvature radius of the product shape so as to be shorter, and a second step of press-molding the intermediate part into the product shape It is characterized by having.
この結果、本発明の一態様によれば、寸法精度の高い部品が得られることで、歩留まりの向上に繋がる。さらに、スプリングバックが低減することで、例えばハット断面形状の部品を用いて車体構造部品とする際に、部品の組立てを容易に行うことが可能となる。 According to one aspect of the present invention, after performing a simple preliminary molding (first step) in which the radius of curvature of the curved portion connecting adjacent straight portions is smaller than the product shape, the main molding (second step) is performed. By performing the step, it is possible to reduce the spring back of the hat-shaped or U-shaped cross-section component having a curved portion that is partially curved with a predetermined curvature along the longitudinal direction.
As a result, according to one embodiment of the present invention, a part with high dimensional accuracy can be obtained, which leads to an improvement in yield. Furthermore, since the springback is reduced, for example, when a vehicle body structural component is formed using a component having a hat cross-sectional shape, it is possible to easily assemble the component.
本実施形態では、製造するプレス成形品の製品形状1が、図1に示すような、天板部1aの幅方向両側が側壁部1bを介してフランジ部1cに連続しているハット型の横断面形状であると共に、長手方向の一箇所(図1では右側寄りの位置)に対し天板部1a側に凸に湾曲した湾曲部11を有して、図1に示すように、側面視で、への字形状の長手方向形状を有するプレス成形品形状の場合を例に説明する。すなわち、本実施形態のプレス成形品は、長手方向に沿って、2つの直線部10を天板部1a側に凸の湾曲部11で連結したような形状となっている場合である。 Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, the
第1の工程では、金属板20(ブランク材)を、上型16と下型15でプレスして(図4(a)参照)、湾曲部11における天板部1aの長手方向の線長を、製品形状1での線長より長くなるように、当該湾曲部11の曲率半径を上記製品形状1での曲率半径よりも小さい中間部品21に成形する。 In the method for manufacturing a press-formed product of the present embodiment, in order to reduce this spring back, as a press forming step, a first step (preliminary forming step) and a second step performed after the first step are performed. At least a process (main forming process).
In the first step, the metal plate 20 (blank material) is pressed with the
湾曲部11での天板部1aの長手方向の線長は、例えば長手方向両側の直線部10の天板部1a間を連結する曲線部分の線長を採用すればよい(図2参照)。また、湾曲部11でのフランジ部1cの長手方向の線長も、例えば、フランジ部1cにおける、長手方向両側の直線部間を連結する曲線部分の線長を採用すればよい(図2参照)。 At this time, when the product shape is a hat-shaped cross-sectional shape having
As the line length in the longitudinal direction of the
L1o < L1′ ≦ 1.01 ×L1o ・・・・(1)
ここで、L1′が(1.01×L1o)よりも大きい場合、第1の工程において、湾曲部11における天板部1aの頂点に発生する張力が過大になり、超ハイテン材に適用した場合に、割れが発生する可能性が増大する。一方、L1′がL1oよりも小さい場合、第2の工程において、天板部1aの面に十分な圧縮応力が加わらないため、スプリングバックが十分低減されないおそれがある。 Here, when the line length in the longitudinal direction of the
L1o <L1 ′ ≦ 1.01 × L1o (1)
Here, when L1 ′ is larger than (1.01 × L1o), in the first step, the tension generated at the apex of the
L2o > L2’ ≧ 0.99 ×L2o ・・・・(3)
第1の工程において、湾曲部11における天板部1aの曲率半径を、製品形状1よりも小さくする方法としては、2つの直線部10の長軸同士の交角自体を製品形状1に比べて小さくなるような、金型を使用して、湾曲部11における天板部1aの長手方向の線長よりも長い値に成形する方法もある。 Moreover, when the length of the longitudinal direction of the
L2o> L2 ′ ≧ 0.99 × L2o (3)
In the first step, as a method of making the radius of curvature of the
すなわち、図3のように、側面視で、対象とする湾曲部11を挟んで位置する2つの直線部10の天板部1aを湾曲部11の頂点WP0側に向けて延長した仮想線L11、L12を考える。その2本の仮想線L11、L12の交点をLPとする。図3の符号W0は、製品形状1での湾曲部11の天板部1aのプロフィールで、符合W1が中間部品21での湾曲部11の天板部1aのプロフィールである。図3に示すように、製品形状1での湾曲部11の天板部1aと交点LPとの間隔ΔH0よりも、中間部品21での湾曲部11の天板部1aと交点LPとの間隔ΔH1が小さくなるように設定する。 In the present embodiment, when the first step is formed under the condition that the intersection angle of the line obtained by extending the axes of two adjacent
That is, as shown in FIG. 3, in a side view, the imaginary line L11 obtained by extending the
そして、第1の工程では、天板部1aについて、図3のように湾曲部11の形状がWP1のプロフィールとなる上下の金型15、16で、金属板20(ブランク材)をプレスして中間部品21を成形する(図4(a)参照)。 That is, the molding in the first step is performed so that the interval ΔH0 between the intersection LP of the imaginary lines L11 and L12 and the vertex WP0 of the
In the first step, with respect to the
第1の工程にて、上記のように予肉Yを成形することによって、特許文献1に記載のように複数の凸形状を配置するよりも簡単に前工程の形状を設計でき、また第2の工程の成形時に予肉Yを伸ばした線長分が他の部分に流れにくくなり、圧縮応力をかけやすくなる。 Next, in the second step, the
In the first step, by shaping the pre-mesh Y as described above, the shape of the previous step can be designed more easily than arranging a plurality of convex shapes as described in
ここで、例えば、第1の工程ではドロー成形またはフォーム成形を適用し、第2の工程では製品形状1に成形するリストライク工程とする。また、成形する金属板20は、鋼板やアルミ合金などプレス成形可能な金属材料からなる金属板20であれば適用可能であるが、金属板20の材料強度が590MPa以上の超ハイテン材の場合により有効に長手方向に沿ったスプリングバックを低減可能となる。 At the same time, in the first step, by designing the length of the
Here, for example, draw molding or foam molding is applied in the first process, and the second process is a wrist-like process in which the
また、製品形状1は、図1のような、湾曲部11が長手方向に沿って1箇所だけに存在する製品形状1に限定されない。例えば、図5に示すように、長手方向に沿って2箇所以上に湾曲部11が設けられて、隣り合う直線部10がその湾曲部11で連結されるような形状の長手方向形状を有する製品形状であっても、本発明は適用可能である。 In the above embodiment, as illustrated in FIG. 1, the case where the product is formed into a
Moreover, the
また、図5(a)のように、湾曲部11が天板部1a側に凹の湾曲形状の部分については、第1の工程において、湾曲部11における天板部1aの長手方向の線長を、製品形状での線長より短くなるように、当該湾曲部11の曲率半径を製品形状1での曲率半径よりも大きい中間部品となるように設定する。湾曲部11が天板部1a側に凹の湾曲形状の部分では、例えば、湾曲を形成する凹部分に予肉を付与するように成形することで線長を短くして製品形状1での曲率半径よりも大きい曲率半径に調整する。 At this time, as shown in FIG. 5B, in the case where each
Further, as shown in FIG. 5 (a), in the first step, the length of the
L1o > L1′ ≧ 0.99 ×L1o ・・・・(2)
更に、湾曲部11が天板部1a側に凹の湾曲形状の部分について、その湾曲部11におけるフランジ部1cの長手方向の線長を、製品形状でL2oと定義し、中間部品でL2’と定義したとき、下記(4)式を満足するように設計することが好ましい。
L2o < L2′ ≦ 1.01 ×L2o ・・・・(4) At this time, when the longitudinal length of the
L1o> L1 ′ ≧ 0.99 × L1o (2)
Further, with respect to the curved shape portion where the
L2o <L2 ′ ≦ 1.01 × L2o (4)
本実施例では、製品形状1を、図1に示す側面視で、への字形状になっており、への字の頂点部において長手方向に所定の曲率で湾曲したハット型断面部品であるという条件に設定した。また、プレス成形に使用する金属板20は板厚t=2.0mmであって、引張強度が590MPa級~1180MPa級の鋼板とした。
その解析による解析条件とそのときの評価結果を、表1に示す。 In order to confirm the effect of reducing the springback by the press molding method according to the present invention, a press molding analysis and a springback analysis by a finite element method (FEM) were performed.
In the present embodiment, the
Table 1 shows the analysis conditions and the evaluation results at that time.
サンプルNo.4~6では、第1の工程で、湾曲部11の天板部1aの線長L1′を製品形状1の1.005倍の長さに変形した後に、第2の工程で製品形状1にプレス成形するという条件で解析したものである。ただし、第1の工程での湾曲部11のフランジ部1cの線長L2′を製品形状1での線長L2oと同じ長さに設定した。この条件でスプリングバック解析を実施した場合、最大スプリングバック量は、1180MPa材で2.9mmであり、サンプルNo.3と比較して大幅にスプリングバックが低減することが分かる。 Sample No. Nos. 4 to 12 are analyzed under press conditions based on the present invention. In this sample example, the line length L1 ′ in the longitudinal direction of the
Sample No. In Nos. 4 to 6, in the first step, the line length L1 ′ of the
ここでは、限られた数の実施形態を参照しながら説明したが、権利範囲はそれらに限定されるものではなく、上記の開示に基づく各実施形態の改変は当業者にとって自明なことである。 As described above, the entire contents of Japanese Patent Application No. 2016-156816 (filed on Aug. 9, 2016), from which this application claims priority, form part of this disclosure by reference.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of each embodiment based on the above disclosure are obvious to those skilled in the art.
1a 天板部
1b 側壁部
1c フランジ部
10 直線部
11 湾曲部
15、16 第1の工程での金型
17、18 第2の工程での金型
20 金属板
21 中間部品
L1o 製品形状での天板部の線長
L1′ 中間部品での天板部の線長
L2o 製品形状でのフランジ部の線長
L2′ 中間部品でのフランジ部の線長L11、L12 仮想線
LP 交点
WP0 頂点
Y 予肉 DESCRIPTION OF
Line length of the top plate in L1o product shape
L1 'Line length of the top plate at the intermediate part
L2o product shape flange length
L2 'Line length of flange part at intermediate part L11, L12 Virtual line LP Intersection WP0 Vertex Y Precarnation
Claims (10)
- 天板部の幅方向両側に側壁部を有してハット型若しくはコ字状の横断面形状を有し且つ複数の直線部と隣り合う上記直線部を連結し天板部側に凸又は凹に湾曲した1又は2以上の湾曲部とを備える長手方向形状を有する製品形状に、金属板をプレス成形して製造する際に、
上記湾曲部が上記天板部側に凸の湾曲の場合、その湾曲部における上記天板部の長手方向の線長が上記製品形状での線長より長くなるように当該湾曲部の曲率半径を上記製品形状での曲率半径よりも小さくし、上記湾曲部が上記天板部側に凹の湾曲の場合、その湾曲部における上記天板部の長手方向の線長が上記製品形状での線長より短くなるように当該湾曲部の曲率半径を上記製品形状での曲率半径よりも大きくした中間部品に成形する第1の工程と、
上記中間部品を上記製品形状にプレス成形する第2の工程と、を有することを特徴とするプレス成形品の製造方法。 It has a side wall portion on both sides in the width direction of the top plate portion, has a hat-shaped or U-shaped cross-sectional shape, and connects the straight portions adjacent to a plurality of straight portions to be convex or concave on the top plate portion side. When manufacturing by pressing a metal plate into a product shape having a longitudinal shape with one or more curved portions curved,
When the curved portion is curved convex toward the top plate portion side, the curvature radius of the curved portion is set so that the line length in the longitudinal direction of the top plate portion in the curved portion is longer than the line length in the product shape. When the curvature is smaller than the radius of curvature in the product shape and the bending portion is concave on the top plate portion side, the line length in the longitudinal direction of the top plate portion in the bending portion is the wire length in the product shape. A first step of forming an intermediate part in which the curvature radius of the curved portion is larger than the curvature radius in the product shape so as to be shorter;
And a second step of press-molding the intermediate part into the product shape. - 上記湾曲部における上記天板部の長手方向の線長を、上記製品形状でL1oと定義し、上記中間部品でL1′と定義したとき、
上記湾曲部が上記天板部側に凸の場合には、下記(1)式を満足することを特徴とする請求項1に記載したプレス成形品の製造方法。
L1o < L1′ ≦ 1.01 ×L1o ・・・・(1) When the line length in the longitudinal direction of the top plate portion in the curved portion is defined as L1o in the product shape and defined as L1 ′ in the intermediate part,
2. The method for manufacturing a press-formed product according to claim 1, wherein the following equation (1) is satisfied when the curved portion is convex toward the top plate portion side.
L1o <L1 ′ ≦ 1.01 × L1o (1) - 上記湾曲部における上記天板部の長手方向の線長を、上記製品形状でL1oと定義し、上記中間部品でL1′と定義したとき、
上記湾曲部が上記天板部側に凹の場合には、下記(2)式を満足することを特徴とする請求項1に記載したプレス成形品の製造方法。
L1o > L1’ ≧ 0.99 ×L1o ・・・・(2) When the line length in the longitudinal direction of the top plate portion in the curved portion is defined as L1o in the product shape and defined as L1 ′ in the intermediate part,
2. The method for manufacturing a press-formed product according to claim 1, wherein when the curved portion is concave on the top plate side, the following expression (2) is satisfied.
L1o> L1 ′ ≧ 0.99 × L1o (2) - 上記湾曲部の範囲は、上記金属板を上記製品形状に成形するCAE解析の結果に基づき、上記天板部に長手方向引張応力若しくは長手方向圧縮応力が発生する応力発生領域に設定することを特徴とする請求項2又は請求項3に記載したプレス成形品の製造方法。 The range of the curved portion is set in a stress generation region where longitudinal tensile stress or longitudinal compressive stress is generated in the top plate portion based on the result of CAE analysis for forming the metal plate into the product shape. The method for producing a press-formed product according to claim 2 or 3.
- 第1の工程において、上記湾曲部が上記天板部側に凸の場合、対象とする湾曲部を挟んで位置する2つの直線部の天板部を湾曲部の頂点部側に向けて延長した仮想線の交点と上記湾曲部の頂点との間隔が小さくなるように予肉を成形して、上記湾曲部の曲率半径を小さくすることを特徴とする請求項1~請求項4のいずれか1項に記載したプレス成形品の製造方法。 In the first step, when the curved portion is convex on the top plate portion side, the top plate portions of the two linear portions located across the target curved portion are extended toward the apex side of the curved portion. 5. The method according to claim 1, wherein a pre-curve is formed so that an interval between the intersection of the imaginary lines and the apex of the curved portion is small, and the curvature radius of the curved portion is reduced. The manufacturing method of the press-formed product described in the item.
- 上記製品形状は、天板部の幅方向両側に側壁部を介してフランジ部を有するハット型の横断面形状であり、
上記第1の工程で、上記湾曲部が上記天板部側に凸の湾曲の場合、その湾曲部における上記フランジ部の長手方向の線長が上記製品形状での線長より短くなるように設定し、上記湾曲部が上記天板部側に凹の湾曲の場合、その湾曲部における上記フランジ部の長手方向の線長が上記製品形状での線長より長くなるように設定して、中間部品に成形することを特徴とする請求項1~請求項5のいずれか1項に記載したプレス成形品の製造方法。 The product shape is a hat-shaped cross-sectional shape having flange portions on both sides in the width direction of the top plate portion via side wall portions,
In the first step, when the curved portion is curved convex toward the top plate portion, the longitudinal length of the flange portion in the curved portion is set to be shorter than the length of the product shape. When the curved part is concavely curved toward the top plate part side, the longitudinal length of the flange part in the curved part is set so as to be longer than the line length in the product shape. The method for producing a press-formed product according to any one of claims 1 to 5, wherein the press-formed product is molded into a shape. - 上記湾曲部における上記フランジ部の長手方向の線長を、上記製品形状でL2oと定義し、上記中間部品でL2’と定義したとき、
上記湾曲部が上記天板部側に凸の場合には、下記(3)式を満足することを特徴とする請求項6に記載したプレス成形品の製造方法。
L2o > L2’ ≧ 0.99 ×L2o ・・・・(3) When the line length in the longitudinal direction of the flange portion in the curved portion is defined as L2o in the product shape and defined as L2 ′ in the intermediate part,
7. The method for manufacturing a press-formed product according to claim 6, wherein when the curved portion is convex toward the top plate portion, the following expression (3) is satisfied.
L2o> L2 ′ ≧ 0.99 × L2o (3) - 上記湾曲部における上記フランジ部の長手方向の線長を、上記製品形状でL2oと定義し、上記中間部品でL2’と定義したとき、
上記湾曲部が上記天板部側に凹の場合には、下記(4)式を満足することを特徴とする請求項6又は請求項7に記載したプレス成形品の製造方法。
L2o < L2′ ≦ 1.01 ×L2o ・・・・(4) When the line length in the longitudinal direction of the flange portion in the curved portion is defined as L2o in the product shape and defined as L2 ′ in the intermediate part,
The method for manufacturing a press-formed product according to claim 6 or 7, wherein when the curved portion is concave on the top plate portion side, the following expression (4) is satisfied.
L2o <L2 ′ ≦ 1.01 × L2o (4) - 第1の工程ではドロー成形またはフォーム成形を適用し、第2の工程では製品形状に成形するリストライク工程であることを特徴とする請求項1~請求項8のいずれか1項に記載したプレス成形品の製造方法。 The press according to any one of claims 1 to 8, wherein the first step is a re-strike step in which draw molding or foam molding is applied, and the second step is molding into a product shape. Manufacturing method of molded products.
- 上記金属板の材料強度が590MPa以上の鋼板であることを特徴とする請求項1~請求項9のいずれか1項に記載したプレス成形品の製造方法。 The method for producing a press-formed product according to any one of claims 1 to 9, wherein the metal plate is a steel plate having a material strength of 590 MPa or more.
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JP6590071B2 (en) | 2019-10-16 |
KR102183405B1 (en) | 2020-11-26 |
KR20190022838A (en) | 2019-03-06 |
MX2019001610A (en) | 2019-05-15 |
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