JP2011206789A - Press forming method - Google Patents

Press forming method Download PDF

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JP2011206789A
JP2011206789A JP2010074951A JP2010074951A JP2011206789A JP 2011206789 A JP2011206789 A JP 2011206789A JP 2010074951 A JP2010074951 A JP 2010074951A JP 2010074951 A JP2010074951 A JP 2010074951A JP 2011206789 A JP2011206789 A JP 2011206789A
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curvature
molded
molding
angle
press
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Takayuki Kimura
高行 木村
Jiro Iwatani
二郎 岩谷
Takayuki Yamano
隆行 山野
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Kobe Steel Ltd
株式会社神戸製鋼所
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Abstract

PROBLEM TO BE SOLVED: To provide a press forming method by which deformation of a formed parts in the mouth opening direction is suppressed after releasing pressurization.SOLUTION: The press forming method is provided for press-forming the formed parts 1 having a top surface portion 2 which is bent at a predetermined curvature in the longitudinal direction and two side surface portions 3 which are extended toward the inside of the bend from both longitudinal-direction ends of the top surface portion 2. The method has a preforming step and a normal forming step. In the preforming step, the preformed parts 31 is press-formed, the preformed parts 31 having a top surface portion 32 which is bent at a curvature different from the above predetermined curvature in the longitudinal direction and two side portions 33 which are extended toward the inside of the bend from both longitudinal-direction ends of the top surface portion 32 and which have an angle formed with the top surface portion 32 larger than that of the formed parts 1. In the normal forming step, after making the top surface portion 32 of the preformed parts 31 deform in a direction approaching the predetermined curvature by pressing, and in that state, press forming is performed so that the angle formed by the top surface portion 32 and the side portions 33 is made smaller than that of the preformed parts 31.

Description

本発明は、長手方向に湾曲した天面部と、天面部の長手方向に沿った両端から湾曲内側に延在する2つの側面部とを有する成形部品を成形するプレス成形方法に関する。   The present invention relates to a press molding method for molding a molded part having a top surface portion curved in the longitudinal direction and two side surface portions extending inwardly from both ends along the longitudinal direction of the top surface portion.
従来から、自動車部品等に用いられるプレス成形部品として、長手方向に湾曲した天面部と、この天面部の長手方向に沿った両端から湾曲内側に延在する2つの側面部とを有するものがある(例えば、特許文献1参照)。このような成形部品としては、側面部の先端にフランジ部が設けられているものもある。   2. Description of the Related Art Conventionally, press-molded parts used for automobile parts and the like have a top surface portion that is curved in the longitudinal direction and two side surface portions that extend inward from both ends along the longitudinal direction of the top surface portion. (For example, refer to Patent Document 1). As such a molded part, there is one in which a flange portion is provided at the tip of the side surface portion.
特開2007−21568号公報JP 2007-21568 A
しかしながら、上述したような成形部品をプレス成形した場合、成形部品を型から解放すると、側面部と天面部との連結部分(コーナー部分)が、弾性回復(スプリングバック)によって曲げ角度が大きくなるように変形し、口開きが生じる場合がある。また、フランジ部を有する成形部品の場合には、加圧解除後、コーナー部分の曲げ角度がスプリングバックによって大きくなることとに加えて、側面部がスプリングバックによって反ることによって、口開きが生じる場合がある。また、成形部品の天面部は湾曲しているため、加圧解除後、天面部が、スプリングバックによって曲率が小さくなる方向に変形する場合がある。成形部品の材料として、高張力鋼板(ハイテン材)などの高強度の金属板を用いた場合、スプリングバックが大きいため、上述したような寸法精度不良がより生じやすい。   However, when a molded part as described above is press-molded, when the molded part is released from the mold, the bending angle of the connecting portion (corner portion) between the side surface portion and the top surface portion increases due to elastic recovery (spring back). It may be deformed and a mouth opening may occur. Further, in the case of a molded part having a flange portion, after releasing the pressure, the bending angle of the corner portion is increased by the spring back, and the side surface portion is warped by the spring back, thereby opening the mouth. There is a case. In addition, since the top surface portion of the molded part is curved, the top surface portion may be deformed in a direction in which the curvature is reduced by the spring back after the pressure is released. When a high-strength metal plate such as a high-tensile steel plate (high-tensile material) is used as the material of the molded part, the spring back is large, and the above-described dimensional accuracy defects are more likely to occur.
そこで、本発明は、成形部品が加圧解除後に口開き方向に変形するを抑制することのできるプレス成形方法を提供することを目的とする。   Then, an object of this invention is to provide the press molding method which can suppress that a shaping | molding component deform | transforms in an opening direction after pressure cancellation.
課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention
第1の発明のプレス成形方法は、長手方向に所定の曲率で湾曲した天面部と、前記天面部の長手方向に沿った両端から湾曲内側に向かって延在する2つの側面部とを有する成形部品をプレス成形するプレス成形方法であって、長手方向に前記所定の曲率と異なる曲率で湾曲する天面部と、前記天面部の長手方向に沿った両端から湾曲内側に向かって延在し且つ前記天面部となす角度が前記成形部品よりも大きい2つの側面部とを有する予備成形部品をプレス成形する予備成形工程と、前記予備成形部品の前記天面部をプレスして前記所定の曲率に近づく方向に変形させてから、その状態で、前記天面部と前記側面部とがなす角度が前記予備成形部品より小さくなるようにプレス成形する本成形工程とを有することを特徴とする。   A press molding method according to a first aspect of the present invention is a molding having a top surface portion curved with a predetermined curvature in the longitudinal direction and two side surface portions extending from both ends along the longitudinal direction of the top surface portion toward the inside of the curve. A press molding method for press-molding a component, the top surface portion being curved with a curvature different from the predetermined curvature in a longitudinal direction, extending from both ends along the longitudinal direction of the top surface portion toward the inside of the curve, and A preforming step of press-molding a preformed part having two side parts with an angle formed with the top surface part larger than that of the molded part, and a direction in which the top surface part of the preformed part is pressed to approach the predetermined curvature And a main forming step of press forming so that an angle formed between the top surface portion and the side surface portion is smaller than that of the preformed part.
この構成によると、本成形工程において成形部品をプレス成形後、成形部品を型から解放したときに、成形部品が口開き方向(側面部の先端同士の離間距離が大きくなる方向)に変形するのを抑制することができる。
また、予備成形工程と本成形工程において天面部を2回プレスするため、成形部品を1回成形によって成形した場合に比べると、成形部品の天面部が加圧解除後に曲率が小さくなる方向に変形するのを抑制することができる。
According to this configuration, when the molded part is released from the mold after the molded part is press-molded in the main molding process, the molded part is deformed in the opening direction (the direction in which the distance between the tips of the side surface portions increases). Can be suppressed.
In addition, since the top surface is pressed twice in the pre-molding process and the main molding process, the top surface of the molded part is deformed in a direction in which the curvature becomes smaller after the pressure is released compared to the case where the molded part is molded once. Can be suppressed.
第2の発明のプレス成形方法は、前記第1の発明において、前記予備成形部品の前記天面部は、前記所定の曲率よりも大きい曲率で湾曲することを特徴とする。   The press molding method of the second invention is characterized in that, in the first invention, the top surface portion of the preformed part is curved with a curvature larger than the predetermined curvature.
この構成によると、本成形工程において、予備成形部品の天面部を前記所定の曲率に近づく方向、即ち、曲率が小さくなる方向に変形させると、側面部は天面部の長手方向に伸ばされるため引張応力が発生しようとする。側面部は、この時点ではプレスされていないため、この引張応力を緩和するように、口閉じ方向に変形する。このときの側面部の変形癖が側面部をプレス成形した後も残り、口閉じ方向に作用するため、成形部品が加圧解除後に口開き方向に変形するのを抑制することができる。
また、予備成形工程において、成形部品の天面部の曲率よりも大きい曲率に天面部を成形し、本成形工程では、天面部を曲率が小さくなる方向に変形させているため、曲率が小さくなるが小さくなる方向の天面部2のスプリングバックを低減できる。したがって、成形部品の天面部が加圧解除後に曲率が小さくなる方向に変形するのを抑制することができる。
According to this configuration, in the main forming step, when the top surface portion of the preformed part is deformed in a direction approaching the predetermined curvature, that is, in a direction in which the curvature decreases, the side surface portion is stretched in the longitudinal direction of the top surface portion, so that the tension is applied. Stress is about to occur. Since the side portion is not pressed at this point, the side portion is deformed in the mouth closing direction so as to relieve the tensile stress. At this time, the deformation of the side surface portion remains even after the side surface portion is press-molded, and acts in the closing direction of the mouth, so that it is possible to prevent the molded part from being deformed in the opening direction after releasing the pressure.
Further, in the preforming step, the top surface portion is formed to have a curvature larger than the curvature of the top surface portion of the molded part, and in this forming step, the top surface portion is deformed in a direction in which the curvature decreases, so the curvature decreases. Springback of the top surface portion 2 in the direction of decreasing can be reduced. Therefore, it can suppress that the top | upper surface part of a molded component deform | transforms in the direction in which a curvature becomes small after pressure cancellation.
第3の発明のプレス成形方法は、前記第2の発明において、前記予備成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]とし、前記本成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]としたときに、下記式(1)〜(3)を満たすことを特徴とする。
1<ρ/ρ≦1.75 ……(1)
ρ/ρ≦0.15×(θ−θ)−4.55 ……(2)
θ−θ≦52 ……(3)
In the press molding method of the third invention, in the second invention, the curvature of the top surface portion at the time of pressing in the preforming step is ρ 1 [1 / mm], and the angle formed by the top surface portion and the side surface portion. Is θ 1 [°], the curvature of the top surface portion during pressing in the main forming step is ρ 2 [1 / mm], and the angle between the top surface portion and the side surface portion is θ 2 [°]. The following formulas (1) to (3) are satisfied.
1 <ρ 1 / ρ 2 ≦ 1.75 (1)
ρ 1 / ρ 2 ≦ 0.15 × (θ 1 −θ 2 ) −4.55 (2)
θ 1 −θ 2 ≦ 52 (3)
この構成によると、成形部品にしわが生じるのを防止することができるとともに、加圧解除後に成形部品が口開き方向に変形するのをより確実に抑制することができる。また、加圧解除後に成形部品の天面部が曲率が小さくなる方向に変形するのをより確実に抑制することができる。   According to this configuration, it is possible to prevent the molded part from being wrinkled and to more reliably suppress the molded part from being deformed in the opening direction after the pressure is released. Moreover, it can suppress more reliably that the top | upper surface part of a molded component deform | transforms in the direction where a curvature becomes small after pressure cancellation.
第4の発明のプレス成形方法は、前記第1の発明において、前記予備成形部品の前記天面部は、前記所定の曲率よりも小さい曲率で湾曲することを特徴とする。   The press molding method according to a fourth aspect of the present invention is characterized in that, in the first aspect, the top surface portion of the preformed part is curved with a curvature smaller than the predetermined curvature.
この構成によると、本成形工程においてプレス成形後、成形部品を型から解放すると、成形部品には、予備成形工程において所定の曲率(成形部品の天面部の曲率)よりも小さい曲率で成形した際の変形癖が残っている。この変形癖と、本成形工程のプレスによるスプリングバックとによって、成形部品の天面部は、曲率が小さくなる方向に変形する。これにより、側面部は天面部の長手方向に伸ばされるため、側面部には引張応力が発生しようとする。側面部は、この引張応力を緩和するように、口閉じ方向に変形する。そのため、成形部品が加圧解除後に口開き方向に変形するのを抑制することができる。
また、上述したように、加圧解除後、成形部品の天面部は、曲率が小さくなる方向に変形するが、天面部の変形量は、成形部品を1回成形によって成形した場合のスプリングバックによる変形量に比べて小さい。
According to this configuration, when the molded part is released from the mold after press molding in the main molding process, the molded part is molded with a curvature smaller than a predetermined curvature (the curvature of the top surface of the molded part) in the preliminary molding process. The deformed jar remains. Due to this deformation wrinkle and the spring back by the press in the main forming step, the top surface portion of the molded part is deformed in a direction in which the curvature becomes smaller. Thereby, since the side surface portion is extended in the longitudinal direction of the top surface portion, a tensile stress tends to be generated on the side surface portion. The side portion is deformed in the mouth closing direction so as to relieve the tensile stress. Therefore, it is possible to suppress the molded part from being deformed in the opening direction after releasing the pressure.
In addition, as described above, after the pressure is released, the top surface portion of the molded part is deformed in a direction in which the curvature decreases, but the amount of deformation of the top surface portion is due to the spring back when the molded component is molded once. Small compared to the amount of deformation.
第5の発明のプレス成形方法は、前記第4の発明において、前記予備成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]とし、前記本成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]としたときに、下記式(1)〜(4)を満たすことを特徴とする。
ρ/ρ<1 ……(1)
ρ/ρ≦0.06×(θ−θ)−1.22……(2)
ρ/ρ≧0.012×(θ−θ)+0.136……(3)
θ−θ≦47 ……(4)
The press molding method of the fifth invention is the press molding method according to the fourth invention, wherein the curvature of the top surface portion is ρ 1 [1 / mm] at the time of pressing in the preforming step, and the angle formed by the top surface portion and the side surface portion. Is θ 1 [°], the curvature of the top surface portion during pressing in the main forming step is ρ 2 [1 / mm], and the angle between the top surface portion and the side surface portion is θ 2 [°]. The following formulas (1) to (4) are satisfied.
ρ 1 / ρ 2 <1 (1)
ρ 1 / ρ 2 ≦ 0.06 × (θ 1 −θ 2 ) −1.22 (2)
ρ 1 / ρ 2 ≧ 0.012 × (θ 1 −θ 2 ) +0.136 (3)
θ 1 −θ 2 ≦ 47 (4)
この構成によると、成形部品にしわが生じるのを防止することができるとともに、加圧解除後に成形部品が口開き方向に変形するのをより確実に抑制することができる。   According to this configuration, it is possible to prevent the molded part from being wrinkled and to more reliably suppress the molded part from being deformed in the opening direction after the pressure is released.
第6の発明のプレス成形方法は、前記第1〜第5のいずれかの発明において、前記成形部品は、前記側面部の先端部から延在するフランジ部を有し、前記予備成形工程において、フランジ部が形成されるように前記予備成形部品をプレス成形することを特徴とする。   In the press molding method of the sixth invention, in any one of the first to fifth inventions, the molded part has a flange portion extending from a tip portion of the side surface portion, and in the preliminary molding step, The preformed part is press-molded so that a flange portion is formed.
この構成によると、フランジ部を有する成形部品を得ることができる。   According to this configuration, a molded part having a flange portion can be obtained.
第1実施形態のプレス成形工程を示す図であり、(a)は予備成形部品の斜視図であり、(b)および(c)は本成形工程において予備成形部品の天面部のみをプレスした直後の斜視図であり、(d)は本成形部品の斜視図である。It is a figure which shows the press molding process of 1st Embodiment, (a) is a perspective view of a preforming part, (b) and (c) are just after pressing only the top | upper surface part of a preforming part in this molding process. (D) is a perspective view of this molded part. 第1実施形態のプレス成形方法で用いる予備成形金型を示す図であって、(a)は(b)のA2−A2線断面図であり、(b)は(a)のA1−A1線断面図である。It is a figure which shows the preforming die used with the press molding method of 1st Embodiment, Comprising: (a) is A2-A2 sectional view taken on the line of (b), (b) is the A1-A1 line of (a). It is sectional drawing. 第1実施形態のプレス成形方法で用いる本成形金型を示す図であって、(a)は(b)のB2−B2線断面図であり、(b)は(a)のB1−B1線断面図である。It is a figure which shows this shaping | molding die used with the press molding method of 1st Embodiment, Comprising: (a) is B2-B2 sectional view taken on the line of (b), (b) is the B1-B1 line of (a). It is sectional drawing. 第2実施形態のプレス成形工程を示す図であり、(a)は予備成形部品の斜視図であり、(b)は本成形工程において加圧を解除した直後の成形部品の斜視図であり、(c)は最終形状の成形部品の斜視図である。It is a figure which shows the press molding process of 2nd Embodiment, (a) is a perspective view of a preformed part, (b) is a perspective view of the molded part immediately after releasing pressure in this molding process, (C) is a perspective view of the final shaped molded part. 第2実施形態のプレス成形方法で用いる予備成形金型を示す図であって、(a)は(b)のC2−C2線断面図であり、(b)は(a)のC1−C1線断面図である。It is a figure which shows the preforming die used with the press molding method of 2nd Embodiment, Comprising: (a) is C2-C2 sectional view taken on the line of (b), (b) is the C1-C1 line of (a). It is sectional drawing. 第2実施形態のプレス成形方法で用いる本成形金型を示す図であって、(a)は(b)のD2−D2線断面図であり、(b)は(a)のD1−D1線断面図である。It is a figure which shows this shaping | molding die used with the press molding method of 2nd Embodiment, Comprising: (a) is D2-D2 sectional view taken on the line of (b), (b) is D1-D1 line of (a). It is sectional drawing. (a)は本発明例の予備成形部品のプレス時の断面図であり、(b)は本発明例の成形部品のプレス時の断面図である。(A) is sectional drawing at the time of the press of the preforming component of the example of this invention, (b) is sectional drawing at the time of the press of the shaping | molding component of the example of this invention. 本発明例の成形部品の加圧解除後の状態を示す図であって、(a)は長手方向端部の図であり、(b)は側面図である。It is a figure which shows the state after the pressure release of the molded component of the example of this invention, Comprising: (a) is a figure of a longitudinal direction edge part, (b) is a side view. 曲率比ρ/ρと角度差(θ−θ)との関係を示すグラフである。It is a graph which shows the relationship between curvature ratio (rho) 1 / (rho) 2 and an angle difference ((theta) 1- (theta) 2 ).
<第1実施形態>
以下、本発明の第1実施形態について説明する。
本実施形態のプレス成形方法は、図1(d)に示す成形部品1をプレス成形する方法である。本実施形態のプレス成形方法では、予備成形金型10を用いて金属板Wから図1(a)に示す予備成形部品31をプレス成形し(予備成形工程)、その後、この予備成形部品31を図3に示す本成形金型20を用いてプレス成形して成形部品1を形成する(本成形工程)。金属板Wとしては、高張力鋼板(ハイテン材)が用いられるが、鋼板やアルミニウム板などを用いてもよい。なお、図2および図3は、断面のハッチングを省略している。
<First Embodiment>
The first embodiment of the present invention will be described below.
The press molding method of the present embodiment is a method for press molding the molded part 1 shown in FIG. In the press molding method of this embodiment, the preforming part 31 shown in FIG. 1A is press-molded from the metal plate W using the preforming mold 10 (preliminary molding step), and then the preforming part 31 is formed. The molded part 1 is formed by press molding using the main molding die 20 shown in FIG. 3 (main molding step). As the metal plate W, a high-tensile steel plate (high-tensile material) is used, but a steel plate, an aluminum plate, or the like may be used. 2 and 3 omit cross-sectional hatching.
まず、成形部品1について説明する。
図1(d)に示すように、成形部品1は、断面形状がハット形状の長尺部材であって、天面部2と、2つの側面部3と、2つのフランジ部4とから構成されている。成形部品1は、左右対称に形成されている。
First, the molded part 1 will be described.
As shown in FIG. 1 (d), the molded part 1 is a long member having a hat-shaped cross section, and includes a top surface portion 2, two side surface portions 3, and two flange portions 4. Yes. The molded part 1 is formed symmetrically.
天面部2は、曲率κで長手方向に湾曲している。天面部2の長手方向に直交する断面形状は、平坦状であって、天面部2の長手方向に直交する方向の幅は一定である。天面部2の長手方向長さ(湾曲方向に沿った長さ)は、例えば900mmであり、この長さの場合、曲率κは、例えば2.8×10−4〜2.9×10−4[1/mm]である。 Top surface portion 2 is curved in the longitudinal direction with a curvature kappa 1. The cross-sectional shape orthogonal to the longitudinal direction of the top surface portion 2 is flat, and the width in the direction orthogonal to the longitudinal direction of the top surface portion 2 is constant. The length in the longitudinal direction (length along the bending direction) of the top surface portion 2 is, for example, 900 mm. In this case, the curvature κ 1 is, for example, 2.8 × 10 −4 to 2.9 × 10 −. 4 [1 / mm].
2つの側面部3は、天面部2の長手方向に沿った両端から湾曲内側に(図3(d)中の下側に)延在している。側面部3は、ほぼ平坦状である。側面部の高さ(湾曲径方向の長さ)は一定である。側面部3と天面部2とがなす角度αは、例えば97〜99°である。 The two side surface portions 3 extend from both ends along the longitudinal direction of the top surface portion 2 to the inside of the curve (downward in FIG. 3D). The side part 3 is substantially flat. The height of the side surface portion (the length in the curved radial direction) is constant. An angle α 1 formed by the side surface portion 3 and the top surface portion 2 is, for example, 97 to 99 °.
2つのフランジ部4は、2つの側面部3の先端から外側(天面部2と反対側)に延在している。フランジ部4は、天面部2とほぼ同心状に湾曲している。フランジ部4と側面部3とがなす角度βは、例えば97〜99°である。 The two flange portions 4 extend outward from the tips of the two side surface portions 3 (on the side opposite to the top surface portion 2). The flange portion 4 is curved substantially concentrically with the top surface portion 2. Flange 4 and the side surface portion 3 and the angle beta 1 formed by is, for example, 97 to 99 °.
次に、予備成形金型10について説明する。
図2(a)に示すように、予備成形金型10は、下型パンチ11と、上型パッド12と、2つの上型ダイス13とから構成されている。
Next, the preforming mold 10 will be described.
As shown in FIG. 2A, the preforming die 10 is composed of a lower die punch 11, an upper die pad 12, and two upper die dies 13.
下型パンチ11は上面に、天面部成形面11aと、2つの側面部成形面11bと、2つのフランジ部成形面11cとを有している。   The lower die punch 11 has a top surface molding surface 11a, two side surface molding surfaces 11b, and two flange portion molding surfaces 11c on the upper surface.
図2(b)に示すように、天面部成形面11aは、上側に曲率ρ11(本発明のρに相当)で湾曲している。曲率ρ11と、本成形金型20の後述する天面部成形面21aの曲率ρ12(本発明のρに相当)と、成形部品1の天面部2の曲率κとの大小関係は、曲率ρ11>曲率ρ12≒曲率κである。 As shown in FIG. 2B, the top surface molding surface 11a is curved upward with a curvature ρ 11 (corresponding to ρ 1 of the present invention). The magnitude relationship between the curvature ρ 11 , the curvature ρ 12 (corresponding to ρ 2 of the present invention) of a ceiling surface molding surface 21 a described later of the molding die 20, and the curvature κ 1 of the ceiling surface portion 2 of the molded part 1 is as follows. Curvature ρ 11 > curvature ρ 12 ≈curvature κ 1
また、図2(a)に示すように、2つの側面部成形面11bは、天面部成形面11aの長手方向の両端に連設されている。側面部成形面11bと天面部成形面11aとがなす角度θ11と、本成形金型20の後述する天面部成形面21aと側面部成形面21bとがなす角度θ12と、成形部品1の天面部2と側面部3とがなす角度αとの大小関係は、角度θ11>角度θ12≒角度αである。 Further, as shown in FIG. 2A, the two side surface molding surfaces 11b are connected to both ends in the longitudinal direction of the top surface molding surface 11a. An angle θ 11 formed by the side surface molding surface 11 b and the top surface molding surface 11 a, an angle θ 12 formed by a top surface portion molding surface 21 a and the side surface molding surface 21 b described later of the molding die 20, and the molded part 1 The magnitude relationship between the angle α 1 formed by the top surface portion 2 and the side surface portion 3 is angle θ 11 > angle θ 12 ≈angle α 1 .
予備成形金型10の曲率ρ11および角度θ11は、本成形金型20の曲率ρ12および角度θ12に対して、下記式(1)〜(3)を満たすように設定されていることが好ましい。なお、下記の式において曲率の単位は[1/mm]で、角度の単位は[°]である。
1<ρ11/ρ12≦1.75 ……(1)
ρ11/ρ12≦0.15×(θ11−θ12)−4.55 ……(2)
θ11−θ12≦52 ……(3)
The curvature ρ 11 and the angle θ 11 of the preforming mold 10 are set so as to satisfy the following expressions (1) to (3) with respect to the curvature ρ 12 and the angle θ 12 of the forming mold 20. Is preferred. In the following formula, the unit of curvature is [1 / mm] and the unit of angle is [°].
1 <ρ 11 / ρ 12 ≦ 1.75 (1)
ρ 11 / ρ 12 ≦ 0.15 × (θ 11 −θ 12 ) −4.55 (2)
θ 11 −θ 12 ≦ 52 (3)
フランジ部成形面11cは、側面部成形面11bの下端に連設されている。フランジ部成形面11cは、天面部成形面11aとほぼ同心状に湾曲している。フランジ部成形面11cと側面部成形面11bとがなす角度ψ11は、後述する本成形金型20の側面部成形面21bとフランジ部成形面21cとがなす角度ψ12と同じであってもよいが異なっていてもよい。なお、本成形金型20の角度ψ12は、成形部品1の角度βとほぼ同じである。 The flange part molding surface 11c is connected to the lower end of the side part molding surface 11b. The flange portion molding surface 11c is curved substantially concentrically with the top surface portion molding surface 11a. Even if the angle ψ 11 formed by the flange portion forming surface 11c and the side surface forming surface 11b is the same as the angle ψ 12 formed by the side surface forming surface 21b and the flange portion forming surface 21c of the main molding die 20 described later. Good but may be different. The angle ψ 12 of the main mold 20 is substantially the same as the angle β 1 of the molded part 1.
上型パッド12は、下型パンチ11の天面部成形面11aの上側に配置され、公知の駆動手段によって上下方向に駆動される。図2(b)に示すように、上型パッド12の下面は、天面部成形面11aに沿うように曲率ρ11で湾曲している。 The upper die pad 12 is disposed above the top surface molding surface 11a of the lower die punch 11, and is driven in the vertical direction by a known driving means. As shown in FIG. 2 (b), the lower surface of the upper mold pad 12 is curved at a curvature [rho 11 along the top portion forming surface 11a.
上型ダイス13は、下型パンチ11の側面部成形面11bとフランジ部成形面11cの上側に配置される。2つの上型ダイス13は、公知の駆動手段によって同時に上下方向に駆動される。また、2つの上型ダイス13と上型パッド12とは独立して駆動される。上型ダイス13の下面は、下型パンチ11の側面部成形面11bとフランジ部成形面11cに沿うように形成された側面部成形面13aとフランジ部成形面13bとを有している。   The upper die 13 is disposed above the side surface molding surface 11b and the flange portion molding surface 11c of the lower die punch 11. The two upper dies 13 are simultaneously driven in the vertical direction by known driving means. Further, the two upper dies 13 and the upper die pad 12 are driven independently. The lower surface of the upper die 13 has a side surface molding surface 13a and a flange portion molding surface 13b formed along the side surface molding surface 11b and the flange portion molding surface 11c of the lower die punch 11.
次に、本成形金型20について説明する。
図3(a)に示すように、本成形金型20は、下型パンチ21と、上型パッド22と、2つの上型ダイス23とから構成されている。
Next, the main mold 20 will be described.
As shown in FIG. 3A, the main mold 20 includes a lower mold punch 21, an upper mold pad 22, and two upper mold dies 23.
下型パンチ21は上面に、天面部成形面21aと、2つの側面部成形面21bと、2つのフランジ部成形面21cとを有している。図3(b)に示すように、天面部成形面21aは、曲率ρ12で上側に湾曲している。図3(a)に示すように、2つの側面部成形面21bは、天面部成形面21aの長手方向の両端に連設されている。側面部成形面21bと天面部成形面21aとがなす角度をθ12とする。フランジ部成形面21cは、側面部成形面21bの下端に連設されている。フランジ部成形面21cと側面部成形面21bとがなす角度(上型ダイス23のフランジ部成形面23bと側面部成形面23aとがなす角度と同じ)をψ12とする。 The lower die punch 21 has a top surface molding surface 21a, two side surface molding surfaces 21b, and two flange portion molding surfaces 21c on the upper surface. As shown in FIG. 3 (b), the top surface portion forming surface 21a is curved upward with a curvature [rho 12. As shown in FIG. 3A, the two side surface molding surfaces 21b are connected to both ends in the longitudinal direction of the top surface molding surface 21a. The angle between the side surface portion forming surface 21b and the top surface portion forming surface 21a and theta 12. The flange part molding surface 21c is connected to the lower end of the side part molding surface 21b. The angle (same as flange forming surface 23b and the side portions forming surface 23a and the angle of the upper die 23) formed between the flange portion forming surface 21c and the side portions forming surface 21b is to [psi 12.
上型パッド22は、下型パンチ21の天面部成形面21aの上側に配置され、公知の駆動手段によって上下方向に駆動される。図3(b)に示すように、上型パッド22の下面は、天面部形成面21aに沿うように曲率ρ12で湾曲している。 The upper die pad 22 is disposed above the top surface molding surface 21a of the lower die punch 21 and is driven in the vertical direction by a known driving means. As shown in FIG. 3 (b), the lower surface of the upper die pad 22 are curved in the curvature [rho 12 along the top face forming surface 21a.
上型ダイス23は、下型パンチ21の側面部成形面21bとフランジ部成形面21cの上側に配置される。2つの上型ダイス23は、公知の駆動手段によって同時に上下方向に駆動される。また、2つの上型ダイス23と上型パッド22とは独立して駆動される。上型ダイス23の下面は、下型パンチ21の側面部成形面21bおよびフランジ部成形面21cに沿うように形成された側面部成形面23aとフランジ部成形面23bとを有している。   The upper die 23 is disposed above the side surface molding surface 21b and the flange portion molding surface 21c of the lower die punch 21. The two upper dies 23 are simultaneously driven in the vertical direction by known driving means. The two upper dies 23 and the upper die pad 22 are driven independently. The lower surface of the upper die 23 has a side surface molding surface 23 a and a flange portion molding surface 23 b formed along the side surface molding surface 21 b and the flange portion molding surface 21 c of the lower die punch 21.
以下、予備成形金型10および本成形金型20を用いたプレス成形工程について説明する。   Hereinafter, the press molding process using the preforming mold 10 and the main molding mold 20 will be described.
[予備成形工程]
まず、図2(a)中二点鎖線で示すように、予備成形金型10の上型ダイス13を上昇させた状態で、下型パンチ11の天面部成形面11aと上型パッド12との間で金属板Wを挟持して、天面部成形面11aに沿って金属板Wを湾曲させる。次に、上型ダイス13を下降させて、図2(a)中実線で示すように、側面部成形面11b、13aの間、および、フランジ部成形面11c、13bの間で金属板Wを挟持してプレス成形する。
[Preformation process]
First, as shown by a two-dot chain line in FIG. 2A, the upper die 13 of the lower die punch 11 and the upper die pad 12 with the upper die 13 of the preforming die 10 raised. The metal plate W is sandwiched therebetween, and the metal plate W is curved along the top surface forming surface 11a. Next, the upper die 13 is lowered, and the metal plate W is placed between the side surface molding surfaces 11b and 13a and between the flange surface molding surfaces 11c and 13b as shown by the solid line in FIG. Clamp and press mold.
このプレス成形によって、図1(a)に示すように、成形部品1の天面部2の曲率κよりも大きい曲率で湾曲した天面部32と、この天面部32となす角度が成形部品1の天面部2と側面部3とがなす角度αよりも大きい2つの側面部33と、2つのフランジ部34とから構成される予備成形部品31が得られる。なお、型から解放した後の予備成形部品31の天面部32の曲率は、スプリングバックによって、予備成形金型10の曲率ρ11よりも若干小さくなっている。また、天面部32と側面部33とがなす角度は、スプリングバックによって、予備成形金型10の角度θ11よりも若干大きくなっている。 By this press molding, as shown in FIG. 1 (a), the top surface portion 32 curved with a curvature larger than the curvature κ 1 of the top surface portion 2 of the molded part 1, and the angle formed with the top surface portion 32 is A preformed part 31 composed of two side surface portions 33 larger than the angle α 1 formed by the top surface portion 2 and the side surface portion 3 and two flange portions 34 is obtained. The curvature of the top surface portion 32 of the preformed part 31 after being released from the mold is slightly smaller than the curvature ρ 11 of the preforming mold 10 due to the spring back. Further, the angle formed between the top surface portion 32 and the side surface portion 33 is slightly larger than the angle θ 11 of the preforming mold 10 due to the spring back.
[本成形工程]
次に、図3(a)中二点鎖線で示すように、本成形金型20の上型ダイス23を上昇させた状態で、下型パンチ21の天面部成形面21aと上型パッド22との間で予備成形部品31の天面部32を挟持して、図1(b)に示すように、天面部32を曲率が小さくなる方向に変形させる。
[Main molding process]
Next, as shown by a two-dot chain line in FIG. 3A, with the upper die 23 of the main mold 20 raised, the top surface molding surface 21a of the lower die punch 21 and the upper die pad 22 As shown in FIG. 1B, the top surface 32 is deformed in a direction in which the curvature decreases.
これにより、側面部33およびフランジ部34は長手方向に伸ばされて、側面部33およびフランジ部34には、図1(b)中矢印で示すような引張応力が一時的に発生しようとする。このとき、側面部33およびフランジ部34は、下型パンチ21および上型ダイス23に接触しておらず、自由に変形できるため、図1(c)に示すように、側面部33は上記の引張応力を緩和する方向に変形する。具体的には、2つの側面部33の下端が口閉じ方向に引き寄せられ、側面部33の上側部分が外側に湾曲するように変形する。   Thereby, the side part 33 and the flange part 34 are extended in the longitudinal direction, and a tensile stress as shown by an arrow in FIG. 1B tends to be temporarily generated in the side part 33 and the flange part 34. At this time, the side surface portion 33 and the flange portion 34 are not in contact with the lower die punch 21 and the upper die 23 and can be freely deformed. Therefore, as shown in FIG. Deforms in a direction to relieve tensile stress. Specifically, the lower ends of the two side surface portions 33 are drawn in the mouth closing direction, and the upper portion of the side surface portion 33 is deformed to be bent outward.
この状態で、上型ダイス23を下降させて、図2(a)中実線で示すように、側面部成形面21b、23aの間、および、フランジ部成形面21c、23bの間で、予備成形部品31の側面部33およびフランジ部34を挟持してプレス成形する。このプレス成形によって、図1(d)に示すように、天面部2と2つの側面部3と2つのフランジ部4とからなる成形部品1が成形される。   In this state, the upper die 23 is lowered, and preforming is performed between the side surface molding surfaces 21b and 23a and between the flange surface molding surfaces 21c and 23b as shown by a solid line in FIG. The side part 33 and the flange part 34 of the part 31 are clamped and press-molded. By this press molding, as shown in FIG. 1 (d), a molded part 1 including the top surface portion 2, the two side surface portions 3, and the two flange portions 4 is molded.
成形部品1を型から解放すると、スプリングバック(弾性回復)によって成形部品1は口開き方向に変形しようとする。詳細には、側面部と天面部との連結部分が曲げ角度が大きくなるように変形しようとすると共に、側面部が反るように変形しようとする。このとき、成形部品1の側面部3には、本成形工程において天面部32のみをプレスしたときに生じた変形癖が残っており、この変形癖は口閉じ方向に作用する。そのため、スプリングバックによる口開き方向の変形を、この変形癖によって打ち消す(または緩和する)ことができる。したがって、成形部品1が加圧解除後に口開き方向に変形するのを抑制することができる。   When the molded part 1 is released from the mold, the molded part 1 tends to deform in the opening direction by springback (elastic recovery). More specifically, the connecting portion between the side surface portion and the top surface portion tends to be deformed so that the bending angle becomes large, and the side surface portion tends to be warped. At this time, a deformed wrinkle generated when only the top surface portion 32 is pressed in the main forming process remains on the side surface portion 3 of the molded part 1, and this deformed wrinkle acts in the mouth closing direction. Therefore, the deformation in the opening direction due to the spring back can be canceled (or alleviated) by this deformation flaw. Therefore, it is possible to suppress the molded part 1 from being deformed in the opening direction after the pressure is released.
また、予備成形工程において、成形部品1の天面部2の曲率κよりも大きい曲率ρ11に天面部32を成形し、本成形工程では、天面部32を曲率が小さくなる方向に変形させているため、曲率が小さくなる方向の天面部2のスプリングバックを低減できる。したがって、天面部2が加圧解除後に曲率が小さくなる方向に変形するのを抑制することができる。 Further, in the preforming step, and molding the top surface 2 of the top surface portion 32 to the curvature [rho 11 greater than the curvature kappa 1 of the molded part 1, in this molding step, is deformed in a direction in which the top face portion 32 curvature decreases Therefore, the spring back of the top surface part 2 in the direction in which the curvature decreases can be reduced. Therefore, it can suppress that the top | upper surface part 2 deform | transforms in the direction in which a curvature becomes small after pressure cancellation.
また、予備成形金型10と本成形金型20の曲率ρ11、ρ12および角度θ11、θ12を上述した式(1)〜(3)を満たす範囲内の値に設定することにより、成形部品1にしわが生じるのを防止することができるとともに、成形部品1が加圧解除後に口開き方向に変形するのをより確実に抑制することができる。また、成形部品1の天面部2が加圧解除後に曲率が小さくなる方向に変形するのをより確実に抑制することができる。 Further, by setting the curvatures ρ 11 and ρ 12 and the angles θ 11 and θ 12 of the preforming mold 10 and the main molding mold 20 to values within the ranges satisfying the above-described formulas (1) to (3), It is possible to prevent the molded part 1 from being wrinkled and to more reliably suppress the molded part 1 from being deformed in the opening direction after the pressure is released. Moreover, it can suppress more reliably that the top | upper surface part 2 of the molded component 1 deform | transforms in the direction in which a curvature becomes small after pressure release.
また、従来のプレス成形方法として、加圧解除後のスプリングバックによる口開き量を見込んで、成形金型の曲げ加工部の角度(本実施形態の角度θ12に相当)を、目標とする成形部品の角度よりも小さめ(例えば8°程度)に設定してプレス成形する方法があるが、この場合、金型の曲げ部分の角度を90°未満に設定することはできないため、天面部と側面部とのなす角度が例えば90〜95°程度であるような成形部品を得ることはできない。
一方、本実施形態では、加圧解除後の口開き変形を抑制することができるため、天面部と側面部とのなす角度が90°付近の成形部品1を得ることができる。
Further, as a conventional press forming method, it anticipates the opening amounts mouth by spring back after the release of pressure, the angle of the bent portion of the mold (corresponding to the angle theta 12 of the present embodiment), the target molding There is a method of press molding by setting it to be smaller than the angle of the part (for example, about 8 °), but in this case, the angle of the bending portion of the mold cannot be set to less than 90 °, so the top surface portion and the side surface For example, it is not possible to obtain a molded part having an angle of 90 to 95 ° with the portion.
On the other hand, in this embodiment, since opening deformation after pressure release can be suppressed, the molded part 1 in which the angle formed between the top surface portion and the side surface portion is approximately 90 ° can be obtained.
<第2実施形態>
次に、本発明の第2実施形態について説明する。
本実施形態のプレス成形方法は、図4(c)に示す成形部品101をプレス成形する方法である。本実施形態のプレス成形方法では、図5に示す予備成形金型40を用いて金属板Wから図4(a)に示す予備成形部品61をプレス成形し(予備成形工程)、その後、この予備成形部品61を図6に示す本成形金型50を用いてプレス成形して成形部品101を形成する(本成形工程)。金属板Wとしては、高張力鋼板(ハイテン材)が用いられる。鋼板やアルミニウム板などを用いてもよい。なお、図5および図6は、断面のハッチングを省略している。
Second Embodiment
Next, a second embodiment of the present invention will be described.
The press molding method of the present embodiment is a method for press molding the molded part 101 shown in FIG. In the press molding method of the present embodiment, the preforming part 61 shown in FIG. 4A is press-molded from the metal plate W using the preforming mold 40 shown in FIG. 5 (preliminary molding step), and then this preliminary molding is performed. The molded part 61 is press-molded using the main molding die 50 shown in FIG. 6 to form the molded part 101 (main molding process). As the metal plate W, a high-tensile steel plate (high-tensile material) is used. A steel plate, an aluminum plate, or the like may be used. 5 and 6 omit cross-sectional hatching.
まず、成形部品101について説明する。
図4(c)に実線で示すように、成形部品101は、第1実施形態の成形部品1(図1(d)参照)とほぼ同じ形状であって、天面部102と、2つの側面部103と、2つのフランジ部104とから構成されている。天面部102の曲率をκ101とし、側面部103と天面部102とがなす角度をα101とし、フランジ部104と側面部103とがなす角度をβ101とする。曲率κ101は、後述する本成形金型50の上型パッド52の下面の曲率(天面部成形面51aの曲率)ρ22よりも若干小さい。
First, the molded part 101 will be described.
As shown by a solid line in FIG. 4C, the molded part 101 has substantially the same shape as the molded part 1 of the first embodiment (see FIG. 1D), and has a top surface portion 102 and two side surface portions. 103 and two flange portions 104. The curvature of the top surface portion 102 is κ 101 , the angle formed by the side surface portion 103 and the top surface portion 102 is α 101, and the angle formed by the flange portion 104 and the side surface portion 103 is β 101 . The curvature κ 101 is slightly smaller than the curvature ρ 22 of the lower surface of the upper pad 52 of the main molding die 50 described later (the curvature of the top surface molding surface 51a).
次に、予備成形金型40について説明する。
図5(a)に示すように、予備成形金型40は、第1実施形態の予備成形金型10と同様に、下型パンチ41と、上型パッド42と、2つの上型ダイス43とから構成されている。予備成形金型40の下型パンチ41の天面部成形面41aの曲率ρ21(本発明のρに相当)と、本成形金型50の天面部成形面51aの曲率(上型パッド52の下面の曲率)ρ22(本発明のρに相当)との大小関係は、上記第1実施形態とは逆に、曲率ρ21<曲率ρ22である。予備成形金型40のその他の構成は、上記第1実施形態の予備形成金型10とほぼ同じである。
Next, the preforming mold 40 will be described.
As shown in FIG. 5 (a), the preforming mold 40 is similar to the preforming mold 10 of the first embodiment, in that a lower mold punch 41, an upper mold pad 42, two upper mold dies 43, It is composed of The curvature ρ 21 (corresponding to ρ 1 of the present invention) of the top surface molding surface 41 a of the lower mold punch 41 of the preforming mold 40 and the curvature (corresponding to the top surface molding surface 51 a of the present molding die 50). Contrary to the first embodiment, the magnitude relationship with the curvature of the lower surface ρ 22 (corresponding to ρ 2 of the present invention) is curvature ρ 21 <curvature ρ 22 . Other configurations of the preforming mold 40 are substantially the same as those of the preforming mold 10 of the first embodiment.
図5(a)に示すように、下型パンチ41の側面部成形面41bと天面部成形面41aとがなす角度をθ21とすると、この角度θ21と、本成形金型50の後述する天面部成形面51aと側面部成形面51bとがなす角度θ22と、成形部品101の天面部102と側面部103とがなす角度α101との大小関係は、上記第1実施形態と同じく、角度θ21>角度θ22≒角度α101である。 As shown in FIG. 5A, when the angle formed by the side surface molding surface 41b of the lower die punch 41 and the top surface molding surface 41a is θ 21 , this angle θ 21 and this molding die 50 will be described later. The magnitude relationship between the angle θ 22 formed between the top surface forming surface 51a and the side surface forming surface 51b and the angle α 101 formed between the top surface portion 102 and the side surface portion 103 of the molded part 101 is the same as in the first embodiment. Angle θ 21 > angle θ 22 ≈angle α 101 .
また、上型ダイス43のフランジ部成形面43bと側面部成形面43aとがなす角度をψ21とする。角度ψ21は、上記第1実施形態と同じく、後述する本成形金型50の側面部成形面51bとフランジ部成形面51cとがなす角度ψ22と同じであってもよいが異なっていてもよい。 Further, the angle between the flange portion forming surface 43b and the side portion forming surface 43a of the upper die 43 forms a [psi 21. The angle ψ 21 may be the same as or different from the angle ψ 22 formed by the side surface molding surface 51b and the flange portion molding surface 51c of the main molding die 50 described later, as in the first embodiment. Good.
予備成形金型40の曲率ρ21および角度θ21は、本成形金型50の曲率ρ22および角度θ22に対して、下記式(1)〜(4)を満たすように設定されていることが好ましい。なお、下記の式において曲率の単位は[1/mm]で、角度の単位は[°]である。
ρ21/ρ22<1 ……(1)
ρ21/ρ22≦0.06×(θ21−θ22)−1.22……(2)
ρ21/ρ22≧0.012×(θ21−θ22)+0.136……(2)
θ21−θ22≦47 ……(4)
The curvature ρ 21 and the angle θ 21 of the preforming mold 40 are set so as to satisfy the following expressions (1) to (4) with respect to the curvature ρ 22 and the angle θ 22 of the forming mold 50. Is preferred. In the following formula, the unit of curvature is [1 / mm] and the unit of angle is [°].
ρ 21 / ρ 22 <1 (1)
ρ 21 / ρ 22 ≦ 0.06 × (θ 21 −θ 22 ) −1.22 (2)
ρ 21 / ρ 22 ≧ 0.012 × (θ 21 −θ 22 ) +0.136 (2)
θ 21 −θ 22 ≦ 47 (4)
次に、本成形金型50について説明する。
図6(a)に示すように、本成形金型50は、下型パンチ51と、上型パッド52と、2つの上型ダイス53とから構成されている。本成形金型50は、第1実施形態の本成形金型20とほぼ同じ形状であるが、本成形金型50の天面部成形面51aの曲率ρ22は、成形部品101の天面部102のスプリングバックによる変形を見込んで、天面部102の曲率κ101よりも若干大きい値に設定される。本成形金型50のその他の構成は、上記第1実施形態の本成形金型20と同じである。下型パンチ51の側面部成形面51bと天面部成形面51aとがなす角度をθ22とし、上型ダイス53のフランジ部成形面53bと側面部成形面53aとがなす角度をψ22とする。
Next, the main mold 50 will be described.
As shown in FIG. 6A, the main mold 50 includes a lower mold punch 51, an upper mold pad 52, and two upper dies 53. The main mold 50 has substantially the same shape as the main mold 20 of the first embodiment, but the curvature ρ 22 of the top surface molding surface 51 a of the main mold 50 is the same as that of the top surface 102 of the molded part 101. In view of deformation due to springback, the value is set to be slightly larger than the curvature κ 101 of the top surface portion 102. Other configurations of the main mold 50 are the same as those of the main mold 20 of the first embodiment. The angle between the side surface portion forming surface 51b and the top portion forming surface 51a of the lower punch 51 and theta 22, the angle between the flange portion forming surface 53b and the side portions forming surface 53a of the upper die 53 makes with the [psi 22 .
以下、予備成形金型40および本成形金型50を用いたプレス成形工程について説明する。   Hereinafter, the press molding process using the preliminary molding die 40 and the main molding die 50 will be described.
[予備成形工程]
まず、図5(a)中二点鎖線で示すように、予備成形金型40の上型ダイス43を上昇させた状態で、下型パンチ41の天面部成形面41aと上型パッド42との間で金属板Wを挟持して、天面部成形面41aに沿って金属板Wを湾曲させる。次に、上型ダイス43を下降させて、図5(a)中実線で示すように、側面部成形面41b、43aの間、および、フランジ部成形面41c、43bの間で金属板Wを挟持してプレス成形する。
[Preformation process]
First, as indicated by a two-dot chain line in FIG. 5A, the upper die 43 of the lower die punch 41 and the upper die pad 42 with the upper die 43 of the preforming die 40 raised. The metal plate W is sandwiched therebetween, and the metal plate W is curved along the top surface forming surface 41a. Next, the upper die 43 is lowered, and the metal plate W is moved between the side surface molding surfaces 41b and 43a and between the flange surface molding surfaces 41c and 43b as shown by the solid line in FIG. Clamp and press mold.
このプレス成形によって、図4(a)に示すように、成形部品101の天面部102の曲率κ101よりも小さい曲率で湾曲した天面部62と、この天面部62となす角度が成形部品101の天面部102と側面部103とがなす角度α101よりも大きい2つの側面部63と、2つのフランジ部64とから構成される予備成形部品61が得られる。なお、型から解放した後の予備成形部品61の天面部62の曲率は、スプリングバックによって、予備成形金型40の曲率ρ21よりも若干小さくなっている。また、天面部62と側面部63とがなす角度は、スプリングバックによって、予備成形金型40の角度θ21よりも若干大きくなっている。 By this press molding, as shown in FIG. 4A, the top surface portion 62 curved with a curvature smaller than the curvature κ 101 of the top surface portion 102 of the molded component 101, and the angle formed by the top surface portion 62 is A preformed part 61 composed of two side surface parts 63 larger than the angle α 101 formed by the top surface part 102 and the side surface part 103 and two flange parts 64 is obtained. Note that the curvature of the top surface portion 62 of the preformed part 61 after being released from the mold is slightly smaller than the curvature ρ 21 of the preforming mold 40 due to the spring back. The angle formed between the top surface portion 62 and the side surface portion 63 is slightly larger than the angle θ 21 of the preforming mold 40 due to the spring back.
[本成形工程]
次に、図6(a)中二点鎖線で示すように、本成形金型50の上型ダイス53を上昇させた状態で、下型パンチ51の天面部成形面51aと上型パッド52との間で予備成形部品61の天面部62を挟持して、天面部62を曲率が大きくなる方向に変形させる。
[Main molding process]
Next, as shown by a two-dot chain line in FIG. 6A, with the upper die 53 of the main die 50 raised, the top surface molding surface 51a of the lower die punch 51 and the upper die pad 52 The top surface portion 62 of the preformed part 61 is sandwiched between the top surface portion 62 and the top surface portion 62 is deformed in a direction in which the curvature increases.
続いて、上型ダイス53を下降させて、図5(a)中実線で示すように、側面部成形面51b、53aの間、および、フランジ部成形面51c、53bの間で、予備成形部品61の側面部63およびフランジ部64を挟持してプレス成形する。このプレス成形によって、図4(b)に示すように、天面部102と2つの側面部103と2つのフランジ部104とからなる成形部品101が成形される。   Subsequently, the upper die 53 is lowered, and as shown by the solid line in FIG. 5A, a preformed part is formed between the side surface forming surfaces 51b and 53a and between the flange portion forming surfaces 51c and 53b. The side part 63 and the flange part 64 of 61 are clamped and press-molded. By this press molding, as shown in FIG. 4B, a molded part 101 including the top surface portion 102, the two side surface portions 103, and the two flange portions 104 is molded.
成形部品101を型から解放すると、成形部品101の天面部102には、予備成形工程において本成形金型50の曲率ρ22よりも小さい曲率ρ21に成形した際の変形癖が残っている。この変形癖と、本成形工程のプレスによるスプリングバックとによって、成形部品101の天面部102は、曲率が小さくなる方向に変形する。 When the molded part 101 is released from the mold, a deformed wrinkle when the molded part 101 is molded to a curvature ρ 21 smaller than the curvature ρ 22 of the main molding die 50 remains in the top surface portion 102 of the molded part 101. The top surface portion 102 of the molded part 101 is deformed in a direction in which the curvature is reduced by the deformation wrinkle and the spring back by the press in the main forming step.
これにより、側面部103およびフランジ部104は長手方向に伸ばされて、側面部103およびフランジ部104には、図4(b)中矢印で示すような引張応力が一時的に発生しようとする。すると、図4(c)に示すように、側面部103は上記の引張応力を緩和する方向に変形する。具体的には、側面部103の下端が口閉じ方向に引き寄せられるように変形する。この変形によって、スプリングバックによる口開き方向の変形(コーナー部分の曲げ角度が広くなる変形と、側面部の反り)が打ち消される(または緩和される)。したがって、成形部品101が加圧解除後に口開き方向に変形するのを抑制することができる。   Thereby, the side surface portion 103 and the flange portion 104 are extended in the longitudinal direction, and a tensile stress as indicated by an arrow in FIG. 4B tends to be temporarily generated in the side surface portion 103 and the flange portion 104. Then, as shown in FIG.4 (c), the side part 103 deform | transforms in the direction which relieves said tensile stress. Specifically, the side portion 103 is deformed so that the lower end of the side portion 103 is pulled in the closing direction. By this deformation, deformation in the opening direction due to the spring back (deformation in which the bending angle of the corner portion becomes wide and warpage of the side surface portion) is canceled (or mitigated). Therefore, it is possible to suppress the molded part 101 from being deformed in the opening direction after the pressure is released.
また、上述したように、加圧解除後、成形部品101の天面部102は、曲率が小さくなる方向に変形するが、天面部102は、予備成形工程と本成形工程において2回プレスされているため、上記変形量は、成形部品を1回成形によって成形した場合のスプリングバックによる変形量に比べて小さい。すなわち、成形部品を1回成形によって成形した場合に比べると、成形部品の天面部が加圧解除後に曲率が小さくなる方向に変形するのを抑制することができる。   Further, as described above, after releasing the pressure, the top surface portion 102 of the molded part 101 is deformed in a direction in which the curvature decreases, but the top surface portion 102 is pressed twice in the pre-forming step and the main forming step. Therefore, the amount of deformation is smaller than the amount of deformation due to springback when the molded part is formed by one-time molding. That is, as compared with the case where the molded part is molded by one-time molding, it is possible to suppress the top surface portion of the molded part from being deformed in a direction in which the curvature decreases after the pressure is released.
また、予備成形金型40と本成形金型50の曲率ρ21、ρ22および角度θ21、θ22を上述した式(1)〜(4)を満たす範囲内の値に設定することにより、成形部品101にしわが生じるのを防止することができるとともに、加圧解除後に成形部品101が口開き方向に変形するのをより確実に抑制することができる。 Further, by setting the curvatures ρ 21 and ρ 22 and the angles θ 21 and θ 22 of the preforming mold 40 and the main forming mold 50 to values within the ranges satisfying the above-described formulas (1) to (4), Wrinkles can be prevented from occurring in the molded part 101, and deformation of the molded part 101 in the opening direction after release of pressure can be more reliably suppressed.
また、本実施形態では、加圧解除後の口開き変形を抑制することができるため、口開き量を見込んで成形する場合には製造することのできない、天面部と側面部とのなす角度が90°付近の成形部品を得ることができる。   Moreover, in this embodiment, since it is possible to suppress the opening deformation after the release of pressure, the angle formed between the top surface portion and the side surface portion that cannot be manufactured when molding is performed in anticipation of the opening amount. Molded parts around 90 ° can be obtained.
以上、本発明の好適な実施形態として、第1実施形態および第2実施形態を説明したが、上記の実施形態は以下のように変更して実施することができる。   As mentioned above, although 1st Embodiment and 2nd Embodiment were described as suitable embodiment of this invention, said embodiment can be changed and implemented as follows.
上記実施形態で成形される成形部品は、2つのフランジ部を有する形状であるが、2つのフランジ部の一方または両方を有しない形状であってもよい。   The molded part molded in the above embodiment has a shape having two flange portions, but may have a shape without one or both of the two flange portions.
上記実施形態で成形される成形部品は、一方の側面部と天面部とがなす角度と、他方の側面部と天面部とがなす角度が互いに同じであるが、異なっていてもよい。   In the molded part molded in the above embodiment, the angle formed by one side surface portion and the top surface portion and the angle formed by the other side surface portion and the top surface portion are the same, but may be different.
上記実施形態で成形される成形部品は、2つの側面部は、高さ(湾曲径方向の長さ)が互いに同じであるが、異なっていてもよい。   In the molded part molded in the above embodiment, the two side surface portions have the same height (length in the curved radial direction), but may be different from each other.
上記実施形態で成形される成形部品は、側面部の下辺が、天面部と同心状の湾曲形状であって、側面部の高さ(湾曲径方向の長さ)が一定となっているが、上述したようにフランジ部を設けない場合には、一定でなくてもよい。例えば、側面部の高さが、長手方向の一端から他端に向かって徐々に大きくなっていてもよい。   In the molded part molded in the above embodiment, the lower side of the side part is a curved shape concentric with the top surface part, and the height of the side part (the length in the curved radial direction) is constant, As described above, when the flange portion is not provided, it may not be constant. For example, the height of the side surface portion may gradually increase from one end in the longitudinal direction toward the other end.
上記実施形態で成形される成形部品の天面部は、円弧形状に湾曲している(すなわち、長手方向全域において曲率をもっている)が、長手方向の一部分(略中央部が好ましい)のみにおいて、曲率をもって湾曲した形状であってもよい。なお、本発明における「長手方向に所定の曲率で湾曲する天面部」とは、上記実施形態のように、長手方向全域で同じ曲率で湾曲している場合だけでなく、本変更形態のように、長手方向の一部において所定の曲率で湾曲している場合も含むものとする。   The top surface portion of the molded part molded in the above embodiment is curved in an arc shape (that is, has a curvature in the entire longitudinal direction), but has a curvature only in a part in the longitudinal direction (preferably a substantially central portion). It may be a curved shape. In the present invention, the “top surface portion curved with a predetermined curvature in the longitudinal direction” is not limited to the case where it is curved with the same curvature in the entire longitudinal direction as in the above embodiment, but as in the present modified embodiment. In addition, it includes a case where a part of the longitudinal direction is curved with a predetermined curvature.
次に、本発明の効果を実証するために、有限要素法(FEM)によるシミュレーション解析を行った。使用ソフトは、JSTAMP/NV 2.2.0とした。   Next, in order to verify the effect of the present invention, a simulation analysis by a finite element method (FEM) was performed. The software used was JSTAMP / NV 2.2.0.
本発明例として、板厚1.2mm、980MPa級(降伏強度(YP)712MPa、引張強度(TS)1090MPa、破断伸び(EL)13.9%)の冷延高張力鋼板を用いて、上記第1または第2実施形態と同様の手順で、図1(d)に示すような成形部品をプレス成形するシミュレーションを行った。成形部品の長手方向長さは、900mmとした。この長さは、後述する比較例も同じである。また、予備成形部品および成形部品の加圧解除前の断面形状および断面の寸法を図7(a)および(b)に示す。予備成形工程のプレス時における予備成形部品の天面部の曲率ρ、天面部と側面部とがなす角度θは、表1に示す値とした。また、本成形工程のプレス時における成形部品の天面部の曲率ρは2.86×10−4[1/mm]し、天面部と側面部とがなす角度θは98°とした。
なお、表1に示すように、本発明例1、2では、上述した第1実施形態と同じく、予備成形工程において、成形部品の天面部の曲率よりも大きい曲率に予備成形部品を成形し、本発明例3、4では、上述した第2実施形態と同じく、予備成形工程において、成形部品の天面部の曲率よりも小さい曲率に予備成形部品を成形している。
As an example of the present invention, a cold-rolled high-tensile steel plate having a thickness of 1.2 mm, a 980 MPa class (yield strength (YP) 712 MPa, tensile strength (TS) 1090 MPa, elongation at break (EL) 13.9%) is used. A simulation for press-molding a molded part as shown in FIG. 1D was performed in the same procedure as in the first or second embodiment. The length of the molded part in the longitudinal direction was 900 mm. This length is the same in the comparative example described later. 7A and 7B show the cross-sectional shape and the cross-sectional dimensions of the preformed part and the molded part before releasing the pressure. The curvature ρ 1 of the top surface portion of the preformed part and the angle θ 1 formed by the top surface portion and the side surface portion at the time of pressing in the preforming step were values shown in Table 1. Further, the curvature ρ 2 of the top surface portion of the molded part at the time of pressing in the main forming step was 2.86 × 10 −4 [1 / mm], and the angle θ 2 formed by the top surface portion and the side surface portion was 98 °.
As shown in Table 1, in Invention Examples 1 and 2, as in the first embodiment described above, in the preforming step, the preformed part is molded to a curvature larger than the curvature of the top surface portion of the molded part, In Invention Examples 3 and 4, as in the second embodiment described above, in the preforming step, the preformed part is molded with a curvature smaller than the curvature of the top surface portion of the molded part.
比較例1として、本発明例と同形状の本成形金型を使用して1回成形により成形部品をプレス成形するシミュレーションを行った。   As Comparative Example 1, a simulation was performed in which a molded part was press-molded by one-time molding using a main mold having the same shape as the present invention.
比較例2として、予備成形工程のプレス時における予備成形部品の天面部の曲率ρと、本成形工程のプレス時における成形部品の天面部の曲率ρを共に2.86×10−4[1/mm]とし、予備成形工程のプレス時における天面部と側面部とがなす角度θを表1に示す値とし、本成形工程のプレス時における天面部と側面部とがなす角度θを98°として、成形部品をプレス成形するシミュレーションを行った。 As Comparative Example 2, the curvature ρ 1 of the top surface portion of the preformed part at the time of pressing in the preforming step and the curvature ρ 2 of the top surface portion of the molded component at the time of pressing in the main forming step are both 2.86 × 10 −4 [ 1 / mm], and the angle θ 1 formed between the top surface portion and the side surface portion during pressing in the preforming step is set to the value shown in Table 1, and the angle θ 2 formed between the top surface portion and the side surface portion during pressing in the main forming step. A simulation of press-molding a molded part was performed with the angle of 98 °.
本発明例および比較例の成形部品について、側板部のしわを評価した。具体的には、上型ダイス(図3および図6の上型ダイス23、53参照)を下死点(プレス時の最下点)から1mm上昇させたときに、側面部が下型パンチと上型ダイスの両方に接するように波打っている場合に、「しわ大」と判定した。その結果も表1に示す。なお、しわ大と判定されなかった場合には、表1に○印を表示した。   For the molded parts of the inventive examples and comparative examples, the wrinkles of the side plate portions were evaluated. Specifically, when the upper die (see the upper dies 23 and 53 in FIGS. 3 and 6) is raised 1 mm from the bottom dead center (the lowest point during pressing), the side surface portion is aligned with the lower die punch. When wavy so as to come into contact with both upper dies, it was judged as “wrinkle large”. The results are also shown in Table 1. When it was not determined that the wrinkle was large, a circle mark was displayed in Table 1.
また、しわ大と判定されなかった成形部品(以下、しわが無かった成形部品という)について、加圧解除前後での側面部の口開き量(側面部の下端の水平方向の変位量)ΔD(図8(a)参照)と、加圧解除前後での天面部の長手方向端部の高さ方向の変位量ΔH(図8(b)参照)を解析した。その結果も表1に示す。口開き量ΔDは、成形部品の長手方向の一端と中央の2箇所で測定した値の平均値であって、口開き方向の変位をプラスとし、口閉じ方向の変位をマイナスとした。また、変位量ΔHは、上方向の変位(天面部の曲率が小さくなる方向の変位)をプラスとし、下方向の変位をマイナスとした。   Further, for a molded part that has not been determined to be wrinkle large (hereinafter referred to as a molded part without wrinkle), the opening amount of the side surface portion before and after the release of pressure (the horizontal displacement amount of the lower end of the side surface portion) ΔD ( 8A) and a displacement amount ΔH (see FIG. 8B) in the height direction of the longitudinal end portion of the top surface part before and after releasing the pressure. The results are also shown in Table 1. The opening amount ΔD is an average value of values measured at one end and the center in the longitudinal direction of the molded part, and the displacement in the opening direction is positive, and the displacement in the closing direction is negative. In addition, the displacement amount ΔH is defined as positive for upward displacement (displacement in the direction in which the curvature of the top surface becomes smaller) and negative for downward displacement.
表1に示すように、本発明例のうち、しわが無かった本発明例2−3〜5、3−1〜4、4−1〜3は、1回成形の比較例1に比べて、口開き量ΔDが小さくなっている。
また、上述の本発明例2−3〜5、3−1〜4、4−1〜3と、しわが無かった比較例2−2〜5とを、角度差(ρ−ρ)が同じ場合について比較すると、本発明例の方が、口開き量ΔDが小さくなっている。
As shown in Table 1, among the inventive examples, the inventive examples 2-3 to 3, 3-1 to 4, and 4 to 1 having no wrinkles are compared to the comparative example 1 of single molding, The opening amount ΔD is small.
In addition, the above-described inventive examples 2-3 to 5, 3-1 to 4, 4-1 to 3 and the comparative examples 2-2 to 5 having no wrinkles have an angular difference (ρ 1 −ρ 2 ). When the same case is compared, the opening amount ΔD is smaller in the example of the present invention.
また、本発明例2−3〜5、3−1〜4、4−1〜3は、1回成形の比較例1に比べて、天面部の変位量ΔHが小さくなっている。
また、曲率比ρ/ρが1より大きい本発明例2−3〜5は、曲率比ρ/ρが1である比較例2に比べて、天面部の変位量ΔHが小さくなっている。
Further, in the inventive examples 2-3 to 5, 3-1 to 4, and 4-1 to 3, the displacement amount ΔH of the top surface portion is smaller than that of the first comparative example 1.
Further, Invention Examples 2-3 to 5 in which the curvature ratio ρ 1 / ρ 2 is larger than 1 have a smaller displacement ΔH of the top surface portion than the comparative example 2 in which the curvature ratio ρ 1 / ρ 2 is 1. ing.
次に、本発明例および比較例の結果を基にして、しわが無く且つ口開き量ΔDを抑制できるような曲率比ρ/ρと角度差(θ−θ)の条件を求めた。図9は、しわが無く且つ口開き量ΔDが小さいという結果が得られた本発明例2−3〜5、3−1〜4、4−1〜3および比較例2−2〜5の、曲率比ρ/ρと角度差(θ−θ)の関係を示すグラフである。 Next, based on the results of the present invention example and the comparative example, conditions for the curvature ratio ρ 1 / ρ 2 and the angle difference (θ 1 −θ 2 ) that are free of wrinkles and can suppress the opening amount ΔD are obtained. It was. FIG. 9 shows the results of Examples 2-3 to 5, 3-1 to 4, 4-1 to 3 and Comparative Examples 2-2 to 5 of the present invention in which no wrinkles and a small opening amount ΔD were obtained. It is a graph which shows the relationship between curvature ratio (rho) 1 / (rho) 2 and an angle difference ((theta) 1- (theta) 2 ).
図9に示すように、本発明例2−3の点と比較例2−2の点とを結ぶ直線は、ρ/ρ=0.15×(θ−θ)−4.55で表される。したがって、図9のグラフ中、斜線のハッチングで示した範囲は、下記式(1)〜(3)で表される。
1<ρ/ρ≦1.75 ……(1)
ρ/ρ≦0.15×(θ−θ)−4.55 ……(2)
θ−θ≦52 ……(3)
As shown in FIG. 9, the straight line connecting the point of Invention Example 2-3 and the point of Comparative Example 2-2 is ρ 1 / ρ 2 = 0.15 × (θ 1 −θ 2 ) −4.55. It is represented by Therefore, in the graph of FIG. 9, the range indicated by hatching is represented by the following formulas (1) to (3).
1 <ρ 1 / ρ 2 ≦ 1.75 (1)
ρ 1 / ρ 2 ≦ 0.15 × (θ 1 −θ 2 ) −4.55 (2)
θ 1 −θ 2 ≦ 52 (3)
また、本発明例3−1の点と比較例2−2の点とを結ぶ直線は、ρ/ρ=0.06×(θ−θ)−1.22で表され、本発明例4−3の点と本発明例3−4の点とを結ぶ直線は、ρ/ρ=0.012×(θ−θ)+0.136で表される。したがって、図9のグラフ中、格子状のハッチングで示した範囲は、下記式(4)〜(7)で表される。
ρ/ρ<1 ……(4)
ρ/ρ≦0.06×(θ−θ)−1.22……(5)
ρ/ρ≧0.012×(θ−θ)+0.136……(6)
θ−θ≦47 ……(7)
A straight line connecting the point of Invention Example 3-1 and the point of Comparative Example 2-2 is represented by ρ 1 / ρ 2 = 0.06 × (θ 1 −θ 2 ) −1.22. A straight line connecting the point of Invention Example 4-3 and the point of Invention Example 3-4 is represented by ρ 1 / ρ 2 = 0.012 × (θ 1 −θ 2 ) +0.136. Therefore, in the graph of FIG. 9, the range indicated by the lattice-like hatching is expressed by the following formulas (4) to (7).
ρ 1 / ρ 2 <1 (4)
ρ 1 / ρ 2 ≦ 0.06 × (θ 1 −θ 2 ) −1.22 (5)
ρ 1 / ρ 2 ≧ 0.012 × (θ 1 −θ 2 ) +0.136 (6)
θ 1 −θ 2 ≦ 47 (7)
曲率比ρ/ρと角度差(θ−θ)が、上記式(1)〜(3)を全て満たすように設定するか、または、上記式(4)〜(7)を全て満たすように設定することにより、しわの発生を抑制し、且つ加圧解除後の口開きを抑制できると考えられる。
また、本発明例2−3〜5は、天面部の変位量ΔHも小さいため、曲率比ρ/ρと角度差(θ−θ)を、上記式(1)〜(3)を全て満たすように設定することにより、天面部が加圧解除後に曲率が小さくなる方向に変形するのを抑制できると考えられる。
The curvature ratio ρ 1 / ρ 2 and the angle difference (θ 1 −θ 2 ) are set so as to satisfy all of the above formulas (1) to (3), or all the above formulas (4) to (7) are set. By setting so as to satisfy, it is considered that the generation of wrinkles can be suppressed and the opening of the mouth after releasing the pressure can be suppressed.
In addition, since Examples 2-3 to 5 of the present invention have a small amount of displacement ΔH of the top surface portion, the curvature ratio ρ 1 / ρ 2 and the angle difference (θ 1 −θ 2 ) are set to the above formulas (1) to (3). It is considered that by setting so as to satisfy all of the above, it is possible to suppress the top surface portion from being deformed in a direction in which the curvature decreases after the pressure is released.
1、101 成形部品
2、102 天面部
3、103 側面部
4、104 フランジ部
31、61 予備成形部品
32、62 天面部
33、63 側面部
34、64 フランジ部
κ、κ101 曲率(本発明の「所定の曲率」)
ρ11、ρ12 曲率(本発明の曲率ρ
ρ21、ρ22 曲率(本発明の曲率ρ
θ11、θ12 角度(本発明の角度θ
θ21、θ22 角度(本発明の角度θ
1,101 molded parts 2,102 top face portion 3, 103 side portion 4, 104 flanges 31 and 61 preformed parts 32 and 62 the top face portion 33,63 side portions 34, 64 flange portion kappa 1, kappa 101 curvature (present invention "Predetermined curvature")
ρ 11 , ρ 12 curvature (curvature ρ 1 of the present invention)
ρ 21 , ρ 22 curvature (curvature ρ 2 of the present invention)
θ 11 , θ 12 angles (angle θ 1 of the present invention)
θ 21 , θ 22 angles (the angle θ 2 of the present invention)

Claims (6)

  1. 長手方向に所定の曲率で湾曲した天面部と、前記天面部の長手方向に沿った両端から湾曲内側に向かって延在する2つの側面部とを有する成形部品をプレス成形するプレス成形方法であって、
    長手方向に前記所定の曲率と異なる曲率で湾曲する天面部と、前記天面部の長手方向に沿った両端から湾曲内側に向かって延在し且つ前記天面部となす角度が前記成形部品よりも大きい2つの側面部とを有する予備成形部品をプレス成形する予備成形工程と、
    前記予備成形部品の前記天面部をプレスして前記所定の曲率に近づく方向に変形させてから、その状態で、前記天面部と前記側面部とがなす角度が前記予備成形部品より小さくなるようにプレス成形する本成形工程とを有することを特徴とするプレス成形方法。
    A press molding method for press molding a molded part having a top surface curved with a predetermined curvature in the longitudinal direction and two side surfaces extending from both ends along the longitudinal direction of the top surface toward the inside of the curve. And
    A top surface portion that curves in a longitudinal direction with a curvature different from the predetermined curvature, and an angle that extends from both ends along the longitudinal direction of the top surface portion toward the inside of the curve and forms with the top surface portion is larger than that of the molded part. A preforming step of press molding a preformed part having two side portions;
    The top surface portion of the preformed part is pressed and deformed in a direction approaching the predetermined curvature, and in that state, an angle formed between the top surface portion and the side surface portion is made smaller than that of the preformed component. A press forming method comprising: a main forming step of press forming.
  2. 前記予備成形部品の前記天面部は、前記所定の曲率よりも大きい曲率で湾曲することを特徴とする請求項1に記載のプレス成形方法。   The press molding method according to claim 1, wherein the top surface portion of the preformed part is curved with a curvature larger than the predetermined curvature.
  3. 前記予備成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]とし、
    前記本成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]としたときに、
    下記式(1)〜(3)を満たすことを特徴とする請求項2に記載のプレス成形方法。
    1<ρ/ρ≦1.75 ……(1)
    ρ/ρ≦0.15×(θ−θ)−4.55 ……(2)
    θ−θ≦52 ……(3)
    The curvature of the top surface portion at the time of pressing in the preforming step is ρ 1 [1 / mm], the angle formed by the top surface portion and the side surface portion is θ 1 [°],
    When the curvature of the top surface portion at the time of pressing in the main forming step is ρ 2 [1 / mm], and the angle formed by the top surface portion and the side surface portion is θ 2 [°],
    The press molding method according to claim 2, wherein the following formulas (1) to (3) are satisfied.
    1 <ρ 1 / ρ 2 ≦ 1.75 (1)
    ρ 1 / ρ 2 ≦ 0.15 × (θ 1 −θ 2 ) −4.55 (2)
    θ 1 −θ 2 ≦ 52 (3)
  4. 前記予備成形部品の前記天面部は、前記所定の曲率よりも小さい曲率で湾曲することを特徴とする請求項1に記載のプレス成形方法。   The press molding method according to claim 1, wherein the top surface portion of the preformed part is curved with a curvature smaller than the predetermined curvature.
  5. 前記予備成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]とし、
    前記本成形工程のプレス時における前記天面部の曲率をρ[1/mm]、前記天面部と前記側面部とがなす角度をθ[°]としたときに、
    下記式(1)〜(4)を満たすことを特徴とする請求項4に記載のプレス成形方法。
    ρ/ρ<1 ……(1)
    ρ/ρ≦0.06×(θ−θ)−1.22……(2)
    ρ/ρ≧0.012×(θ−θ)+0.136……(3)
    θ−θ≦47 ……(4)
    The curvature of the top surface portion at the time of pressing in the preforming step is ρ 1 [1 / mm], the angle formed by the top surface portion and the side surface portion is θ 1 [°],
    When the curvature of the top surface portion at the time of pressing in the main forming step is ρ 2 [1 / mm], and the angle formed by the top surface portion and the side surface portion is θ 2 [°],
    The press molding method according to claim 4, wherein the following formulas (1) to (4) are satisfied.
    ρ 1 / ρ 2 <1 (1)
    ρ 1 / ρ 2 ≦ 0.06 × (θ 1 −θ 2 ) −1.22 (2)
    ρ 1 / ρ 2 ≧ 0.012 × (θ 1 −θ 2 ) +0.136 (3)
    θ 1 −θ 2 ≦ 47 (4)
  6. 前記成形部品は、前記側面部の先端部から延在するフランジ部を有し、
    前記予備成形工程において、フランジ部が形成されるように前記予備成形部品をプレス成形することを特徴とする請求項1〜5のいずれかに記載のプレス成形方法。
    The molded part has a flange portion extending from a tip portion of the side surface portion,
    6. The press molding method according to claim 1, wherein, in the preforming step, the preformed part is press-molded so that a flange portion is formed.
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