JPH05138258A - Method for press forming metal plate - Google Patents
Method for press forming metal plateInfo
- Publication number
- JPH05138258A JPH05138258A JP3301643A JP30164391A JPH05138258A JP H05138258 A JPH05138258 A JP H05138258A JP 3301643 A JP3301643 A JP 3301643A JP 30164391 A JP30164391 A JP 30164391A JP H05138258 A JPH05138258 A JP H05138258A
- Authority
- JP
- Japan
- Prior art keywords
- curved surface
- surface portion
- concave curved
- point
- press
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、プレス成形方法に関
し、特に、板材のプレス成形方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming method, and more particularly to a press forming method for a plate material.
【０００２】[0002]
【従来の技術】近年、プレス加工品の使用分野が拡大
し、特に、板材を複雑な曲面に高精度にプレス加工する
技術が要求されるようになってきた。そのために、板材
をプレス加工した場合のスプリングバック量を、事前に
精度良く予測計算できることが必要になって来ている。2. Description of the Related Art In recent years, the field of use of pressed products has expanded, and in particular, there has been a demand for a technique for pressing a plate material into a complicated curved surface with high precision. For this reason, it has become necessary to accurately predict and calculate the springback amount when the plate material is pressed.
【０００３】従来例の板材のプレス加工方法におけるス
プリングバック量の求め方を図３に基づいて説明する。A method of obtaining the springback amount in the conventional plate material pressing method will be described with reference to FIG.
【０００４】図３に示すように、従来例の板材のプレス
成形方法では、一定高さの外周を有し、且つ、滑らかな
曲面で構成される凹曲面部３と、前記外周の外側でこの
凹曲面部３に連続する平面部４とからなるプレス成形品
をプレス成形加工する場合には、プレス成形品の凹曲面
部３の各断面の曲線９について、不連続な複数の点のス
プリングバック量を個々に求め、これらの点の位置にス
プリングバック量を加えた位置を示す点群１０を滑らか
に繋いだ曲面に基づいて作成した金型を使用していた。As shown in FIG. 3, in the conventional press-forming method for a plate material, the concave curved surface portion 3 having a constant height and having a smooth curved surface, and the concave curved surface portion 3 on the outer side of the peripheral surface are formed. In the case of press-molding a press-formed product including the concave curved surface portion 3 and the flat surface portion 4 continuous with the concave curved surface portion 3, the spring back of a plurality of discontinuous points is set on the curve 9 of each cross section of the concave curved surface portion 3 of the press molded product. The amount was calculated individually, and a die made based on a curved surface in which point groups 10 indicating the positions obtained by adding the springback amount to the positions of these points were smoothly connected was used.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来例の方法
では、点群１０から凹曲面部３を形成する場合、凹曲面
を滑らかに作成できるとは限らず、スプリングバック量
の予測精度が悪くなり、金型曲面を機械加工する場合
に、機械制御に滑らかさを欠く場合があり、金型の凹曲
面部３に不連続な部分が生じる等の問題点がある。そし
て、この金型を使用して板材のプレス加工を行うと、プ
レス成形品の曲面に不連続な部分が発生し、スプリング
バック量が不適切なことと、スプリングバック量が凹曲
面全体に滑らかに作用しないことによって、プレス加工
品の寸法精度が悪くなるという問題点がある。However, in the method of the conventional example, when the concave curved surface portion 3 is formed from the point group 10, the concave curved surface cannot be created smoothly, and the prediction accuracy of the springback amount is poor. However, when machining the curved surface of the mold, the machine control may lack smoothness, and there is a problem that a discontinuous portion is generated in the concave curved surface part 3 of the mold. When pressing a plate material using this mold, a discontinuous portion occurs on the curved surface of the press-formed product, the springback amount is inappropriate, and the springback amount is smooth over the entire concave curved surface. However, there is a problem in that the dimensional accuracy of the pressed product deteriorates due to the fact that it does not work.
【０００６】本発明は、一定高さの外周を有し、且つ、
滑らかな曲面で構成される凹曲面部と前記外周の外側で
この凹曲面部に連続する平面部とからなるプレス成形品
のプレス成形加工方法において、上記の問題点を解決し
て、金型の精度が良く適正なスプリングバック量が凹曲
面全体に滑らかに作用するようにした板材のプレス成形
方法を提供することを課題としている。The present invention has a constant height perimeter, and
In a press-molding method for a press-molded product, which comprises a concave curved surface portion formed of a smooth curved surface and a flat surface portion outside the outer periphery and continuous with the concave curved surface portion, the above-mentioned problems are solved, An object of the present invention is to provide a method for press-forming a plate material, which is highly accurate and allows an appropriate springback amount to smoothly act on the entire concave curved surface.
【０００７】[0007]
【課題を解決するための手段】本発明の板材のプレス成
形方法は、上記の課題を解決するために、一定高さの外
周を有し、且つ、滑らかな曲面で構成される凹曲面部
と、前記外周の外側でこの凹曲面部に連続する平面部と
からなるプレス成形品のプレス成形加工方法において、
凹曲面部最深点Ｂを通り前記平面部に垂直な直線を含む
平面による凹曲面部の各断面における凹曲面部の曲線
を、夫々ｎ次曲線として表し、凹曲面部最深点Ｂのスプ
リングバック量Ｓ0 を通常の解析方法で求め、このスプ
リングバック量Ｓ0 と凹曲面部上の任意の点Ｐのスプリ
ングバック量ＺS との比が、凹曲面部最深点Ｂから前記
任意の点Ｐまでの前記平面部に平行方向の距離ｒと凹曲
面部最深点Ｂから前記任意の点Ｐを通って前記外周まで
の前記平面部に平行方向の距離Ｒとの比のｎ乗に比例す
るとして、前記スプリングバック量ＺS を、ＺS ＝｛１
−（ｒ／Ｒ）｝n ×Ｓ0 として求め、これによって、凹
曲面部最深点Ｂを通り前記平面部に垂直な直線を含む平
面による凹曲面部の各断面における凹曲面部の曲線上の
スプリングバック量ＺS を連続的に計算し、この計算に
基づいた凹曲面部を有する金型を使用することを特徴と
する。[Means for Solving the Problems] In order to solve the above-mentioned problems, a method of press-forming a plate material according to the present invention has a concave curved surface portion which has an outer periphery of a constant height and is composed of a smooth curved surface. In the press-molding method of the press-molded product consisting of a flat surface portion that is continuous with the concave curved surface portion outside the outer periphery,
A curve of the concave curved surface portion in each cross section of the concave curved surface portion formed by a plane including a straight line passing through the deepest point B of the concave curved surface portion and being perpendicular to the flat surface portion is expressed as an n-th order curve, and the springback amount of the deepest point B of the concave curved surface portion is represented. S 0 is obtained by an ordinary analysis method, and the ratio of the springback amount S 0 and the springback amount Z S of an arbitrary point P on the concave curved surface portion is from the deepest point B of the concave curved surface portion to the arbitrary point P. Is proportional to the n-th power of the ratio of the distance r in the parallel direction to the flat surface portion and the distance R in the parallel direction to the flat surface portion from the deepest point B of the concave curved surface portion to the outer periphery through the arbitrary point P, The spring back amount Z S is calculated as Z S = {1
-(R / R)} n × S 0 , and thereby, on the curved surface of the concave curved surface portion in each cross section of the concave curved surface portion by a plane including a straight line passing through the deepest point B of the concave curved surface portion and perpendicular to the flat surface portion. The feature is that the spring back amount Z S is continuously calculated and a mold having a concave curved surface portion based on this calculation is used.
【０００８】又、本発明の板材のプレス成形方法は、上
記の課題を解決するために、ｎ次曲線が高次多項式であ
り、｛１−（ｒ／Ｒ）｝n が｛１−（ｒ／Ｒ）｝の高次
多項式であることが好適である。In order to solve the above-mentioned problems, the plate material press-molding method of the present invention is such that the nth-order curve is a high-order polynomial, and {1- (r / R)} n is {1- (r. / R)} is preferably a higher order polynomial.
【０００９】[0009]
【作用】本発明の板材のプレス成形方法は、凹曲面部上
の任意の点のスプリングバック量ＺS をＺS ＝（１−ｒ
／Ｒ）n ×Ｓ0 によって連続的に求めることによって、
金型の精度が良くなり、適正なスプリングバック量がプ
レス成形品の凹曲面全体に滑らかに作用するようにな
り、プレス成形品の寸法精度が向上する。According to the plate material press-forming method of the present invention, the spring back amount Z S at an arbitrary point on the concave curved surface portion is Z S = (1-r
/ R) n × S 0
The precision of the die is improved, and an appropriate amount of springback is smoothly applied to the entire concave curved surface of the press-formed product, which improves the dimensional accuracy of the press-formed product.
【００１０】又、本発明の板材のプレス成形方法は、ｎ
次曲線が高次多項式であり、（１−ｒ／Ｒ）n が（１−
ｒ／Ｒ）の高次多項式である場合には、曲面構成であれ
ば、どのような複雑な凹曲面のプレス成形でも、金型の
精度が良くなり、適正なスプリングバック量がプレス成
形品の凹曲面全体に滑らかに作用するようになり、プレ
ス成形品の寸法精度が向上する。Further, according to the method for press-forming a plate material of the present invention, n
The quadratic curve is a high-order polynomial, and (1-r / R) n is (1-
r / R) is a high-order polynomial, and with a curved surface configuration, the precision of the mold is improved and the proper springback amount is obtained in the press-formed product even if the press-forming of any complicated concave curved surface is performed. It works smoothly on the entire concave curved surface, improving the dimensional accuracy of the press-formed product.
【００１１】[0011]
【実施例】本発明の板材のプレス成形方法の一実施例を
図１、図２に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the plate material press-molding method of the present invention will be described with reference to FIGS.
【００１２】図１に示す板材のプレス成形品２は、一定
高さの外周を有し、且つ、滑らかな曲面で構成される凹
曲面部３と、凹曲面部３の外周の外側でこの凹曲面部３
に連続する平面部４と、平面部４の外周で平面部４に連
続する側面フランジ部５とを有する。The press-formed product 2 of the plate material shown in FIG. 1 has a concave curved surface portion 3 which has a constant height outer periphery and is formed by a smooth curved surface, and the concave surface portion 3 on the outer periphery of the concave curved surface portion 3. Curved surface 3
And a side surface flange portion 5 continuous with the flat surface portion 4 at the outer periphery of the flat surface portion 4.
【００１３】図１に示すように、成形品２の凹曲面部３
の曲面中心を原点にとり、平面部４に垂直方向をＺ軸、
凹曲面部３の長軸方向をＸ軸、短軸方向をＹ軸として、
ＸＹＺ座標を設定する。As shown in FIG. 1, the concave curved surface portion 3 of the molded product 2 is formed.
The center of the curved surface of is the origin, the direction perpendicular to the plane part 4 is the Z axis,
With the major axis direction of the concave curved surface portion 3 as the X axis and the minor axis direction as the Y axis,
Set the XYZ coordinates.
【００１４】図２は、凹曲面部３の凹曲面部最深点Ｂを
通りＺ軸に平行な直線を含む平面による成形品２と金型
面の断面を示す。凹曲面部３の断面を曲線６、曲線６に
スプリングバック量を加えた金型面の断面を曲線７と
し、凹曲面部３の凹曲面部最深点Ｂから平面部４までの
Ｚ軸方向の距離をＺ0 、この凹曲面部最深点Ｂのスプリ
ングバック量をＳ0 とし、凹曲面部３の凹曲面部最深点
Ｂから成形品２の凹曲面部３上の任意の点Ｐ（ｘ、ｙ）
までのＺ軸に垂直方向の距離をｒ、この点Ｐ（ｘ、ｙ）
から平面部４までのＺ軸方向の距離をＺ（ｘ、ｙ）、こ
の点Ｐ（ｘ、ｙ）のスプリングバック量をＺS とし、凹
曲面部３の凹曲面部最深点Ｂから前記任意の点Ｐを通っ
て凹曲面部３の最外周部までのＺ軸に垂直方向の距離を
Ｒとした場合、曲線６をｎ次曲線として表すと、次の式
（１）となる。FIG. 2 shows a cross section of the molded product 2 and the die surface by a plane including a straight line passing through the deepest point B of the concave curved surface portion 3 and parallel to the Z axis. The cross section of the concave curved surface portion 3 is a curve 6, the cross section of the mold surface obtained by adding the spring back amount to the curve 6 is a curved surface 7, and the cross section of the concave curved surface portion 3 from the deepest point B to the flat surface portion 4 in the Z-axis direction is shown. Let Z 0 be the distance, S 0 be the springback amount at the deepest point B of the concave curved surface portion, and S 0 be the arbitrary point P (x, on the concave curved surface portion 3 of the molded product 2 from the deepest point B of the concave curved surface portion 3 of the concave curved surface portion 3. y)
The distance in the direction perpendicular to the Z-axis up to r, at this point P (x, y)
Let Z (x, y) be the distance from the flat surface portion 4 to the flat surface portion 4 and Z S be the amount of spring back at this point P (x, y). When the distance in the direction perpendicular to the Z axis to the outermost peripheral portion of the concave curved surface portion 3 through the point P is R, the curve 6 is expressed as an nth-order curve, the following equation (1) is obtained.
【００１５】 Ｚ（ｘ、ｙ）＝Ｚ0 ×｛１−（ｒ／Ｒ）｝n ・・・・・・・・・・・（１） 又、図２において、凹曲面部３の断面を示す曲線６上の
任意の点Ｐのスプリングバック量ＺS は、平面部４に接
する曲線６の最外周部ではスプリングバック量が０であ
るので、図２から明らかなように、比例計算によって、
次の式（２）になる。Z (x, y) = Z 0 × {1- (r / R)} n ... (1) Further, in FIG. As for the springback amount Z S of the arbitrary point P on the curve 6 shown, the springback amount is 0 at the outermost peripheral portion of the curve 6 in contact with the plane portion 4, so that it is clear from FIG.
It becomes the following formula (2).
【００１６】 ＺS ＝｛（Ｚ0 ＋Ｓ0 ）／Ｚ0 ｝×Ｚ（ｘ、ｙ）−Ｚ（ｘ、ｙ） ＝（Ｓ0 ／Ｚ0 ）×Ｚ（ｘ、ｙ）・・・・・・・・・・・・・・（２） 式（１）を式（２）に代入することにより、成形品２の
凹曲面部３上の任意の点Ｐ（ｘ、ｙ）におけるスプリン
グバック量ＺS は、次の式（３）となる。Z S = {(Z 0 + S 0 ) / Z 0 } × Z (x, y) −Z (x, y) = (S 0 / Z 0 ) × Z (x, y) ... (2) By substituting the equation (1) into the equation (2), the spring back at an arbitrary point P (x, y) on the concave curved surface portion 3 of the molded product 2 is obtained. The quantity Z S is given by the following equation (3).
【００１７】 ＺS ＝｛１−（ｒ／Ｒ）｝n ×Ｓ0 ・・・・・・・・・・・・・・・（３） 本実施例方法を使用して、板厚１ｍｍ、Ｘ軸方向の長さ
４２５ｍｍ、Ｙ軸方向の長さ３５８ｍｍ、凹曲面部３の
最深部の深さ４０．９ｍｍの凹曲面を有する成形品をプ
レス成形した場合、解析的に求めたＳ0 ＝０．８ｍｍ、
次数ｎ＝１から４（各断面ごとに異なる）の設定で、滑
らかな曲面の成形品が得られ、凹曲面中央部での曲面形
状精度が±０．１ｍｍの公差内に充分に収まっており、
製品の特性も所望の値を達成できた。Z S = {1− (r / R)} n × S 0 (3) Using the method of this example, a plate thickness of 1 mm, When a molded product having a concave curved surface having a length of 425 mm in the X-axis direction, a length of 358 mm in the Y-axis direction, and a depth of 40.9 mm at the deepest portion of the concave curved surface part 3 was press-molded, S 0 = analyzed. 0.8 mm,
By setting the order n = 1 to 4 (different for each cross section), a molded product with a smooth curved surface can be obtained, and the curved surface shape accuracy at the center of the concave curved surface is well within the tolerance of ± 0.1 mm. ,
The product characteristics could also achieve the desired values.
【００１８】本発明の板材のプレス成形方法は、上記の
実施例方法に限らず種々の態様が可能である。例えば、
凹曲面を構成する曲線の式は高次多項式であっても良
く、この場合は、｛１−（ｒ／Ｒ）｝n が｛１−（ｒ／
Ｒ）｝の高次多項式になる。The plate material press-molding method of the present invention is not limited to the above-described embodiment method, and various modes are possible. For example,
The equation of the curve forming the concave surface may be a high-order polynomial, and in this case, {1- (r / R)} n is {1- (r /
R)} becomes a high-order polynomial.
【００１９】又、ＸＹＺ座標の原点は実施例の位置に限
らない。The origin of the XYZ coordinates is not limited to the position of the embodiment.
【００２０】[0020]
【発明の効果】本発明の板材のプレス成形方法は、一定
高さの外周を有し、且つ、滑らかな曲面で構成される凹
曲面部と前記外周の外側でこの凹曲面部に連続する平面
部とからなるプレス成形品のプレス成形加工方法におい
て、凹曲面部上の任意の点のスプリングバック量ＺS を
ＺS ＝｛１−（ｒ／Ｒ）｝n ×Ｓ0 によって求めること
によって、金型の精度が良くなり、適正なスプリングバ
ック量がプレス成形品の凹曲面全体に滑らかに作用する
ようなり、プレス成形品の寸法精度が向上するという効
果を奏する。According to the method for press-forming a plate material of the present invention, a concave curved surface portion having a constant height and having a smooth curved surface, and a flat surface continuous to the concave curved surface portion outside the peripheral surface are provided. In a method of press-forming a press-formed product including a portion, by obtaining a springback amount Z S at an arbitrary point on the concave curved surface portion by Z S = {1- (r / R)} n × S 0 , As a result, the precision of the die is improved, and an appropriate amount of springback acts smoothly on the entire concave curved surface of the press-formed product, which improves the dimensional accuracy of the press-formed product.
【００２１】又、本発明の板材のプレス成形方法は、ｎ
次曲線が高次多項式であり、｛１−（ｒ／Ｒ）｝n が
｛１−（ｒ／Ｒ）｝の高次多項式である場合には、曲面
構成であれば、どのような凹曲面のプレス成形でも、金
型の精度が良くなり、適正なスプリングバック量がプレ
ス成形品の凹曲面全体に滑らかに作用するようなり、プ
レス成形品の寸法精度が向上するという効果を奏する。Further, the press forming method of the plate material of the present invention is
If the quadratic curve is a high-order polynomial and {1- (r / R)} n is a high-order polynomial of {1- (r / R)} Also in the press molding, the precision of the mold is improved, and an appropriate springback amount acts smoothly on the entire concave curved surface of the press molded product, and the dimensional accuracy of the press molded product is improved.
【図１】本発明の一実施例方法を使用して成形したプレ
ス成形品の斜視図である。FIG. 1 is a perspective view of a press-formed product formed by using a method according to an embodiment of the present invention.
【図２】本発明の一実施例方法の原理図である。FIG. 2 is a principle diagram of an embodiment method of the present invention.
【図３】従来例の原理図である。FIG. 3 is a principle diagram of a conventional example.
２ プレス成形品 ３ 凹曲面部 ４ 平面部 ６ 成形品の断面 ７ 金型の断面 Ｂ 凹曲面部最深点 Ｐ 成形品上の任意の点 2 Press-molded product 3 Concave curved surface part 4 Flat surface part 6 Cross-section of molded product 7 Cross-section of mold B Concave curved surface part deepest point P Any point on molded product
Claims (2)
曲面で構成される凹曲面部と、前記外周の外側でこの凹
曲面部に連続する平面部とからなるプレス成形品のプレ
ス成形加工方法において、凹曲面部最深点Ｂを通り前記
平面部に垂直な直線を含む平面による凹曲面部の各断面
における凹曲面部の曲線を、夫々ｎ次曲線として表し、
凹曲面部最深点Ｂのスプリングバック量Ｓ0 を通常の解
析方法で求め、このスプリングバック量Ｓ0 と凹曲面部
上の任意の点Ｐのスプリングバック量ＺS との比が、凹
曲面部最深点Ｂから前記任意の点Ｐまでの前記平面部に
平行方向の距離ｒと凹曲面部最深点Ｂから前記任意の点
Ｐを通って前記外周までの前記平面部に平行方向の距離
Ｒとの比のｎ乗に比例するとして、前記スプリングバッ
ク量ＺS を、ＺS ＝｛１−（ｒ／Ｒ）｝n ×Ｓ0 として
求め、これによって、凹曲面部最深点Ｂを通り前記平面
部に垂直な直線を含む平面による凹曲面部の各断面にお
ける凹曲面部の曲線上のスプリングバック量ＺS を連続
的に計算し、この計算に基づいた凹曲面部を有する金型
を使用することを特徴とする板材のプレス成形方法。1. A press-molded product press comprising a concave curved surface portion having a constant height of the outer periphery and formed of a smooth curved surface, and a flat surface portion outside the outer periphery and continuous with the concave curved surface portion. In the molding method, a curve of the concave curved surface portion in each cross section of the concave curved surface portion by a plane including a straight line that passes through the deepest point B of the concave curved surface portion and is perpendicular to the flat surface portion is represented as an nth-order curve,
The spring back amount S 0 at the deepest point B of the concave curved surface portion is obtained by a usual analysis method, and the ratio of this spring back amount S 0 and the spring back amount Z S of an arbitrary point P on the concave curved surface portion is A distance r in the direction parallel to the plane portion from the deepest point B to the arbitrary point P, and a distance R in the direction parallel to the plane portion from the deepest point B of the concave curved surface portion to the outer circumference through the arbitrary point P. Is proportional to the n-th power of the ratio, the springback amount Z S is obtained as Z S = {1- (r / R)} n × S 0 , whereby the plane passing through the concave curved surface deepest point B The amount of spring back Z S on the curved surface of the concave curved surface portion in each cross section of the concave curved surface portion with a plane including a straight line perpendicular to the portion is continuously calculated, and a mold having the concave curved surface portion based on this calculation is used. A press forming method for a plate material, comprising:
（ｒ／Ｒ）｝n が｛１−（ｒ／Ｒ）｝の高次多項式であ
る請求項１に記載の板材のプレス成形方法。2. The n-th order curve is a high-order polynomial, {1-
The press forming method for a plate material according to claim 1, wherein (r / R)} n is a high-order polynomial of {1- (r / R)}.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3301643A JP3071527B2 (en) | 1991-11-18 | 1991-11-18 | Press forming method of sheet material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3301643A JP3071527B2 (en) | 1991-11-18 | 1991-11-18 | Press forming method of sheet material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05138258A true JPH05138258A (en) | 1993-06-01 |
| JP3071527B2 JP3071527B2 (en) | 2000-07-31 |
Family
ID=17899411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3301643A Expired - Fee Related JP3071527B2 (en) | 1991-11-18 | 1991-11-18 | Press forming method of sheet material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3071527B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1043027A (en) * | 1996-07-31 | 1998-02-17 | Toyo Alumifoil Prod Kk | Paper container and forming method thereof |
-
1991
- 1991-11-18 JP JP3301643A patent/JP3071527B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1043027A (en) * | 1996-07-31 | 1998-02-17 | Toyo Alumifoil Prod Kk | Paper container and forming method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3071527B2 (en) | 2000-07-31 |
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