WO2012133867A1 - プレス成形解析方法 - Google Patents
プレス成形解析方法 Download PDFInfo
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- WO2012133867A1 WO2012133867A1 PCT/JP2012/058774 JP2012058774W WO2012133867A1 WO 2012133867 A1 WO2012133867 A1 WO 2012133867A1 JP 2012058774 W JP2012058774 W JP 2012058774W WO 2012133867 A1 WO2012133867 A1 WO 2012133867A1
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- press
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/82—Elements for improving aerodynamics
Definitions
- the present invention relates to a press molding analysis method, and more particularly, to a method for accurately analyzing in a short time how and in which region of a press molded product the stress affects the springback.
- a high-strength steel sheet has a large elastic recovery after press forming (hereinafter referred to as springback, and may be abbreviated as SB), and therefore it is difficult to ensure the dimensional accuracy of parts. For this reason, it is necessary to repeatedly adjust the shape of the press mold and adjust the mold several times until the normal dimensional accuracy is achieved.
- step (1) Analysis of deformation, stress and strain of material under restraint by press mold
- step (2) Analysis of springback in a state released from restraint by press mold
- step (1) is finite
- step (2) Analysis of springback in a state released from restraint by press mold
- step (1) is finite
- step (2) the analysis is performed by the springback theoretical formula or the finite element method.
- Patent Documents 1 and 2 have studied the influence of the shape of a molding object and the molding conditions on the springback.
- Patent Document 1 calculates how a defined amount of springback before and after changing the residual stress distribution changes by changing the residual stress distribution in a certain area of the press molding object, A method for predicting the impact on a region of springback is disclosed.
- the present invention has been made to solve the above-described problems, and the stress change before release is performed in consideration of the stress (residual stress) distribution after the press-molded product is released from the press die.
- the stress change before release is performed in consideration of the stress (residual stress) distribution after the press-molded product is released from the press die.
- the gist of the present invention is as follows.
- the shape of the press-formed product before release and the data of the residual stress distribution are calculated, and the stress in the local coordinate system before release by coordinate transformation based on the data before release.
- a springback analysis is performed based on the data before release, the residual stress distribution of the press-formed product after release is calculated, and the residual stress distribution (b) of the press-formed product in the local coordinate system by coordinate transformation )
- shape data (d) of the press-formed product after mold release (3)
- the difference (ab) between the stress distributions (a) and (b) is calculated, and the difference is used as a spring bag effective stress (SB effective stress).
- a press forming analysis method characterized by comprising:
- the shape of the press-molded product before release and the data of residual stress distribution are calculated, and the stress in the local coordinate system before release by coordinate transformation based on the data before release.
- a springback analysis is performed based on the data before release, the residual stress distribution of the press-formed product after release is calculated, and the residual stress distribution (b) of the press-formed product in the local coordinate system by coordinate transformation )
- shape data (d) of the press-formed product after mold release (3)
- the difference (ab) between the stress distributions (a) and (b) is calculated, and the difference is used as a spring bag effective stress (SB effective stress).
- FIG. 4 is a flowchart showing the processing sequence of the press forming analysis method according to the first embodiment of the press forming analyzing method according to the present invention.
- the springback analysis is performed after changing or removing the springback effective stress in the springback analysis target region, and the press-molded product after the mold release is performed. This is an analysis method for evaluating the influence of stress in the springback analysis target region by comparing the shapes.
- the analysis calculation in the press forming analysis method shown in FIG. 4 is performed using a finite element method (FEM) analysis system.
- FEM finite element method
- step S1 First, in step S1, the stress distribution of the press-formed product before release is obtained.
- step S2 the stress expressed in the global coordinate system obtained in step S1 is defined as a local coordinate system that does not change before and after mold release, and the stress is coordinate-transformed to obtain a stress distribution in the local coordinate system ( a) is determined. Since press-molded products are rotated by springback after mold release, if the stress expressed in the global coordinate system is directly differentiated, the stress contributing to the deformation cannot be obtained accurately. Therefore, for each finite element that gives a stress distribution, a local coordinate system that does not change before and after mold release, which is a method generally used in finite element analysis, is defined, and the stress difference is calculated before and after mold release after coordinate transformation of stress. Do it.
- the coordinate transformation of the stress is performed by converting the three orthogonal unit vectors of the local coordinate system to (l 1 , m 1 , n 1 ), (l 2 , m 2 , n 2 ), (l 3 , m 3 , n 3 ) Then, it is given by equation (1).
- the local coordinate system used in the press forming simulation generally uses four or three shell elements with no nodes in the thickness direction. Therefore, it is common to select a plate thickness direction, that is, a surface normal direction formed by four or three nodes as one third axis of the coordinate system.
- a plate thickness direction that is, a surface normal direction formed by four or three nodes as one third axis of the coordinate system.
- the four points are not necessarily on the same plane, so (1) the direction obtained from the outer product of the diagonal lines is the plate thickness direction, and (2) the surface normal direction of the approximate plane is the plate There are methods such as the thickness direction.
- the first axis and the second axis include (1) a method in which the direction from the first node to the second node of the shell element is the first axis, and (2) a method in which the first axis and the second axis are made from a diagonal vector.
- S6 The shape data (d) of the press-molded product after mold release is obtained from the springback analysis of S3.
- SB effective stress The difference (ab) between the stress distribution (a) before mold release and the residual stress distribution (b) after mold release is called springback effective stress (hereinafter referred to as SB effective stress), and the distribution is obtained. .
- step S11 A springback analysis is performed from the stress distribution obtained in step S10.
- FIG. 5 is a flowchart showing the processing sequence of the press forming analysis method according to the second embodiment of the press forming analyzing method according to the present invention.
- the stress distribution obtained by adding the residual stress of the local coordinate system to the spring bag effective stress distribution of the local coordinate system obtained by partially changing or removing the springback effective stress obtained in the first embodiment is an analysis method for evaluating the influence of the stress in the region subject to springback analysis by performing a springback analysis after converting to a global coordinate system and comparing it with the shape of the press-formed product after mold release.
- FEM finite element method
- step S21 First, in step S21, the stress distribution of the press-formed product before mold release is obtained.
- step S22 the local coordinate system that does not change before and after the mold release is defined for the stress expressed in the global coordinate system obtained in step S21, and the stress is coordinate-transformed to obtain a stress distribution ( a) is determined. Since the method for obtaining the local coordinate system is the same as that in the first embodiment, it is omitted in this section.
- SB effective stress The difference (ab) between the stress distribution (a) before mold release and the residual stress distribution (b) after mold release is called springback effective stress (hereinafter referred to as SB effective stress), and the distribution is obtained. .
- S28 The coordinate transformation from the local coordinate system to the global coordinate system is performed to obtain the SB effective stress distribution in the global coordinate system.
- press molding of a front pillar inner part will be described.
- Figure 1 shows the general shape of this part. Using a 980 MPa class high-tensile cold-rolled steel sheet having a thickness of 1.6 mm, press molding and trim processing were performed by a mold, and the front pillar inner part was finished through bend processing. Bending is performed along the bend line shown in FIG.
- the press forming analysis analyzed how much the stresses in the analysis target areas 1 to 6 shown in FIG. 2 are affected when the front pillar inner part shown in FIG. 1 is formed.
- the analysis was performed along the steps shown in FIGS. 4 and 5 using a commercially available finite element method (FEM) analysis system. Specifically, after bending, the stress in each region (1 to 6) shown in FIG. 2 was removed, and the influence on the Z-direction displacement at points A and B was investigated. In addition, the displacement in the Z direction of the point A after the usual springback analysis (the stress is not removed in each region) is ⁇ 16.5 mm, and the point B is ⁇ 9.7 mm. In the conventional example (Patent Document 1), the springback calculation is performed by removing all the stresses regarding the analysis target region (any one of 1 to 6). Invention Example 1 takes out only the SB effective stress of the present invention (S8 in FIG.
- FEM finite element method
- Inventive example 2 is obtained by removing only the SB effective stress in the analysis target region (any one of 1 to 6) (S29 in FIG. 5) and performing a springback calculation (S35 in FIG. 5).
- the horizontal axis represents the number of the analysis target area
- the vertical axis represents the displacement (mm) in the Z direction of the point A.
- the influence of the analysis target area 6 is the largest, but in the first and second invention examples, the influence of the analysis target area 2 is the largest.
- the influence of the analysis target area 6 is increased because the analysis target area 6 has a relatively complicated shape and a large residual stress after the spring bag, and therefore, the influence is eliminated. . Further, in the bend process, the analysis target region 4 to the analysis target region 6 are far from the bend line to which plastic deformation is applied. Therefore, it is considered that the influence of the analysis target region 6 is excessively evaluated in the conventional example.
- 1 to 6 are codes representing the analysis target area.
Abstract
Description
(1)プレス金型による拘束の下での、材料の変形、応力、歪の解析
(2)プレス金型による拘束から開放された状態でのスプリングバックの解析
ここで、段階(1)は有限要素法により解析され、段階(2)はスプリングバック理論式あるいは有限要素法による解析が行われている。
(2)前記離型前のデータに基づいてスプリングバック解析を行い、離型後のプレス成形品の残留応力分布を算出し、座標変換により局所座標系でのプレス成形品の残留応力分布(b)を算出するとともに、離型後のプレス成形品の形状データ(d)を算出する工程、
(3)前記応力分布(a)と(b)との差分(a−b)を算出し、該差分をスプリングバッグ有効応力(SB有効応力)として座標変換により全体座標系におけるSB有効応力分布を算出し、このSB有効応力分布のうち解析対象領域のSB有効応力を変更または除去して、プレス成形品のSB有効応力分布を算出し、スプリングバック解析を行い、離型後のプレス成形品の形状データ(c)を算出する工程、
(4)前記形状データ(c)と形状データ(d)との差分(c−d)を算出し、解析対象領域の全体形状に対する影響度合を判定する工程、
とからなることを特徴とするプレス成形解析方法である。
(2)前記離型前のデータに基づいてスプリングバック解析を行い、離型後のプレス成形品の残留応力分布を算出し、座標変換により局所座標系でのプレス成形品の残留応力分布(b)を算出するとともに、離型後のプレス成形品の形状データ(d)を算出する工程、
(3)前記応力分布(a)と(b)との差分(a−b)を算出し、該差分をスプリングバッグ有効応力(SB有効応力)として座標変換により全体座標系におけるSB有効応力分布を算出し、このSB有効応力分布のうち解析対象領域のSB有効応力を除去して、プレス成形品のSB有効応力分布(X)を算出する工程、
(4)前記局所座標系での残留応力分布(b)を離型前のプレス成形品の形状に付与して局所座標系での残留応力相当分を算出し、座標変換により全体座標系でのプレス成形品の残留応力相当分(Y)を算出する工程、
(5)前記プレス成形品のSB有効応力分布(X)に前記プレス成形品の残留応力相当分(Y)を加算した応力分布を算出してスプリングバック解析を行い、離型後のプレス成形品の形状データ(c)を算出する工程、
(6)前記形状データ(c)と形状データ(d)との差分(c−d)を算出し、解析対象領域の全体形状に対する影響度合を判定する工程、
とからなることを特徴とするプレス成形解析方法である。
本発明の第1の実施の形態を図面を参照して説明する。
第1の実施の形態は、スプリングバック有効応力にのみ着目して、スプリングバック解析対象領域のスプリングバック有効応力を変更または除去を行った後にスプリングバック解析を行い、離型後のプレス成形品の形状を比較することで、スプリングバック解析対象領域の応力の影響を評価する解析方法である。
S1:先ず、ステップS1において離型前のプレス成形品の応力分布を求める。
S3:ステップS1の応力分布に基づきスプリングバック解析を行う。
S7:離型前の応力分布(a)と離型後の残留応力分布(b)との差分(a−b)をスプリングバック有効応力(以下SB有効応力と呼ぶ)と呼び、その分布を求める。
S13:形状データ(c)と形状データ(d)との差分(c−d)を算出し、SB解析対象領域の全体形状への影響度を評価する。
本発明の第2の実施の形態を図面を参照して説明する。
S21:先ず、ステップS21において離型前のプレス成形品の応力分布を求める。
S23:ステップS21の応力分布に基づきスプリングバック解析を行う。
S27:離型前の応力分布(a)と離型後の残留応力分布(b)との差分(a−b)をスプリングバック有効応力(以下SB有効応力と呼ぶ)と呼び、その分布を求める。
S31:離型前のプレス成形品の形状に応力(b)を付与する。
S34:SB有効応力分布(X)に残留応力相当分(Y)を加算した応力分布を求める。
S37:形状データ(c)と形状データ(d)との差分(c−d)を算出し、SB解析対象領域の全体形状への影響度を評価する。
Claims (2)
- (1)離型前のプレス成形品の形状、残留応力分布のデータを算出し、前記離型前のデータに基づいて座標変換により離型前の局所座標系での応力分布(a)を算出する工程、
(2)前記離型前のデータに基づいてスプリングバック解析を行い、離型後のプレス成形品の残留応力分布を算出し、座標変換により局所座標系でのプレス成形品の残留応力分布(b)を算出するとともに、離型後のプレス成形品の形状データ(d)を算出する工程、
(3)前記応力分布(a)と(b)との差分(a−b)を算出し、該差分をスプリングバッグ有効応力(SB有効応力)として座標変換により全体座標系におけるSB有効応力分布を算出し、このSB有効応力分布のうち解析対象領域のSB有効応力を変更または除去して、プレス成形品のSB有効応力分布を算出し、スプリングバック解析を行い、離型後のプレス成形品の形状データ(c)を算出する工程、
(4)前記形状データ(c)と形状データ(d)との差分(c−d)を算出し、解析対象領域の全体形状に対する影響度合を判定する工程、
とからなることを特徴とするプレス成形解析方法。 - (1)離型前のプレス成形品の形状、残留応力分布のデータを算出し、前記離型前のデータに基づいて座標変換により離型前の局所座標系での応力分布(a)を算出する工程、
(2)前記離型前のデータに基づいてスプリングバック解析を行い、離型後のプレス成形品の残留応力分布を算出し、座標変換により局所座標系でのプレス成形品の残留応力分布(b)を算出するとともに、離型後のプレス成形品の形状データ(d)を算出する工程、
(3)前記応力分布(a)と(b)との差分(a−b)を算出し、該差分をスプリングバッグ有効応力(SB有効応力)として座標変換により全体座標系におけるSB有効応力分布を算出し、このSB有効応力分布のうち解析対象領域のSB有効応力を除去して、プレス成形品のSB有効応力分布(X)を算出する工程、
(4)前記局所座標系での残留応力分布(b)を離型前のプレス成形品の形状に付与して局所座標系での残留応力相当分を算出し、座標変換により全体座標系でのプレス成形品の残留応力相当分(Y)を算出する工程、
(5)前記プレス成形品のSB有効応力分布(X)に前記プレス成形品の残留応力相当分(Y)を加算した応力分布を算出してスプリングバック解析を行い、離型後のプレス成形品の形状データ(c)を算出する工程、
(6)前記形状データ(c)と形状データ(d)との差分(c−d)を算出し、解析対象領域の全体形状に対する影響度合を判定する工程、
とからなることを特徴とするプレス成形解析方法。
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EP12763272.7A EP2692454B1 (en) | 2011-03-30 | 2012-03-26 | Press forming analysis method |
MX2013011153A MX2013011153A (es) | 2011-03-30 | 2012-03-26 | Metodo para el analisis de conformacion por presion. |
KR1020137026029A KR101544464B1 (ko) | 2011-03-30 | 2012-03-26 | 프레스 성형 해석 방법 |
US14/007,974 US9410855B2 (en) | 2011-03-30 | 2012-03-26 | Method for press forming analysis |
CN201280016493.7A CN103459058B (zh) | 2011-03-30 | 2012-03-26 | 冲压成形分析方法 |
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JP2007229724A (ja) | 2006-02-27 | 2007-09-13 | Jfe Steel Kk | プレス成形解析方法 |
JP2008049389A (ja) * | 2006-08-28 | 2008-03-06 | Toyota Motor Corp | 形状不良要因特定方法、装置及びプログラム |
WO2008026777A1 (fr) * | 2006-08-31 | 2008-03-06 | Nippon Steel Corporation | Procédé d'identification de cause d'occurrence de retour élastique, procédé d'affichage du degré d'influence du retour élastique, procédé d'identification de la partie à l'origine de l'occurrence de retour élastique, procédé de spécif |
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JP2012206158A (ja) | 2012-10-25 |
US20140019071A1 (en) | 2014-01-16 |
EP2692454B1 (en) | 2017-10-18 |
KR101544464B1 (ko) | 2015-08-13 |
US9410855B2 (en) | 2016-08-09 |
JP5765014B2 (ja) | 2015-08-19 |
EP2692454A4 (en) | 2014-10-08 |
MX2013011153A (es) | 2013-11-01 |
CN103459058A (zh) | 2013-12-18 |
EP2692454A1 (en) | 2014-02-05 |
KR20130129457A (ko) | 2013-11-28 |
CN103459058B (zh) | 2015-11-25 |
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