WO2021161579A1 - プレス成形品の形状変化予測方法 - Google Patents
プレス成形品の形状変化予測方法 Download PDFInfo
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- WO2021161579A1 WO2021161579A1 PCT/JP2020/037620 JP2020037620W WO2021161579A1 WO 2021161579 A1 WO2021161579 A1 WO 2021161579A1 JP 2020037620 W JP2020037620 W JP 2020037620W WO 2021161579 A1 WO2021161579 A1 WO 2021161579A1
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- press
- molded product
- shape
- residual stress
- springback
- Prior art date
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- 230000008859 change Effects 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004458 analytical method Methods 0.000 claims abstract description 52
- 238000000465 moulding Methods 0.000 claims description 69
- 239000002184 metal Substances 0.000 claims description 24
- 230000009467 reduction Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 13
- 230000000052 comparative effect Effects 0.000 description 35
- 238000005452 bending Methods 0.000 description 19
- 238000011156 evaluation Methods 0.000 description 18
- 238000004088 simulation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000002040 relaxant effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- 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]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/30—Deep-drawing to finish articles formed by deep-drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- 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
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/24—Sheet material
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/18—Manufacturability analysis or optimisation for manufacturability
Definitions
- the present invention relates to a shape change prediction method for a press-formed part, and in particular, the press-molded product is released from a die and springed back.
- the present invention relates to a method for predicting a shape change of a press-molded product, which is used later to predict a shape change of the press-molded product.
- Press molding is a manufacturing method that can manufacture metal parts at low cost and in a short time, and is used for manufacturing many automobile parts.
- higher-strength metal sheets have been used for automobile parts. It has come to be used for press molding.
- the present invention has been made to solve the above-mentioned problems, and predicts a shape change of the press-molded product after a lapse of time after springing back at the moment when the press-molded product is released from the mold. It is an object of the present invention to propose a method for predicting a shape change of a press-molded product.
- the bent portion is a punch shoulder portion connecting the top plate portion and the vertical wall portion in a press-molded product having a top plate portion, a vertical wall portion, and a flange portion. And / or a die shoulder that connects the vertical wall portion and the flange portion.
- FIG. 1 is a flow chart showing a processing flow of a method for predicting a shape change of a press-molded product according to an embodiment of the present invention.
- FIG. 2 is a view showing a press-molded product having a hat-shaped cross-sectional shape, which is the object of the embodiment of the present invention and the first embodiment ((a) perspective view, (b) top view).
- FIG. 3 is a view showing a press-molded product having a Z-shaped cross-sectional shape, which is the target of the second embodiment ((a) perspective view, (b) top view).
- FIG. 4 is a diagram showing a press-molded product having an L-shaped cross-sectional shape, which is the target of the third embodiment.
- FIG. 1 is a flow chart showing a processing flow of a method for predicting a shape change of a press-molded product according to an embodiment of the present invention.
- FIG. 2 is a view showing a press-molded product having a hat-shaped cross-sectional shape, which
- FIG. 5 is a diagram showing a press-molded product targeted in Example 4 ((a) perspective view, (b) top view).
- FIG. 6 is a diagram showing a press-molded product having a U-shaped cross section as an example of a shape change measurement target with the passage of time.
- FIG. 7 shows, as an example of the shape change of the press-molded product with the passage of time, the opening amount with the passage of time after the press-molded product having the U-shaped cross section shown in FIG. It is a figure which shows the measurement result.
- FIG. 8 is a stress-strain diagram illustrating a stress relaxation phenomenon in which stress relaxes and decreases with the passage of time while the strain is kept constant.
- the inventors focused on the stress relaxation phenomenon in the stress-strain diagram in which the stress gradually relaxes and decreases with the passage of time while the strain remains constant. Even in the press-molded product 1 after springback, the residual stress in the punch shoulder portion 9 and the die shoulder portion 11 bent by the press molding is gradually relaxed with the passage of time, so that the force moment of the press-molded product 1 is obtained. We found that the equilibrium shape was changing.
- the method for predicting the shape change of the press-molded product determines the shape change of the press-molded product with the passage of time after springing back at the moment when the press-molded product is released from the mold.
- it includes a shape / residual stress acquisition step S1 immediately after springback, a residual stress relaxation reduction setting step S3, and a shape analysis step S5.
- the press-molded product has a hat-shaped cross-sectional shape having a top plate portion 3, a vertical wall portion 5, and a flange portion 7 as shown in FIG. 2, and the bending portion is on the side of the top plate portion 3.
- the punch shoulder portion 9 and the die shoulder which are the bent portions of the press-molded product 1 immediately after the springback, are obtained by the springback analysis.
- the value of the residual stress relaxed and reduced from the residual stress is set, and the shape of the press-formed product 1 for which the value of the residual stress is relaxed and reduced is obtained by analysis.
- the stress relaxation and the shape change with the passage of time in the actual press-molded product 1 are simulated, and after springing back at the moment when the die is released from the mold, the shape change with the passage of time of the press-molded product 1 after that is predicted. be able to.
- a press by bending molding of a press-molded product 51 having a shape simulating a floor cross member of an automobile as shown in FIG. Molding was performed.
- the press-molded product 51 is provided with a mounting flange portion 59 that bends from the longitudinal end sides of each of the top plate portion 53, the vertical wall portion 55, and the flange portion 57 and extends outward.
- the punch shoulder portion 61 that connects the top plate portion 53 and the vertical wall portion 55, the lower side of the vertical wall portion 55 and the side side of the flange portion 57 are connected, and the top plate portion 53 and the vertical wall portion 55 are connected.
- It also has a die shoulder portion 63 that connects the longitudinal end side of the flange portion 57 and the mounting flange portion 59.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
スプリングバック直後の形状・残留応力取得工程S1は、プレス成形品1のスプリングバック解析により、スプリングバックした直後のプレス成形品1の形状及び残留応力を取得する工程である。
残留応力緩和減少設定工程S3は、スプリングバック直後の形状・残留応力取得工程S1において取得したスプリングバックした直後のプレス成形品1のパンチ肩部9及びダイ肩部11に対し、それらの残留応力よりも緩和し減少させた残留応力の値を設定する工程である。
形状解析工程S5は、残留応力緩和減少設定工程S3で残留応力を緩和減少設定したプレス成形品1について力のモーメントが釣り合う形状を求める解析を行う工程である。
実施例1では、まず、以下の表1に一例を示す機械的特性を持つ金属板Aを用い、図2に示すハット型断面形状のプレス成形品1の曲げ成形によるプレス成形を行った。プレス成形品1の成形下死点形状は、パンチ肩部9の曲率半径及び曲げ角を5mm及び95°とし、ダイ肩部11の曲率半径及び曲げ角度を5mm及び95°とした。なお、金属板Aの板厚は、1.6mmであり、降伏強度(yield strength)は、880MPaであり、引張強度は、1210MPaであり、伸び(elongation)は、13%である。
予測値の差分(mm)=De-Dc ・・・(1)
予測値の誤差(%)=(De-Dc)÷Dc×100 ・・・(2)
実施例2では、まず、前述した実施例1と同様に表1に示す機械的特性(mechanical properties)をもつ金属板Aを用い、図3に示すZ字状断面形状のプレス成形品21の曲げ成形によるプレス成形を行った。プレス成形品21の成形下死点形状は、パンチ肩部29の曲率半径及び曲げ角を7mm及び100°とし、ダイ肩部31の曲率半径及び曲げ角度を7mm及び100°とした。
実施例3では、まず、前掲した表1に示す機械的特性をもつ金属板Aを用い、図4に示すL字状断面形状のプレス成形品41の曲げ成形によるプレス成形を行った。プレス成形品41の成形下死点形状は、パンチ肩部47の曲率半径及び曲げ角を6mm及び120°とした。そして、成形下死点までプレス成形したプレス成形品41を金型から離型した後、プレス成形品41の形状の経時変化を測定した。
実施例4では、まず、前掲した表1に示す機械的特性をもつ金属板Aを用い、図5に示すような、自動車のフロアクロスメンバーを模擬した形状のプレス成形品51の曲げ成形によるプレス成形を行った。プレス成形品51は、天板部53、縦壁部55及びフランジ部57それぞれの長手方向端辺から屈曲して外方に延出する取付フランジ部(mounting flange portion)59が設けられ、曲げ部として、天板部53と縦壁部55とを接続するパンチ肩部61と、縦壁部55の下辺とフランジ部57の側辺とを接続し、かつ、天板部53、縦壁部55及びフランジ部57の長手方向端辺と取付フランジ部59とを接続するダイ肩部63と、を有する。
3 天板部
5 縦壁部
7 フランジ部
9 パンチ肩部
11 ダイ肩部
21 プレス成形品
23 天板部
25 縦壁部
27 フランジ部
29 パンチ肩部
31 ダイ肩部
41 プレス成形品
43 天板部
45 縦壁部
47 パンチ肩部
51 プレス成形品
53 天板部
55 縦壁部
57 フランジ部
59 取付フランジ部
59a 天板側取付フランジ部
61 パンチ肩部
63 ダイ肩部
65 長手方向端部取付部
71 プレス成形品
73 天板部
75 縦壁部
Claims (4)
- プレス成形品を金型から離型した瞬間にスプリングバックした後における、その後の前記プレス成形品の時間経過に伴う形状変化を予測するプレス成形品の形状変化予測方法であって、
前記プレス成形品のスプリングバック解析により、スプリングバックした直後の前記プレス成形品の形状及び残留応力を取得するスプリングバック直後の形状・残留応力取得工程と、
該取得したスプリングバックした直後の前記プレス成形品における全ての曲げ部又は一部の曲げ部に対し、その残留応力よりも緩和し減少させた残留応力の値を設定する残留応力緩和減少設定工程と、
前記曲げ部における残留応力の値を緩和減少設定した前記プレス成形品について、力のモーメントが釣り合う形状を求める形状解析工程と、を含む、プレス成形品の形状変化予測方法。 - 前記曲げ部は、天板部と縦壁部とを有するプレス成形品における前記天板部と前記縦壁部とを接続するパンチ肩部である、請求項1に記載のプレス成形品の形状変化予測方法。
- 前記曲げ部は、天板部と縦壁部とフランジ部とを有するプレス成形品における前記天板部と前記縦壁部とを接続するパンチ肩部、及び/又は、前記縦壁部と前記フランジ部とを接続するダイ肩部である、請求項1に記載のプレス成形品の形状変化予測方法。
- 前記プレス成形品のプレス成形に供するブランクは、引張強度が150MPa級以上2000MPa級以下の金属板である、請求項1乃至3のいずれか一項に記載のプレス成形品の形状変化予測方法。
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KR1020227027783A KR20220125347A (ko) | 2020-02-14 | 2020-10-02 | 프레스 성형품의 형상 변화 예측 방법 |
MX2022009561A MX2022009561A (es) | 2020-02-14 | 2020-10-02 | Metodo de prediccion de cambio de forma para pieza conformada por presion. |
EP20919234.3A EP4104946A4 (en) | 2020-02-14 | 2020-10-02 | METHOD FOR PREDICTING SHAPE CHANGE OF A DIE-COLDED PRODUCT |
US17/798,772 US20230108627A1 (en) | 2020-02-14 | 2020-10-02 | Shape change prediction method for press formed part |
CN202080095808.6A CN115066303A (zh) | 2020-02-14 | 2020-10-02 | 冲压成型品的形状变化预测方法 |
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JP2020023153A JP7243657B2 (ja) | 2020-02-14 | 2020-02-14 | プレス成形品の形状変化予測方法 |
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US (1) | US20230108627A1 (ja) |
EP (1) | EP4104946A4 (ja) |
JP (1) | JP7243657B2 (ja) |
KR (1) | KR20220125347A (ja) |
CN (1) | CN115066303A (ja) |
MX (1) | MX2022009561A (ja) |
WO (1) | WO2021161579A1 (ja) |
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JP7342921B2 (ja) * | 2021-09-29 | 2023-09-12 | Jfeスチール株式会社 | プレス成形品の形状変化予測方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0679372A (ja) * | 1991-08-12 | 1994-03-22 | Avco Corp | 成形方法 |
JP2008055476A (ja) * | 2006-08-31 | 2008-03-13 | Nippon Steel Corp | スプリングバック発生原因部位特定方法、その装置、及びそのプログラム |
JP2013113144A (ja) | 2011-11-25 | 2013-06-10 | Mitsubishi Heavy Ind Ltd | 構造部材の経年曲がり量予測方法 |
JP5795151B2 (ja) | 2010-06-03 | 2015-10-14 | Jfeスチール株式会社 | プレス部品の成形解析方法 |
JP5866892B2 (ja) | 2011-09-06 | 2016-02-24 | Jfeスチール株式会社 | 応力−歪み関係評価方法およびスプリングバック量予測方法 |
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CN103995927B (zh) * | 2006-08-31 | 2017-01-04 | 新日铁住金株式会社 | 回弹对策位置特定方法以及回弹对策位置特定装置 |
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2020
- 2020-02-14 JP JP2020023153A patent/JP7243657B2/ja active Active
- 2020-10-02 MX MX2022009561A patent/MX2022009561A/es unknown
- 2020-10-02 WO PCT/JP2020/037620 patent/WO2021161579A1/ja active Application Filing
- 2020-10-02 CN CN202080095808.6A patent/CN115066303A/zh active Pending
- 2020-10-02 US US17/798,772 patent/US20230108627A1/en active Pending
- 2020-10-02 EP EP20919234.3A patent/EP4104946A4/en active Pending
- 2020-10-02 KR KR1020227027783A patent/KR20220125347A/ko unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0679372A (ja) * | 1991-08-12 | 1994-03-22 | Avco Corp | 成形方法 |
JP2008055476A (ja) * | 2006-08-31 | 2008-03-13 | Nippon Steel Corp | スプリングバック発生原因部位特定方法、その装置、及びそのプログラム |
JP5795151B2 (ja) | 2010-06-03 | 2015-10-14 | Jfeスチール株式会社 | プレス部品の成形解析方法 |
JP5866892B2 (ja) | 2011-09-06 | 2016-02-24 | Jfeスチール株式会社 | 応力−歪み関係評価方法およびスプリングバック量予測方法 |
JP2013113144A (ja) | 2011-11-25 | 2013-06-10 | Mitsubishi Heavy Ind Ltd | 構造部材の経年曲がり量予測方法 |
Non-Patent Citations (1)
Title |
---|
LIM, HOJUN: "Time-dependent Springback", INTERNATIONAL JOURNAL OF MATERIAL FORMING, 3 April 2008 (2008-04-03), pages 157 - 160, XP055848159 * |
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EP4104946A1 (en) | 2022-12-21 |
JP2021126683A (ja) | 2021-09-02 |
MX2022009561A (es) | 2022-09-09 |
EP4104946A4 (en) | 2023-07-12 |
CN115066303A (zh) | 2022-09-16 |
JP7243657B2 (ja) | 2023-03-22 |
KR20220125347A (ko) | 2022-09-14 |
US20230108627A1 (en) | 2023-04-06 |
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