EP4063037A1 - Pressformwerkzeug - Google Patents

Pressformwerkzeug Download PDF

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Publication number
EP4063037A1
EP4063037A1 EP20888886.7A EP20888886A EP4063037A1 EP 4063037 A1 EP4063037 A1 EP 4063037A1 EP 20888886 A EP20888886 A EP 20888886A EP 4063037 A1 EP4063037 A1 EP 4063037A1
Authority
EP
European Patent Office
Prior art keywords
punch
forming
press forming
press
die
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.)
Pending
Application number
EP20888886.7A
Other languages
English (en)
French (fr)
Other versions
EP4063037A4 (de
Inventor
Yasuhiro Kishigami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP4063037A1 publication Critical patent/EP4063037A1/de
Publication of EP4063037A4 publication Critical patent/EP4063037A4/de
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/01—Selection of materials
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/08—Dies with different parts for several steps in a process

Definitions

  • the present invention relates to a tool of press forming, particularly, relates to a tool for press forming a blank into a press forming product by pressing that has a punch bottom and a shallow concave portion or a low convex portion in the punch bottom.
  • the blank is a metal sheet made of a variety of metals, such as a hot rolled steel sheet, a cold rolled steel sheet, a surface treated steel sheet made by subjecting a steel sheet to surface treatment, including, for example, electro galvanizing, hot-dip galvanizing, and organic film treatment, a stainless steel sheet, an aluminum sheet, and a magnesium sheet.
  • the punch bottom is the bottom of a press forming product formed with a punch and a die.
  • the punch bottom is formed with the punch pushed into the die.
  • the terms indicative of directions such as “directly under”, “under”, and “top” are used to refer to the vertical direction in which the punch and the die are placed relative to one another in the direction of press forming.
  • the terms “directly under” and “under” of the punch indicate the direction opposite the die in the press forming direction
  • “top” of the punch indicates the direction of the die in the press forming direction.
  • Patent Literature 1 describes a method of forming a metal sheet with a die and a punch. The method reduces the stress of the metal sheet by stopping the punch during the course of operation starting with the punch contacting the metal sheet and ending with the punch reaching the stroke end, and resuming the forming operation of the metal sheet after a predetermined time elapsed, thereby reducing the forming load.
  • Patent Literature 2 describes a method allowing a reduction in the forming load applied during the press forming process on a blank material with a die and a punch. In the method, the blank material is sequentially formed by a predetermined section with several parts of the punch separately operating.
  • Patent Literature 1 needs a servo press to stop the punch during the forming process, leading to a restriction of the facility.
  • the complex die structure increases the production cost.
  • the method may cause fracture and wrinkles in the high-tensile steel sheet having low formability, during press forming.
  • the present invention aims to provide a press forming tool that allows a reduction in the forming load applied during press forming of a press forming product having a concave portion or a convex portion concaved or convexed in the press forming direction in the punch bottom, while eliminating the necessity of using a complex mechanism or structure.
  • a press forming tool includes: a punch; and a die, wherein the press forming tool is configured to press form a press forming product including a punch bottom and a shallow concave portion or a low convex portion in the punch bottom, the punch includes a punch bottom forming surface to form the punch bottom, a concave shape forming portion to form the concave portion or a convex shape forming portion to form the convex portion in the punch bottom forming surface, and a low Young's modulus member installation region formed under the punch bottom forming surface and accommodating a low Young's modulus member having a lower Young's modulus than that of the punch bottom forming surface, and the low Young's modulus member installation region includes an area directly under the concave shape forming portion or the convex shape forming portion of the punch and has a projected area in a press forming direction that is 110% or greater as large as a projected area of the concave shape forming portion or the convex shape forming portion.
  • the present invention relates to production of a press forming product by press forming that has a punch bottom and a shallow concave portion or a low convex portion in the punch bottom.
  • a punch includes a low Young's modulus member installation region in which a low Young's modulus member having a low Young's modulus is installed, under a punch bottom forming surface of the punch.
  • the punch bottom forming surface is flexed to the low Young's modulus member installation region, which facilitates closeness between a concave shape forming portion or a convex shape forming portion formed in the punch bottom forming surface and a blank. This configuration is effective in minimizing an increase in the forming load applied around the bottom dead center.
  • a press forming tool 1 includes a punch 3, a die 5, and a blank holder 7.
  • the press forming tool 1 is used for press forming to press form a press forming product 11 having a punch bottom 13 and a concave portion 15 that is concaved in the punch bottom 13 and is shallow.
  • the shallow of the concave portion 15 means that at least the depth is smaller than the press forming height of the press forming product 11.
  • the depth of the concave portion 15 in the press forming direction is 10 mm or smaller and is close to the plate thickness.
  • the punch 3 includes a punch bottom forming surface 3a to form the punch bottom 13 of the press forming product 11, a concave shape forming portion 3b to form the concave portion 15 in the punch bottom 13, and a low Young's modulus member installation region 3d formed under the punch bottom forming surface 3a (opposite the die 5 in the press forming direction) inside the punch 3 and accommodating a low Young's modulus member 3c having a lower Young's modulus than that of the punch bottom forming surface 3a.
  • the low Young's modulus member 3c is made of a material of which Young's modulus is lower than a casting and a steel material usually used for the punch 3 and the die 5.
  • the material may include resins, such as a rubber material and a urethane material, and metals, such as aluminum and magnesium.
  • the low Young's modulus member installation region 3d includes the area directly under the concave shape forming portion 3b, and has a projected area A1 in the press forming direction that is 110% or greater as large as a projected area A2 of the concave shape forming portion 3b.
  • the low Young's modulus member 3c is installed so as to occupy the entire low Young's modulus member installation region 3d.
  • the low Young's modulus member 3c is installed to the low Young's modulus member installation region 3d by, for example, fittingly inserting the low Young's modulus member 3c into the punch 3, tightening with bolts, and fixing with adhesive.
  • the die 5 is placed facing the punch 3 with a blank 9 interposed therebetween.
  • the die 5 is designed to relatively move toward the punch 3 in order to form the press forming product 11 in coordination with the punch 3.
  • the die 5 includes a punch bottom forming surface 5a to form the punch bottom 13 of the press forming product 11 and a concave shape forming portion 5b to form the concave portion 15 in the punch bottom 13.
  • the blank holder 7 is disposed opposite the die 5, on the same side as the punch 3 relative to the blank 9.
  • the blank holder 7 is designed to relatively move toward the punch 3 while holding the ends of the blank 9 with the die 5.
  • the press forming product 11 is produced by press forming using the conventional press forming tool 21 including a punch 23, the die 5, and the blank holder 7 as illustrated in FIG. 3 , the blank 9 is placed between the punch 23 and the die 5 with the ends of the blank 9 pinched by the die 5 and the blank holder 7. With the blank 9 pinched by the die 5 and the blank holder 7, the die 5 and the blank holder 7 are relatively moved toward the punch 23, thereby forming the punch bottom 13.
  • the concave shape forming portion 5b of the die 5 pushes the blank 9 into a concave shape forming portion 23b of the punch 23, thereby forming the concave portion 15 in the punch bottom 13.
  • FIG. 4 The broken lines in FIG. 4 indicate the surface conditions of the punch 23 and the die 5 before deformation.
  • the areas hatched by the diagonal lines are areas where the punch 23 and the die 5 are pressed down around the bottom dead center.
  • the punch 23 and the die 5 are not easily elastically deformed, the amount of deformation is small in each of them.
  • the blank 9 In order to form the concave portion 15 with the blank 9 sufficiently fitting the concave shape forming portion 23b of the punch 23, the blank 9 needs to be pressed toward the punch 23 by applying large forming load, such that the plate thickness is made thinner by being pressed against the die 5, around the bottom dead center.
  • the press forming tool 1 having the punch 3 and the die 5 according to the embodiment produces the press forming product 11 by press forming, as illustrated in FIG. 5 , the surfaces of the punch 3 and the die 5 are pressed down around the bottom dead center.
  • the broken lines in FIG. 5 represent the surface conditions of the punch 3 and the die 5 before deformation.
  • the surface of the die 5 is elastically deformed and pressed down around the bottom dead center (areas in the die 5 hatched with diagonal lines in FIG. 5 ). Since the low Young's modulus member installation region 3d is arranged in the region including the area directly under the concave shape forming portion 3b, under the punch bottom forming surface 3a, the punch bottom forming surface 3a around the bottom dead center is flexed to the low Young's modulus member installation region 3d while inducing deformation of the surface of the punch 3 (the hatched areas in the punch 3 in FIG. 5 ).
  • the press forming tool 1 can produce the press forming product 11 having the concave portion 15 formed by press forming while minimizing an increase in the forming load around the bottom dead center.
  • the present invention can further effectively minimize an increase in the forming load around the bottom dead center, when the blank 9 to be pressed is a high-tensile steel sheet of 590 MPa or greater in the MPa class.
  • the press forming tool 1 accommodates the low Young's modulus member 3c inside the punch 3.
  • This structure can reduce the forming load with the punch 3 flexed during the forming process while ensuring the structural strength, even when the structure of the tool does not allow the punch 3 to be hollow (for example, when the press forming tool 1 is too small and thus does not allow the punch 3 to be hollow to secure sufficient strength).
  • the projected area of the low Young's modulus member installation region 3d of the punch 3 in the press forming direction is 110% or greater as large as the projected area of the concave shape forming portion 3b.
  • This structure allows the punch bottom forming surface 3a to be flexed during the press forming process.
  • the thickness of the punch bottom forming surface 3a in the press forming direction may be appropriately set in the range allowing the flection of the punch bottom forming surface 3a.
  • the projected area of the concave shape forming portion 3b is the area projected from the bottom of the concave shape forming portion 3b of the punch bottom forming surface 3a.
  • the punch 3 has the low Young's modulus member 3c installed in the low Young's modulus member installation region 3d in a fashion that entirely occupies the region.
  • a press forming tool 31 may have low Young's modulus members 33c partially installed in a low Young's modulus member installation region 33d of a punch 33.
  • the low Young's modulus members 33c have the Young's modulus lower than that of a punch bottom forming surface 33a of the punch 33
  • the low Young's modulus member installation region 33d includes the area directly under a concave shape forming portion 33b, and the projected area A1 in the press forming direction is 110% or greater as large as the projected area A2 of the concave shape forming portion 33b.
  • the press forming tools 1 and 31 according to the present invention may be designed to press form a press forming product (not illustrated) that has a convex portion that is convexed in the punch bottom in the press forming direction and is low.
  • the low convex portion means that at least the height of the convex portion is smaller than the forming height of the press forming product.
  • the present invention is preferably applicable to such a press forming product that has the convex portion whose height is 10 mm or smaller and nearly equal to the plate thickness.
  • such a press forming product having a convex portion in the punch bottom can be produced by press forming using the press forming tool according to the present invention.
  • the die In the process of forming the convex portion around the bottom dead center, the die is pushed toward the punch, causing the punch bottom forming surface of the punch to be flexed to the low Young's modulus member installation region located below. This configuration can easily achieve closeness between the blank and the convex shape forming portion of the punch.
  • the convex portion is formed while minimizing an increase in the press forming load applied around the bottom dead center.
  • the press forming tool 1 has the die 5 above the punch 3 as illustrated in FIG. 1 , with the direction in which the die 5 descends to the punch 3 defined as the press forming direction.
  • the press forming direction may be the direction in which the punch 3 is lifted to the die 5.
  • the die may be placed under the punch with the punch configured to descend to the die or the die configured to be lifted to the punch (not illustrated). The present invention is not intended to limit the position of the punch relative to the die or the press forming direction.
  • the press forming tool 1 illustrated in FIG. 1 includes the blank holder 7 and produces the press forming product 11 by draw forming with both ends of the blank 9 pinched with the die 5 and the blank holder 7.
  • the present invention may be applied to a press forming tool having no blank holder and configured to produce the press forming product 11 by crash forming with the punch 3 and the die 5.
  • the press forming product 11 is in a hat cross section shape having the punch bottom 13 and the concave portion 15 concaved in the punch bottom 13 in the press forming direction, as illustrated in FIG. 2 .
  • the dimension of each part is indicated in FIG. 2 .
  • the concave portion 15 to be formed in the punch bottom 13 has a depth of 3 mm, which is smaller than the forming height (20 mm) of the press forming product 11 and close to the plate thickness.
  • the press forming product 11 was produced using the press forming tool 1 including the punch 3, the die 5, and the blank holder 7 as illustrated in FIG. 1 .
  • the analyses of the press forming process are described as an example of the invention.
  • the punch 3 of the press forming tool 1 includes the punch bottom forming surface 3a, the concave shape forming portion 3b, and the low Young's modulus member installation region 3d accommodating the low Young's modulus member 3c having Young's modulus lower than that of the punch bottom forming surface 3a, under the punch bottom forming surface.
  • the punch 3 made of FC250 (gray cast iron) having a Young's modulus of 115 GPa was used.
  • the Young's modulus of the low Young's modulus member 3c was set at 0.1 GPa that was lower than the Young's modulus of the punch bottom forming surface 3a of the punch 3.
  • the low Young's modulus member installation region 3d includes the area directly under the concave shape forming portion 3b, and has the projected area A1 in the press forming direction 110% as large as the projected area A2 of the concave shape forming portion 3b.
  • the press forming product 11 was produced using the conventional press forming tool 21 including the punch 23, the die 5, and the blank holder 7 illustrated in FIG. 3 .
  • the analyses of the press forming process are described as a conventional example.
  • FIG. 7 and FIG. 8 illustrate the results of deformation of the punch 3, the punch 23, and the die 5 in the press forming direction measured around the bottom dead center in the conventional example and the example of the invention.
  • the concave shape forming portion 23b of the punch 23 and the concave shape forming portion 5b of the die 5 were deformed in the press forming direction at areas close to the edges.
  • the largest amount of deformation was 0.02 mm.
  • deformation in the press forming direction was observed in extensive areas under the concave shape forming portion 3b of the punch 3 and above the concave shape forming portion 5b of the die 5.
  • the largest amount of deformation was 0.05 mm, which was a significant increase from the conventional example.
  • FIGS. 9 are graphs indicating the relation between the forming stroke and the forming load in the press forming process.
  • the forming load gradually increases after start of forming (the forming stroke 0 mm), and sharply increases around the bottom dead center (the forming stroke about 21 to 23 mm).
  • the forming load applied from the start of forming until around the bottom dead center (the forming stroke 22.7 mm) was almost the same between the conventional example and the example of the invention.
  • the forming load around the bottom dead center was small in the example of the invention, in comparison to the conventional example.
  • FIG. 10 is a graph indicating the forming load of the conventional example and the example of the invention around the bottom dead center (forming stroke 23 mm). As indicated in FIG. 10 , the forming load of the example of the invention was smaller than the conventional example by approximately 2.0 tonf.
  • the forming load is drastically decreased.
  • the forming load was similar with the results obtained when the ratio of the projected area A1 to the projected area A2 in FIG. 11 was smaller than 100%. The forming load therefore could not effectively get reduced.
  • the press forming tool 1 allows a reduction in the forming load applied around the bottom dead center, by flexing the punch bottom forming surface 3a of the punch 3 toward the low Young's modulus member installation region 3d formed under the punch bottom forming surface 3a during press forming of the press forming product 11 having the concave portion 15 or convex portion concaved or convexed in the punch bottom 13 in the press forming direction.
  • a tool of press forming that allows a reduction in the forming load applied in the press forming process to produce a press forming product having a concave portion or a convex portion concaved or convexed in the press forming direction in the punch bottom, without employing any complex mechanisms or structures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
EP20888886.7A 2019-11-20 2020-08-25 Pressformwerkzeug Pending EP4063037A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019209314A JP7207276B2 (ja) 2019-11-20 2019-11-20 プレス成形金型
PCT/JP2020/032025 WO2021100276A1 (ja) 2019-11-20 2020-08-25 プレス成形金型

Publications (2)

Publication Number Publication Date
EP4063037A1 true EP4063037A1 (de) 2022-09-28
EP4063037A4 EP4063037A4 (de) 2023-01-11

Family

ID=75963687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20888886.7A Pending EP4063037A4 (de) 2019-11-20 2020-08-25 Pressformwerkzeug

Country Status (7)

Country Link
US (1) US20220274151A1 (de)
EP (1) EP4063037A4 (de)
JP (1) JP7207276B2 (de)
KR (1) KR20220082896A (de)
CN (1) CN114728323A (de)
MX (1) MX2022005542A (de)
WO (1) WO2021100276A1 (de)

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524753A (en) * 1978-08-10 1980-02-22 Honda Eng Kk Drawing die
JPS56142818U (de) * 1980-03-21 1981-10-28
JPS5770722U (de) * 1980-10-20 1982-04-28
JPS63207426A (ja) * 1987-02-20 1988-08-26 Honda Motor Co Ltd 樹脂製パンチ
SU1599144A1 (ru) * 1988-07-25 1990-10-15 Предприятие П/Я А-3327 Устройство дл штамповки
JPH0716729B2 (ja) * 1990-03-19 1995-03-01 工業技術院長 弾性変形型を用いた型成形法
DE4122323A1 (de) * 1991-07-05 1993-01-14 Erbsloeh Julius & August Elastisches werkzeug zum verformen
JP2010207907A (ja) 2009-03-12 2010-09-24 Nissan Motor Co Ltd プレス方法と装置
JP2011245525A (ja) 2010-05-27 2011-12-08 Honda Motor Co Ltd 金属板のプレス成形方法
CN202343747U (zh) * 2011-11-18 2012-07-25 青岛海尔模具有限公司 拉延模具
US9770749B2 (en) * 2014-08-08 2017-09-26 GM Global Technology Operations LLC Hybrid stamping system
CN104492939A (zh) * 2014-10-16 2015-04-08 上海众大汽车配件有限公司 一种汽车固定支架总成拉延模具
EP3015183B1 (de) * 2014-11-03 2019-09-04 Peter Amborn Umformpresse zum Umformen eines flächenförmigen Rohlings aus Metall mit zwei aufeinander zu verfahrbaren Gestellteilen
CN104525673B (zh) * 2014-11-19 2018-05-18 宁波市普力升工贸有限公司 一种304不锈钢拉伸工件的温间拉伸工艺
CN205414117U (zh) * 2015-10-23 2016-08-03 聂国顺 一种冲压模具的拉深模
DE102017003955A1 (de) * 2017-04-22 2017-10-26 Daimler Ag Formwerkzeug zur Verformung eines ersten Hohlkörpers zur Einstellung einer Steckverbindung des ersten Hohlkörpers mit einem zweiten Hohlkörper
DE102019213531B4 (de) * 2019-09-05 2021-06-24 Volkswagen Aktiengesellschaft Werkzeugteil für ein Blechumformwerkzeug mit additiv erzeugtem Wirkflächenbereich und Verfahren zur Herstellung

Also Published As

Publication number Publication date
EP4063037A4 (de) 2023-01-11
US20220274151A1 (en) 2022-09-01
KR20220082896A (ko) 2022-06-17
JP7207276B2 (ja) 2023-01-18
JP2021079407A (ja) 2021-05-27
WO2021100276A1 (ja) 2021-05-27
MX2022005542A (es) 2022-06-08
CN114728323A (zh) 2022-07-08

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