EP2289694B1 - Formkühlungsvorrichtung mit druckhärtung - Google Patents

Formkühlungsvorrichtung mit druckhärtung Download PDF

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Publication number
EP2289694B1
EP2289694B1 EP09800584A EP09800584A EP2289694B1 EP 2289694 B1 EP2289694 B1 EP 2289694B1 EP 09800584 A EP09800584 A EP 09800584A EP 09800584 A EP09800584 A EP 09800584A EP 2289694 B1 EP2289694 B1 EP 2289694B1
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EP
European Patent Office
Prior art keywords
cooling water
steel plate
press hardening
cooling
temperature
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.)
Not-in-force
Application number
EP09800584A
Other languages
English (en)
French (fr)
Other versions
EP2289694A2 (de
EP2289694A4 (de
Inventor
Soonyong Kwon
Seungtaek Hong
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.)
Hyundai Steel Co
Original Assignee
Hyundai Steel Co
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 Hyundai Steel Co filed Critical Hyundai Steel Co
Publication of EP2289694A2 publication Critical patent/EP2289694A2/de
Publication of EP2289694A4 publication Critical patent/EP2289694A4/de
Application granted granted Critical
Publication of EP2289694B1 publication Critical patent/EP2289694B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • 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
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B30B15/064—Press plates with heating or cooling means
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the present invention relates to a press hardening die cooling device, and more particularly, to a press hardening die cooling device which has a structure improved for adjusting cooling rate in order to adjust hardness of the surface structure of a portion that is cut by trimming die of a steel plate blank.
  • a method of manufacturing a high-strength press-hardened product is to heat a steel material of which hardenability is improved by adding B, Mo, and Cr etc. at a high temperature, about 900°C, above an Ac3 transformation point to be completely changed into an austenite state, and then hot-forming the steel plate at one time into a product shape with a press die and rapidly cooling it into martensite structure.
  • a steel plate is easy to form, because its ductility is increased when being heated at a high temperature.
  • the machinability of a steel plate manufactured by press hardening is slightly better than that of typical steel plates for machining and considerably better than that of high-strength steel.
  • a steel plate manufactured by press hardening has very high strength (above 1,400 MPa) such that it is significantly advantageous in terms of specific strength, obtained by dividing yield strength by density, and thus can considerably contribute to reducing weight of vehicles. Further, the steel plate manufactured by press hardening is used to manufacture ultra high-strength parts that are difficult to form, because there is little spring back after machining.
  • Press hardening includes heating a blank before being hardened from a wound steel plate coil in a furnace, and carrying the blank into a press with a robot, and pressing it in the related art.
  • the press includes upper and lower dies of a press hardening die, cooling water is supplied to cooling water supplier for the upper and lower dies to harden the surface structure of a steel plate blank and cools the steel plate blank.
  • Steel plate blanks of the related art are cut into a middle part which is substantially used for a part, and scraps which are disposed at both sides and are substantially cut by a trimming die in the post-machining.
  • the portion to be trimmed by a trimming die of the related art is hardened by the cooling using a press die described above.
  • the trimming die is severely worn in trimming, and accordingly machinability of the trimming is reduced, work loss is caused by replacing the trimming die, and productivity decreases.
  • German patent DE 10 2005 032113 B1 discloses an apparatus for thermally deforming and partially hardening a component in a mold of at least two parts, between which the component, at its hardening temperature or above, is compressed to the mold contour by a press.
  • German patent application DE 197 23 655 A1 discloses a method for manufacturing a steel sheet product by heating a cut sheet, hot working the steel sheet in a mold pair and hardening of the formed product by cooling, while it is still in the mold pair. Afterwards the steel sheet product is further processed.
  • the present invention has been made in an effort to provide a press hardening die cooling device that facilitates trimming a steel plate blank by applying cooling processes to a part differently from the other part of the blank, by using an improved structure of a press hardening die.
  • an embodiment of the present invention provides a press hardening die cooling device, which includes: a press hardening die including upper and lower dies and pressing a steel plate blank; a plurality of cooling water suppliers spaced apart from each other in the upper and lower dies to be channels through which cooling water flows; and a cooling water temperature adjuster configured to adjust temperature of the cooling water supplied to the cooling water suppliers, wherein the cooling water temperature adjuster includes a controller that operates such that cooling water is supplied at a higher temperature to the cooling water suppliers close to trimming portions of the steel plate blank than the other cooling water suppliers in the cooling suppliers, and wherein the controller includes a heater configured to heat the cooling water supplied to the cooling water suppliers close to trimming portions.
  • the controller controls the heater to maintain the temperature of the cooling water supplied to the cooling water suppliers close to the trimming portions between 45 and 80°C.
  • Holes are formed between the cooling water suppliers close to the trimming portions of the steel plate blank and the contact surface of the steel plate blank.
  • the press hardening die is provided with insulators.
  • the press hardening die cooling device further includes temperature sensors disposed between the trimming portions of the steel plate blank and the cooling water supplier to sense temperature of the press hardening die, and outputting sensed signals to the controller.
  • the cooling water temperature adjuster controls temperature of the cooling water such that the trimming portions of the steel plate blank changes to a mixed structure of ferrite, pearlite, and bainite.
  • a press hardening die cooling device which includes: a press hardening die including upper and lower dies provided with insulators therein and pressing a steel plate blank; a plurality of cooling water suppliers spaced apart from each other in the upper and lower dies to be channels through which cooling water flows; and a cooling water temperature adjuster adjusting temperature of the cooling water supplied to the cooling water suppliers using temperature sensors disposed in the press hardening die.
  • the present invention provides an apparatus for a press hardening die which is improved to decrease cooling rate of trimming portions in pressing a steel plate blank for manufacturing a part for press hardening. According to the embodiments of the present invention, it is possible to improve durability and productivity by reducing wear of the trimming die, because it is possible to prevent the trimming portion from changing to a martensite structure having high hardness by decreasing cooling rate by the cooling water suppliers in the upper and lower dies to prevent the trimming portions from being rapidly cooled.
  • the first embodiment of a press hardening die cooling device includes: a press hardening die P composed of upper and lower dies 10 and 20 equipped with cooling water suppliers 12 and 22 therein to press a steel plate blank S from the top and the bottom; and a cooling water temperature adjuster disposed between the cooling water suppliers 12 and 22 of the upper and lower dies 10 and 20 and the contact surface of the steel plate blank S to adjust temperature of cooling water supplied to the steel plate blank S.
  • the cooling water temperature adjuster is provided with a controller 100 for supplying cooling water at different temperatures to the cooling water suppliers 12 and 22, and the controller 100 includes a heater 150 for heating the cooling water supplied to the cooling water suppliers 12 and 22 close to trimming portions T1.
  • the controller 100 controls the turning on/off of the heater 150 such that the temperature of the cooling water, which is supplied to the cooling water suppliers 12 and 22 close to the trimming portions T1, is maintained between 45 and 80°C.
  • the other cooling suppliers 12 and 22 are supplied with cooling water at a temperature between 10 and 25°Cwhich is the same as in the related art.
  • controller 100 operates such that cooing water at 10 to 25°C is supplied to the cooling water suppliers 12 and 22 close to the middle portion of the steel plate blank S, which will be a part, and cooling water at 45 to 80°C heated by the heater 150 is supplied to the cooling water suppliers 12 and 22 close to the trimming portions T1 located at both sides.
  • adjusting the temperature of the cooling water between 45 and 80°C is for transforming the structure of the trimming portions T1 in the steel plate blank S into a mixed structure with ferrite, pearlite, and bainite, which has excellent toughness and ductility, as compared with a martensite structure.
  • a press hardening die cooling device controls cooling rate of the cooling water suppliers 12 and 22 during the press hardening of the steel plate blank heated at 900°C or more through a furnace and carried into the press hardening die P using a robot in order to manufacture a press-hardened product such that heat conduction rate of the trimming portions T1 interfacing each scrap and the middle portion which will be a product is different from the other portions of the steel plate blank S.
  • the some cooling air suppliers 12 and 22 which are close to the trimming portions T1 among the cooling water suppliers 12 and 22 disposed in the upper and lower dies 10 and 20 of the press hardening die P are supplied with cooling water at a higher temperature than the other portions such that the cooling rate becomes lower at the trimming portions T1 than the other portions to be trimmed, and accordingly, hardenability can be more decreased than the other portions of the steel plate blank S.
  • the trimming portions T1 have lower cooling rate than the other portions of the steel plate blank S in pressing, and thus, the structures become having lower hardness than the other portions.
  • the other portions of the steel plate blank S except for the portions T1 to be trimmed in trimming process are change into a martensite structure having high hardness, whereas the trimming portions are changed into a ferrite + pearlite + bainite structure, which has lower hardness and better machinability than the martensite structure.
  • hardenability of the trimming portions T1 is variable in accordance with cooling water temperature, and for example, there is a relationship that the cooling rate decreases when the cooling water temperature increases and the cooling rate increases when the cooling water temperature decreases.
  • FIG. 2 is a view showing a second embodiment of the present invention, in which holes 210 are formed through the upper and lower dies , between the cooling water suppliers 12 and 22 close to the trimming portions T1 and the contact surface of the steel plate blank S.
  • the holes are formed to change the trimming portions T1 of the steel plate blank S into a mixed structure with ferrite + pearlite + bainite by reducing the rate of heat conduction to the cooling water suppliers 12 and 22, as described above.
  • heat transferred from the cooling water suppliers 12 and 22 is conducted to the trimming portions T1 through the holes 210 such that cooling performance of the cooling water decreases at the portions than the other portions and the trimming portions T1 of the steel plate blank S are prevented from being rapidly cooled.
  • the holes 210 are formed at both of the upper and lower dies 10 and 20, the hole may be formed only at the upper die or the lower die.
  • the hole 210 has a rectangular or a circular cross section to decrease heat transfer efficiency.
  • FIG. 3 is a view showing the configuration of a third embodiment of the present invention.
  • insulators 300 are vertically disposed in the upper and lower dies 10 and 20 of the press hardening die P.
  • the insulators 300 are vertically arranged to divide the upper and lower dies of the press hardening die P around the trimming portions T1.
  • the press hardening die P is divided into the middle portion and both sides by the insulators 300, it is possible to provide different cooling performance to each portion of the steel plate blank by supplying cooling water of the cooling water suppliers 12 and 22 with different temperatures.
  • FIG. 4 is a view showing the configuration of a fourth embodiment of the present invention, which includes the components of the embodiments described above and further includes temperature sensors 155 that are disposed in the press hardening die P to sense the internal temperature of the die and outputs sensed signals to the controller 100.
  • the temperature sensors 155 sense the temperature of the die in real time such that the heater 150 heats the cooling water and that temperature of specific portions is increased or maintained when the temperature of the die is decreased under temperature set in advance in the controller 100.
  • FIG. 5 is a view showing the configuration of a fifth embodiment of the present invention, in which the diameter of the cooling water suppliers 12 and 22 close to the trimming portions T1 is set smaller than the diameter of the other cooling water suppliers 12 and 22.
  • FIG. 6 is a view showing the configuration of a sixth embodiment of the present invention, in which the cooling water suppliers 12 and 22 close to the trimming portions T1 at both sides in the press hardening die P are dispose further from the contact surface of the steel plate blank than the other cooling water suppliers 12 and 22.
  • the cooling water suppliers 12 close to the trimming portions T1 in the upper die are disposed at a level higher than the other water suppliers 12 in the upper die, while the water suppliers 22 close to the trimming portions T1 in the lower die are disposed at a level lower than the other water suppliers 22, in the figure.
  • the fifth and sixth embodiments of the present invention show that it is possible to make cooling performance of each portion of the steel plate blank different without making temperature of the supplied cooling water different.
  • the embodiments of the present invention can prevent the trimming portions from changing to the martensite structure having high hardness by preventing the trimming portions T1 of the steel plate blanks S from being rapidly cooled by way of making the cooling rate of portions different using the cooling water suppliers 12 and 22 in the upper and lower dies 10 and 20 when pressing the steel plate blanks S.
  • FIG. 7 temperature distribution of the steel plate blank S after the pressing is shown, in which the section A shows cooling rate at the middle portion of the steel plate blanks S and the section B shows cooling rate to time at the trimming portions T1.
  • the cooling rates of the portions are different in the steel plate blank S. Accordingly, the structure corresponding to the section A is cooled at a rate of 17 to 24°C per second from 950°C to 800°C and then hardened by rapid cooling into the martensite structure, and the structure corresponding to the section B is slowly cooled from 800°C into the mixed structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (6)

  1. Presshärtungsstempel-Kühlungsvorrichtung, die Folgendes umfasst:
    einen Presshärtungsstempel, der einen oberen und einen unteren Stempelabschnitt aufweist und konfiguriert ist, um einen Stahlplattenrohling zu pressen;
    mehrere Kühlwasserzuführungen, die im oberen und im unteren Stempelabschnitt voneinander beabstandet sind und Kanäle bilden, durch die Kühlwasser strömt; und
    eine Kühlwassertemperatur-Einstelleinrichtung, die konfiguriert ist, die Temperatur des Kühlwassers, das den Kühlwasserzuführungen zugeführt wird, einzustellen, wobei die Kühlwassertemperatur-Einstelleinrichtung eine Steuereinheit umfasst, die konfiguriert ist, in der Weise zu arbeiten, dass das Kühlwasser einer der mehreren Kühlwasserzuführungen in der Nähe eines Zurichtabschnitts des Stahlplattenrohlings mit einer höheren Temperatur als den anderen Kühlwasserzuführungen unter den mehreren Kühlwasserzuführungen zugeführt wird, und wobei die Steuereinheit eine Heizeinrichtung enthält, die konfiguriert ist, das Kühlwasser, das der Kühlwasserzuführung in der Nähe des Zurichtabschnitts zugeführt wird, zu erhitzen.
  2. Presshärtungsstempel-Kühlvorrichtung nach Anspruch 1, wobei die steuereinheit konfiguriert ist, die Heizeinrichtung so zu steuern, dass sie die Temperatur des der Kühlwasserzuführung in der Nähe des Zurichtabschnitts zugeführten Kühlwassers im Bereich von 45 bis 80 °C hält.
  3. Presshärtungsstempel-Kühlvorrichtung nach den Ansprüchen 1 oder 2, die ferner ein Loch aufweist, das zwischen der Kühlwasserzuführung in der Nähe des Zurichtabschnitts des Stahlplattenrohlings und einer Stahlplattenrohling-Kontaktoberfläche ausgebildet ist.
  4. Presshärtungsstempel-Kühlungsvorrichtung nach den Ansprüchen 1 bis 3, wobei der Presshärtungsstempel mit einem Isolator versehen ist.
  5. Presshärtungsstempel-Kühlvorrichtung nach den Ansprüchen 1 bis 4, die ferner Temperatursensoren umfasst, die zwischen dem Zurichtabschnitt des Stahlplattenrohlings und der Kühlwasservorrichtung angeordnet sind, um die Temperatur des Presshärtungsstempels zu erfassen und um Erfassungssignale an die Steuereinheit auszugeben.
  6. Presshärtungsstempel-Kühlungsvorrichtung nach einem der Ansprüche 1 bis 5, wobei die Kühlwassertemperatur-Einstelleinrichtung konfiguriert ist, um die Temperatur des Kühlwassers in der Weise zu steuern, dass der Zurichtabschnitt des Stahlplattenrohlings in eine Mischstruktur aus Ferrit, Perlit und Bainit geändert wird.
EP09800584A 2008-07-25 2009-07-24 Formkühlungsvorrichtung mit druckhärtung Not-in-force EP2289694B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20080072979 2008-07-25
PCT/KR2009/004133 WO2010011103A2 (ko) 2008-07-25 2009-07-24 프레스 경화용 금형의 냉각장치

Publications (3)

Publication Number Publication Date
EP2289694A2 EP2289694A2 (de) 2011-03-02
EP2289694A4 EP2289694A4 (de) 2011-05-18
EP2289694B1 true EP2289694B1 (de) 2013-01-09

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EP09800584A Not-in-force EP2289694B1 (de) 2008-07-25 2009-07-24 Formkühlungsvorrichtung mit druckhärtung

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US (1) US20110068519A1 (de)
EP (1) EP2289694B1 (de)
JP (1) JP5403768B2 (de)
KR (1) KR101149233B1 (de)
WO (1) WO2010011103A2 (de)

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KR100711386B1 (ko) * 2005-12-21 2007-04-30 주식회사 포스코 열연 강판의 냉각 제어 방법
KR100719760B1 (ko) * 2005-12-29 2007-05-17 주식회사 포스코 균일한 경도를 갖는 열간 프레스 성형 제품을 위한 금형냉각 장치 및 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2835187A1 (de) 2013-08-09 2015-02-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Herstellen eines pressgehärteten Bauteils
DE102013013270A1 (de) 2013-08-09 2015-02-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Herstellen eines pressgehärteten Bauteils

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US20110068519A1 (en) 2011-03-24
KR20100011958A (ko) 2010-02-03
EP2289694A2 (de) 2011-03-02
WO2010011103A2 (ko) 2010-01-28
JP2011523375A (ja) 2011-08-11
JP5403768B2 (ja) 2014-01-29
KR101149233B1 (ko) 2012-05-29
WO2010011103A3 (ko) 2010-05-14
EP2289694A4 (de) 2011-05-18

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