US20110068519A1 - Press hardening die cooling device - Google Patents

Press hardening die cooling device Download PDF

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Publication number
US20110068519A1
US20110068519A1 US12/955,854 US95585410A US2011068519A1 US 20110068519 A1 US20110068519 A1 US 20110068519A1 US 95585410 A US95585410 A US 95585410A US 2011068519 A1 US2011068519 A1 US 2011068519A1
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US
United States
Prior art keywords
cooling water
press hardening
die
steel plate
cooling
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.)
Abandoned
Application number
US12/955,854
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English (en)
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
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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
Assigned to HYUNDAI STEEL COMPANY reassignment HYUNDAI STEEL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HONG, SEUNGTAEK, KWON, SOONYONG
Publication of US20110068519A1 publication Critical patent/US20110068519A1/en
Abandoned legal-status Critical Current

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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.
  • 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.
  • 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.
  • FIG. 1 is a view showing the configuration of a first embodiment of a press hardening die cooling device according to the present invention.
  • FIG. 2 is a perspective view showing a second embodiment of the present invention.
  • FIG. 3 is a view showing the configuration of a third embodiment of a press hardening die cooling device according to the present invention.
  • FIG. 4 is a view showing the configuration of a fourth embodiment of a press hardening die cooling device according to the present invention.
  • FIG. 5 is a view showing the configuration of a fifth embodiment of a press hardening die cooling device according to the present invention.
  • FIG. 6 is a view showing the configuration of a sixth embodiment of a press hardening die cooling device according to the present invention.
  • FIG. 7 is a graph showing a cooling process to time of a steel plate blank according to the present invention.
  • 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 T 1 .
  • 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 T 1 , 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° C. which 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 and the contact surface of the steel plate blank S.
  • the holes are formed to change the trimming portions T 1 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 T 1 through the holes 210 such that cooling performance of the cooling water decreases at the portions than the other portions and the trimming portions T 1 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 T 1 .
  • 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 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 T 1 .
  • 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)
US12/955,854 2008-07-25 2010-11-29 Press hardening die cooling device Abandoned US20110068519A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR20080072979 2008-07-25
KR10-2008-0072979 2008-07-25
PCT/KR2009/004133 WO2010011103A2 (ko) 2008-07-25 2009-07-24 프레스 경화용 금형의 냉각장치

Related Parent Applications (1)

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

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US20110068519A1 true US20110068519A1 (en) 2011-03-24

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US12/955,854 Abandoned US20110068519A1 (en) 2008-07-25 2010-11-29 Press hardening die cooling device

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

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US20130180633A1 (en) * 2010-12-27 2013-07-18 Posco Method of Manufacturing Multi Physical Properties Part
US20140091063A1 (en) * 2012-09-28 2014-04-03 Electro-Motive Diesel, Inc. System for hardening a cylindrical metal component
US20140202345A1 (en) * 2011-08-22 2014-07-24 Chris Wood Hot forming press
WO2014163832A1 (en) 2013-03-13 2014-10-09 Magna International Inc. Processing of hot stamped parts
US20150060427A1 (en) * 2013-09-04 2015-03-05 Hyundai Motor Company Blank forming device using electric direct heating and method of manufacturing a blank
CN105537424A (zh) * 2015-12-30 2016-05-04 东莞市豪斯特热冲压技术有限公司 一种用于热冲压模具的并联冷却水路结构
US20180111179A1 (en) * 2016-10-21 2018-04-26 Ford Motor Company Method for monitoring quality of hot stamped components
CN108326159A (zh) * 2018-02-08 2018-07-27 苑世剑 一种大尺寸铝合金拼焊板类构件冷冻成形方法
CN109877231A (zh) * 2019-04-25 2019-06-14 江苏理工学院 一种模具冷却系统及冷却方法
CN110014092A (zh) * 2019-04-25 2019-07-16 江苏理工学院 一种模具冷却系统及清洗方法
US10625323B2 (en) 2016-02-19 2020-04-21 Ford Global Technologies, Llc Method for monitoring quality of hot stamped components
CN112453096A (zh) * 2020-10-10 2021-03-09 重庆至信实业集团有限公司 不等厚片材的加工工艺及其设备
CN114015843A (zh) * 2021-11-05 2022-02-08 安徽理工大学 一种间接热成型冲压装置

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KR101387332B1 (ko) 2012-05-10 2014-04-21 (주)포스코 급속 냉각 기능을 갖는 핫프레스포밍용 금형 및 이러한 금형의 냉각방법
CN102672054B (zh) * 2012-05-30 2015-04-01 浙江吉利汽车研究院有限公司杭州分公司 热成形方法及热成形模具
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
CN104357629A (zh) * 2014-11-12 2015-02-18 天津市热处理研究所有限公司 工件热处理用淬火模具
PL3072980T3 (pl) 2015-03-26 2018-07-31 Weba Werkzeugbau Betriebs Gmbh Sposób oraz urządzenie do wytwarzania kształtki częściowo hartowanej
JP6970163B2 (ja) * 2015-03-31 2021-11-24 住友重機械工業株式会社 成形装置
CN105344841A (zh) * 2015-10-30 2016-02-24 鹰普（中国）有限公司 一种加热整形方法
JP7390153B2 (ja) * 2019-10-08 2023-12-01 大同プラント工業株式会社 クエンチ処理設備及びクエンチ処理方法
JP7320422B2 (ja) * 2019-10-08 2023-08-03 大同プラント工業株式会社 オーステンパー処理設備及びオーステンパー処理方法
CN113290150B (zh) * 2021-04-30 2024-03-15 合肥合锻智能制造股份有限公司 可拆式温度可控热压组合模具

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9394578B2 (en) * 2010-12-27 2016-07-19 Posco Method of manufacturing multi physical properties part
US20130180633A1 (en) * 2010-12-27 2013-07-18 Posco Method of Manufacturing Multi Physical Properties Part
US20140202345A1 (en) * 2011-08-22 2014-07-24 Chris Wood Hot forming press
US20140091063A1 (en) * 2012-09-28 2014-04-03 Electro-Motive Diesel, Inc. System for hardening a cylindrical metal component
US10457997B2 (en) 2013-03-13 2019-10-29 Magna International Inc. Processing of hot stamped parts
WO2014163832A1 (en) 2013-03-13 2014-10-09 Magna International Inc. Processing of hot stamped parts
CN105283564A (zh) * 2013-03-13 2016-01-27 麦格纳国际公司 热冲压部件的加工
US20160024608A1 (en) * 2013-03-13 2016-01-28 Jaswinder Pal Singh Processing of hot stamped parts
EP2971193A4 (en) * 2013-03-13 2016-05-04 Magna Int Inc PROCESSING OF HOT PANELS
US20150060427A1 (en) * 2013-09-04 2015-03-05 Hyundai Motor Company Blank forming device using electric direct heating and method of manufacturing a blank
CN105537424A (zh) * 2015-12-30 2016-05-04 东莞市豪斯特热冲压技术有限公司 一种用于热冲压模具的并联冷却水路结构
US10625323B2 (en) 2016-02-19 2020-04-21 Ford Global Technologies, Llc Method for monitoring quality of hot stamped components
US11554404B2 (en) 2016-02-19 2023-01-17 Ford Global Technologies, Llc Method for monitoring quality of hot stamped components
US20180111179A1 (en) * 2016-10-21 2018-04-26 Ford Motor Company Method for monitoring quality of hot stamped components
US11229935B2 (en) * 2016-10-21 2022-01-25 Ford Global Technologies, Llc Method for monitoring quality of hot stamped components
CN108326159A (zh) * 2018-02-08 2018-07-27 苑世剑 一种大尺寸铝合金拼焊板类构件冷冻成形方法
CN109877231A (zh) * 2019-04-25 2019-06-14 江苏理工学院 一种模具冷却系统及冷却方法
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CN112453096A (zh) * 2020-10-10 2021-03-09 重庆至信实业集团有限公司 不等厚片材的加工工艺及其设备
CN114015843A (zh) * 2021-11-05 2022-02-08 安徽理工大学 一种间接热成型冲压装置

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EP2289694B1 (en) 2013-01-09
EP2289694A4 (en) 2011-05-18
WO2010011103A2 (ko) 2010-01-28
WO2010011103A3 (ko) 2010-05-14
JP2011523375A (ja) 2011-08-11
EP2289694A2 (en) 2011-03-02
KR20100011958A (ko) 2010-02-03
JP5403768B2 (ja) 2014-01-29

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