WO2006109490A1 - 熱間成形鋼製品の製造方法 - Google Patents
熱間成形鋼製品の製造方法 Download PDFInfo
- Publication number
- WO2006109490A1 WO2006109490A1 PCT/JP2006/305829 JP2006305829W WO2006109490A1 WO 2006109490 A1 WO2006109490 A1 WO 2006109490A1 JP 2006305829 W JP2006305829 W JP 2006305829W WO 2006109490 A1 WO2006109490 A1 WO 2006109490A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- hot
- temperature
- steel
- forming
- Prior art date
Links
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Definitions
- the present invention heats a steel sheet (blank) as a material after heating it to austenite + ferrite temperature (Ac transformation point) or higher.
- the present invention relates to a method of manufacturing a molded product by press molding in addition to a molded product formed of such a steel sheet, and in particular, a manufacturing that can realize good forming without causing breakage or cracking during press molding.
- the present invention relates to a method and a molded product. Background art
- Patent Document 1 proposes a technique of forming a metal material using a relatively low-temperature press die in a state where the metal material is heated to 850 to 1050 ° C. According to this technology, it is said that the moldability of the metal material becomes better and the occurrence of delayed fracture due to residual stress can be prevented. In particular, it is possible to obtain a part that has strength equivalent to that of a high-strength steel sheet with a tensile strength of 1470 MPa, which was difficult to form by the usual cold pressing method, and good dimensional accuracy. Become.
- FIG. 1 is a schematic explanatory view showing a mold configuration for carrying out hot forming as described above (hereinafter sometimes referred to as “hot stamp”), in which 1 is a punch, 2 Is the die, 3 is the blank holder (wrinkle presser), 4 is the steel plate (blank), BHF is the wrinkle presser force, rp is the punch shoulder radius, rd is the die shoulder radius, and CL is the clearance between the punch Z die.
- the punch 1 and the die 2 are formed with passages la and 2a through which a cooling medium (for example, water) can pass, respectively. These members are configured to be cooled by passing them.
- a cooling medium for example, water
- the steel plate 4 is pushed into the hole of the die 2 by the punch 1, and the shape corresponding to the outer shape of the punch 1 is reduced while reducing the outer diameter of the blank.
- the material is quenched by holding and cooling at the bottom dead center.
- Patent Document 4 It has also been proposed to perform press molding by heating to such a temperature (for example, Patent Document 4). However, the inventor has found that the drawability tends to be further deteriorated if molding is performed after heating to the above temperature range (Non-patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-102980
- Patent Document 2 Japanese Patent Laid-Open No. 2004-124221 Patent Claim etc.
- Patent Document 3 Japanese Patent Application Laid-Open No. 2004-315927 Patent Claim etc.
- Patent Document 4 Japanese Patent Application Laid-Open No. 2003-126920 Patent claim, paragraph number [0041], [0
- Non-Patent Document 1 "Hot Stamping Drawability of SteelJ (Proceedings IDDRG) 2004.P344 Invention Disclosure
- the present invention has been made under such circumstances, and an object of the present invention is to realize good forming without forming breakage or cracking during forming when forming a steel sheet hot. It is an object of the present invention to provide a useful method for producing a hot-formed steel product, and a hot-formed product formed by the steel plate.
- the method for producing a hot-formed steel product of the present invention that has achieved the above object is a steel plate used for producing a molded product by hot forming a steel plate, and heating the steel plate After the austenitization, the steel sheet is cooled to an average cooling rate of 20 ° CZ seconds or more to a temperature range below the martensite transformation start temperature Ms, and the steel sheet after cooling is hot-formed. .
- the steel sheet obtained by the heat treatment has excellent formability (particularly drawability). Moreover, a hot-formed product with good quality can be obtained by heating the steel sheet to a temperature equal to or higher than the Ac transformation point and then forming it hot.
- the steel sheet after heating the steel sheet to austenite, the steel sheet is preliminarily given a thermal history of cooling at a mean cooling rate of 20 ° CZ seconds or more to a temperature range of the martensite transformation start temperature Ms or less.
- a thermal history of cooling at a mean cooling rate of 20 ° CZ seconds or more to a temperature range of the martensite transformation start temperature Ms or less.
- FIG. 1 is a schematic explanatory view showing a mold configuration for carrying out hot forming.
- FIG. 2 is a schematic explanatory diagram showing the configuration of a previously developed mold.
- FIG. 3 is a drawing substitute photograph showing the structure of various steel plates.
- FIG. 4 A bar graph showing the results of the maximum forming load and the presence / absence of cracks when a test piece is formed.
- FIG. 5 is a perspective view schematically showing the external shape of a molded product that can be molded.
- FIG. 6 is a perspective view schematically showing the external shape when a crack occurs.
- the present inventor has been researching technology that can realize good press formability, and as part of that research, has proposed a technology for drawing with the mold shown in FIG. (JP 2005-14002).
- a pin 7 for supporting a steel plate is provided on a part of the blank holder 3, and the steel plate 4 is placed on the pin 7, so that the steel plate is placed on the die 2 and the blank holder 3.
- Fig. 2 is basically the same as Fig. 1).
- the upper surface of the pin 7 is flush with the upper surface of the blank holder, and the steel plate 4 is placed on the blank holder 3.
- the steel plate 4 is supported by the pin 7 before forming, and the steel plate 4 and the die (particularly the die 2 and the blank holder 3) are directly connected.
- the steel plate 4 and the die are directly connected.
- the upper surface portion of the punch 1 and most of the other portions are cooled almost simultaneously, and due to the temperature non-uniformity of the steel plate 4, the material strength on the punch surface is reduced on the flange surface. It is possible to prevent the material strength of the material from becoming relatively low. As a result, breakage, particularly on the punch surface, is prevented and drawability is improved.
- the present inventor has made sure that an oxide scale having a predetermined thickness exists on the surface of the steel sheet. For example, it has been found that the drawability is improved. In other words, in conventional hot forming, heating is performed in a non-oxidizing atmosphere and is formed on the blank surface from the viewpoint of preventing acidity on the blank surface in consideration of post-processing after molding.
- the oxide scale was considered to be as thin as possible (for example, 10 m or less).
- the present inventor has repeatedly studied to improve the deformability of the raw steel plate itself from the viewpoint of the structure. As a result, it was found that the moldability was good and the drawing could be easily performed, and the present invention was completed.
- the steel sheet used in the hot-formed steel product of the present invention is a steel sheet heated (temperature above the Ac transformation point).
- the steel sheet After austenitic, the steel sheet is obtained by cooling it to a temperature range below the martensitic transformation start temperature Ms at an average cooling rate of 20 ° CZ seconds or more.
- the hot formability is further improved.
- the reason why the temperature is not lower than the 3 transformation point (austenite temperature) is to dissolve the carbides in the steel sheet in the austenite. Cooling at an average cooling rate of 20 ° CZ seconds (hereinafter referred to as ⁇ ° CZs '') or higher until the martensite transformation start temperature Ms or lower after heating is as uniform as possible in the microstructure of the steel sheet obtained by this series of cooling. Necessary for forming a martensite structure.If the average cooling rate is less than 20 ° CZ s, the amount of ferrite structure, bainite structure, etc. in the martensite structure after cooling increases. I cannot expect improvement. Therefore, an average cooling rate of 50 ° CZs or higher is preferred.
- the steel sheet that has been given a heat history exhibits a microstructure lath structure during forming when heated to a two-phase region. This also contributes to a reduction in the molding load and an improvement in the fracture limit, and is thought to further improve the moldability.
- FIG. 3 shows the structure of various steel sheets (the steel sheet of the present invention) given the thermal history
- FIG. 3 (b) shows the structure of the steel sheet (conventional steel sheet) without giving the thermal history.
- the white portion is martensite, blackish portion and the partial force S ferrite, but it can be seen that the structure of the steel sheet used in the present invention is a lath structure.
- the cooling time is preferably within 20 seconds.
- the effect of the manufacturing method of the present invention is remarkably exhibited when molding (ie, drawing) using a mold having a wrinkle retainer. It is also useful to use the technology proposed in the above. In other words, the steel mold adopting the mold configuration shown in FIG. It is also useful to achieve temperature uniformity of the plate and press forming using a steel plate with an oxide scale of 15 m or more on the surface. By using these techniques together, the effects of the present invention can be exhibited more effectively. Will be.
- the molded product according to the present invention is not limited to a drawn product formed using a crease presser, but also includes a product obtained by ordinary press molding. Even in the case of manufacturing such a molded article, the effect of the manufacturing method of the present invention is achieved.
- the chemical component composition of the steel sheet used in the present invention is not particularly limited, and may be a steel sheet normally used in hot pressing. Desirably, C:. 0. 10-0 35% ( mean mass 0/0, the same below), Mn: 2% or less, Si:. 0. 1 ⁇ 3 0% , A1: 0. 01 ⁇ 0.
- a steel having the chemical composition shown in Table 1 below was rolled and annealed to a thickness of 1.4 mm by ordinary means. From this, a circular blank with a diameter (blank diameter) of 95 mm was used for the punching experiment (Ac transformation point of this blank: 725 ° C, Ac transformation point: 850 ° C, Ms point: 450 ° C).
- Specimen A The above-mentioned circular blank is not heat-treated (the above-mentioned rolled and annealed material: conventional material)
- Specimen B Heated to 900 ° C and austenitic, then water cooled (average cooling rate: 20 ° CZs) cooled to 300 ° C (Invention material)
- Specimen C Heated to a temperature of 900 to austenite, then cooled by forced air cooling (average cooling rate: 10 ° C / s) to 300 ° C (comparative material)
- each circular blank after heat treatment for test pieces 8 to
- a die square tube die and square tube punch
- a square punch head shape one side of 45 mm
- the blank was heated in an air atmosphere using an electric furnace, and the heating temperature was set to 770 ° C or 810 ° C.
- the thickness of the oxide scale generated during heating was unified to about 20 m.
- the molding speed was set at 40 times Z for the crank rotation speed.
- the molding start temperature was controlled by changing the time from when the heating furnace power blank was taken out and molding was started (cooling time). At this time, the molding start temperature was estimated by measuring the natural cooling curve of the blank in advance and allowing it to cool (5 seconds or 10 seconds) until the start of molding. In the molding process, after the molding started, it was held at the bottom dead center for about 20 seconds, and a quenching operation was performed.
- Other press molding conditions are as follows.
- Lubricant Acidic Ca-based pasty solid lubricant was used and applied to the mold.
- the “X” mark means that cracking occurred during molding.
- the white ones are the results when the heating temperature is 770 ° C, and the shaded ones are the results when the heating temperature is 810 ° C.
- the molding start temperature (estimated temperature) of the one with a heating temperature of 770 ° C is 725 ° C (cooling for 5 seconds) and 680 ° C (cooling for 10 seconds), and the heating temperature is 810 ° Molding start temperature for C is 755 ° C
- the method of the present invention (using test piece B) has a lower maximum molding load, and the desired molded product without cracking can be obtained. It is powerful to be. On the other hand, the specimens A and C show that the maximum molding load is large and cracking is likely to occur.
- FIG. 5 schematically shows the appearance of the molded product obtained as described above (with cracks generated! /, Etc.).
- Figure 6 schematically shows the appearance of the cracks.
- the maximum forming load tended to increase as the cooling time increased. This was because the strength of the steel sheet increased and the deformation resistance increased. I was able to think.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800026908A CN101107369B (zh) | 2005-03-31 | 2006-03-23 | 热成形钢制品的制造方法 |
US11/908,412 US20090007999A1 (en) | 2005-03-31 | 2006-03-23 | Method for manufacturing hot-formed steel product |
GB0718181A GB2437955B (en) | 2005-03-31 | 2006-03-23 | Method of manufacturing hot-formed steel product |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-101671 | 2005-03-31 | ||
JP2005101671A JP3816937B1 (ja) | 2005-03-31 | 2005-03-31 | 熱間成形品用鋼板およびその製造方法並びに熱間成形品 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006109490A1 true WO2006109490A1 (ja) | 2006-10-19 |
Family
ID=36991067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/305829 WO2006109490A1 (ja) | 2005-03-31 | 2006-03-23 | 熱間成形鋼製品の製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090007999A1 (ja) |
JP (1) | JP3816937B1 (ja) |
KR (1) | KR100961022B1 (ja) |
CN (1) | CN101107369B (ja) |
GB (1) | GB2437955B (ja) |
WO (1) | WO2006109490A1 (ja) |
Cited By (2)
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EP2175041A1 (en) * | 2008-10-09 | 2010-04-14 | C.R.F. Società Consortile per Azioni | Method of hot forming metal plates |
CN103140305A (zh) * | 2010-09-30 | 2013-06-05 | 株式会社神户制钢所 | 冲压成形品的制造方法 |
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DE102010003997A1 (de) * | 2010-01-04 | 2011-07-07 | Benteler Automobiltechnik GmbH, 33102 | Verwendung einer Stahllegierung |
MX345568B (es) | 2010-02-26 | 2017-01-30 | Nippon Steel & Sumitomo Metal Corp * | Material de acero tratado termicamente, metodo para producir el mismo, y material de acero base para el mismo. |
CN101805821B (zh) * | 2010-04-17 | 2012-03-21 | 上海交通大学 | 钢材冲压成形一体化处理方法 |
JP5740099B2 (ja) * | 2010-04-23 | 2015-06-24 | 東プレ株式会社 | 熱間プレス製品の製造方法 |
EP2623226A4 (en) | 2010-09-30 | 2017-11-01 | Kabushiki Kaisha Kobe Seiko Sho | Press-molded article and method for producing same |
KR101277864B1 (ko) * | 2011-03-31 | 2013-06-21 | 주식회사 포스코 | 열간 성형용 블랭크 열처리 장치 및 열간 성형품 제조방법 |
ES2577077T3 (es) | 2011-07-21 | 2016-07-12 | Kabushiki Kaisha Kobe Seiko Sho | Método para producir un elemento de acero moldeado por presión en caliente |
US20140312024A1 (en) * | 2011-12-09 | 2014-10-23 | Toyota Jidosha Kabushiki Kaisha | Method for producing steel sheet for press molding, and method and device for producing press-molded component |
WO2013118862A1 (ja) * | 2012-02-10 | 2013-08-15 | 株式会社神戸製鋼所 | プレス成形品およびその製造方法 |
JP5890710B2 (ja) * | 2012-03-15 | 2016-03-22 | 株式会社神戸製鋼所 | 熱間プレス成形品およびその製造方法 |
ES2578359T3 (es) * | 2012-03-30 | 2016-07-26 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Método para fabricar un elemento de acero formado en una prensa caliente y el elemento de acero formado en la prensa caliente |
DE102012006941B4 (de) * | 2012-03-30 | 2013-10-17 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines Bauteils aus Stahl durch Warmumformen |
US20160222485A1 (en) * | 2013-09-10 | 2016-08-04 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Hot-pressing steel plate, press-molded article, and method for manufacturing press-molded article |
US20160244855A1 (en) * | 2013-10-21 | 2016-08-25 | Edward K. Steinebach | Method For Trimming A Hot Formed Part |
CN103521625B (zh) * | 2013-10-31 | 2016-03-30 | 无锡市金杨新型电源有限公司 | 一种拉伸模具 |
JP5825413B1 (ja) * | 2014-04-23 | 2015-12-02 | Jfeスチール株式会社 | 熱間プレス成形品の製造方法 |
JP6152836B2 (ja) * | 2014-09-25 | 2017-06-28 | Jfeスチール株式会社 | 熱間プレス成形品の製造方法 |
KR102036062B1 (ko) * | 2015-04-28 | 2019-10-24 | 닛폰세이테츠 가부시키가이샤 | 프레스 가공 장치 및 프레스 가공 방법 |
WO2018134874A1 (ja) * | 2017-01-17 | 2018-07-26 | 新日鐵住金株式会社 | ホットスタンプ成形体及びその製造方法 |
KR102394629B1 (ko) * | 2017-12-07 | 2022-05-06 | 현대자동차주식회사 | 핫스탬핑 강판의 접합방법 |
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2005
- 2005-03-31 JP JP2005101671A patent/JP3816937B1/ja active Active
-
2006
- 2006-03-23 WO PCT/JP2006/305829 patent/WO2006109490A1/ja active Application Filing
- 2006-03-23 KR KR1020077021520A patent/KR100961022B1/ko active IP Right Grant
- 2006-03-23 GB GB0718181A patent/GB2437955B/en not_active Expired - Fee Related
- 2006-03-23 CN CN2006800026908A patent/CN101107369B/zh active Active
- 2006-03-23 US US11/908,412 patent/US20090007999A1/en not_active Abandoned
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JP2002102980A (ja) * | 2000-07-28 | 2002-04-09 | Aisin Takaoka Ltd | 車輌用衝突補強材の製造方法および車輌用衝突補強材 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2175041A1 (en) * | 2008-10-09 | 2010-04-14 | C.R.F. Società Consortile per Azioni | Method of hot forming metal plates |
CN103140305A (zh) * | 2010-09-30 | 2013-06-05 | 株式会社神户制钢所 | 冲压成形品的制造方法 |
CN103140305B (zh) * | 2010-09-30 | 2015-06-17 | 株式会社神户制钢所 | 冲压成形品的制造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101107369B (zh) | 2013-09-11 |
CN101107369A (zh) | 2008-01-16 |
KR100961022B1 (ko) | 2010-06-01 |
US20090007999A1 (en) | 2009-01-08 |
GB2437955A (en) | 2007-11-14 |
KR20070108912A (ko) | 2007-11-13 |
JP3816937B1 (ja) | 2006-08-30 |
GB0718181D0 (en) | 2007-10-31 |
JP2006283064A (ja) | 2006-10-19 |
GB2437955B (en) | 2010-06-16 |
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