EP2754723A2 - Procédé pour produire une pièce formée à chaud et pièce ainsi formée - Google Patents
Procédé pour produire une pièce formée à chaud et pièce ainsi formée Download PDFInfo
- Publication number
- EP2754723A2 EP2754723A2 EP14163594.6A EP14163594A EP2754723A2 EP 2754723 A2 EP2754723 A2 EP 2754723A2 EP 14163594 A EP14163594 A EP 14163594A EP 2754723 A2 EP2754723 A2 EP 2754723A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- blank
- hot forming
- temperature
- forming press
- heated
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000011247 coating layer Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000010791 quenching Methods 0.000 claims abstract description 3
- 230000000171 quenching effect Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 37
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000011344 liquid material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
Definitions
- the invention relates to a method for manufacturing a coated steel part having very high mechanical properties using hot forming techniques, and a part thus formed.
- micro-cracks is strongly influenced by the temperature of the blank when it is placed in the hot forming press and the temperature at which the hot formed part is formed in the hot forming press.
- high temperatures such as used in the art, many micro-cracks are formed in the substrate, which often have a depth of more than 10 ⁇ m.
- Lowering the temperature at which the coated blank is placed in the hot forming press reduced the micro-cracks in number and depth. It has been found that cooling the heated blank to a temperature of at most 780° C when placed in the hot forming press already reduces the number and depth of the micro-cracks to a considerable extent.
- the blank is heated to a temperature of 850° C or more, more preferably a temperature of 880° C or more, and still more preferably to a temperature of 900° C or more.
- the coated blank is heated to a temperature such that the substrate is fully and homogenously austenitised before it is placed in the hot forming press.
- the heated blank has a temperature of at least 500° C when placed in the hot forming press, more preferably a temperature of at least 600° C, and still more preferably a temperature of at least 650° C.
- the temperature of the blank can be below the Arl temperature when placed into the blank, but preferably the blank is not cooled too far because the cooling rate is very critical at low temperatures.
- the heated blank has a temperature of at most 740° C when placed in the hot forming press, and more preferably a temperature of at most 700° C.
- the temperature of the blank should be as low as possible to prevent (large) micro-cracks. Thus, it is optimal if the temperature of the blank is between 650° C and 700° C when the blank is placed in the hot forming press.
- the heated steel blank is transported between the furnace and the hot forming press in a time span of at most 10 seconds, more preferably in a time span of at most 8 seconds, and still more preferably in a time span of at most 6 seconds.
- a short transportation time is also advantageous to reduce the cycle time to produce a hot formed part.
- the heated blank is cooled between the furnace and the hot forming press using accelerated cooling making use of gas, such as cooling with forced air flow, cooling with forced N 2 flow, or cooling with forced CO 2 flow or cooled CO 2 using solid CO 2 .
- gas such as cooling with forced air flow, cooling with forced N 2 flow, or cooling with forced CO 2 flow or cooled CO 2 using solid CO 2 .
- the heated blank is cooled between the furnace and the hot forming press using liquid or solid material, such as liquid or solid CO 2 particles or metal cooling plates.
- liquid or solid material such as liquid or solid CO 2 particles or metal cooling plates.
- Solid CO 2 particles for instance have the advantage of a fast cooling capacity and the additional advantage that oxide layers on the coating are at least partially removed at the same time, but solid CO 2 particles are more difficult to supply at the right time period.
- Metal cooling plates that are brought into contact with the heated blank provide a very fast cooling rate, but a tight control of the cooling time is required.
- the zinc alloy consists of 0.3 - 4.0% Mg and 0.05 - 6.0% Al, optionally at most 0.2% of one or more additional elements, unavoidable impurities, the remainder being zinc. It has been found that such a zinc alloy provides a better corrosion resistance to the hot formed part.
- the zinc or zinc alloy layer is pre-diffused in the substrate.
- the pre-diffused coating makes it possible to heat the blank fast to a temperature above the Ac3 temperature.
- the zinc or zinc alloy coated steel blank contains an average of 10 - 75 % iron in the coating after heating the blank in the furnace, preferably an average of 25 - 55 %. This amount of iron in the coating ensures that the (initial) zinc or zinc alloy coating does not evaporate at temperatures above the Ac3 temperature.
- the hot forming press is internally cooled such that the blank is cooled with a cooling velocity of at least 50° C/sec during the first second after the press is fully closed, preferably with a cooling velocity of at least 100° C/sec during the first second.
- This very fast cooling rate after the hot forming press is fully closed makes that the austenitic structure of the heated blank is transformed fully or almost fully to a martensitic structure.
- the hot forming press is fully closed in at most one second. This fast closing of the hot forming press is advantageous so as to fast cool also the portions of the blank that are not in immediate contact with the press.
- a hot formed part manufactured according to the above method, wherein the substrate of the part is free of micro-cracks having a depth of more than 15 ⁇ m, and preferably the substrate is free of micro-cracks having a depth of more than 10 ⁇ m. Parts having less deep micro-cracks are preferred over parts having deeper micro-cracks.
- a hot formed part manufactured according to the above method, wherein the micro-cracks in the substrate have an average depth of at most 3 ⁇ m in five surface area's of the blank with a size of 1 cm 2 . Parts having on average shallow micro-cracks are preferred over parts having deep micro-cracks on average.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14163594.6A EP2754723A3 (fr) | 2011-01-17 | 2012-01-17 | Procédé pour produire une pièce formée à chaud et pièce ainsi formée |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11000315 | 2011-01-17 | ||
EP12700452.1A EP2665837A1 (fr) | 2011-01-17 | 2012-01-17 | Procédé de fabrication d'une pièce façonnée à chaud et pièce ainsi façonnée |
EP14163594.6A EP2754723A3 (fr) | 2011-01-17 | 2012-01-17 | Procédé pour produire une pièce formée à chaud et pièce ainsi formée |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12700452.1A Division EP2665837A1 (fr) | 2011-01-17 | 2012-01-17 | Procédé de fabrication d'une pièce façonnée à chaud et pièce ainsi façonnée |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2754723A2 true EP2754723A2 (fr) | 2014-07-16 |
EP2754723A3 EP2754723A3 (fr) | 2016-08-31 |
Family
ID=44003816
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14163594.6A Ceased EP2754723A3 (fr) | 2011-01-17 | 2012-01-17 | Procédé pour produire une pièce formée à chaud et pièce ainsi formée |
EP12700452.1A Ceased EP2665837A1 (fr) | 2011-01-17 | 2012-01-17 | Procédé de fabrication d'une pièce façonnée à chaud et pièce ainsi façonnée |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12700452.1A Ceased EP2665837A1 (fr) | 2011-01-17 | 2012-01-17 | Procédé de fabrication d'une pièce façonnée à chaud et pièce ainsi façonnée |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2754723A3 (fr) |
CN (1) | CN103403195B (fr) |
WO (1) | WO2012097976A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3201368A1 (fr) * | 2014-10-02 | 2017-08-09 | Voestalpine Stahl GmbH | Procédé de refroidissement intermédiaire de tôle en acier |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201116668D0 (en) * | 2011-09-27 | 2011-11-09 | Imp Innovations Ltd | A method of forming parts from sheet steel |
EP3122486A1 (fr) * | 2014-03-28 | 2017-02-01 | Tata Steel IJmuiden BV | Procédé de formage à chaud d'une pièce brute d'acier enduit |
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 |
DE102015001408A1 (de) * | 2015-02-06 | 2016-08-11 | Eisenmann Se | Anlage zum Formhärten von Werkstücken |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005003551A1 (de) | 2005-01-26 | 2006-07-27 | Volkswagen Ag | Verfahren zur Warmumformung und Härtung eines Stahlblechs |
US20070130772A1 (en) | 2004-02-06 | 2007-06-14 | Fes Gmbh Fahrzeug-Entwicklung Sachsen | Method for producing a three-dimensionally formed armoring component for motor vehicle bodies |
JP2007182608A (ja) | 2006-01-06 | 2007-07-19 | Nippon Steel Corp | 耐食性、耐疲労性に優れた高強度焼き入れ成形体の製造方法および製造設備 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4506128B2 (ja) * | 2003-08-29 | 2010-07-21 | 住友金属工業株式会社 | 熱間プレス成形品およびその製造方法 |
DE102004038626B3 (de) | 2004-08-09 | 2006-02-02 | Voestalpine Motion Gmbh | Verfahren zum Herstellen von gehärteten Bauteilen aus Stahlblech |
DE102006019395A1 (de) | 2006-04-24 | 2007-10-25 | Thyssenkrupp Steel Ag | Vorrichtung und Verfahren zum Umformen von Platinen aus höher- und höchstfesten Stählen |
DE102008039264A1 (de) | 2008-08-22 | 2010-03-04 | Schuler Cartec Gmbh & Co. Kg | Verfahren zum Formhärten mit Zwischenkühlung |
JP4825882B2 (ja) * | 2009-02-03 | 2011-11-30 | トヨタ自動車株式会社 | 高強度焼き入れ成形体及びその製造方法 |
DE102009050533A1 (de) | 2009-10-23 | 2011-04-28 | Thyssenkrupp Sofedit S.A.S | Verfahren und Warmumformanlage zur Herstellung eines gehärteten, warm umgeformten Werkstücks |
EP2623226A4 (fr) | 2010-09-30 | 2017-11-01 | Kabushiki Kaisha Kobe Seiko Sho | Article moulé à la presse et son procédé de production |
-
2012
- 2012-01-17 CN CN201280005548.4A patent/CN103403195B/zh active Active
- 2012-01-17 EP EP14163594.6A patent/EP2754723A3/fr not_active Ceased
- 2012-01-17 EP EP12700452.1A patent/EP2665837A1/fr not_active Ceased
- 2012-01-17 WO PCT/EP2012/000186 patent/WO2012097976A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070130772A1 (en) | 2004-02-06 | 2007-06-14 | Fes Gmbh Fahrzeug-Entwicklung Sachsen | Method for producing a three-dimensionally formed armoring component for motor vehicle bodies |
DE102005003551A1 (de) | 2005-01-26 | 2006-07-27 | Volkswagen Ag | Verfahren zur Warmumformung und Härtung eines Stahlblechs |
JP2007182608A (ja) | 2006-01-06 | 2007-07-19 | Nippon Steel Corp | 耐食性、耐疲労性に優れた高強度焼き入れ成形体の製造方法および製造設備 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3201368A1 (fr) * | 2014-10-02 | 2017-08-09 | Voestalpine Stahl GmbH | Procédé de refroidissement intermédiaire de tôle en acier |
Also Published As
Publication number | Publication date |
---|---|
CN103403195B (zh) | 2016-05-04 |
WO2012097976A1 (fr) | 2012-07-26 |
CN103403195A (zh) | 2013-11-20 |
EP2665837A1 (fr) | 2013-11-27 |
EP2754723A3 (fr) | 2016-08-31 |
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