EP1983063A2 - Procédé de moulage et de durcissement d'une pièce à usiner en acier dans une presse à estamper - Google Patents

Procédé de moulage et de durcissement d'une pièce à usiner en acier dans une presse à estamper Download PDF

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Publication number
EP1983063A2
EP1983063A2 EP08005252A EP08005252A EP1983063A2 EP 1983063 A2 EP1983063 A2 EP 1983063A2 EP 08005252 A EP08005252 A EP 08005252A EP 08005252 A EP08005252 A EP 08005252A EP 1983063 A2 EP1983063 A2 EP 1983063A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
coolant
dies
forming tool
tool
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.)
Granted
Application number
EP08005252A
Other languages
German (de)
English (en)
Other versions
EP1983063A3 (fr
EP1983063B1 (fr
Inventor
Markus Müller
Hans-Jürgen Knaup
Udo Klasfauseweh
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.)
Benteler Defense GmbH and Co KG
Original Assignee
Benteler Automobiltechnik GmbH
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 Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP1983063A2 publication Critical patent/EP1983063A2/fr
Priority to RU2010148542/05A priority Critical patent/RU2481888C2/ru
Publication of EP1983063A3 publication Critical patent/EP1983063A3/fr
Application granted granted Critical
Publication of EP1983063B1 publication Critical patent/EP1983063B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C21D9/42—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for armour plate
    • 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
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • C21D1/63—Quenching devices for bath 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
    • C21D1/62—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

Definitions

  • the invention relates to a method for compression molding and hardening of a workpiece made of steel in a stamping press with the measures in the preamble of patent claim 1.
  • the cooling rate of the workpiece must be greater than the critical material-specific cooling rate.
  • the workpiece must also be cooled to a temperature below the martensite start temperature. In this way, a diffusion-free folding of the austenitic structure of the workpiece is achieved in a martensitic microstructure, wherein the martensitic microstructure is characterized by high hardness and high tensile strength. A certain proportion of retained austenite remains, but it is harmless in small quantities.
  • An improvement in cooling could theoretically be achieved by bringing the cooling liquid into direct contact with the workpiece.
  • a method is used, for example, in DE 26 03 618 A described.
  • a Abschreckpresse is described, which has a mold cavity which corresponds to the desired final shape of the workpiece. Inlets are provided in the mold cavity, through which cooling liquid flows into the mold cavity to rapidly cool and quench the workpiece fixed there between the mold halves. After quenching, the workpiece is removed again from the forming tool. The workpiece remains at least partially in contact with the workpiece during the quenching process, since it is considered another object of the quenching press to secure the article against deformation and to rigidly hold it.
  • Very elaborate forming tools are also used in this procedure, wherein a smaller area of the tool surface is in contact with the workpiece due to the multiplicity of grooves in the forming tools. But this also leads to premature tool wear, due to the forming forces, especially when it comes to very thick-walled components.
  • the invention is based on the object to provide a method which is used for press forming and hardening of steel workpieces and in particular for the production of armor components for Vehicle bodies is suitable, with the method using simple and inexpensive design molds molded and hardened components of complex geometry and uniform hardness distribution can be made.
  • the method is intended to produce workpieces with reproducible precision and with significantly smaller dimensional tolerances than comparable weldments.
  • the invention is based on the essential finding that critical cooling rates can be achieved only with great effort by the tool contact in thick-walled components with wall thicknesses between 5 and 20 mm, especially when dealing with complex three-dimensional geometries.
  • the resulting from the tool contact fluctuations in hardness and tensile strength due to falling below the critical cooling rate, can be prevented in the context of the invention that the cooling is not exclusively by heat dissipation via the tool or via the closed tool initiated coolant, but that the tool or the upper die and the lower die are partially moved apart after the hot working of the workpiece to allow the access of coolant in the gap formed by the moving apart between the dies and the workpiece.
  • the forming tool is closed again after the molds have been moved apart and after quenching by introducing coolant into the gap, so that the workpiece is pressed once more in the same forming tool.
  • the workpiece is once again in contact with the upper die and the lower die.
  • the workpiece is thereby directed, whereby a high dimensional accuracy of the workpieces produced in this process can be ensured.
  • the moving apart of the dies for quenching and the subsequent pressing with intermediate cooling of the workpiece can be repeated several times before the reshaped and hardened workpiece is finally removed from the forming tool and is supplied for further use.
  • the workpiece can be subjected to further heat treatments, for example.
  • the introduction of coolant into the coolant gap can be realized in different ways.
  • the heated workpiece above a coolant level can be inserted into the mold cavity.
  • the lower die is to some extent in a filled with the liquid coolant pan.
  • the coolant preferably flows simultaneously from all sides into the gap between the upper die and lower die that arises when moving apart.
  • the lower die can also be lowered relative to the coolant level. In practice, however, it is easier to raise the coolant level. This can be done, for example, by displacement elements, which dip into the coolant when the upper die is lowered.
  • the coolant is especially water, which is provided with a lubricant additive.
  • a lubricant additive such as graphite or a graphite-free, water-miscible die lubricant, supports the forming of the workpiece in the die press and helps to reduce tool wear.
  • three-dimensionally shaped armor components can be produced with the method according to the invention.
  • the gradient of the cooling ie the cooling rate of the workpiece, can be set very precisely via the properties of the coolant and in particular via the process of the tool opening and the holding times in the workpiece.
  • Complex tool geometries may require that drain holes be provided in the lower die to avoid liquid pockets that would interfere with repeated closing movements of the forming tool.
  • FIG. 1 is greatly simplified to recognize a forming tool 1 a not shown pressing press.
  • the forming tool 1 consists of an upper die 2 and a lower die 3.
  • the upper die 2 may be referred to as an upper tool and the lower die as a lower tool.
  • a workpiece 4 in the form of a board made of a hardenable steel. From this flat board three-dimensionally shaped armor components for motor vehicles are to be produced.
  • the board or the workpiece 4 has a large wall thickness of several millimeters.
  • FIG. 1 is the forming tool 1 in the open state.
  • the lower die 3 is surrounded by a coolant trough 5, in which a coolant 6 is located. It is water with a lubricant additive.
  • the coolant 6 is continuously cooled in a process, not shown.
  • the upper die 2 is linearly displaceable with respect to the lower die 3. Furthermore, adjacent to the upper die 2 displacement bodies 7 can be seen, which can dip into the coolant 6.
  • the workpiece 4 Before inserting the workpiece 4 into the forming tool 1, the workpiece 4 has been heated to its austenitizing temperature range, ie to a temperature above the transformation point AC3. The hot workpiece is then reshaped by lowering the upper die 2 to a three-dimensional geometry ( FIG. 2 ). As a result, the workpiece 4 is briefly over the entire surface in contact with the upper die 2 and the lower die 3, wherein a certain amount of heat from the workpiece 4 on the dies 2, 3 is transmitted. As a result, however, the material-specific critical cooling rate of the workpiece 4 is not achieved. Rather, the forming tool 1 is opened a gap wide in the next step, so that the coolant 6 in the gap 10, 11 between the Dies 3, 4 flows in ( FIG. 3 ). Due to the significantly lower temperature of the coolant 6 relative to the temperature of the workpiece 4 is a uniform curing of the entire workpiece 4, which is enclosed on both sides of the incoming coolant 6.
  • FIG. 2 can be seen that the coolant level 8 is still as low as in FIG. 1 because the displacement body 7 is not yet immersed in the coolant 6. As a result, the coolant can not yet flow into the mold cavity 9 of the forming tool 1.
  • the displacer 7 are at least partially in the coolant 6, so that the coolant level 8 has risen so far that the coolant 6 in the gap 10 between the lower die 3 and the workpiece 4 and in the gap 11 between the upper die 2 and the Workpiece 4 can flow.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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)
EP20080005252 2007-04-20 2008-03-20 Procédé de moulage et de durcissement d'une pièce à usiner en acier dans une presse à estamper Active EP1983063B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2010148542/05A RU2481888C2 (ru) 2008-03-20 2009-04-16 Пусковой нагреватель для реакторов синтеза аммиака

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710019173 DE102007019173B3 (de) 2007-04-20 2007-04-20 Verfahren zum Pressformen und Härten eines Werkstücks aus Stahl in einer Gesenkpresse

Publications (3)

Publication Number Publication Date
EP1983063A2 true EP1983063A2 (fr) 2008-10-22
EP1983063A3 EP1983063A3 (fr) 2011-10-19
EP1983063B1 EP1983063B1 (fr) 2013-01-09

Family

ID=39326705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080005252 Active EP1983063B1 (fr) 2007-04-20 2008-03-20 Procédé de moulage et de durcissement d'une pièce à usiner en acier dans une presse à estamper

Country Status (4)

Country Link
EP (1) EP1983063B1 (fr)
BR (1) BRPI0801178A2 (fr)
DE (1) DE102007019173B3 (fr)
MX (1) MX2008004916A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010061007A1 (fr) * 2008-11-03 2010-06-03 Fundacion Labein Procédé de trempe d'une pièce obtenue par estampage à chaud et dispositif utilisé dans le procédé
CN109517950A (zh) * 2019-01-09 2019-03-26 滦南县丰田五金农具制造有限公司 一种可调连续式五金工具压沾、淬火、冷却一体机及工艺
CN114101416A (zh) * 2020-09-01 2022-03-01 宁波祥路中天新材料科技股份有限公司 一种应用热成型的热辊冲压折弯成型机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053349B4 (de) * 2009-11-17 2014-07-03 Benteler Defense Gmbh & Co. Kg Panzerstahlbauteil
KR101257160B1 (ko) * 2010-01-27 2013-04-22 현대제철 주식회사 침수 냉각 방식을 사용하는 금형 장치
DE102015105585B4 (de) 2015-04-13 2018-07-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung eines Werkstücks aus Metallblech und Werkstück aus Metallblech
CN105328047A (zh) * 2015-11-05 2016-02-17 福州大学 一种具有新型冷却系统的超高强度钢板热冲压装置及其方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2603618A1 (de) 1975-06-05 1976-12-23 Kenebuc Galt Ltd Verfahren und vorrichtung zur waermebehandlung von stahl
DE2452486C2 (de) 1973-11-06 1985-10-17 Plannja AB, Luleå Verfahren zum Preßformen und Härten eines Stahlblechs mit geringer Materialdicke und guter Maßhaltigkeit
DE102004006093B3 (de) 2004-02-06 2005-12-01 Fes Gmbh Fahrzeug-Entwicklung Sachsen Verfahren zur Herstellung eines dreidimensional geformten Panzerungsbauteils für Fahrzeugkarosserien

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH183742A (de) * 1935-10-03 1936-04-30 Bigler Spichiger & Cie Ag Verfahren zum Härten von warm gepressten Werkstücken, insbesondere Hufeisen-Stollen.
JP3863874B2 (ja) * 2003-10-02 2006-12-27 新日本製鐵株式会社 金属板材の熱間プレス成形装置及び熱間プレス成形方法
DE102005028010B3 (de) * 2005-06-16 2006-07-20 Benteler Automobiltechnik Gmbh Verfahren und Presse zum Warmformen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2452486C2 (de) 1973-11-06 1985-10-17 Plannja AB, Luleå Verfahren zum Preßformen und Härten eines Stahlblechs mit geringer Materialdicke und guter Maßhaltigkeit
DE2603618A1 (de) 1975-06-05 1976-12-23 Kenebuc Galt Ltd Verfahren und vorrichtung zur waermebehandlung von stahl
DE102004006093B3 (de) 2004-02-06 2005-12-01 Fes Gmbh Fahrzeug-Entwicklung Sachsen Verfahren zur Herstellung eines dreidimensional geformten Panzerungsbauteils für Fahrzeugkarosserien

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010061007A1 (fr) * 2008-11-03 2010-06-03 Fundacion Labein Procédé de trempe d'une pièce obtenue par estampage à chaud et dispositif utilisé dans le procédé
CN109517950A (zh) * 2019-01-09 2019-03-26 滦南县丰田五金农具制造有限公司 一种可调连续式五金工具压沾、淬火、冷却一体机及工艺
CN114101416A (zh) * 2020-09-01 2022-03-01 宁波祥路中天新材料科技股份有限公司 一种应用热成型的热辊冲压折弯成型机

Also Published As

Publication number Publication date
DE102007019173B3 (de) 2008-05-29
BRPI0801178A2 (pt) 2008-12-02
MX2008004916A (es) 2009-03-02
EP1983063A3 (fr) 2011-10-19
EP1983063B1 (fr) 2013-01-09

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