WO2017121786A1 - Procédé et dispositif de façonnage à chaud de tôles en acier - Google Patents

Procédé et dispositif de façonnage à chaud de tôles en acier Download PDF

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Publication number
WO2017121786A1
WO2017121786A1 PCT/EP2017/050544 EP2017050544W WO2017121786A1 WO 2017121786 A1 WO2017121786 A1 WO 2017121786A1 EP 2017050544 W EP2017050544 W EP 2017050544W WO 2017121786 A1 WO2017121786 A1 WO 2017121786A1
Authority
WO
WIPO (PCT)
Prior art keywords
die
punch
tool
forming
locking means
Prior art date
Application number
PCT/EP2017/050544
Other languages
German (de)
English (en)
Inventor
Thomas Kurz
Harald Schwinghammer
Johannes HASLMAYR
Siegfried Kolnberger
Original Assignee
Voestalpine Stahl Gmbh
Voestalpine Metal Forming 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 Voestalpine Stahl Gmbh, Voestalpine Metal Forming Gmbh filed Critical Voestalpine Stahl Gmbh
Publication of WO2017121786A1 publication Critical patent/WO2017121786A1/fr

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a method and an apparatus for hot forming and in particular press hardening of steel sheets.
  • a steel sheet of egg ⁇ ner curable steel sheet alloy for example, a 22MnB5 or related steel alloys, which is uncoated or provided with a metallic protective layer, such as a zinc ⁇ layer, cold in a conventional press line transformed into the desired component.
  • a metallic protective layer such as a zinc ⁇ layer
  • a subsequent thermal expansion may be actuated by one into account ⁇ ⁇ ent speaking smaller dimensions of the component.
  • this component is heated to a temperature above the Austenitmaschinestemperatur.
  • the Austenitisie ⁇ tion temperature is the temperature at which the structure of the steel alloy is present in a fully austenitized state in a sufficient time and thus preferably a temperature above Ac 3 .
  • the thus-heated component is then placed in a ⁇ a tool, the shape of the component speaks its tool Lower and upper parts exactly in its stretched state by heat corresponds.
  • This tool is closed and cured by all-round rapid removal of the heat at a rate above the critical cure speed.
  • the latter step is called form hardening because the part is here in the Form is cured, but no significant forming steps take place.
  • the second known method provides for heating a circuit board of an above hardenable steel sheet is also at a temperature above the austenitization temperature (AC 3) for this alloy coins ⁇ tion and then in a preferably a ⁇ stage forming process as well as hardening.
  • AC 3 austenitization temperature
  • the sheet steel plate is placed in the heated state in a tool and then deep drawn through the upper and lower part of the tool. After closing the tool halves, the heat of the sheet is removed at a speed above the critical hardness speed, so that hardening takes place.
  • DE 10 2008 034 996 B4 discloses a device for hot forming and press hardening ⁇ a semifinished product made from hardenable steel ⁇ be known, said apparatus having a die and a male mold having a shaping portion. These two parts are mutually movable and one another, wherein the Vorrich ⁇ tion additionally has a cutting device with an upper and lower blade, wherein the punch mounted at least on the press ⁇ plunger and is movably mounted relative to the press ram and the die indirectly on the press table ⁇ introduced is.
  • DE 10 2010 023 001 AI relates to a tool for drawing sheet metal, in particular for deformation with small radii. This should preferably be automotive moldings. In this case, the sheet to be deformed should be in a manner known per se between a die and a male or a punch corresponding to the contour of the die and the die
  • the stamp will be deformed.
  • the stamp in the region of a deformation that is critical due to the small radius, the stamp should comprise an insert spring-loaded via pressure medium, which has a Stop should be biased against the punch.
  • the problem here is based on the fact that when pulling in Radienbe ⁇ rich, the sheet is always thinner and flows through voltage differences ⁇ the sheet over the stamp. The originally thinned area leaves behind a mark that is visible even after painting, for example, a body part. Such markings are called running edges, which can be seen on the sheet surface.
  • the punch in the range of a critical due to the small radius of deformation is intended to include a spring-loaded via pressure medium ⁇ A set, which is preferably biased against the plunger by a stop.
  • thermoforming From DE 103 18 056 B4 a method and a press for thermoforming is known, wherein in the method, a mold component made of metal is performed so that a semifinished product is heated to ⁇ forming temperature and in a press with a die, a punch and a Hold-down is formed, wherein the semi-finished by an upper and a lower hold-down, which are movable with respect to both the die and against the punch, freely preformed and then in the same press by closing the die and the die final molded and cured at the same time.
  • cold preforming of steel semi-finished products causes problems if this steel has been provided with an aluminum coating. It is well known that cold preforming of aluminum coated steel sheets results in cracks in the particularly heavily deformed areas. Accordingly, this should be avoided by the hot preforming.
  • a die cushion device which serves to generate a pressing force on a punch in a pressing machine, wherein the cushion is to receive a force from the punch and has a Abstützab ⁇ section , which supports the cushion pad.
  • a shock absorber should be present which is adapted to relieve an impact between the cushion pad and the support portion, wherein a damping portion is present, the gene ⁇ riert a reaction force corresponding to a relative speed of the cushion pad with respect to the support portion and an elastic portion which is adapted to generate the reaction force corresponding to a relative displacement of the cushion pad on the support portion.
  • the object of the invention is to provide a method with which the forming and cooling in press hardening safer ge ⁇ lingt.
  • the invention relates according to claim 1, a method for ⁇ forming steel sheets and in particular method for press hardening ⁇ steel sheet, wherein a at least partially heated to a temperature above Ac 3 heated board from a hardenable steel sheet material in a forming and hardening tool and then in the forming and hardening ⁇ tool by the retraction of at least one stamp in at least one die or vice versa or the collision of Stem ⁇ pel and die is provided with a desired contour, wherein the punch inserted into the die to the positive fit ren and is then moved apart again and the formed and hardened sheet metal component is removed, where ⁇ at the speed of the punch (2) and / or the die (3) when reaching the positive connection> 0 m / s.
  • the method can be particularly distinguished in the case of simple geometries, for example a hat profile, in particular geometries with simply curved radii.
  • the invention may be distinguished by the fact that the number of so-called microcracks in the range between 10 pm and 30 pm is likewise prevented or at least greatly reduced.
  • the forming speed is kept the same or the Pressenzufahr für not changed, so that the male and female are driven with the least possible speed to stop (positive engagement).
  • the acceleration (ie any change in speed) during the forming process should be less than TT m / s 2 , preferably less than 1 m / s 2 , more preferably less than 1 / 7T m / s 2 .
  • the mold or the mold is protected from destruction in that the die and / or are Pat ⁇ rize supported such that the undiminished Zufahrge- speed by suitable means and in particular by controllable resilient means the passive or active movement of the Matrix and / or male is quasi intercepted.
  • both the die and the punch with resilient means in particular controllable compliant with ⁇ stuffs to be stored “resilient.”
  • Spring-mounted in the sense of the invention means that mecha ⁇ niche or hydraulic spring elements or spring-damper members or damper members are used. These elements can here react passively or actively controlled to ⁇ .
  • the spring or Dämpferkräf ⁇ te are designed so that after the complete collapse of the mold halves, a spring or damper force is overcome, which then leads to a deflection of the spring and / or the damper.
  • a mechanical releasing means may be present in the case of complete closure of the plant ⁇ generating halves, for example, one or more pawls are moved out of engagement and so a further movement of the entire mold along a traverse path allows.
  • a corresponding sensor can be provided, which made a mechanical release ⁇ light.
  • this sensor can also be used to release a hydraulic valve or the like.
  • a continuous force or path or force / displacement measurement can also be carried out, so that upon reaching certain Forces a release of the spring or damping movement he follows ⁇ .
  • a metered release of the springs or dampers of the ⁇ art can be performed in that a hydraulic control circuit is only partially open, and thus the forces are only partially intercepted.
  • the invention is exemplified erläu ⁇ tert reference to a drawing. It shows:
  • Fig.l a forming tool with inserted board in the initial state of ⁇ the prior art
  • FIG. 2 shows the tool according to FIG. 1 in a completely closed and completely deformed state of the board
  • Figure 3 shows the tool according to the invention with sprung construction with inserted board in the initial state.
  • Figure 4 shows the tool according to the invention with fully converted ⁇ deformed state in the fully closed state ⁇ tool not springs
  • Figure 5 shows the tool according to the invention, in complete charge ⁇ herebyem state with completely reshaped Plati ⁇ ne and the Federendanditen.
  • Fig. 6 is a time chart showing a press speed conventional course and the course in the embodiment OF INVENTION ⁇ to the invention.
  • a conventional forming tool and in particular Hotumform ⁇ tool according to the prior art 100 has a punch 101 and a die 102 and plate holder 103 and Niederhal ⁇ ter 103.
  • the die has a contour 104, which corresponds to the contour of a component to be formed, wherein the Stamp 101 has a contour 105 which is a form-fitting into the die ⁇ passable and accordingly also corresponds to the contour of a zu-generating component ⁇ .
  • the sheet holder 103 are übli ⁇ arranged chnchsee around the contour 104 of the die around and serve to press a printed circuit board 106 in the edge regions on the tool or the die, so that when the stem ⁇ pel is retracted into the die 102101 , the sheet metal material is drawn, ie, flows into the die (Fig. 2).
  • the mold 3 has a contour 5, the contour of a forth ⁇ that delivers the component or molded Contour of a component to be produced corresponds, wherein the punch 2 has a contour 6, which corresponds to the contour 5 substantially and in particular between the contour 5 and 6 a positive connection optionally results in a positive connection with an intermediate ⁇ lying board 7, which is formed accordingly ,
  • metal holder or hold-down 4 are present, which act on edge regions of a board 7 and hold them on the die 3, so that when closing the mold by the retraction of the punch 2 in the contour 5 of the die 3 causes the material of the Board 7 accordingly flows into the contour 5.
  • the die is also arranged on a base frame 8 or foundation or on the Base frame 8 elevated, wherein between the base frame 8 and the die 3 yielding means 9 are present.
  • the particular controlled resilient means 9 are, for example, mechanical springs, these mechanical Fe ⁇ countries on preferably mechanical or electrical release ⁇ elements (not shown) have, which release the springs upon reaching a predetermined desired state and a off ⁇ steering of the springs against allow the spring force.
  • the controlled resilient elements may also be dampers, for example oil and / or gas pressure damper, which are deflected when reaching ei ⁇ Nes target state.
  • dampers gas pressure or oil pressure damper or hydraulic or fluidic damper may have mechanical or electrically controlled locking means which are ge ⁇ opens when reaching the desired state.
  • dampers can also have valves which, when a desired state (a desired pressure state) is reached, are wholly or partially opened and thus permit a deflection.
  • controlled compliant members also to gas springs or pneumatic springs han ⁇ spindles, wherein can also be present in these mechanical or fluid release means (valves).
  • controlled compliant members can also see electrical resilient elements, such as magnets or Wirbelstrombrem ⁇ sen.
  • controlled yielding elements may also be mixtures of said elements. It is essential that these elements allow a movement of the die according to the retraction movement of the punch when reaching a pre ⁇ given set value.
  • a board 7 is inserted into the ge ⁇ opened tool (Fig. 3). Subsequently, the hold-downs are fed to the die, so that the board 7 between the holders 4 and the die 3 is clamped. After the board is held in this manner 7, insbeson ⁇ particular a heated to austenitizing board, the punch 2 is with its contour 6 retracted in the contour 5 of the die 3 to the circuit board 7 is fully converted (Fig. 4).
  • a heated to austenitizing board 7 in particular a heated via AC 3 Plati ⁇ ne, no later than rize with the full concern of Patterson and the die to the circuit board and thus the voll/i ⁇ gen forming the quenching in the heat is derived from the board 7 both in the die and in the male or the stamp.
  • the release can be done in the simplest case by the fact that a certain spring constant is present, which is only exceeded when the punch 2 exceeds a certain pressure against the die 3 (uncontrolled). Moreover, it is possible in the invention to take up the pressure between the die 2 and the die 3 via entspre ⁇ sponding pressure sensor and, if a pressure actual value which corresponds to a desired pressure value to unlock controlled 9 nachgiebi ⁇ gene elements and thus a Auslen ⁇ kung along the direction of movement 10 of the punch 2 (Fig. 4).
  • the path of the punch is received in the die, wherein the displacement sensor or sensors enable the controllable nachgiebi ⁇ gene elements 9 when a certain way was exceeded, the complete closing or complete molding of the board 7 in the die 3 ent ⁇ speaks.
  • the control must in any case take place in a manner as shown in the diagram (FIG. 5).
  • the conventional course of the press speed is here ⁇ in the left half of the diagram visible, which means that after the start of the conversion, ie after touching the punch and the board, the speed of the punch decreases ⁇ decreases until the end of the conversion is reached. would the speed did not decrease, the tool and the workpiece would inevitably be damaged or destroyed.
  • the press speed at the form fit is more than 10 mm / s.
  • too high a pressure pushers are cushioned due to an excessively high punch speed due to the fact that the entire tool can be deflected in accordance with the direction of movement 10 of the punch.
  • the arrangement of the controllably compliant elements 9 has been made in the area of the die.
  • controllable resilient elements 9 and between the die 2 and the punch drive (not shown) to be arranged so that after reaching a vorgege- surrounded pressure a entspre ⁇ sponding load circuit or overload circuit is also present in the region of the punch driver.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne un procédé de façonnage de tôles en acier et en particulier un procédé de trempe sous presse d'une tôle en acier, une platine, chauffée à une température supérieure à AC3, constituée d'un matériau de tôle en acier trempant étant introduite dans un outil de façonnage et de trempe et étant ensuite dotée d'un contour souhaité dans l'outil de façonnage et de trempe par l'insertion d'au moins un poinçon dans au moins une matrice, le poinçon (2) étant inséré dans la matrice (3) jusqu'à complémentarité de forme et ensuite éloigné à nouveau et la pièce en tôle façonnée et trempée étant retirée. Le procédé est caractérisé en ce que le poinçon (2) est inséré dans la matrice (3) jusqu'à ce que la complémentarité de forme soit atteinte et/ou jusqu'à ce qu'une course prédéfinie du poinçon soit dépassée et/ou jusqu'à ce qu'une force de pressage prédéfinie du poinçon sur la platine (7) et/ou la matrice (3) soit dépassée et/ou jusqu'à ce qu'une force de pressage prédéfinie du poinçon (3) sans ou sensiblement sans modification de vitesse dans la matrice (3) soit dépassée. L'invention concerne en outre un dispositif pour mettre en œuvre le procédé.
PCT/EP2017/050544 2016-01-14 2017-01-12 Procédé et dispositif de façonnage à chaud de tôles en acier WO2017121786A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016100589.4 2016-01-14
DE102016100589.4A DE102016100589A1 (de) 2016-01-14 2016-01-14 Verfahren und Vorrichtung zum Warmformen von Stahlblechen

Publications (1)

Publication Number Publication Date
WO2017121786A1 true WO2017121786A1 (fr) 2017-07-20

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DE (1) DE102016100589A1 (fr)
WO (1) WO2017121786A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115519034A (zh) * 2022-09-21 2022-12-27 成都市鸿侠科技有限责任公司 一种热成型模具

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Publication number Priority date Publication date Assignee Title
DE102017127158A1 (de) * 2017-11-17 2019-05-23 HoDforming GmbH Verfahren zum Umformen eines Blechrohlings, z. B. einer Platine oder eines Hohlkörperrohlings als Werkstück in einem Umformwerkzeug

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JP2008087001A (ja) * 2006-09-29 2008-04-17 Mazda Motor Corp 板状ワークの加工方法及び加工装置
DE102008034996B4 (de) * 2008-07-25 2010-11-18 Benteler Automobiltechnik Gmbh Vorrichtung zum Warmformen, Presshärten und Schneiden eines Halbzeugs aus härtbarem Stahl
EP2583768A1 (fr) * 2011-10-22 2013-04-24 Volkswagen Aktiengesellschaft Outil et procédé de formage à chaud, en particulier pour le durcissement et découpe d'une tôle
EP2993241A1 (fr) * 2014-08-26 2016-03-09 Benteler Automobiltechnik GmbH Procede et presse pour fabriquer au moins en partie des composants de tole durcis

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DE3613202A1 (de) 1985-05-14 1986-11-20 Bühler, Eugen, Dipl.-Ing., 8877 Burtenbach Einrichtung zur herstellung von keramischen formlingen stichwort: gefederter schiesskopf
DE8514337U1 (fr) 1985-05-14 1986-11-20 Buehler, Eugen, Dipl.-Ing., 8877 Burtenbach, De
DE10318056B4 (de) 2003-04-17 2006-04-06 Benteler Automobiltechnik Gmbh Verfahren und Presse zum Warmformen
DE102005041741B4 (de) * 2005-09-02 2010-03-18 Daimler Ag Verfahren zum Herstellen eines pressgehärteten Bauteils
JP5296415B2 (ja) 2008-05-22 2013-09-25 株式会社小松製作所 ダイクッション装置
DE102010023001A1 (de) 2010-04-27 2011-10-27 Läpple Werkzeugbau GmbH Werkzeug und Verfahren zum Ziehen von Blech

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008087001A (ja) * 2006-09-29 2008-04-17 Mazda Motor Corp 板状ワークの加工方法及び加工装置
DE102008034996B4 (de) * 2008-07-25 2010-11-18 Benteler Automobiltechnik Gmbh Vorrichtung zum Warmformen, Presshärten und Schneiden eines Halbzeugs aus härtbarem Stahl
EP2583768A1 (fr) * 2011-10-22 2013-04-24 Volkswagen Aktiengesellschaft Outil et procédé de formage à chaud, en particulier pour le durcissement et découpe d'une tôle
EP2993241A1 (fr) * 2014-08-26 2016-03-09 Benteler Automobiltechnik GmbH Procede et presse pour fabriquer au moins en partie des composants de tole durcis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115519034A (zh) * 2022-09-21 2022-12-27 成都市鸿侠科技有限责任公司 一种热成型模具
CN115519034B (zh) * 2022-09-21 2024-04-05 成都市鸿侠科技有限责任公司 一种热成型模具

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