EP3565677A1 - Procédé de fabrication de pièces métalliques en feuille et dispositif associé - Google Patents

Procédé de fabrication de pièces métalliques en feuille et dispositif associé

Info

Publication number
EP3565677A1
EP3565677A1 EP18700043.5A EP18700043A EP3565677A1 EP 3565677 A1 EP3565677 A1 EP 3565677A1 EP 18700043 A EP18700043 A EP 18700043A EP 3565677 A1 EP3565677 A1 EP 3565677A1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
preform
preforming
metal preform
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.)
Pending
Application number
EP18700043.5A
Other languages
German (de)
English (en)
Inventor
Thomas Flehmig
Martin Kibben
Daniel Nierhoff
Arndt MARX
Daniel CASPARY
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.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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 ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3565677A1 publication Critical patent/EP3565677A1/fr
Pending legal-status Critical Current

Links

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
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D22/30—Deep-drawing to finish articles formed by 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/16—Additional equipment in association with the tools, e.g. for shearing, for trimming
    • 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
    • B21D37/10—Die sets; Pillar guides

Definitions

  • the invention relates to a method and an apparatus for producing sheet metal components.
  • thermoforming has the advantage that the greatest possible material strengths can be achieved by the large plastic strains that occur as a result of the process and the concomitant solidification of the material used (steel sheets, aluminum sheets or other metallic materials).
  • thermoforming in particular the inclination of the component to the springback due to the inhomogeneous stress state after drawing and its sensitivity to batch fluctuations.
  • the expected springback is taken into account by using classical compensatory measures such as the so-called “Forward Springback Compensation” the expected springback values are incorporated in the opposite direction in the tool, so as possible after relief despite the inhomogeneous stress state Since these measures are not sufficient, in particular in the case of high-strength materials and in particular in combination with small sheet thicknesses, drawing and / or calibration processes are often required to achieve the required dimensional accuracy in further follow-up operations.
  • the flange trim can be integrated into the last deep drawing operation. Although this can be cost savings, but there are some disadvantages, such as the accrual of waste, the creation of complex tools, a complex Tryout, unwanted springback effects, limited dimensional stability and susceptibility to process disturbances.
  • the teachings have in common that in a first process step, a preform is generated which comes as close as possible to the finished shape of the component, which, however, in contrast to this no or only partially material additions for a trim and contains in typical sections such as floor area, Zargen Siemens and / or, if present in the flange region has a defined material surplus, which is used in a second process step to set by a special upsetting and / or calibrating the substantially entire component, the desired dimensional stability of the component including the edge contour without further cutting operations.
  • this known method eliminates the above-mentioned disadvantages of undesired springback and edge trimming, it may itself have some undesirable side effects of its own.
  • preforms produced in this way correspond to the required geometry, they can, however, in their edge contour, in particular in the case of complex component geometry and also in conjunction with small component thicknesses, reduce the length of the cross-sectional developments due to fluctuations in a batch change and / or wear of the preforming tools and / or the tribological properties of tools Material out vary so that the preforms thus produced in the subsequent upsetting and / or Kalibriergesenk not or only limited can be processed. With regard to process reliability, the method and the device can be further optimized.
  • the invention is therefore based on the object to provide a generic method and a generic device, with which or which manufactured sheet metal preforms regardless of batch and / or tribology, in particular with a repeatable geometry of the sheet metal preform in the upsetting and / or Kalibriergesenk process reliable, in particular can be processed without final trim.
  • the region directly adjoining the sheet metal preforming edge of the sheet metal preform which is at least partially sectioned has a positive dimensional deviation at least in sections in relation to the unwound length of the corresponding region of the finished shaped sheet metal component for upsetting and / or calibrating.
  • the production of the sheet metal preform can be made by means of any combinable shaping process in one or more steps.
  • the preforming may include, for example, a deep-drawing-type forming step.
  • a multi-stage shaping can also be carried out, for example embossing of the floor area to be created and raising of the frame area to be created or optionally stopping of the flange area to be created.
  • the deep drawing carried out for preforming is carried out in one or more stages.
  • the sheet metal preform obtained by preforming can, in particular, be regarded as a sheet metal component which is as close to a final shape as possible, taking into account the intended finished part geometry taking into account given boundary conditions such as springback and forming capacity of the material used good matches.
  • the deviation of the edge contour of the sheet metal preform from its prefabricated sheet metal preform is preferably at least in sections positive (with more material).
  • the absolute deviation of the edge contour of the component preform to the edge contour of the component preform should be low in the context of the technical possibilities by a suitable method design, but this is often not possible in practice. Rather, the focus of the method design is to keep the absolute deviation of the edge contour of the component preform as low as possible during the course of the process.
  • the upsetting / calibrating can be understood, in particular, to mean a finish-forming or final shaping of the trimmed sheet-metal preform, which can be achieved, for example, by one or more pressing operations.
  • the substantially finished molded sheet metal component can be understood as a final molded sheet metal component.
  • the substantially finished formed sheet metal component may be subjected to further component modifying processing steps, such as insertion of tie holes, end cap flanking, collar insertion, and / or zone edge trimming.
  • the aim is to design the calibration form such that essentially no further transformation steps are necessary.
  • cross section means a section through the transverse extent of the sheet metal preform / the trimmed sheet metal preform / the finished molded sheet metal component.
  • the sheet metal component is not designed flanges, at least on one side of the finished sheet metal component provided at least partially flange portion at least on one side in the longitudinal direction and / or transverse extent provided, in particular on both sides of the finished molded sheet metal component, which, for example, for connection serves other components and is also referred to as a joint flange.
  • the frame area is provided on at least one side of the finished shaped sheet metal component in the longitudinal direction, in particular on two opposite sides of the finished sheet metal component, wherein the fertigformed sheet metal component has, for example, a substantially hat-profile-like cross-section, each having a Zargen Suite on both sides, wherein the Zargen Suitee identical but also can be designed with a different heights.
  • the bottom region is formed integrally with the frame region (s) via a further transition region and, depending on the complexity of the sheet metal component to be produced, does not need to be limited to one plane, but may also be provided in regions at different levels in the longitudinal extent.
  • the transitions between each level in the floor area can be gradual or swinging be executed, in particular can be spoken of a so-called cranked execution.
  • the finished-shaped sheet metal component may also have other than in the longitudinal extent or longitudinal axial forms, for example, it may be arcuate, C-, L-shaped.
  • the trimmed sheet metal preform at least partially in cross-section on a developed length, which is between 0.5% to 4% longer in relation to the unwound length of the finished molded sheet metal component.
  • the unwound length of the thus considered cross sections of the trimmed sheet metal preform is in sections or as a whole preferably between 0.7% to 3.3% longer than that of the finished molded sheet metal component. If, as a result of the litigation during the production of the trimmed sheet metal preform, the unwound length of the cross sections vary too much, then too little unwound length would mean that there would not be enough material surplus available for the subsequent upsetting / calibrating step, which would affect the dimensional accuracy of the component. On the other hand, if the unwound length of the considered cross-section of the trimmed sheet metal preform is too large, the oversized surplus material would collapse into waves during the subsequent calibration process, which may mean a visual and / or dimensional defect.
  • the material flow is selectively controlled at least in regions during the preforming of the sheet to the sheet metal preform.
  • the material supply is bead-like, wavy and / or slightly pleated.
  • the material stocks are selectively introduced or provided via at least one preforming tool.
  • the material stocks are selectively introduced or provided via at least one preforming tool.
  • the trimming tool is set up so that in immediately adjacent to the Blechvorformkante area of at least partially cut sheet metal preform at least partially in cross-section a positive dimensional deviation with respect to the unwound length of the corresponding region of the preformed sheet metal component for upsetting and / or calibration remains.
  • a repeatable geometry in particular with regard to the position of the component edges of the trimmed sheet metal preform and thus the sheet preforming edge which is essential for the subsequent upsetting / calibrating can be ensured.
  • the device comprises a preforming tool with, for example, a preform punch, a preform die and a blank holder.
  • the bottom portion of the preform die may be at least partially detached and movable, at least in sections, from the remainder of the preform die to form, for example, an (inner) hold-down.
  • a blank holder can be used.
  • the preparation of the sheet metal preform can preferably be carried out by a conventional deep drawing.
  • the preform die can at least in some areas have at least one draw bead and / or draw step, which positively supports, in particular, the ironing during deep drawing to form the blank preform and to ensure sufficient development in transverse extension and / or longitudinal extension on the blank preform.
  • the production of the sheet metal preform can take place in two or more stages or preform tools.
  • the at least one preforming tool is designed, during the preforming of the sheet metal to form the sheet metal preform, for example by deep drawing, to provide material storage according to an embodiment of the device.
  • the device comprises a trimming tool, in particular for a trim to be performed on the sheet metal preform, with a holding-down device and a die.
  • the hold-down device and the die are preferably designed to receive the sheet metal preform in a clamping manner between them, in particular without any further plastic shaping, apart from the intended trimming.
  • smaller transformations can also be integrated in certain areas.
  • the contour of the blank holder and the die which contacts the bottom area and the frame area of the sheet metal preform at least in some areas, essentially corresponds to the contour of the desired sheet metal preform. This ensures that the measures implemented in the sheet metal preform for upsetting / calibrating are not compensated again in the trimming tool.
  • the trimming tool can comprise movable cutting elements, in particular in the form of cutting punches and counter holders, relative to the ram and / or die.
  • a laser for trimming can also be used.
  • the device comprises a calibration tool with a calibration stamp, a calibration die and a shut-off element.
  • the contour of the calibration punch and the calibration die essentially corresponds to the base region, frame region and optionally flange region, in particular the desired geometry of the sheet metal component to be finished.
  • the shut-off serves as an abutment during upsetting / calibrating particular sheet metal edges in the flange of the finished sheet metal component and thus blocks a flow of material away from the sheet metal component, so that straightened voltages set in the finished sheet metal component to produce a particular high dimensionally stable sheet metal component.
  • the shut-off elements as part (s) of the calibration tool, may be movable relative to the sizing die and / or sizing die, either coaxial with both movable or angularly movable in and out.
  • the shut-off can be made in one piece in the calibration die in particular as a step and / or projection, whereby the number of parts of the calibration tool can be reduced.
  • the upsetting / calibration can also take place in two or more stages or calibration tools.
  • the device is integrated in a progressive compound press.
  • a progressive compound press In particular, in the production of mass products, for example, for products in the automotive industry, products such as sheet metal parts are produced in particular economically in follow-on composite press.
  • FIG. 2a, b an embodiment of a preform tool according to the invention for
  • Fig. 4a, b an embodiment of a calibration tool according to the invention for
  • Fig. 5 shows an embodiment of a first finished sheet metal component
  • Fig. 6 shows an embodiment of a second finished sheet metal component.
  • a flat sheet (1) is shown in cross-section, which is unwound from a coil, not shown, and cut to length, and in particular as a defined blank blanks the other method available.
  • the sheet (1) is made of a steel material, preferably of a high-strength steel material. Alternatively, aluminum materials or other metals may be used.
  • the sheet can also be provided as a tailored product.
  • the sheet metal (1) is first reshaped by conventional methods such that the geometry of the sheet metal preform (2) is provided with a surplus of material, for example in the form of at least one material supply (4) in the bottom area (2.1) for the further processes ,
  • the surplus material can also alternatively or cumulatively in the frame area (2.2), in the flange (2.3) and / or in the transition areas (2.4, 2.5) between bottom portion (2.1), frame portion (2.2) and flange (2.3), not shown here provided become.
  • the sheet metal preform (2) can preferably be produced by a conventional deep drawing.
  • the sheet metal preform (2) is produced, for example, in a preforming tool (5), wherein the flat sheet metal (1) is inserted into the opened preforming tool (5) with suitable means not shown here, and subsequently a preforming punch ( 5.1), a preform die (5.2) and at least one blank holder (5.3) acting on the plate (1).
  • the movement and / or movement of the components of the preforming tool (5) is symbolically shown by the double arrows (5.11, 5.31) shown.
  • the sheet holder (5.3) clamps the sheet (1).
  • the preform punch (5.1) is moved in the direction UT and forms the sheet (1) to a sheet metal preform (2).
  • the blank holder (5.3) can be distanced or subjected to a force.
  • the preform die (5.2) can have at least one drawing bead and / or drawing step (5.4) at least in some areas, which supports in particular the ironing during deep drawing to the sheet metal preform (2) and provides sufficient development Transverse extension (Q ") and / or longitudinal extension (A") on the sheet metal preform (2), and avoid unwanted wrinkles safely.
  • the preform punch (5.1) optionally in combination with an inner hold-down (not shown here), adapted to that during the preforming of the sheet (1) to the sheet metal preform (2) material storage (4).
  • FIG. 2a shows the preforming tool (5) in the so-called bottom dead center.
  • the sheet metal preform (2) has, for example, a transverse extent (Q ") and a longitudinal extension (A"), wherein the longitudinal extent (A ") is for example many times higher than the transverse extent (Q") and symbolized in the direction of the image plane.
  • the removed sheet metal preform (2) is inserted into a trimming tool (6), which comprises a holding-down device (6.1) and a die (6.2).
  • the hold-down device (6.1) and the die (6.2) are preferably designed to receive the sheet metal preform (2) in a clamping or fixing manner between it and in particular without any further plastic shaping.
  • the contour of the hold-down (6.1) and the die (6.2), which at least partially contact the bottom area (2.1) and frame area (2.2) of the sheet metal preform (2), substantially correspond to the contour of the preform punch (5.1) and the preform Gesenk (5.2). This can ensure that the measures implemented in the sheet metal preform (2) for compression / calibration are not negatively influenced in the trimming tool.
  • the trimming tool (6) comprises movable cutting elements (6.3, 6.4, 6.5, 6.6) relative to the hold-down device (6.1) and / or die (6.2).
  • the movement and / or movement of the components of the trimming tool (6) is shown symbolically by the illustrated double arrows (6.11, 6.31, 6.41, 6.51, 6.61).
  • the sheet metal preform (2) is trimmed in such a way that the unwound length (L) of the trimmed sheet preform (2 ') in cross section is between 0.5% to 4% longer with respect to the unwound length (L') of the finished formed sheet metal component (3).
  • the trimmed sheet metal preform (2 ') has a longer flange area (2' .3, M) with respect to the flange area (3.3, M ') of the finished shaped sheet metal part (3).
  • the flange area (2 '.3) is then cut off at least in sections in a cutting or punching process so as to produce a repeatable cross-sectional development or a sheet metal preforming edge (2' .31) for the subsequent upsetting / calibrating process .
  • the number of cutting elements is not set to four, but rather only one cutting element can be provided per side, which can act on the flange area (2.3) of the sheet metal preform (2) cutting from above or from below.
  • the trimmed sheet metal preform (2 ') has in cross section a transverse extension (Q) and optionally a longitudinal extent (A), which is smaller in comparison to the transverse extent (Q ") and possibly to the longitudinal extent (A") of the sheet metal preform (2).
  • the trimmed sheet metal preform (2 ') removed from the trimming tool (6) still has springback as before insertion and is inserted into a calibration tool (7) which has a calibration punch (7.1) and a calibration (7.2).
  • FIG. 4a) shows the calibration tool (7) at bottom dead center.
  • the calibration tool (7) in particular comprises a shut-off element (7.3), which acts as an abutment on the peripheral edge (2 '.31) of the trimmed sheet metal preform (2') in order to finalize the final, during compression / compression To bring near-net shape geometry of the finished sheet metal component ( Figure 4b).
  • the movement and / or movement of the components of the calibration tool (7) is shown symbolically by the illustrated double arrows (7.11, 7.21, 7.31).
  • a high dimensionally stable, flange-shaped sheet-metal component (3) is provided in the calibration tool (7) ) generated.
  • the region (2.2, 2.5, 2.3) directly adjoining the sheet metal preforming edge (2 '.31) of the at least partially trimmed sheet metal preform (2') has a positive dimensional deviation (M) at least in sections has developed unwound length ( ⁇ ') of the corresponding area (3.2, 3.5, 3.3) of the finished shaped sheet metal component (3, 3', 3 ") for swaging and / or calibrating
  • M positive dimensional rejection
  • the invention is not limited to the embodiments shown. Other component shapes are also possible and require correspondingly adapted tool contours.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Forging (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'une pièce métallique en feuille (3, 3', 3'') à la cote, le procédé comprenant les étapes consistant à : - préformer une feuille métallique (1) pour obtenir une feuille métallique préformée (2) présentant au moins une zone formant fond (2.1), une zone formant paroi latérale (2.2), une zone de transition (2.4) entre les zones formant fond et formant paroi latérale, éventuellement une zone formant rebord (2.3) et une zone de transition (2.5) entre les zones formant paroi latérale et formant rebord, au moins une des zones (2.1, 2.2, 2.3, 2.4, 2.5) présentant au moins par endroits un matériau excédentaire (4, M) ; - à découper la préforme en feuille métallique (2) au moins par endroits pour obtenir une feuille métallique préformée découpée (2') avec un bord (2'.31) de feuille métallique préformée ; et - à refouler et/ou étalonner l'au moins une feuille métallique préformée découpée (2') au moins par endroits pour obtenir une pièce métallique en feuille (3, 3', 3'') sensiblement finie.
EP18700043.5A 2017-01-05 2018-01-02 Procédé de fabrication de pièces métalliques en feuille et dispositif associé Pending EP3565677A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017200115.1A DE102017200115A1 (de) 2017-01-05 2017-01-05 Verfahren zum Herstellen von Blechbauteilen und Vorrichtung hierfür
PCT/EP2018/050039 WO2018127480A1 (fr) 2017-01-05 2018-01-02 Procédé de fabrication de pièces métalliques en feuille et dispositif associé

Publications (1)

Publication Number Publication Date
EP3565677A1 true EP3565677A1 (fr) 2019-11-13

Family

ID=60935875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18700043.5A Pending EP3565677A1 (fr) 2017-01-05 2018-01-02 Procédé de fabrication de pièces métalliques en feuille et dispositif associé

Country Status (6)

Country Link
US (1) US11267032B2 (fr)
EP (1) EP3565677A1 (fr)
CN (1) CN110167690A (fr)
DE (1) DE102017200115A1 (fr)
MX (1) MX2019008069A (fr)
WO (1) WO2018127480A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6708182B2 (ja) * 2017-08-07 2020-06-10 Ｊｆｅスチール株式会社 プレス成形品の製造方法
US20220212243A1 (en) * 2019-05-20 2022-07-07 Jfe Steel Corporation Method for manufacturing pressed component, and shape correction die
CN114505432B (zh) * 2022-02-24 2024-05-14 漳州锐腾电器有限公司 一种改变冲压件截面宽度的墩挤模具及墩挤精切工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1190556A (ja) * 1997-09-25 1999-04-06 Matsushita Electric Works Ltd 打ち抜き加工方法
DE102007059251A1 (de) 2007-12-07 2009-06-10 Thyssenkrupp Steel Ag Herstellverfahren hoch maßhaltiger Halbschalen
DE102008034996B4 (de) * 2008-07-25 2010-11-18 Benteler Automobiltechnik Gmbh Vorrichtung zum Warmformen, Presshärten und Schneiden eines Halbzeugs aus härtbarem Stahl
DE102008037612B4 (de) 2008-11-28 2014-01-23 Thyssenkrupp Steel Europe Ag Verfahren und Werkzeugsatz zur Herstellung von flanschbehafteten, hoch maßhaltigen und tiefgezogenen Halbschalen
DE102009059197A1 (de) * 2009-12-17 2011-06-22 ThyssenKrupp Steel Europe AG, 47166 Verfahren und Vorrichtung zur Herstellung eines Halbschalenteils
DE102013103612B8 (de) 2013-04-10 2023-12-28 Thyssenkrupp Steel Europe Ag Verfahren und Stauchwerkzeug zur Herstellung von hoch maßhaltigen Halbschalen
DE102013103751A1 (de) * 2013-04-15 2014-10-16 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung von hochmaßhaltigen Halbschalen und Vorrichtung zur Herstellung einer Halbschale

Also Published As

Publication number Publication date
WO2018127480A9 (fr) 2019-05-09
CN110167690A (zh) 2019-08-23
WO2018127480A1 (fr) 2018-07-12
DE102017200115A1 (de) 2018-07-05
US20200384522A1 (en) 2020-12-10
MX2019008069A (es) 2019-08-29
US11267032B2 (en) 2022-03-08

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