EP0974411B1 - Outillage de formage gravé pour formage par fluide sous pression - Google Patents

Outillage de formage gravé pour formage par fluide sous pression Download PDF

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Publication number
EP0974411B1
EP0974411B1 EP99113024A EP99113024A EP0974411B1 EP 0974411 B1 EP0974411 B1 EP 0974411B1 EP 99113024 A EP99113024 A EP 99113024A EP 99113024 A EP99113024 A EP 99113024A EP 0974411 B1 EP0974411 B1 EP 0974411B1
Authority
EP
European Patent Office
Prior art keywords
engraving
workpiece
microstructures
tool
forming
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.)
Expired - Lifetime
Application number
EP99113024A
Other languages
German (de)
English (en)
Other versions
EP0974411A1 (fr
Inventor
Bernd Dr.-Ing. Schulze
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.)
Dr Meleghy Hydroforming GmbH and Co KG
Original Assignee
Dr Meleghy Hydroforming GmbH and Co KG
Meleghy Hydroforming GmbH and Co KG
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 Dr Meleghy Hydroforming GmbH and Co KG, Meleghy Hydroforming GmbH and Co KG filed Critical Dr Meleghy Hydroforming GmbH and Co KG
Publication of EP0974411A1 publication Critical patent/EP0974411A1/fr
Application granted granted Critical
Publication of EP0974411B1 publication Critical patent/EP0974411B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction

Definitions

  • the invention relates to a tool engraving Forming tool for forming by means of active medium, according to the Preamble of the first claim, the tool a pressure medium supply for the active medium and a Engraving according to the desired final contour of the Has workpiece and liquid or as the active medium gaseous pressure media are used.
  • the invention can for the internal high pressure forming of tubular workpieces as well from adjacent to one another and possibly with one another connected double plates as well as in the hydroforming of Single or double boards or with hydromechanical Thermoforming application.
  • the object of the invention is to deform the To prevent the workpiece by the active medium and the Improve surface quality and at the same time defined To achieve surface properties of the workpiece.
  • This object is achieved with the features of first claim solved in that in the engraving microstructures are incorporated into the tool.
  • This Microstructures should improve the surface quality of the Do not negatively influence the workpiece and be suitable for this be while the workpiece is pressed against the engraving to take up the printing medium sticking in the engraving and a deformation due to local build-up of the pressure medium counteract between engraving and workpiece.
  • the microstructures Microstructures
  • the surface structure of the workpiece to influence them in a targeted manner so that e.g. a more even Forming takes place and better adhesive properties for one subsequent coating can be guaranteed.
  • the microstructures should have a dimension in the Order of magnitude from one molecule of the printing medium to approx. Have 100 ⁇ m width and 100 ⁇ m depth / or height.
  • the Microstructures can have any shape and in equal or different distances from each other be arranged or merge and e.g. Line structures, meandering structures or form punctiform structures. According to the spec of the component, the microstructures on the engraving over the whole area or only at defined positions (e.g. in Radii elements), if only on these There is a risk of deformation, or if only on certain surface areas of the workpiece special surface properties (e.g. adhesive and Friction properties) are desired.
  • Figure 1 shows an internal high pressure forming tool with an upper tool half 1a and a lower tool half 1b, which are movable relative to each other for loading and removing the workpiece.
  • both tool halves 1a, 1b are closed and have an engraving 2.
  • the internal high-pressure forming tool is the not yet formed tubular workpiece W.
  • Feed cylinders 3 act on both pipe ends of the workpiece, which ensure that the material continues to flow during the internal high-pressure forming and at the same time seal the workpiece W.
  • a pressure medium feed line 4 leads to the feed cylinder 3 shown on the left in FIG. 1, via which the pressure medium is fed to the workpiece W, for example by means of a hydraulic unit 5.
  • the wall of the workpiece then presses against the inner contour of the tool and thus against the engraving 2 of the hydroforming tool.
  • the engraving is complete or only provided with microstructures in the areas in which the liquid pressure medium can collect before inserting the next workpiece (marked separately).
  • the tool also has a split shape (see FIG. 2).
  • the upper tool half 1a has, for example, the engraving 2 and the lower tool half 1b has a pressure chamber 6, in which the pressure medium supply 4 opens.
  • the workpiece W is clamped in the form of a single blank between the closed tool halves 1a and 1b.
  • the sheet (workpiece W) lies against the engraving 2 of the upper tool half 1a.
  • the engraving can be provided with microstructures which either avoid an unwanted deformation of the workpiece due to the active medium enclosed between the engraving and the workpiece and / or specifically influence the surface quality of the workpiece.
  • Fig. 3 is a tool part 1a with an engraving 2 acc.
  • Fig. 2 shown, in which in the corner areas Microstructures M are arranged.
  • the surface of the engraving 2 has the smallest depressions in the form of Microstructures M into which the engraving 2 pent active medium can escape during the forming process, so that a perfect surface of the workpiece W is guaranteed.
  • the microstructures are here lined up in a meandering pattern.
  • FIG. 5 is a circular arrangement of the Microstructures M are shown which e.g. at a deepest Point of an engraving 2 may lie.
  • microstructures M can for example by laser machining, electroerosive Machining, ultrasonic erosion, scoring, etching or by other suitable ablation procedures.
  • electroerosive Machining e.g. by electroerosive Machining
  • ultrasonic erosion e.g. by ultrasonic erosion
  • scoring e.g. by etching
  • etching e.g. by lithography
  • the arrangement of the microstructures can take the form of a cross, a line, a circle, a meander or in other structures or shapes. 4 shows two variants with meandering and circular lines of the microstructures.
  • the microstructures avoid the formation of bubbles, since the active medium can escape into the microstructures. It is also possible for the first time to create a lubricant depot with these microstructures in areas of high wear and thus to significantly reduce wear. In the case of very lubricated workpieces, this lubricant depot is filled up, for example, and if the parts are not lubricated enough, the lubricant is released by the pressure when the component wall is pressed against the engraving.
  • the emergency running properties of the tool are thus surprisingly significantly improved. Furthermore, lubricants can be saved on the workpiece. A defined influence on the material flow is also possible, for example, by roughening the engraving with the microstructures. The microstructures can be used to produce a workpiece surface with more favorable adhesive properties for a subsequent coating of the workpiece.
  • the size of the microstructures should preferably be between 10 and 100 microns are around this not to the To make the workpiece surface visible.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Pens And Brushes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (9)

  1. Gravure d'outil, pour outil de formage par fluide sous pression, l'outil présentant une amenée (4) du fluide sous pression et une gravure (2) correspondant au contour final désiré de la pièce (W),
    caractérisée en ce que
    la gravure (2) est munie de microstructures (11).
  2. Gravure d'outil, selon la revendication 1,
    caractérisée en ce que
    les microstructures (M) n'exercent pas d'influence négative sur la qualité superficielle de la pièce (W) et sont capables,
    pendant le pressage de la pièce (W) sur la gravure (2) au cours du formage par haute pression interne, d'accueillir le fluide sous pression et de s'opposer à une déformation en retenant localement le fluide entre la gravure (2) et la pièce (W),
    et/ou
    d'influencer de manière orientée les qualités d'adhérence de la pièce et/ou
    d'accueillir des agents lubrifiants et de servir de dépôt pour ces agents,
    et/ou
    d'agir sur le fluage de la matière de la pièce lors du formage.
  3. Gravure d'outil selon la revendication 1 ou 2,
    caractérisée en ce que
    les microstructures (M) présentent une dimension, une forme et une disposition définies.
  4. Gravure d'outil selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    les microstructures (M) ont une dimension dont l'ordre de grandeur est celui d'une molécule de fluide sous pression allant jusqu'à 100µm en largeur, 100µm en profondeur et 100 µm en hauteur.
  5. Gravure d'outil selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    les microstructures (M) sont disposées sur la gravure (2), sur toute la surface de celle-ci ou en des endroits définis.
  6. Gravure d'outil selon la revendication 5,
    caractérisée en ce que
    les microstructures (M) sont disposées
    dans les zones de la gravure où s'accumule le fluide sous pression et où de ce fait des déformations de la pièce (W) peuvent se produire et/ou
    dans les zones de la gravure où la structure superficielle de la pièce (W) doit être influencée de manière ciblée,
    et/ou
    dans les zones de la gravure où se produit une forte usure
    et/ou
    dans les zones de la gravure où il faut agir sur le fluage de la matière.
  7. Gravure d'outil selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    les microstructures (M) sont disposées côte à côte en série et ont une forme droite, circulaire ou à méandres.
  8. Gravure d'outil selon l'une quelconque des revendications 1 à 7,
    caractérisée par
    des microstructures (M) obtenues par usinage au laser, par électroérosion, par érosion ultrasonore, par rayure gravure ou autre procédé d'enlèvement de matière.
  9. Gravure d'outil selon l'une quelconque des revendications 1 à 6,
    caractérisée par
    des microstructures obtenues par lithographie ou autre procédé d'application.
EP99113024A 1998-07-24 1999-07-06 Outillage de formage gravé pour formage par fluide sous pression Expired - Lifetime EP0974411B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833550A DE19833550B4 (de) 1998-07-24 1998-07-24 Umformwerkzeug zum Umformen mittels eines Druckmittels
DE19833550 1998-07-24

Publications (2)

Publication Number Publication Date
EP0974411A1 EP0974411A1 (fr) 2000-01-26
EP0974411B1 true EP0974411B1 (fr) 2001-11-14

Family

ID=7875319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113024A Expired - Lifetime EP0974411B1 (fr) 1998-07-24 1999-07-06 Outillage de formage gravé pour formage par fluide sous pression

Country Status (5)

Country Link
US (1) US6286351B1 (fr)
EP (1) EP0974411B1 (fr)
AT (1) ATE208667T1 (fr)
DE (2) DE19833550B4 (fr)
ES (1) ES2169581T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6532784B1 (en) * 1998-09-04 2003-03-18 Henkel Corporation Mechanical hydroforming with improved lubrication
DE19937707C2 (de) * 1999-08-10 2003-03-27 Baerlocher Gmbh Werkzeug-Oberflächen mit definierter Mikrostruktur zur Abweisung von Ablagerungen
WO2002022304A1 (fr) * 2000-09-13 2002-03-21 Baerlocher Gmbh Surfaces d'outils ayant une microstructure definie permettant l'elimination des depots
US20040129052A1 (en) * 2003-01-06 2004-07-08 Krajewski Paul Edward Method of reducing cycle time for metal forming
DE102004041024B4 (de) * 2004-08-25 2006-07-06 Thyssenkrupp Steel Ag Verfahren und Vorrichtung zum Herstellen eines längsnahtgeschweißten Hohlprofils
DE102008002736A1 (de) * 2008-06-27 2009-12-31 Robert Bosch Gmbh Vorrichtung zur Bearbeitung einer Platte zu einem nanostrukturierten Formteil und ein Verfahren zur Herstellung desselben
KR20110042435A (ko) * 2009-10-19 2011-04-27 삼성전자주식회사 패턴형성장치 및 이를 이용한 패턴형성방법
DE102010037958B4 (de) 2010-10-04 2012-04-26 Matthias Schmidt Verfahren zur Herstellung eines Umformwerkzeuges für Dichtungen oder Einzellagen von Dichtungen, Umformwerkzeug, Dichtung und Presse
CN104511529A (zh) * 2013-09-30 2015-04-15 国立高雄第一科技大学 具表面微结构的弯形模具及其弯形冲头
DE102014000944B3 (de) * 2014-01-24 2015-04-02 Frauenhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Herstellung mehrskalig oberflächenstrukturierter Hohlprofile mittels mediengestützten Umformens
CN113231526B (zh) * 2021-05-28 2023-03-24 威海盈创金属成形科技有限公司 一种大口径筒形件内压自动成形装置及方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581913A (en) * 1983-07-27 1986-04-15 Luster Finish, Inc. Method for improving the release and finish characteristics of metal stamping dies
JPH04294831A (ja) * 1991-03-26 1992-10-19 Kawasaki Steel Corp プレス用金型及び金型の粗面加工方法
JP3212433B2 (ja) * 1993-12-28 2001-09-25 株式会社不二機販 金属成品の摺動部の摩耗防止方法
US5823032A (en) * 1994-04-07 1998-10-20 The Boeing Company Prethinning for superplastic forming
US5649438A (en) * 1994-06-14 1997-07-22 Owens-Corning Fiberglas Technology, Inc. Method and apparatus for pneumatic forming of thin foil materials
DE4434799A1 (de) * 1994-09-29 1996-04-04 Smg Sueddeutsche Maschinenbau Verfahren und Vorrichtung zum Umformen von Metallblech
DE4436437C2 (de) * 1994-10-12 1996-09-05 Hde Metallwerk Gmbh Verfahren zum hydrostatischen Umformen von insbesondere ebenen Blechen aus kaltumformbarem Metall und diesbezügliche Vorrichtung zur Durchführung des Verfahrens
DE19535870C2 (de) * 1995-07-24 2002-07-11 Blz Gmbh Verfahren zum Herstellen von schalenförmigen Hohlstrukturen aus gedoppelten Blechzuschnitten mittels Innenhochdruckumformen
US5671628A (en) * 1995-12-18 1997-09-30 General Electric Company Laser shock peened dies
DE29617276U1 (de) 1996-10-07 1998-02-05 Sachsenring Automobiltechnik GmbH, 08058 Zwickau Kugelgelenk
DE19705244A1 (de) * 1997-02-12 1998-08-13 Huber & Bauer Gmbh Umformvorrichtung
WO1998051425A2 (fr) * 1997-05-12 1998-11-19 Dana Corporation Procede d'hydroformage d'un constituant de chassis de vehicule

Also Published As

Publication number Publication date
DE19833550A1 (de) 2000-02-03
EP0974411A1 (fr) 2000-01-26
DE59900418D1 (de) 2001-12-20
US6286351B1 (en) 2001-09-11
ATE208667T1 (de) 2001-11-15
DE19833550B4 (de) 2005-10-27
ES2169581T3 (es) 2002-07-01

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