DE2055068A1 - Process for spatial and temporal control of the friction between material and tools in deep and stretch forming machines using air cushions - Google Patents
Process for spatial and temporal control of the friction between material and tools in deep and stretch forming machines using air cushionsInfo
- Publication number
- DE2055068A1 DE2055068A1 DE19702055068 DE2055068A DE2055068A1 DE 2055068 A1 DE2055068 A1 DE 2055068A1 DE 19702055068 DE19702055068 DE 19702055068 DE 2055068 A DE2055068 A DE 2055068A DE 2055068 A1 DE2055068 A1 DE 2055068A1
- Authority
- DE
- Germany
- Prior art keywords
- air
- friction
- workpiece
- cushion
- deep
- 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
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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
Description
Patentbeschreibung: Verfahren zur räumlichen und zeitlichen Steuerung der iteibung zwischen Werkstoff and Werkzeugen bei Tief- und Streckziehmaschiiien durch Luftpolster.Patent description: Method for spatial and temporal control the friction between material and tools in deep and stretch drawing machines through air cushions.
Die Erfindung betrifft ein Verf-iren zur räumlicher iind zeitlichten Steuerung der Reibung zwischen Werkstoff und Niederhalter bz«. zwischen Werl;stoff und Zieh- bzw. Streckwerkzeugen. Die zeitlich und räumlich steuerbare Reibung ermöglicht ein optimales Nachflie@en des tiefzuziehenden Materials, sodaß auch schwierige Formen ohne Wellenbildung und Aufreißgefahr tiefgezogen werden können.The invention relates to a method for spatial and temporal Control of the friction between the material and the hold-down device bz «. between Werl; stoff and drawing and stretching tools. This enables friction to be controlled in terms of time and space an optimal flow of the deep-drawn material, so that even difficult shapes can be deep-drawn without the formation of waves or the risk of tearing.
i;s ist belcamlt, daß durch Schrnierung, Auflegen von Kunststofffolien oder durch Aufrauhen an bestimmten stellen die Reibung räumlich und durch Veränderung der Niederhaltekraft im Ablauf des Tiefziehvorganges zeitlich beeinflußt werden kann.i; s is belcamlt that by wrapping, laying on of plastic sheeting or by roughening certain places the friction spatially and by change the hold-down force in the course of the deep-drawing process can be influenced over time can.
Es ist auch bekannt, daß die henntnisse der Reibungskoeffizienten nicht genügen, sondern erst anhand der nach der Umformung vorliegenden Oberflächenstruktur der Einsatz geeigneter Schmiermittel beurteilt werden kann.It is also known that the knowledge of the coefficient of friction are not sufficient, but only on the basis of the surface structure that is present after the forming the use of suitable lubricants can be assessed.
Die oben genannten Verfahren schließen die zeitliche Steuerung der Reibung an den Werkzeugen aus. Außerdem erfordern sie für jeden Tiefziehvorgang eine besondere Vorbereitung (Folien einlegen, schmieren. aufrauhen des Niederhalters und Niederhalterings). Die einzelnen Parameter (Schmierung. Folie, Rauhigkeit) sind in ihrer Größe nur schwer dimensionierbar.The above procedures include the timing of the Friction on the tools. They also require for every deep drawing process special preparation (insert foils, lubricate, roughen the hold-down device and hold-down rings). The individual parameters (lubrication, foil, roughness) are difficult to dimension in their size.
Der brfindung liegt dei Aufgabe zugrunde, daß beim Tiefzichen schwierige Formen schneller beherrscht bzw. erm glicht werden, sodaß die Vorbereitungszeit uiid die FertigunX,szeit wesentlich verkürzt werden.The invention is based on the task that the deep drawing is difficult Shapes can be mastered or made possible faster, so the preparation time uiid the production time can be shortened considerably.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß über kleine Luftdüsen zwischen Tiefziehwerkstück (z. B. Blech oder PVC-Platte) und Niederhalter baw. patrize und Stempel Luftpolster erzeugt werden, die die gleitende Reibung teilweise oder ganz aufheben können und durch Steuerung des Luftstromes in den luftdüsen zeitlich und örtlich die gleitende Reibung in ihrer Höhe beliebig einstellbar ist.This object is achieved in that over small Air nozzles between deep-drawn workpiece (e.g. sheet metal or PVC plate) and hold-down device baw. Male and female stamps air cushions are generated, which partially reduce the sliding friction or can be canceled entirely and timed by controlling the air flow in the air nozzles and the sliding friction can be adjusted locally in terms of its level.
Dabei ist am Niederhalter zu berücksichtigen, daß die Oberfläche zur Aufnahme des Luftpolsters geringfügig verformbar ist.It must be taken into account on the hold-down device that the surface is Recording of the air cushion is slightly deformable.
Die nit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß bei einer Erprobung eines Tiefziehvorganges der optimale Heibungsverlauf an 'iederlalter und Werkzeug schnell eingestellt werden kann und daß bei einer Produktion die Fertigungszeit eriieblich vermindert wird, nachdem wiederkehrende Vorarbeiten wie Einlegen von Folien entfallen.The advantages achieved by the invention are in particular: that when a deep-drawing process is tested, the optimal heating process begins 'iederlalter and tools can be adjusted quickly and that in a production the production time is reduced considerably after recurring preparatory work such as inserting foils are omitted.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702055068 DE2055068A1 (en) | 1970-11-09 | 1970-11-09 | Process for spatial and temporal control of the friction between material and tools in deep and stretch forming machines using air cushions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702055068 DE2055068A1 (en) | 1970-11-09 | 1970-11-09 | Process for spatial and temporal control of the friction between material and tools in deep and stretch forming machines using air cushions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2055068A1 true DE2055068A1 (en) | 1972-05-18 |
Family
ID=5787575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19702055068 Pending DE2055068A1 (en) | 1970-11-09 | 1970-11-09 | Process for spatial and temporal control of the friction between material and tools in deep and stretch forming machines using air cushions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2055068A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1852239A3 (en) * | 2006-05-04 | 2011-03-02 | K1 GmbH | Method for creating a three dimensional freeform surface with haptically and/or optically observable microstructures |
-
1970
- 1970-11-09 DE DE19702055068 patent/DE2055068A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1852239A3 (en) * | 2006-05-04 | 2011-03-02 | K1 GmbH | Method for creating a three dimensional freeform surface with haptically and/or optically observable microstructures |
EP2345525A3 (en) * | 2006-05-04 | 2012-10-17 | K1 GmbH | Method for creating a three dimensional freeform surface with haptically and/or optically observable microstructures |
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