EP0927645B1 - Appareil et méthode de traitement d'une plaque d'impression en creux - Google Patents

Appareil et méthode de traitement d'une plaque d'impression en creux Download PDF

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Publication number
EP0927645B1
EP0927645B1 EP19980115589 EP98115589A EP0927645B1 EP 0927645 B1 EP0927645 B1 EP 0927645B1 EP 19980115589 EP19980115589 EP 19980115589 EP 98115589 A EP98115589 A EP 98115589A EP 0927645 B1 EP0927645 B1 EP 0927645B1
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EP
European Patent Office
Prior art keywords
rotary tool
oscillation
transducer
rotary
steel blade
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
EP19980115589
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German (de)
English (en)
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EP0927645A1 (fr
Inventor
Max Dätwyler
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.)
Daetwyler Global Tec Holding AG
Original Assignee
MDC Max Daetwyler AG Bleienbach
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
Priority claimed from EP98810001A external-priority patent/EP0927646A1/fr
Application filed by MDC Max Daetwyler AG Bleienbach filed Critical MDC Max Daetwyler AG Bleienbach
Priority to EP19980115589 priority Critical patent/EP0927645B1/fr
Publication of EP0927645A1 publication Critical patent/EP0927645A1/fr
Application granted granted Critical
Publication of EP0927645B1 publication Critical patent/EP0927645B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces

Definitions

  • the invention relates to a device for processing a gravure form according to the preamble of claim 1.
  • the invention further relates to a method for Processing of a gravure form according to the generic term of Claim 11.
  • Document EP-A-0 808 723 discloses both Device according to the preamble of claim 1 as well as a method according to the preamble of claim 11.
  • the gravure forms used in gravure printing are usually designed as gravure cylinders.
  • Such a gravure cylinder usually has one made of copper, zinc or a corresponding alloy existing, cylindrical metal layer in whose Outer layer depressions are engraved, which the ink is determined to be included. After this It will be engraved based on the metals used relatively soft cylinder surface with a usually electroplated, more wear resistant Metal layer coated, which is usually made of chrome consists. After the printing process is complete, the Gravure cylinder for a next engraving process prepared by removing at least the chrome layer becomes.
  • An object of the invention is a method to remove the more wear-resistant metal layer Intaglio form, in particular an intaglio cylinder create that is reliable and inexpensive.
  • Die Subclaims 2 to 10 relate to further advantageous embodiments of the inventive Contraption.
  • Die Subclaims 12 to 15 relate to further, advantageous embodiments of the inventive Process.
  • a turning tool is preferably used as the turning tool extensively used a cutting edge.
  • the turning tool is at least while cutting through the converter a high-frequency vibration, the exciting vibration preferably between 1 kHz and 100 kHz.
  • the method according to the invention has the advantage on that the chrome layer of the gravure cylinder on can be removed very gently.
  • the accruing Chips which are chrome and zinc respectively Zinc alloy are recyclable. It fall no polluted waste water.
  • the turned rotogravure cylinders a homogeneous Surface structure in which a new engraving or to which a new metal layer is applied can.
  • the swinging of the turning steel or the turning steel cutting edge has a particularly advantageous effect when turning off one Gravure cylinder, because that is the wasted material in the form of relatively short chips.
  • An essential one The advantage is that the relatively short chips fall off the cylinder in such a way that the turned one Surface is not damaged. Would when turning long chips are generated, there is a risk that they touch and damage the turned surface.
  • Such damage to the surface of a Gravure cylinder represents a considerable financial damage because for a four-color print a set of four gravure cylinders with the same Diameter is required. If the damage to the Surface would be removed by turning, so would have to also the surfaces of the remaining three Gravure cylinders are turned off.
  • the swinging of the turning steel also has an advantageous effect on the service life of the turning steel cutting edge.
  • the device according to the invention or the The method according to the invention is also advantageous suitable to process gravure cylinders, which one Outer layer made of copper or a copper alloy have which with a chrome layer or other hard layer is covered. Also at such gravure cylinders causes the vibrating Turning steel relatively short chips, so no danger there is damage to the turned off chips Cause surface.
  • the chips are also advantageously recyclable.
  • the controllable converter is preferably a configured piezoelectric transducer, whereby also other transducers generating a vibration are suitable are, for example, a hydraulic or mechanical excited converter.
  • the converter is preferably aligned in such a way Holding device arranged that the one longitudinal direction having turning tool to a cross, in particular vibration perpendicular to the longitudinal direction is stimulable.
  • An additional converter could also be arranged such that an in Vibration running in the longitudinal direction of the turning tool can be generated on this.
  • Fig. 1 shows a longitudinal section through a Holding device 3, which has a recess for receiving of the turning tool 1 designed as turning tool 1 having.
  • the turning tool 1 is screwed 3b against the opposite side of the screws 3b Bracket 3a pressed and thereby held firmly.
  • the Turning tool 1 is to the right of the one labeled 3c Place over the entire length section firmly on the bracket 3a, whereas the to the turning tool 1 facing surface of the bracket 3a left of Position 3c backs away so that there is a gap between the Bracket 3a and the turning tool 1 are not in contact, and the turning tool 1 can swing freely.
  • Point 3c longitudinal section could, however, also Have recesses formed such that the Turning tool 1 only firmly on the partial length sections Bracket 3a rests, these partial length sections in a preferred embodiment opposite the Screws 3b arranged, and with respect to the longitudinal direction 1c dimensioned approximately the same size as the screws 3b are designed.
  • the screws 3b and the partial length sections are such arranged in the longitudinal direction 1c that the Turning steel cutting edge 1a of turning tool 1 with as much as possible large vibration amplitude is excitable, what is particularly achievable in that the screws 3b or the partial length sections on those Are arranged at which the turning tool 1 in Longitudinal direction 1c has a vibration node.
  • a piezoelectric transducer 5 is in the holder 3a arranged and has an operative connection to the turning tool 1 on, in order to 1c in the direction of vibration Transfer alternating force and thereby to a To stimulate vibration.
  • the converter 5 comprises several plate-shaped, stacked one on top of the other piezoelectric elements 5e.
  • the piezoelectric Elements 5e are on both sides of a clamping part 5c, 5d limited, these clamping parts 5c, 5d by a Screw 5f held together or mutually are led.
  • the clamping part 5c is over a plate 5b connected with an adjusting screw 5a.
  • bracket 3a In the bracket 3a is a threaded bore for receiving the Adjustment screw 5a is provided so that the mutual Position of converter 5 and bracket 3a by turning the Adjusting screw 5a is adjustable in the direction 1c.
  • the Piezoelectric elements 5e are about electrical Conductors 7a, 7b, which are components of the electrical Cable 7 are, with a not shown Control device electrically connected.
  • the turning tool 1 has a cutting edge 1a at its tip.
  • the Turning steel has one by its longitudinal expansion determined longitudinal direction 1b.
  • a sensor for detecting can be on the holding device 3 the vibration amplitude of the turning tool 1 or its turning steel cutting edge 1a arranged his.
  • a piezoelectric Element 5e of the transducer 5 for measuring the Vibration amplitude used in this piezoelectric element 5e compared to the rest piezoelectric elements 5e electrically isolated arranged as a sensor, the sensor value derived with the help of an electrical cable and a Amplifier is supplied.
  • the piezoelectric elements 5e experience this one Linear expansion or a reduction in length, which is transmitted from the converter 5 to the turning tool 1.
  • the converter 5 generated alternating force in a perpendicular to Longitudinal direction 1b in the direction 1c Turned steel 1 initiated.
  • This alternating force could also in another, transverse to the longitudinal direction 1b Direction initiated.
  • the holding device 3 can also several, in the same or in different Direction acting on the clamped turning tool 1 Have converter 5.
  • the Holding device several holders 3a for holding each of a turning tool 1, at least one the rotary steels 1 vibrated by the converter 5 can be.
  • the drive frequency of the converter 5 selected such that the turning tool 1 with its resonance frequency or one Harmonics of it is excited.
  • either Drive frequency of the converter 5 selected accordingly be, or the turning tool 1 can accordingly be designed, for example by its Dimensioning or by an appropriate Choice of material or elasticity of the turning tool.
  • the resonance frequency of the turning tool 1 is due to the Arrangement of the screws spaced in the longitudinal direction 1b 3b can be influenced.
  • Fig. 2 shows a section of a cross section a gravure cylinder 20 with a base body 21, which is made of a suitable material such as Steel, aluminum or plastic.
  • Base body 21 On this Base body 21 is a first in a known manner Metallic layer 22 applied, for example made of copper, zinc, a copper alloy or one Zinc alloy is made.
  • This first metallic layer 22 is coated with a more wear-resistant layer 23, which, for example, made of chrome or another Hard material layer exists.
  • This more wear-resistant Layer 23 has depressions on its surface Recording ink on. After a completed one Printing process, the more wear-resistant layer 23 to be removed again to insert a new print pattern into the Engrave the surface.
  • FIG. 2 shows a cross section through the gravure cylinder 20 represents, the conveying direction F of the turning tool 1 with respect to the view according to FIG. 2 vertically upwards.
  • the rotating gravure cylinder 20 leads with respect 2 is an upward view Rotary motion so that the machined Circumferential section 24 of the gravure cylinder already is turned and a cylindrical surface having.
  • the holding device 3 shown in FIG. 2 is identical to that shown in Figure 1 Holding device 3, which is why only the most important parts Reference numerals are provided.
  • the converter 5 generates one high-frequency alternating force on the turning tool 1, so that this vibrates in the direction of movement 1c becomes. This direction of movement 1c runs perpendicular to Rotation axis of the gravure cylinder 20 and perpendicular to Direction of movement F of the holding device 3 or parallel to the cutting direction of the Turning tool.
  • the converter 5 could, however, also be used in this way the holding device 3 may be arranged that the Turning tool 1 is vibrated, the Movement direction 1c in a vertical to that according to FIG. 2 viewing plane runs.
  • This Direction of movement 1c would thus be parallel to the axis of rotation of the gravure cylinder 20, or parallel to Direction of movement F of the holding device 3, or perpendicular to the cutting direction of the Turning steel cutting edge 1a run.
  • the frequency the alternating force is in the range between 1 kHz and 100 kHz, being a stimulating electrical signal for example a sine signal, a square wave signal or also an asymmetrical signal like a sawtooth Signal can be used.
  • the converter 5 could also be arranged such that the turning tool 1 to a in the direction of the Longitudinal direction 1b moving vibration is excited.
  • the Gravure cylinder 20 moved in a direction of movement F. be, wherein the holding device 3 is fixed or one opposite to the direction of movement F. Movement.
  • a tool holder 3 comprises one piezoelectric transducer 5 with piezoelectric Elements 5e, clamping part 5d, plate 5b, screw 5f and Guide sleeve 5g.
  • the converter 5 is opposite Spring and support body 8 arranged, which one Plurality of stacked spring elements 8a includes and a clamping part 8b, which on the Turning tool 1 rests.
  • the clamping body 1d is over the screws 3b releasably firmly with the holding device 3rd connected and via the clamping parts 5d, 8b and elastic support 3c swingably mounted.
  • the Converter 5 is capable of turning tool 1 in Movement direction 1c to vibrate.
  • the turning tool 1 multi-part and consists of two essential parts, the clamping body 1d and one fastened the front of the clamping body 1d Cutting tool holder 1i with cutting tool 1a.
  • the Turning tool holder 1i is over a screw 1e as well as a sleeve 1f with the clamping body 1d connected, with an additional bolt 1g as Protection against rotation is provided.
  • Between the Clamping body 1d and the turning tool holder 1i could an additional, in the longitudinal direction 1b of the Clamping body 1d acting piezoelectric transducer 5 be arranged to the turning steel cutting edge 1a also in to a vibration running in the longitudinal direction 1b offset.
  • Fig. 5 shows an electronic circuit diagram for Control of a piezoelectric transducer 5. From one Control device 10b with display device 10c is turned on Specified setpoint, which via an electrical Line 10i predefined for a control device 10d becomes. This controls via a downstream Preamplifier 10e and a power amplifier 10f via the electrical line 7b, the converter 5, whereby this is vibrated. The vibration of the Transducer 5 or the vibration of the turning tool 1 is detected with a sensor and via the electrical line 7c and the preamplifier 10a of the control device 10b fed.
  • the control device 10b can for example are controlled such that the turning tool 1 or the turning steel cutting edge 1a is as large as possible Vibration amplitude in which the excitation frequency is varied in this way, e.g. in the frequency range between 1 kHz and 100 kHz until a maximum vibration amplitude occurs. Via converter 5 or an additional one The sensor is also the vibration behavior of the Gravure cylinder 20 measurable.
  • the control device 10b can be operated in such a way that when a Predeterminable vibration value at least one of the following machining parameters: speed of the cylinder, Feed speed of the turning tool 1, Vibration amplitude of the turning steel cutting edge 1a, Vibration frequency of the turning steel cutting edge 1a changed is to the vibration of the gravure cylinder 20 too Reduce. Be via a control signal line 10g Control signals, for example, to the rotary drive of the Cylinder forwarded to its speed too change.
  • control loop shown in Fig. 5 is with a A variety of control methods can be controlled such that the machined rotogravure cylinders one if possible has a uniform surface.
  • a piezoelectric element 5e of the transducer 5 can used to control the vibration of the To detect turning tool 1, from this Vibration signal the vibration of the Gravure cylinder 20 can be derived. So with With the help of the transducer 5 the vibration of the Gravure cylinder 20 measurable. Are in the Tool holding device 3 several transducers 5 arranged as shown in Fig. 4, the corresponding vibration in the direction 1c, 1h, and if necessary also in direction 1b.

Landscapes

  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (16)

  1. Dispositif pour traitement d'une plaque d'héliogravure (20), notamment d'un cylindre d'héliogravure, caractérisé en ce qu'il comprend un dispositif de retenue (3) pour un outil de tournage (1) servant à traiter la plaque d'héliogravure (20), ainsi qu'au moins un transducteur commandable (5), notamment un transducteur piézoélectrique, pour la production d'une oscillation agissant sur l'outil de tournage (1).
  2. Dispositif selon la revendication 1, caractérisé en ce que le transducteur (5) est agencé de manière à pouvoir être accouplé rigidement à l'outil de tournage (1).
  3. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le transducteur (5) est disposé en étant aligné dans le dispositif de retenue (3) de telle sorte que l'outil de tournage (1), qui possède une direction longitudinale (1b), peut être activé pour effectuer une oscillation (1c) qui s'étend transversalement et notamment perpendiculairement à la direction longitudinale (1b).
  4. Dispositif selon la revendication 3, caractérisé en ce que deux transducteurs (5) sont disposés en étant alignés sur le dispositif de retenue (3) de telle sorte que deux composantes d'oscillation (1c, 1d), qui sont orientées orthogonalement et s'étendent perpendiculairement à la direction longitudinale (1b), peuvent être produites sur l'outil de tournage (1).
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un transducteur (5) est disposé dans le dispositif de retenue (3) en étant orienté de telle sorte que l'outil de tournage (1) possédant une direction longitudinale (1) peut être excité pour être le siège d'une oscillation dans la direction longitudinale (1b).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'outil de tournage (1) est conçu d'une manière adaptée en rapport avec la fréquence d'oscillation produite par le transducteur (5) et/ou est disposé dans le dispositif de retenue (3) de telle sorte que l'outil de tournage (1) peut être excité de manière à osciller à une fréquence propre.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un capteur servant à détecter l'amplitude d'oscillation de l'outil de tournage (1) ou de son tranchant en acier (1a) est disposée sur le dispositif de retenue (3) et que le capteur est agencé notamment sous la forme d'un élément piézoélectrique, notamment sous la forme d'un élément du transducteur piézoélectrique (5).
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le transducteur (5) peut être entraíné à une fréquence comprise entre environ 1 kHz et 100 kHz.
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la valeur de l'amplitude d'oscillation de l'outil de tournage (1) ou son tranchant en acier (1a) est envoyé à un dispositif de régulation (10b), et que le dispositif de régulation (19b) est agencé pour la commande du transducteur (5) de telle sorte que l'outil de tournage (1) ou son tranchant en acier (1a) possède une amplitude d'oscillation pouvant être prédéterminée, notamment maximale.
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'outil de tournage (1) est formé de plusieurs parties, comprenant un corps de serrage (1d) pouvant être fixé dans le dispositif de retenue (3), ainsi qu'un dispositif (1i) de retenue de tranchant en acier qui est fixé sur le corps de serrage (1d) et comporte le tranchant en acier (1a).
  11. Procédé d'usinage d'une plaque d'héliogravure (20), notamment d'un cylindre d'héliogravure, qui comporte au moins une première couche métallique (22) ainsi qu'une couche (23) qui recouvre la couche précédente et est plus résistante à l'usure que la première couche métallique (22), caractérisé en ce qu'au moins la couche plus résistance à l'usure (23) est usinée au tour avec un outil de tournage (1), qui est amené à osciller par un transducteur (5).
  12. Procédé selon la revendication 11, caractérisé en ce que l'outil de tournage (1) est chargé à une fréquence comprise entre 1 kHz et 100 kHz et que la fréquence est choisie notamment de telle sorte que le tranchant en acier (1a) de l'outil de tournage (1) possède une amplitude d'oscillation maximale.
  13. Procédé selon l'une des revendications 11 ou 12, caractérisé en ce qu'avec le même outil de tournage (1), on réalise simultanément l'usinage au tour de la couche plus résistante à l'usure (23) et d'une zone partielle de la première couche métallique (22) située au-dessous.
  14. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que la couche plus résistance à l'usure (23) est formée par du chrome ou un oxyde métallique et que la première couche métallique (22) est formée de zinc ou d'un alliage de zinc ou de cuivre ou d'un alliage de cuivre.
  15. Procédé selon l'une des revendications 11 à 14, caractérisé en ce que l'oscillation du cylindre d'héliogravure (20) est mesurée notamment au moyen du transducteur (5), et que lors du dépassement d'une valeur d'oscillation pouvant être prédéterminée, au moins l'un des paramètres d'usinage suivants: vitesse de rotation du cylindre, vitesse d'avance de l'outil de tournage (1), amplitude d'oscillation du tranchant en acier (1a), fréquence d'oscillation du tranchant en acier (1a), est modifié pour réduire l'oscillation du cylindre d'héliogravure (20).
  16. Installation d'usinage pour une plaque d'héliogravure (20), notamment un cylindre d'héliogravure, comportant un dispositif selon l'une des revendications 1 à 10 ou fonctionnement avec un procédé selon l'une des revendications 11 à 15.
EP19980115589 1998-01-05 1998-08-19 Appareil et méthode de traitement d'une plaque d'impression en creux Expired - Lifetime EP0927645B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19980115589 EP0927645B1 (fr) 1998-01-05 1998-08-19 Appareil et méthode de traitement d'une plaque d'impression en creux

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98810001 1998-01-05
EP98810001A EP0927646A1 (fr) 1998-01-05 1998-01-05 Appareil et méthode de traitement d'une plaque d'impression en creux
EP19980115589 EP0927645B1 (fr) 1998-01-05 1998-08-19 Appareil et méthode de traitement d'une plaque d'impression en creux

Publications (2)

Publication Number Publication Date
EP0927645A1 EP0927645A1 (fr) 1999-07-07
EP0927645B1 true EP0927645B1 (fr) 2002-10-30

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924713A (en) * 1988-03-14 1990-05-15 Elco Co., Ltd. Transducer to detect force which is applied to machine tool when machining workpiece and its attaching structure
ATE188918T1 (de) * 1996-05-23 2000-02-15 Valerio Rosa Verfahren und maschine zum entfernen von gravuren und chromschichten von tiefdruckzylindern

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