EP0808723A1 - Procédé pour enlever la couche de chrome et les gravures d'un cylindre de gravure et machine pour l'application de ce procédé - Google Patents

Procédé pour enlever la couche de chrome et les gravures d'un cylindre de gravure et machine pour l'application de ce procédé Download PDF

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Publication number
EP0808723A1
EP0808723A1 EP97108377A EP97108377A EP0808723A1 EP 0808723 A1 EP0808723 A1 EP 0808723A1 EP 97108377 A EP97108377 A EP 97108377A EP 97108377 A EP97108377 A EP 97108377A EP 0808723 A1 EP0808723 A1 EP 0808723A1
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EP
European Patent Office
Prior art keywords
smoothing
fixed
chromium
polishing machine
modular
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.)
Granted
Application number
EP97108377A
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German (de)
English (en)
Other versions
EP0808723B1 (fr
Inventor
Valerio Rosa
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.)
ROSA, VALERIO
Original Assignee
Individual
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Filing date
Publication date
Priority claimed from IT96VI000084 external-priority patent/IT1287292B1/it
Priority claimed from IT97VI000036 external-priority patent/IT1292959B1/it
Application filed by Individual filed Critical Individual
Publication of EP0808723A1 publication Critical patent/EP0808723A1/fr
Application granted granted Critical
Publication of EP0808723B1 publication Critical patent/EP0808723B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • B24B5/045—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally with the grinding wheel axis perpendicular to the workpiece axis
    • 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
    • B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving

Definitions

  • the invention concerns a method for removing the chromium plating and the engraving from gravure rollers and a machine suited to applying such a method.
  • gravure rollers consist of a steel cylinder covered with a copper coat galvanically obtained, on which a drawing can be impressed to be reproduced on the paper. On the copper coat a chromium protective covering, which is itself galvanically obtained, is then settled.
  • the cylinder diameter has to be reduced to eliminate the engraving imprinted on the copper coat and such an operation, which is quite difficult as it is well known to those skilled in the art, consists of a first step in which the chromium is submitted to a galvanic treatment for chromium plating removal and a second step in which special machines work the copper coat removing the engraving imprinted on it.
  • Such a method presents the disadvantage of requiring the use of very expensive machines and being divided into two steps, performs quite long working cycles because of the set up time necessary to move the cylinders from the galvanic chromium plating removal plant to the machine tools.
  • the present invention proposes to overcome such disadvantages.
  • the object of the present invention is to realize a method and a machine suited to put into effect such a method, which allows the working of gravure rollers, obtaining:
  • said contrast bodies are diamond granules inserted on a disk surface fixed to a working operative head which makes it turn.
  • Each diamond granule forces the chromium covering against the down below copper coat that, being stronger, collapses elastically causing the chromium breaking that is more rigid.
  • the chromium is, in this way, shattered into many pieces and can be easily torn up from the down below copper coat to which is galvanically secured.
  • two disks are used and one mainly performs the chromium breaking whereas the second one performs even the engraving removal.
  • the down below copper coat is smoothed by the second rotating disk provided with abrasive elements belonging to the known technique.
  • the method of the invention is applied using a modular smoothing - polishing machine comprising a basement which includes a support and a rotating group of a cylindrical body to be smoothed and a lateral surface working group of said cylindrical body, said working group comprising:
  • the supporting and rotating group of the cylindrical body to be worked includes a couple of opposed tailstocks that support the cylinder to be worked and a motorization group fixed to one extremity of said cylinder suited to put it under rotation around the horizontal axis. Said tailstocks and said motorization group are supported by the basement of the machine.
  • Said sliding means which allow the shifting of said operating heads, are formed by slides which cooperate with said handling means consisting of ropes connected to said sliding means and wound on drums and transmission pulleys.
  • the operative heads are connected to the frame by kinematic elements consisting of closed jack chains which engage with sprocket wheels supported by a central structure which assures on the same frame. At least one of said sprocket wheels, which engage with each chain, is connected with an engine which makes it turn on clockwise or anticlockwise direction according to the operative needs.
  • the oscillation group, with which each operative heads is equipped is a mechanic-pneumatic group operating by an engine, the rotation of which is controlled by an electronic system with amperometric control, suited to change the position of the rotating disk which present an abrasive surface against the working surface and suited to maintain the pressure constant during the machining.
  • the method of the invention is applied using an operating head 1 of an operating machine, object of the invention too and visible in Fig. 2, where this is indicated as a whole with 200, by which it can be carried out the machining of the surface of the gravure roller 2 which is made turn around its longitudinal axis 3 by rotating means.
  • a first disk 4 is applied to the operating head 1, this disk being formed, as it can be observed, by a small plateau which is made turn around the longitudinal axis 10 of said operating head.
  • Said small plateau 4 as it can be observed in the detail of Fig. 2, is provided with a plurality of contrasting bodies 41 which are formed by a plurality of diamond granules applied to said disk 4.
  • said contrasting bodies 41 can be even made of a plurality of synthetic or artificial granules for instance boron carbide or similar material which present a lower hardness than the diamond but close to it.
  • the cylinder 2 as it can be observed in the detail of Fig. 2, is formed by a shell 21, preferably made of steel, on which a copper coat 22 that supports the engraving is galvanically settled and it is covered by a protective chromium coat 23.
  • each contrasting body 41 forces the protective chromium covering 23 and breaks it because of the elastic collapsing of the down below copper coat 22. It is just the collapsing of said copper coat 22 and the harness of the chromium covering which allow the diamond granules 41 to break the chromium, crumbling it in very little pieces 230 without abrading it, but detaching it from the copper and moving it away.
  • the engraving present in the copper coat is eliminate too.
  • the use of another rotating disk may be necessary to obtain the complete removal of the engraving and of the possible chromium residuals.
  • the copper surface itself After the chromium and copper engraving removal, the copper surface itself, indicated with 222 in Fig. 3, appears lightly wrinkled and is smoothed by the use of other rotating disks belonging to respective operating heads.
  • FIGs. 4 and 5 The operating machine which realizes the above described method of the invention and object of the invention too, is represented in Figs. 4 and 5 where it is indicated as a whole with 200 and comprises a basement 202 which includes a support and a rotating group 3 of a cylindrical body to be worked 2 and a smoothing group, indicated as a whole with 5, of the surface 41 of said cylindrical body 2.
  • Said supporting and rotating group 3 consists of a couple of tailstocks 40 which support the extremities of said cylinder to be smoothed 2 which is made turn by a motorization group 42.
  • the surface 441 of said cylinder body 2 is maintained wet by a wetting parallel cylinder which gets the refrigerating liquid from a basin 32 which assures on the basement 202.
  • the lateral surface 441 of said cylindrical body 2 is smoothed by said smoothing group indicated as a whole with 5 which, as it can be observed even in Fig. 3, is formed by a plurality of operating heads 1.
  • Said operating heads 1 are connected to kinematic elements more visible on the detail of Fig. 3, said elements belonging to a central structure 50 supported by a frame 51 which assures on supporting elements formed by a couple of vertical rods 35 located at its extremities and fixed to said basement 202.
  • Said kinematic elements visible in Fig. 3 comprise sprocket wheels 52 spaced out among them and located on two, substantially horizontal and parallel planes where a chain 53 is placed in connection of each plane on which such sprocket wheels 52 lie.
  • a chain 53 is connected as a ring between at least two of said sprocket wheels 52 with which it is engaged and at least one of those is connected with rotation means suited to make it turn to obtain the movement of said chain with which it is engaged.
  • Said operating heads 1 are fixed to said chains 53 each one by a support 81 and are provided with wheels 91 sliding on tracks 92 realized in the central structure 50 and which have the function of supporting each operating head and of driving it when the chains 53 are put into action.
  • each support 81 is provided with driving means 83 which include an engine 82 and permit the vertical shifting along the axis 84 of the support 81 when said engine 82 is put into vertical alternate movement by an oscillation group indicated as a whole with 8 and supported by the same support 81.
  • the frame 51 is vertically and horizontally moved by sliding means which connect it to each vertical rod 35 and which comprise, as it can be observed in Figs. from 7 to 10:
  • moving means which comprise:
  • said engine 376 it can be observed in Fig. 10 that it is fixed to said plate 71 by a bracket 171 and so it is fixed to the frame 51. Moreover, said bracket 171 supports a shaft 174 passing inside a tubular element 274 with the interposition of a spring 374 coaxial to said shaft 174, wherever said shaft 174 and said tubular element 274 are transversally placed to the frame 51.
  • a plate 474 fixed to the frame is located on the opposite side of the engine 376 and contrasts against the spring 374. When the pull of the rope 176 moves the frame 51 in the direction of 251, the plate 474 presses the spring 374 and its elastic recovery allows the coming back of the frame 51 according to the moving direction 151 opposite to the direction 251, when the rope 176 is released.
  • the rotating disks 4 are then aligned on a level 162 tangent to the surface 441 to be smoothed, as it can be observed in Fig. 12, and then in contact with the surface to be worked as it can be observed in Figs. 13 and 14.
  • each operating head 6 The engine 82 of each operating head 6 is switched on, so that the rotating disk 4 of each head starts the working while at the same time motorizing means, not represented, put in rotation the sprocket wheel 52 which by the chain movement 53 move all the operating heads 1 according the longitudinal direction, parallel to the axis 45 of the cylinder 2.
  • This cylinder is made turn around its own axis 45 by the motorization group 42 and it is worked on its whole length and on its whole lateral surface.
  • the action of the first rotating disk 4 is all-important and eventually even the action of the second one, which enter in contact with the surface to be worked and, operating as it has been already described, realize the breaking of the chromium coat causing the keeping away not by abrasion similar to the one which happens in the machine tools of known technique but instead for breaking which cuts it into pieces 230 without abrading it.
  • the rotating disks which are subsequent to the first one, are provided with abrasive means which have an abrasive finishing action.
  • each rotating disk 4 is even vertically moved in an alternate way , up and down against the working surface 441 by the already said oscillation group, indicated as a whole with 8, with which each operating unit 1 is equipped.
  • oscillation group has a fundamental function in the smoothing action of the cylinder and it allows to realize a cylindrical surface substantially free from depressions as it allows to maintain a constant pressure of the rotating disks 4 against the surface to be smoothed 441.
  • Each oscillation group 8, as it can be observed in Figs. 16, 17, 18 and 19, comprises the already said pneumatic cylinder 100 whose stem 109 is fixed to said engine 82 and whose body 108 is fixed by the bracket 111 to the structure 81 fixed to the chains 53 and which support the engine 82.
  • the engine 82 absorbs more current because of the greater hardness of the cylinder to be smoothed in that paint that require higher abrasive power from the abrasive surface 41 of the disk 4. This higher absorption of current is noticed by an amperometric card belonging to a control group 300, visible in Fig. 4, whereas the relative absorption of the current is indicated on the display 301.
  • a plurality of digital displays are available, each one connected by an amperometric card to the engine 82 with which a specific operating unit 1 is equipped.
  • the pneumatic cylinder 100 presents the body 108 provided with a female thread 110 with which a screw 113 is coupled belonging to an engine 114 fixed by a square 112 to the same bracket 111.
  • the body 108 of the pneumatic cylinder 100 is integral with the engine 82 by a pneumatic auxiliary cylinder 115 which is provided with a first connecting element 116 which contrasts a second connecting element 117 fixed to a plate 118 which is fixed to the engine itself 82.
  • Said connecting means 116 and 117 are formed by a plurality of metallic points fixed to a support suited to realize mutual friction when they are coupled, in such a way to avoid relative sliding among the members of the own system.
  • the system reacts with a signal sent by the control amperometric card to the engine 114, acting it and putting up or down, according to the situations, the whole engine 82 and changing in this way the contact between each disk 4 and the surface 441 of the cylinder 2 under working.
  • the chromium and the engraving removal, the polishing of the copper coat are provided with the same machine obtaining a global reduction of the cycle time.
  • the working method of the invention results in this way faster and cheaper than the methods of the known technique.
  • the machine that realizes the method of the invention allows to obtain a surface quite cylindrical, quite polished and free from waving, because of the presence in each operating unit of the oscillation group that during the longitudinal moving of the rotating abrasive disks allows the raising and the lowering of the disks against the surface to be smoothed, by an amperometric control and as a function of the current variations due to the variations of the resistance that each abrasive disk finds during the working.
  • amperometric cards which drive the current absorption in a differentiated way for each operating unit, allow to change the smoothing pressure for each one.
  • the rotating disks of the operating heads work parallel to the generatrix of the cylinder to be worked, it is possible to eliminate all the helicoidal marks produced by previous turning or grinding operations.
  • the machine according to the invention could undergo variations which can consist for instance, of different embodiments of the sliding devices and of the moving means of the frame and the operating units supported by the frame or different embodiments of the oscillation group with which each operating unit is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP97108377A 1996-05-23 1997-05-23 Procédé pour enlever la couche de chrome et les gravures d'un cylindre de gravure et machine pour l'application de ce procédé Expired - Lifetime EP0808723B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT96VI000084 IT1287292B1 (it) 1996-05-23 1996-05-23 Levigatrice-lucidatrice modulare a controllo amperometrico.
ITVI960084 1996-05-23
ITVI970036 1997-02-28
IT97VI000036 IT1292959B1 (it) 1997-02-28 1997-02-28 Metodo per asportare la cromatura e l'incisione da cilindri per rotocalco.

Publications (2)

Publication Number Publication Date
EP0808723A1 true EP0808723A1 (fr) 1997-11-26
EP0808723B1 EP0808723B1 (fr) 2000-01-19

Family

ID=26332601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97108377A Expired - Lifetime EP0808723B1 (fr) 1996-05-23 1997-05-23 Procédé pour enlever la couche de chrome et les gravures d'un cylindre de gravure et machine pour l'application de ce procédé

Country Status (3)

Country Link
EP (1) EP0808723B1 (fr)
AT (1) ATE188918T1 (fr)
DE (1) DE69701167T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927646A1 (fr) * 1998-01-05 1999-07-07 MDC Max Dätwyler Bleienbach AG Appareil et méthode de traitement d'une plaque d'impression en creux
EP0927645A1 (fr) * 1998-01-05 1999-07-07 MDC Max Dätwyler Bleienbach AG Appareil et méthode de traitement d'une plaque d'impression en creux
CN114227404A (zh) * 2022-01-05 2022-03-25 黄慧玲 一种数控机床用圆形导轨打磨制作设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE530991C (de) * 1931-08-03 Maschf Augsburg Nuernberg Ag Schleifen und Polieren von umlaufenden Tiefdruckzylindern
CH156773A (de) * 1931-10-02 1932-08-31 Albert Schnellpressen Einrichtung zum Abschleifen von Walzen, insbesondere Druckformzylindern.
CH160773A (de) * 1932-03-19 1933-03-31 Engler & Cie Verfahren und Maschine zur Bearbeitung der Oberfläche von zum Drucken dienenden Formzylindern.
BE728907A (fr) * 1969-02-25 1969-08-25

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE530991C (de) * 1931-08-03 Maschf Augsburg Nuernberg Ag Schleifen und Polieren von umlaufenden Tiefdruckzylindern
CH156773A (de) * 1931-10-02 1932-08-31 Albert Schnellpressen Einrichtung zum Abschleifen von Walzen, insbesondere Druckformzylindern.
CH160773A (de) * 1932-03-19 1933-03-31 Engler & Cie Verfahren und Maschine zur Bearbeitung der Oberfläche von zum Drucken dienenden Formzylindern.
BE728907A (fr) * 1969-02-25 1969-08-25

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927646A1 (fr) * 1998-01-05 1999-07-07 MDC Max Dätwyler Bleienbach AG Appareil et méthode de traitement d'une plaque d'impression en creux
EP0927645A1 (fr) * 1998-01-05 1999-07-07 MDC Max Dätwyler Bleienbach AG Appareil et méthode de traitement d'une plaque d'impression en creux
CN114227404A (zh) * 2022-01-05 2022-03-25 黄慧玲 一种数控机床用圆形导轨打磨制作设备
CN114227404B (zh) * 2022-01-05 2024-03-15 黄慧玲 一种数控机床用圆形导轨打磨制作设备

Also Published As

Publication number Publication date
EP0808723B1 (fr) 2000-01-19
ATE188918T1 (de) 2000-02-15
DE69701167T2 (de) 2000-09-28
DE69701167D1 (de) 2000-02-24

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