EP1464732A1 - Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile - Google Patents

Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile Download PDF

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Publication number
EP1464732A1
EP1464732A1 EP03425200A EP03425200A EP1464732A1 EP 1464732 A1 EP1464732 A1 EP 1464732A1 EP 03425200 A EP03425200 A EP 03425200A EP 03425200 A EP03425200 A EP 03425200A EP 1464732 A1 EP1464732 A1 EP 1464732A1
Authority
EP
European Patent Office
Prior art keywords
installation according
parts
treated
treatment
circuit
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.)
Withdrawn
Application number
EP03425200A
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English (en)
French (fr)
Inventor
Valerio Grechi
Tommaso Della Valle
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.)
Tecnol SpA
Original Assignee
Tecnol SpA
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 Tecnol SpA filed Critical Tecnol SpA
Priority to EP03425200A priority Critical patent/EP1464732A1/de
Publication of EP1464732A1 publication Critical patent/EP1464732A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/005—Contacting devices
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/04—Removal of gases or vapours ; Gas or pressure control
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/003—Electroplating using gases, e.g. pressure influence
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating

Definitions

  • the present invention relates to an installation for the application of a coating by galvanic reaction to metal parts or components undergoing treatment.
  • such application is performed by galvanic reaction of the chemical treatment solutions between a cathode, consisting of the actual part to be treated, and an anode.
  • the chemical solutions come into contact with the surface to be treated by methods that can essentially be broken down into two categories: contact by total immersion of the part undergoing treatment in baths of treatment solution, and contact by circulating the liquid solution around a liquid circuit that includes the actual part to be treated. More particularly, in the first method the part is immersed in the chemical solutions and/or in the baths of the various stages that make up the codeposition treatment, the treatment substances thus being applied to the whole of the part, both on the surfaces that are to be treated and on those that are not.
  • the second method involves circulating the solution around a liquid circuit that includes the part.
  • the surface to be treated which is on the inside of the fluid circuit, is in contact with the circulating solution.
  • a galvanic reaction takes place between an anode and the part which acts as the cathode in order to promote the coating codeposition.
  • a pump is used to maintain the pressure necessary to circulate the chemical solutions used for the various stages of the treatment.
  • the part to be treated is fixed by means of flanges to the circuit and the solutions travel through the circuit and through the part to be treated. This avoids wetting the portion of the part that has no need to be treated, i.e. the outer surface.
  • the installation may comprise one or more stations for clamping one or more parts to be treated.
  • An outward-flow pipe and a return-flow pipe for the treatment fluid may be connected to each of said stations.
  • each of the various treatment stations comprises a seal on which the part to be treated is stood and clamped.
  • the seal surrounds the fluid return-flow pipe and the outlet of the fluid outward-flow pipe.
  • the invention relates to a method for the galvanic treatment of parts having an internal cavity (especially but not exclusively cylinders of internal-combustion engines), in which a part to be treated is inserted into a circuit carrying a treatment fluid and the fluid is circulated through said part, an electric potential being applied between two electrodes, one of said electrodes being said part.
  • the treatment is carried out by maintaining the pressure of the fluid in the cavity of the part to be treated at a lower value than the pressure of the external environment.
  • Fig. 2 shows a general block diagram of the installation.
  • Reference 1 denotes the section of the installation containing the treatment stations, where the parts to be treated are fixed and where the actual treatment takes place.
  • Fig. 1 shows a portion of this treatment section, the complete layout of which is visible in Fig. 3.
  • the section 1 has a polygonal configuration, with a distribution of six work zones symmetrically arranged around a vertical axis. Each work zone has a distribution of five treatment stations in a star arrangement.
  • the distribution of the treatment stations may differ from that illustrated, and indeed that the installation could have only a single workstation.
  • Fig. 1 shows, in a longitudinal section, one of the six work zones with one of the corresponding treatment stations.
  • the other treatment stations and the other work zones are essentially the same.
  • Fig. 1 shows that the treatment zone 1 comprises a first section of outward-flow line 3 carrying the treatment liquids to a first chamber 5.
  • the chamber 5 and the line 3 are common to the various work zones and treatment stations.
  • From the chamber 5 a second section of outward-flow line 7 branches off to each work zone.
  • This line leads to a second chamber 9 from where a third section of outward-flow line 11 branches off to each of the five treatment stations 13.
  • a part 15 undergoing treatment and positioned on the work station 13 illustrated in Fig. 1 is pressed down on a seal or gasket 17. From here a first section of return-flow line 19 leads off from each treatment station 13.
  • each treatment station 13 extends vertically above the surface defined by the seal 17, thus extending into the cavity of the respective part 15 undergoing treatment.
  • the corresponding section of outward-flow pipe 11 ends at the flat surface of the seal 17 and the outlet end of this pipe 11 surrounds the pipe 19.
  • the sections of return-flow line 19 of the five stations 13 belonging to a single work zone lead to a third chamber 21. From here, for each of the six work zones of the installation, a second section of return-flow line 23 branches off, the various sections of line 23 being brought together in a manifold 24 leading to a final section of return-flow line 25.
  • Each work zone has a clamping device 27 with a star configuration. This is used to simultaneously clamp the five parts 15 undergoing treatment in each work zone.
  • the clamping device 27 is clamped by a toggle mechanism 28, although mechanisms of e.g. hydraulic type are also possible.
  • the device 27 presses the parts 15 down on the upper surface of the respective seal 17 to prevent leaks.
  • a fluid path is thus defined, formed by the pipes and chambers 3, 5, 7, 9, 11, 19, 23, 24, 25 and by the internal cavity of the part 15.
  • the parts are cylinders of internal-combustion engines, the ports of which are closed at the appropriate time in a manner not shown in the drawing.
  • the section of pipe 19 forms the anode for the galvanic treatment, and is connected to a voltage source (not shown in Fig. 1).
  • the cathode is formed by the part 15 itself, which is electrically connected to the other terminal of the voltage source through the clamping mechanism 27.
  • the installation according to the invention also includes (Fig. 2) a pumping system comprising at least one circulation pump 31 and a control device 33 for controlling said circulation pump. These are located downstream of the various treatment stations 13 with respect to the direction of flow. There are also tanks 35, 47, 39, 41, their number and capacity being adequate to contain all the substances used in carrying out the process of application of the coating. Depending on the nature of the substances used during the treatment, there may be systems 43, 45 for cooling the solutions and known per se, systems 47 for injecting controlled amounts of the solutions into the installation, tanks 49 containing demineralized water or other substances - and associated feeder systems 51 - effective in removing from the lines of the installation any residues of substances not wanted in certain stages of the treatment.
  • Each tank 35, 37, 39, 41, 49 is equipped with valves to control access to and release from each of said tanks 35, 37, 39, 41, 49.
  • solenoid valves 235, 237, 239, 241, 249 and 335, 337, 339, 341, 349 are used.
  • an electricity generator 55 for driving the galvanic reaction of application and for driving all the systems involved in the treatment.
  • the sections of pipe 19 that form the anodes and the various clamping systems 27 which are in electrical contact with the parts 15 that form the cathodes are electrically connected to this generator.
  • a discharge 57 with a valve 59 for the exit of the liquids from the installation can be reached by lines from the treatment station 13 or directly from some of the tanks 37, 39 containing the solutions utilized. Also provided is an additional valve 61 for the controlled admission of air to the installation.
  • each treatment station 13 places on each treatment station 13 the part to be treated 15 in such a way that the part 15 presents a surface of adhesion to the gasket 17.
  • the part must be prepared in such a way that once on its station it forms a part of the treatment liquid circuit. For this purpose it must be sealed. Any holes or ports must first be closed up. Nonetheless, because the liquid circuit into which the part is integrated is at a lower pressure than atmospheric pressure, the seal does not need to be perfect since there is never any risk of liquid escaping from the part 15. Besides, from a practical point of view, the fact that the part to be sealed up is at low pressure facilitates the making of the seal because the external atmospheric pressure contributes to the clamping of the flanges, which after all must ensure the seal at a theoretical maximum pressure of 1 bar. For these reasons the clamping of the part to be treated to the installation may be achieved by vacuum only and the clamping system 27 may be there purely in order to supply the electrical voltage to the part.
  • the mechanical clamping device 27 fixes the position of the part 15 in the station 13.
  • the automatic system 53 for controlling and monitoring the treatment stages activates the circulation pump 31 via the control device 33 to produce inside the fluid circuit, which includes the various parts 15 clamped in their positions, a vacuum which may if wished also contribute to the leaktight adhesion of the part 15 to the gasket 17. Said vacuum draws the liquid from one or other of the various tanks (depending on the treatment program) and is sufficient to fill the lines of the circuit and circulate the solutions or liquids necessary to carry out the various stages of the treatment.
  • the installation according to the invention may be equipped with a vacuum switch that enables starting up of the process only below a defined pressure. In this way there is immediate and automatic verification that the system is sufficiently sealed.
  • the process of applying the coating involves wetting the surface to be treated with all the liquid solutions present in the tanks 35, 37, 39, 41, 49, in an order controlled by the automatic system 53.
  • the process involves opening the valve corresponding to the tank containing the required solution at one or more stages of the treatment and sucking this solution into the lines of the circuit by vacuum.
  • the flow wets the surface undergoing the treatment, and the mechanical clamping component 27 - also acting as an electrical contact - supplies energy to the part 15 so that a galvanic reaction is produced between the part 15 and the first section of return-flow line 19, causing the coating to be deposited.
EP03425200A 2003-03-31 2003-03-31 Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile Withdrawn EP1464732A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03425200A EP1464732A1 (de) 2003-03-31 2003-03-31 Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425200A EP1464732A1 (de) 2003-03-31 2003-03-31 Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile

Publications (1)

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EP1464732A1 true EP1464732A1 (de) 2004-10-06

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EP03425200A Withdrawn EP1464732A1 (de) 2003-03-31 2003-03-31 Eine Vorrichtung und Verfahren zum Auftragen einer Beschichtung auf metallische Teile

Country Status (1)

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EP (1) EP1464732A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641872A1 (de) * 1993-09-02 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Plattiermethode, Plattierflüssigkeit und plattiertes Maschinenbauteil
EP0641874A1 (de) * 1993-09-02 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Vorrichtung zur Behandlung von Oberflächen
US5538615A (en) * 1993-11-16 1996-07-23 Ontario Hydro Metal tube having a section with an internal electroformed structural layer
DE10140934A1 (de) * 2001-08-10 2003-02-20 Gramm Gmbh & Co Kg Vorrichtung und Verfahren zur galvanischen Oberflächenbehandlung von Werkstücken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641872A1 (de) * 1993-09-02 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Plattiermethode, Plattierflüssigkeit und plattiertes Maschinenbauteil
EP0641874A1 (de) * 1993-09-02 1995-03-08 Yamaha Hatsudoki Kabushiki Kaisha Vorrichtung zur Behandlung von Oberflächen
US5538615A (en) * 1993-11-16 1996-07-23 Ontario Hydro Metal tube having a section with an internal electroformed structural layer
DE10140934A1 (de) * 2001-08-10 2003-02-20 Gramm Gmbh & Co Kg Vorrichtung und Verfahren zur galvanischen Oberflächenbehandlung von Werkstücken

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