EP3822393A1 - Dispositif de retenue de pièces lors d'un traitement électrolytique - Google Patents

Dispositif de retenue de pièces lors d'un traitement électrolytique Download PDF

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Publication number
EP3822393A1
EP3822393A1 EP20000411.7A EP20000411A EP3822393A1 EP 3822393 A1 EP3822393 A1 EP 3822393A1 EP 20000411 A EP20000411 A EP 20000411A EP 3822393 A1 EP3822393 A1 EP 3822393A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
support arms
frame
contact
titanium
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Withdrawn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
EP20000411.7A
Other languages
German (de)
English (en)
Inventor
Mirko Fortak
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.)
Wtf Galvanotechnik & Co Kg GmbH
Original Assignee
Wtf Galvanotechnik & Co Kg GmbH
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 DE202019004756.5U external-priority patent/DE202019004756U1/de
Priority claimed from DE102019008115.3A external-priority patent/DE102019008115B4/de
Application filed by Wtf Galvanotechnik & Co Kg GmbH filed Critical Wtf Galvanotechnik & Co Kg GmbH
Publication of EP3822393A1 publication Critical patent/EP3822393A1/fr
Withdrawn legal-status Critical Current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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • 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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • C25D17/08—Supporting racks, i.e. not for suspending
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/14—Producing integrally coloured layers

Definitions

  • the invention relates to a device primarily for electrolytic coloring or for electrolytic lacquer coating of, in particular, metallic workpieces in a container, the workpieces being suspended from a support frame and immersed in a corresponding bath.
  • the disadvantage here is the poorer electrical conductivity (15 times less than aluminum), so that so far titanium anodes have only been used for smaller aluminum parts.
  • Another disadvantage is that it becomes uncontrolled Build contact bridges that lead to burn-in in the aluminum item to be treated.
  • the contact current is subject to fluctuations with the result that the layer thickness of the layer produced by the anodizing cannot be precisely defined.
  • a contact pliers for electrophoretic painting of metal parts is proposed. Screw clamps, toggle clamps or screw compression spring loaded joint leg clamps are already known. However, their moving parts quickly become clogged with paint and are also complicated to set up. Therefore, contact pliers with two pliers legs are proposed, which are elastically connected by a U-shaped leaf spring. A conductor strip is attached to one of the pliers legs between the inside and the leaf spring. This can be connected to a connection cable at the other end. These contact pliers only have a small clamping range and a low contact pressure and are therefore only suitable for small workpieces.
  • the applicant has proposed a device and a method for the electrochemical treatment of thin material to be treated, which no longer requires continuous cleaning of the support frame and clamps, and enables a better current transfer from the clamps to the workpiece.
  • the jaws of the clamps are made of titanium and the surfaces are designed with elevations.
  • intermediate pieces made of aluminum are arranged between the workpiece and the clamping jaws, which form a wear part and improve the current transfer.
  • a device for producing an electrical connection between a goods carrier unit and the container edge of an electroplating system is proposed.
  • a goods carrier unit for placing on the container edge has wedge-shaped rails which engage in V-shaped contact bodies on the container.
  • blade contacts between contact lugs are described.
  • these variants do not allow a sufficient flow of current with larger workpieces.
  • This solution for generating sufficient contact pressure is relatively expensive and requires ongoing maintenance.
  • This variant is not very suitable for an electrical connection between a large number of workpieces and a goods carrier, since here the contact area is lowered into the immersion bath. This part of the device would also be exposed to the galvanic process and would have to be cleaned after each bath.
  • the object of the invention is to propose a support frame with support arms for the workpieces in a device for the electrolytic treatment of in particular metallic workpieces in a container with a coloring bath or a bath for paint coating, by means of which a secure, quickly fixable and detachable connection to the workpieces is possible becomes and at the same time a defined and secure Power transmission from the support arms to the workpieces is guaranteed.
  • the invention provides that the support arms are made of titanium and have a contact plate made of titanium or stainless steel at the end remote from the respective frame strut, to which a molded piece made of aluminum for contacting and fixing a Edge of the workpiece is flanged.
  • This design makes use of the significantly increased resilience of titanium compared to conventional aluminum frames. Furthermore, the time until stripping is reduced. In total, stand lines of 1 - 2 years can be achieved, which represents a significant increase in productivity.
  • the contact plate preferably has surface elevations which act against the molded piece made of aluminum.
  • the current is transmitted in a punctiform manner with contact pressures that overcome oxidation phenomena.
  • the releasable flanging of the fittings made of aluminum means that the fittings can be easily exchanged if they are worn out.
  • a first advantageous embodiment of this device provides that the frame struts, the support arms with the contact plates and the molded pieces have a PVC coating, the contact points with the workpiece being excluded from this.
  • This known coating reduces the roughness of the titanium surface, which makes cleaning much easier and reduces paint adhesion.
  • the frame struts, the support arms with the contact plates and the molded pieces have a PFA (perfluoroalkoxy polymer) coating and at least the contact points with the workpiece are excluded.
  • the PFA coating has the advantage over a PVC coating that it has a higher temperature resistance of 240 ° C (PVC ⁇ 150 ° C). This enables process steps such as baking, which takes place at approx. 230 ° C, without having to change the workpiece carrier.
  • the fittings have a notch, preferably designed as a V-shaped or prismatic recess, for receiving an edge of the workpiece and thus also for establishing a current transmission contact from the fitting to the workpiece. This makes it easier to arrange the workpieces intended for coloring or lacquer coating, since no precise fitting is required.
  • Edge of the workpiece in the sense used here can be an outer edge of the workpiece or also a profile edge or recess on the workpiece.
  • the width of the fittings can also be used to influence the flow of current in a targeted manner. Furthermore, the linear contact that can be achieved by this arrangement is advantageous in terms of optimized current transmission. The contact can also be made by point contacts if the contacts of the current to be transmitted are sufficient in cross section.
  • a further advantageous embodiment provides that the support arms, which receive a workpiece, have a different spring elasticity in that their length is configured differently. Different lengths of the support arms with the smallest possible extension of the support arms are preferably achieved by using curved and / or angled support arms in addition to straight support arms or those which have a spiral-shaped section.
  • the contact pressure between the shaped pieces and the workpiece is preferably set to a value between 3 and 8 kg / mm 2 , preferably around 5 kg / mm 2 . In this way, there is sufficient pressure to break up the formation of oxidation layers and thus to ensure a stable, definable current flow.
  • support arms are arranged opposite one another on the frame struts, i.e. the frame struts are equipped with workpieces on both sides.
  • frame struts are positioned at a distance from one another and next to one another.
  • Fig. 1 shows a device according to the invention for holding workpieces 8 during the electrolytic treatment in at least one container with a coloring bath or a bath for lacquer coating.
  • a frame strut 1 that can be raised and lowered.
  • connection 2 in the form of a socket, between which a workpiece 8 can be clamped, here, for example, a car roof rail.
  • the support arms 3, 4 are made of titanium, which ensures a longer-lasting spring stability compared to aluminum.
  • the support arms 3, 4 have a contact plate 6 made of titanium or stainless steel, to which a molded piece 5 made of aluminum for contacting and fixing an edge of the workpiece 8 is flanged.
  • the notches are preferably V-shaped or trapezoidal recesses 7.
  • the current flow to the workpiece 8 takes place via the frame strut 1, the support arms 3, 4, the contact plate 6 and the respective shaped piece 5. So that this takes place reliably and without great cleaning effort with high productivity of the system, further configurations are made.
  • the frame struts 1, the support arms 3, 4 with the contact plates 6 and the shaped pieces 5 are provided with a PFA coating (perfluoroalkoxy polymer) in order to smooth the roughness of the titanium surface.
  • PFA coating perfluoroalkoxy polymer
  • the contact plate 6 made of titanium or stainless steel has elevations on the contact side with the molded piece 5, which provide for a point or line transmission of current.
  • the support arms 3, 4 have a different resilience in that their length is configured differently.
  • Different lengths of the support arms 3, 4 are achieved in that they are designed as straight (support arms 4) and as curved and angled (support arms 3). Furthermore, the arrangement of the fastening of the straight support arms 4 on the frame strut 1 on the workpiece side and of curved and angled support arms 3 on the one through the support arm 3 takes place workpiece to be picked up 8 opposite side of the frame strut 1.
  • the contact pressure between the shaped pieces 5 and the workpiece 8 is between 3 and 8 kg / mm 2 , preferably 5 kg / mm 2 . This contact pressure is sufficient to break up any oxidation phenomena at the contact points and thus ensure a stable flow of current.
  • Fig. 2 shows a curved workpiece 8 that is clamped by three support arms 3, 3, 4, a straight support arm 4 and two support arms 3, the length of which is increased by a spiral and which are therefore softer in their resilience.
  • a receptacle 2 with three socket-like connections is used here to fix the support arms 3, 3, 4 on the frame strut.
  • Fig. 3 shows in detail an arcuate and angled support arm 3, which is connected to the frame strut 1 on the opposite side of the workpiece 8 to be received by the support arm 3.
  • the support arm 3 has a contact plate 6 made of titanium or stainless steel, to which a molded part 5 made of aluminum is flanged as a wear part for contacting and fixing an edge of a workpiece 8.
  • the edge of the workpiece 8 is introduced into a V-shaped or trapezoidal recess 7.
  • the contact plate 6 has elevations on the side facing the molded part 5, so that the current is transmitted via contact points or contact lines.
  • the molded part 5 Due to the releasable connection between the contact plate 6 and the molded part 5, the molded part 5 can easily be replaced when worn.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)
EP20000411.7A 2019-11-14 2020-11-11 Dispositif de retenue de pièces lors d'un traitement électrolytique Withdrawn EP3822393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019004756.5U DE202019004756U1 (de) 2019-11-14 2019-11-14 Vorrichtung zum Halten von Werkstücken bei der elektrolytischen Behandlung
DE102019008115.3A DE102019008115B4 (de) 2019-11-14 2019-11-14 Vorrichtung zum Halten von Werkstücken bei der elektrolytischen Behandlung

Publications (1)

Publication Number Publication Date
EP3822393A1 true EP3822393A1 (fr) 2021-05-19

Family

ID=73451984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000411.7A Withdrawn EP3822393A1 (fr) 2019-11-14 2020-11-11 Dispositif de retenue de pièces lors d'un traitement électrolytique

Country Status (2)

Country Link
EP (1) EP3822393A1 (fr)
CN (1) CN112795972A (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241887B (de) 1964-06-01 1967-06-08 Leipzig Galvanotechnik Vorrichtung zur Herstellung einer elektrischen Verbindung bei einer Galvanisieranlage
DE8502551U1 (de) 1985-01-31 1985-05-09 Kever, Helmut, 8900 Augsburg Kontaktzange, insbesondere fuer die elektrophoretische lackierung von metallteilen
DE9411523U1 (de) 1993-09-08 1994-09-22 Stohrer-Doduco GmbH & Co, 71277 Rutesheim Vorrichtung zum anodischen Oxidieren von Werkstücken
DE10145554C1 (de) 2001-09-14 2002-11-28 Atotech Deutschland Gmbh Vorrichtung zur naßchemischen und elektrolytischen Behandlung von sehr dünnem und flachem Behandlungsgut
EP1889951B1 (fr) 2006-08-18 2010-11-03 Wolf-Thilo Fortak Industrieberatung und techn. Sevice für die Galvanotechnik Appareil et procédé pour l'anodisation de pièces à usiner
US20120168998A1 (en) * 2010-12-29 2012-07-05 Hon Hai Precision Industry Co., Ltd. Rack apparatus
DE202015102339U1 (de) * 2015-05-07 2015-05-15 Süddeutsche Aluminium Manufaktur GmbH Gestell zur Handhabung von elektrochemisch zu behandelnden Gütern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241887B (de) 1964-06-01 1967-06-08 Leipzig Galvanotechnik Vorrichtung zur Herstellung einer elektrischen Verbindung bei einer Galvanisieranlage
DE8502551U1 (de) 1985-01-31 1985-05-09 Kever, Helmut, 8900 Augsburg Kontaktzange, insbesondere fuer die elektrophoretische lackierung von metallteilen
DE9411523U1 (de) 1993-09-08 1994-09-22 Stohrer-Doduco GmbH & Co, 71277 Rutesheim Vorrichtung zum anodischen Oxidieren von Werkstücken
DE10145554C1 (de) 2001-09-14 2002-11-28 Atotech Deutschland Gmbh Vorrichtung zur naßchemischen und elektrolytischen Behandlung von sehr dünnem und flachem Behandlungsgut
EP1889951B1 (fr) 2006-08-18 2010-11-03 Wolf-Thilo Fortak Industrieberatung und techn. Sevice für die Galvanotechnik Appareil et procédé pour l'anodisation de pièces à usiner
US20120168998A1 (en) * 2010-12-29 2012-07-05 Hon Hai Precision Industry Co., Ltd. Rack apparatus
DE202015102339U1 (de) * 2015-05-07 2015-05-15 Süddeutsche Aluminium Manufaktur GmbH Gestell zur Handhabung von elektrochemisch zu behandelnden Gütern

Also Published As

Publication number Publication date
CN112795972A (zh) 2021-05-14

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