EP0690151A2 - Electrode pour le revêtement électrolytique d'éléments - Google Patents

Electrode pour le revêtement électrolytique d'éléments Download PDF

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Publication number
EP0690151A2
EP0690151A2 EP95107450A EP95107450A EP0690151A2 EP 0690151 A2 EP0690151 A2 EP 0690151A2 EP 95107450 A EP95107450 A EP 95107450A EP 95107450 A EP95107450 A EP 95107450A EP 0690151 A2 EP0690151 A2 EP 0690151A2
Authority
EP
European Patent Office
Prior art keywords
electrode according
component carrier
magnet
contact surface
components
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
EP95107450A
Other languages
German (de)
English (en)
Other versions
EP0690151A3 (fr
EP0690151B1 (fr
Inventor
Manfred Hiermeier
Paul Bünger
Willi Buchecker
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.)
BL Produktions GmbH
MTU Aero Engines AG
Original Assignee
BL Produktions GmbH
MTU Motoren und Turbinen Union Muenchen 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
Application filed by BL Produktions GmbH, MTU Motoren und Turbinen Union Muenchen GmbH filed Critical BL Produktions GmbH
Publication of EP0690151A2 publication Critical patent/EP0690151A2/fr
Publication of EP0690151A3 publication Critical patent/EP0690151A3/fr
Application granted granted Critical
Publication of EP0690151B1 publication Critical patent/EP0690151B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to an electrode for electroplating components according to the preamble of claim 1.
  • Electrodes are used to hold and make electrical contact with metal parts when they are immersed in a galvanic bath for their coating, for example for hard chrome plating.
  • the electrodes should remain equipped with the components at least during most of the process steps.
  • the interference-free electrical contacting of the components on the electrode during the coating process has a significant influence on the quality of the coating. Even a slightly incorrect positioning of the components in relation to the electrode can result in the current density, which is critical for electrolytic deposition, falling below 20 to 80 A / cm2. The contact is therefore decisive for the reject rate for coating.
  • the mechanical contacting of the components by means of contact springs which has been frequently used up to now, is not very suitable, especially for series coating with large quantities, since mechanical damage to the components is usually difficult to avoid.
  • the plug-in activity turns out to be very labor-intensive and extremely difficult to automate. Another problem is to be seen in the requirement for partial coating of the components, since coating-free surfaces of the component now have to be protected from metal deposition by means of masking tapes, lacquers, protective coatings or the like.
  • the design according to the invention has the advantage that the magnet used for securely contacting the components on the electrode-side contact surface is arranged in the cavity of a component carrier. As a result, the magnet is protected against corrosive properties of the electroplating bath or the rinsing baths, which also ensures long-term reliable adhesion of the components to the contact surface.
  • the pole axis of the magnet is aligned transversely to the contact surface and thus towards the components.
  • the polar axis is preferably aligned perpendicular to the contact surface or to the component.
  • a smooth current flow during the coating process is ensured in which the current transfer from the electrically conductive contact surface takes place directly into the wall of the component carrier, which is directly connected to the electrode-side power connection.
  • the current-carrying path between the components and the power connection is thus kept short.
  • the contact area is also dimensioned in accordance with the current density required for electrolytic deposition.
  • the component carrier of the electrode is preferably formed by a profile tube, the contact surface extending in the longitudinal direction of the profile tube.
  • the use of a profile tube ensures, on the one hand, cost-effective manufacture and, on the other hand, sufficient bending stiffness, which is the case in particular with square profile tubes.
  • the dimensional stability of the electrode is thus ensured, in particular under thermally changing conditions, during the entire coating process. Because a high dimensional stability of the component carrier is a guarantee that the current transmitted between the components and the contact surface is not impaired by the curvature of the contact surface, which in turn ensures a reliable layer quality of the components of an electrode.
  • a permanent magnet is preferred for the non-positive fixation of the components on the contact surface because, in contrast to an electromagnet, it ensures an insensitive function.
  • a high magnetic field strength for strong fixation of the components can be generated in the limited interior of the component carrier.
  • a qualitative disturbance of the coating by the magnetic effect can be excluded by the magnetic field density in the area the surface to be coated is as small as possible. This can be achieved by positioning the magnet accordingly in relation to the component.
  • the design of the electrode according to claim 7 ensures that once the positioning of the magnet has been selected, it is reproducible even after the electrode has been re-installed since the magnet is centered between the inner walls of the component carrier due to the mounting of the magnet in the U-shaped magnet carrier.
  • the magnet If the magnet is to be removed for replacement, it can be pulled out with the magnet carrier as a complete unit from the component carrier via a lockable opening and a new magnet with magnet carrier can be pushed back in.
  • the opening with the closure cap is preferably provided at an end of the component carrier located outside the plating bath, so that no rinsing liquid and no electrolyte can penetrate into the interior of the component carrier.
  • the design of the electrode with respect to the power connection leads to a simplification of the structure of the electrode and, above all, ensures a fault-insensitive current transfer between the power connection and component carrier.
  • the power connection is designed with a screw thread, operating and weight loads of the electrode can be transferred from the power connection to a holding frame, so that even when the screw connection is loosened, the full current strength can be transmitted undisturbed.
  • the design of the contact surface as a ferromagnetic metal strip encased in the component carrier on the surface has a targeted effect Influencing the magnetic field.
  • It is preferably a nickel-coated metal strip made of sheet steel, the favorable abrasion and corrosion resistance of which increases the service life of the contact surface.
  • the component carrier is made of aluminum or an aluminum alloy.
  • the magnet adheres to the inner wall of the component carrier on the contact surface side even when the electrode is not equipped, since the contact surface is ferromagnetic.
  • the electrode can be fitted in any position without additional fixation of the magnet.
  • the form-fitting and flat edging of the metal strip in the component carrier ensures a low-resistance and trouble-free current transfer between the component carrier and the contact surface.
  • the groove provided in the metal strip in the position area of the components has an aperture effect on the spread of the magnetic field lines. While the metal strip protruding on both sides of the longitudinal groove above the magnet, together with the reduced wall thickness of the component carrier in this area, has a shielding effect on the propagation of the magnetic field lines, the magnetic field penetrates the component carrier in the region of the groove almost without weakening, so that the components directly above it firmly the contact surface are fixed. At the same time, the groove enables the interior of sleeve-shaped components to be flushed, since the flushing liquid can escape there via the groove.
  • the component carrier is protected from corrosive influences of the electrolyte or the rinsing liquid by coating the component carrier with plastic, preferably with polytetrafluoroethylene, with the exception of the contact surface provided for the component assembly and the electrical contact points.
  • the coating with polytetrafluoroethylene is particularly resistant to chromium-sulfuric acid, which means that the electrode can also be used when chrome-plating components.
  • the coating has plane-machined contact surfaces, which allows a relative sliding movement between the panel and component carrier, in particular when polytetrafluoroethylene is used as coating material, so that certain thermally induced expansion differences are evenly balanced.
  • the form-fitting edging of the coating near the edge of the support surface prevents the coating from peeling off and infiltrating prematurely.
  • the component carrier can be connected to a panel according to patent claims 27 to 38. If the component carrier has several separately formed contact areas to increase the assembly capacity, it can accordingly be connected to several panels. If the components are to be coated only partially, it is advisable to use panels with component receptacles that shield the coating-free surfaces of the components from direct contact with the live electrolyte.
  • the geometry of the layer can also be influenced. For example, a layer with a conical shape can be created.
  • the panel has one or more rinsing channels, which preferably extend in the longitudinal direction of the panel. This means that the component surfaces within the panel can be wetted in sequence.
  • the screen is made of an electrically insulating material, so that coating of the component surfaces lying in the rinsing channel is avoided when immersed in the galvanic bath.
  • the current density in the rinsing channel is in any case lowered by the insulating diaphragm to such an extent that there is no coating.
  • longitudinal guiding surfaces are provided on the diaphragm, which, in cooperation with contact surfaces of the component carrier, ensure exact positioning of the diaphragm relative to the component carrier.
  • the design of the guide and support surfaces tolerate a different elongation of the panel and the component carrier. This results in a slight displacement of the components in the longitudinal direction of the flat contact surface, but without interfering with the current transfer.
  • the rectilinear component carrier 2 is formed by an aluminum profile tube with a rectangular cross section.
  • the edges 13 of the component carrier are reinforced on the inside by a sloping wall section in the cavity 14, so that there is a higher bending stiffness for the component carrier 2.
  • the cavity 14 extends essentially over the entire length of the component carrier 2 and is closed at both ends.
  • a nickel-plated steel sheet metal strip 16 is enclosed in the component carrier 2 on the surface side.
  • one of the two metal strips 16a, b has a rectangular contact surface 19 which runs in the longitudinal direction L and is plan-machined for surface contact with components 12 lined up along the contact surface 19.
  • the contact surface 19 is interrupted by a groove 20 with a rectangular cross section, which is machined into the center of the metal strip 16a.
  • FIG. 4 shows how the groove 20 reduces the thickness d1 of the metal strip 16a to the remaining thickness d2.
  • the groove 20 runs over the entire length of the metal strip 16a or its contact surface 19.
  • the contact surface width b is somewhat kept larger than the diameter of the component 12 in the region of the contact surface 19 so that somewhat larger than the components 12 shown can be accommodated.
  • the components 12, 12 ' are shown as hollow, rod-shaped turned parts, whose axis of rotation R, R' in the cross-sectional view according to FIGS. 3a and 3b with the axis of symmetry S perpendicular to the longitudinal axis L. , Si of the electrode 1 or 1 'coincides.
  • the components 12 are thus perpendicular to the contact surface 19.
  • the components 12 are fixed on the contact surface 19 by a magnet enclosed in the cavity 14 of the component carrier 2 and extending along the metal strip 16a, the pole axis or pole plane P in FIGS. 3a and 3b coincides with the axis of symmetry S and in the rotating part axis R, R ', as a result of which the magnetic field lines are centered on the components 12, 12' for better holding.
  • the magnet 3 designed as a permanent magnet according to FIG. 3a, is composed of two parallel pole bars 22 with a rectangular cross section and a yoke 23 and a U-shaped magnet carrier 24, spaced apart by an intermediate piece. Due to the magnetic force exerted by the magnet 3 on the components 12 and on the ferromagnetic metal strips 16a, the pole strips 22, which are enclosed between the flanks 25 of the magnet carrier 24, adhere flatly to the machined component-side wall of the component carrier 2. This exerts a significant influence on the expansion and strength of the magnetic field Metal strips 16a with its groove 20. The metal strip 16a thus projects above the pole strips 22 in width and length, as a result of which a certain shielding of the magnetic field is achieved.
  • the holding force for fixing the ferromagnetic components 12 arranged centrally above the groove 20 can be adjusted via the remaining thickness d2 of the metal strip 16a remaining in the region of the groove 20 and the remaining wall thickness d3 between the magnetic strip 16a and the magnet 3. Due to the arrangement of the ferromagnetic metal strip 16a between magnets 3 and components 12, these can be fixed to the electrode 1 without the coating being disturbed by the magnetic field lines.
  • the component carrier 2 is covered all around with a protective layer 26, with the exception of the contact area 19 and other electrical contact points.
  • the protective layer 26 is machined on both sides of the longitudinal edges 13 on the contact surface.
  • the contact surfaces 11 thus formed serve the guide surfaces 10 for the central positioning of the diaphragm 4 relative to the component carrier 2.
  • the opening 7 formed at the end of the component carrier 2 serves to insert and remove the magnet 3.
  • FIG. 5 shows the opening 7 in the unlocked state, an external thread 27 attached around the opening 7 serving to close the opening 7 by means of the flap 6, as is shown in FIG. 2.
  • the electrode 1 can be connected to a power source via the flap 6 and / or via the soldering tab 36 connected to the metal strip 16a.
  • the aperture 4 has 12 pairs of drill holes as component receptacles 28 for receiving a rotationally symmetrical component.
  • the boreholes of a pair designed according to the component contour are aligned coaxially with one another and are perpendicular to the longitudinal axis L with their borehole axis B or coincide with the axis of symmetry S in FIG. 3a.
  • the component receptacles 28 arranged in a row are spaced apart from one another in sections in the longitudinal direction L, so that interference effects when coating the components 12 can be excluded.
  • a flushing channel 29a is provided, which is designed as a bore extending within the diaphragm 4.
  • the components penetrate through the diametrically opposite arrangement of the drill holes of the pairs 12 the rinsing channel 29a, which ensures that the surfaces of the components 12 to be kept free of the coating can be rinsed.
  • the sinkings and radii 30 provided on the boreholes favor the introduction and removal of the components 12. Since only the end face is to be coated in the component 12 shown in FIG. 3a, the component 12 has a shelter relative to the component receptacle 28. The lateral surface of component 12 thus remains uncoated. In contrast, the component 12 'according to FIG.
  • the cover 4 forms a second flushing channel 29b with the component carrier. This is formed on the dazzle side by a recess 31 which extends in the longitudinal direction L and, together with the longitudinal surface 15 of the component carrier 2 on the contact surface, spatially closes off the second rinsing channel 29b.
  • This second rinsing channel 29b and the groove 20 also ensure that hollow components 12 can be rinsed.
  • Both rinsing channels 29a and 29b are open at the end of the diaphragm 4, so that the rinsing channels 29a, b fill automatically when the electrode 1 is immersed in a liquid bath.
  • the clamping means 5 used for the releasable connection of the panel 4 and component carrier 2, as in FIGS. 3b, consist of a clamping bracket 32 and clips 33. Enclosing the component carrier 2, the clamping bracket 32 engages in a form-fitting manner in recesses 34 in the panel 4 and is clamped with clamps 33 relative to the component carrier 2. This clamp connection ensures a firm fit of the panel 4 on the component carrier 2 without inhibiting thermally induced expansion movements in the longitudinal direction L between the panel 4 and component carrier 2.
  • the electrode 1 can be attached to one Plating frame not shown are attached.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Thermistors And Varistors (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
EP95107450A 1994-06-08 1995-05-17 Electrode pour le revêtement électrolytique d'éléments Expired - Lifetime EP0690151B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419982 1994-06-08
DE4419982A DE4419982C1 (de) 1994-06-08 1994-06-08 Halte- und Kontaktiervorrichtung zum galvanischen Beschichten von Bauteilen

Publications (3)

Publication Number Publication Date
EP0690151A2 true EP0690151A2 (fr) 1996-01-03
EP0690151A3 EP0690151A3 (fr) 1998-11-11
EP0690151B1 EP0690151B1 (fr) 2001-02-28

Family

ID=6520066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107450A Expired - Lifetime EP0690151B1 (fr) 1994-06-08 1995-05-17 Electrode pour le revêtement électrolytique d'éléments

Country Status (5)

Country Link
US (1) US5618396A (fr)
EP (1) EP0690151B1 (fr)
JP (1) JPH0841691A (fr)
AT (1) ATE199414T1 (fr)
DE (2) DE4419982C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004085714A1 (fr) * 2003-03-24 2004-10-07 Wieland Dental + Technik Gmbh & Co. Kg Dispositif et partie de ce dispositif pour la formation par depot galvanique de pieces faconnees dentaires

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2134724B1 (es) * 1997-05-30 2000-05-01 Espan Carburos Metal Equipo y procedimiento para llevar a cabo la extraccion electrolitica de metales en disolucion en una celda electrolitica.
DE19901624A1 (de) * 1999-01-18 2000-09-14 Helmut Fischer Gmbh & Co Bauteilträger
GB0002677D0 (en) * 1999-02-12 2000-03-29 Helmut Fischer Gmbh & Co Handling module for at least one component for mounting on and removal from a component carrier
US6134998A (en) * 1999-04-05 2000-10-24 Loeffler; Fredrick L. Part positioner and holder for lathes
GB2564896B (en) * 2017-07-27 2021-12-01 Semsysco Gmbh Substrate locking system for chemical and/or electrolytic surface treatment
CN113718320B (zh) * 2021-11-04 2022-03-29 山东盛世恒机械制造有限公司 一种便于控制的金属镀覆固定装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE520334C (de) * 1929-12-01 1931-03-10 Langbein Pfanhauser Werke Akt Aufhaengung von zu galvanisierenden, sperrigen, nadelartigen Waren aus magnetisierbarem Stoff
US2911347A (en) * 1957-04-01 1959-11-03 Intercompany Corp Plating rack
DE2537362C2 (de) * 1975-08-19 1986-12-04 Schering AG, 1000 Berlin und 4709 Bergkamen Vorrichtung zur Aufnahme von Kleinteilen zum Zwecke der galvanischen Oberflächenbehandlung
JPS56169791A (en) * 1980-05-29 1981-12-26 Mazda Motor Corp Plating method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004085714A1 (fr) * 2003-03-24 2004-10-07 Wieland Dental + Technik Gmbh & Co. Kg Dispositif et partie de ce dispositif pour la formation par depot galvanique de pieces faconnees dentaires

Also Published As

Publication number Publication date
EP0690151A3 (fr) 1998-11-11
EP0690151B1 (fr) 2001-02-28
US5618396A (en) 1997-04-08
JPH0841691A (ja) 1996-02-13
DE4419982C1 (de) 1995-10-26
DE59509045D1 (de) 2001-04-05
ATE199414T1 (de) 2001-03-15

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