EP0094812B1 - Einspannvorrichtungen zum Tragen langgestreckter horizontaler Werkstücke beim Anodisieren und ähnlicher Verfahren - Google Patents

Einspannvorrichtungen zum Tragen langgestreckter horizontaler Werkstücke beim Anodisieren und ähnlicher Verfahren Download PDF

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Publication number
EP0094812B1
EP0094812B1 EP19830302729 EP83302729A EP0094812B1 EP 0094812 B1 EP0094812 B1 EP 0094812B1 EP 19830302729 EP19830302729 EP 19830302729 EP 83302729 A EP83302729 A EP 83302729A EP 0094812 B1 EP0094812 B1 EP 0094812B1
Authority
EP
European Patent Office
Prior art keywords
contact
support member
recess
vertical
jig according
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
Application number
EP19830302729
Other languages
English (en)
French (fr)
Other versions
EP0094812A1 (de
Inventor
Dominique Caillat
Jean Bazerque
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.)
Rio Tinto Alcan International Ltd
Original Assignee
Alcan International Ltd Canada
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 Alcan International Ltd Canada filed Critical Alcan International Ltd Canada
Publication of EP0094812A1 publication Critical patent/EP0094812A1/de
Application granted granted Critical
Publication of EP0094812B1 publication Critical patent/EP0094812B1/de
Expired 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 present invention relates to jigs for the support of elongated workpieces, such as lengths of extruded aluminium, in electrolytic treatment processes, such as anodising and electrolytic colouring which result in the application of a coating of reduced electrical conductivity on the workpieces.
  • a horizontal support beam (commonly known as a flight bar) and a pair of spaced vertical current-carrying members (commonly referred to as splines), which are suspended from the flight bar.
  • the flight bar is connected to one terminal of the electrical supply, which may be A.C. or D.C., according to the requirements of the process.
  • the flight-bar constitutes a support beam which is not immersed in the electrolyte in operation.
  • a transverse support member is attached to the lower end of each spline. The whole load of work is supported by the two transverse support members (but possibly assisted by intermediate electrically inactive supports, suspended from the flight bar).
  • the whole of the anodic current is carried from the work to the splines through these two transverse members.
  • the work is loaded onto the jig outside the treatment tank and is-then lifted into the cell by, for example, an overhead travelling crane.
  • first layer of aluminium workpieces is placed on the transverse support members.
  • metallic spacer bars are placed immediately above the transverse support members and the procedure is repeated until a complete load of work has been stacked up. The load of work is then clamped together to ensure a good electrical contact through the workpieces of the load to the transverse support members.
  • an anodic oxide coating of reduced conductivity develops on the workpieces and it is necessary in such an arrangement that the metallic spacer bars also develop an electrically resistive coating during the process. Without the growth of such a coating an increasingly large proportion of the cell current would flow to the spacer bars. In consequence in anodising aluminium such spacer bars are normally formed of aluminium. Where the spacer bars and transverse support members are formed from aluminium it is necessary, in the case of a conventionally constructed jig, to strip off the anodically formed oxide coating after each treatment cycle to ensure good electrical contact between such members and the workpieces of the next load. Such stripping is effected by a chemical treatment (usually in sodium hydroxide solution) or by a mechanical treatment, such as grinding.
  • the spacer bars are relatively short, uncomplicated extruded sections, rarely exceeding 60 cm. in length, and thus they are easy to handle and only require a stripping tank of modest dimensions to strip a large number of spacer bar sections in a single stripping operation.
  • the assembly of flight bar, splines and transverse support members require a large stripping tank, if the stripping is to be effected without disassembly. Even where the splines are removed from the flight bar for stripping, a relatively long stripping tank is required and the removal and reconnection of the splines to the flight bar after completion of the stripping operation is time wasting.
  • the depth of a tank for electrolytic treatment of horizontally arranged workpieces does not exceed 2 metres.
  • the cell liquor can rise through only a small proportion of the depth of the recess under hydrostatic pressure as the jig is lowered vertically into the tank.
  • the contact area between the contact pin and the transverse spacer member may remain dry and unattacked by the cell liquor.
  • the pin is preferably somewhat rectangular in shape and preferably presents two mutually inclined contact surfaces at its upper end for contact with corresponding faces at the upper end of the recess.
  • the major dimension of the pin is arranged to be transversely in relation to the flight bar.
  • each support member may be provided with two or even more contact pins.
  • Such contact pins may be disposed on opposite sides of the spline or, in some cases, on the same side of the spline.
  • the pins may be cylindrical in shape and have frustro-conical upper ends for engagement in recesses of similar shape.
  • contact pin is provided with a single frusto-conical contact surface
  • diametrically opposite portions of such surface may be regarded as separate surfaces of equal and opposite inclination in relation to each other.
  • transverse support members may be provided at more than one level on the spline. Where there are multiple transverse support members, separate clamps (not forming an integral part of the spline) are preferably provided for clamping the work to the transverse support member which carries it.
  • the contact pins may have a single horizontal flat contact surface on the upper end thereof for engagement with a single horizontal surface in the recess in the spacer member.
  • the only contact surface on the jig assembly (other than on the spacers; are at the upper end on the contact pins on the transverse support members. Since the contact surfaces on the contact pins are protected from the action of electrolyte, it is unnecessary to strip them. In consequence it is unnecessary to strip the jig assembly.
  • the splines and transverse support members, except for the contact surfaces, may be coated with or encased in liquid-resistant plastics material to avoid such attacks as are otherwise inevitable in alkaline etching or other chemical pretreatment stages.
  • the transverse spacer members which receive the pins on the support members, are preferably of distinctive appearance as compared with the remaining spacers. It is preferable to strip these special spacer members mechanically by grinding off the anodic oxide film which forms on the top edge. Chemical stripping of such spacers could lead to some erosion of the contact face or faces in the recess and thus result in a progressively less satisfactory electrical contact between the pin and its associated transverse spacer member.
  • the vertical spline bar 1 has a transverse support member 2 secured to it by welding or in any other way appropriate to produce a secure electrical contact between them.
  • the support member 2 carries a rectangular contact pin 3 at each end and such pin has inclined contact surfaces 4 ( Figure 3) at its top end.
  • the support member 2 co-operates with a transverse spacer 5 which has a corresponding recess 6 to receive the contact pins 3 and has contact surfaces 7 to coact with contact surfaces 4.
  • the recesses 6 are demensioned in such a way that a definite air gap exists between the sides of the pin 3 and the sides of the slot 6, within which liquid can rise to some extent under hydrostatic force, and through general expansion/contraction of the entrapped air due to thermal effects in the processing but cannot reach the contact surfaces 4 and 7.
  • the existence of the gap between the sides of the pin below the contact surfaces 4 and the sides of the recess allows easy removal and replacement of the spacers 5.
  • a layer of workpieces W are arranged on the support member 2 and a transverse spacer bar 8 is arranged on such workpieces. Further layers of workpieces W, separated by spacer bars 8, complete the stack carried by the jig.
  • the spline 1 is preferably connected to its associated flight bar F by a removable pin P.
  • the spline preferably carries a stirrup 10 near its top end to support a jack screw 11 and clamp member 12 for clamping the assembly of workpieces down onto the support member 2 to ensure good electrical contact between the support member and all the workpieces and transverse spacers.
  • the spacer members 8 are preferably X-shaped, as shown, or of similar shape so that they are to some extent resiliently compressible under vertical pressure. It will be understood that these spacers are stripped by chemical or mechanical means (as appropriate) after each electrolytic treatment operation.
  • clamping of the workpieces may be effected by means of stepped wedges inserted between a transverse member secured to the vertical spline member or members and the top spacer member 8. This achieves good electrical connection between all the workpieces and the support member 2, carrying the contact pins 3.
  • the necessary clamping pressure may be generated by means of a cranked lever, inserted between the transverse member and the top spacer, and maintained by the insertion of stepped wedges.
  • a single vertical spline member 1 is shown. This may be supplemented by a second vertical member inserted at the location shown in Figure 2. This is particularly suitable where clamping of workpieces is effected by leverage and insertion of stepped wedges.
  • the construction of the invention may also be employed with equal advantage in a jig structure, in which one or more support members are arranged to extend transversely between two or even more vertical current-carrying members arranged at the ends of the jig, for example at the positions indicated in chain lines at 11 in Figure 2 to replace the vertical member or members 1.
  • the flight bar can be replaced by another form of overhead support where appropriate.
  • longitudinal structural members may be included to extend between the lower ends of the current-carrying members at opposite ends of the jig.

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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)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Physical Vapour Deposition (AREA)
  • Electroplating Methods And Accessories (AREA)

Claims (6)

1. Haltevorrichtung zur Halterung länglicher horizontaler Werkstücke in einem elektrolytischen Behandlungsbad, die eine Überkopf-Halterung (F) umfasst, die 'mindestens zwei vertikale stromführende Elemente (1) aufweist, die in Längsrichtung im Abstand voneinander liegen, wobei diese vertikalen Elemente (1) jeweils mindestens ein sich in Querrichtung erstreckendes Lastträgerelement (2) halten, das elektrisch mit dem vertikalen Element (1) verbunden ist, dadurch gekennzeichnet, dass jedes Lastträgerelement (2) mit mindestens einem sich nach oben erstreckenden Kontaktstift (3) versehen ist, dass jeder Kontaktstift eine oder mehrere Kontaktflächen (4) im Bereich des oberen Endes desselben aufweist, dass diese Kontaktfläche oder Kontaktflächen (4) in Anlage an einer entsprechenden Fläche oder entsprechenden Flächen (7) in einerAusnehmung (6) in einem Abstandselement (5) stehen, das über dem Lastträgerelement (2) liegt, und dass die Ausnehmung (6) mit solcher Tiefe bemessen ist, dass der Elektrolyt bei den im elektrolytischen Behandlungsbad auftretenden hydrostatischen Kräften nicht bis zum Niveau der Kontaktfläche oder den Kontaktflächen (7) ansteigen kann.
2. Haltevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeder Kontaktstift (3) mit Kontaktflächen (4) versehen ist, die gegenüber der Vertikalen und gegenüber einander geneigt sind.
3. Haltevorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass jeder Kontaktstift (3) in Längsrichtung seines Lastträgerelementes (2) länger ist als in Richtung der Breite dieses Lastträgerelementes.
4. Haltevorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass jedes Lastträgerelement (2) mindestens zwei Kontaktstifte (3) trägt.
5. Haltevorrichtung nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, dass jeder Kontaktstift (3) und die entsprechende Ausnehmung (6) derart bemessen sind, um ein zeitliches Spiel zwischen den Seiten des Kontaktstiftes (3) unterhalb der Kontaktflächen (4) und den anliegenden Seiten der Ausnehmung (6) zuzulassen.
6. Haltevorrichtung nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, dass jedes vertikale Element (1) und jedes Last- , trägerelement (2) mit einem flüssigkeitsbeständigen Kunststoff beschichtet oder in einen solchen eingebettet ist.
EP19830302729 1982-05-18 1983-05-13 Einspannvorrichtungen zum Tragen langgestreckter horizontaler Werkstücke beim Anodisieren und ähnlicher Verfahren Expired EP0094812B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8214436 1982-05-18
GB8214436 1982-05-18

Publications (2)

Publication Number Publication Date
EP0094812A1 EP0094812A1 (de) 1983-11-23
EP0094812B1 true EP0094812B1 (de) 1986-08-06

Family

ID=10530432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830302729 Expired EP0094812B1 (de) 1982-05-18 1983-05-13 Einspannvorrichtungen zum Tragen langgestreckter horizontaler Werkstücke beim Anodisieren und ähnlicher Verfahren

Country Status (6)

Country Link
EP (1) EP0094812B1 (de)
JP (1) JPS58207399A (de)
AU (1) AU1463283A (de)
DE (1) DE3365108D1 (de)
ES (1) ES522486A0 (de)
NZ (1) NZ204200A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117799A1 (de) * 1991-05-30 1992-12-03 Espili Amir Hassani Rahmenartiges gestell zur aufnahme von zu eloxierenden werkstuecken aus aluminium
DE4218182A1 (de) * 1992-06-02 1993-12-09 Stodal Ind Service Eggelsberg Vorrichtung zum Aufbringen galvanischer Überzüge

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2792004B1 (fr) * 1999-04-08 2002-02-15 Electro Rech Dispositif modulaire pour l'accrochage de pieces devant etre revetues de peinture par electrodeposition
GB0016960D0 (en) 2000-07-12 2000-08-30 Bae Systems Plc A jig and a method and appratus of applying a surface treatment to a member on the jig
ITVR20110079A1 (it) * 2011-04-22 2012-10-23 Girardini S R L Appendino per bilancella smontabile.
CN104762649A (zh) * 2015-03-30 2015-07-08 苏州市新鸿基精密部品有限公司 快速更换铝合金阳极氧化挂具
CN110257885A (zh) * 2019-07-31 2019-09-20 河池市机务材料有限公司 一种松孔镀铬电镀工具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT363749B (de) * 1979-03-02 1981-08-25 Kollmorgen Tech Corp Gestell mit einer klemmvorrichtung zur verwendung in metallisierungsbaedern
JPS5689327U (de) * 1979-12-13 1981-07-17
DE3017853A1 (de) * 1980-05-09 1981-11-12 Günther 7100 Heilbronn Strecker Galvanisiergestell mit gestellstab und gestellkopf
JPS5747123U (de) * 1980-08-30 1982-03-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117799A1 (de) * 1991-05-30 1992-12-03 Espili Amir Hassani Rahmenartiges gestell zur aufnahme von zu eloxierenden werkstuecken aus aluminium
DE4218182A1 (de) * 1992-06-02 1993-12-09 Stodal Ind Service Eggelsberg Vorrichtung zum Aufbringen galvanischer Überzüge

Also Published As

Publication number Publication date
NZ204200A (en) 1985-07-12
DE3365108D1 (en) 1986-09-11
ES8404425A1 (es) 1984-04-16
JPS58207399A (ja) 1983-12-02
AU1463283A (en) 1983-11-24
EP0094812A1 (de) 1983-11-23
ES522486A0 (es) 1984-04-16

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