EP0222087B1 - Installation de traitement électrolytique de pièces en vrac - Google Patents

Installation de traitement électrolytique de pièces en vrac Download PDF

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Publication number
EP0222087B1
EP0222087B1 EP86111907A EP86111907A EP0222087B1 EP 0222087 B1 EP0222087 B1 EP 0222087B1 EP 86111907 A EP86111907 A EP 86111907A EP 86111907 A EP86111907 A EP 86111907A EP 0222087 B1 EP0222087 B1 EP 0222087B1
Authority
EP
European Patent Office
Prior art keywords
goods
bath container
axis
support dish
base
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 - Lifetime
Application number
EP86111907A
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German (de)
English (en)
Other versions
EP0222087A1 (fr
Inventor
Siegfried Dr. Birkle
Johann Gehring
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.)
Siemens AG
Original Assignee
Siemens AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25836065&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0222087(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT86111907T priority Critical patent/ATE90742T1/de
Publication of EP0222087A1 publication Critical patent/EP0222087A1/fr
Application granted granted Critical
Publication of EP0222087B1 publication Critical patent/EP0222087B1/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
    • C25D17/16—Apparatus for electrolytic coating of small objects in bulk
    • C25D17/22—Apparatus for electrolytic coating of small objects in bulk having open containers
    • C25D17/24—Oblique barrels

Definitions

  • the electroplated goods In the case of bulk electroplating of bulk goods, the electroplated goods must be held together during the electroplating process so that each individual part has electrical contact. On the other hand, the electroplated material should be spread out as far as possible so that the metal can be deposited on the largest possible surface of the goods and the most uniform current density possible on all parts. These two requirements must be met by the goods container.
  • a further essential prerequisite for achieving perfect metal coatings with a uniform layer thickness is the sufficient mixing of the electroplated material during the electroplating. This mixing of the electroplating material is usually done by rotating the product container around a non-vertical one Axis brought about, whereby depending on the shape and wall friction, the individual parts are more or less conveyed upwards and then roll or slide down again.
  • the simplest container is the electroplating bell, a rotating pot that also serves as a bath container. Mixing of the electroplating material is achieved by rotating the bell, tilted against the vertical. Since the anode is hooked into the bell, the anode surface is usually too small in relation to the product surface even when using profiled special anodes. However, this then leads to low deposition rates and thus to an increase in the electroplating time and an increase in abrasion.
  • Galvanizing drums are also frequently used for mass electroplating, which, in contrast to the bell, only serve as a goods container and are arranged in a bath container.
  • the electroplating material is mixed by rotating the electroplating drums around a horizontal axis. Since the anodes are located outside the drum body, larger anode surfaces can be realized.
  • a perforation must be made in the jacket of the drum body for the passage of current between the anodes and the electroplated material.
  • the open cross-section of such a perforation available for the passage of current is for reasons of strength and dimensioned so small with regard to the size of the electroplating material that there is a considerable impairment of the passage of current.
  • a device in which the goods carrying tray is provided with straight ribs in its interior, which favor a uniform distribution of the pourable goods on the bottom of the goods carrying tray.
  • the ribs take the pourable material with them when the goods carrier pan rotates upwards, ie the degree of expansion based on the bottom of the goods carrier pan is increased considerably by the ribs.
  • Both the product tray and a container for receiving the finished galvanized goods are pivoted about a common shaft mounted above the bath container in such a way that both containers can be brought into such a mutual position that the pourable material is emptied from the product carrier into the receiving container and this can be swiveled out of the electrolyte while the product carrier is being returned to the working position.
  • Aluminum deposited from aprotic, oxygen and water-free, organoaluminum electrolytes is characterized by its ductility, low pore density, corrosion resistance and anodizing ability. Since the entry of air through reaction with atmospheric oxygen and air humidity causes a considerable reduction in the conductivity and service life of these electrolytes, the electroplating must be carried out in an air-tight facility. This also applies to the loading and unloading of these air-tight devices the entry of air can be prevented, import and export locks are also required, which are designed as gas locks, as liquid locks or as combined gas-liquid locks. When mass-aluminizing using aprotic, oxygen-free and water-free, aluminum-organic electrolytes, there is also the problem of preventing air from entering the electrolyte as far as possible.
  • a device for the galvanic deposition of aluminum from oxygen- and water-free, aluminum-organic electrolytes in which a galvanizing drum rotatable about its horizontal axis is arranged in a gas-tight sealable bath container.
  • the galvanized drum which is perforated, is surrounded by two anodes, which can be adjusted so that they form an opening for the bulk material to be emptied.
  • the electroplating drum is loaded by means of a transport device which leads into the interior of the bath container via a lock and which ends above a closable opening of the electroplating drum, the opening and closing of the electroplating drum being carried out from the outside.
  • a discharge container designed as an export lock, which is arranged below the bath container and communicates with it via a lockable, tubular connecting piece.
  • the object of the invention is to further improve the degree of spreading of the pourable material in relation to the bottom of the product carrier shell in a device of the type mentioned at the outset.
  • the device should also be designed so that it can be operated with a justifiable, additional effort in the absence of air and can be used for mass aluminization using aprotic, oxygen and water-free, organoaluminum electrolytes.
  • the driver is formed by a spiral track.
  • a spiral track acts as a transport device which constantly conveys the pourable material from the lower areas of the goods carrying tray to the upper areas.
  • the spiral track also promoting the mixing of the goods to a large extent.
  • the web can be formed in a particularly simple manner by means of a profile introduced into the bottom of the goods carrier. With a profile that is sawtooth-shaped in cross-section, it is then possible in particular to further improve the carry-along of the goods into the higher regions of the product carrying tray.
  • the bottom of the product carrier can also be perforated.
  • an additional anode can be arranged below the bottom and parallel to the bottom. As a result, the anode surface area is increased still further, so that particularly high deposition rates can be achieved.
  • a slide for the discharge of the goods is arranged in the peripheral wall of the product carrier. If this slide is opened in the lowest position of its orbit, the product carrying tray is emptied automatically.
  • the angle of inclination of the axis of the goods carrier shell to the horizontal is approximately 30 to 38 °.
  • the angle of inclination of the axis of the product carrier shell to the horizontal can be adjusted, particularly good adaptation to the requirements of the respective electroplating material is made possible with regard to the spreading and mixing.
  • the angle of inclination of the axis can then preferably be adjusted via the inclined position of the entire bath container. This takes into account the fact that when the axis is adjusted, the parallel orientation of the anode to the bottom of the carrier pan is to be maintained.
  • the inclined position of the entire bath container can then be used to ensure a synchronous adjustment of the product support shell and anode in a particularly simple manner.
  • the bath container is expediently pivotably arranged on a frame.
  • the device according to the invention can be used with relatively little additional effort for mass aluminization using aprotic, oxygen and water-free, organoaluminum electrolytes. This is achieved in that the bath container can be closed gas-tight and that locks are provided for the introduction and discharge of the goods.
  • the bath container is then preferably provided with a lid arranged in the region of the anode, so that the anode is easily accessible when the lid is open and can be exchanged without problems if necessary.
  • FIG. 1 and 2 show a device for the mass aluminization of pourable material G in the partially broken top view or in longitudinal section.
  • an aprotic, oxygen- and water-free, aluminum-organic electrolyte In an arranged obliquely on a frame Ge and gas-tightly sealed with the aid of a lid D there is an aprotic, oxygen- and water-free, aluminum-organic electrolyte, the area above the electrolyte level Esp being covered with an inert gas, such as, for. B. nitrogen is applied.
  • the pourable material G to be aluminized which is, for example, screws, nuts, bolts, spacer bushings and the like, is conveyed via a 2 only indicated hatch Es and an adjoining inclined downpipe Fr are introduced into the bath container Bb and then falls onto the bottom B of a goods carrying tray, generally designated W, which is completely immersed in the electrolyte.
  • the goods carrier W has the shape of an extremely flat circular cylinder, the peripheral wall of which is designated Wa.
  • the goods carrying tray W When loading the goods carrying tray W with the goods to be electroplated and during electroplating operation, the goods carrying tray W is rotated in the direction of the arrow U about its axis Ac, which is inclined to the horizontal.
  • the corresponding drive shaft Aw of the product carrier Wl is firmly connected to the base B, is passed gas and liquid-tight through the wall of the bath container Bb and is mounted in a bearing housing Lg attached to the wall of the bathroom container Bb from the outside.
  • the drive assigned to the drive shaft Aw is not shown in the drawing.
  • FIG. 2 A disk-shaped anode A arranged at a short distance parallel to the bottom B and thus also to the spread material G is only indicated schematically in FIG. 2.
  • the insulated fastening of this anode A which consists of pure aluminum and is composed of several segments, in the bath container Bb does not appear from FIG. 2. However, it can be seen that the anode A can be easily replaced when the cover D is open.
  • the bath container Bb is arranged obliquely on a frame Ge, wherein the inclination can be changed by pivoting the entire bath container Bb.
  • the lower part of the bath container Bb is articulated to the frame Ge via an axis of rotation Da, while a pneumatically or hydraulically actuated adjusting cylinder Vz is articulated to the upper region of the bath container Bb via a first pivot point Dp1 and to the frame Ge via a second pivot point Dp2 is.
  • the inclination can be adjusted via the adjusting cylinder Vz of the container Bb and thus also the angle of inclination ⁇ of the axis Ac of the goods carrier Wl to the horizontal. Possibly. the angle of inclination ⁇ is also reduced when the goods carrying tray W is emptied.
  • the speed and the angle of inclination ⁇ can be matched to the material G to be aluminized in such a way that the completely uniform spreading of the material G shown in FIG. 1 results.
  • This optimal spreading of the material G is also brought about by a driver, the mode of operation of which is explained with reference to FIG. 3.
  • Fig. 3 shows that the bottom B of the goods tray W is provided with a sawtooth-shaped profile in cross section, which forms a path Ba running in the form of a spiral.
  • This spiral path Ba forms an optimally acting driver, which in turn forms a conveying device by the rotation of the goods carrying tray W, which transports the goods G from the lower area into the upper area of the goods carrying tray W. In the upper area, the material G then slides over the inclined flanks of the sawtooth-shaped profile, which results in very good mixing.
  • an inclination angle .alpha. and a rotational speed can be set for each good G, at which the good G is spread almost completely over the entire bottom surface of the goods carrying tray W with very thorough mixing.
  • a perforation P can be made in the bottom B of the goods carrying tray W, through which the electrolyte exchange is further improved.
  • an additional anode ZA can then be arranged at a distance parallel to the bottom B, which, like the anode A likewise only indicated, consists of pure aluminum and is composed of several segments.
  • the perforation P and the additional anode ZA further improve the passage of current and bring about an additional increase in the deposition rates.
  • Multiple arrangements of goods trays W which can be rotated together are also conceivable, in which case the additional anode ZA then serves simultaneously as the main anode of the subsequent goods tray W.

Claims (11)

  1. Installation de traitement électrolytique de pièces en vrac, notamment de dépôt par électrolyse d'aluminium dans des électrolytes alumino-organiques, aprotiques, exempts d'oxygène et anhydres, comprenant
    - une cuve de réception d'un bain d'électrolyte,
    - une cuvette porte-objet plongeant dans l'électrolyte et pouvant tourner par rapport à son axe incliné sur l'horizontale,
    - au moins une anode en forme de disque, plongeant dans l'électrolyte et dirigée au moins sensiblement parallèlement au fond de la cuvette porte-objet, et
    - au moins un dispositif d'entraînement en forme de spirale destiné à disperser le produit en vrac sur le fond de la cuvette porte-objet,
       caractérisée,
       en ce que le dispositif d'entraînement est formé par une voie (Ba) qui tourne autour de l'axe (Ac) sous la forme d'une spirale ayant un grand nombre de spires devenant de plus en plus larges.
  2. Installation suivant la revendication 1,
       caractérisée,
       en ce que la voie (Ba) est formée d'un profilé placé sur le fond (B) de la cuvette (W) porte-objet.
  3. Installation suivant la revendication 2,
       caractérisée,
    par un profilé de section transversale en forme de dents de scie.
  4. Installation suivant l'une des revendications précédentes,
       caractérisée,
       en ce que le fond (B) de la cuvette (W) porte-objet est muni d'une perforation (P).
  5. Installation suivant la revendication 4,
       caractérisée,
       en ce qu'en-dessous du fond (B) est montée une anode supplémentaire (ZA) disposée à une certaine distance parallèlement au fond (B).
  6. Installation suivant l'une des revendications précédentes,
       caractérisée,
       en ce que l'angle (α) d'inclinaison de l'axe (Ac) de la cuvette (W) porte-objet sur l'horizontale est compris entre 30 et 38° environ.
  7. Installation suivant l'une des revendications précédentes,
       caractérisée,
       en ce que l'angle (α) d'inclinaison de l'axe (Ac) de la cuvette (W) porte-objet avec l'horizontale est réglable.
  8. Installation suivant la revendication 7,
       caractérisée,
       en ce que l'angle (α) d'inclinaison de l'axe (Ac) peut être réglé par la position inclinée de toute la cuve (Bb) pour le bain.
  9. Installation suivant la revendication 8,
       caractérisée,
       en ce que la cuve (Bb) pour le bain est montée basculante sur un bâti (Ge).
  10. Installation suivant l'une des revendications précédentes,
       caractérisée,
       en ce que la cuve (Bb) du bain peut être fermée d'une manière étanche au gaz et en ce qu'il est prévu des sas (Es, As) pour introduire et pour décharger le produit (G).
  11. Installation suivant la revendication 10,
       caractérisée,
       en ce que la cuve (Bb) pour le bain est munie d'un couvercle (D) disposé dans la région de l'anode (A).
EP86111907A 1985-09-17 1986-08-28 Installation de traitement électrolytique de pièces en vrac Expired - Lifetime EP0222087B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111907T ATE90742T1 (de) 1985-09-17 1986-08-28 Einrichtung fuer die massengalvanisierung von schuettfaehigem gut.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3533151 1985-09-17
DE3533151 1985-09-17
DE3616429 1986-05-15
DE3616429 1986-05-15

Publications (2)

Publication Number Publication Date
EP0222087A1 EP0222087A1 (fr) 1987-05-20
EP0222087B1 true EP0222087B1 (fr) 1993-06-16

Family

ID=25836065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111907A Expired - Lifetime EP0222087B1 (fr) 1985-09-17 1986-08-28 Installation de traitement électrolytique de pièces en vrac

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US (1) US4696728A (fr)
EP (1) EP0222087B1 (fr)
CA (1) CA1315238C (fr)
DE (1) DE3688583D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110340467A (zh) * 2019-06-28 2019-10-18 南京航空航天大学 开口对称式阴极榫槽电解加工装置及方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992145A (en) * 1989-12-27 1991-02-12 Ford Motor Company Electroplating of precision parts
US4946572A (en) * 1989-12-27 1990-08-07 Ford Motor Company Electroplating of precision parts
US6228230B1 (en) 1999-04-19 2001-05-08 Aem, Inc. Electroplating apparatus
CN103484926A (zh) * 2013-09-09 2014-01-01 浙江英洛华磁业有限公司 滚筒活动门

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE830862C (de) * 1950-10-20 1952-02-07 Friedr Blasberg Fa Apparat zur Massenverchromung
GB1110966A (en) * 1964-09-04 1968-04-24 Sel Rex Corp Electroplating or other electrolytic treatment of small parts
DE3023129C2 (de) * 1980-06-20 1982-04-15 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum galvanischen Abscheiden von Aluminium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110340467A (zh) * 2019-06-28 2019-10-18 南京航空航天大学 开口对称式阴极榫槽电解加工装置及方法

Also Published As

Publication number Publication date
EP0222087A1 (fr) 1987-05-20
CA1315238C (fr) 1993-03-30
US4696728A (en) 1987-09-29
DE3688583D1 (de) 1993-07-22

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