EP0664162A1 - Device for treating workpieces of special shape - Google Patents

Device for treating workpieces of special shape Download PDF

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Publication number
EP0664162A1
EP0664162A1 EP95420011A EP95420011A EP0664162A1 EP 0664162 A1 EP0664162 A1 EP 0664162A1 EP 95420011 A EP95420011 A EP 95420011A EP 95420011 A EP95420011 A EP 95420011A EP 0664162 A1 EP0664162 A1 EP 0664162A1
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EP
European Patent Office
Prior art keywords
parts
box
treated
grids
treatment
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
EP95420011A
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German (de)
French (fr)
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EP0664162B1 (en
Inventor
Didier Marhoffer
Ennemand Polus
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TECHNIQUES SURFACES SA
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TECHNIQUES SURFACES SA
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Publication of EP0664162A1 publication Critical patent/EP0664162A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
    • B05C3/10—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles the articles being moved through the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C13/00—Means for manipulating or holding work, e.g. for separate articles
    • B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
    • B05C13/025—Means for manipulating or holding work, e.g. for separate articles for particular articles relatively small cylindrical objects, e.g. cans, bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material

Definitions

  • the invention relates to the technical sector of the treatment of metal parts, more particularly methods of modifying surfaces made in the liquid phase.
  • the parts are attached to specific assemblies.
  • This technique is particularly applicable in the case of large parts or for small series. With this technique, it appears that the contact zone between the assembly and the part is isolated from the reaction medium, so that at this level area, treatment is poorly done or even not performed at all.
  • the parts are arranged in bulk inside a rotating barrel.
  • the parts collide which is a source of scratches and defects themselves generating chipping or pitting corrosion.
  • EP 0399349 discloses a device for treating cylindrical parts, used in the electronic industry. This device consists of trays inclined to the vertical, mounted on a rotary horizontal axis. These plates have points implanted perpendicular to their surface and capable of receiving the cylindrical parts. When the axis rotates, the workpieces rotate around the tips and change orientation.
  • this device operates with the continuous rotation of the cylindrical parts around the points, which generate friction on the periphery of each part.
  • the parts to be treated may get stuck and therefore not turn on themselves. For this reason, it is necessary to tilt the trays receiving the parts at an angle between 60 ° and 75 °. Given such an orientation of the plates, it appears that a generator of the bore of the part will not be treated, since it will be masked by the tip.
  • the object of the invention is to remedy these drawbacks in a simple, safe, effective and rational manner.
  • the problem which the invention proposes to solve is to be able to apply a phosphating or other treatment process, in the case of parts of complex shapes with the aim of to obtain a treatment of very good quality on all of the different zones of the parts, which must not have contact with each other during the treatment, with the further objective of avoiding masking any zone of the part during the treatment and finally to be able to very easily dispose of the parts to be treated.
  • a device for the treatment of specially shaped parts, which comprises support grids equipped with means able to allow centering and positioning in an orderly manner with limited displacement capacity, parts to be treated, without contact with each other, said grids being arranged in horizontal parallel rows, in an openwork box immersed in a treatment bath and subject to rotation drive means.
  • the grids are spaced at a determined interval to leave an empty space above the parts to be treated, to allow them to move. by gravity with respect to the centering means at the time of rotation of the box.
  • the centering and positioning means are constituted by pins integral with the support grids, and whose section is shaped to cooperate with the bore of the parts to be treated.
  • the pins can be arranged so as to cooperate with the outside of the part.
  • the box has mesh walls and is positively driven in rotation, by means of a motor member controlled by a control unit.
  • Figure 1 is a longitudinal sectional view of an embodiment of a part to be treated.
  • Figure 2 is a schematic longitudinal sectional view of the support grids equipped for positioning and centering of the parts to be treated.
  • FIG. 3 is a plan view corresponding to FIG. 2.
  • Figure 4 is a longitudinal sectional view of the box equipped with different grids and immersed in the phosphating bath.
  • Figure 5 is a view corresponding to Figure 4, during the rotation of the boxes.
  • Figure 6 is a cross-sectional view taken along line 6.6 of Figure 4.
  • the device according to the invention essentially comprises a box (1) in which are mounted support grids (2) equipped with means (3) capable of allowing centering and positioning in an orderly manner parts to be treated (4).
  • the entire box (1) with the grids (2) is immersed in a bath (B).
  • the walls (1a) of the box (1) are perforated to allow the pieces (4) positioned on the grids (2) to be immersed in the bath (B).
  • all of the walls (1a) of the box (1) are screened.
  • This box (1) can have a generally parallelepiped shape.
  • this box (1) is shaped to be rotated by any known and appropriate means.
  • the box (1) is driven by means of a motor member controlled by a control unit.
  • the centering and positioning means (3) consist of pins integral with the support grids (2). These pins (3) are shaped in section, to cooperate with the bore (4a) of the parts to be treated, while allowing limited movement of the parts, relative to said pins.
  • the centering pins (3) allow, during the rotational drive of the box (1), corresponding to the treatment to be carried out, the movement of the parts (4) to allow them to be treat in their entire area, avoiding any contact between said parts that could adversely affect the quality of the treatment.
  • the grids (2) are arranged in parallel rows in the box (1).
  • the box (1) has any type of arrangement allowing, on the one hand, the introduction and removal at will of the grids and, on the other hand, the positioning of the grids inside the box, according to determined and variable intervals (E).
  • the intervals (E) are determined as a function of the height (H) of the parts to be treated, to leave an empty space between the upper part of the parts and the grid located immediately above. This space allows the displacement by gravity of the parts (4), relative to their means of centering and positioning (3), at the time of rotation of the box or not.
  • the grids (2) are arranged in a horizontal plane.
  • the device according to the invention finds a particularly advantageous application for the treatment of parts of complex shapes, such as those illustrated in FIG. 1.
  • the part (4) is in the form of a hollow cylindrical body with, in its upper part, a circular peripheral rim (4b) internally curved constituting a flange.
  • the parts (4) are positioned in an orderly fashion on the support grids (2) while being centered on the pins (3).
  • the different grids (2) are positioned inside the box (1) respecting the intervals (E) to obtain the spaces (e).
  • the entire box thus equipped is immersed in the bath (B) ( Figures 4 and 6).
  • the rate of rejects is only between 1 and 3%.
  • the device according to the invention is applicable for the treatment of other types of parts such as hydraulic components for portable tools of the pruning type and of a generally cylindrical shape, of reduced diameter, and having a coaxial bore of reduced diameter.
  • the positioning and centering of the parts under the conditions indicated above, that is to say with limited displacement capacity, are carried out by pins cooperating with the outside of the part, to allow filling of the by the bath.

Landscapes

  • Chemical Treatment Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

The workpiece holder consists of a perforated container (1) with inner horizontal grilles (2) carrying supports (3) for the workpieces (4), and with the container rotatable in a treatment bath (B). The grilles are set at intervals (E) which leave a gap (e) above the workpieces being treated so that they can move by gravity on the supports as the holder rotates. The workpiece supports can be shaped to engage either with the inner or outer surfaces of the workpieces. The container can be rotated inside the bath by a drive, e.g. comprising a motor and control unit.

Description

L'invention se rattache au secteur technique du traitement des pièces métalliques, plus particulièrement des procédés de modification des surfaces réalisés en phase liquide.The invention relates to the technical sector of the treatment of metal parts, more particularly methods of modifying surfaces made in the liquid phase.

Plus particulièrement, l'invention trouve des applications avantageuses dans le cas de traitements par phosphatation, sans pour cela exclure d'autres applications telles que :

  • préparation de surfaces quelconques, notamment dégraissage, décapage chimique ou électrochimique, attaque chimique ou électrochimique,
  • revêtements de surfaces, notamment dépôts de métaux ou d'alliages par voie chimique ou électrochimique, dépôts au trempé, dépôt par électrophorèse, imprégnations ou enduits,
  • traitements de surfaces, notamment:
    • * par conversion : phosphatation, sulfuration en bain de sels fondus, oxydation anodique, oxydation en bain de sels.
    • * thermochimiques de diffusion de métalloïdes en bains de sels fondus : nitruration, cémentation, carbonitruration.
More particularly, the invention finds advantageous applications in the case of phosphating treatments, without thereby excluding other applications such as:
  • preparation of any surfaces, in particular degreasing, chemical or electrochemical pickling, chemical or electrochemical attack,
  • surface coatings, in particular deposition of metals or alloys by chemical or electrochemical means, dip deposits, electrophoresis deposition, impregnations or coatings,
  • surface treatments, in particular:
    • * by conversion: phosphating, sulfurization in a bath of molten salts, anodic oxidation, oxidation in a salt bath.
    • * thermochemical diffusion of metalloids in molten salt baths: nitriding, carburizing, carbonitriding.

Généralement, on utilise essentiellement trois techniques pour supporter et manipuler les pièces pendant les opérations de traitements de revêtements ou de préparations des surfaces en milieu liquide.Generally, three techniques are essentially used to support and manipulate the parts during the operations of coating treatments or surface preparations in liquid medium.

Selon une première technique, les pièces sont attachées sur des montages spécifiques. Cette technique s'applique notamment dans le cas de pièces de grandes dimensions ou pour des petites séries. Avec cette technique, il apparait que la zone de contact entre le montage et la pièce est isolée du milieu réactionnel, de sorte qu'au niveau de cette zone, le traitement s'effectue mal ou même ne s'effectue pas du tout.According to a first technique, the parts are attached to specific assemblies. This technique is particularly applicable in the case of large parts or for small series. With this technique, it appears that the contact zone between the assembly and the part is isolated from the reaction medium, so that at this level area, treatment is poorly done or even not performed at all.

Ces inconvénients se retrouvent dans une autre technique, selon laquelle, les pièces à traiter sont posées dans le fond d'un panier, généralement en treillis métalliques, ou accrochées à ses parois.These drawbacks are found in another technique, according to which, the parts to be treated are placed in the bottom of a basket, generally in wire mesh, or hung on its walls.

Enfin, selon une autre technique, généralement réservée aux séries importantes de pièces de petite dimension, les pièces sont disposées en vrac à l'intérieur d'un tonneau tournant. Les pièces s'entrechoquent ce qui est source de rayures et de défauts eux même générateurs d'écaillage ou de piqûres de corrosion.Finally, according to another technique, generally reserved for large series of small parts, the parts are arranged in bulk inside a rotating barrel. The parts collide which is a source of scratches and defects themselves generating chipping or pitting corrosion.

Enfin, ces différentes techniques ne permettent pas de traiter de manière satisfaisante, des pièces présentant des zones de formes complexes, difficilement accessibles au milieu liquide, telles que des poches à ouverture orientée vers le bas, susceptibles d'emprisonner des bulles gazeuses entrainant des manques de dépôts, des dégraissages, des rinçages imparfaits... Le traitement obtenu n'est donc pas de qualité suffisante et sa reproductibilité est médiocre.Finally, these different techniques do not make it possible to treat satisfactorily, parts having zones of complex shapes, difficult to access in the liquid medium, such as pockets with opening oriented downwards, capable of trapping gas bubbles causing gaps. deposits, degreases, imperfect rinses ... The treatment obtained is therefore not of sufficient quality and its reproducibility is poor.

Par exemple, dans le cas de pièces à traiter de formes similaires à celles illustrées figure 1, et disposées dans un panier, on observe des manques de traitement dans les zones de rétention, de bulles d'air au niveau de la collerette. Il en résulte des résultats très aléatoires quant à la résistance et à la corrosion des pièces traitées, entrainant ainsi des rebuts importants. Par exemple on a observé que, dans le cas d'un traitement de phosphatation, sur deux lots de 1000 pièces, traités chacun en deux charges de 500 pièces, on a 50% de rebuts pour le premier lot et 80% pour le second lot.For example, in the case of parts to be treated with shapes similar to those illustrated in FIG. 1, and arranged in a basket, there are lack of treatment in the retention zones, of air bubbles at the level of the collar. This results in very random results as to the resistance and corrosion of the treated parts, thus causing significant waste. For example, it has been observed that, in the case of a phosphating treatment, on two batches of 1000 pieces, each treated in two charges of 500 pieces, there is 50% of scrap for the first batch and 80% for the second batch .

Dans le cas d'un traitement en vrac de ce type de pièces, le traitement est correct mais les pièces sont soumises, comme indiqué précédemment, à des chocs provoquant des rayures non admisibles.In the case of bulk processing of this type of parts, the treatment is correct but the parts are subjected, as indicated above, to shocks causing inadmissible scratches.

Par le brevet EP 0399349, on connaît un dispositif de traitement de pièces cylindriques, utilisées dans l'industrie électronique. Ce dispositif se compose de plateaux inclinés par rapport à la verticale, montés sur un axe horizontal rotatif. Ces plateaux présentent des pointes implantées perpendiculairement à leur surface et aptes à recevoir les pièces cylindriques. Lors du mouvement de rotation de l'axe, les pièces à traiter tournent autour des pointes et changent d'orientation.EP 0399349 discloses a device for treating cylindrical parts, used in the electronic industry. This device consists of trays inclined to the vertical, mounted on a rotary horizontal axis. These plates have points implanted perpendicular to their surface and capable of receiving the cylindrical parts. When the axis rotates, the workpieces rotate around the tips and change orientation.

Il est donc nécessaire de prévoir des éléments d'entrainement particuliers pour les axes, en raison des caractéristiques chimiques, dans les bains dans lesquels ils sont plongés.It is therefore necessary to provide special drive elements for the axes, due to the chemical characteristics, in the baths in which they are immersed.

Il apparait donc que ce dispositif fonctionne avec la rotation continue des pièces cylindriques autour des pointes, ce qui engendrent des frottements sur la périphérie de chaque pièce. En outre, on ne peut exclure que les pièces à traiter puissent se coincer et donc ne pas tourner sur elles-même. Pour cette raison, il est nécessaire d'incliner les plateaux recevant les pièces d'un angle compris entre 60° et 75°. Compte-tenu d'une telle orientation des plateaux, il apparait qu'une génératrice de l'alésage de la pièce ne sera pas traitée, étant donné qu'elle sera masquée par la pointe.It therefore appears that this device operates with the continuous rotation of the cylindrical parts around the points, which generate friction on the periphery of each part. In addition, it cannot be excluded that the parts to be treated may get stuck and therefore not turn on themselves. For this reason, it is necessary to tilt the trays receiving the parts at an angle between 60 ° and 75 °. Given such an orientation of the plates, it appears that a generator of the bore of the part will not be treated, since it will be masked by the tip.

L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre, efficace et rationnelle.The object of the invention is to remedy these drawbacks in a simple, safe, effective and rational manner.

Le problème que se propose de résoudre l'invention est de pouvoir appliquer un procédé de traitement de phosphatation ou autres, dans le cas de pièces de formes complexes en ayant pour objectif d'obtenir un traitement de très bonne qualité sur la totalité des différentes zones des pièces, qui ne doivent pas avoir de contact entre elles lors du traitement, en ayant par ailleurs pour objectif d'éviter de masquer une zone quelconque de la pièce pendant le traitement et enfin de pouvoir disposer très facilement les pièces à traiter.The problem which the invention proposes to solve is to be able to apply a phosphating or other treatment process, in the case of parts of complex shapes with the aim of to obtain a treatment of very good quality on all of the different zones of the parts, which must not have contact with each other during the treatment, with the further objective of avoiding masking any zone of the part during the treatment and finally to be able to very easily dispose of the parts to be treated.

Pour résoudre un tel problème il a été conçu et mis au point un dispositif pour le traitement de pièces de forme spéciale, qui comprend des grilles support équipées de moyens aptes à permettre le centrage et le positionnement de manière ordonnée avec capacité de déplacement limité, des pièces à traiter, sans contact entre elles, lesdites grilles étant disposées par rangées parallèles horizontales, dans un caisson ajouré immergé dans un bain de traitement et assujetti à des moyens d'entraînement en rotation.To solve such a problem, a device has been designed and developed for the treatment of specially shaped parts, which comprises support grids equipped with means able to allow centering and positioning in an orderly manner with limited displacement capacity, parts to be treated, without contact with each other, said grids being arranged in horizontal parallel rows, in an openwork box immersed in a treatment bath and subject to rotation drive means.

Pour résoudre le problème posé de pouvoir traiter les pièces dans leur totalité, y compris les zones de formes complexes difficilement accessibles, les grilles sont espacées selon un intervalle déterminé pour laisser subsister un espace vide au dessus des pièces à traiter, pour leur permettre un déplacement par gravité par rapport au moyen de centrage au moment de la rotation du caisson.To solve the problem posed of being able to treat the parts in their entirety, including areas of complex shapes which are difficult to access, the grids are spaced at a determined interval to leave an empty space above the parts to be treated, to allow them to move. by gravity with respect to the centering means at the time of rotation of the box.

Pour résoudre le problème posé du positionnement des pièces de manière ordonnée, les moyens de centrage et de positionnement sont constitués par des pions solidaires des grilles support, et dont la section est conformée pour coopérer avec l'alésage des pièces à traiter.To resolve the problem posed of positioning the parts in an orderly manner, the centering and positioning means are constituted by pins integral with the support grids, and whose section is shaped to cooperate with the bore of the parts to be treated.

En fonction des pièces à traiter, les pions peuvent être disposés de manière à coopérer avec l'extérieur de la pièce.Depending on the parts to be treated, the pins can be arranged so as to cooperate with the outside of the part.

Le caisson présente des parois grillagées et est entrainé positivement en rotation, au moyen d'un organe moteur asservi à une centrale de commande.The box has mesh walls and is positively driven in rotation, by means of a motor member controlled by a control unit.

L'invention est exposée, ci-après plus en détail à l'aide des dessins annexés, dans lesquels:The invention is set out below in more detail using the appended drawings, in which:

La figure 1 est une vue en coupe longitudinale d'un exemple de réalisation d'une pièce à traiter.Figure 1 is a longitudinal sectional view of an embodiment of a part to be treated.

La figure 2 est une vue en coupe longitudinale à caractère schématique des grilles support équipées pour le positionnement et le centrage des pièces à traiter.Figure 2 is a schematic longitudinal sectional view of the support grids equipped for positioning and centering of the parts to be treated.

La figure 3 est une vue en plan correspondant à la figure 2.FIG. 3 is a plan view corresponding to FIG. 2.

La figure 4 est une vue en coupe longitudinale du caisson équipé des différentes grilles et immergé dans le bain de phosphatation.Figure 4 is a longitudinal sectional view of the box equipped with different grids and immersed in the phosphating bath.

La figure 5 est une vue correspondant à la figure 4, lors de la rotation des caissons.Figure 5 is a view corresponding to Figure 4, during the rotation of the boxes.

La figure 6 est une vue en coupe transversale considérée selon la ligne 6.6 de la figure 4.Figure 6 is a cross-sectional view taken along line 6.6 of Figure 4.

Comme le montre la figure 4, le dispositif selon l'invention comprend essentiellement un caisson (1) dans lequel sont montées des grilles support (2) équipées de moyens (3) aptes à permettre le centrage et le positionnement d'une manière ordonnée des pièces à traiter (4). L'ensemble du caisson (1) avec les grilles (2) est immergé dans un bain (B).As shown in Figure 4, the device according to the invention essentially comprises a box (1) in which are mounted support grids (2) equipped with means (3) capable of allowing centering and positioning in an orderly manner parts to be treated (4). The entire box (1) with the grids (2) is immersed in a bath (B).

Les parois (1a) du caisson (1) sont ajourées pour permettre l'immersion des pièces (4) positionnées sur les grilles (2), dans le bain (B). Par exemple la totalité des parois (1a) du caisson (1) sont grillagées. Ce caisson (1) peut avoir une forme générale parallèlépipédique. Enfin, ce caisson (1) est conformé pour être entrainé en rotation par tout moyen connu et approprié. Par exemple, le caisson (1) est entrainé au moyen d'un organe moteur asservi à une centrale de commande.The walls (1a) of the box (1) are perforated to allow the pieces (4) positioned on the grids (2) to be immersed in the bath (B). For example, all of the walls (1a) of the box (1) are screened. This box (1) can have a generally parallelepiped shape. Finally, this box (1) is shaped to be rotated by any known and appropriate means. For example, the box (1) is driven by means of a motor member controlled by a control unit.

Les moyens de centrage et de positionnement (3) sont constitués par des pions solidaires des grilles support (2). Ces pions (3) sont conformés en section, pour coopérer avec l'alésage (4a) des pièces à traiter, tout en permettant un déplacement limité des pièces, par rapport auxdits pions.The centering and positioning means (3) consist of pins integral with the support grids (2). These pins (3) are shaped in section, to cooperate with the bore (4a) of the parts to be treated, while allowing limited movement of the parts, relative to said pins.

Comme il sera indiqué dans la suite de la description, les pions de centrage (3) permettent, lors de l'entrainement en rotation du caisson (1), correspondant au traitement à effectuer, le déplacement des pièces (4) pour permettre de les traiter dans la totalité de leur zone, en évitant tout contact entre lesdites pièces susceptible de nuire à la qualité du traitement.As will be indicated in the following description, the centering pins (3) allow, during the rotational drive of the box (1), corresponding to the treatment to be carried out, the movement of the parts (4) to allow them to be treat in their entire area, avoiding any contact between said parts that could adversely affect the quality of the treatment.

Les grilles (2) sont disposées par rangées parallèles, dans le caisson (1). Dans ce but, le caisson (1) présente tout type d'agencement permettant, d'une part, l'introduction et le retrait à volonté des grilles et, d'autre part, le positionnement des grilles à l'intérieur du caisson, selon des intervalles (E) déterminés et variables. A cet égard, les intervalles (E) sont déterminés en fonction de la hauteur (H) des pièces à traiter, pour laisser subsister entre la partie supérieure des pièces et la grille située immédiatement au dessus, un espace vide (e). Cet espace permet le déplacement par gravité des pièces (4), par rapport à leur moyen de centrage et de positionnement (3), au moment de la rotation du caisson ou non.The grids (2) are arranged in parallel rows in the box (1). For this purpose, the box (1) has any type of arrangement allowing, on the one hand, the introduction and removal at will of the grids and, on the other hand, the positioning of the grids inside the box, according to determined and variable intervals (E). In this respect, the intervals (E) are determined as a function of the height (H) of the parts to be treated, to leave an empty space between the upper part of the parts and the grid located immediately above. This space allows the displacement by gravity of the parts (4), relative to their means of centering and positioning (3), at the time of rotation of the box or not.

Avantageusement, les grilles (2) sont disposées selon un plan horizontal.Advantageously, the grids (2) are arranged in a horizontal plane.

Le dispositif selon l'invention trouve une application particulièrement avantageuse pour le traitement de pièces de formes complexes, telles que celles illustrées figure 1. Dans cet exemple de réalisation, la pièce (4) se présente sous forme d'un corps cylindrique creux avec, dans sa partie supérieure, un rebord périphérique circulaire (4b) recourbé intérieurement constituant une collerette.The device according to the invention finds a particularly advantageous application for the treatment of parts of complex shapes, such as those illustrated in FIG. 1. In this exemplary embodiment, the part (4) is in the form of a hollow cylindrical body with, in its upper part, a circular peripheral rim (4b) internally curved constituting a flange.

Il convient d'analyser le fonctionnement du dispositif selon l'invention.The operation of the device according to the invention should be analyzed.

Les pièces (4) sont positionnées de manière ordonnée sur les grilles support (2) en étant centrées sur les pions (3). Ainsi équipées, les différentes grilles (2) sont positionnées à l'intérieur du caisson (1) en respectant les intervalles (E) pour obtenir les espaces (e). L'ensemble du caisson ainsi équipé est immergé dans le bain (B) (figures 4 et 6).The parts (4) are positioned in an orderly fashion on the support grids (2) while being centered on the pins (3). Thus equipped, the different grids (2) are positioned inside the box (1) respecting the intervals (E) to obtain the spaces (e). The entire box thus equipped is immersed in the bath (B) (Figures 4 and 6).

Lors de l'entraînement en rotation du caisson (1), les pièces (4), centrées sur les pions (3) au delà d'une certaine position angulaire, ont tendance à glisser par gravité le long des pions (3). Les bases (4c) des pièces (4) décollent de la grille support (2) les recevant, de sorte que leurs parties supérieures (4b) viennent en contact avec la grille située en dessous (figure 5).During the rotational drive of the box (1), the parts (4), centered on the pins (3) beyond a certain angular position, tend to slide by gravity along the pins (3). The bases (4c) of the parts (4) take off from the support grid (2) receiving them, so that their upper parts (4b) come into contact with the grid located below (Figure 5).

Ces dispositions permettent donc de traiter la totalité des différentes zones des pièces (4). Par ailleurs, il est sans importance que les parties supérieures (4b) viennent en contact avec les grilles, lors de la rotation du caisson, étant donné que ces parties ont été soumises au traitement (B).These provisions therefore make it possible to treat all of the different areas of the parts (4). Furthermore, it does not matter that the upper parts (4b) come into contact with the grids, during the rotation of the box, since these parts have been subjected to treatment (B).

Par rapport à l'état de la technique et pour un traitement comme indiqué précédemment, de deux lots de 1000 pièces, traités chacun en deux charges de 500 pièces, le taux de rebuts se situe seulement entre 1 et 3 %.Compared to the state of the art and for a treatment as indicated above, of two batches of 1000 pieces, each treated in two charges of 500 pieces, the rate of rejects is only between 1 and 3%.

Bien évidemment, le dispositif selon l'invention s'applique pour le traitement d'autres types de pièces tels que des composants hydrauliques pour outillage portatifs du type sécateur et d'une forme générale cylindrique, de diamètre réduit, et présentant un alésage coaxial de diamètre réduit. Dans ce cas, le positionnement et le centrage des pièces dans les conditions indiquées précédemment, c'est-à-dire avec capacité de déplacement limité, sont effectués par des pions coopérant avec l'extérieur de la pièce, pour permettre le remplissage de l'alésage par le bain.Obviously, the device according to the invention is applicable for the treatment of other types of parts such as hydraulic components for portable tools of the pruning type and of a generally cylindrical shape, of reduced diameter, and having a coaxial bore of reduced diameter. In this case, the positioning and centering of the parts under the conditions indicated above, that is to say with limited displacement capacity, are carried out by pins cooperating with the outside of the part, to allow filling of the by the bath.

Ces pièces doivent résister à la fois à l'usure et à la corrosion, tout en conservant un bon état de surface au fil des manoeuvres et en ayant un bas coefficient de frottement.These parts must resist both wear and corrosion, while maintaining a good surface condition over the maneuvers and having a low coefficient of friction.

Une solution efficace pour satisfaire ces impératifs est de faire appel à un conditionnement de surface composite faisant appel à trois opérations successives :

  • une nitruration en bain de sels fondus à base de cyanates et carbonates alcalins qui apporte la résistance à l'usure,
  • une oxydation en bain de sels fondus à base de nitrates, carbonates et hydroxydes alcalins, qui améliore la résistance à la corrosion,
  • une enduction polymérique d'un composé organique à haut poids moléculaire type cire, dilué dans un solvant, qui vient imprégner les porosités superficielles créées par les deux précédentes opérations et favorise le glissement.
An effective solution to meet these requirements is to use composite surface conditioning using three successive operations:
  • nitriding in a bath of molten salts based on alkali cyanates and carbonates which provides resistance to wear,
  • oxidation in the bath of molten salts based on nitrates, carbonates and alkali hydroxides, which improves resistance to corrosion,
  • a polymeric coating of a high molecular weight organic compound such as wax, diluted in a solvent, which impregnates the superficial porosity created by the two previous operations and promotes sliding.

L'impératif de résistance à la corrosion impose que la pièce soit traitée dans sa totalité, la présence du plus petit défaut engendrant une piqûre de corrosion.The imperative of resistance to corrosion requires that the part be treated in its entirety, the presence of the smallest defect causing a pitting of corrosion.

Des essais comparatifs, à titre privé et expérimental, d'un traitement de lots de pièces (à raison de 100 pièces par charge), selon les techniques antérieures (panier et vrac) et selon l'invention, ont donné les résultats suivants : TECHNOLOGIE DE TRAITEMENT % DE PIECES PRESENTANT DES PIQURES DE CORROSION APRES 48 HEURES D'EXPOSITION AU BROUILLARD SALIN en panier 95 en vrac 85 selon l'invention 5 Comparative trials, on a private and experimental basis, of a treatment of batches of pieces (at the rate of 100 pieces per charge), according to the prior techniques (basket and bulk) and according to the invention, gave the following results: PROCESSING TECHNOLOGY % OF PIECES WITH CORROSION STITCHES AFTER 48 HOURS OF EXPOSURE TO SALT FOG in basket 95 loose 85 according to the invention 5

Les avantages ressortent bien de la description, en particulier on souligne et on rappelle :

  • aucun contact entre les pièces lors du traitement,
  • la qualité obtenue du traitement dans toutes les zones de la pièce, y compris dans les zones de rétention,
  • la simplicité de réalisation.
The advantages clearly emerge from the description, in particular it is emphasized and recalled:
  • no contact between parts during processing,
  • the quality obtained from the treatment in all areas of the room, including in the retention areas,
  • the simplicity of realization.

Claims (8)

-1- Dispositif pour le traitement de pièces de forme spéciale comprenant des grilles support (2) équipées de moyens (3) aptes à permettre le centrage et le positionnement de manière ordonnée avec capacité de déplacement limité, des pièces à traiter (4), sans contact entre elles, lesdites grilles (2) étant disposées par rangées parallèles horizontales, dans un caisson ajouré (1) immergé dans un bain de traitement (B) et assujetti à des moyens d'entraînement en rotation. -1- Device for the treatment of specially shaped parts comprising support grids (2) equipped with means (3) able to allow centering and positioning in an orderly manner with limited displacement capacity, of the parts to be treated (4), without contact with each other, said grids (2) being arranged in horizontal parallel rows, in an openwork box (1) immersed in a treatment bath (B) and subject to rotation drive means. -2- Dispositif selon la revendication 1, caractérisé en ce que les grilles (2) sont espacées selon un intervalle déterminé (E) pour laisser subsister un espace vide (e) au dessus des pièces à traiter, pour leur permettre un déplacement par gravité par rapport au moyen de centrage (3) au moment de la rotation du caisson (1). -2- Device according to claim 1, characterized in that the grids (2) are spaced at a determined interval (E) to leave an empty space (e) above the parts to be treated, to allow them to move by gravity relative to the centering means (3) at the time of rotation of the box (1). -3- Dispositif selon la revendication 1, caractérisé en ce que les moyens de centrage et de positionnement sont constitués par des pions (3) solidaires des grilles support (2). -3- Device according to claim 1, characterized in that the centering and positioning means are constituted by pins (3) integral with the support grids (2). -4- Dispositif selon la revendication 3, caractérisé en ce que la section des pions est conformée pour coopérer avec l'alésage des pièces à traiter. -4- Device according to claim 3, characterized in that the section of the pins is shaped to cooperate with the bore of the parts to be treated. -5- Dispositif selon la revendication 3, caractérisé en ce que les pions (3) sont disposés pour coopérer avec la périphérie externe des pièces à traiter. -5- Device according to claim 3, characterized in that the pins (3) are arranged to cooperate with the outer periphery of the parts to be treated. -6- Dispositif selon la revendication 1, caractérisé en ce que le caisson présente des agencements permettant l'introduction et retrait à volonté des grilles. -6- Device according to claim 1, characterized in that the box has arrangements for the introduction and removal at will of the grids. -7- Dispositif selon la revendication 1, caractérisé en ce que le caisson (1) présente des parois grillagées. -7- Device according to claim 1, characterized in that the box (1) has mesh walls. -8- Dispositif selon la revendication 1, caractérisé en ce que le caisson (1) est entrainé positivement en rotation, au moyen d'un organe moteur asservi à une centrale de commande. -8- Device according to claim 1, characterized in that the box (1) is driven positively in rotation, by means of a motor member slaved to a control unit.
EP19950420011 1994-01-19 1995-01-18 Device for treating workpieces of special shape Expired - Lifetime EP0664162B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9400790A FR2715146B1 (en) 1994-01-19 1994-01-19 Device for processing specially shaped parts.
FR9400790 1994-01-19

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EP0664162A1 true EP0664162A1 (en) 1995-07-26
EP0664162B1 EP0664162B1 (en) 1998-04-01

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EP (1) EP0664162B1 (en)
DE (1) DE69501900T2 (en)
ES (1) ES2115333T3 (en)
FR (1) FR2715146B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003105546A1 (en) * 2002-06-05 2003-12-18 Atotech Deutschland Gmbh Method and device for treating flat and flexible work pieces

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103233261B (en) * 2013-05-08 2016-06-22 江苏舜天新盈轻工业有限公司 A kind of electrophoresis hanger

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02166298A (en) * 1988-12-19 1990-06-26 Matsushita Electric Ind Co Ltd Method and device for plating
EP0399049A1 (en) * 1988-11-07 1990-11-28 Matsushita Electric Industrial Co., Ltd. Plating device for dielectric resonators

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399049A1 (en) * 1988-11-07 1990-11-28 Matsushita Electric Industrial Co., Ltd. Plating device for dielectric resonators
JPH02166298A (en) * 1988-12-19 1990-06-26 Matsushita Electric Ind Co Ltd Method and device for plating

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 431 (C - 0759) 17 September 1990 (1990-09-17) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003105546A1 (en) * 2002-06-05 2003-12-18 Atotech Deutschland Gmbh Method and device for treating flat and flexible work pieces

Also Published As

Publication number Publication date
EP0664162B1 (en) 1998-04-01
FR2715146B1 (en) 1996-02-16
ES2115333T3 (en) 1998-06-16
DE69501900D1 (en) 1998-05-07
FR2715146A1 (en) 1995-07-21
DE69501900T2 (en) 1998-07-30

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