EP0511062B1 - Method for sealing a device such as an induction coil - Google Patents
Method for sealing a device such as an induction coil Download PDFInfo
- Publication number
- EP0511062B1 EP0511062B1 EP92401090A EP92401090A EP0511062B1 EP 0511062 B1 EP0511062 B1 EP 0511062B1 EP 92401090 A EP92401090 A EP 92401090A EP 92401090 A EP92401090 A EP 92401090A EP 0511062 B1 EP0511062 B1 EP 0511062B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing
- coil
- induction coil
- overmoulding
- overmolding
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
Definitions
- the actual soaking may for example last a few seconds or a few tens of seconds, after which the part is removed and drained, and preferably pre-dried before cooking, for a few tens of minutes.
- FIG. 2 represents another coil 7, produced according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Induction Heating (AREA)
- Insulating Of Coils (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
Abstract
Description
La présente invention concerne un procédé d'étanchéification d'une pièce telle qu'une bobine d'induction.The present invention relates to a method of sealing a part such as an induction coil.
Les bobines d'induction, utilisées par exemple dans l'industrie automobile, sont généralement surmoulées, après leur fabrication, à l'aide d'une matière plastique destinée à lui donner ses cotes et son aspect définitifs.Induction coils, used for example in the automotive industry, are generally overmolded, after their manufacture, using a plastic material intended to give it its final dimensions and appearance.
Jusqu'à présent, ce surmoulage était réalisé directement sur la bobine, éventuellement après application d'un vernis de maintien du bobinage. L'inconvénient de ce procédé résidait dans le fait qu'il est pratiquement impossible de réaliser une bonne étanchéité entre la pièce, notamment dans ses parties en matière plastique, et le surmoulage, des infiltrations d'humidité pouvant par conséquent toujours se produire à ces interfaces. Ces défauts d'étanchéité étaient principalement localisés au niveau des doigts de centrage de la pièce dans le moule, ces doigts faisant saillie, par exemple du bobineau de la bobine, pour venir en contact avec les parois du moule.Until now, this overmolding has been carried out directly on the reel, possibly after application of a winding holding varnish. The disadvantage of this process lay in the fact that it is practically impossible to achieve a good seal between the part, in particular in its plastic parts, and the overmolding, infiltration of humidity which can consequently always occur at these interfaces. These leaks were mainly located at the centering fingers of the part in the mold, these fingers protruding, for example from the spool of the coil, to come into contact with the walls of the mold.
On a proposé dans le document GB-A-212258 un procédé selon le préambule de la revendication 1. Ce procédé ne résoud pas toutefois le problème des doigts de centrage.Document GB-A-212258 has proposed a method according to the preamble of claim 1. This method does not however solve the problem of the centering fingers.
US-A-4 983 669 divulgue un procédé d'étanchéification d'une pièce, dans lequel on réalise un surmoulage d'une résine vinylique thermodurcissable.US-A-4,983,669 discloses a method of sealing a part, in which an overmolding of a thermosetting vinyl resin is carried out.
La présente invention vise à pallier ces inconvénients en fournissant notamment un procédé permettant d'assurer une protection étanche à toute pièce, comprenant ou non un bobinage, en particulier des bobines d'induction, des capteurs ou des éléments de connectique.The present invention aims to overcome these drawbacks by providing in particular a method making it possible to ensure leaktight protection for any part, including or not a winding, in particular induction coils, sensors or connector elements.
A cet effet, la présente invention a pour objet un procédé d'étanchéification d'une pièce telle qu'une bobine d'induction selon la revendication 1.To this end, the present invention relates to a method of sealing a part such as an induction coil according to claim 1.
Dans ces conditions, la pièce finie est entièrement revêtue de la matière plastique du deuxième surmoulage, l'étanchéité étant ainsi pratiquement absolue, même dans le cas où des parties de la pièce d'origine restaient apparentes après le premier surmoulage.Under these conditions, the finished part is entirely coated with the plastic material of the second overmolding, the sealing being thus practically absolute, even in the case where parts of the original part remained visible after the first overmolding.
Dans le cas où des fils de connection sortent de la pièce finie, l'étanchéification au niveau de leur sortie est réalisée de manière connue à l'aide d'un presse-étoupe.In the case where connection wires exit from the finished part, the sealing at their exit is carried out in known manner using a cable gland.
Le deuxième surmoulage peut également avoir pour but de donner à la pièce finie l'aspect et les dimensions souhaités. On remarquera à ce sujet que l'invention est particulièrement bien adaptée à l'étanchéification de pièces dans lesquelles la distance des éléments internes aux faces de la pièce finie ne sont pas critiques aux quelques dixièmes de millimètres près de l'épaisseur de la couche de résine vinylique.The second overmolding can also have the aim of giving the finished part the desired appearance and dimensions. It will be noted in this regard that the invention is particularly well suited to sealing parts in which the distance of the internal elements to the faces of the finished part are not critical to a few tenths of a millimeter near the thickness of the layer of vinyl resin.
On décrira maintenant, à titre d'exemple non limitatif, des modes de réalisation particuliers de l'invention en référence aux dessins annexés dans lesquels :
- la figure 1 est une vue axiale d'une bobine revêtue d'une protection étanche selon l'invention, représentée schématiquement dans le moule du deuxième surmoulage et,
- la figure 2 est une vue partielle, en perspective et en coupe, d'une bobine réalisée conformément à la présente invention.
- FIG. 1 is an axial view of a coil coated with a waterproof protection according to the invention, shown diagrammatically in the mold of the second overmolding and,
- Figure 2 is a partial view, in perspective and in section, of a coil produced in accordance with the present invention.
La figure 1 représente une bobine comprenant un bobineau 1, réalisé en matière plastique, et sur lequel est enroulé un bobinage 2.FIG. 1 represents a coil comprising a coil 1, made of plastic, and on which a
La bobine ainsi réalisée, est trempée dans une résine vinylique thermodurcissable, telle par exemple que la résine commercialisée sous la marque Plastisol, par la Société PPG Industries (France) S.A.The coil thus produced is dipped in a thermosetting vinyl resin, such as for example the resin sold under the brand Plastisol, by the company PPG Industries (France) S.A.
A cet effet, la pièce est tout d'abord portée à une température comprise par exemple entre 140 et 160 degrés C. La résine dans laquelle la pièce est trempée est à une température comprise par exemple entre 28 et 30 degrés C, sa viscocité étant alors d'environ 35 poises.For this purpose, the part is first brought to a temperature of, for example, between 140 and 160 degrees C. The resin in which the part is soaked is at a temperature, for example, between 28 and 30 degrees C, its viscosity being then about 35 poises.
L'immersion et la sortie du bac de trempage s'effectue lentement avec si possible un ralentissement sur les parties horizontales.Immersion into and out of the soaking tank takes place slowly, with a slowdown if possible on the horizontal parts.
Le trempage proprement dit peut par exemple durer quelques secondes ou quelques dizaines de secondes, après quoi la pièce est retirée et égouttée, et de préférence préséchée avant cuisson, pendant quelques dizaines de minutes.The actual soaking may for example last a few seconds or a few tens of seconds, after which the part is removed and drained, and preferably pre-dried before cooking, for a few tens of minutes.
La pièce ainsi enduite de résine vinylique est alors soumise à une cuisson, pendant par exemple vingt minutes, à une température de l'ordre de 160 à 170 degrés C.The part thus coated with vinyl resin is then subjected to firing, for example for twenty minutes, at a temperature of the order of 160 to 170 degrees C.
Il en résulte que la pièce est revêtue d'une couche de résine durcie 3, d'épaisseur comprise par exemple entre 3 et 8/10ème de millimètres.As a result, the part is coated with a hardened
Dans le cas représenté au dessin, la bobine a été trempée verticalement en la saisissant par son extrémité 1′, jusqu'au niveau du plan P.In the case shown in the drawing, the coil has been quenched vertically by gripping it by its end 1 ′, up to the level of the plane P.
Les seuls défauts d'étanchéité ne peuvent donc se produire qu'au niveau de ce plan.The only leaks can therefore only occur at this plane.
On remarque par ailleurs que la face 4 du bobineau, qui n'a pas été immergée, reste fonctionnelle et adaptable. Ceci est particulièrement utile dans le cas de connections ou de la face active d'un capteur.We also note that the face 4 of the reel, which has not been submerged, remains functional and adaptable. This is particularly useful in the case of connections or the active face of a sensor.
La bobine revêtue de sa couche isolante 3 est ensuite placée dans un moule 5 pour y subir un deuxième surmoulage par toute matière plastique convenable. Ce surmoulage définitif permet au produit, déjà étanche, de résister aux diverses sollicitations chimiques et mécaniques, et de respecter les tolérances dimensionnelles exigées.The coil coated with its
On remarque sur la figure 1 que le moule 5 comporte des doigts 6, en saillie vers son intérieur, et en appui sur la couche 3, afin d'assurer le centrage de la pièce. Cet agencement suppose bien entendu que l'on admette des fluctuations de position de la bobine de quelques dixième de millimètres par rapport aux surfaces de la pièce définitive, du fait des variations d'épaisseur de la couche vinylique étanche 3.Note in Figure 1 that the mold 5 has fingers 6, projecting inwardly, and resting on the
La figure 2 représente une autre bobine 7, réalisée selon l'invention.FIG. 2 represents another
Cette bobine comprend, comme précédemment, un bobineau 1 sur lequel est enroulé un bobinage 2, l'ensemble étant revêtu de la couche vinylique étanche 3.This coil comprises, as before, a coil 1 on which a
Cette figure 2 montre également la couche de surmoulage définitif 8, réalisée dans un moule tel que le moule 5, et donnant à la pièce son aspect et ses cotes définitives.This FIG. 2 also shows the final overmolding layer 8, produced in a mold such as the mold 5, and giving the part its appearance and its final dimensions.
Claims (3)
- Method for sealing a workpiece (1) such as a induction coil, wherein two successive overmouldings of said workpiece (1) are provided, characterised by the fact that the first overmoulding (3) is made with a thermosetting vinyl resin only on a part of the workpiece (1) and that the second overmoulding is made in a mould (5), wherein said piece is held centered by means of fingers (6) belonging to the mould (5) pressing on the layer of the first overmoulding (3).
- Method according to claim 1, wherein said first overmoulding (3) is made by steeping.
- Method according to any claims 1 and 2, wherein said first overmoulding (3) is followed by a baking.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR919105120A FR2675943B1 (en) | 1991-04-25 | 1991-04-25 | PROCESS FOR SEALING A PART SUCH AS AN INDUCTION COIL AND MOLD FOR IMPLEMENTING THE PROCESS. |
| FR9105120 | 1991-04-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0511062A1 EP0511062A1 (en) | 1992-10-28 |
| EP0511062B1 true EP0511062B1 (en) | 1996-07-17 |
Family
ID=9412256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92401090A Expired - Lifetime EP0511062B1 (en) | 1991-04-25 | 1992-04-17 | Method for sealing a device such as an induction coil |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0511062B1 (en) |
| JP (1) | JPH05124114A (en) |
| AT (1) | ATE140558T1 (en) |
| DE (1) | DE69212208T2 (en) |
| FR (1) | FR2675943B1 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA737883A (en) * | 1966-07-05 | Chrysler Corporation | Coil coating method | |
| GB678936A (en) * | 1948-10-20 | 1952-09-10 | Westinghouse Electric Int Co | Improvements in or relating to the treating of electrical windings with insulating varnishes |
| US3352711A (en) * | 1959-12-01 | 1967-11-14 | Gen Electric | Method of making electrical coils |
| GB916100A (en) * | 1960-01-20 | 1963-01-16 | Ass Elect Ind | Improvements relating to insulating coatings on metals |
| DE1270884B (en) * | 1962-03-14 | 1968-06-20 | Bosch Gmbh Robert | Process for the production of an ignition coil for ignition systems of internal combustion engines over-molded with synthetic resin |
| US3504431A (en) * | 1966-09-27 | 1970-04-07 | Gen Electric | Method of manufacturing insulated electrical members |
| DE2345043A1 (en) * | 1973-09-06 | 1975-04-03 | Siemens Ag | PROCEDURE FOR INSULATING AND LOCKING COILS OF ELECTRIC EQUIPMENT |
| US4486641A (en) * | 1981-12-21 | 1984-12-04 | Ruffini Robert S | Inductor, coating and method |
| JPS6113611A (en) * | 1984-06-29 | 1986-01-21 | Mitsubishi Electric Corp | Manufacture of insulated coil |
| US4983669A (en) * | 1988-03-07 | 1991-01-08 | Aristech Chemical Corporation | Thermosetting composition from maleimide, olefinic monomer and unsaturated polyester |
-
1991
- 1991-04-25 FR FR919105120A patent/FR2675943B1/en not_active Expired - Fee Related
-
1992
- 1992-04-17 AT AT92401090T patent/ATE140558T1/en not_active IP Right Cessation
- 1992-04-17 DE DE69212208T patent/DE69212208T2/en not_active Expired - Fee Related
- 1992-04-17 EP EP92401090A patent/EP0511062B1/en not_active Expired - Lifetime
- 1992-04-24 JP JP4106997A patent/JPH05124114A/en active Pending
Non-Patent Citations (5)
| Title |
|---|
| DERW/WPI,Jap.Abs.78-59808A,7833 * |
| DERW/WPI,Jap.Abs.80-24601C,8014 * |
| DERW/WPI,Jap.Abs.82-04654E,8203 * |
| DERW/WPI,Jap.Abs.90-182614,9024 * |
| Pat.Abs.Jap.13,no.42.,30/01/89 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69212208D1 (en) | 1996-08-22 |
| JPH05124114A (en) | 1993-05-21 |
| EP0511062A1 (en) | 1992-10-28 |
| FR2675943B1 (en) | 1994-10-21 |
| FR2675943A1 (en) | 1992-10-30 |
| ATE140558T1 (en) | 1996-08-15 |
| DE69212208T2 (en) | 1997-02-20 |
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