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EP0392398B1 - Méthode pour produire et envelopper des minifusibles et microfusibles - Google Patents

Méthode pour produire et envelopper des minifusibles et microfusibles Download PDF

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Publication number
EP0392398B1
EP0392398B1 EP90106691A EP90106691A EP0392398B1 EP 0392398 B1 EP0392398 B1 EP 0392398B1 EP 90106691 A EP90106691 A EP 90106691A EP 90106691 A EP90106691 A EP 90106691A EP 0392398 B1 EP0392398 B1 EP 0392398B1
Authority
EP
European Patent Office
Prior art keywords
casing parts
casing
parts
housing
area
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
EP90106691A
Other languages
German (de)
English (en)
Other versions
EP0392398A3 (fr
EP0392398A2 (fr
Inventor
Detlef Plegge
Nikolaus Träger
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.)
Wickmann Werke GmbH
Original Assignee
Wickmann Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wickmann Werke GmbH filed Critical Wickmann Werke GmbH
Priority to AT90106691T priority Critical patent/ATE87394T1/de
Publication of EP0392398A2 publication Critical patent/EP0392398A2/fr
Publication of EP0392398A3 publication Critical patent/EP0392398A3/fr
Application granted granted Critical
Publication of EP0392398B1 publication Critical patent/EP0392398B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/02—Manufacture of fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0013—Means for preventing damage, e.g. by ambient influences to the fuse
    • H01H85/0021—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices
    • H01H2085/0034—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices with molded casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0013—Means for preventing damage, e.g. by ambient influences to the fuse
    • H01H85/0021—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices
    • H01H85/003—Means for preventing damage, e.g. by ambient influences to the fuse water or dustproof devices casings for the fusible element

Definitions

  • the invention relates to a method for producing and closing small and miniature fuses, the housing of which is formed from two parts, encloses a cavity with a fusible conductor arranged therein and is provided with at least two connections for electrical connection, with the method steps of provisionally joining the housing parts and overmolding the housing with a plastic.
  • Such a method for producing fuses, in particular NH fuses, with a synthetic resin coating is known from DE-A-1 463 530.
  • the connections in the form of contact blades and the fusible link connecting the contact blades are fixed in their mutual position by an auxiliary body of thin wall thickness made of insulating material, which can be attached to the contact blade with elastic deformation, and then sealed with a jacket made of synthetic resin by overmolding, overmolding or casting or the like.
  • the cuboid or cylindrical housing consists of two essentially symmetrical halves which are brought into engagement with one another and with the contact blades of the fuse.
  • the auxiliary body is made of the same plastic as the sheathing, there is an intimate connection between the outer sheath and the auxiliary body in the production of the synthetic resin sheathing.
  • the cavity of the fuse is filled with quenching sand that surrounds the fuse element all around.
  • the two housing halves can be manufactured in large quantities on plastic injection molding machines with little effort.
  • the manufacture of the contact knife and the fuse element can also be easily automated.
  • the method of assembling the contact blades and the fusible link connecting the contact blades in one of the housing parts necessitates one-off production, since the outlay for automated mass production, as is required for small and very small fuses, is too high.
  • the auxiliary body formed from the two joined housing parts, from which the contact knives protrude as connections on different sides of the housing, is completely encased in synthetic resin, including the areas of the contact knives close to the housing, so that a cartridge body which is sealed around and firmly held together is produced.
  • the known method for the production of small and micro fuses is also not to be used because the fusible link bridging the contact blades in the cavity of the fuse is easily torn off due to careless handling and assembly.
  • a method for producing a two-part housing made of plastic is already known, according to which the housing is encapsulated with a ring made of thermoplastic plastic, especially in the area of the parting line, while the two housing halves are pressed together under pressure .
  • this method is not used to manufacture and close fuses, in particular small and micro fuses, but to encapsulate sensitive electrical components, in particular capacitors, when these have to be used under unfavorable conditions and therefore need to be protected.
  • This method is therefore about encapsulating or encapsulating a finished electrical component in a hermetically sealed protective container, the electrical connections of the electrical component in question being led to the outside in the parting line of the housing through the thermoplastic encapsulation.
  • a small or micro fuse as a chamber fuse in sandwich construction is produced from two housing halves with a flat sheet metal stamping strip carrying the fusible conductor between the two housing halves, as already mentioned, in a manner suitable for mass production by means of housing part strips for the lower and upper housing parts and with a strip-shaped stamped part for the connections.
  • the housing parts Before overmolding, the housing parts have to be connected to one another in a relatively complex manner, so that there are no larger passages or the like through which the molding compound can penetrate into the interior of fuses. There, it would very easily result in the destruction of the fuse wire, which is often only a few meters thick, and fill in the cavity required for the characteristic of a fuse.
  • the housing parts are therefore welded together, glued or locked together. In any case, the fastening is generally so solid that it would also be sufficient in itself to ensure the safety of the fuse and to offer an appealing lifespan.
  • there is a double effort in overmolding as far as the quality of the assembly is concerned.
  • the invention proposes that a strip of housing parts made of plastic for the lower housing parts and a strip of housing parts also made of plastic for the upper housing parts with a strip-shaped stamped part placed between the two housing part strips, in which the connections form a closed one Component are connected and the fusible link bridges the free ends of the connections, positioned with means such as pin and hole pairs to each other and temporarily connected to one another, and that the housing parts with the help of pressure plates or pins or molded surfaces during overmoulding using the pressure plates or pins or the molding surfaces are pressed together as a shaped element and / or modeling the molding compound.
  • housing part strips for the lower housing parts as well as for the upper housing parts are thus first produced in a plastic injection molding process in a suitable manner for mass production, whereby, as is also shown in an exemplary embodiment, the housing parts lying one behind the other in the housing part strip are each connected by webs are connected.
  • the connections are produced as components of a strip-shaped stamped part, so that they lie in a predetermined position relative to one another and are bridged by the fusible conductor, which is connected to the connections by soldering, bonding or the like.
  • the sensitive fuse element is not subjected to any further mechanical stress after attachment to the connections, because the position of the connections in the strip-shaped stamped part does not change until the fuse is finally manufactured.
  • a precise positioning of the three strip-shaped parts i.e. the two housing part strips and the strip-shaped stamped part inserted between the two housing part strips, is brought about and secured by means such as pin and hole pairs during the preliminary connection of the three parts, as will be explained in more detail below.
  • the housing parts are not left to their own devices immediately before the encapsulation and are therefore dependent on a correspondingly solid design, but rather the housing parts are pressed against one another with sufficient pretension so that a controlled hold is present. It is therefore sufficient if the housing parts are loosely plugged together with the aid of means to be explained or are otherwise precisely aligned with one another.
  • the pressure exerted by the pressure plates or pins or the shaped surfaces ensures that the housing parts abut each other so that gas tightness is usually present at this stage immediately before the encapsulation.
  • the housing parts are made almost without exception as plastic parts, the elasticity of which ensures that the desired tightness is present even with unfavorable manufacturing tolerances.
  • the pressure plates or pins or the molding surfaces are therefore part of the molding chamber, within which the molding compound spreads during the encapsulation. You thus influence the shape of the extrusion coating, of course by leaving channels or the like
  • Ribs or other, later projecting designs can be created.
  • the pressure plates or molding surfaces can themselves be modeled on the shape of the component or can bring about a change in shape overall, for example producing a cylindrical shape if the original shape of the housing which has not yet been overmolded is a cuboid.
  • pressure pins When pressure pins are used, they later form depressions in the spray skin on the molded housing, which do not cause any further problems. It is only important that the housing parts are pressed together by the pressure or molded parts and so there are areas where there is a system for passing on the contact pressure.
  • an overmolding of the parting joint takes place with a more or less strong overlap, which can be particularly supported by designing the housing parts in the region of the parting joint in such a way that the parting joint has the greatest extent and the adjacent areas are continuous or in jumps have a smaller scope. Since two housing halves are used, it is particularly expedient to design the outer contour conically or be beveled in a cuboid, so that, in addition to the shape interlocking in the micro range, the extrusion coating also provides a visible and effective conventional form fit.
  • connections When manufacturing miniature fuses and miniature fuses, it is common for the connections to be molded to be connected to each other to form a self-contained stamped part so that the previously applied sensitive fuse elements at the later connection ends inside the housing are not damaged. If such stamped parts are used, it is particularly clever to place apertured sections of the stamped part, which do not necessarily have the function of connections later, between the web halves, the respective pins for the loose pre-connection passing through a corresponding opening in the section . In this way, a manageable unit is created from the lower housing parts, the stamped part including the connections and the fusible conductors and upper housing parts, which are applied by bonding, for example, and which are plugged together to form a loose connection.
  • the encapsulation takes place in the area of the parting line, which can also capture large parts of the housing. Deviating from this, the bars can also be pressed in before spraying. Condition are separated so that the entire joint is overmolded during the subsequent molding. After the encapsulation, the webs are separated, the connections are cut free from the stamped part and, if necessary, bent under the component to form a so-called SMD fuse.
  • the housing parts can be made of different materials.
  • the material of the molding compound only has to harmonize with the material of the housing, otherwise it can be chosen freely.
  • the encapsulation can also take place at a temperature which can lead to melting of the then thermoplastic material of the housing. In this way, not only does a microscopic and macroscopic form fit occur, but the molding compound even sticks to the component, which further improves the cohesion of the housing.
  • the security blank shown in FIG. 1 consists of a housing 2, which is formed from two identical housing halves 3 and 4. Through cutouts 18 (FIG. 3) in the housing halves 3 and 4, connections 5 and 6 made of copper protrude into the interior of the housing 2, to which a fuse element 7 is fastened, for example by bonding.
  • the prefabrication stage consisting of these parts is clamped between the pressure plates 12 (FIG. 2) for the encapsulation, the injection mold forming the encapsulation 8, of course, also being wrapped around this prefabricated securing blank 1. The details of the form are not shown.
  • the extrusion coating 8 which can be seen in FIG. 1, is formed, which essentially only covers the flanks of the housing halves 3 and 4 while simultaneously enclosing the connections 5 and 6.
  • the pressure plates 12 press the housing halves 3 and 4 firmly against one another, which, moreover, are pre-positioned relative to one another by means to be explained.
  • the slight inclination of the side walls of the housing halves has two advantages: On the one hand, the incline counteracts the injection forces, which can be considerable. On the other hand, this creates a macroscopic form fit because the parting line between the two housing halves 3 and 4 is the location of the largest circumference and all neighboring areas are smaller in circumference.
  • the encapsulation 8 sits like a clamp on the two housing halves 3 and 4 and holds them together under the same pretension that was originally given up by the pressure plates 12.
  • FIG. 2 shows the side view of a finished fuse 10.
  • SMD surface Mounted Device
  • the wave soldering process requires the components to be glued to the circuit board.
  • a rib 13 can optionally be formed between the ends of the connections 5 and 6, which arises during the encapsulation, by a corresponding shaping of the pressure plate 12 lying on this side, which is indicated schematically in FIG. If it is already clear beforehand that the fuse 10 is fixed exclusively in the reflow process, such a rib 13 is not required.
  • the assigned plate 12 is then designed as well the pressure plate 12 shown in the upper half of the picture, namely with a continuous, flat bottom.
  • the protrusion of the web 11 from the extrusion coating 8 is harmless because the separated point lies directly next to the actual housing halves 3 and 4, which are pressed against one another with considerable pretension as a result of the pressure plates 12, and are further exposed to this prestressing pressure even after the encapsulation.
  • housing half strips 15 are mass-produced on automatic sprayers from a plastic. Each strip 15 contains five housing halves 3 or 4, three pins 16 and three holes 17. After selecting two strips, one is used to form the lower housing halves 3 and the other strip 15 to form the upper housing halves 4.
  • Each strip 15 carries cutouts 18 for receiving the connections 5 and 6 in the area of the housing halves, and a recess 19 is also formed in the area of each pin 16 or each hole 17, which serves to receive a section 21 which is part of a stamped part 20 for Formation of connections 5 and 6 are.
  • the stamped part 20 is shown in its entirety in the lower part of FIG. 3.
  • the layer structure thus formed is placed in the mold for extrusion coating, the loose cohesion which is formed by the pins 16 and the holes 17 being sufficient.
  • pressure plates 12 rest against the respective housing halves 3 and 4, and the rest of the mold is also closed. After the encapsulation, the layer structure mentioned can be removed, the cohesion now being final.
  • Openings 24 are provided in the area of the connections 5 and 6, which are in the area of the encapsulation 8 and improve the anchoring of the connections 5 and 6, which will be bent later. In this way it is reliably prevented that the connections 5 or 6 are pulled out of the closed housing during bending.
  • the unit is then divided along the cutting lines 25 or along the cutting lines 26 and 27 into individual securing blanks, preferably initially with cuts be placed along the cutting lines 26 and 27.
  • a very easy-to-use unit of a total of five fuse blanks is retained, which in this form can easily be brought into the shape shown in FIG. 2 by bending the connections 5 and 6. Only then are the cuts made along lines 25, as a result of which the strip-shaped unit breaks down into individual fuses 10.
  • FIG. 1 The representation given in the figures is greatly exaggerated. Even Figure 3 shows the actual backups in double size.
  • the invention is by no means limited to miniature fuses, but can be used with good success on small fuses and even larger units, since the cohesion of the housing parts is excellent, that is, the switching capacity of a corresponding fuse is considerable with the smallest external dimensions.
  • the units in the form presented can be tinned in a galvanic bath, with of course only the connections 5 and 6 being given a tin coating.
  • This late tinning in the galvanic bath is completely harmless for the unit.
  • the cut surfaces also have a tin layer, which often facilitates the flow of solder.
  • a tinplate strip tinned from the outset can be used, which, however, then has no tinning on the cut surfaces.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuses (AREA)

Claims (13)

  1. Méthode pour produire et envelopper des minifusibles et microfusibles
       dont le boîtier (2) est formé par deux parties (3, 4), entoure un espace creux avec un fusible (7) qui est placé à l'intérieur et qui est pourvu d'au moins deux raccords (5, 6) pour la connexion électrique
       avec les étapes de procédé de l'assemblage provisoire des pièces du boîtier et de l'injection du boîtier avec une matière plastique,
       caractérisée
       par la caractéristique selon laquelle une bande de partie de boîtier (15) fabriquée avec de la matière plastique pour les pièces inférieures du boîtier (3) et une bande de partie de boîtier (15) pour les parties supérieures du boîtier (4) également fabriquée avec de la matière plastique
       sont positionnées l'une par rapport à l'autre avec des organes comme des paires de chevilles et de trous (16, 17) et sont reliées l'une à l'autre provisoirement pour former une unité
       avec une pièce découpée en forme de bande (20), posée entre les deux bandes de partie de boîtier (15), dans laquelle les raccords (5, 6) sont reliés pour former un composant fermé en soi et le fusible (7) surmonte respectivement les extrémités libres des raccords (5, 6) et
       par la caractéristique de l'assemblage par pression des parties de boîtier (3, 4) à l'aide de plaques de pression (12) ou de chevilles de pression ou de surfaces moulées pendant l'injection en utilisant les plaques de pression (12) ou les chevilles de pression ou les surfaces moulées comme élément moulé pour délimiter et/ou modeler la matière à couler par injection.
  2. Méthode selon la revendication 1, caractérisée en ce que les parties de boîtier (3, 4) sont configurées dans la zone du joint partiel de telle manière que le joint partiel a le plus grand périmètre et que les zones voisines ont de manière continue ou discontinue un périmètre plus petit.
  3. Méthode selon la revendication 1 ou 2, caractérisée en ce que les raccords (5, 6) sont posés dans la zone de l'injection (8).
  4. Méthode selon la revendication 3. caractérisée en ce que les raccords (5, 6) sont posés dans la zone du joint partiel entre les parties du boîtier (3, 4).
  5. Méthode selon la revendication 4, caractérisée en ce que la zone respectivement injectée de chaque raccord (5, 6) est pourvue d'un orifice (24) contenant de la masse à injecter pour améliorer l'ancrage.
  6. Méthode selon l'une des revendications précédentes, caractérisée en ce que les chevilles (16) moulées sur les parties de boîtier pour l'assemblage provisoire des parties de boîtier (3. 4) sont enfoncées dans des trous ou forures encastrées dans les parties de boîtier (3, 4).
  7. Méthode selon l'une des revendications précédentes, caractérisée en ce que plusieurs parties de boîtier (3, 4) sont reliées l'une à l'autre par des moitiés de nervure (11) qui sont séparées avant ou après l'injection.
  8. Méthode selon les revendications 6 et 7, caractérisée en ce que les chevilles (16) sont posées dans la zone des nervures (11).
  9. Méthode selon la revendication 8, caractérisée en ce que des portions (21) de la pièce découpée (20), pourvues d'orifices (22), sont posées entre les moitiés de nervures (11) dont la broche respective (16) traverse un orifice correspondant (22) dans la portion (21).
  10. Méthode selon l'une des revendications précédentes, caractérisée en ce que deux moitiés de boîtier sont choisies comme parties de boîtier (3, 4).
  11. Méthode selon l'une des revendications précédentes, caractérisée en ce que les parties de boîtier (3, 4) sont formées en différentes matières.
  12. Méthode selon l'une des revendications précédentes, caractérisée en ce que les parties de boîtier (3, 4) sont constituées par une matière plastique thermoplastique et que la masse à injecter est injectée à une température à laquelle les parties de boîtier (3, 4) commencent à fondre.
  13. Méthode selon l'une des revendications précédentes à l'exception de la revendication 10, caractérisée en ce que des composants dissemblables sont choisis comme parties de boîtier (3, 4).
EP90106691A 1989-04-13 1990-04-06 Méthode pour produire et envelopper des minifusibles et microfusibles Expired - Lifetime EP0392398B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90106691T ATE87394T1 (de) 1989-04-13 1990-04-06 Verfahren zum herstellen und verschliessen von klein- und kleinstsicherungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912063 1989-04-13
DE3912063A DE3912063A1 (de) 1989-04-13 1989-04-13 Verfahren zum verschliessen eines elektrischen bauteils

Publications (3)

Publication Number Publication Date
EP0392398A2 EP0392398A2 (fr) 1990-10-17
EP0392398A3 EP0392398A3 (fr) 1992-03-04
EP0392398B1 true EP0392398B1 (fr) 1993-03-24

Family

ID=6378547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90106691A Expired - Lifetime EP0392398B1 (fr) 1989-04-13 1990-04-06 Méthode pour produire et envelopper des minifusibles et microfusibles

Country Status (4)

Country Link
EP (1) EP0392398B1 (fr)
JP (1) JP2869811B2 (fr)
AT (1) ATE87394T1 (fr)
DE (2) DE3912063A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2706625B2 (ja) * 1994-10-03 1998-01-28 エス・オー・シー株式会社 超小型チップヒューズ
DE102005027681A1 (de) * 2005-06-15 2006-12-28 Autecto Industrievertretungen Gmbh Schmelzsicherung und Verfahren zu deren Herstellung
CN101599393B (zh) * 2009-07-03 2011-06-01 杨光 一种微型保险丝的制作方法及其制成品
CN119233612B (zh) * 2024-12-02 2025-02-25 宁波峰梅新能源汽车科技股份有限公司 一种高压控制盒

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194931A (en) * 1961-05-10 1965-07-13 American Radiator & Standard Improved block-electrical brush assembly
DE1463530A1 (de) * 1963-06-29 1969-03-06 Siemens Ag Verfahren zur Herstellung von Schmelzsicherungen,insbesondere NH-Sicherungen,mit Kunstharzummantelung
FR2358253A1 (fr) * 1976-07-13 1978-02-10 Caillot Raymond Procede d'assemblage etanche par surmoulage de deux elements en matiere plastique
EP0157938A3 (fr) * 1984-03-23 1987-05-13 Siemens Aktiengesellschaft Boítier pour composants électriques

Also Published As

Publication number Publication date
ATE87394T1 (de) 1993-04-15
JP2869811B2 (ja) 1999-03-10
JPH02299118A (ja) 1990-12-11
DE59001060D1 (de) 1993-04-29
EP0392398A3 (fr) 1992-03-04
DE3912063A1 (de) 1990-10-18
EP0392398A2 (fr) 1990-10-17

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