EP0286022A1 - Elément en forme de bobine et procédé pour sa fabrication - Google Patents

Elément en forme de bobine et procédé pour sa fabrication Download PDF

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Publication number
EP0286022A1
EP0286022A1 EP88105255A EP88105255A EP0286022A1 EP 0286022 A1 EP0286022 A1 EP 0286022A1 EP 88105255 A EP88105255 A EP 88105255A EP 88105255 A EP88105255 A EP 88105255A EP 0286022 A1 EP0286022 A1 EP 0286022A1
Authority
EP
European Patent Office
Prior art keywords
solder pins
pins
solder
injected
injection
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
EP88105255A
Other languages
German (de)
English (en)
Other versions
EP0286022B1 (fr
Inventor
Eberhard Dipl.-Ing. Lehmann
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.)
Hohenloher Spulenkoerperfabrik GmbH and Co
Original Assignee
Hohenloher Spulenkoerperfabrik GmbH and Co
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 Hohenloher Spulenkoerperfabrik GmbH and Co filed Critical Hohenloher Spulenkoerperfabrik GmbH and Co
Publication of EP0286022A1 publication Critical patent/EP0286022A1/fr
Application granted granted Critical
Publication of EP0286022B1 publication Critical patent/EP0286022B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • 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
    • H01F41/10—Connecting leads to windings

Definitions

  • the invention relates to a process for the production of injection-molded plastic bobbins with solder pins, in which the solder pins are inserted into the injection mold and then injected into the material of the coil former.
  • the invention further relates to a coil former produced by such a method.
  • solder pins It has been known for many years to produce such bobbins in a rational manner by inserting the soldering pins into the injection mold and overmolding with the material of the bobbin so that they are already firmly anchored in the bobbin by the spraying process.
  • the solder pins usually have a thickened head which improves the anchoring of the solder pin in the coil former against axial pull-out forces.
  • solder pins are usually made of copper, bronze, brass, nickel silver or similar metals. Such solder pins are not readily solderable. Therefore, galvanized or hot-dip tinned soldering pins are used in known technology, which are delivered with the tinned surface and in the injection mold are introduced. The same applies in the event that the solder pins are fed from a wire roll into the injection mold and cut off there. The corresponding wires also have tin-plated surfaces.
  • Coil formers that have to meet higher requirements with regard to the solderability of their soldering pins must therefore either be manufactured with particular care or subjected to thorough testing and sorting with a high rejection rate.
  • the invention is based on the object of specifying a method with which coil formers with injected solder pins can be manufactured in such a way that the solder pins have a high level of solderability which also meets high requirements.
  • solder pins without a surface coating are inserted into the injection mold and then injected into the material of the coil former, and that the solder pins are then immersed in a flux and then provided with a metal coating.
  • the metal coating is by one dip into a lead-tin bath.
  • the above-mentioned object is also achieved with a coil body made of injection-molded plastic with solder pins with a tinned surface injected into a terminal block if the solder sticks have a non-surface-treated section which projects into the plastic body and, moreover, a hot-dip tinned surface.
  • the coil formers are manufactured in a departure from the process that has been common for decades, namely with solder pins that have not been surface-treated. It has been shown that a completely flawless surface of the untreated solder pins can be produced if they are immersed in a flux and then provided with the metal coating, preferably by immersion in a lead-zinc bath. Compared to other conceivable methods of applying the metal coating to the injected soldering pins, immersion in the lead-zinc bath has the advantage that the coil body can be kept free of the metallic coating in a defined manner without special measures being required for this.
  • solder pins therefore do not have a surface coating, insofar as they are surrounded by the plastic body, but only receive this on the part protruding from the plastic body. Since the preferably hot-dip galvanized surface is produced according to the invention in a last manufacturing step, it is not subject to any subsequent mechanical loads and can therefore reach the user completely intact, so that it also meets the highest requirements for solderability.
  • pre-cut solder pins are inserted into the injection mold or the solder pins are fed from a wire roll and only when, before or after the injection is closed be cut shape.
  • the drawing shows a simple exemplary embodiment of a coil former according to the invention, the left side of the symmetrical coil former being shown in a view and the right side in a section.
  • the coil former has flanges 2 on both sides of a winding space 1.
  • a terminal block 3 into which solder pins 4 are injected.
  • the solder pins 4 have a thickened head 5, which makes it difficult to pull the solder pins 4 out of the terminal block 3.
  • solder pins are bare within the terminal block 3, i.e. executed without a surface.
  • the parts of the soldering pins 4 protruding from the coil body, on the other hand, are provided with a subsequently applied surface layer 6, which is produced, for example, by immersing them in a lead-tin bath (lead: tin 40:60 proportions).
  • the immersion depth can be set very precisely, so that the solder pin 4 can be provided with the surface layer 6 practically over the entire length protruding from the terminal block 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Molten Solder (AREA)
EP88105255A 1987-03-31 1988-03-31 Elément en forme de bobine et procédé pour sa fabrication Expired - Lifetime EP0286022B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873710783 DE3710783A1 (de) 1987-03-31 1987-03-31 Spulenkoerper und verfahren zu ihrer herstellung
DE3710783 1987-03-31

Publications (2)

Publication Number Publication Date
EP0286022A1 true EP0286022A1 (fr) 1988-10-12
EP0286022B1 EP0286022B1 (fr) 1992-08-26

Family

ID=6324523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105255A Expired - Lifetime EP0286022B1 (fr) 1987-03-31 1988-03-31 Elément en forme de bobine et procédé pour sa fabrication

Country Status (2)

Country Link
EP (1) EP0286022B1 (fr)
DE (2) DE3710783A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19913708A1 (de) * 1999-03-26 2000-09-28 Hohenloher Kunststofftechnik G Verfahren zur Herstellung eines zur Verankerung in einem Spulenkörper vorgesehenen Lötstiftes
DE10148133A1 (de) 2001-09-28 2003-04-24 Ascom Energy Systems Ag Bern Flachtransformator mit gesteckten Sekundärwicklungen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2448296A1 (de) * 1974-10-10 1976-04-22 Draloric Electronic Anschlusselement fuer elektronische bauelemente
DE3341304A1 (de) * 1983-11-15 1985-05-23 Hohenloher Spulenkörperfabrik, 7110 Öhringen Elektrisches bauteil aus kunststoff und verfahren zu seiner herstellung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1763096U (de) * 1958-01-29 1958-03-13 Max Grundig Flanschspule koerper fuer spulen, spulenkombinationen, transformatoren od. dgl.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2448296A1 (de) * 1974-10-10 1976-04-22 Draloric Electronic Anschlusselement fuer elektronische bauelemente
DE3341304A1 (de) * 1983-11-15 1985-05-23 Hohenloher Spulenkörperfabrik, 7110 Öhringen Elektrisches bauteil aus kunststoff und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
DE3710783A1 (de) 1988-10-20
EP0286022B1 (fr) 1992-08-26
DE3873956D1 (de) 1992-10-01

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