Difference between revisions of "Manufacturing Technologies for Contact Parts"

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Besides the selection of the most suitable contact materials the design and type
+
Besides the selection of the most suitable contact materials, the design and type of attachment is critical for the reliability and electrical life of contact components for electromechanical switching devices. The most important factors here are the material-saving use of precious metals and the most economical manufacturing method for contact parts..
−
of attachment is critical for the reliability and electrical life of contact
 
−
components for electromechanical switching devices. The materials saving use
 
−
of high cost precious metals and the most economic manufacturing method for
 
−
contact parts are most important factors.
 
  
−
There are two basic manufacturing solutions available: One can start with single
+
There are two basic manufacturing solutions available: One can start with single contact parts, such as contact rivets or tips, which then are attached mechanically or by brazing or welding resp. to carrier parts. In the second case, a base material coated or clad with the precious contact metal - for special applications also clad with another non-precious material – in the form of strips or profiles is manufactured as a semi-finished pre-material from which the contact components are then stamped and formed. Besides mechanical cladding other processes such as electroplating and deposition from the gas phase are utilized.
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contact parts such as contact rivets or tips which then are attached
+
Which of the following manufacturing processes is finally chosen, depends on the final application of the contact components in their respective switching devices or electromechanical components. Other considerations, such as the required number of electrical operations, the most economical use of precious metals and the anticipated volumes of parts are also important for the process selection.
−
mechanically or by brazing or welding resp. to carrier parts. In the second case
 
−
a base material coated or clad with the precious contact metal - for special
 
−
applications also clad with another non-precious material – in the form of strips
 
−
or profiles is manufactured as a semi-finished pre-material from which the
 
−
contact components are then stamped and formed. Besides mechanical
 
−
cladding other processes such as electroplating and deposition from the gas
 
−
phase are utilized.
 
−
Which of the following manufacturing processes is finally chosen depends on
 
−
the final application of the contact components in their respective switching
 
−
devices or electromechanical components. Other considerations such as the
 
−
required number of electrical operations, the most economical use of precious
 
−
metals and the anticipated volumes of parts are also important for the process
 
−
selection.
 
  
−
===3.1 Manufacturing of Single Contact Parts===
+
==Manufacturing of Single Contact Parts==
−
The group of single contacts includes contact rivets, contact tips, and formed
+
The group of single contacts includes contact rivets, contact tips and formed parts such as weld buttons. Contact spheres (or balls) are today rarely used because of economical considerations. <br>
−
parts such as weld buttons. Contact spheres (or balls) are today rarely used
+
Main Articel: [[Manufacturing of Single Contact Parts| Manufacturing of Single Contact Parts]]
−
because of economical considerations. <br>
 
−
Main Articel: [[3.1 Manufacturing of Single Contact Parts| Manufacturing of Single Contact Parts]]
 
  
−
===3.2 Manufacturing of Semi-Finished Materials===
+
==Manufacturing of Semi-Finished Materials==
−
Semi-finished contact pre-materials can be manufactured from solid precious
+
Semi-finished contact pre-materials can be manufactured from solid precious metals, precious metal alloys or precious metal containing composite materials. <br>
−
metals, precious metal alloys, or precious metal containing composite materials. <br>
+
Main Articel: [[Manufacturing of Semi-Finished Materials | Manufacturing of Semi-Finished Materials]]
−
Main Articel: [[3.2 Manufacturing of Semi-Finished Materials | Manufacturing of Semi-Finished Materials]]
 
  
 +
==Attachment of Single Contact Parts==
 +
The following segments give an overview of the usually applied attachment technologies for contact parts to carrier components. They include mechanical, as well as brazing and welding methods used for electrical contact assemblies.
  
−
===3.3 Attachment of Single Contact Parts===
+
Main Articel: [[Attachment of Single Contact Parts | Attachment of Single Contact Parts]]
−
The following segments give an overview of the usually applied attachment
 
−
technologies for contact parts to carrier components. They include mechanical
 
−
as well as brazing and welding methods used for electrical contact assemblies.
 
  
−
Main Articel: [[3.3 Attachment of Single Contact Parts | Attachment of Single Contact Parts]]
+
== Evaluation of Braze or Weld Joints==
 +
The switching properties of brazed and welded contact assemblies is strongly dependent on the quality of the joint between the contact and the carrier. The required high quality is evaluated through optical methods, continuous control of relevant process parameters and by sampling of finished products.
  
 +
Main Articel: [[Evaluation of Braze or Weld Joints| Evaluation of Braze or Weld Joints]]
  
−
===3.4 Evaluation of Braze or Weld Joints===
+
==Stamped Contact Parts==
−
The switching properties of brazed and welded contact assemblies is strongly
+
Stamped electrical contact parts typically consist of a base carrier material to which a contact material is attached by various methods (<xr id="fig:Plated and contact containing pre-stamped strips and stamped parts"/><!--(Fig. 3.17)-->).
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dependent on the quality of the joint between the contact and the carrier. The
+
They serve as the important functional components in many switching and electromechanical devices for a broad range of electrical and electronic
−
required high quality is evaluated through optical methods, continuous control
+
applications. On the one hand, they perform the mostly loss-free electrical current transfer and the closing and opening of electrical circuits, while on the other hand, the contact carriers are important mechanical design components, selected to meet the requirements on electrical, thermal, mechanical and magnetic properties.
−
of relevant process parameters and by sampling of finished products.
 
  
−
Main Articel: [[3.4 Evaluation of Braze or Weld Joints| Evaluation of Braze or Weld Joints]]
+
The increasing miniaturization of electromechanical components requires ever smaller stamped parts with low dimensional tolerances. Such precision
 +
stamped parts are needed in the automotive technology for highly reliable switching and connector performance. In the information and data processing
 +
technology, they transfer signals and control impulses with high reliability and serve as the interface between electronic and electrical components.
 +
<figure id="fig:Plated and contact containing pre-stamped strips and stamped parts">
 +
[[File:Plated and contact containing pre-stamped strips and stamped parts.jpg|left|thumb|Figure 1: Plated and contact containing pre-stamped strips and stamped parts for different applications]]
 +
</figure>
 +
<br style="clear:both;"/>
 +
Main Articel: [[Stamped Contact Parts| Stamped Contact Parts]]
  
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===3.5 Stamped Contact Parts===
+
==References==
−
Stamped electrical contact parts typically consist of a base carrier material to
 
−
which a contact material is attached by various methods ''(Fig. 3.17)''. They serve
 
−
as the important functional components in many switching and
 
−
electromechanical devices for a broad range of electrical and electronic
 
−
applications. On the one hand they perform the mostly loss-free electrical
 
−
current transfer and the closing and opening of electrical circuits. In addition the
 
−
contact carriers are important mechanical design components selected to meet
 
−
the requirements on electrical, thermal, mechanical and magnetic properties.
 
−
 
 
−
The increasing miniaturization of electromechanical components requires ever
 
−
smaller stamped parts with low dimensional tolerances. Such precision
 
−
stamped parts are needed in the automotive technology for highly reliable
 
−
switching and connector performance. In the information and data processing
 
−
technology they transfer signals and control impulses with high reliability and
 
−
serve as the interface between electronic and electrical components.
 
−
 
 
−
Fig. 3.17:
 
−
Plated and contact
 
−
containing pre-stamped strips and
 
−
stamped parts for different
 
−
applications
 
−
 
 
−
===3.5.1 Types of Stamped Parts===
 
−
Stamped parts are produced as single pieces, in pre-stamped strip and comb
 
−
configurations. Depending on the requirements and application the contact and
 
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base material as well as the coating and attachment technology is carefully
 
−
selected.
 
−
 
 
−
*Coated stamped parts
 
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Stamped parts can be selectively or completely coated with precious metal
 
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containing materials based on gold, palladium, and silver as well as
 
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non-precious materials such as tin, nickel and copper ''(Fig. 3.17)''. For stamped
 
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parts in high volumes like those used as electrical components in automobiles
 
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the carrier material is mostly coated in a reel-to-reel process starting with either
 
−
solid or pre-stamped strips (see also chapter 7.1.1.3). Frequently the prestamped
 
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strip will be used directly in further automated assembly of the finished
 
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functional component. As an alternative finished stamped parts can be
 
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electroplated using barrel and rack plating methods.
 
−
 
 
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Very thin coating layers with tight tolerances are deposited by electroplating. For
 
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many applications the high mechanical wear resistance is advantageous. Since
 
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even very thin layers are mostly pore-free, these coatings also act as an
 
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effective corrosion inhibitor. The type of coatings, the sequence of multiple
 
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layers, and the coating thickness, for example for connectors, are chosen
 
−
according to the requirements for the end application.
 
−
 
 
−
*Clad stamped parts
 
−
 
 
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For many applications thicker precious metal surfaces or AlSi layers are
 
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necessary. These cannot be deposited by electroplating. Besides meltmetallurgically
 
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produced materials on the basis of gold, palladium and silver,
 
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also powder-metallurgical materials are required frequently. The metallurgical
 
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bond between these contact materials and the mostly copper based substrates
 
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is achieved through various mechanical cladding methods (see also chapter
 
−
3.2.1). In this way also aluminum clad strips are manufactured in which the
 
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aluminum layer serves as the bondable surface in the interface between
 
−
electromechanical connections and electronic circuits. These clad semifinished
 
−
materials can be further fabricated into pre-stamped strips, in comb
 
−
form, or single stamped parts ''(Fig. 3.18)''.
 
−
 
 
−
Fig. 3.18:
 
−
Examples of clad stamped parts
 
−
 
 
−
*Welded stamped parts
 
−
 
 
−
Welded stamped parts can be fabricated by various methods (see also Chapter
 
−
3.3.3). Single contact pieces can be attached to pre-stamped or finished
 
−
stamped strips as weld buttons and wire or profile segments by electrical
 
−
resistance welding. Contact parts can also be stamped from seam-welded
 
−
semi-finished strip. Fitting the end application contact materials based on gold,
 
−
palladium and silver. Depending on the contact material and the design of the
 
−
finished contact component the contact bottom surface may be consist of a
 
−
weldable backing material.
 
−
 
 
−
*Brazed stamped parts
 
−
 
 
−
Brazed stamped contact assemblies are manufactured by two joining methods
 
−
(see also chapter 3.3.2). The contact material is either attached by resistance
 
−
or induction brazing to base metal carriers as prefabricated contact tip or they
 
−
are stamped from brazed semi-finished toplay strip. It is typical for brazed
 
−
contact parts that the contact material consists of silver based contact material
 
−
and a good conducting copper base material with larger cross-sectional area
 
−
for the usually higher current carrying capacity.
 
−
 
 
−
*Stamped contact parts with rivets
 
−
 
 
−
Riveted stamped contact parts are manufactured with the use of contact rivets
 
−
which are transferred over suitable feed mechanisms correctly oriented into
 
−
holes punched into the carrier ''(Fig. 3.19)''. Frequently also wire or wire segments
 
−
resp. are used which are subsequently coined and formed into the desired
 
−
contact shape (see also chapter 3.3.1). Both attachment methods have their
 
−
distinct advantages. Using composite or tri-metal rivets allows limiting the use
 
−
of precious metal custom tailored to the volume needed for specific switching
 
−
requirements. For wire staking the precious metal usage is usually higher but
 
−
the staking can be performed at significantly higher production rates
 
−
and the additional rivet making step is eliminated.
 
−
 
 
−
Fig. 3.19:
 
−
Examples of riveted stamped parts
 
−
 
 
−
*Pre-mounted component stamped parts
 
−
 
 
−
Components stamped parts consist of a minimum of two carrier parts which
 
−
differ in their material composition and geometrical form and the contact
 
−
material
 
−
''(Fig. 3.21)''. The assembly of these components as single pieces or stamping
 
−
progressions is performed in a stamping die by riveting or coining. To increase
 
−
the current carrying capacity at the joining area an additional welding step can
 
−
be added. Depending on the requirements the different properties of the two
 
−
carrier components can be combined. As an example: the high electrical
 
−
conductivity of a contact carrier blade is joined with the thermal or mechanical
 
−
spring properties of a second material to form a functional component. For this
 
−
process both carrier base materials can also be coated with additional
 
−
layers of other functional materials.
 
−
 
 
−
Fig. 3.20:
 
−
Examples of pre-mounted stamped
 
−
component parts
 
−
 
 
−
Stamped parts which are insert molded into or combined with plastic parts are
 
−
used in electromechanical components (see Chapter 10).
 
−
 
 
−
===3.5.2 Stamping Tools===
 
−
For the design of stamping tools the latest CAD software systems are used.
 
−
Modern stamping tools usually employ a modular design with integrated
 
−
dimensional and functional controls ''(Fig. 3.21)''. Depending on the requirements
 
−
on the parts and the volumes they are built with steel or carbide (-steel) inserts
 
−
which are coated with a wear resistant material such as for example TiN for
 
−
longer life.
 
−
 
 
−
A special stamping process is precision stamping for contact parts made from
 
−
thin strip materials with thicknesses in the range of 0.05 – 2.5 mm. With high
 
−
capacity stamping technology up to 1400 strokes/min can be reached for high
 
−
volume parts. During the actual stamping operation frequently other processes
 
−
such as thread-forming, welding of contact segments and insertion and forming
 
−
of contacts from wire segments are integrated. Depending on the production
 
−
volumes these operations can also be performed in multiples.
 
−
 
 
−
The quality of the tools used for stamping, like progressive dies and stamp-forming
 
−
tools is important for the final precision and consistency of the parts. During high
 
−
speed stamping the tools are exposed to extreme mechanical stresses which must
 
−
be compensated for to ensure the highest precision over long production runs. With
 
−
such high quality progressive dies parts of high precision with a cutting width of less
 
−
than the material thickness and with strict quality requirements for the cutting surfaces
 
−
can be manufactured.
 
−
To ensure the highest demands on the surface quality of precision contact parts quite
 
−
often vanishing oils are used as tool lubricants. Cleaning and degreasing operations
 
−
can also be integrated into the stamping process. Additionally most stamping lines
 
−
are also equipped with test stations for a 100% dimensional and surface quality
 
−
control.
 
−
During the design of stamping tools for electrical contacts minimizing of process
 
−
scrap and the possibility to separate the precious metal containing scrap must be
 
−
considered.
 
−
 
 
−
Fig. 3.21:
 
−
Progressive die for stamped contact parts
 
−
[[Category:Manufacturing Technologies for Contact Parts|Category]]
 
−
 
 
−
===References===
 
  
 
Vinaricky, E. (Hrsg.): Elektrische Kontakte, Werkstoffe und Anwendungen.
 
Vinaricky, E. (Hrsg.): Elektrische Kontakte, Werkstoffe und Anwendungen.
Line 228: Line 56:
 
Jinduo, F; Guisheng, W.; Fushu, L.; Hongbing, Z.; Wenland, L.: Study on
 
Jinduo, F; Guisheng, W.; Fushu, L.; Hongbing, Z.; Wenland, L.: Study on
 
Reliability of AuAg10/AgNi10/CuNi30 Micro Contacts,
 
Reliability of AuAg10/AgNi10/CuNi30 Micro Contacts,
−
th Proc. 24 Int. Conf.on Electr. Contacts, Saint Malo, France 2008, 206-209
+
th Proc. 24<sup>th</sup> Int. Conf.on Electr. Contacts, Saint Malo, France 2008, 206-209
  
 
Dorn, L.: Grundlagen der Löttechnik. in: Hartlöten Grundlagen und
 
Dorn, L.: Grundlagen der Löttechnik. in: Hartlöten Grundlagen und
Line 251: Line 79:
 
Bolmerg, E.: Aufschweißtechnik von Kontakten in Hinblick auf ihre Anwendung.
 
Bolmerg, E.: Aufschweißtechnik von Kontakten in Hinblick auf ihre Anwendung.
 
VDE-Fachbericht 51 (1997) 103-109
 
VDE-Fachbericht 51 (1997) 103-109
 +
 +
[[de:Technologien_für_die_Herstellung_von_Kontaktteilen]]

Latest revision as of 10:18, 12 January 2023

Besides the selection of the most suitable contact materials, the design and type of attachment is critical for the reliability and electrical life of contact components for electromechanical switching devices. The most important factors here are the material-saving use of precious metals and the most economical manufacturing method for contact parts..

There are two basic manufacturing solutions available: One can start with single contact parts, such as contact rivets or tips, which then are attached mechanically or by brazing or welding resp. to carrier parts. In the second case, a base material coated or clad with the precious contact metal - for special applications also clad with another non-precious material – in the form of strips or profiles is manufactured as a semi-finished pre-material from which the contact components are then stamped and formed. Besides mechanical cladding other processes such as electroplating and deposition from the gas phase are utilized. Which of the following manufacturing processes is finally chosen, depends on the final application of the contact components in their respective switching devices or electromechanical components. Other considerations, such as the required number of electrical operations, the most economical use of precious metals and the anticipated volumes of parts are also important for the process selection.

Manufacturing of Single Contact Parts

The group of single contacts includes contact rivets, contact tips and formed parts such as weld buttons. Contact spheres (or balls) are today rarely used because of economical considerations.
Main Articel: Manufacturing of Single Contact Parts

Manufacturing of Semi-Finished Materials

Semi-finished contact pre-materials can be manufactured from solid precious metals, precious metal alloys or precious metal containing composite materials.
Main Articel: Manufacturing of Semi-Finished Materials

Attachment of Single Contact Parts

The following segments give an overview of the usually applied attachment technologies for contact parts to carrier components. They include mechanical, as well as brazing and welding methods used for electrical contact assemblies.

Main Articel: Attachment of Single Contact Parts

Evaluation of Braze or Weld Joints

The switching properties of brazed and welded contact assemblies is strongly dependent on the quality of the joint between the contact and the carrier. The required high quality is evaluated through optical methods, continuous control of relevant process parameters and by sampling of finished products.

Main Articel: Evaluation of Braze or Weld Joints

Stamped Contact Parts

Stamped electrical contact parts typically consist of a base carrier material to which a contact material is attached by various methods (Figure 1). They serve as the important functional components in many switching and electromechanical devices for a broad range of electrical and electronic applications. On the one hand, they perform the mostly loss-free electrical current transfer and the closing and opening of electrical circuits, while on the other hand, the contact carriers are important mechanical design components, selected to meet the requirements on electrical, thermal, mechanical and magnetic properties.

The increasing miniaturization of electromechanical components requires ever smaller stamped parts with low dimensional tolerances. Such precision stamped parts are needed in the automotive technology for highly reliable switching and connector performance. In the information and data processing technology, they transfer signals and control impulses with high reliability and serve as the interface between electronic and electrical components.

Figure 1: Plated and contact containing pre-stamped strips and stamped parts for different applications


Main Articel: Stamped Contact Parts

References

Vinaricky, E. (Hrsg.): Elektrische Kontakte, Werkstoffe und Anwendungen. Springer-Verlag, Heidelberg, Berlin 2002

Witter, G., J.; Horn, G.: Contact Design and Attachment in: Electrical Contacts. Hrg.: Slade, P., G., Marcel Dekker, Inc.,New York, Basel, 1999

Mürrle, U: Löten und Schweißen elektrischer Kontakte. In: Werkstoffe für elektrische Kontakte und ihre Anwendungen: Hrg.: Schröder K.-H. u. a.; Expert-Verlag, Band 366, (1997), 146 - 175

Eisentraut, H.: Verbundwerkstoffe aus der Walze. Kaltwalzplattieren von Mehrschichtverbundhalbzeugen, Metall 48 (1994) 95-99

Weik, G.: Kontaktprofile ganzheitliche Lösungen für elektrische Kontaktsysteme, Metall 61 (2007) H. 6, 399 403

Jinduo, F; Guisheng, W.; Fushu, L.; Hongbing, Z.; Wenland, L.: Study on Reliability of AuAg10/AgNi10/CuNi30 Micro Contacts, th Proc. 24th Int. Conf.on Electr. Contacts, Saint Malo, France 2008, 206-209

Dorn, L.: Grundlagen der Löttechnik. in: Hartlöten Grundlagen und Anwendungen. Hrsg.: Dorn, L. u.a., Expert-Verlag, Band 146 (1985) 15-40

Schreiner, H.: Güte der Lötung bzw. Schweißung von Kontaktstücken auf dem Trägermetall - Prüfung und Beurteilung nach dem Beschalten im Prüfschalter. Metall 30 (1976) 625 - 628

DVS-Merkblatt 2813: Widerstandsschweißen von elektrischen Kontakten, Düsseldorf: DVS-Verlag 2009

Schneider, F.: Stöckel, D.: Schweißen in der Kontakttechnik. Zts. für wirtschaftliche Fertigung 72, (1977) H. 4 u. 6

Haas, H.; Martin, W.; Tschirner, U.: Widerstandsschweißen in der Elektrotechnik, VDE-Fachbericht 42 (1991) 113-121

Weik, G.: Widerstandsschweißen von Kontaktprofilen mit Nachsetzwegmessung, VDE-Fachbericht 63 (2007) 165-174

Bolmerg, E.: Aufschweißtechnik von Kontakten in Hinblick auf ihre Anwendung. VDE-Fachbericht 51 (1997) 103-109

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