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Stamped Contact Parts

No change in size, 15:49, 22 January 2014
Types of Stamped Parts
*Welded stamped parts
Welded stamped parts can be fabricated by various methods (see also Chapter3.3.3). Single contact pieces can be attached to pre-stamped or finishedstamped strips as weld buttons and wire or profile segments by electricalresistance welding. Contact parts can also be stamped from seam-weldedsemi-finished strip. Fitting the end application contact materials based on gold,palladium and silver. Depending on the contact material and the design of thefinished contact component the contact bottom surface may be consist of aweldable 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 resistanceor induction brazing to base metal carriers as prefabricated contact tip or theyare stamped from brazed semi-finished toplay strip. It is typical for brazedcontact parts that the contact material consists of silver based contact materialand a good conducting copper base material with larger cross-sectional areafor the usually higher current carrying capacity.
*Stamped contact parts with rivets
Riveted stamped contact parts are manufactured with the use of contact rivetswhich are transferred over suitable feed mechanisms correctly oriented intoholes punched into the carrier ''(Fig. 3.19)''. Frequently also wire or wire segmentsresp. are used which are subsequently coined and formed into the desiredcontact shape (see also chapter 3.3.1). Both attachment methods have theirdistinct advantages. Using composite or tri-metal rivets allows limiting the useof precious metal custom tailored to the volume needed for specific switchingrequirements. For wire staking the precious metal usage is usually higher butthe staking can be performed at significantly higher production ratesand the additional rivet making step is eliminated.
[[File:Examples of riveted stamped parts.jpg|right|thumb|Examples of riveted stamped parts]]
*Pre-mounted component stamped parts
Components stamped parts consist of a minimum of two carrier parts whichdiffer in their material composition and geometrical form and the contactmaterial''(Fig. 3.21)''. The assembly of these components as single pieces or stampingprogressions is performed in a stamping die by riveting or coining. To increasethe current carrying capacity at the joining area an additional welding step canbe added. Depending on the requirements the different properties of the twocarrier components can be combined. As an example: the high electricalconductivity of a contact carrier blade is joined with the thermal or mechanicalspring properties of a second material to form a functional component. For thisprocess both carrier base materials can also be coated with additionallayers of other functional materials.
Fig. 3.20:
component parts
Stamped parts which are insert molded into or combined with plastic parts areused in electromechanical components (see Chapter 10).
=== Stamping Tools===

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