2,808
edits
Changes
→Contact Rivets
because of economical considerations.
===Contact Rivets===
====Solid Contact Rivets====
Solid contact rivets are the oldest utilized contact parts. Their manufacturing
<table border="1" cellspacing="0" style="border-collapse:collapse"><tr><td><p class="s13">Characteristics</p></td><td><p class="s13">Form A Form B Form C</p><p class="s13">Rounded headf Trapeziodal Trapeziodal head, radiused head,flat</p></td><td><p class="s13">Suggested test equipment</p></td></tr><tr><td><p class="s13">a) Head diameter d<sub>1</sub> [mm]</p></td><td><p class="s13">d<span class="s14"><sub>1</sub></span><u><</u> 4 + 0,06 During optical measurement</p><p class="s13">d<span class="s14"><sub>1</sub></span>> 4 - 0,06 disregard corner</p><p class="s13">radius R<span class="s14"><sub>3</sub></span></p></td><td><p class="s13">Comparator,</p><p class="s13">Measuring microscope</p></td></tr><tr><td><p class="s13">b) Head thickness</p><p class="s13">k [mm]</p></td><td><p class="s13">d<span class="s14"><sub>1</sub></span><u><</u> 4 + 0,03</p><p class="s13">d<span class="s14"><sub>1</sub></span>> 4 + 0,08</p></td><td><p class="s13">Micrometer, Dial indicator</p></td></tr><tr><td><p class="s13">c) Shank diameter d<span class="s14"><sub>2</sub></span> [mm]</p></td><td><p class="s13">d<span class="s14"><sub>2</sub></span><u><</u> 2 - 0,06</p><p class="s13">d<span class="s14"><sub>2</sub></span>> 2 - 0,08</p></td><td><p class="s13">Micrometer</p></td></tr><tr><td><p class="s13">d) Shank length [mm]</p></td><td><p class="s13">+ 0,15</p></td><td><p class="s13">Micrometer, Dial</p><p class="s13">indicator, Comparator</p></td></tr><tr><td><p class="s13">e) Radius at center</p><p class="s13">of contact surface</p><p class="s13">R<span class="s14"><sub>1</sub></span> [mm]</p></td><td><p class="s13">Form A und B: Within the head thickness</p><p class="s13">tolerance</p><p class="s13">Form C: Allowable deviation from flatness: convex: within head thickness tolerance</p><p class="s13">concave: 0.005 d<span class="s14"><sub>1</sub></span></p></td><td><p class="s13">Comparator,</p><p class="s13">Comparator template, Radius gage</p></td></tr><tr><td><p class="s13">f) Radius at edge of contact surface R<span class="s14"><sub>2</sub></span> [mm]</p></td><td><p class="s13">Form A: Smooth transition to R<span class="s14"><sub>1</sub></span></p><p class="s13">Form B: 1.5 R<span class="s14"><sub>2</sub></span> allowed</p><p class="s13">Form C: <u><</u>0,1d<span class="s14"><sub>1</sub></span></p></td><td><p class="s13">Profile template,</p><p class="s13">Comparator, Radius gage</p></td></tr><tr><td><p class="s13">g) Radii</p><p class="s13">R<span class="s14"><sub>3 </sub></span>and R<span class="s14"><sub>5</sub></span> [mm]</p></td><td><p class="s13">Sligth rounding allowed</p></td><td><p class="s13">Comparator</p></td></tr><tr><td><p class="s13">h) Transition radius head underside to shank R<span class="s14"><sub>4</sub></span> [mm]</p></td><td><p class="s13">d<span class="s14"><sub>2</sub> </span><u><</u> 2 R<span class="s14"><sub>4</sub> </span><u><</u> 0,08 if covered by DIN 46240 pg.1 d<span class="s14"><sub>2</sub> </span>> 2 R<span class="s14"><sub>4</sub> </span><u><</u> 0,1</p><p class="s13">d<span class="s14"><sub>2</sub> </span>> 3 R<span class="s14"><sub>4</sub> </span><u><</u> 0,2</p></td><td><p class="s13">Comparator if in doubt: microsection</p></td></tr><tr><td><p class="s13">i) Allowed deviation</p><p class="s13">from cylindrical shape</p></td><td><p class="s13">max. 7° 30’: or d<span class="s14"><sub>2</sub> </span> <u><</u> l, l <u>></u> 0,7 mm and k <u><</u> 0,6 d<span class="s14"><sub>1</sub></span>.</p><p class="s13">max. 15°: for all other rivets</p></td><td><p class="s13">Comparator</p></td></tr><tr><td><p class="s13">k) Concentricity between head and shank center line [mm]</p></td><td><p class="s13">d<span class="s14"><sub>1</sub> </span><u><</u> 4 0,15</p><p class="s13">d<span class="s14"><sub>1</sub> </span>> 4 0,2</p><p class="s13">in general: approx. 70% of allowable deviation</p><p class="s13">per DIN 46240</p></td><td><p class="s13">Comparator, Special</p><p class="s13">turn fixture</p></td></tr></table>
==== Composite Contact Rivets====
Clad rivets for which only a part of the head (composite or bimetal rivets) or also
the shank end (tri-metal rivets) are composed of contact material – with the
<table border="1" cellspacing="0" style="border-collapse:collapse"><tr><td>d<sub>1</sub></td><td><p class="s13">k</p></td><td><p class="s13">1</p></td><td><p class="s13">d<sub>2</sub></p></td><td><p class="s13">α</p></td><td><p class="s13">r<sub>1</sub></p></td><td><p class="s13">s<sub>1</sub></p></td><td><p class="s13">s<sub>2</sub></p></td></tr><tr><td><p class="s13">3.0</p></td><td><p class="s13">0.8</p></td><td><p class="s13">2.0</p></td><td><p class="s13">1.5</p></td><td><p class="s13">7.5°</p></td><td><p class="s13">4.0</p></td><td><p class="s13">0.4</p></td><td><p class="s13">1.0</p></td></tr><tr><td><p class="s13">4.0</p></td><td><p class="s13">1.0</p></td><td><p class="s13">2.5</p></td><td><p class="s13">2.0</p></td><td><p class="s13">7.5°</p></td><td><p class="s13">8.0</p></td><td><p class="s13">0.5</p></td><td><p class="s13">1.2</p></td></tr><tr><td><p class="s13">5.0</p></td><td><p class="s13">1.2</p></td><td><p class="s13">3.0</p></td><td><p class="s13">2.5</p></td><td><p class="s13">10°</p></td><td><p class="s13">12.0</p></td><td><p class="s13">0.6</p></td><td><p class="s13">1.4</p></td></tr></table>
==== Braze Alloy Clad Contact Rivets====
For special cases, especially high surrounding temperatures with high thermal
and mechanical stresses during switching operations, a full metallurgical bond
mechanical staking.
====Contact Rivets with Brazed Contact Material Layers====
For certain applications contact rivets with non-ductile or brittle materials such
as tungsten, silver–tungsten, or silver–graphite are required. Rivets with these
