2,315
edits
Changes
→Plattierte Kontaktnietes
gepressten Drahtabschnitte aus dem duktilen Kontaktwerkstoff und
dem Trägerwerkstoff Kupfer (<xr id="fig:Cold_bonding_of_bimetall_rivets"/><!--(Fig. 3.1)-->). <figure id="fig:Cold_bonding_of_bimetall_rivets">
[[File:Cold_bonding_of_bimetall_rivets.jpg|right|thumb|Figure 14: Kaltpressschweißen von Bimetallnieten (schematisch)]]</figure>). Die Presskraft muss so hoch sein, dass
sich die Gitterbausteine der beiden Metalle auf Abstände von wenigen Atomradien
annähern und so die anziehenden Kräfte zwischen den Atomen wirksam
Beim Warmpressschweißen wird die erforderliche Wärme durch kurzzeitigen
Stromfluss erzeugt (<xr id="fig:Hot_bonding_of_bimetal_rivets"/> <!--(Fig. 3.2)-->). <figure id="fig:Hot_bonding_of_bimetal_rivets">[[File:Hot_bonding_of_bimetal_rivets.jpg|right|thumb|Figure 5: Warmpressschweißen von Bimetallnieten (schematisch)]]</figure>). In der Stromenge zwischen Kontaktwerkstoff und
Trägerwerkstoff entsteht dabei im Falle der Kombination Ag mit Cu eine
schmelzflüssige eutektische Silber-Kupfer-Legierung. Bei Verwendung metalloxidhaltiger
Kopfdurchmesser > 8 mm und silberhaltigen Kontaktauflagen angewandt.
*Typische Kontaktformen für Bimetallniete (<xr id="fig:Typical_contact_shapes_for_composite_rivets"/>)
<figure id="fig:Typical_contact_shapes_for_composite_rivets">
[[File:Typical_contact_shapes_for_composite_rivets.jpg|right|thumb|Figure 6: Typische Kontaktformen für Bimetallniete]]
</figure>
*Kontaktwerkstoffe <br /> Ag, AgNi 0,15 (ARGODUR), AgCu, AgCuNi (ARGODUR 27), Ag/Ni (SINIDUR), Ag/CdO (DODURIT CDO), Ag/SnO<sub>2</sub> (SISTADOX), Ag/ZnO (DODURIT ZNO)<br />
*Trägerwerkstoffe <br /> Cu <br />
daher die Rücksprache mit dem Hersteller. <br />
<figure id="fig:Dimensional_ranges">
[[File:Dimensional_ranges.jpg|right|thumb|Figure 7: Abmessungsbereiche]]
</figure>
*Qualitätsmerkmale und Toleranzen (<xr id="fig:Quality_criteria_and_tolerances"/>)
<figure id="fig:Quality_criteria_and_tolerances">
[[File:Quality_criteria_and_tolerances.jpg|left|Figure 8: Qualitätsmerkmale und Toleranzen]]
</figure>
<tr><th><p class="s13">Criteria</p></th><th><p class="s13">Form B Form C</p><p class="s13">Trapezoidal head, Trapezoidal head radiused flat</p></th><th><p class="s13">Suggested test</p><p class="s13">equipment</p></th></tr><tr><td><p class="s13">a) Head diameter</p><p class="s13">d<span class="s14"><sub>1 </sub> </span>[mm]</p></td><td><p class="s13">During optical measurement disregard corner radius R<span class="s14"><sub>3</sub> </span><u>+</u> 0.1</p></td><td><p class="s13">Comparator, measu-</p><p class="s13">ring microscpope</p></td></tr><tr><td><p class="s13">b) Head thickness</p><p class="s13">k [mm]</p></td><td><p class="s13">+ 0.1</p></td><td><p class="s13">Micrometer,</p><p class="s13">Dial indicator</p></td></tr><tr><td><p class="s13">c) Shank diameter</p><p class="s13">d<span class="s14"><sub>2</sub> </span>[mm]</p></td><td><p class="s13">Deviation from roundness and conical shape of</p><p class="s13">shank only within allowed diameter tolerance d<span class="s14"><sub>2</sub> </span> <u><</u> 1.5 - 0.08</p><p class="s13">d<span class="s14"><sub>2</sub> </span>> 1.5 - 0.1</p></td><td><p class="s13">Micrometer</p></td></tr><tr><td><p class="s13">d) Shank length l</p><p class="s13">[mm]</p></td><td><p class="s13">+ 0.15</p></td><td><p class="s13">Micrometer, Dial 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 B: <u>+</u> 10%, but not below</p><p class="s15">+<span class="s13"> 0.5 mm</span></p><p class="s13">Form C: Allowable deviation from flatness: convex: within head thickness tolerance concave: 0.005 d<span class="s14">1</span></p></td><td><p class="s13">Comparator, Comparator template, Radius gage, Profile template</p></td></tr><tr><td><p class="s13">f) Radius at edge</p><p class="s13">of contact surface</p><p class="s13">R<span class="s14"><sub>2</sub> </span>[mm]</p></td><td><p class="s13">per DIN 46240: Form B and C max. 0.5 without DIN:max. 1</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</p><p class="s13">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 d<span class="s14"><sub>2</sub> </span>> 2 R<span class="s14"><sub>4</sub> </span><u><</u> 0.1 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: micro-section</p></td></tr><tr><td><p class="s13">i) Allowed deviation from cylindrical shape</p></td><td><p class="s13">d<span class="s14"><sub>1</sub> </span> <u><</u> 4 up to 7°30’ + 2°30’</p><p class="s13">d<span class="s14"><sub>1</sub> </span>> 4 up to 10° + 5°</p></td><td><p class="s13">Comparator, Measu- ring microscope, if in doubt: microsection</p></td></tr><tr><td><p class="s13">k) Concentricity bet-</p><p class="s13">ween head and shank center line [mm]</p></td><td><p class="s13">5% of d<span class="s14"><sub>1</sub></span></p></td><td><p class="s13">Comparator,</p><p class="s13">Measuring microscope, Special turn fixture</p></td></tr><tr><td><p class="s13">l) Contact layer</p><p class="s13">thickness [mm]</p></td><td><p class="s13">In center area of 0.5 d<span class="s14"><sub>1</sub> </span>s<u>></u> nominal thickness</p><p class="s13">Remaining head area must be covered</p></td><td><p class="s13">Measuring micros- cope, Microsection</p></td></tr></table>
*Typische Kontaktformen für Trimetallniete (<xr id="fig:Typical_contact_shapes_of_tri-metal_rivets"/>)
<figure id="fig:Typical_contact_shapes_of_tri-metal_rivets">
[[File:Typical_contact_shapes_of_tri-metal_rivets.jpg|right|thumb|Figure 8: Typische Kontaktformen für Trimetallniete]]
</figure>
*Kontaktwerkstoffe <br /> Ag, AgNi 0,15 (ARGODUR), AgCu, AgCuNi (ARGODUR 27), Ag/Ni (SINIDUR), Ag/CdO (DODURIT CDO), Ag/SnO (SISTADOX), Ag/ZnO (DODURIT ZNO)<br />
*Trägerwerkstoffe <br /> Cu <br />
*Abmessungsbereiche (<xr id="fig:Dimensional_ranges2"/>)
<figure id="fig:Dimensional_ranges2">
[[File:Dimensional_ranges2.jpg|right|thumb|Figure 9: Abmessungsbereiche]]
</figure>
*Standardwerte für Nietabmessungen
