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| 2. Normal
Dimension Tolerance: |
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| (1). |
The dimension range of length,
width or diameter of powder metallurgy contact
is normally between 3.5mm ~ 85mm. |
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| (2). |
Contact of AgNi, AgWC+C or AgC
requires re-pressing process, thus, F type is a
better choice. |
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3. Ag Thickness ( t )
£º |
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The Ag thickness
of powder metallurgy contact should be over
1.0mm minimum.(The Ag layer should be increased
accordingly when contact area is enlarged.)
While Ag layer is below 1.0mm, we suggest to use
internal oxidation contact instead. While Ag
layer is over 3.0mm to maximum 15mm, we suggest
to use single press mold. (Ag layer is adjusted
in accordance with the contact dimension. Ag
layer thickness should be finalized only after
sample producing.) |
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4. Cambered Surface
(R) £º |
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(1) Cambered
surface: Includes long-side camber, short-side
camber and sphere camber. |
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(2) The curvature of cambered surface
will change after oxidation process. The general
tolerance is ¡À 10R as it requires larger
tolerance. |
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5. Corner Radius ( r )
£º |
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Corner radius
requires at least over 0.5r,because Powder
metallurgy contact is crumbly, and lack of
contact corner radius might cause corner
collapse for square, rectangle or trapezoid
shape. |
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6. Brazing Alloy
(Solder Backing) £º |
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| (1). |
Cadmium-free brazing alloy - BAg-5
& BAg-6 are suggested. But the contacts for
MCCB could be brazed with BCuP-5 MCCB requires
less life cycle than other types of switches.
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| (2). |
The utility extent of brazing
alloy depends on the contact area accordingly.
(The bigger area is, the larger utility extent
shall be.) The brazed area should be over 50% of
the contact area. After being brazed, the
bonding area should be more 70% of the contact
area. The thickness of brazing alloy depends on
the material properties. After the welding
process, the welding alloy should spills from
the contact surrounding closely to be visible
(the hickness is between1/2 and 1/3 of the
contact thickness). |
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7. Reference design of
powder metallurgy contact £º |
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(1)Tolerance of
contact thickness (T): |
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(Contact is liable to shrink and
change shape in sintering.) |
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| Thickness(mm)
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Contact Area(mm 2 ) |
Thickness
Tolerance(mm) |
| 1.00 ¡« 1.50 |
25 ¡« 150 |
¡À 0.10 |
| 1.51 ¡« 2.00
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25 ¡« 150 |
¡À 0.15
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| 2.01 ¡« 3.00
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25 ¡« 150 |
¡À 0.20
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| 1.00 ¡« 1.50
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151 ¡« 200 |
¡À 0.15
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| 1.51 ¡« 2.00
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151 ¡« 200 |
¡À 0.20
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| 2.01 ¡« 3.00
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151 ¡« 200 |
¡À 0.25
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| 1.51 ¡« 2.00
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201 ¡« 320 |
¡À 0.20
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| 2.01 ¡« 3.00
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201 ¡« 320 |
¡À 0.30
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| 3.01 ¡« 4.00
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321 ¡« 400 |
¡À 0.50
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(2) The tolerance
for length, width or diameter is ¡À 0.20mm.
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(3) The tolerance
for surface camber ( R ) is ¡À 10R. |
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(4) Tolerances for
special dimensions or dimensions out of above
range is other specified.
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