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[Various] DSH 391.mod. A Ball pressure test

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发表于 2012-11-8 21:06 | 显示全部楼层 |阅读模式
广东安规检测
有限公司提供:
DSH 391.mod. A
2 N- f$ m! P. l

" k; {( K8 ]# k2 n6 K4 ^: e
Ball pressure test
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5 – 7.1, Fig. 1 – Fig. 29 s# i6 L  f8 S& ^
60695-10-2(ed.1)
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Standard(s): IEC 60695-10-2/2003 No. Year. T) l! B: |: |* x
Corrigendum 1 (February 2006)
5 M# }' f: A1 ?* x2 ADSH7 `' f4 \) |* X  S, z+ Q  g. Y
391.mod. A4 x. N3 `6 x# ^6 }- R1 {
2009; h' L/ F1 f9 l4 g/ o
Category: VARIOUS+ v) j2 I1 G/ h
Subclause(s): 5 – 7.1( U- x7 H- J; Q: ~. T
Fig. 1 – Fig. 2
% z) C- f1 ^" F, {Developed by: WG4+ u. z# w0 K* M' D9 [1 e, e# U
Subject: Ball pressure test K e y w o r d s :; n( V+ N& m& b4 z$ A* |
- Lens with a reticule
  L- e4 @" }7 J( C" i8 V- Diameter of the
  j* y9 u% t. u. f5 S, findentation; X7 I3 b# _2 u" R/ S! @
- Steel ball
7 A9 s2 C& X' c- Test specimen support2 ]' b3 k' @" \' z4 c
- Loading device
5 X! e! a, ]7 T1 V5 c5 L: W  B0 [Decision approved at the1 q  i5 m, E4 z, W7 @
46th CTL Plenary Meeting, in
/ [, v- W! D' J2009, g+ B4 q% }; y8 G0 r8 y* o; Q
Question:% R# M- o6 A! J  Q, y5 q. Y
Define the “best practice” test procedure for ball pressure test consistent with the requirements in
6 C; O8 g. h4 {4 `1 N, Athe standard.; @2 |& O: ~0 r. o9 b1 K8 M# f
Decision:
9 `5 t* J9 c$ G" JClause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of& C' o9 [3 n' t% t  A4 M
+/- 2°C.
4 X, @! l- W0 M4 L* ]Before introducing the test specimen, bring the test apparatus, the test specimen support and loading
# Y* D& o1 I( k' adevice to the required temperature and maintain them at the required temperature for 24 h or until
* N: Q: I! k$ Kequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as+ ^4 Z* g1 l' K
possible to the test specimen.
3 [* Y) C7 ?8 m- a3 f( j( b3 kPlace the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.68 P2 H: T% ?8 Z+ @  T6 c- @) e
of IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate
- ^( ~& E& m0 Q  M  C! w5 Y" }8 tdimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball
! P/ u: v+ U8 _: mis pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
. [- @4 F. F7 o& Hduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and; l$ k1 i8 a; h# Q4 V/ \& B
immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
: V8 x0 |) K, l  c0 W' ythe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.5 T8 ]) q* V- x8 f
Clause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation" X9 K7 W4 w0 }" O( ~
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes+ w. Y/ p  @# R8 L. q- |  `
any material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make2 T8 C4 [  C1 j( `+ z
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall
6 a" m" h3 w7 J+ D; S1 i! emeet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)3 p) d; y  N% H! t$ d& B
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens4 W: ?+ k# Z# V2 P* t4 J- o  i
(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting
: \+ E: i" C( Fdevice to enable the illumination of the surface of the test specimen. For measuring the diameter of the
. V. ?! v% k8 j  {indentation, the reticule is moved from one side to the other." d" _! |- R5 }; p7 D7 ]: I5 ]
In case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround
0 U9 n. E- b/ _/ L% h; U* D: Dindentation obtained, indicate on the Report the longest measurement observed, maximum3 P% \, G4 i& q  M0 ^* G
allowable difference between the longest and shortest measurement: 0,2 mm.
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5 _) G. \) B4 V0 ]

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