DSH 391C Ball pressure test

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DSH 391C 0 M2 A( ?& B( Q4 m8 m( ] + q8 @; ^! m1 @% {" R+ A

Ball pressure test

4, 7, 9, Figure 2

60695-10-2(ed.2)

& e! u3 F. z3 u+ PStandard-
IEC 60695-10-2:2003, Ed.2
% S0 e; L. ]% O# N# k% O" FSubclause(s):
4
7
9
Figure 2
No. Year
DSH
4 o( _/ r8 v% f6 m0391C 2010
: K0 H! J% \! g5 ECategory:
VARIOUS, GENERAL
Developed by:
CTL-WG2 + WG4
Subject:
Ball pressure test
2 `. n5 {: l! `, V) YKey words:
; ?. o3 ~) A6 h0 o9 @5 V% s-Diameter of indentation
-Pressure Ball
7 T$ j$ _; B' h. @. x5 M; [-Test Specimen Support
Approved at the 48th CTL
Plenary Meeting, year
9 `0 v) H) _, `) a$ u0 R2011.
Replaces DSH 391 and
. K# N1 K( X' P9 H' [7 |, ADSH 391mod.
& Y4 e- {8 \- Q' W6 S# AQuestion:
Define the “best practice” test procedure for the ball pressure test based on the
* G* V5 c, f+ _requirements of the standard, and for practical reasons also based on 89/1011/CD, which
5 P0 \0 ]( F# _7 l* tis not in all respects identical with the requirements of the standard.
Decision:
) u" }: j9 C( K/ y! j9 `In addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling
+ W* B4 A5 a& M) fbearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure
comparable results.
9 `% j/ |5 Q6 X) @! uIn addition to clause 4.2 of the standard, the specimen support shall be a metal block of
steel, with a diameter
50 mm and a height of
100 mm or equivalent volume and mass.
In addition to 4.3 of the standard, a forced air convection single cabinet according to IEC
60216-4-1:1990, clauses 4.1.5 and 4.1.6 shall be used.
7 I" K, q* R9 M! V4 |0 }In addition to 7.1 of the standard conduct the test in air, in a heating cabinet being capable to
return within 5 min and without any temperature overshoot exceeding +5°C to the
! `9 j! U7 g  |previously adjusted and required air temperature within a tolerance of +/- 2°C .
Measure the air temperature as close as possible to the test specimen.
Before introducing the test specimen, bring the cabinet, the test apparatus and the test
5 K/ Q6 b4 d6 z5 dspecimen support to the required temperature and maintain the required test temperature for
24 h or until equilibrium conditions are reached, whichever occurs sooner.
When thermal equilibrium conditions are reached, place the test specimen on the approximate
$ w% e% \6 L$ P# k2 Zcentre of the test specimen support so that its upper surface is horizontal. Gently lower the
pressure ball on to the approximate centre of the test specimen. Ensure that no conditions exist
9 O9 R$ [3 f' B0 D/ l- m$ l! lthat will cause the pressure ball to move other than in a downward direction during the test.
After the ball pressure apparatus has been applied for 60 +2/-0 minutes, remove it and within 10
7 R% s7 \) ]# N5 j7 [/ a& _s immerse the test specimen in ambient temperature water for 6 min ±2 min.
Within 3 minutes of removal from the water, measure the diameter of the indentation caused by
the pressure ball to one decimal place.
Deviant from 7.2 of the standard, but in accordance with 89/1011/CD, the diameter “d” of
/ E7 [: ^" v" i+ Bthe indentation is to be measured as close as possible to the diameter of the “solid edge”
of the indentation according to both a) figure 2a shown below and b) picture examples
2 U7 Y1 z0 _  H  n: Q! E( Agiven in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall
. O0 V  @& s2 B) f4 ~/ jexclude any material deformation as shown in figure 2c below.
2 k# p! g# k! o7 f( S) E, o
2 h) |) b! R; d& F
! ~1 P( m8 {1 U: X  W" \! }


* o1 L7 M" b" i

mooch16

翻译来看看就好了。。。。。。。。。。