DSH 391C Ball pressure test

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 391C ! A  O7 _9 G6 j, W

Ball pressure test 3 z( {: R) V0 t' X

4, 7, 9, Figure 2 6 N! i+ Z  F7 H* {

60695-10-2(ed.2)

Question:
/ o" m; c/ H! I9 |" IDefine the “best practice” test procedure for the ball pressure test based on the requirements of the standard, and for practical reasons also based on 89/1011/CD, which is not in all respects identical with the requirements of the standard.
Decision:
In addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling bearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure comparable results.
0 D) Q$ B% v! Q. ~1 LIn 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.
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 previously adjusted and required air temperature within a tolerance of +/- 2°C .
5 ]+ Q; t3 e( B4 z9 |' MMeasure 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 specimen support to the required temperature and maintain the required test temperature for 24 h or until equilibrium conditions are reached, whichever occurs sooner.
7 z) N9 ]4 E% C+ K6 aWhen thermal equilibrium conditions are reached, place the test specimen on the approximate centre 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 that 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 s immerse the test specimen in ambient temperature water for 6 min ±2 min.
3 A: }7 ]1 ~! v" e1 k+ x7 W2 fWithin 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 the 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 given in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall exclude any material deformation as shown in figure 2c below.
1 K, c0 {3 K) H* Q0 C, z# q7 T: ]The measuring instrument shall have an optical magnification between 10 x and 20 x and shall incorporate a calibrated reticule or cross-travel measuring table. A lighting device may be needed to provide appropriate illumination of the surface of the test specimen for measurement.
. T) I% b2 p" lThe result is expressed as a pass if the diameter of the indentation does not exceed 2,0 mm.
* P( [+ G( z. Q/ Q/ cIn case of non-round indentation obtained, report the biggest diameter measurement observed. The maximum difference between the longest and shortest measurement should not exceed 0,2 mm.
  P, g5 Y" Q3 }# ^+ o! c3 A' tIn case of doubt, make two further tests on two other test specimen, both of which shall meet the pass criteria.
3 x" [, a8 B/ m; X9 V$ [- A- g; j