8
"beep" sound, and stop and turn the hand wheel, loading indicator light, power automatically load
test run to reach the selected force value, the security charge started, security charge indicator
lights, loading light is off, and the countdown time until the end of Dutch insurance, insurance
charge indicator off, automatic unloading, and unloading indicator, after the light has gone out of
unloading, the reverse rotation roller to the work piece and the pressure head torn off and the lever
back to the starting position and turn the dial 5 (Figure10 ) in front of the light source to align
indentation, border observation of the slow counter-clockwise rotation of roller edge 4, until you
find the indentation edge completely clear up, then the measuring position is measured as the
focal plane position, and finally through the eyepiece micrometer 6, measured on the
measurement methods are detailed in Chapter 8.
Test force
：
62.5Kg
f～250Kgf is 1 file，Auto-loading value≥40Kgf.
500Kg
f～3000Kgf is a file，Auto-loading value ≥90Kgf.
Note: Automatic loading hardness value shall be the minimum force value work. Do not operate
the roller will force exceeds this value too much, as slightly larger than this value. When the
hardness started working (AB), the screen does not show the force change process, when the
preview set to reach the test force, the only starting to show.
4.3.4
The choice of test force should make indentation diameter within
0.25D<d<0.6D
d
——
Indention diameter (
To ensure this value, please select the 0.102F/D2 according Table 1 ,the
value of F units of the formula N. )
D
——
ball diameter
Figure 1
Material
Brinell hardness
0.102F/D
2
Steel
30
Cast iron
<140
10
≥140
30
copper and copper alloy
<35
5
35
～
130
10
>130
30
Light metals and their
alloys
35
2.5
35
～
80
5
，
10
>80
10
