11
12
Line 1: The diameter of the steel ball is 2 5mm
.
Test force : 1839N
Line 2: The diameter of the steel ball is
Ø2.5mm
.
Test force: 612.9N
Line 3: The diameter of the steel ball is
Ø2.5mm
.
Test force: 306.5N
Line 4: The diameter of the steel ball is
Ø2.5mm
.
Test force: 306.5N
Ø .
Table 3:
hardness HRC, HRB
The relationship between the minimum thickness and
Table 4: The relationship between the minimum thickness and
hardness HV
According to the shape of the test piece, select suitable platform.
If the test piece is special shaped, the test platform which is
attached together with this hardness tester cannot meet the
requirement, then you should base upon the geometric shape of
the test piece to design a special test platform by yourself.
Turn the loading handle of the hardness tester counter clockwise
to push it forward, so as to make the load in an unloading state.
2
Procedures for test:
Select the indenter according to the hardness test method (table
1). Insert the handle of the indenter into the axial hole of the
surveying rod and slightly turn the fixed screw.
Select the test force according to the hardness test method.
Turn the changing handwheel clockwise, in order to make the
loading figures needed correspond to the fixed calibrated line.
Note:
When the test force used is 294.2N, you should open the
rear cover, take away
all weights including the small "0" weight.
Place the test piece reliably on the test platform, then turn the
rotating wheel to make the screw rod lift upward, when the test
piece is in contact with the indenter, the projecting target rod will
lift correspondingly, finally, keep the baseline of the target rod
