5
6
scale
indenter
test force(N)
HRA
HRB
HRC
diamond taper indenter
(cone angle
)
120°
ball indenter
(ball dia.=1.5875mm)
diamond taper indenter
(cone angle120°)
588
980
1471
HRD
HRF
HRG
diamond taper indenter
(cone angle120°)
ball indenter
(ball dia.=1.5875mm)
588
1471
980
ball indenter
(ball dia.=1.5875mm)
f. The measuring surface of the test material should be clear
and without greasy dirt, oxide skin, grooves or clear
machining traces, and the roughness of the measuring
surface no more than 0.8µm is proposed.
scale, test force and weight application form
test force(N)
588
980
1471
scale
HRA/HRF
HRB/HRD
HRC/HRG
g
a
fter installation, put the up cover and back cover on.
weight
d weight A
d weight A + weight B
d weight A + weight B + weight C
Usage
3.1 Preparation before use
a. Choose the right stage according to the shape and size of
the test sample.
b. Choose indenters and forces according to the material and
hardness scale(as below table shows).
Material(example)
carbide
steel
,
surface
carburizing and
quenching steel
mild steel, aluminum alloy,
copper alloy, malleable
iron, annealed steel
annealed steel,
tempering steel,
alloy steel, stainless steel
sheet steel,
case-hardening steel
magal, mild cast iron,
thin mild steel plate,
annealed copper alloy
phosphor bronze,
beryllium bronze,
malleable iron
c. Install indenters: put the indenter to spindle hole, ensure
the spindle hole, end face, end handle of indenter and shaft
shoulder clear with nothing. Tighten the lock screw at the end
handle of indenter.
Attention
: take the indenter tip with fingertip when
installation to avoid the indenter falling down and cause
indenter tip damaged.
d. Rotate the test force dial to choose test force.
Attention:
choose test force should go on under unload state.
e. Adjust load dwell time to five seconds from adjusting “+”
and “-”buttons.
