insize ISHR-P151 User manual

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MN-ISHR-P151-E
OPERATION MANUAL
ISHR-P151
PORTABLE ROCKWELL
HARDNESS TESTER

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This Instruction Manual shall be carefully read through in prior to use of the
apparatus to clearly understand the detailed operation steps and special
notes, and avoid apparatus damage or personal injury caused by improper
use.
Attention
The hardness values can be read directly from the Rockwell and after
rapid and accurate operations. It can be considered as a non-
destructive testing with very small indentations. This kind of testers can
be used at site to test the finished or semi-finished work pieces piece
by piece in batches. Rockwell hardness testers are mostly applied in
the metal-processing enterprises.
It simplifies the operation steps of Rockwell Hardness Test: directly
load total test force; maintain it for a few seconds; release the total
test force and then the test is finished, with no step of maintaining
the preliminary test force of 10Kg.
It thoroughly follows the Rockwell Hardness Test Principle, and
complies with relevant regulation of ISO6508, and ASTM E18.
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Principle and Structure
The indenter is pressed (diamond cone or carbide ball ) into the
specimen surface in two steps. After maintaining the pressure for a
predetermined period of time, unload the major test force F1, and
measure the remaining indentation depth h under initial test force F0.
Rockwell hardness value is:
In this equation:
N — a constant related to scales; for A, C scales, N=100; for B scales,
N=130.
S — unit indentation depth, for Rockwell hardness it is 0.002mm.
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Descripition
1 — indentation depth under initial test force F0;
2 — indentation depth under total test forces F0+F1;
3 — elastic recovery depth when major test force F1 is removed;
4 — remaining indentation depth h;
5 — test piece surface;
6 — datum plane;
7 — position of indenter
anvil
indenter pin handwheel
magnifier
test force
bezel
handle
red dot

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Main Technical Parameters
Initial test force: 10kg
Test force: 30, 100, 150kg
Force applying method: by screw
Indenter: 120°diamond cone, Ø1.588mm carbide balls
Testing Items: HRC, HRB, HRA
Resolution: 1HR
Accuracy: Meets the requirements of ISO6508/6506
Application: All metals, including steel, forged steel, cast iron, copper,
copper alloy, aluminum, aluminum alloy and carbides etc.
Operation
Test Conditions:
Make sure the surface is flat and smooth. It is forbidden to have scale,
decarburized layer, steel pit or dust on the surface of the part.
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Set the load dial to “0”:
Check the indicator, it should rest exactly on the red dot “0” on the
indicator dial. If it doesn’t, adjust the dial by turning the bezel to locate
the red dot.
Fix the test piece:
Put the test piece into the opening of the tester with its back side
contacting the anvil tight, and be sure to keep its testing surface vertical
to the principal axis of the indenter. Turn the hand wheel to make the
main shaft of the tester move to the left, and the indenter is made to hit
on the test piece surface.
Apply initial test force:
Slowly turn the hand wheel
clockwise to bring the indicator
to the position of initial force
F0 (for Rockwell Hardness
Tester F0=10Kg.
5Set the full scale line to “0”:
Rotate the rotational drum dial anticlockwise until its pin rests against
the upper edge of the magnifier. Meanwhile, the operator should adjust
the observing angle to make the full-scale benchmark line on the fixed
drum dial (the red scale mark 130, black scale mark 100) exactly
aligned beneath the reading scale mark of the magnifier. The operator
should keep this viewing angle also known as the viewing angle for
reading the hardness value until the test is finished.
6Load and unload major test force:
Rotate the hand wheel stably clockwise to bring the indicator to the
position of total test force F=F0+F1 (e.g., for HRC scale, F=150kg). The
indicator should be aligned exactly to the marked scale of the selected
test force. If the goes beyond the scale mark, the testing
should be considered as failure. Then unload the test force and choose
a new point on the test piece to make a new test.
The time duration from loading initial test force to loading total test
force should be no more than 8 seconds.
After loading total test force, the test force should be maintained 3 to
5 seconds. Then completely unload major test force within 2 seconds
to bring the indicator back to the position of initial test force F0.
indicator
Test force
60kg
100kg
150kg
Scale
HRA
HRB
HRC

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7Take the reading:
Looking through the magnifier, determine the superposition of reading
line of the barrel dial aligned with that of the magnifier, the value of
which represents the hardness value of this test.
Each long scale mark on the rotational drum dial represents 10
hardness units, and the value is shown above the mark. Between every
two long scale marks there are 10 graduations, each of which indicates
1 hardness units.
Read the black numbers under C on the rotational drum dial for Scales
HRA, HRC which test with diamond indenter; read the red numbers
under B on the rotational drum dial for Scales with ball
indenter.
which test
8Unload the initial force:
Rotate the hand wheel stably counter-clockwise to bring the indicator to
the position of red dot and remove the workpiece.