MRC HR-150AS User manual

Digital Display Manual
Rockwell Hardness Tester
HR-150AS
3, Hagavish st. Israel 58817 Tel: [phone], Fax: [phone]
[email protected]
MRC. 10.23

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Contents
1, Summary…………………………………………………………………………1
2, Application of hardness meter…………………………………………………2
3, Main technical parameters………………………………………………………3
4, Performance indicators ………………………………… …………………4
5, Use instructions……………………………………………… …………………4
6, product appearance…………………………………………… ………………5
7, Introduction of mechanism performance…………………… …………………6
8, Installation of hardness meter………… ………………… …………………7
9, Methods of operation and precautions………………………… ………………7
10, maintenance and calibration of hardness meters……………… ……………11
11, Statement of status …………………………………………… …………12
12, Packing list.…………………………………………… ……………………16
13, Certification…………………………………………………… ……………17
14, Warranty card…………………………………………… …………………18

ISummary
1, What is Hardness
It is the ability of material to resist elastic deformation, plastic deformation or
destructive force. For indentation hardness tests, hardness is the ability of a substance to
resist the indentation of another harder object of a certain shape and size into its surface.
2, The principle of Rockwell hardness Test
The Rockwell hardness measurement method is to press the test force F1 into the
surface of the specimen under the action of two test forces (initial test force Fo and total
test force F) applied successively with a specified pressure head. After the total test force is
maintained for a certain period of time, the main test force F1 is removed. Retaining the
initial test force, measuring the indentation depth H 1, indicating the Rockwell hardness by
the difference between the indentation depth H 1 and the indentation depth ho under the
action of the initial test force, and taking the axial displacement of the head as a Rockwell
hardness unit, Generally read directly from the dial, the principle of which is shown in the
following figure.
Rockwell hardness is shown by the following formula HR=K-
Type center C——Commonly used equal to 0.002mm
K——Constant when the diamond cone holder is used to 100，
When the ball head is used 130
Rockwell hardness test principle diagram
3, Characteristics of Rockwell hardness test
Rockwell hardness test adopts the method of measuring indentation depth, hardness
value is read out directly by indication, so it is simple and easy to operate, easy to master,
high work efficiency, suitable for the inspection of batches of parts and components.
Rockwell hardness test method can be used to measure hard and soft samples with
diamond head and rigid ball head. Therefore, Rockwell hardness test has been widely used
in production and has become a test of product quality. Determine the main testing means
of reasonable processing technology. Rockwell hardness tester is the most commonly used
testing instrument for hardness test, teaching and research work in production enterprises,
universities and colleges and scientific research institutions.
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II Application of Hardness Tester
Rockwell hardness test can choose different pressure head and test force according to the
range of，material hardness and different test thickness, and use different scale to express it.
The most commonly used scale is Agni Bian C scale. The test force and pressure head of
common scale are given in the following table. The numerical value of constant K and its
Application range and an example of its Application.
Range of use of Rockwell hardness meter
Rockw
ell
hardne
ss scale
Hardn
ess
symbol
Head type
Initial
test force
Fo（kg.）
Main test
force
F1（kg.）
Total test
force
F（kg.）
constant
scope of
application
Applicati
on
example
A
HRA
Diamond
cone head
10
50
60
100
20-88HRA
Hard
metals
and
cemented
carbides
B
HRB
Diameter
1.5875mm
ball head
10
90
100
130
20-100HRB
Nonferro
us metals
and soft
metals
C
HRC
Diamond
cone head
10
140
150
100
20-70HRC
Heat-trea
ted
structural
steel, tool
steel
D
HED
Diamond
cone head
10
90
100
100
40-77HRD
Surface
quenched
steel
F
HRF
Diameter
1.5875mm
ball head
10
50
60
130
60-100HRF
nonferrou
s metal
G
HRG
Diameter
1.5875mm
ball head
10
140
150
130
30-94HRG
Pearlite
iron,
copper-ni
ckel, zinc
alloy

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HRA：Suitable for the determination of metals whose hardness exceeds 70HRC,
such as tungsten carbide, cemented carbides, hard sheet materials and surface
hardened materials.
HRB：Used for the determination of soft or medium hardness materials such as
non-ferrous metals and their alloys, annealed steel or unhardened steel products.
HRC：Used to determine the hardness of heat-treated steel products such as
carbon steel, tool steel and alloy steel.
IIIMain technical parameters
1、Initial test force 98.07N（10kgf）
2、Total test force 588.4N（60kgf）980.7N（100kgf）1471N（150kgf)
3、indicator Digital display
4、Maximum height of specimen When the lead screw protector is added100mm
Without a lead screw cover170mm
5、Indentation center distance to machine wall 135mm
6、Hardness gauge shape dimensions 466×238×630mm
7、Hardness gauge net weight 65kg
IV Performance index
1、Support HRA, HRB, HRC hardness scales;
2、Very low power consumption, long service time, this product is powered by
CR2450 battery.
3、with HV,HB hardness conversion function.
4、the resolution is 0.1HR.
5、with time display.
6、with data output function, can be connected to the computer or serial micro
printer;

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VDirection for use
Initial Status
Increase Test Anvil and Touches
Indenter, start initial fore displays
295-305
If exceed 305,
then redo it
Start main force,
then timing
If index to 0, then
redo it
Reach to set time, unload
main force, show hardness
value on screen
If abnormal value,
redo it
Decrease test anvil,
remove initial force
Make next test
Calculate Average Value

VI Product appearance
1、ZERO/ON keystroke: short press reset, long press shut down;
2、Set key: short press select scales, long press clock setting;
3、CLR key: short press clear current measurement data;
4、Out key: long press output data;(recording data to a predetermined number of effective)
5、COVN key: short click average, long by switching conversion unit;
6、number button: set the average of test counts, max 9;
7、data output;
8、battery box
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Print output format
Hardness data output to printer or computer in ASCII code, baud rate
38400,n,8,1，The output format is as follows：
2014-9-27 16:40（time）
No HRC（Serial number）
01 61.2（first hardness test）
02 61.0 （second hardness test）
03 60.8 （3rd hardness test）Avg 61.0
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1、conversion units
8、force applied
2、conversion results
9、unit of force
3、Time indication
10、Mean value mark
4、Unit conversion mark
11、surveyor's rod type
5、power shortage alert
12、Surface Rockwell type supplement
6、hardness value
13、average total
7、head type
14、average current count

VII Brief introduction of Mechanism
performance
The hardness gauge consists of a fuselage, a test force applying mechanism,
a measuring indicator mechanism and a test piece support mechanism (see figure
1). The fuselage is a closed shell. Except for the table, the lead screw and the
handling handle, the other mechanisms are all installed in the fuselage shell to
keep clean.
The test force exerting mechanism consists of spindle, lead screw, blade,
weight buffer, weight transform mechanism, handle and so on.
The initial test force is mainly caused by the weight of parts such as spindle
(1) circular knife (2) long diamond knife (3) large lever (4) and small lever (21)
and the measuring pressure of indicator (24). When the specimen is in contact
with the pressure head and continues to rise so that the large and small lever is in
the horizontal position (indicator small pointer refers to Yu Hong point, the large
pointer is vertical up) due to the weight of the lever, etc., and the measuring
pressure of the indicator, The head can be subjected to (10kg) 98.07N of the
initial test force.
The total test force is composed of the main test force (generated bythe
weight of the weight) plus the initial test force, and two weights (10) and a hanger
ring (11) are arranged on the rack shaft (8) of the buffer (7). When the piston of
the buffer is lowered by the pull handle (15), the rack shaft (8) top rod (9) and
the hanger ring (11) weight (10) are also lowered with the pull handle (15), The
weight of the weight (10) and the ring (11) acts on the large lever (4) so that the
head is subjected to the total test force.
The fuselage is equipped with a weight variable load frame (12). When the
handle (13) is rotated to different positions, three different total test forces of
1471N or 980.7N or 588.4N can be obtained.
The oil needle (14) is used to apply the main test force to maintain a certain
speed and to avoid the impact phenomenon.
The handle (15) is used to apply the main test force, and the handle (16) is
used to remove the main test force. When the handle (15) is pulled, the cam (17)
and the gear (19) begin to rotate, and the rack shaft (8) push rod (9) and the
buffer piston fall with each other, At the same time, the handle (16) is rotated
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counterclockwise, and the main test force can be fully applied when the ring is
supported by a small knife (20) at the end of a large lever during the descent.
The measuring index mechanism is composed of a small lever (21), a lever
(5), an adjusting plate (22), a connecting rod (23) and an indicator (24), etc.
When the head of the rising specimen is pushed up, the lever (5) pushes up the
small lever (21) to rotate the pointer of the indicator through the connecting rod
(23).
The specimen support mechanism includes a worktable (25), a lead screw
(26), a handwheel (27), a lead screw seat (31), a protective sleeve (29), a flat
bearing (30). It is worth mentioning that compared with the same type of
hardness meter of other manufacturers, the hardness meter has increased the
protective cover (29) and the plain bearing (30) to avoid dust and debris sticking
to the support surface during use, thus reducing the wear on the support surface.
Thus, the operation is more lubricating and smooth, and the indication value is
more accurate and stable.
VIII Installation of hardness gauge
1、Unpacking(see figure 2)
（1）、By opening the top cover of the box and removing the four screws at
the bottom of the fuselage, the hardness meter can be installed in a dry, clean,
non-corrosive gas and vibration-free room. The hardness gauge table should be
sturdy and make holes larger than Φ50 mm in diameter for the lead screw to
pass through.
（2）、Check the completeness of accessories according to packing list.
（3）、open the upper cover (6) and the rear cover (19).
（4）、 loosen nut (8) remove hook head screw (9).
（5）、 remove the large lever fixed block (7) and the fixed support block
(1).
（6）、 release nut (13) remove hook head screw (12) remove weight fixed
pressure plate (14)
（7）、 hold the ring (10) with your hand and slowly lift up the weight
group (17) and remove the weight fixing support block (18) at the same time,
then gently drop the weight group (17). The weight cylinder pin (15) falls into the
groove of the bracket plate (16) to hold the weight.
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