YUSHI LM-100 User manual

CONTENT
1.Principle of Leeb hardness testing method..............................................1
2. Summary ...................................................................................................2
2.1 LM-100.............................................................................................2
2.2 D type impact device.......................................................................3
2.3 Type of Impact Devices...................................................................4
2.4 Impact devices introduction:..........................................................4
2.5 Standard delivery:...........................................................................5
2.6 Optional accessories: ......................................................................6
3. Functions and Applications......................................................................7
3.1 Technical Specifications..................................................................7
3.2 Applications.....................................................................................7
4 .Pre-Treatment of Workpiece....................................................................8
4.1 Workpiece Requirements ...............................................................8
4.1.1 Surface Roughness requirements .......................................8
4.1.2 Weight and Thickness Requirements.................................8
4.1.3 Surface Hardened Layer.....................................................8
4.1.4 Curved surface Requirement..............................................8
4.2 Support of Test piece.......................................................................9
5. Operation...................................................................................................9
5.1 Display..............................................................................................9
5.2 Keyboard.......................................................................................10
5.3 Turn on the instrument.................................................................10
5.4 Parameters Setting........................................................................10
5.4.1 Material...............................................................................10
5.4.2 Hardness Scale ................................................................... 11
5.4.3 Impact devices.................................................................... 11
5.4.4 Impact Direction ................................................................ 11
5.4.5Average times...................................................................... 11
5.5 Measuring......................................................................................11
5.6Average value.................................................................................12
5.7 Data save and read settings ..........................................................12
5.7.1 Storage testing result..........................................................12
5.7.2 Reading................................................................................13
5.7.3 Delete...................................................................................13
5.8 Blue tooth and print......................................................................13
5.9 Calibration (Error-correction settings).......................................14
6. Maintenance & servicing........................................................................14

1.Principle of Leeb hardness testing method
The impact body, which is equipped with tungsten carbide, impacts into the
work piece and rebounds back. The rebound and impact velocities are
measured at the 1mm point from the work piece in the following way: the
integrated permanent magnet will produce directly proportional voltage with
the impact velocity. The Leeb hardness values are calculated by the following
formula:
HL=1000×( Vb / Va )
In Which：HL: Leeb hardness values
Vb: the voltage produced during the rebound of impact body
Va: the voltage produced during the impact of impact body
Figure 1 shows the voltage produced during the impact and rebound of impact
body:
Figure 1 voltage features of output signal
The Leeb hardness values can be converted to other hardness scales directly,
such as HV, HRC, HRB, HB and HS.
2. Summary
2.1 LM-100
1 2

2.2 D type impact device 2.3 Type of Impact Devices
2.4 Impact Devices Specification:
Special Impact
Device
D/DC/DL
D+15
C
G
E
Impact Energy
11mJ
11mJ
11mJ
11mJ
11mJ
Mass of Impact Body
5.5g/7.2g
7.8g
3.0g
20.0g
5.5g
Test Tip Hardness
1600HV
1600HV
1600HV
1600HV
5000HV
Test Tip Diameter
3mm
3mm
3mm
5mm
3mm
Test Tip Material
Tungsten
carbide
Tungsten
carbide
Tungsten
carbide
Tungsten
carbide
Tungsten
carbide
Impact Device Diameter
20mm
20mm
20mm
30mm
20mm
Impact Device Length
86/147/75mm
162mm
141mm
254mm
155mm
Impact Device Weight
50g
80g
75g
250g
80g
Max. Hardness of Sample
940HV
940HV
1000HV
650HV
1200HV
Average surface roughness
Ra:
1.6μm
1.6μm
0.4μm
6.3μm
1.6μm
Min. Weight of Sample:
Of compact shape
On solid support
Coupled on plate
>5kg
2~5kg
0.05~2kg
>5kg
2~5kg
0.05~2kg
>1.5kg
0.5~1.5k
g
0.02~0.5
kg
>15kg
5~15kg
0.5~5kg
>5kg
2~5kg
0.05~2kg
Min. thickness of sample:
5mm
5mm
1mm
10mm
5mm
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Coupled
Min. thickness of layers
》0.8mm
》0.8mm
》0.2mm
》1.2mm
》0.8mm
Indentation of test tip
With
300HV
Diameter
0.54mm
0.54mm
0.38mm
1.03mm
0.54mm
Depth
24μm
24μm
12μm
53μm
24μm
With
600HV
Diameter
0.54mm
0.54mm
0.32mm
0.90mm
0.54mm
Depth
17μm
17μm
8μm
41μm
17μm
With
800HV
Diameter
0.35mm
0.35mm
0.35mm
--
0.35mm
Depth
10μm
10μm
7μm
--
10μm
Impact Device
applicable scope
DC used for
very confined
spaces such as
holes,
cylinders,
internal
measurement.
DL used for
extremely
confined
spaces.
D+15 for
measurin
g in
grooves,
recessed
surface.
C used for
testing
case
hardened
or thin
walled
components
.
G used for
solid
heavy
component,
such as
rough
castings
and
forgings.
E used for
high
hardness
material.
2.5 Standard delivery:
LM100 main unit
D type impact device
HLD value Standard Calibration Block
DataView software
USB Communication cable
Small supporting ring
Cleaning brush
User`s manual
Protective Rubber case
Suitcase
2.6 Optional accessories:
Impact device DC/C/DL/D+15/G
Standard Calibration Test Block
Blue tooth module & Thermal Printer
Standard supporting ring
Small Supporting ring
Special supporting rings (see following table)
No.
Code
Model
Special Support
Ring Sketch
Notes
1
03-03.7
Z10-15
Measure outside the
cylindrical surface R10~R15
2
03-03.8
Z14.5-30
Measure outside the
cylindrical surface
R14.5~R30
3
03-03.9
Z25-50
Measure outside the
cylindrical surface R25~R50
4
03-03.10
HZ11-13
Measure inside the cylindrical
surface R11~R13
5
03-03.11
HZ12.5-17
Measure inside the cylindrical
surface R12.5~R17
6
03-03.12
HZ16.5-30
Measure inside the cylindrical
surface R16.5~R30
7
03-03.13
K10-15
Measure outside the spherical
surface SR10~SR15
8
03-03.14
K14.5-30
Measure outside the spherical
surface SR14.5~SR30
9
03-03.15
HK11-13
Measure inside the spherical
surface SR11~SR13
10
03-03.16
HK12.5-17
Measure outside the spherical
surface SR12.5~SR17
11
03-03.17
HK16.5-30
Measure outside the spherical
surface SR16.5~SR30
12
03-03.18
UN
Measure outside the
cylindrical surface，adjustable
radius R10~∞
5 6

3. Functions and Applications
3.1 Technical Specifications
Measuring Method: Leeb Hardness Testing method
Hardness Scale: HL, HB, HRB,HRC,HV,HS, σb.
Measuring Range : HLD (200-960) HRC（19.8-68.5）HB（30-651）HV
（80-976）HS（26.4-99.5）HRB（13.5-100）σb(375-2639).
Impact device: D type impact device (Standard); Optional C/G/DC/DL/D+15
Accuracy: ＜±6HLD (HLD=800), Repeatability 6HLD (HLD=800)
Measuring direction: 360 degree by manual setting
Material : Steel& Cast Steel, Stainless Steel, GC IRON, NC IRON, Cast
Aluminum alloy, Macht metal, Copper-tin alloy, Brass
Resolution: 1HL, 1HV, 1HB, 0.1HRB, 0.1HRC, 0.1HS
Display: LED with backlight.
Memory: 100 groups (each group include 1-7 testing result and 1AVE value)
Communication: USB port (Standard) and Blue tooth (Optional)
Printer: Thermal Printer with blue tooth (optional)
Power: 2 AA batteries
Working temperature: -10℃~ +50℃
Size: 153 ×76×37 (mm) (H×W×D)
Weight: 280g include batteries
Standard: GB/T 17394-2014,ASTMA956
Warranty: 12 months after purchase
3.2 Applications
Installed machinery and Permanent assembly parts
Mould cavity
Heavy workpieces
Failure analysis of pressure vessel, turbine and other equipments
Small test area
The production line of Bearings and other parts
Distinguish the material of the metal material warehouse
4 .Pre-Treatment of Workpiece
4.1 Workpiece Requirements
4.1.1 Surface Roughness requirements
Surface roughness is an important requirement for the surface of the test piece,
it should be smooth and no oil, or will cause measurement errors.
The surface roughness requirements are listed in table 4.1
Impact Device Type
Work piece surface roughness Ra
D, DC, D＋15
2um
G
7um
C
0.4um
4.1.2 Weight and Thickness Requirements
Impact device
type
Min weight
Min thickness
（no coupling）
Min thickness
（coupling）
D、DC、D＋15
5kg
25mm
3mm
G
15kg
70mm
10mm
C
1.5kg
10mm
1mm
4.1.3 Surface Hardened Layer
Impact device
Min. depth of surface hardened layer（mm）
D, DC, D＋15
0.8
C
0.2
4.1.4 Curved surface Requirement
Curved surface: The best testing surface of sample is flat. When the curvature
radius R of the surface to be tested is smaller than 30mm (D, DC, D+15, C, E
and DL type of impact device) and smaller than 50mm (G type of impact
device), the small support ring or the special support rings should be chosen.
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4.2 Support of Test piece
The heavy workpiece do not need support
The Mid-heavy workpiece must be placed on a flat, sturdy surface, and
absolutely smooth placement, without any shaking.
Light workpiece must be tightly coupled with the solid support body, the
coupling surface must be smooth, and Coupled dosages don’t too much,
Test direction must be perpendicular to the coupling surface.
When the workpiece is a large area of Sheet, Pole and Bending Parts,
Even if a large weight and thickness may still cause deformation, so
reinforcement and support in the rear surface of the test point is necessary.
5. Operation
5.1 Display
5.2 Keyboard
5.3 Turn on the instrument
Press to power on the LM100, the screen will display the default interface
for the first time, then power on again will display the last parameters
automatically,
5.4 Parameters Setting
5.4.1 Material
Press “MTL” button to choose the material, code no. from 0-8:
Code
Hardness
Tensile strength
0
Steel and Cast Steel
C
1
GC. IRON
CrNi
2
NC. IRON
CrMo
3
C. ALUM
CrV
4
BRASS
CrMnSi
5
BRONZE
SSST
6
COPPER
SST
7
SST
CrNiMo
8
Forging Steel
Cr
9
Alloy tool steel
9 10

5.4.2 Hardness Scale
Press “HD” to choose the Hardness scale and strength:
5.4.3 Impact devices
Press “Probe” button to select probes.
5.4.4 Impact Direction
Press “DIR” button to select impact direction
5.4.5Average times
It is very necessary to work out the average measuring values in hardness
testing. Different measuring times between 1-7 can be selected according to
user`s different requirements
Press “TIME” button to set the impact times from 1-7 which will calculate the
AVE value after the certain times.
5.5 Measuring
5.5.1 Operating
After finish the parameters setting, then start measuring:
Load the impact body: Pushing the loading-tube until contact is felt. Then
allow it to slowly return to the starting position locking the impact body.
Press the impact device support ring firmly on the surface of the sample,
the impact direction should be vertical to the testing surface.
Press the release button on the upside of the impact device to test. The
sample and the impact device as well as the operator are all required to be
stable now.
After testing, the tester will display as following:
5.5.2 Reject the Gross Error Value
During the measuring process, if the deviation between the measured value and
standard value is too big before the mean value displaying, the current
measured value can be deleted by press “DEL” button, and the current value
would be neither stored nor in averaging, the impact times minus one.
5.6 Average value
When the impact times reach the setting parameter “TIME”, then the tester will
display the following average value and will show the symbol “Ave”
3-5 times is usually used in normal measurement
5.7 Data saving and read settings
5.7.1 Storage testing result
Press “MEM” button to set the saving function, the “S” symbol will be showed
11 12

on the screen.
The tester will save testing results automatically, including 7 testing results and
1 average value each group, and total 100 groups can be stored.
Note: Please store the data by pressing the “MEM”key before the average
value is displayed in the current group test.
5.7.2 Reading
In saving status, press and hold the “MEM” button to enter the reading mode
and the symbol “R” will be showed on the display. At the same time, the first
impact value in the recently saved groups will be displayed, press “up” and
“down” button to read the saved testing value.
Then press (or long press) “MEM” to quit the storage function, and the symbol
“R” disappears.
5.7.3 Delete
Press “DEL” button in reading mode to delete one group data. Long press
“DEL” button to delete all stored values.
5.7.4 Data Transmission
The data in stored can be transferred from the instrument to a PC via
communication software, to save, statistic and analyze the measurement. (See
the help documentation in communication software for details)
5.8 Blue tooth and print （Optional）
Press “Blue Tooth” button to connect with the Thermal Printer then the groups
testing data will be printed.
5.9 Calibration (Error-correction settings)
Measuring error can be usually caused by test tip abrasion or changing another
impact device. So it is necessary to correct the error to make the measurement
accurate.
Press “up”and “down” button at the same time after power on, then the tester
will enter calibration mode, the identification of calibration appears.
Impact the standard block continuously until get the average values, then press
“up” and “down” button to adjust the value to the standard value, finally press
the store button to finish the calibration, the tester will save the cal data and
exit the calibration mode.
If you want to give up the calibration suddenly, please press the “power off”
button directly in Calibration mode.
6. Maintenance & servicing
After long time using, the impact device has been used for 1000-2000 times,
please use the cleaning brush to clean the tube and impact body.
unscrew the support ring first, then take out the impact body;
Spiral the nylon brush in counter-clock direction into the bottom of
the tube and take it out for 5 times
Install the impact body and support ring.
Release the impact body after use.
Any lubricant is absolutely prohibited inside the impact device.
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