ALPA H-Master LB151AU User manual

ELECTRONIC UNIVERSAL HARDNESS TESTER LB151AU

Lingua originale: Inglese

REV. 1 - 11/19

H-Master

metrology

DESCRIPTION

1.Panel Shell

2.Dial Gauge

3.Fastening Screw of Indenter

4.Indenter

5.Testing Anvil

6.Up and Down Lead Screw

7.Load-Change Hand Wheel

8.Rotating Wheel

9.Emergency Stop

10.Control Button

11.Back Cover

12.Upper Cover

13.Power Socket

14.Power Switch

15. The Frame

13 14

CONTENTS

1. TECHNICAL DATA

2. BRIEF INTRODUCTION

3. INSTALLATION OF HARDNESS TESTER

4. ROCKWELL HARDNESS

5. BRINELL HARDNESS

6. VICKERS HARDNESS

7. MAINTENANCE AND PRECAUTIONS

8. STORAGE AND SHIPPING NOTICE

H-Master

metrology

1.1 TECHNICAL DATA

Rockwell Scales: HRA, HRB, HRC, HRD, HRE, HRF, HRG, HRH, HRK, HRL, HRM, HRP, HRR,

HRS, HRV

Preliminary Test Force: 10Kgf (98.07N) Permitted Error: ±2.0%

Test Force: 60Kgf (588.4N), 100Kgf (980.7N), 150Kgf (1471N)

Permitted Error:±1.0%

Dwell Time: Adjustable 1-60s

Hardness Indication: 5.2” Touch Screen, Resolution:640x480

Resolution: 0.1HR

Loading Control: Auto Loading/Dwell/Unloading

Hardness Conversion: HRC, HV, HBS, HBW, HK, HRA, HRD, HR15N, HR30N,

HR45N, HS, HRF, HR15T, HR30T, HR45T,HRB

Conversion Standards: ASTM, DIN

Language Option: Chinese, English, German, Portuguese, Turkish, Czech, Korean

Correction Range: -3.0HR to +3.0HR, Step 0.1HR

Data Memory: 2000 Single Measuring Result, Curve Analysis, Results

Reviewing And Analysis

Data Output: Optional Blue Tooth Mini Printer

Max. Height Of Specimen: 175 mm

Instrument Throat: 165 mm

Power supply: AC220V/50Hz; AC110V/60Hz

Dimension (LxWxH): 546 x 182 x 755 mm

Packing Dimension: 620 x 460 x 870 mm

Gross/Net Weight: 120Kg / 90Kg

Execution Standard: GB/T230.2, JJS Z2245, EN-ISO6508, ASTME-18

2. BRIEF INTRODUCTION

• Hardness is one of the important mechanic characteristics of

the material while the hardness testing is an important method

to judge the quality of the metal material or its component

parts. The hardness of the metal is correspondent to its

mechanic characteristics, and so its mechanic characteristics

such as the strength, tiredness, wriggling and wearing out can

be tested out approximately through its hardness testing.

• The Motorized Brinell Rockwell & Vickers Hardness Tester,

a multi-functional hardness tester with Brinell, Rockwell

&Vickers 3 kinds of testing methods and 7 steps testing force

will meet the needs of many kinds of hardness measurement.

The instrument is adopted automatic shifter to load, dwell and

unload testing force, rotate the Load-Change Hand Wheel to

change values of testing force, therefore the operation for this

instrument is simple, easy and quickly. Beside set zero to the

dial, there is no man made error for operation. The present

instrument is with high sensitivity and stability, so as t for

usage in workshop and testing laboratory.

PRECAUTIONS

1. Carefully read the Operation Manual before you use the

hardness tester and get to know thoroughly the operation

procedure and the usage precautions so as to avoid the

damages to the hardness tester and the safety accidents

caused by the improper operation.

2. All the bands and the anti-shock tapes should be carefully

removed before the hardness tester is installed and

calibrated.

3. The single-phase 3-pin socket should be used for the power

source of the hardness tester and the ground connecting

cable should meet the safety requirements.

4. It is strictly prohibited to tamper with the installed position

of all the electric component parts, switches, and sockets

of the hardness tester without permission, otherwise it will

cause accident.

5. It should not to turn the force knob or the Rotating Wheel

during the loading and unloading operations and the dwell

time of the test force.

6. Our company tries to improve the quality of the hardness

testers and renew their structure. In case the contents in

the Operation MANUAL are a bit different with the actual

structure of the instrument, it is hoped and apologized for

the fact that the further notice will not be given.

H-Master

metrology

3. INSTALLATION OF THE HARDNESS TESTER

3.1 The working condition of the hardness tester

3.1.1 Under the room temperature between 10~30°C;

3.1.2 The relative humidity in the test room shall not be over 65%;

3.1.3 In an environment free from vibration and shock; without

corrosive in surroundings.

3.2 THE UNPACKING OF THE HARDNESS TESTER

3.2.1 Cut the belts on packing box, loosen off the screws at

bottom of packing box, remove the upper body of packing box,

and take out accessories kit.

3.2.2 Unscrew two (2) M10 outer hexagonal bolts under the

bottom plate with a spanner, to separate the hardness tester

from the bottom plate.

3.2.3 After unpacking, the hardness tester shall be placed on a

stable working table horizontally, with horizontal deviation less

than 1mm/m. A hole shall be drilled at an appropriate location

on the working table (see Fig.1) to enable the Up and Down

Lead Screw to operate properly. We suggest the height of

working table should be about 500mm.

3.4 THE INSTALLATION OF THE WEIGHT GROUP (FIG.3)

3.4.1 During installation of weights, the instrument should be in

the state without any test force.

3.4.2 The weights shall be placed on the hanging rod (17) tray

one by one according to the sequence from the bottom to the

top, and the test force shall be rotated to change the handwheel

so that all weights can be reset to the normal position.

3.5 THE CORRESPONDENCE RELATION AMONG

HARDNESS SCALE--TEST FORCE--WEIGHTS IN

WORKING STATUS (TABLE 1).

Fig.1

Fig. 3

Hardness Scale Test Force Graduated Value of Load-Changing Hand Wheel Force on the Weight (Weight Code )

HV, HB 294.2 (30kg) 306.5 7

HB 306.5 (31.25kg) 306.5 7+1

HRA 588.4 (60kg) 588.4 7+1+6

HB 612.9 (62.5kg) 612.9 7+1+6+5

HV,HB,HRB 980.7 (100kg) 980.7 7+1+6+5+4

HRC 1471 (150kg) 1471 7+1+6+5+4+3

HB 1839 (187.5kg) 1839 7+1+6+5+4+3+2

Table 1

H-Master

metrology

3.6 INSTALLATION OF MEASURING MICROSCOPE

3.6.1 Take out the microscope body of the measuring

microscope from the accessory box, install and x it on the

microscope frame on the left side of the main body.

Align the two locating pins and tighten them with screws.

3.6.2 Install the micrometer eyepiece. Tighten the screws.

3.6.3 Install 4x objective lens (10x objective lens is used for

Vickers indentation measurement) and tighten it.

One or more adjusting washers may be installed between the

objective lens and the connecting pipe, be careful not to remove

them.

3.6.4 在Install the light tube on the objective lens, insert the

power plug of the lamp into the jack on the side of the body and

tighten the back cap.

3.7 ANVIL INSTALLATION

There are two types of 4 anvils for hardness tester. They are:

at anvil and V-shape installed in the middle hole of lifting lead

screw, and at anvil and V-shape anvil installed on the sliding

test bench.

Installation of the middle hole of the lead screw: insert the

handle of the anvil into the hole at the upper end of the lead

screw.

Installation of sliding test stand: rst slightly rotate and lower

the lead screw protective cover. Insert the handle of the sliding

test stand into the hole at the upper end of the lead screw, and

screw the back cap onto the lead screw. Then install the test

bench on the slider of the test bench. Readjust the height of the

protective cover to fully cover the lifting lead screw.

To facilitate the horizontal adjustment of the hardness tester, a

at anvil can be installed in the lead screw hole rst.

3.8 HORIZONTAL ADJUSTMENT

Place the level gauge on the anvil, adjust the position and

posture of the hardness tester, and adjust the levelness of the

hardness tester within 1 / 1000 mm.

3.9 INDENTER INSTALLATION

There are ve indenters in the standard of universal hardness

tester, and the installation method is the same.

Wipe off the rust proof oil stain on the pressure head, insert it

into the installation hole at the lower end of the pressure shaft,

and use the set screw to tighten it.

Fig4 Microscope Body Installation

Fig5 Anvil Installation

4. ROCKWELL HARDNESS

4.1 The Technical Specications of Rockwell Hardness

4.1.1 The Initial Test Force: 98.07N (10Kg)

4.1.2 The Total Test Force : 588.4N (60Kg), 980.7N (100Kg),

1471N(150Kg)

4.1.3 The Indenter: The Diamond Rockwell Indenter, The

ф1.5875 mm Ball Indenter

4.1.4 The Tolerance of Rockwell Hardness Display Value (Table 2)

Hardness Scale Hardness Range of The Standard Testing Blocks The Max. Tolerance of Display Value

HRA 20~≤75HRA ±2HRA

>75~≤88HRA ±1.5HRA

HRB

20~≤45HRB ±4HRB

>45~≤80HRB ±3HRB

>80~≤100HRB ±2HRB

HRC 20~≤70HRC ±1.5HRC

Table 2

H-Master

metrology

4.3 THE OPERATION PROCEDURE OF THE ROCKWELL

HARDNESS TESTER

4.3.1 Connect the Power Socket (13) with power source,

then turn on The Switch (14), nixie tube of the Touch Panel (10)

will light.

4.3.2 According to hardness grade of the specimen, select

Scale form Table 3. Turn the Load-Change Hand Wheel

clockwise to conrm the total testing force.

4.3.3 Push the indenter (4) into the hole of main spindle

closely against the supporting plane and make the caved

plane of the indenter handle face to the screw. Fasten slightly

the Fastening Screw for the Indenter (3), and then place the

specimen on the Working Table (6).

4.3.4 Turn the Rotating Wheel (7) clockwise, lift the Up

and Down Moving Shaft, enable the specimen slowly touch

the indenter without any shock until the short pointer in dial

indicator of the instrument move from black point to red point,

at this time, the long pointer turn 3 cycles then indicate towards

to position “C” vertically (When testing HRB hardness value,

the long pointer indicate towards to position “B”. When testing

Brinell & Vickers hardness value, it is no necessary to set Zero).

At this point, it has loaded initial Test Force 98.07N (10Kg), the

There are 3 kinds of testing scale for Rockwell Hardness such as A, B & C.

Scale Indenter Initial Test

Force(N)

Total Test

Force(N) Applications

HRA Diamond

Indenter

98.07

(10kg) 588.4 Hard alloy, carbide, surface-quenched steel, carburized

steel plate (sheet)

HRD 980.7 Steel sheet, surface-quenched steel

HRC 1471 Quenched steel, tempered steel, Hard cast iron

HRF

Ball Indenter

φ1.5875mm

(1/16 inch)

588.4 Cast iron, aluminum, magnesium alloy, bearing alloy,

annealed copper alloy, mild steel sheet

HRB 980.7 Mild steel, aluminum alloy, copper alloy, malleable cast

iron, annealed steel

HRG 1471 Phosphor bronze, beryllium bronze, malleable cast iron

HRH Ball Indenter

φ3.175mm

(1/8 inch)

588.4 Aluminum, zinc, lead, etc

HRE 980.7 Bearing alloy, tin, hard plastic and other soft materials

HRK 1471

Fig. 3

4.2.1 The surface of the specimen should be smooth and clean

without any feculence, oxidized peels and concaves, on the

outstanding without processing signs.

4.2.2 The Min. thickness of the specimen should be 10 times

superior to the depth of the indentation. After the test, the back of

the specimen should not have any visible signs of deformation.

4.2.3 The specimen should be stably xed on the working

table. There should be no any movement of the specimen

during the testing process and the test force should be loaded

perpendicularly on the specimen.

4.2.4 When the specimen is columned in shape, the V-shaped

testing table must be used. When testing HRC or HRA hardness

value, the diameter of the specimen is smaller than 38 mm and

when testing HRB hardness value, the diameter of specimen is

smaller than 25 mm, the results of the test should be revised. The

revised values are all positive numbers. (Table 4).

4.2 DO ALL PREPARATION WORK BEFORE THE USE

Table 3

H-Master

metrology

Fig 4

offset of long pointer could not exceed 5 Rockwell hardness

units, otherwise the Rotating Wheel shall turn anticlockwise and

the position of specimen be changed for another repeat test.

4.3.5 Rotate the Dial (2) of the instrument to let long pointer

indicate position “C”.

4.3.6 Press “START” key on the touch panel, the motor

begin to work, the instrument load the test force automatically.

When dwell time of total test force is up, the motor rotates to

unload the test force automatically.

4.3.7 At this time, the data indicated by the long pointer

in dial indicator of the instrument is the hardness value of the

specimen tested (when testing HRB hardness for the specimen,

the hardness value should be readout from the data in the inner

ring of the dial).

4.3.8 The dwell time of total test force for Rockwell hardness

measurement is 5 seconds. The dwell time can be adjusted by

pressing up and down key on the touch plane.

4.3.9 Turn the Rotating Wheel in anticlockwise to let the

Working Table go down, change testing position for other test

and repeat above mentioned operation process.

4.3.10 The number of the point to be tested is not less than 5

(the rst point in not include.) The number of the points to be

tested may be reduced a bit for the specimen tested in a serial.

Hardness value HR

Diameter (mm) of the Columned Specimens

6 10 13 16 19 22 25 32 38

Modied Value (HR) of Rockwell Scales A, C & D

20 2.5 2.0 1.5 1.5 1.0 1.0

25 3.0 2.5 2.0 1.5 1.0 1.0 1.0

30 2.5 2.0 1.5 1.5 1.0 1.0 0.5

35 3.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5

40 2.5 2.0 1.5 1.0 1.0 1.0 0.5 0.5

45 3.0 2.0 1.5 1.0 1.0 1.0 0.5 0.5 0.5

50 2.5 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5

55 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0

60 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 0

65 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 0

70 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0 0

75 1.0 0.5 0.5 0.5 0.5 0.5 0 0 0

80 0.5 0.5 0.5 0.5 0.5 0 0 0 0

85 0.5 0.5 0.5 0 0 0 0 0 0

90 0.5 0 0 0 0 0 0 0 0

Table 4

H-Master

metrology

24. Connecting Rod

25. Screw Nut

26. Screw

27. Protecting Gasket

Hardness Range

(HBW)

Tolerance of

Displayed Value

(%)

Repetition of

Displayed Value

(%)

≤125 ±3 3

125≤HBW≤125 ±2.5 2.5

≤225 ±2 2

Table 5

Table 6

4.4 THE REGULATION OF DISPLAYED HARDNESS VALUE

(Fig.5)

he precision of the displayed hardness value of the hardness

tester is just calibrated before the instrument is turned out of the

factory. If an error is caused due to the transportation, the operator

may regulate it based on the understanding of the instrument

structure and principle. The method is as follows: Remove

the Upper Cover. If the displayed hardness value is in inferior

to the hardness value of standard hardness block, withstand a

screwdriver into the groove of the M4 Screw and unscrew the

nut (25) a little. Rotate the Screw (26) clockwise to forward a bit

(about rotate it half cycle, the hardness value is 1 degree higher),

then calibrate the zero position (C position) for dial indicator,

withstand the Screw Rod and fasten the nut. Do the test and

display hardness value until the diaplayed hardness value stands

in the tolerance range (Table 1). If the displayed value is higher

than the hardness value of the standard hardness block, rotate

the Screw in the opposite direction. (There are screwdriver and

spanner in the accessories kit.)

5. BRINELL HARDNESS

5.1 The Technical Specication of Brinell Hardness Tester

5.1.1 Test Force: 306.5N(31.25Kg), 612.9N(62.5Kg), 1839N

(187.5KG)

5.1.2 Ball Indenter: ф2.5 mm, ф5 mm

5.1.3 The Brinell Hardness Testing Range: 8HBW~650HBW

5.2 The Tolerance and Repetition of Displayed Value for

Brinell Hardness Tester

5.3 The test force should make the indentation diameter

within the range of 0.25D < D < 0.6d: when d = 0.37d, the

hardness value obtained is very accurate (d-indentation

diameter, d-ball diameter).

5.4 Select 0.102F/D2 according to Table 6

5.5 The corresponding relationship among the scale, indenter

and test force (Table 7)

5.6 Preparation Before Use(Ref. 4.2.1, 4.2.2)

The minimum thickness of the test piece should be greater than

10 times the depth of the indentation. After the test, there shall

be no visible deformation marks on the back of the test piece.

(Table 8)

Fig. 5

Material Brinell Hardness 0.102F/D2

Steel —— 30

Cast iron <140 10

≥140 30

Copper & copper

alloys

<35 5

35~130 10

>130 30

Light metals & their

alloys

35 2.5

35~80 5,10

F—Test Force (N) D—Ball Diameter (mm)

Hardness Value (HR)

Diameter(mm)of the Columned Specimens

6 10 13 16 19 22 25

Modied Value (HR) of Rockwell Scales B, F & G

20 4.5 4.0 3.5 3.0

30 5.0 4.5 3.5 3.0 2.5

40 4.5 4.0 3.0 2.5 2.5

50 4.0 3.5 3.0 2.5 2.0

60 5.0 3.5 3.0 2.5 2.0 2.0

70 4.0 3.0 2.5 2.0 2.0 1.5

80 5.0 3.5 2.5 2.0 1.5 1.5 1.5

90 4.0 3.0 2.0 1.5 1.5 1.5 1.0

100 3.5 2.5 1.5 1.5 1.0 1.0 0.5

H-Master

metrology

Hardness Scale Indenter D (mm) Test Force F 0.102F/D2

HBW 10/100 10 980.7N (100kg) 1

HBW 5/62.5 5 612.9N (62.5kg) 2.5

HBW 2.5/187.5 2.5 1839N (187.5kg) 30

HBW 2.5/62.5 2.5 612.9N (62.5kg) 10

HBW 2.5/31.25 2.5 306.5N (31.25kg) 5

HBW 1/30 1 294.2N (30kg) 30

Table 7

Indentation Average

Dimameter (d)

Tested-piece Minimum Thickness

Ball Diameter(D)

D=1 D=2.5 D=5 D=10

Indentation Average

Dimameter (d)

Tested-piece Minimum Thickness

Ball Diameter(D)

D=1 D=2.5 D=5 D=10

Table 8

0.4 0.33

0.5 0.54

0.6 0.8 0.29

0.7 0.4

0.8 0.53

0.9 0.67

1 0.83

1.1 1.02

1.2 1.23 0.58

1.3 1.46 0.69

1.4 1.72 0.8

1.5 2 0.92

1.6 1.05

1.7 1.19

1.8 1.34

1.9 1.5

2 1.67

2.2 2.04

5.7 Proper Use

5.7.1 Refer to 4.3.3-4.3.6 in Chapter 4 of Rockwell hardness

(holding time of Brinell hardness test force; 10-15 seconds for

ferrous metal, 30-35 seconds for non-ferrous metal, and 60

seconds for Brinell hardness value less than 35).

5.7.2 Alignment

Adjust the sliding test bench so that the indentation on the

test piece is directly below the objective lens of the measuring

microscope for observation and measurement. For a small

number of tests, you can move the test piece and take

In the microscope eld of view. During batch test, in order to

save the time of indentation search, the stop screws at both

ends of the sliding test bench can be used for adjustment so as

to make the pressure.

The mark is directly in the visible position of the microscope

eld of view.

Fig 8 Sliding Test Bench Adjustment

5.7.3 Focus

First, rotate the eyepiece on the micrometer eyepiece to the

internal scribe line to achieve the clearest.

By rotating the lifting hand wheel, the up and down movement

of the test piece driven by the lifting lead screw is adjusted

to the most clear test surface or indentation of the test piece

observed from the microscope.

2.4 2.46 1.17

2.6 2.92 1.38

2.8 3.43 1.6

3 4 1.84

3.2 2.1

3.4 2.38

3.6 2.68

3.8 3

4 3.34

4.2 3.7

4.4 4.08

4.6 4.48

4.8 4.91

5 5.36

5.2 5.83

5.4 6.33

5.6 6.86

5.8 7.42

6 8

H-Master

metrology

At Fig 10

Brinell Hardness Test:

4X obejective lens, indenter Φ2.5, test force 187.5kg.

Indication 3.40mm

Indentation Diameter d=3.40/4=0.85=850μ m,

Hardness Value: 320.6HB

Vickers Hardness Tester:

10X objective lens, test force 30kg

Indication 4.30mm

Indentation Diameter d=4.30/10=0.43mm=430μ m,

Hardness Value:300.9HV

Fig10 measurement and calculation

Fig9 Measurement in Two Vertical Directions

Hardness

Sign

Value of

Hardness

Block

Tolerance of

Displayed

Value

Value of

Hardness

Block

Repetition

Displayed

Value

HV30

HV100

≤250HV ±3% ≤225HV 6%

HV100 ±2% >225HV 4%

Table 9

6. VICKERS HARDNESS

6.1 Technical Specications of Vickers Hardness

6.1.1 Test forces: 294.2N(30 Kg), 980.7N(100Kg)

6.1.2 Indenter: Vickers Diamond Indenter

6.1.3 Testing Range of Vickers Hardness: 40HV ~ 1000HV

6.1.4 The Tolerance and Repetition of Displayed Value for

Vickers Hardness Teste (Table 9)

6.1.5 By means of 10X Objective for Vickers hardness testing,

the amplication of measuring microscope is 150X.

6.2 Do all preparation work before do testing.

6.2.1 The surface of the specimen should be smooth and

clean without any feculence, therefore to guarantee the length

of diagonal of indentation could be measured accurately. The

degree of surface nish should not less than 0.8

6.2.2 Put the specimen stably on the testing table, its touching

surface should be clean. It is prohibited to move the specimen

during measurement, and the test force should be loaded on

the specimen keep vertically.

6.2.3 The Min. thickness of specimen or testing layer should

not less than 1.5 times diagonal length of the indentation. After

testing, the back of specimen should not have any visible signs

of deformation.

5.7.4 Illumination Adjustment

The most suitable lighting effect is obtained by rotating or

moving up and down the lamp barrel. Tighten the three knurled

screws after adjustment. The brightness and color of the lighting

light can be adjusted by two buttons on the side of the lighting

barrel to achieve the most appropriate lighting effect.

5.7.5 Measurement and Reading of Indentation Size

Loosen the knurled screw on the eyepiece so that the eyepiece

can rotate without falling. Rotate the micrometer eyepiece so

that its measuring direction is consistent with the diameter or

diagonal direction of the indentation.Align the edge (Brinell) or

vertex (Vickers) of one side of the indentation with the zero line

of the microscope. Rotate the percentile cylinder to move the

index line to the other edge or vertex.

Read out the large number (mm) of the indentation size from

the internal scribe and the decimal number (0.01mm for each

small cell) from the scale of the cylinder. The sum of the two is

the measurement size of the indentation.

Dividing the measured size of the indentation by the

magnication of the objective lens used is the actual size of

the indentation (indentation diameter or indentation diagonal

length).

For example: when using 4x objective, it should be divided by 4;

when using 10x objective, it should be divided by 10 Calculated

hardness value: 300.9hv

6.3 Test Vickers Hardness

6.3.1 Refer to 5.7 of Brinell hardness for the operation sequence

of Vickers hardness tester. It is mainly different from: For ferrous

metals, the holding time of test force is 10-15 seconds, and for

non-ferrous metals is 30 ± 2 seconds;

6.3.2 The measurement of the two diagonals of the indentation

is carried out in two directions perpendicular to each other.

6.3.3 The ratio of the difference between the average value

of hardness test and the hardness value of standard block to

the hardness value of standard block is the indication error of

hardness tester; the ratio of the maximum difference between

hardness values and the average value is the indication

repeatability of hardness tester. Indication error and repeatability

shall be in accordance with (Fig 9)

H-Master

metrology

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