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Hardness tester impact device
The impact device of the hardness tester is an important component of the Leeb hardness tester. The impact device of the hardness tester has specifica
Product details
1. Hardness tester impact device - simplebetween
The Leeb hardness tester is a portable hardness tester that is easy to operate, and the impact device of the hardness tester is an important component.
The impact device of the hardness tester has specifications such as D-type, C-type, DC type, D+15 type, G-type, DL type, E-type, etc., which meet different needs according to the actual situation of the workpiece.
The D type is a standard type and commonly used specification. The C type is used for measuring the hardness of surface hardened components, surface coatings, and thin walls. The DC type is used for measuring in very confined areas (inside holes, inside cylindrical circles). The D+15 type is mainly used for measuring narrow grooves and deep holes. The DL type is used for measuring parts such as deep groove bottoms or profiles (such as tooth surfaces). The G type is used for testing hard and large specimens, such as forgings and castings. The E type is suitable for measuring specimens with extremely high hardness.
2. Hardness tester impact device - technical parameters
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Irregular impact device |
DC（D）/DL
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D+15
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C
|
G
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impact energy
Impact mass |
11mJ
5.5g/7.2g |
11mJ
7.8g |
2.7mJ
3.0g |
90mJ
20.0g |
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|
Ball head hardness:
Ball head diameter: Ball head material: |
1600HV
3mm tungsten carbide |
1600HV
3mm tungsten carbide |
1600HV
3mm tungsten carbide |
1600HV
5mm tungsten carbide |
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Diameter of impact device:
Length of impact device: Weight of impact device: |
20mm
86(147)/ 75mm 50g |
20mm
162mm 80g |
20mm
141mm 75g |
30mm
254mm 250g |
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Test piece * high hardness
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940HV
|
940HV
|
1000HV
|
650HB
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The average surface roughness Ra of the specimen:
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1.6μm
|
1.6μm
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0.4μm
|
6.3μm
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Test piece * small weight:
Directly measurable Stable support is required Need for dense coupling |
>5kg
2～5kg 0.05～2kg |
>5kg
2～5kg 0.05～2kg |
>1.5kg
0.5～1.5kg 0.02～0.5kg |
>15kg
5～15kg 0.5～5kg |
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|
Test piece * small thickness
Dense coupling Hardened layer * small depth |
5mm
≥0.8mm |
5mm
≥0.8mm |
1mm
≥0.2mm |
10mm
≥1.2mm |
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Ball indentation size
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|||||
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When the hardness is 300HV
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Indentation diameter
Indentation depth |
0.54mm
24μm |
0.54mm
24μm |
0.38mm
12μm |
1.03mm
53μm |
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When the hardness is 600HV
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Indentation diameter
Indentation depth |
0.54mm
17μm |
0.54mm
17μm |
0.32mm
8μm |
0.90mm
41μm |
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When the hardness is 800HV
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Indentation diameter
Indentation depth |
0.35mm
10μm |
0.35mm
10μm |
0.35mm
7μm |
--
-- |
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Scope of application of impact device
|
DC type measuring hole or cylinder; DL type measurement of slender narrow slots or holes
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D+15 type measuring groove or concave surface
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C-type measurement of small lightweight components and surface hardening layers.
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G-type measurement of heavy and rough surface castings and forgings
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3. Hardness tester impact device - testing range
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material |
Hardness system
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Impact device
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|||||
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D/DC
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D+15
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C
|
G
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E
|
DL
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||
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Steel and cast steel
Steel and cast steel |
HRC
|
17.9～68.5
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19.3～67.9
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20.0～69.5
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22.4～70.7
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20.6～68.2
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HRB
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59.6～99.6
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47.7～99.9
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37.0～99.9
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HRA
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59.1～85.8
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61.7～88.0
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HB
|
127~651
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80~638
|
80~683
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90~646
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83~663
|
81~646
|
|
|
HV
|
83~976
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80~937
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80~996
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84~1042
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80~950
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HS
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32.2～99.5
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33.3～99.3
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31.8～102.1
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35.8～102.6
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30.6～96.8
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Steel forged steel
|
HS
|
32.2～99.5
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CWT、ST
alloy tool steel |
HRC
|
20.4～67.1
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19.8～68.2
|
20.7～68.2
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|
22.6～70.2
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|
HV
|
80~898
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80~935
|
100~941
|
|
82~1009
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Stainless steel
stainless steel |
HRB
|
46.5～101.7
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HB
|
85~655
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|
HV
|
85~802
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GC. IRON
gray cast iron |
HRC
|
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HB
|
93~334
|
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92~326
|
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|
HV
|
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NC、IRON
ductile cast iron |
HRC
|
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HB
|
131~387
|
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127~364
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HV
|
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C．ALUM
cast aluminum alloy |
HB
|
19~164
|
|
23~210
|
32~168
|
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HRB
|
23.8～84.6
|
|
22.7～85.0
|
23.8～85.5
|
|
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BRASS
copper-zinc alloy |
HB
|
40~173
|
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HRB
|
13.5～95.3
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BRONZE Copper Tin (Aluminum) Alloy
|
HB
|
60~290
|
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COPPER Pure Copper
|
HB
|
45~315
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4. Hardness tester impact device - indication error and indication repeatability
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serial number
|
Type of impact device
|
Standard Leeb hardness block hardness value
|
indication error
|
indication repeatability
|
|
1
|
D
|
760±30HLD
530±40HLD |
±6 HLD
±10 HLD |
6 HLD
10 HLD |
|
2
|
DC
|
760±30HLDC
530±40HLDC |
±6 HLDC
±10 HLDC |
6 HLD
10 HLD |
|
3
|
DL
|
878±30HLDL
736±40HLDL |
±12 HLDL
|
12 HLDL
|
|
4
|
D+15
|
766±30HLD+15
544±40HLD+15 |
±12 HLD+15
|
12 HLD+15
|
|
5
|
G
|
590±40HLG
500±40HLG |
±12 HLG
|
12 HLG
|
|
6
|
E
|
725±30HLE
508±40HLE |
±12 HLE
|
12 HLE
|
|
7
|
C
|
822±30HLC
590±40HLC |
±12 HLC
|
12 HLC
|
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