KERN & SOHN HK-D - Manual (Page 6)

Sauter GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected] Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Instruction Manual
HK-D
HK-D-BA-e-1311 6
2.1.2 Main unit
1: Shell 2: Communication socket 3: Impact device
socket 4: Keypad 5: LCD screen 6: Name plate
2.1.3 D type impact device
1 2 3 4 5 6 7
1: Release button 2: Loading sheath 3: Guide tube 4:
Coil part
5: Connection cable 6: Impact body 7: Support ring
2.1.4 Non conventional types of impact devices
DC DL C D+15 E G
2.2 Testing principle
Let an impact body whose weight is definite rush into the
surface of sample, the hardness value comes from the rate
of rebound velocity and rush velocity at 1mm distance from
testing surface. The calculation formula is following:
Fehler! Textmarke nicht definiert.HL=1000×VB/ VA
In which: HL——Leeb hardness value
VB——Rebounding velocity of the impact body
VA——Impacting velocity of the impact body
Output signal diagram of the impact device is as following.
3 Technical capabilities
3.1 Specifications
Measuring range: HLD（170～960）HLD
Measuring direction: 360°
Hardness scale: HL, HB, HRB, HRC, HRA, HV, HS
Display: LCD, 128×64 matrix LCD
Data memory: 48～600 groups （impact times: 32～1）
Range of upper and lower limit: the same as measuring
range
Working voltage: 2*1.5V
Continuous working period: approx. 200 h (no back light
on)
Communication interface: RS232
Accuracy and repeatability of displayed value, see table 5.
3.2 Dimensions, size and weight
3.2.1 Dimensions: 132Ч82Ч33mm (main unit)
3.2.2 Weight: approx. 0.6kg (main unit);
Table 5
No.
Type
of
impact
device hardness value
of standard
Leeb
hardness block
Error of
displayed
value
Repeatability
of displayed
value
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
4 Testing
4.1 Preparation and Inspection prior to testing
4.1.1 The preparation of work piece surface
The preparation for work piece surface should comply with
the relevant requirements specified in table 3
During the preparation for sample, the affect to surface
hardness of sample caused by overheating, cold
processing and etc. should be avoided as far as possible.
If the surface to be tested is too rough, measuring error will
appear. So the surface of the sample must have metallic
luster and the surface must be flat, smooth and have no oil
dirt.
Curved surface: it is better that the testing surface of work
piece is plane. When the curvature radius R of the curved
surface to be tested is less than 30mm (for D, DC, D + 15,
C, E and DL type impact device) and less than 50mm (for
G type impact device), a small support ring or non
conventional support ring should be used.
4
2
1
6
3
5