ZHU/zwickiLine

Universal hardness tester for instrumented indentation tests

The ZHU/zwickiLine universal hardness testing machine is based around the zwickiLine materials testing machine. It can be used both for classical hardness testing methods (Rockwell, Vickers, Brinell, ball-indentation) and for the innovative instrumented indentation method for determining hardness plus other material parameters of metallic materials (Martens hardness, ISO 14577). In addition, cyclic indentation tests with increasing test load or indentation depth and partial unloading are implemented in the testXpert testing software.
Hardness measurement head for ZHU/zwickiLine
  • Instrumented indentation test
  • Optical hardness testing methods (Vickers, Brinell, Knoop)
  • Depth measurement methods (Rockwell and similar)

The ZHU/Z2.5 is the most flexible, most versatile hardness testing machine in the world.

Dr Erhard Reimann

An Overview of the Essentials

Advantages and features of ZHU/zwickiLine

  • User-friendly one-button operation.
  • Universal, material-dependent application for practically all hardness testing methods featuring indentation depth measurement.
  • Fast, automatic approach, including with different specimen heights.
  • Fully automatic test sequence and evaluation.
  • Shortest possible test times.
  • Minimal resetting when changing between methods or changing indenter and sensor foot.
  • High measured-value resolution and consistent testing conditions deliver high measured-value accuracy and reproducibility.
  • Determination of additional material characteristics from the force-indentation depth curve.
  • Versatile results display: individual and statistical values, graphs, screen display and printouts can generally be changed freely.
  • Multiple curve for direct comparison of tests in a series.
  • Configuration of user-specific test sequences: special test sequences can also be defined and performed easily.
  • Can be used for in-production tests.

Applications

  • Overall the hardness measuring head covers all hardness tests employing indentation measurement, including:
  • Martens hardness HM, instrumented indentation test
  • Rockwell hardness scales A to K, N, T, plus HMR5/250
  • Rockwell hardness scales R, L, M, E, K, α
  • ball indentation hardness (for plastics)
  • Vickers depth measurement HVT
  • Brinell depth measurement HBT

Instrumented hardness testing for determination of the Martens hardness HM of metals is standardized in EN ISO 14577-1. The purpose of this standard is to define a universal hardness scale. This scale covers all hardness grades from thermoplastic films to very hard metals, enabling improved comparability of material behavior.

  • The force-indentation depth curve and different sequences of the loading process allow more comprehensive description of mechanical material properties, including:
  • plastic and elastic portions of the indentation energy
  • Martens hardness HM
  • volume hardness HMs
  • indentation hardness HiT
  • elastic indentation modulus Eir
  • creep behavior
  • creep relaxation behavior

Features of the optical testing unit

  • Flexible adaptation of test parameters, e.g. approach speed, loading and unloading rates.
  • Ability to test HM and HV with one indentation.
  • Test load-indentation depth curve can be displayed and evaluated with all test methods.
  • Optical monitoring of specimen surface.
  • Traverse tests can be freely defined and imported and exported. This applies to all methods.
  • Any desired hardness traverse tests can be performed in addition to Vickers traverse tests.
  • These features apply when optical hardness test methods are used.

Erweiterter Anwendungsbereich

  • In addition to the classical methods of hardness testing (Vickers, Rockwell, Brinell) and to the instrumented indentation test, the following applications are also possible thanks to zwickiLine+:
  • Fully automatic Vickers and Rockwell hardness traverse tests (Jominy end-quench test, Vickers tests on ceramics)
  • Ball indentation on plastics
  • Cyclic tests on paper or ceramics
  • Materials testing in general (e.g. tensile/compression tests)

Video of ZHU/zwickiLine in Action

1:38

ZHU/zwickiLine universal hardness tester

The ZHU/Z2.5 is the most flexible, most versatile hardness testing machine in the world. Its hardness measurement head is integrated in the zwickiLine testing machine.

Technical Overview

Härte-Prüfmaschine zwickiLine+

zwickiLine+ hardness testing machines with testControl II

Type

Z2.5 TN+

Item No.

1044260

Test load Fmax

2.5

kN

Test area

Test area height[1]

675

mm

Test area depth

105

mm

Test area width

No limitation

Load frame

Height

1289

mm

Width

585

mm

Depth

707

mm

Weight, approx.[2]

132

kg

Paint finish

A6-C31, RAL 7021 und RAL 3038

Ambient temperature

+10 ... +35

°C

Relative humidity (non-condensing)

20 ... 90

%

Average noise level at vmax measured in 1 m distance to the front side of machine

64

dB(A)

Conformity

ISO 9000 and CE

Drive

Driving power

500

W

Power consumption

2.3

kVA

Motor

DC servo motor

Control, set value preselection

Digital

Crosshead speed vmin ... vmax

0.0005 to 3000

mm/min

Drive travel resolution

0.95

nm

Positioning repeat accuracy at the crosshead (without direction reversal)

±2

μm

Controller

Adaptive

Cycle time

1000

Hz

Power input specifications

Version

1

kW

Power supply

230

V

Phases

1Ph/N/E

Permissible voltage fluctuation

±10

%

Power consumption (full load), approx.

2.3

kVA

Power frequency

50/60

Hz

  1. Inclusive add-on unit "Optics". The dimensions of the x-y tables are not considered.
  1. based on typical accessories

Measuring head up to 2.5 kN

Description

Value

Item No.

1044204

Resolution

0.002

μm

Test load, max. (Fmax)

2.5

kN

Upper connection

Ø 20

mm

Lower compression platen

Ø 138

mm

Load cell

0.005 ... 2.5

kN

Extensometer, digital

max. 4 mm, increased resolution 0.002 μm

Measuring head up to 200 N

Description

Value

Item No.

1044205

Resolution

0.002

μm

Test load, max. (Fmax)

0.2

kN

Upper connection

Ø 20

mm

Lower compression platen

Ø 138

mm

Load cell

0.002 ... 0.2

kN

Extensometer, digital

max. 4 mm, increased resolution 0.002 μm

Optical unit

"Optics" add-on unit for hardness measuring head

Description

Item number

"Optics" add-on unit in conjunction with hardness measuring head (testControl II), including manual displacement unit for installation in a zwickiLine+ hardness testing machine. Includes 1.4-megapixel GigE camera, LED illumination and software licenses.

1044206

Required:

objective lenses

see below

power supply unit for LED illumination

375922

powerful graphics card for optical hardness test methods[1]

075270

"Optics" add-on unit in conjunction with hardness measuring head (testControl II), including motorized displacement unit for installation in a zwickiLine+ hardness testing machine. Includes 1.4-megapixel GigE camera, LED illumination and software licenses.

1044207

Required:

objective lenses

see below

power supply unit for LED illumination

375922

powerful graphics card for optical hardness test methods[1]

075270

motorized X-Y table

see above

Video adapter (interchangeable; option for "Optics" add-on unit) with low individual magnification for connecting the GigE camera to hardness measuring microscopes. The field of view shown on the screen is expanded by a factor of approximately 2.

320406

  1. Compatibility of the PC card is guaranteed only in conjunction with PCs from Zwick's range with Windows 10. In the case of use of customer's own PC, this must be sent to Zwick in the event of an order.

Lenses

Item no.

311954

311956

311958

311960

311962

Inherent magnification

5 : 1

10 : 1

20 : 1

40 : 1

60 : 1

Horizontal field of view, max., standard version

1760

880

440

220

147

μm[1] [2]

Vertical field of view, max., standard version

1320

660

330

165

110

μm[1] [2]

Resolution, standard version

1.5

0.8

0.4

0.2

0.13

μm/pixels

Horizontal field of view, max., optional version (item no. 320406)

2720

1360

680

340

μm[3] [4]

Vertical field of view, max., optional version (item no. 320406)

2040

1020

510

255

μm[3] [4]

Resolution, optional version

2.3

1.2

0.6

0.3

0.2

μm/pixels

  1. A video adapter with a high level of inherent magnification is integrated in the standard version in the measurement microscope in front of the GigE camera.
  1. The permissible measurement ranges are described in detail in the corresponding standards. For example, according to DIN EN ISO 6507-2, in order to achieve a resolution of 0.2 μm (d < 40 μm) or 0.5% of d (d ³40 μm), a Vickers indentation must equal at least 1/3 of the vertical field of view.
  1. In the optional version an interchangeable video adapter with a low level of inherent magnification can be integrated in the measurement microscope in front of the GigE camera. In contrast to the standard version, it expands the field of view. This is absolutely necessary for the Brinell hardness test.
  1. According to DIN EN ISO 6506-1/2, select the degree of load so that 0.24 · D < indentation diameter < 0.6 · D. The remaining indentation diameter is thus within the following limits:
    1-mm ball: 0.240 mm < indentation diameter < 0.6 mm
    2.5-mm ball: 0.6 mm < indentation diameter < 1.5 mm
    5-mm ball: 1.2 mm < indentation diameter < 3 mm
    The measurement device should have a scale of 0.5% of d.
Top