лер-UDю
COMBINED PORTABLE HARDNESS TESTER

Hardness tester warranty - 2 years

The hardness tester is a portable device consisting of an electronic module and two changeable probes: ultrasonic and dynamic.

The electronic module is located in an aluminum dust-proof-and-moisture-proof body of IP 66 protection index.

The hardness tester is equipped with an ultrasonic probe U15 (with the load of 1,5 kgf) or U50 (with the load of 5 kgf) and a dynamic probe D. Hardness testers can be equipped with an ultrasonic probe U10 and short probes U15Sh, U50Sh and DSh.

The characteristics of all probes are listed in the Table.

Probe name Probe description Probe clamping force, N (kgf)
U10 Ultrasonic 9,8 (1)
U15 Ultrasonic 14,7 (1,5)
U50 Ultrasonic 49,0 (5)
U100 Ultrasonic 98,0 (10)
U15Sh Ultrasonic short 14,7 (1,5)
U50Sh Ultrasonic short 49,0 (5)
D Dynamic -
DSh Dynamic short -

Distinctive features

Operates according to ultrasonic contact impedance method (UCI) at the connection of an ultrasonic probe according to the standards ASTM A 1038, DIN 50159, and rebound (Leeb) method at the connection of a dynamic probe according to the standards ASTM A 956, DIN 50156.

  • Combination of both methods enables to perform hardness control of all metal articles;
  • 2 changeable probes: ultrasonic and dynamic;
  • No limitations during hardness control (on mass, configuration, structure and degree of mechanical and thermal treatment, etc.);
  • Allows to estimate the change in hardness of a hardened layer along the depth of the article and the influence of surface tension;
  • Operates according to ultrasonic contact impedance method at the connection of an ultrasonic probe and according to rebound effect at the connection of a dynamic probe;
  • Two hardness testers in one - it is convenient and profitable:
    cost of лер-UD = [cost of (лер-U1) + cost of (лер-D1)] - 25%.

UCI-method enables to control the hardness of metal and alloy items of any weight and dimensions, but is mostly suitable for measurements on the surface of thin and light articles with homogeneous structure that cannot be measured using the dynamic rebound method (Leeb).

The rebound (Leeb) method is very simple, productive and does not require any special experience. It is particularly suitable for hardness measurements on massive articles, materials with coarse-grained structure, forged and cast articles.

Main possibilities

Portable Combined Hardness Tester MET-UD
Aluminium body

  • Measurement of metal and alloy hardness according to standardized hardness scales: Rockwell (HRC), Brinell (HB), Vickers (HV) and Shore (HSD);
  • Availability of three additional scales H1 (HL), H2, H3 for calibration of various hardness scales (for example, Rockwell B, Super-Rockwell, Brinell (HBW), etc.) for hardness control of steel and other metals (for example, aluminum alloys, copper, etc.);
  • Use of Rm (MPa) scale for determination of tensile strength (for pearlitic class steels according to GOST 23761);
  • Possibility of hardness control of items that are inaccessible for stationary hardness testers due to their dimensions;
  • Hardness measurements of articles of any mass and thickness starting from 1 mm (metal coatings, small parts, thin-walled structures, pipes, reservoirs, steel sheets, etc.);
  • Does not leave any visible indent on the tested article surface (crankshafts necks, mirror surfaces, knives);
  • Availability of archive and software for PC connection.

OPERATION PRINCIPLE

The UCI-probe basically uses a steel rod with Vickers diamond pyramid (136-degree angle between facets), which is an acoustic resonator of the inbuilt generator of ultrasonic frequency. At the penetration of the pyramid into the tested article, under the effect of the calibrated spring force there occurs a change in the resonator natural frequency determined by the material hardness. The relative change in the resonator frequency is transformed by the electronic module into the hardness value of the chosen scale and is indicated on the display.

The hammer pin located in the dynamic probe is equipped at its end with a hard-alloy ball, which is in direct contact with the controlled surface at the moment of the impact. Inside the pin there is a permanent magnet. When the release button is pressed, the pin is thrown onto the tested surface with the help of the previously retracted spring. At that the pin moves inside the induction coil and with its magnetic field creates an electromotive force. The signal from the coil output is sent to the electronic module input, where it is converted into a hardness value of the selected scale and is indicated on the display.


Step-by-step demonstration of the hardness tester functioning:


Step-by-step demonstration of the hardness tester functioning:

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