DYNAMIC PORTABLE HARDNESS TESTER
The hardness tester is a portable device consisting of an electronic module and a probe connected by a cable.
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 a dynamic probe D.
Hardness testers can be equipped with short probes DSh.The characteristics of all probes are listed in the Table.
|Probe name||Probe description|
Distinctive featuresOperates according to rebound (Leeb) method (ASTM A 956, DIN 50156). The rebound 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.
- 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, Leeb (HL), Rockwell B, Super-Rockwell, Brinell (HBW), etc.) for hardness control of steel and other metals (for example, cast iron, aluminum, 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;
- Availability of archive and software for PC connection.
Hardness measurements are based on the determination of the speed ratio of the hammer pin before and after the impact. At its end the pin is equipped 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.
The measurement of articles weighing less than 3 kg and thinner than 12 mm is possible only when the following conditions are fulfilled:
- Availability of a cast iron or steel base plate weighing no less than 3 kg;
- Availability of lapping fluid for better contact of the article with the base plate;
- The article should be SOLIDLY lapped to the base plate surface.
Step-by-step demonstration of the hardness tester functioning:
rebound method, Leeb method