Hardness is a technical term in physics, which refers to the ability of a material to resist local hard objects pressing into its surface. There are many methods to test hardness, such as Brinell, Rockwell, Vickers and so on. The method of Brinell hardness test is to press a hardened steel ball or cemented carbide ball with a certain diameter into the tested metal surface with a certain test load, hold the pressure for a period of time, and then remove the load to obtain the indentation. Read the diameter of the indentation with a reading microscope, and check the Brinell hardness table to get the Brinell hardness value. The most common test standard in industrial production is a steel ball head with a diameter of 10mm, with a load force of 3000kgf and a holding time of 15s. The standard measurement of PHB-3000 hydraulic Brinell hardness tester produced by Shenyang TX Testing Instruments Inc is carried out by using 3000kg force and 10mm ball (the instrument is also equipped with 5mm cemented carbide ball to meet the special measurement requirements). In order to ensure the measurement requirement of 15s of applied force required by Brinell hardness, in actual measurement, repeated applied force of PHB-3000 is used for 3~5 times, which is equivalent to the requirement of 15s of applied force in Brinell hardness test method. This instrument conforms to the American standard ASTM E11 "Test Method for Measuring Hardness of Metal Materials by Portable Hardness Tester".
The surface area of the spherical indentation obtained by the 10mm steel ball and 3000kg load force used in the Brinell hardness tester measurement is large, which makes the test result have a good overall representation, and will not be affected by the individual structure of the measured workpiece. The measured value has high accuracy and its error is small. Originally, Brinell hardness tester is mostly large-scale equipment in laboratory, which can't detect on-site workpieces.
PHB-3000 hydraulic Brinell hardness tester produced by Shenyang TX Testing Instruments Inc is a portable hardness tester, which weighs less than 14kg, is easy to operate and easy to carry, and can go to the workshop to measure large, assembled, inconvenient to move and uncut workpieces. The instrument is tested according to the real Brinell hardness test principle, which is the same as the desktop principle in the laboratory. The calibration accuracy of the test force is 0.5% of the load, and the hardness test accuracy is the same as that of the desktop. Moreover, the PHB-3000 instrument can adopt a variety of test forces and select a variety of ball indenters, which makes its test range very wide, and the measurement range can reach 16~650HBW, which can well meet the requirements of measuring Brinell hardness of most common metals.