The Brinell hardness testers manufactured by TX company apply Brinell hardness testing principle, with 6 kinds of test forces for choosing, they are:
Test range can be from 32 HBW to 650 HBW. Test force error and indication error which comply with ISO and ASTM standards are less than 1% except the pin impact Brinell hardness tester being less than 5%.
As the light weight and being convenient to take, Brinell hardness tester is a portable instrument that can be used in the workshop. It is easy to operate and carry. It can realize the detection of large parts by piece. The portable Brinell hardness testers are widely used on site to test the metal hardness without taking samples.
Ms-1a Brinell Indentation Measurement System manual pdf:http://www.txinstruments.com/support/users-manual-download/ms-1-brinell-indentation-measurement-system-users-.pdf
The choice of Brinell hardness test conditions is the same with the choice on scale of Rockwell hardness test. Brinell hardness test also encountered the choice of test conditions, that is the choice of test force F and pressure ball diameter D. This choice is not arbitrary, but to follow certain rules and pay attention to the reasonable match of the test force and pressure ball diameter. Therefore, its application is slightly complex than Rockwell hardness test.Hardness is a measure of the softness of the material. There are many different hardness test methods whose principle are definitely different, measured hardness values and meaning are not exactly the same. Brinell hardness(HB), Rockwell hardness(HRA, HRB, HRC), Vickers hardness (HV), rubber and plastic Shore hardness (HA, HD), etc. are the most common static load press hardness tests of which the value of the material show its surface ability to resistant the press of hard objects. Therefore, the hardness is not a simple physical quantity, it reflects a comprehensive performance including elasticity, plasticity, strength and toughness of the material.
Besides, it is also used to test parts which is too large for desk testers to test. It will replace Leeb hardness testers with low accuracy and reliability. The hardness test is very accurate, especially for the softer metals. Brinell hardness tester mainly used for the detection of raw materials and semi-finished products. Due to large indentation, it is not used for finished product testing generally.Hammer Impact Brinell Hardness Tester Application:
In the actual testing, many factors would effect the accuracy of the test results, including the following aspects:
1. Whether the Test Force of Instrument is Accurate
If the test force increases, the test result will be lower. Otherwise the test result will be higher. This means that the accuracy of the applied test force will directly effect the test result. The test head of PHB-3000 hydraulic Brinell hardness tester of Shenyang Tianxing applies a small hydraulic system, with a control valve in it. The hydraulic system which is accurately calibrated to 3000kgf is specifically applied to control the test force. The control accuracy of this product reaches the level of foreign advanced instrument.
2. Effect of the Ball IndenterThe diameter of ball indenter has direct relationship with the test result. If the diameter of ball indenter increases, the relevant hardness value will be lower. Otherwise, the hardness value will be higher. Besides, there is exact requirement of the material of ball indenter. If the material of ball indenter is not hard enough, in the actual testing,elastic and plastic deformation will happen on the ball indenter, effecting the test result greatly. The PHB-3000 of Tianxing company applies a ball indenter with carbide alloy material and 10mm diameter with high accuracy and quality, ensuring the accuracy of test result.
3. Inaccurate Testing of Indentation Diameter
Brinell hardness value is got from conversion table according to indentation diameter. Reading the indentation diameter correctly has great influence with test result. The Brinell hardness tester of Tianxing company assembles professional reading microscope to accurately read the diameter of indentation.
4. Effect of Specimen Quality
The roughness, thickness, and curvature will all effect the test error. In general, the more rough the surface is, the smaller the hardness value will be. Being not thick enough will lead to a lower hardness value. At this time, users will notice to calibrate the test result.
5. Effect of Environment Temperature
If the environment temperature of specimen changes, the material organization structure of specimen will change. The organization structure will effect the result of Brinell hardness testing greatly. The increasing of environment temperature will lower the hardness value. Therefore, in the actual testing, people should consider the change of environment temperature, making test result more accurate.
TM E10-14 Standard Test Method for Brinell Hardness of Metallic Materials
ISO 6506-2:2014 Metallic Materials- Brinell Hardness Test-Part 2: Verification and Calibration of Hardness Testing Machines