The instrument adopts circuit type sensor added with the control system, thus with high precision, high repetition, and reliability, and easy operation. This Brinell hardness tester is applied in testing the hardness of metal materials with big grains using heavy testing forces.
These materials include nonferrous metals, castings, and soft metals like tin and aluminum. The TBH07 digital brinell hardness tester has a broader range of hardness testing abilities than its predecessors. It has applications that include testing hard and brittle materials like plastics along with nonferrous and soft metals or alloys.
The Brinell hardness test method follows ASTM E10 standards to inspect the materials whose structure is too coarse or having a rough surface that can be tested using another method such as castings and forgings. This test often uses a very high test load kgf as well as a 10mm diameter indenter where the resultant indentation averages out most of the surface and sub-surface inconsistencies.
The Brinell method employs a predetermined test load F to a carbide ball of static diameter D held for predetermined time duration and then removed. The resultant impression is determined using a specifically designed Brinell microscope or optical system across a minimum of two diameters especially at right angles to each other, and then these results are averaged d.
Though the below mentioned calculation can be used to derive the Brinell number, a chart is often required to change these averaged diameter measurements to a Brinell hardness number. The common test forces vary from kgf often applied for non-ferrous materials to kgf used for cast iron and steels. There are other Brinell scales available with a load as low as 1kgf as well as 1mm diameter indenters, however, these are used infrequently nowadays. Usually, the major source of error in Brinell testing is the determination of the indentation.
Due to discrepancies among the operators, while deriving the measurements, the outcomes may differ even under ideal conditions. Less than ideal conditions can lead to an increase in significant variation. The test surface is frequently prepared using a grinder to eliminate surface conditions.
The pointed edge makes it difficult to interpret the indentation. We have 25 years of experience in the professional production of hardness testing devices, an annual output of more than 10, hardness testers. As of September , we have a total of employees, including nearly 35 professional and technical workers who are masters or doctorate degree holders.
We have Complete machining workshop, CNC, CNC machine tools, and more than 50 other types of processing equipment,to ensure high-precision product parts. We provided excellent after-sales service, including fast delivery, online training, immediate feedback of trouble shotting. Brinell hardness testers can be used to inspect the hardness of non-homogeneous materials the materials where the properties are not persistent throughout the specimen.
This non-destructive testing works by using varied forces as well as different indenters. Brinell hardness testers follow US, European, and International standards:. The Brinell hardness testing machine presses a tungsten carbide ball into the sample, and optically measures the diameter of the impression. This instrument is performed using a Brinell hardness test unit. The other parameters of the Brinell machine include the following features:. Loads: From 1 kgf to kgf.
Indenter sizes: 1, 2. Maximum hardness: HBW. There are two types of technological remedies to counter Brinell measurement error issues, which have been developed over the years. Automatic optical Brinell scopes, like the B. Brinell units work as per the ASTM E standards while measuring the samples using Brinell hardness parameters along with a Rockwell hardness method. This method delivers the most repetitive results with greater speed since the notions of optical interpretations are eliminated by using an automatic mechanical depth measurement.
However, in this method, the results may not be strictly consistent with Brinell results due to the application of varied test methods — a counterbalance to the outcomes may be required for some materials. It will be easier to establish the right values in those cases where this arises as an issue. The Brinell hardness test can be easily explained as an indentation hardness test, which consists of two basic steps:.
In practice, the formula is not calculated for every single test in order to determine the hardness value. Alternatively, the hardness value can be read from tables or specially programmed test software, which indicate the hardness value for all standardised ball diameters and test loads as a function of the average indent diameter d see poster "Hardness comparison table".
The test force must be selected such that the average indent diameter d is between 0. In order to adhere to these limits, the test force must be coordinated with the ball diameter. The five common force-diameter indexes are 1, 2. Testing of a material with different ball diameters and test forces must be conducted within the same force-diameter index in order to achieve comparable test results see overview table " Brinell methods and applications ".
The ball diameter must be selected in such a way that the indent covers the largest possible workpiece area — representative for the specimen. According to the standard ISO , the test load should be increased to its final value within a minimum of two to a maximum of eight seconds Generally, the dwell time for the test load is ten to 15 seconds s.
If the dwell time is any longer, the duration in seconds must also be specified in the hardness value, e. Enquiry basket. It is an ideal Brinell hardness test instrument for scientific research institutions, enterprises and quality inspection departments to conduct research and testing.
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