Hardness testing is a fundamental method used to determine the resistance of a material to permanent deformation. It can be categorized based on the testing method: scratch hardness, indentation hardness, and rebound hardness. Among these, indentation hardness testing is widely considered more accurate and is commonly used in modern applications. This type of testing includes various techniques such as static pressure methods (e.g., Brinell, Rockwell, Vickers), scratch methods (e.g., Mohs scale), and rebound methods (e.g., Shore hardness). Additionally, there are specialized types like microhardness testing and high-temperature hardness testing.
Each hardness tester uses a specific indenter, and indenters can be classified based on their function and specifications. There are two main types: standard indenters and working indenters. A standard indenter is used for calibrating standard hardness blocks according to national verification regulations, while a working indenter is used for routine testing under the same standards. Proper selection and maintenance of the correct indenter are essential for accurate results.
To ensure the longevity and accuracy of your hardness tester, follow these maintenance tips:
- Always power off the device before performing any adjustments or inspections, such as loading/unloading weights, removing the upper cover, plugging/unplugging cables, or opening the side door.
- When transporting the hardness tester, remove the weight and indenter or secure them with a rope. Place an anti-vibration rubber pad between the pressure head seat and the sample table. For long-distance transport, always return the device to its original packaging.
- Handle the loading and unloading head with care to avoid damaging the tip or contaminating it. Ensure that the mounting surface is clean and free from debris. Avoid removing the indenter for extended periods, and take precautions against rust.
- Place the sample securely on the testing platform, ensuring it is stable and will not shift or deform during the test.
- Regularly lubricate the sample table lifting screw. To do this, remove the sample stage and protective ring, loosen the screw housing, apply a few drops of light oil to the screw, and turn the hand wheel to evenly distribute the lubricant. Reinstall the housing and other components carefully. Do not over-lubricate, as excess oil can interfere with performance.
Following these guidelines will help maintain the precision and reliability of your hardness testing equipment, ensuring consistent and accurate results over time.
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