The Leeb hardness tester is an essential tool used to ensure product quality and conduct failure analysis. Choosing the right Leeb hardness tester is crucial for users, as it directly impacts the accuracy of their measurements and the reliability of their results.
1. **Imported or Domestic Leeb Hardness Tester?**
Swiss PROCEQ introduced the Leeb hardness tester in 1977, setting a global benchmark for performance and precision. Many countries, including China, have adopted PROCEQ’s technical standards as national measurement guidelines. One of the key advantages of PROCEQ’s devices is that a single main unit can be paired with up to seven different impact devices, offering great versatility. However, imported models tend to be more expensive—often costing around RMB 80,000 for a basic D-type configuration—and may present challenges in terms of maintenance and repair. In contrast, domestic models are more affordable, typically priced around RMB 10,000 for similar configurations. While they offer cost savings, buyers must carefully evaluate the quality and reliability of domestic options before making a purchase.
2. **How to Identify the Strengths and Weaknesses of a Leeb Hardness Tester?**
A genuine Leeb hardness tester adheres to both national and international standards, ensuring consistency and interchangeability. However, not all manufacturers meet these requirements. Some produce devices that fall short of the true standard, even if they pass basic calibration. To identify a reliable model, look for the following features:
- Interchangeable impact devices: A high-quality main unit should support multiple types of impact devices.
- Replaceable hammers: The punch on the impact device should be easily replaceable without affecting test results.
- No adjustable settings: Once manufactured, the device should not require user adjustments. If accuracy is compromised, it should be resolved by replacing worn parts.
- Consistent error margins: The measurement error should remain within acceptable limits across the entire hardness range.
3. **How to Choose the Right Leeb Hardness Tester for Your Needs?**
Understanding your testing requirements is key. Consider factors such as the size, thickness, surface finish, and material of the workpiece. Different materials, like aluminum, copper, or tool steel, have varying rebound moduli, which affect the test results. Selecting the appropriate impact device is critical for accurate readings. Additionally, determine which hardness scale you need—HL, HB, HRC, HRB, HV, HS—so you can choose a model that supports those measurements efficiently.
4. **Calibration of the Leeb Hardness Tester**
Due to its portability, ease of use, and speed, the Leeb hardness tester has gained widespread adoption. However, because it's a relatively newer method compared to traditional techniques like Brinell, Rockwell, or Vickers, many users still rely on converting Leeb hardness values to these more familiar scales. This conversion depends on the type of impact device used and the material being tested. Establishing accurate conversion tables requires extensive testing and is often handled by the manufacturer. It’s important to ensure that your device provides reliable conversion data based on accepted standards.
5. **Standards for the Leeb Hardness Tester**
Several national and industry standards govern the use and performance of Leeb hardness testers. These include:
- **ZBN71010-90**: An industry standard specifying technical conditions, testing methods, and inspection rules.
- **JJG747-1999**: A national metrological verification procedure outlining test principles and conversion values.
- **GB/T17394-1998**: A national standard detailing the methodology for metal hardness testing.
- **GB/T1172-1999**: A standard listing hardness-to-strength conversion values for ferrous metals.
These standards ensure that Leeb hardness testers meet rigorous performance and accuracy requirements. In 1984, Time Testing Instruments developed the first Leeb hardness tester in China, and over the past two decades, these devices have been widely used across various industries. Conversion data provided to users aligns with either national or international standards, depending on location.
small round coffee table,square coffee table,round coffee table,couch arm table,ikea vanity table,wooden shelving units,menards bathroom vanity
Famous Home Living(Dongguan)Co.,ltd , https://www.famoushomeliving.com