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在作各种硬度试验时,载荷保持时间对硬度值有一定的影响。为了保证硬度试验结果的准确,各种硬度试验法和硬度块定度规程中对载荷保持时间作了统一的规定。而目前国内使用的许多硬度计(国产的和进口的)绝大多数没有控制载荷保持时间的机构。当使用这些硬度计作准确的硬度试验时(如标准硬度块定度等),载荷保持时间的控制极不方便。为了提高硬度试验的效率和保证硬度测定值的稳定、准确,我们装置了一个以时间继电器为主要构件的载荷保持时间控制器。该仪器自一九六五年以来一直用于洛、布、维氏硬度块的定度。实践证明它是有效、可靠的。
In a variety of hardness tests, the load holding time has a certain impact on the hardness value. In order to ensure the accuracy of the hardness test results, a variety of hardness test method and the hardness of the block size of the load-keeping time made a uniform regulation. At present, many of the durometers used in China (domestic and imported) do not have a mechanism to control the load holding time. When using these durometers for accurate hardness testing (such as standard hardness blocks, etc.), load-holding time control is extremely inconvenient. In order to improve the efficiency of the hardness test and ensure the stability and accuracy of the measured hardness, we have installed a load-holding time controller with the time relay as the main component. The instrument has been used since 1965 for Luo, cloth, Vickers hardness of the block. Practice has proved that it is effective and reliable.