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(一)砂轮用户最关心的问题是如何正确地挑选砂轮,以得到更好的磨削效果,其中最主要的参数就是砂轮的“硬度”。人们常有这样的经验:当发现一只合适的砂轮之后,想再得到同样的砂轮却很困难。为此,早在二十年代初,欧美各国一直致力于砂轮“硬度”测试方法的研究。到目前为止,据不完全统计,各种测定方法和装置已超过28种。其中,随着电子技术的发展,在六十年代末期出现的“数字音频硬度计”目前已引起普通重视。决定磨削效果的参数很多,除磨削条件,如:切
(A) The most concerned about the user of the wheel is how to correctly select the wheel, in order to get a better grinding effect, the most important parameter is the “hardness” of the wheel. People often have the experience that when a suitable wheel is found, it is difficult to get the same wheel again. To this end, as early as the early 1920s, Europe and the United States has been committed to grinding wheel “hardness” test methods. So far, according to incomplete statistics, a variety of measurement methods and devices have been more than 28 kinds. Among them, with the development of electronic technology, “Digital Audio Hardness Tester” appeared in the late sixties has now caused the common attention. Many parameters determine the grinding effect, except for grinding conditions, such as: cut