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一、测试原理在手锤冲击力(不定值)的作用下,标准硬度块和试件所受的力相等,使直径10毫米的钢球同时压入标准硬度块和被测试件的表面,如图1所示。标准硬度块和试件由于硬度不同,所得的压痕直径也就不同,把二者的压痕直径测出后,按其平方比值乘以标准块的硬度值,便得欲求的试件硬度。即: H_b·d~(2_d)/d~(2_s)=HB(或HRC) (1)式中, H_b——标准硬度块的硬度,为布氏HB 注:式中脚注b和s分别为标准硬度块和试件的第一个拼音字母。标准硬度块压痕直径平方与试件压痕直径平方的比值也等于压痕面积的比值,d~2_b/d~2_s=F_b/F_(?)=K。二、测试方法 1.将标准硬度块插入仪器下套筒的钢球
First, the test principle Hammer impact (indefinite value) under the action of the standard hardness block and the specimen subjected to the same force so that the diameter of 10 mm at the same time the ball into the standard hardness block and the surface of the test piece, As shown in Figure 1. The standard hardness block and the specimen due to different hardness, the resulting indentation diameter will be different, the two indentation diameter measured, according to the square ratio multiplied by the standard block hardness value, will have the desired hardness of the specimen. That is: H_bd ~ (2_d) / d ~ (2_s) = HB (or HRC) (1) Wherein, H_b-- hardness of the standard hardness block, Brinell HB Note: Wherein footnote b and s Standard hardness block and the first pinyin letter. The ratio of the square of indentation diameter to the square of indentation diameter of standard specimen is also equal to the ratio of indentation area, d ~ 2_b / d ~ 2_s = F_b / F _ (?) = K. Second, the test method 1. The standard hardness block inserted into the instrument under the sleeve of the ball