洛氏硬度中hra、hrb、hrc的区别（The difference between the Rockwell hardness of HRA, HRB, HRC）.docVIP

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洛氏硬度中hra、hrb、hrc的区别（The difference between the Rockwell hardness of HRA, HRB, HRC）.doc

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洛氏硬度中hra、hrb、hrc的区别（The difference between the Rockwell hardness of HRA, HRB, HRC）

洛氏硬度中hra、hrb、hrc的区别（The difference between the Rockwell hardness of HRA, HRB, HRC） The difference of HRA, HRB and HRC in Rockwell hardness According to the degree of hardness, the use of different measuring methods to measure the value, according to some standard finishing, for reference, please read the detailed standards The Brinell hardness (HB) at a certain load (usually 3000kg) to a certain size (diameter is 10mm) hardened steel ball is pressed into the surface of the material, for a period of time, to load, load ratio and area of indentation, the Brinell hardness value (HB), mm2 (kg / unit N/mm2). The Rockwell hardness (HR) or when the HB450 sample is too small, can not use the Brinell hardness test to Rockwell hardness measurement. It is a diamond cone with a vertex angle of 120 degrees or a ball with a diameter of 1.59 and 3.18mm. It is pressed into the surface of the tested material under certain loads. The hardness of the material is determined by the depth of the indentation. According to the hardness of the test material, three different scales are used to represent the hardness: There are three methods of measuring Rockwell hardness: 1) HRA, with a diamond indenter, measures 60 kilograms of load; 2) HRC, load 150 kg measurements; 3) HRB, with a 1/16 inch steel ball head, load 100 kg measurement value The hardness of Vivtorinox (HV) to load and angle of 120kg within the diamond square cone of 136 degrees pressing device is pressed into the surface of material, product divided by the load value of surface material of the indentation pit, which is Vivtorinox hardness value (HV) The difference of HRA, HRB and HRC in Rockwell hardness Rockwell hardness, HRA, HRB, HRC and other A, B, C, for three different standards, known as the scale A, ruler B, ruler C. Rockwell hardness test is one of several ordinary indentation hardness tests used nowadays. The initial pressures of three kinds of scales are 98.07N (10kgf). Finally, the hardness values are calculated acc