洛氏硬度计球压头硬度的检定方法

Calibration Method of Hardness for Ball Indenter of Rockwell Hardness Tester

洛氏硬度计的球压头硬度作为洛氏硬度计的检定项目,需用维氏硬度计进行检定。由于球压头较小,在光滑的试验台上不能固定,无法开展检定,而且检定后需要查阅修正系数表,通过内插法才能求出相应的结果,降低了工作效率。在硬件方面通过精密的机床加工,选择合适的材料制作出固定洛氏硬度计球压头的模具,保证固定球压头的稳定性。在软件方面根据修正系数表的数据做线性回归,得到修正值的拟合方程,再利用WPS表格中的公式编辑出凸球面硬度修正表格,简化了数据处理的操作流程。从而可以开展球压头硬度检定,提高了工作效率和试验精度。

As the calibration item of Rockwell hardness tester,hardness of ball indenter for Rockwell hardness tester needs to be calibrated by Vickers hardness tester.Due to ball indenter is smaller,it cannot be fixed on smooth test bed so that calibration cannot be carried out.Moreover,it is needed to refer to correction coefficient table after calibration,the corresponding results can only be obtained through interpolation method so that work efficiency is reduced.In terms of hardware,the mold for fixing ball indenter of Rockwell hardness tester is made by precise machining and selecting suitable materials to ensure the stability of ball indenter.In terms of software,the linear regression is performed based on the data in correction coefficient table to obtain fitted equation of correction values.Moreover,the correction table for hardness of convex sphere is edited with the formulas in the WPS table so that operation process of data processing is simplified.As a result,the calibration of hardness for ball indenter could be carried out so that the work efficiency and test accuracy could be improved.