Calibration Method of Hardness for Ball Indenter of Rockwell Hardness Tester
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 hard-ware,the mold for fixing ball indenter of Rockwell hardness tester is made by precise machining and selecting suitable ma-terials 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 con-vex sphere is edited with the formulas in the WPS table so that operation process of data processing is simplified.As a re-sult,the calibration of hardness for ball indenter could be carried out so that the work efficiency and test accuracy could be improved.
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