Quality control of hardness testing machine starts from materials - Sanfeng hardness testing machine

hardlinear measureIt measures the ability of a material to resist local deformation, especially plastic deformation, indentation, or scratches.Usually, the harder the material, the better its wear resistance, for exampleGears, etcMechanical components will require a certain degree of hardness to ensure sufficient wear resistance and service life.

rockwellHardness (symbol)HR）Before measuring the Rockwell surface hardness, a diamond indenter (tip cone angle: 120 °, tip radius: 0.2mm) or a spherical indenter (steel ball or hard alloy ball) should be used to apply a preload force to the standard specimen, followed by applying a test force and restoring the preload force.

The hardness value is obtained from the hardness formula, which is expressed as the difference in indentation depth h (μ m) between the preload force and the test force. The Rockwell hardness test uses a preload force of 98.07N, while the Rockwell surface hardness test uses a preload force of 29.42N. The specific symbol provided in conjunction with the type of indenter, test force, and hardness formula is called a ruler. The Japanese Industrial Standards (JIS) define various related hardness scales.