METHOD AND APPARATUS FOR MEASURING SURFACE-HARDENED LAYER DEPTH OF WORKPIECE

摘要

Detecting coil (28) is supported on a support member (24) having a distal end portion (36) tapering toward a workpiece to be measured. Thus, the detecting coil (28) can be readily moved close to the surface of the workpiece (15; 59). Memory (50) has prestored therein a table containing surface -hardened layer depths determined in advance in association with different possible electric voltages produced in the workpiece. Surface-hardened layer depth at a local position of the workpiece can be determined by reference to the table in accordance with an electrical voltage detected via the signal detection section.