Surface property inspection device and surface property inspection method

摘要

To provide a surface property inspection device and surface property inspection method with which the surface treatment condition of treated material such as steel subjected to such surface treatments as shot-peening treatment or heat treatment, nitriding, and the like can be non-destructively and precisely inspected, and which offers a high degree of general purpose application. A surface property inspection device 1 includes an AC power supply, an AC bridge circuit, and a judgment device, and the AC bridge circuit has a variable resistor with a variable split ratio γ, a benchmark detector, and an inspection detector. In variable resistor setting step S1, the split ratio γ of a variable resistor is adjusted and set so that the output from the AC bridge circuit is increased; after setting a frequency at which the output from the AC bridge circuit is maximized using a frequency setting step S2, in pass/fail judgment step S4, a benchmark sample S is brought into contact with the benchmark detector, the sample under inspection M is brought into contact with the inspection detector, and the output from the LPF 33 and the threshold value set in the threshold value setting step S3 are compared and a pass/fail judgment is made of the surface condition of the sample under inspection M.

主权项

1. A surface property inspection device, comprising:
an AC bridge circuit; an AC power supply for supplying AC power to the AC bridge circuit; and a judgment device for making a pass/fail judgment of the surface treatment condition of a sample under inspection based on the output signal from the AC bridge circuit; wherein the AC bridge circuit includes a variable resistor constituted so that the split ratio between a first resistor and a second resistor is variable, a benchmark detector having a first magnetic sensor for detecting the magnetic properties of a benchmark sample in a good surface treatment condition, and an inspection detector having a second magnetic sensor for detecting the magnetic properties of a sample under inspection for which a pass/fail inspection of the surface treatment condition is to be made; and the first resistor, the second resistor, the benchmark detector, and the inspection detector constitute a bridge circuit; and wherein the judgment device judges the pass/fail status of the surface treatment condition of the sample under inspection based on the output signal from the AC bridge circuit in a state in which AC power is supplied to the AC bridge circuit, the first magnetic sensor detects the magnetic properties of the benchmark sample, and the second magnetic sensor detects the magnetic properties of the sample under inspection.