SURFACE PROPERTY INSPECTION METHOD AND SURFACE PROPERTY INSPECTION DEVICE

Title:

SURFACE PROPERTY INSPECTION METHOD AND SURFACE PROPERTY INSPECTION DEVICE

Document Type and Number:

WIPO Patent Application WO/2018/066171

Kind Code:

A1

Abstract:

The present invention provides a surface property inspection method by which the surface treatment state of a treated material on which surface treatment has been done by heat treatment such as carburizing and quenching or nitriding, or by shot peening treatment, can be more precisely inspected by increasing an output voltage. A resistance ratio setting step for setting the resistance ratio of a resistance R1 and a resistance R2 in an AC bridge circuit 20 of a surface property inspection device 1, comprises: a step for placing, in a reference detector 22 and an inspection detector 23, reference samples S on which no surface treatment has been done, and measuring a first setting output signal while changing a distribution ratio γ; a step for placing a reference sample S in the reference detector 22 and placing, in the inspection detector 23, a sample for setting on which surface treatment has been done, and measuring a second setting output signal while changing the resistance ratio; a step for calculating a difference value between the first setting output signal and the second setting output signal for each corresponding resistance ratio; and a step for setting a resistance ratio on the basis of the resistance ratio at which the absolute value of the difference value becomes maximum.

Inventors:

MAKINO YOSHIYASU (JP)

Application Number:

PCT/JP2017/020479

Publication Date:

April 12, 2018

Filing Date:

June 01, 2017

Export Citation:

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Assignee:

SINTOKOGIO LTD (JP)

International Classes:

G01N27/72

Foreign References:

JP2013529286A	2013-07-18
JPS557630A	1980-01-19
JPS60202355A	1985-10-12
US20140028302A1	2014-01-30

Other References: