Non-Destructive Hardness Testing System Of Ferromagnetic Material

Hardness Test of special parts is gradually increased in the present tendency. Hardness measurement requirements higher and the face of parts need more stringent requirements. There would be some question when those parts are tested use RBI method. To resolve this contradiction that components would be damaged more with RBI method and not comprehensive with accident more easily to come. We must detect the hardness value without damage surface of the parts and components. Electromagnetic measurement method has many advantages, such as 100% non-contact detection, without any coupling agent, and fast detection speed, so it can be widely used in hardness testing.Based on the corresponding relationships between hardness and coercively of surface of ferromagnetic materials that has being heat treated. System includes the design of sensors Probe head, design of the system control circuit, as well as single-chip control procedures, the computer interface and data-processing algorithm in three parts. Probe the entire system are the basis of the work, deal with some of the circuit are part of this article focuses on the main introduction of the magnetization of the control circuit reverse magnetization, B and comparison of signal detection circuit, single-chip control circuit, LCD display circuit, power circuit. One of the reverse magnetization signal detection circuit and B are the focus. Part of operating software can be easily measured by data-processing part of the request came to the conclusion that the hardness value.