Corrosion preventing apparatus, corrosion preventing method, and wire electric discharge machining apparatus

A corrosion preventing method using a corrosion preventing apparatus which includes a water purifying part that includes a hydrogen-ion form resin and a hydroxy-ion form resin, an anticorrosive part that includes a cation form resin and an anion form resin having anticorrosive ions supported thereon;

• a conductivity measuring part that measures a measured value of conductivity of a machining liquid, and a control part that controls a flow of the machining liquid to the water purifying part and the anticorrosive part on the basis of the conductivity measuring part, the method characterized in that,
• on the basis of predetermined first and second conductivities and the measured value measured by the conductivity measuring part, the control part performs control such that the machining liquid flows into the water purifying part and the anticorrosive part until the measured value of the machining liquid reaches the first conductivity,
• if the measured value reaches the first conductivity, the control part performs control such that the flow of the machining liquid into the water purifying part stops and the machining liquid flows into only the anticorrosive part;
• and
• if the measured value increases up to the second conductivity, the control part performs control such that the flow of the machining liquid into the water purifying part restarts and the machining liquid flows into the water purifying part and the anticorrosive part.

A wire electric discharge machining apparatus in which a work piece and a wire electrode are separated from each other by a predetermined distance, and machining is performed by applying a voltage therebetween such that electric discharge is generated, the electric discharge machining apparatus comprising:

• a corrosion preventing mechanism comprising:
• a water purifying part that includes a hydrogen-ion form resin and a hydroxy-ion form resin,
• an anticorrosive part that includes a cation form resin and an anion form resin having anticorrosive ions supported thereon,
• a conductivity measuring part that measures a measured value of conductivity of a machining liquid, and
• a control part that controls a flow of the machining liquid to the water purifying part and the anticorrosive part on the basis of the conductivity measuring part,
• wherein, in the corrosion preventing mechanism, on the basis of predetermined first and second conductivities and the measured value measured by the conductivity measuring part, the control part performs control such that the machining liquid flows into the water purifying part and the anticorrosive part until the measured value of the machining liquid reaches the first conductivity,
• if the measured value reaches the first conductivity, the control part performs control such that the flow of the machining liquid into the water purifying part stops and the machining liquid flows into only the anticorrosive part, and
• if the measured value increases up to the second conductivity, the control part performs control such that the flow of the machining liquid into the water purifying part restarts and the machining liquid flows into the water purifying part and the anticorrosive part.