Development of electric rust preventive machining method

–Proposal for a machining water recycling system–

Abstract

As machining fluid contains oil, extreme pressure agents, surface active agents, etc., effluent treatment of waste fluid is necessary, such as incineration or coagulative precipitation. Therefore, it is necessary to reduce the amounts of machining fluid used to lessen environmental load and minimize disposal costs. In this investigation, an electric rust preventive machining method that uses only water as machining fluid was developed. A water recycling system was developed and verified. This system consists of 2 parts. First, an electric rust preventive chip sedimentation system, which separates chips, achieves 72 h rust prevention of chips in water. Second, a water reproducing system, which uses a reverse osmosis membrane, removes minute chips and ions and purifies the used water.