This paper describes the influence of NaCl-electrolyzed water on fluorophosphate glass. First, the etching characteristics of NaCl-electrolyzed water against the test piece surface were clarified by immersion experiments. The results showed that NaCl-electrolyzed oxidizing water had superior etching efficiency, but the surface became rough. With short immersion processing time, NaCl-electrolyzed reducing water had no influence on the micro-scale shape of the test piece surface. Next, washing experiments were performed to examine the washing efficiency of NaCl-electrolyzed reducing water. The results indicated that NaCl-electrolyzed reducing water had an excellent cleaning effect comparable to the control solution. The results of this study suggested that NaCl-electrolyzed reducing water could be applied to the surface wash processing of fluorophosphate glass.

Severe tool wear and breakage occur in drilling of cemented carbide by grinding. To resolve these problems, it is necessary to suppress the sharp increase in grinding force. Here, we propose drilling of cemented carbide by ultrasonic vibration-assisted grinding on a flexible stage to hold the workpiece and prevent the rapid increase in grinding force. The flexible stage is supported by springs and can fluctuate in the axial direction of the tool depending on the grinding force. This method achieved near-constant pressure machining, and suppressed tool wear through stabilization of the grinding force.

The magnetic field-assisted machining process is expected to be a useful post-processing technique. For surface treatment, residual stress is known to exert an influence on fatigue strength and stress corrosion cracking, and techniques to increase compressive residual stress on the processing surface and pipe inner face are required. Here, the magnetic field-assisted machining process using electrolyzed reducing water was shown to increase compressive residual stress compared to the use of the traditional approach using metalworking fluid. This study was performed to examine the basic working characteristics of the new technique that increases compressive residual stress using the magnetic field-assisted machining process with electrolyzed reducing water. Furthermore, we developed a magnetic pole incline processing method to increase compressive residual stress values and applied this method to internal processing. The results demonstrated the usability of this processing method.