ワイヤ放電加工のワイヤ温度分布計測の試み 第２報 加工中のワイヤ平均温度

Abstract

To prevent the wire breakage during Wire EDM there should be information of the wire temperature because it is said that the wire may be broken by increasing of wire temperature. In our previous report we tried to measure the wire temperature distribution from discharging currents and voltage between the upper and the lower contactors contacting to the wire and averaged wire temperatures of 100°C or less were obtained. But these data were not calibrated and were not precise enough.In this report we retry to obtain precise averaged wire temperatures for two types of power supplying methods. In the first method the power is supplied from the lower contactor and in the 2nd the power is supplied simultaneously from the upper and the lower contactors. Also two types of workpiece materials, SUS304 and SKD11 are machined and results are compared. Wire temperatures are calibrated. It was found that during Wire EDM the wire resistance facing to the workpiece is greater than the static value and especially great in the case of ferromagnetic workpiece. Obtained averaged wire temperatures were almost 100°C at the maximum cutting speed for any cases.