An Attempt to Measure a Wire Temperature Distribution on Wire EDM. 2nd Report: Averaged Wire Temperature during EDM.

Abstract

To prevent the wire breakage Abstract during Wire EDM there should be information of the wire tem- perature because it is said that our previous report1) we tried the wire may be broken by increasing of wire temperature. In 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 100C 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, atures are calibrated. SUS304 and SKD11 are machined and results are compared. It was found that during Wire EDM the wire resistance facing Wire temper- to the work- piece is greater than the static value and especially great in the case of ferromagnetic workpiece. Obtained averaged wire temperatures were almost 100C at the maximum cutting speed for any cases. 1.