Study on High Speed Machining for Super hard alloy by Dry EDM using Machining Center

本研究探讨了用加工中心进行干法电火花加工的可能性，尝试了用干法电火花加工超硬质合金，并进行了三维加工的研究。首先，从研究结果出发，阐述了利用MC加工干式电火花加工的可能性。结果表明，Z向加工达到规定深度时，刀具电极高速送到下一个加工点的加工速度比Z向刀具电极略有切深、X向高速送出刀具电极的加工速度高。并尝试了利用MC具有高速发送能力和高加减速能力的Z轴伪随动发送进行加工。在这一结果中，由于Z轴的质量较大，Z轴的运动速度是一个极限，因此虽然承认了伪伺服的影响，但加工速度的提高达到了极值。因此，利用高频响应工作台对其进行加工是非常必要的。本文介绍了超硬合金的加工和传统电火花加工的干式电火花加工。结果表明，在超硬合金加工中，在刀具电极或被加工件上施加超声波振动，加工速度的提高和刀具电极磨损率的降低。与以往的传统电火花加工相比，三维加工在加工速度、刀具电极磨损率、加工精度等方面均优于干式电火花加工。并尝试采用干式电火花五轴联动加工进行三维加工。结果表明，与三轴联动加工相比，加工速度显著提高。

In this research, we investigated the possibility of the Dry EDM(electric discharge machining) using machining centre (MC), and we attempted a super hard alloy machining by the Dry EDM using a die sinking EDM, and the research on three dimension machining (3-D machining) were done. First of all, it describes from the investigation result of the possibility that the Dry EDM is possible to process by using a MC. As a result, it have been obtained the higher machining speed when it processes Z axially and it reaches prescribed depth, the tool electrode is sent to the following processing point at high speed compared with when the tool electrode a little cut depth was put Z axially and the it was sent X axially at high speed. And the processing by the pseudo-servo sending using the Z axis of MC which have a high-speed sending ability and a high acceleration and deceleration ability was tried. In this result, the improvement of the machining speed reached the ceiling though the effect of a pseudo-servo was admitted, because the Z axis movement speed is a limit due to the Z axis have the heavy mass. Therefore, it is necessary to process it by using the working table with a high frequency response.Here, a super heard alloy machining and the 3-D machining by Dry EDM using a traditional EDM are described. As a result, a super heard alloy machining, when the supersonic vibration was added to the tool electrode or the workpiece, the improvement of the machining speed and the tool electrode wear ratio were decreased. Moreover, 3-D machining was excellent the processing in the Dry EDM in the point of the machining speed, the tool electrode wear ratio, and the processing accuracy compared with the traditional EDM processing of the past. And we were tried to a 3-D machining by the Dry EDM using 5-axis machining. In this result, the machining speed's remarkably improving compared with the processing by 3-axis machining.