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

本研究探讨了利用加工中心进行干式电火花加工的可能性，并尝试了利用电火花加工中心进行超硬合金干式电火花加工，同时对超硬合金的三维加工进行了研究。首先，从研究结果出发，阐述了干式电火花加工可能采用MC加工的可能性。结果表明，当Z轴向加工到规定深度时，与Z轴向加工到一定深度时，X轴向加工到一定深度时相比，刀具电极以较高的加工速度被高速送至下一加工点。并尝试了利用具有高速送料能力和高加减速能力的MC的Z轴进行伪伺服送料的加工。在该结果中，虽然承认伪伺服的效果，但加工速度的提高达到了极限，因为Z轴移动速度由于Z轴具有重质量而受到限制。因此，有必要采用高频响工作台进行加工。本文介绍了一种超硬合金的加工方法，以及利用传统的电火花加工方法进行干式电火花三维加工的方法。结果表明，在超硬合金的加工中，对工具电极或工件施加超声波振动，加工速度的提高和工具电极的磨损率降低。此外，与过去的传统电火花加工相比，在加工速度、工具电极磨损率和加工精度方面，3D加工优于干式电火花加工。并对干式电火花五轴加工进行了三维加工的尝试.在该结果中，与通过3轴加工的加工相比，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.