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

在本研究中，我们研究了使用加工中心（MC）进行干式电火花加工（放电加工）的可能性，并尝试使用沉模电火花加工进行干式电火花加工的超硬合金加工，并进行了三维加工（3-D加工）的研究。首先，从调查结果描述了使用MC进行干式电火花加工的可能性。其结果是，与将刀具电极在Z轴上稍微切入并在X轴上高速送出时相比，在Z轴上加工并达到规定深度时，能够获得更高的加工速度，并且刀具电极高速地送至下一个加工点。并尝试了利用具有高速发送能力和高加减速能力的MC的Z轴进行伪伺服发送处理。在这个结果中，虽然承认了伪伺服的效果，但加工速度的提高已经达到了天花板，因为Z轴的质量很大，Z轴的移动速度是有限的。因此，有必要采用具有高频响应的工作台进行加工。这里介绍超高速合金加工和使用传统电火花加工的干式电火花加工3D加工。结果，在超高速合金加工中，当对工具电极或工件施加超声波振动时，加工速度的提高和工具电极的磨损率均下降。此外，与过去的传统EDM加工相比，3D加工在加工速度、工具电极磨损率和加工精度方面优于干式EDM加工。我们尝试使用 5 轴加工通过干式 EDM 进行 3D 加工。结果，与三轴加工相比，加工速度显着提高。

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.