High Spindle Speed Wire Electrical Discharge Grinding Using Electrostatic Induction Feeding Method

Abstract:

This paper describes machining characteristics of high spindle speed WEDG using the electrostatic induction feeding method. In this method, non-contact electric feeding allows the workpiece rod to be rotated at a high speed of up to 50000rpm. Since the temperature rise on the workpiece surface is low, the material removal rate was two times higher and the surface roughness was also improved compared to the normal RC discharge circuit where the rotational speed was 1000rpm at the highest due to contact electric feeding using a brush. Furthermore, micro rods thus prepared were used as tool electrodes to machine micro-holes with the same rotation speed of 50000rpm. It was found that smaller gaps and better straightness can be obtained due to the high flushing efficiency at the high spindle speed.

• Periodical: Key Engineering Materials (Volumes 447-448)
• Pages: 268-271
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.447-448.268
• Online since: September 2010
• Authors: Yuna Yahagi, Tomohiro Koyano, Masanori Kunieda, Xiao Dong Yang
• Keywords: Electric Discharge Machining (EDM), High Spindle Speed, Micro Precision Machining, Nanoprecision Machining

References

[1] M. Kunieda, A. Hayasaka, X. D. Yang, S. sano, I. Araie: Study on Nano EDM Using Capacity Coupled Pulse Generator, Annals of the CIRP, 56(1) (2007), pp.213-216.

DOI: 10.1016/j.cirp.2007.05.051

[2] X. D. Yang, M. Kunieda, S. Sano, I. Araie: Machining Properties of Micro EDM Using Electrostatic Induction Feeding, Proc. of ISEM XV (2007), pp.231-234.

[3] Y. Yahagi, T. Koyano, M. Kunieda, X. D. Yang: Improvement of Machining Characteristics of Micro EDM by Electrostatic Induction Feeding to High Speed Spindle, Proceedings of Annual Meeting of the Japan Society of Electrical Machining Engineers(2009).

DOI: 10.2493/jjspe.76.1156

[4] T. Masuzawa, M. Fujino, K. Kobayashi: Wire Electro Discharge Grinding for Micro-Machining, Annals of the CIRP, 34(1) (1985), pp.431-434 Fig. 4 Tool electrodes after drilling (b) 50000rpm.

DOI: 10.1016/s0007-8506(07)61805-8

[80] 2䃛m (a) 1000rpm.

[78] 8䃛m Fig. 4 Tool electrodes after drilling (b) 50000rpm.

[80] 2䃛m (b) 50000rpm.

[80] 2䃛m (a) 1000rpm.

[78] 8䃛m (a) 1000rpm.

[78] 8䃛m (a) Inlet (1000rpm).

[88] 4ȣm 80. 8ȣm (b) Outlet (1000rpm) (a) Inlet (1000rpm).

[88] 4ȣm 80. 8ȣm (b) Outlet (1000rpm) Fig. 5 Machined micro-holes (c) Inlet (50000rpm).

[86] 4ȣm (d) Outlet (50000rpm).

[82] 2ȣm Fig. 5 Machined micro-holes (c) Inlet (50000rpm).

[86] 4ȣm (d) Outlet (50000rpm).

[82] 2ȣm.