Ultrasonic Assisted Diamond Turning of Hardened Steel for Mould Manufacturing


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Diamond turning of steel parts is conventionally not possible due to the high tool wear. However this process would enable several different applications with high economical innovative potential. One technology that enables the direct manufacturing of steel components with monocrystalline diamond is the ultrasonic assisted diamond turning process. This technology has been investigated over the years within the Fraunhofer IPT and is now commercialized by its spin-off company son-x. Surface roughness in the range of Ra < 5 nm can be achieved and the diamond tool wear is reduced by a factor of 100 or higher. In order to prove the industrial suitability of the process, two aspherical shapes and one large spherical geometry have been manufactured. The possible form accuracies and surface roughness values will be described in this paper, as well as the tool wear. The goal was to achieve optical surface roughness and a shape accuracy below 300 nm.



Edited by:

W.B. Lee, C.F. Cheung and S. To




B. Bulla et al., "Ultrasonic Assisted Diamond Turning of Hardened Steel for Mould Manufacturing", Key Engineering Materials, Vol. 516, pp. 437-442, 2012

Online since:

June 2012




[1] M. Heselhaus, Unidirectional ultrasonic assited ultra precision machining of ferrous metals with defined cutting edge, Dissertation RWTH Aachen, (2009).

[2] T. Moriwaki, E. Shamoto, Ultraprecision diamond turning of stainless steel by applying ultrasonic vibration, Ann. CIRP 40 (1991) 559-562.

DOI: https://doi.org/10.1016/s0007-8506(07)62053-8

[3] F. Klocke; O. Dambon, B. Bulla, Direct diamond turning of aspheric steel moulds in ultra precise accuracy, Proceedings of the 25th ASPE Annual Meeting, Atlanta, (2010).

[4] D.E. Brehl, T.A. Dow, Review of vibration-assisted machining, Precis. Eng. 32 3 (2008) 153-172.

[5] T. Moriwaki, Development of 2DOF ultrasonic vibration cutting device for ultraprecision elliptical vibration cutting, Key Eng. Mat. 447 - 448 (2010) 164-168.

DOI: https://doi.org/10.4028/www.scientific.net/kem.447-448.164

[6] E. Shamoto, T. Moriwaki , Study on elliptical vibration cutting, CIRP Ann. -Manufacturing Technology 43 (1994) 35–38.

DOI: https://doi.org/10.1016/s0007-8506(07)62158-1

[7] O. Rübenach, Vibration assisted ultra precision machining of optical glass with single crystal diamond tools, PhD Thesis, RWTH Aachen, 2001, 42-54.