Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP29-0021
Comparison of EDM Trimming with Ultrasonic Assisted Milling (UAM) for the Permeability Mold Steel Fabricated by SLM-AM Technology
1Department of Mold and Dies Engineering, National Kaohsiung University of Science and Technology, Taiwan
2VOESTALPINE Technology Institute (ASIA), Taiwan, R.O.C.
ABSTRACT
This report aims at the surface treatment of the laminate metal by Selective Laser Melting (SLM-AM) to prepare permeability steel (Uddeholm CORRAX AM). Comparative studies involve EDM processing and ultrasonic-assisted milling (UAM) derived from conventional milling (CM). Experiment results demonstrate that the UAM+GAS can reduce the pore backfilling phenomenon of conventional one, but the permeability loss is still severe. However, with EDM processing, the air permeability rate is significantly improved by energy discharging processes. Their permeability loss rates are compared for EDM, (UAM+G), (CM+G), and CM. It is confirmed that EDM is with the least pore refill blocking. However, after the positive polarity finishing with orbital EDM, it still loses about 50% of the permeability compared to as-built AM. However, by multi-passes EDM, higher-energy discharges shrink the corners' burr of the pores, and the lower-energy EDM polishes the surface uniformly, resulting in a stable structure.
Keywords: Metal Additive Manufacture, Permeability Metal, EDM, UAM-Ultrasonic Assisted Milling
1Department of Mold and Dies Engineering, National Kaohsiung University of Science and Technology, Taiwan
2VOESTALPINE Technology Institute (ASIA), Taiwan, R.O.C.
ABSTRACT
This report aims at the surface treatment of the laminate metal by Selective Laser Melting (SLM-AM) to prepare permeability steel (Uddeholm CORRAX AM). Comparative studies involve EDM processing and ultrasonic-assisted milling (UAM) derived from conventional milling (CM). Experiment results demonstrate that the UAM+GAS can reduce the pore backfilling phenomenon of conventional one, but the permeability loss is still severe. However, with EDM processing, the air permeability rate is significantly improved by energy discharging processes. Their permeability loss rates are compared for EDM, (UAM+G), (CM+G), and CM. It is confirmed that EDM is with the least pore refill blocking. However, after the positive polarity finishing with orbital EDM, it still loses about 50% of the permeability compared to as-built AM. However, by multi-passes EDM, higher-energy discharges shrink the corners' burr of the pores, and the lower-energy EDM polishes the surface uniformly, resulting in a stable structure.
Keywords: Metal Additive Manufacture, Permeability Metal, EDM, UAM-Ultrasonic Assisted Milling
