NDLI: Electrodischarge drilling performance on parts produced by DMLS

Content Provider	Springer Nature Link
Author	Gatto, Andrea Iulia, Luca Caligna, Flaviana Bassoli, Elena
Copyright Year	2011
Abstract	Cobalt-base alloys are generally adopted in applications that require wear, corrosion, and heat resistance. In particular, cobalt–chromium–molybdenum (Co–Cr–Mo) alloy is currently being used in the aerospace and medical field. Both applications require product personalization and take advantage by parts manufacturing through additive technologies, such as direct metal laser sintering (DMLS). This technology still has limitations for the manufacture of small cavities, such as holes with diameters below 0.6 mm and high aspect ratio, which require drilling of the additive manufactured part. This research aims at investigating the effects of electrodischarge drilling (EDD) on surface and subsurface features of CoCrMo samples built by DMLS. High aspect ratio holes are produced with diameter of 0.6 mm and depth 15 times higher. Due to the absence of physical contact between tool and workpiece in EDD, machining forces are negligible and microfeatures can be produced with a high accuracy irrespective of the material hardness and strength. In this study, peak current, pulse-on-time, and duty ratio are adopted as control factors using the Taguchi method. Material removal rate, Electrode wear rate (EWrate), and surface roughness are measured as responses. S/N ratios and analysis of variance analysis lead to identify the significant process parameters and the optimal combination level of machining parameters. From the responses can be determined which ensures high productivity and smooth surface finish, even if tool wear is medium high. All the analyses are supported by the study of material removal mechanisms and surface morphology in the microscale, to account for the macroscopic trends.
Starting Page	1003
Ending Page	1018
Page Count	16
File Format	PDF
ISSN	02683768
Journal	The International Journal of Advanced Manufacturing Technology
Volume Number	58
Issue Number	9-12
e-ISSN	14333015
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-23
Publisher Place	London
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cobalt alloys Electro discharge drilling Direct metal laser sintering Material removal rate Electrode wear Surface roughness Production/Logistics/Supply Chain Computer-Aided Engineering (CAD, CAE) and Design Mechanical Engineering Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Mechanical Engineering Computer Science Applications Software

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