Title: Parametric multi-axis tool path planning for CNC machining: the case of spur gears
Authors: Athanasios Giannakis; George-Christopher Vosniakos
School of Mechanical Engineering, Manufacturing Division, National Technical University of Athens, Heroon Polytehneiou 9, 15780 Zografou, Athens, Greece.
School of Mechanical Engineering, Manufacturing Division, National Technical University of Athens, Heroon Polytehneiou 9, 15780 Zografou, Athens, Greece
Abstract: Four and five axis machining strategies are difficult to standardise in the general case. General purpose CAM systems are an important tool allowing the experienced machinist to experiment with machining strategies and assess quality of the resulting tool paths. However, in the case of machine elements, such as gears, shape definition by parametric equations is most inviting for development of fit-for-purpose machining strategies and corresponding parametric tool paths without the use of CAM software. Such an approach is materialised in this paper for spur gears, drawing on discretisation of involute and trochoidal curves constituting the tooth profile, so as to satisfy scallop height constraints. The roughing stage is performed with a flat end mill, implementing slot milling along a meander type tool path. The finishing stage is performed with a bull-nose end mill, implementing peripheral milling circumferentially around the full gear profile. The algorithms were tested on a three-axis machining centre equipped with an additional 4th rotary axis to manufacture a plastic spur gear. [Received 29 December 2010; Revised 8 May 2011; Accepted 20 July 2011]
Keywords: tool path planning; multi-axis machining; parametric programming; plastic spur gears; CNC machining; tooth profile; gear tooth profile; CNC milling.
Int. J. of Manufacturing Research, 2012 Vol.7, No.4, pp.354 - 375
Available online: 27 Oct 2012