tailieunhanh - A fundamental study on Ti–6Al–4V’s thermal and electrical properties and their relation to EDM productivity

(BQ) In the study, temperature measurements have been made for Ti–6Al–4V workpieces with various duty factors to clarify the essential causes of difficulty in machining titanium alloys and observe the optimal duty factor in terms of productivity and quality. | j o u r n a l o f m a t e r i a l s p r o c e s s i n g t e c h n o l o g y 2 0 2 ( 2 0 0 8 ) 583–589 journal homepage: A fundamental study on Ti–6Al–4V’s thermal and electrical properties and their relation to EDM productivity Peter Fonda a , Zhigang Wang a,∗ , Kazuo Yamazaki a , Yuji Akutsu b a b Department of Mechanical & Aeronautical Engineering, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA Sodick Corporate Headquarters, 1605 N. Penny Lane, Schaumburg, IL 60173, USA a r t i c l e i n f o a b s t r a c t Article history: There are strong needs for productive/quality machining strategies of notoriously “difficult- Received 21 June 2007 to-machine” aerospace materials. The current means of machining these materials is Received in revised form dominated by mechanical cutting methods, which are costly due to high tooling costs, 15 August 2007 poor surface quality and limitations in the workpiece features and operations that can be Accepted 24 September 2007 machined. The newest EDM technology may be able to circumvent problems encountered in mechanical machining methods. In this paper, the EDM technology has been used to machine titanium alloy Ti–6Al–4V to investigate the effect of Ti–6Al–4V’s thermal and elec- Keywords: trical properties on the EDM productivity. In the study, temperature measurements have EDM been made for Ti–6Al–4V workpieces with various duty factors to clarify the essential causes Temperature stability of difficulty in machining titanium alloys and observe the optimal duty factor in terms of Duty factor productivity and quality. Titanium alloys 1. Introduction In aerospace industry, titanium alloys have been widely used because of their low weight, high strength or high temperatures stability. For example, a typical Boeing 747 aircraft contains approximately 40,000 pounds of titanium, a little over 10% of its total weight (Guitrau, 2006). Titanium alloys .