Grinding Journal - Fall 2007 - (Page 14)

r ductive g grinding of g Grinding an HP vane with a revolutionary new technique that uses the acceleration and speed of linear motors to take many fast, shallow grinding strokes to achieve high material removal with a minimum of heat and stress S ince the early days of metallurgy, alloys have evolved to meet performance requirements. Just as hard steels were developed for swords in ancient times, today tough, heatand corrosion-resistant alloys are being developed for demanding applications such as nuclear power components, high-performance automotive parts, and jet engine turbine blades, vanes, shrouds and disks able to withstand temperatures over 2,000˚ F. Such “superalloys” exhibit excellent mechanical strength and creep resistance at high operating temperatures, with superior resistance to corrosion and oxidation. They generally are based on nickel or cobalt and feature a complex combination of other elements. Superalloys are known under a number of trade names including Inconel®, Hastelloy®, René®, and Haynes®, and also exist as proprietary materials developed by the product manufacturers themselves. High-performance materials usually present manufacturing challenges, and superalloys are no exception. Superalloys have the tendency to workharden at the surface and generate heat during machining. They are relatively poor conductors of heat, and accumulated high temperatures can interfere with the cutting process and/or deform or damage the part. A relative machinability comparison of selected alloys (considering cutting speed, surface finish, and tool life) places carbon steel 1212 at 100 percent, stainless steel 440 at 45 percent, and Inconel 718 at only 19 percent. Fall/Winter 2007

Table of Contents Feed for the Digital Edition of Grinding Journal - Fall 2007

Grinding Journal - Fall 2007 Contents From Virginia: Apparently no credit crunch for machine tools Why measure cutting tools Other perspectives on CNC tool measuring Productive grinding of superalloys SUPER service grinding BIG rolls Problem Solver

Grinding Journal - Fall 2007

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