Fundamental Investigation of Ultrasonic Assisted Surface Grinding of Inconel 718

Abstract

Inconel 718 has high yield strength, corrosion resistance, heat resistance and fatigue resistance, and possesses a lower thermal conductivity, leading to high grinding force and heavy wheel damage in grinding of this material. Against these problems, ultrasonic assisted grinding (UAG) can be the potential candidate for high efficiency processing of Inconel 718. The current work is, hence, to clarify the fundamental UAG characteristics of Inconel 718 by experimentally investigating the effect of vibration amplitude on grinding force, actual material removal and work-surface roughness under different process parameters such as the wheel rotational speed, wheel depth of cut and vibration amplitude. Summarizing the obtained results revealed that the grinding forces and the actual material removal in UAG are significantly smaller and larger, respectively, than those in conventional grinding. It is also found that ultrasonic vibration can improve the work-surface finish even at deep wheel depth of cut.

Grinding Characteristics of Waspaloy with High-Speed Reciprocation Grinding

“…Experimental conditions are shown in table 2. Peripheral speed of grinding wheel V is changed in this experiment to change only maximum grain depth of cut g m shown in equation (1). The grain cutting length l c shown in equation ( 2) is not affected by the change of peripheral speed of grinding wheel.…”

“…Heat-resistant alloy such as Inconel 718 or Waspaloy is widely used in the field of aerospace and aircraft [1]. Because of the low thermal conductivity of these materials, the grinding heat does not diffuse and the temperature around grinding area becomes high.…”