Elastic Impact of Abrasives for Controlled Erosion in Fine Finishing of Surfaces

Abstract

Finishing of surfaces using free abrasive impingement is one of the constructive applications of erosive wear, well suited for complex shaped engineering components with difficult-to-access surfaces. Low velocity impact of abrasives in aßuidized bed is reported as a promising choice to impart fine finish on the target surface. An improved methodology to control the erosion and to achieve ultra fine finish through elastic impact of abrasives, using a carrier type-fluidized abrasive finishing, is discussed in this paper. Using the basic concepts of impact theory and contact mechanics, a revised mathematical modei to express the depth of erosion as a function of material properties of target and erodent is proposed. Modification in erodent abrasive to introduce an elastic nature to the impact is described in detail using the theoretical model. This is substantiated through a particledropping experimental study. The effect of multiple impacts in a practical situation is also discussed through a detailed experimental study, clearly demonstrating the concepts of elastic impact erosion for surface finishing.

Synergistic effects in hydrodynamic cavitation abrasive finishing for internal surface-finish enhancement of additive-manufactured components

“…Such impacts are a result of acceleration due to cavitation implosion (not noticed in pure cavitation and pure abrasion conditions). The findings are in good agreement with the observations from other investigations [51][52][53]. The positive synergistic effects contribute to a comprehensive removal of the surface asperities, resulting in a smooth and uniform surface finish.…”

Analysis of abrasives on cutting edge preparation by drag finishing

“…When high than this critical strain, δσ/δε<0, so the plastic deformation is localized to form a lip. As shown in previous studies [ [39]- [40], the plastic flow behavior of materials deformation can be easily obtained, and the critical strain (εc) formed by the lip can be obtained. The following equations are related to flow stress (σ), plastic strain (ε) and temperature (T)  …”

Modeling of Material Removal Rate in Vibration Assisted Nano Impact-Machining by Loose Abrasives

“…4 [35], In the elastic zone, the abra sive particle impact induces surfaces stresses on the workpiece surface as a result of elastic deformations; however, material re moval does not occur. As the normal impact force FIN exceeds a critical value Fph plastic deformation occurs on the workpiece resulting in material removal.…”