Designating the field areas for the contact of a rotary burnishing element with the rough surface of a part, providing a high-quality product

Analytical prediction and experimental verification of surface roughness during the burnishing process

“…To the author's knowledge, Kukielka made the earliest study on the smoothing mechanism using pure geometrical method to study how to select machining and subsequent burnishing parameters to produce a high-quality surface, in which the mechanical properties of workpiece are not considered [1]. The most comprehensively used AM model of burnishing was developed by Hertz theory [15], but the nature of burnishing is a superficial plastic permanent deformation, and the surface roughness must be taken into consideration when smoothing mechanism is studied, both of which are not included in Hertz theory; Luo developed the smoothing mechanism based on elasto-plastic contact and impact mechanics on the assumption that the asperities of the machined surface as spherical summits whose height accords with Gaussian distribution are continuously and smoothly deformed from elastic, through elasto-plastic, to fully plastic deformation [16], but the asperities of the machined surface are systematically stripy in most cases; Korzynski established the smoothing mechanism in which the asperities were seen as stripy and the relation between surface roughness and burnishing force was developed assuming that the cross-section of asperity maintained the shape of wedge and the plane which burnishing force act on was dominated by uniaxial compression [17], but by the solutions to the Boussinesq-Flamant problem, the equivalent stress in the apex of asperity exceeds the yield stress just at the beginning of burnishing and then the apex plastically deforms to a flatform [18], thus the assumption of uniaxial compression is more suitable for the machined asperities with small semi-angle.…”

“…Surface, small in volume relative to the core, always determines the major functional properties of components such as friction, wear, corrosion, fatigue and load capacity. Improper physical and stereometrical properties of surface cause the failure damage in approximately 85% of modern machine components [1]. Machining processes always damage the surface integrity of component and produce rough surface, crack and tensile residual stress on surface, especially to those difficult-to-cut materials frequently used in such key components like high-strength steel, stainless steel, aluminum alloy and superalloy.…”

Finite Element Calculation of Residual Stress and Cold-work Hardening Induced in Inconel 718 by Low Plasticity Burnishing

“…The life, performance and cost of aero-engine are to a large extent depend on some key components, these components are working under heavy and critical conditions, the major functional properties of them such as fatigue strength, friction, load capacity are dominated by the outer layer, Improper physical and stereometrical properties of the surface cause failure damage in approximately 85% of modern machine units [1].…”

A Study of Some Surface Characteristics When Burnishing With a New Tool

“…During recent years, considerable attention is being paid to the post-machining metal finishing operations such as burnishing which improves the surface characteristics by plastic deformation of the surface layers [1,2]. Burnishing is essential a cold-forming process, in which the metal near a machined surface is displaced from protrusion to fill the depressions.…”