Effect of grinding with different CBN grains applied to austempered ductile iron linked to quality and industrial cost

Souza, Rodrigo Ráfaga de; Moraes, Douglas Lyra de; Garcia, Mateus Vinícius; Lopes, José Cláudio; Ribeiro, Fernando Sabino Fonteque; Mello, Hamilton José de; Sanchez, Luiz Eduardo de Ângelo; Aguiar, Paulo Roberto de; Bianchi, Eduardo Carlos

doi:10.1007/s00170-021-06647-w

Cited by 10 publications

(1 citation statement)

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“…In various subtractive manufacturing processes, grinding exhibits dynamic characteristics wherein numerous rigid abrasive particles interact with the work surface, ultimately effecting material removal through the generation of numerous ultra-fine scratches. This process involves the clearance of material by the scraping action of abrasive particles of diverse shapes, sizes, and geometries [12][13]. Three types of abrasive actions, namely friction, plowing, and shearing, occur during the interaction between the grinding wheel and the work surface, collectively influencing the efficiency of the grinding process [14][15].In this case, grinding encounters great challenges when used for silicon nitride ceramic processing [16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on surface topography and scratching performance of silicon nitride ceramics ablated by nanosecond pulsed laser

Niu,

Pang,

et al. 2023

Int J Adv Manuf Technol

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In the processing of hard and brittle materials such as silicon nitride (𝑆𝑖 3 𝑁 4 ), machining is often accompanied by numerous shortcomings which lead to poor processing efficiency. In order to enhance the grinding efficiency of silicon nitride ceramics, the material's strength is weakened through a 355 nm nanosecond pulsed laser for generating microscale textural patterns on ceramic surfaces. This paper investigates the influence of overlap rate on the material surface and the scratching characteristics of single diamond abrasive grains on the grooved and cratered surfaces to elucidate the material removal mechanism of the textured surface. Experimental results indicate that the time series of laser ablation depth follows fractal geometry, and the laser ablation products primarily consist of a mixture of silicon and silica. Laser-induced surface texturing facilitates a transition in the material removal mechanism from a mode dominated by plastic flow to a mixed mode involving both brittle fracture and plastic flow. In contrast to grooved surfaces, cratered surfaces demonstrate diminished fracture impact regions and lower acoustic emission signal values, thereby making them more suitable for machining operations under high levels of scratching force.

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