A modified model for estimating the contact length in surface grinding

Setti, Dinesh; Ghosh, Sudarsan; Rao, P.V.

doi:10.1177/0954405414558733

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…18 However, in reality, the real contact length is a multiple of the geometric contact length. 38 Two-half slot method is used in this work to estimate the real contact length under different grinding conditions. In the present study, two half slots of width of 2 mm and depth of 0.2 mm are made over alumina grinding wheel maintaining a gap of 5 mm between the slots.…”

Section: Experimental Details and Proceduresmentioning

confidence: 99%

Modelling of specific grinding energy for Inconel 718 superalloy

Sinha

Ghosh

Rao

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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The present work is an attempt to model the components of specific grinding energy in a pragmatic manner. This work explores the contribution of specific energy constituents such as shearing, primary rubbing, secondary rubbing, and ploughing energy while grinding Inconel 718 (IN-718) superalloy. Specific shearing energy has been calculated using the dynamic yield strength of IN-718 as obtained by adopting the Johnson–Cook material model. Specific rubbing energy has been estimated using real contact length measured experimentally. Rubbing grit density has been estimated by considering grinding infeed, grit size, wheel structure, and work material hardness unlike the previous models, where it was mostly taken as a constant value. Single grit grinding experiments have been performed with 36 and 20 mesh size single alumina grits to obtain the insight of ductile flow in IN-718 grinding. These experiments have been conducted at grinding speeds of 5, 10, and 15 m/s using vacuum brazed single alumina grit shank fitted into aluminium make dummy grinding wheel. Specific ploughing energy has been estimated after suitably apportioning the tangential forces as obtained from single grit grinding. Two-dimensional study of the scratch profiles has been performed using a compound microscope to investigate plausible ploughing mechanisms of IN-718. The present studies indicate that at lower infeeds, micro-fracturing of alumina grits is more recurrent, whereas wear flattening is more common at higher infeed. The higher pile-up ratio at lower infeed signifies more ploughing resulting into inefficient cutting causing more energy consumption. The micro-fracturing of single alumina grit while scratching has also been observed. The present model for specific grinding energy is an improved version of earlier energy models as it incorporates variables which are much closer to the actual grinding conditions.

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Section: Experimental Details and Proceduresmentioning

confidence: 99%

Modelling of specific grinding energy for Inconel 718 superalloy

Sinha

Ghosh

Rao

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…In order to simplify the analysis of individual interaction with the workpiece material, different shapes for abrasive grit have been approximated. In this article, a conical shape 28,29 will be used for mathematical simplification. The semi-included angle of the active grit θ is 60°.…”

Section: Theoretical Model For Ductile Grindingmentioning

confidence: 99%

A critical energy model for brittle–ductile transition in grinding considering wheel speed and chip thickness effects

Liang

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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The ability to predict the critical depth for ductile-mode grinding of brittle materials is important to grinding process optimization and quality control. The traditional models for predicting the critical depth are mainly concerned with the material properties without considering the operation parameters. This article presents a new critical energy model for brittle–ductile transition by considering the strain rate effect brought by the grinding wheel speed and chip thickness. The experiments will be conducted through a high-speed diamond grinder on reaction-sintered silicon carbide materials under different grinding speed and chip thickness. Through detailed analysis of the strain rate effect on the dynamic fracture toughness, a new fracture toughness model will be established based on the Johnson–Holmquist material model (JH-2) and calibrated through experiments based on the indentation fracture mechanics. Then, the new critical model for brittle–ductile transition will be established by introducing the dynamic facture toughness model considering the wheel speed and chip thickness. According to scanning electron microscope observations, the results show that ductile-mode grinding can be obtained through a combination of higher grinding speed and smaller chip thickness. Moreover, the critical value for ductile grinding of brittle materials can be improved through the elevation of the grinding speed or reduction in the chip thickness.

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“…4 Because of the phase transformation during grinding hardening, there is residual compressive stress in the hardening layer of workpiece. [5][6][7][8] Therefore, the surface of workpiece will have a good impact resistance, fatigue strength, and abrasive resistance. Grinding hardening combines grinding process and surface hardening into one working procedure.…”

Section: Introductionmentioning

confidence: 99%

A research on the mechanism and model of surface micro-damage in grinding hardening

Shi

Zhang

Xiu

2021

Advances in Mechanical Engineering

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Grinding hardening can obtain hardening effect besides fine machining effect on the surface of workpiece. A certain degree of surface micro-damage will be formed during grinding hardening process which mainly contains micro-crack, melting coating, decarburization, and surface scratch. In order to study the micro-damage of grinding hardening, the paper carries on a grinding hardening experiment and the characteristics of micro-damage are observed. The generation mechanism of micro-crack is revealed. It is formed by the accumulation of dislocation pile-up in the condition of grinding hardening process. When the grinding depth reaches a certain value, the surface micro-crack will be produced obviously and become more serious with the increasing of grinding depth. Other micro-damage containing surface melting coating, decarburization, and surface scratch are also studied and their relevance with micro-crack is revealed. Based on the grinding hardening theory and pile-up dislocation theory, a model for micro-crack of grinding hardening is established. The calculating result of the model accords with the experimental result in general.

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A modified model for estimating the contact length in surface grinding

Cited by 6 publications

References 25 publications

Modelling of specific grinding energy for Inconel 718 superalloy

Modelling of specific grinding energy for Inconel 718 superalloy

A critical energy model for brittle–ductile transition in grinding considering wheel speed and chip thickness effects

A research on the mechanism and model of surface micro-damage in grinding hardening

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