Character and Behavior of Mist Generated by Application of Cutting Fluid to a Rotating Cylindrical Workpiece, Part 1: Model Development (original) (raw)

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During turning operation, high temperature is produced. S uch high temperature often leads to several problems like a large heat affected zone, high tool wear, change in hardness and microstructure of the work piece, burning and its consequence and micro cracks. Application of cutting fluids in conventional method reduces the above problems to some extent through cooling and lubricating of the cutting zone. But in this process the cooling rate is low. For this reason mist application technique has become the focus of attention of researchers and technicians in the field of machining as an alternative to traditional flood cooling. The concept of mist application of cutting fluid some time referred to as near dry machining. The minimization of the requirement of cutting fluids leads to economical benefits, and environmental friendly machining. In this work, attempts have been made to develop a mist application device to apply cutting fluid for turning operation of medium carbon steels...

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Mathematical Modelling of the Impact of Liquid Properties on Droplet Size from Flat Fan Nozzles

2021

Flat fan nozzles atomize crop protection products, breaking them into droplets. Droplet size matters – smaller droplets give better performance, but very small droplets drift. We want to use mathematical models to better understand how liquid properties affect droplet size. There are three types of breakup: wavy sheet, perforation, and rim. In wavy sheet breakup, we show that surface tension has little effect, but increasing viscosity leads to fewer droplets. Decreasing the jet velocity also results in fewer droplets, with a wider size distribution. Linear stability analysis suggests that increasing viscosity leads to larger droplets, and that it reduces the rate of breakup. Perforations – holes in the sheet – also lead to breakup. We find how the length fraction of the sheet that is void changes with time. After breakup, the droplets continue to evolve. We develop a model, based on a transport equation, for this process.

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Characterization of Fluid Film Produced by an Atomization-Based Cutting Fluid Spray System During Machining

Journal of Manufacturing Science and Engineering, 2013

The atomization-based cutting fluid (ACF) spray system has recently been proposed as a cooling and lubrication solution for machining hard to machine materials (e.g., titanium alloys). On the tool rake face, the ACF spray system forms a thin film from cutting fluid that penetrates into the tool–chip interface to improve tool life. The objective of this work is to characterize this thin fluid film in terms of thickness and velocity for a set of ACF spray parameters. ACF spray experiments are performed by varying impingement angle to observe the nature of the spreading film and to determine the film thickness at different locations after impingement of the droplets. It is observed that the film spreads radially outward producing three fluid film development zones (i.e., impingement, steady, and unsteady). The steady zone is found to be between 3 and 7 mm from the focus (impingement point) of the ACF spray for the set of parameters investigated. An analytical 3D thin fluid film model f...

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Character and Behavior of Mist Generated by Application of Cutting Fluid to a Rotating Cylindrical Workpiece, Part 1: Model Development (original) (raw)

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