Departmental Bulletin Paper Numerical Analysis of Mixed Fluid Jet Flows through Cutting Fluid Supplying Nozzle

S, Chung  ,  B, Shin

46pp.65 - 70 , 2017-07-31 , 宮崎大学工学部
Metal cutting operation involves generation of heat due to friction between the tool and the cutting materials. This heat needs to be carried away otherwise it creates white spots. To reduce this abnormal heat cutting fluid is used. Cutting fluid also has an important role in the lubrication of the cutting edges of machine tools and the pieces, and in sluicing away the resulting swarf. As a cutting fluid, water is a great conductor of heat but is not stable at high temperatures, so to improve stability an emulsion type mixed fluid with water and oil is often used. It is pumped over the cutting site of cutting machines as a state of atomized water droplet coated with oil by using jet flow. In this paper, to develop cutting fluid supplying nozzle with ultra-thin oil film coating of water droplet, a numerical analysis of three dimensional mixed fluid jet flows through multi-stage nozzle was carried out by using a finite volume method. Jet flow characteristics such as nozzle exit velocity, development of mixing region, re-entrance and jet intensity were analyzed. Detailed mixing process of air, water and oil in multi-component fluid were also investigated. And the important flow information for advance design of cutting fluid supplying nozzle was drawn.

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