Ik-Soo Kang

A Study on the Design for the Air Impeller of a Finishing Tool Unit

Received 8 March 2015; received in revised form 27 April 2015; accepted 27 April 2015ABSTRACTThe grinding and furbishing process as the finishing process for molds include the works suchas the grinding, buffing, lapping and polishing among others. A finishing tool unit is applied tothis finishing process for the burr, lapping, polishing and others of molds. A finishing tool unitcan carry out the flexible machining, depending on the machining allowance for objects to becut on the basis of the instrumental driving mechanism which enables the up, down, left andright floating, which is applied in link with the dedicated cutters and robot machining systems.This study selected the shape to increase the rotatory force of an impeller when air is dis-charged during the driving of a finishing tool unit, and reflected it to the impeller designing. Inaddition, the study analyzed each flow velocity and pressure distribution per air pressurizationvalue and finally analyzed the rotating torque to suggest the optimal conditions in designingimpellers.Key Words: Air impeller, CFD analysis, Design, Finishing tool unit

An Investigation of Machining Characteristics in Micro-scale Milling Process

In this paper, an analytical solution of micro‐scale milling process is presented in order to suggest available machining conditions. The size effect should be considered to determine cutting characteristics in micro‐scale cutting. The feed per tooth is the most dominant cutting parameter related to the size effect in micro‐scale milling process. In order to determine the feed per tooth at which chips can be formed, the finite element method is used. The finite element method is employed by utilizing the Johnson‐Cook (JC) model as a constitutive model of work material flow stress. Machining experiments are performed to validate the simulation results by using a micro‐machining stage. The validation is conducted by observing cutting force signals from a cutting tool and the conditions of the machined surface of the workpiece.