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황주호(Jooho Hwang),김정환(Jung-Hwan Kim),심종엽(Jongyoup Shim) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
The error motion of a machine tool spindle directly affects the surface errors of machined parts. Spindle motion errors such as three translational motions and two rotational motions are undesirable. These are usually due to the imperfectness of bearings, stiffness of spindle, assembly errors, and external force or unbalance of rotors. The error motions of the spindle need to be reduced for achieving the desired performance. Therefore, the level of error motion needs to be estimated during the design and assembly process of the spindle. In this study, an estimation method for five degree-of-freedom (5DOF) error motions for a spindle with an angular contact ball bearing is suggested. To estimate the error motions of the spindle, the waviness of the inner-race of bearings and an external force model were used as input data. The estimation model considers the geometric relationship and force equilibrium of the five DOFs. To calculate the error motions of the spindle, not only the imperfections of the shaft and bearings but also driving elements such as belt pulley and direct driving motor systems are considered.
황주호(Jooho Hwang),부이바친(Chinh B. Bui),이찬홍(Chan Hong Lee) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
This paper describes a method, which is based on the 4 body diagonal (ISO 230-6) and additional shift diagonal measurements method (SDM), to determine the errors of 3D positioning errors of axes. Using MDM, twelve multi-axes errors including three linear position errors, six straightness errors and three perpendicular errors can be calculated. To confirm the proposed method, SDM was applied to measuring 3 axes of machine tools and compared with directly measurement of each errors.