Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 06, 2021
In recent years, more efficient internal combustion engines have been required to solve global warming problem. It is necessary to realize the non-axisymmetric non-cylindrical inner cylinder machining of about several tens of micrometers, which is difficult to be solve. Moreover, there is no inner cylinder machining method and machine tool machining this shape. In this research, we develop a spindle motor that can generate radial force and rotational torque at the same time. This makes it possible to control the rotational motion of the spindle and the axial position of the spindle simultaneously. Therefore our main research purpose is that we develop a high-performance spindle to machine the inner cylinder shape with high accuracy by controlling the precession of the spindle and the rotational angler position of the spindle. First, building a control model required for position control of the tool tip point set on the spindle, then estimate the disturbance using a disturbance observer, and create a control system that can cancel the actual disturbance by feedback of the estimated disturbance value. To validate the proposed method, the active center position control of the spindle axis was carried out comparing with a control model. After that, applying disturbance to the spindle during rotating, and the performance of the positioning control is evaluated.
