Abstract
In this paper, processing characteristics and difficulties of drum with fold line grooves are analyzed. Three kinds of CNC machining methods, namely three-axis linkage, single-axis servo and two-axis servo, are introduced. With CNC machining methods of single-axis servo and two-axis servo, the spindle motor of machine tool needs not to transform. A CNC system is developed which acquires the absolute position on the circle of drum through the spindle encoder and spindle zero position switch. It allows simultaneous servo position and velocity control of Z-axis AC servo motor or both Z-axis and X-axis AC servo motors. With the changes of angular displacement of spindle, the system manages the interpolation motion of X-axis and Z axis, so drums with fold line grooves can be achieved by this way. Both of these methods have been applied to transformation of machine tool with simple, economical and reliable operation. This paper also proposes three methods to improve the processing efficiency of the drum: increasing a function of return to zero rapidly, processing with more tools at the same time, processing external steel sleeve with fold line grooves and then installing it on a smooth drum.
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