Optimal selection of feed electric drives for boring machines

Abstract

In this paper are analyzed and formulated the main requirements for the drive systems of a class of modernized boring machines with digital program control. On this basis, a methodology for optimal selection of feed drives is offered. The respective algorithm takes into account the specific features of the technological process, the treated material, the tools used and their wear, the mechanical gears types and the guides. Concrete examples with DC and AC electric drives are presented, illustrating the practical application of the methodology. The research held as well as the results obtained can be used in the development of such electric drives for the studied class of machine tools with digital program control.

Study and Performance Improvement of the Drive Systems for a Class of Machine Tools

“…The basic requirements to the auxiliary drives can be described this way [8]: angular positioning of the workpiece with desired accuracy; subsystem providing choice of the necessary tools; lubrication of the machine axes; appropriate cooling subsystem.…”

“…The tabular data are taken from companies producing tools, mechanical gears and guides [11][12][13]. Methodologies for selection of spindle drives, linear and rotary feed drives for different mechanical operations are presented in [8][9][10], [14,15]. The catalogue data are obtained from the some manufactures of motors, power converters, sensors and mechanical gears [16][17][18][19][20].…”

“…The feed drives are applied for positioning of both the tools and the workpieces at the respective positions and they partake in the machining process. The following requirements to them can be formulated [8]: speed control in a wide range; good dynamics; high positioning accuracy; realization of the needed movement cycles; providing the required torque; reversible speed and torque regulation; compensation of the disturbances; convenient maintenance; reliability. The introduced rotary table has two coordinate axes: a -with tilting of 0° ÷ 90° and c -with rotation of 0° ÷ 360°.…”