A 3-DOF Parallel Manipulator Based 5-Axis Parallel Kinematics Machine Tool

Abstract

Though computer technology has brought about virtual manufacturing to expedite design and analysis through simulation and visualization, machines remain essential, as ultimately products need to be made. This paper presents a new type of 5-axis parallel machine tool based on a 3 degrees of freedom parallel platform manipulator with base mounted prismatic actuators. This machine tool is different from the Stewart platform type parallel machine tool in that its feed motion in X-direction is realized by the worktable on which work-piece is fixed and the parallel manipulator sliding on the gantry structure of the machine tool is responsible for the translation along Y-direction instead of the movable platform of the manipulator. Due to this special architecture, the workspace in X-direction and Y-direction of the new machine tool is enlarged greatly. And its rigidity is higher because of the adaptation of gantry structure. This machine tool is controlled by a PC based NC system in simultaneous 5 axes control mode.

Workspace Analysis of a 5-Axis Parallel Kinematic Machine Tool

“…After NC machines, parallel kinematic machines have opened a new domain in the machine tool industry. They are different from the conventional machines, since they are based on variable geometry truss structures [1]. 6-DOF parallel manipulator like Stewart platform requires six linear actuators for controlling; however, only three linear actuators are required to control 3-RPS mechanism.…”

“…The parallel manipulator slides on the frame structure of machine tool and translates along X-and Y-direction in order to increase the workspace in both the directions. Along with this, its rigidity also increases because of the adaptation of gantry structure [1].…”