Abstract
This paper presents the theoretical design for experimental verification of the structural and technological parameters of the Parallel Kinematic Structure. The experimental equipment was developed at the Faculty of Mechanical Engineering, STU in Bratislava. It is called Tricept, and due to its kinematics it is classified as a parallel structure. The previous phase of the project dealt with developing a mathematical model of the tool path. We have worked with two methods, a Monte Carlo method and the use of a mathematical analytical geometry structure. The calculated values were verified by comparing the results of the two methods. Based on the equations that were obtained, we can design the control of the tool path during cutting. The next stage focuses on the test methods and on verifying the structural and technological parameters of Tricept. The experiment is designed on the basis of the EN ISO 9283 standard, and involves testing the technological parameters: one-way positioning accuracy and repeatability of the position, changes of multidirectional positioning accuracy, repeatability and accuracy of the distance, position overshoot, drift of the position parameters, path accuracy, and repeatability of the path. This paper classifies the measurement methods and presents the measurement processes and the equipment for the experiment.
Highlights
The current trend is toward high-speed machining, which encourages the development of machine tools with high dynamics, improved rigidity and reduced moving masses
The central rod placed on the fixed platform allows translational motion without any turning.This type of mechanism is created from kinematic pairs of HPS type
The location of the primary points is important in creating the program that will be used to manage the ejection of the telescopic rods
Summary
The current trend is toward high-speed machining, which encourages the development of machine tools with high dynamics, improved rigidity and reduced moving masses. On the basis of these attributes, parallel kinematic mechanisms offer the potential to change current production forms. They have the potential to be highly modular, highly configurable, high-precision machine tools. There are as many degrees of freedom as necessary, and the axes are arranged in series This results in a single kinematic chain. The axes are generally arranged by Cartesian axes, which means that there is an x-axis, a y-axis and a z-axis, and rotation axes if necessary These machines are easy to handle, because each axis directly controls one Cartesian degree of freedom, and there is no connection between the axes. A parallel mechanism is a closed mechanism, in which the end-effector (the mobile platform) is connected to the base by at least two independent kinematic chains
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