Parallel Mechanism and its Application in Design of Machine Tool with Numerical Control

Abstract

This paper describes the design of machine tool based on the mechanism with parallel kinematic structure (PKS) called hexapod. The advantages of mechanisms with PKS predetermine them to the field of machining and robotics. Machine tool is designed like fully automated device contains system for automatic tool and part changing too. There was necessary to solve also a question of operation safety according to the real risk of injury. Some information about the design process, main requirements, the problems and the final solution can be found in this paper.

Influence of roller - burnishing on surface roughness parameters and roundness

“…2. Because the burnishing is essentially a cold forming process, in which the metal near a machined surface is displaced from protrusions to fill the depressions [21][22][23], there is the fig. 8 for to better illustrate changes of the surface profile.…”

The Modelling of Mechanism with Parallel Kinematic Structure in Software Matlab/Simulink

“…Hexapod mechanism (left) and its components (right)description in text below [1,2] The size of generated functional block diagram depends on the total number of free components. It means that if we want to reduce the complexity of the block diagram, it is necessary to cover the components which move together into the subassembly [8].…”

“…Prototype of machine tools based on Hexapod mechanism and second version of simulation software designed in Delphi programming language[2] …”

Modelling and Simulation of Machine Tool Prototype with 6DOF Parallel Mechanism in Matlab / Simulink

“…Parallel mechanisms actuated in parallel by several serial kinematic chains can offer higher accuracy and stiffness, very high motion speed, and heavier payloads than their serial opponents [1][2][3][4][5]. Nowadays, the conventional parallel mechanism with six degrees of freedom (DOFs) of three translations and three rotations (structure 3T3R), also known as the Stewart platform, can be found in wide variety of applications involving motion simulators [6,7], parallel machine tools [8][9], force-torque sensors [10][11][12], heavy-duty free forming production machine [13], testing stands, antennas, micro-positioning units [14][15], calibration devices [16], etc.…”

“…During last fifteen years, there was formed a group of researchers dealing with the parallel kinematic structures development as well as at the authors workplace [3,4,18]. There have been proposed various design concepts of the mechanisms with parallel kinematic structure as well as different kind of simulation software for these mechanisms within this period.…”