March 2011

THE DEVELOPMENT OF MECHANISM BASED ON HYBRID KINEMATIC STRUCTURE

MM (Modern Machinery) Science Journal, March 2011
V. Poppeova, J. Uricek, Vl. Bulej
Department of Automation and Production Systems
Faculty of Mechanical Engineering, University of Zilina
Zilina, Slovak Republic
Abstract

Initial enthusiasm for the parallel kinematics in the eighties of the last century slumped significantly during the last twenty years. There were found some disadvantages of standard parallel kinematic structures. The experts around the world began to seek new solutions of outlined problems. They defined several possible ideas which could eliminate the drawbacks and improve the properties and advantages of parallel machines. One of these ways was also the application of mechanisms based on the kinematic structure that consisted of serial and parallel substructures as well. This article is focused on the development of mechanism with hybrid kinematic structure called Trivariant. This mechanism is similar to the well-known and succesful concept called Tricept, represented by various machines.

Keywords: parallel kinematic structure, hybrid kinematic structure, robot, Trivariant, control
Adobe Acrobat Download full version of the Paper (Adobe Reader Document, 1.65 MB)
 

SPECIFICATION ARCHITECTURE AND DEVELOPMENT OF RECONFIGURABLE MACHINE SYSTEM

MM (Modern Machinery) Science Journal, March 2011
S. Valencik
Abstract

The paper presents the base of knowledge from the field of architecture and development of reconfigurable machine system of producing and operating technique, including their formation to specific machine system in the accordance with strategy of development. The core of paper makes new approaches solutions, which results in the technical new conceptions of automatic structures, which are able to work in specific place.

Keywords: producing technique, operating technique, dynamic module, integrated kinematics
Adobe Acrobat Download full version of the Paper (Adobe Reader Document, 0.62 MB)
 

USING OF FEM FOR CHIP FORMATION AND CUTTING FORCE PREDICTION WHEN DRILLING TOOL STEEL AISI D3

MM (Modern Machinery) Science Journal, March 2011
P. Roud1, M. Zetek1, I. Cesákova1, J. Sklenicka1, P. Kozmin2
1 Department of Machining Technology,
University of West Bohemia, Pilsen, Czech republic
2Hofmeister, Pilsen, Czech republic
Abstract

This paper is focused on using FEM for design solid twist drill geometry. For this reason the series of numerical simulation have been conducted. The main observed parameters were chip shape and cutting forces. The results from numerical simulations were compared with experimental measurement.

Keywords: FEM, chip shape prediction, cutting force prediction, experiments
Adobe Acrobat Download full version of the Paper (Adobe Reader Document, 2.16 MB)
 

INFLUENCE OF THE TWIST DRILL GEOMETRICAL PARAMETERS ON MAGNITUDE OF CUTTING FORCES

MM (Modern Machinery) Science Journal, March 2011
J. Sklenicka, I. Cesákova
Department of Machining Technology, University of West Bohemia,
Pilsen, Czech Republic
Abstract

The article is focused on decomposition of cutting forces on cutting elements. The cutting forces are described via geometrical parameters of the twist drill. In the course of experiments magnitude of the feed force and the torque were measured. The shape of the chip was the next evaluated parameter.

Keywords: twist drill, cutting element, tool geometry, cutting element, measuring
Adobe Acrobat Download full version of the Paper (Adobe Reader Document, 2.06 MB)