Modern Machinery (MM) Science Journal, March 2011

THE DEVELOPMENT OF MECHANISM BASED ON HYBRID KINEMATIC STRUCTURE

V. Poppeova, J. Uricek, Vl. Bulej
Keywords: control | Trivariant | Robot | hybrid kinematic structure | parallel kinematic structure

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 advan (…)

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

J. Sklenicka, I. Cesákova
Keywords: Measuring | tool geometry | cutting element | twist drill

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.

SPECIFICATION ARCHITECTURE AND DEVELOPMENT OF RECONFIGURABLE MACHINE SYSTEM

S. Valencik
Keywords: integrated kinematics | dynamic module | operating technique | producing technique

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 w (…)

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

P. Roud, M. Zetek, I. Cesákova, J. Sklenicka, P. Kozmin
Keywords: experiments | cutting force prediction | chip shape prediction | FEM

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.