MM Science Journal, October 2009

Comparison of Performance of Austrian made Si3N4 – Nitride Ceramic Tools Used to Machine Grey Cast Iron Work-piece Materials

J. Kovalcík, J. Cuban
Keywords: Metal machining | ceramic inserts | grey cast iron | work-piece material | tool life | Taylor’s logT-log v regression lines | trends and quantities | statistical anylyses

This article presents comparisons of cutting performance of Austrian made – Si3N4 nitride ceramic – inserts used in machining a Type 422425 grey cast iron work-piece materials. Three commercial ceramic inserts Type FMG121C, FMG122C, and FMG134C were tested. Experiments were focused on tool life tests. A comparison approach involved exponents of Taylor’s type equations over an optimized cutting tool (…)

Drive Based Vibration Reduction for Production Machines

A. Dietmair, A. Verl
Keywords: Machine Vibration | Active Damping | Control Algorithms

Machine vibrations constitute a persistent challenge for high performance and high precision production machines that show resonant behaviour at some frequencies. Most remedies require additional actuators or precise knowledge of the dynamic behaviour of the machines under consideration. To overcome this limitation, we present several techniques that use the feed drives to dampen vibrations or avoi (…)

Automatized system of measuring and regulation in turning operations

R. Krehel
Keywords: Cutting | sensor | workpiece | component | optical | scanning | measurement

A novel approach to the simulation of the dimensional wear of cutting tools with a subsequent element of correction in limit boundaries of parametrically determined optimal shifts is presented and discussed. Described in details is, however, only one aspect belonging to the polynomial transform of experimentally found discrete values of the cutting point positions to a continuous functional form, c (…)

Virtual animation for checking interference of globoidal cam

Nguyen Van Tuong, Premysl Pokorny
Keywords: modeling | animation | interference | globoidal cam | follower

This article proposes some important tasks which are necessary in the modeling procedure of globoidal cams. These tasks are modeling and virtual animation of the globoidal cam mechanism for checking interference between components of the system. The acceptable cam is the one that has no interference between the cam and its rollers assuming that the clearance between cam surfaces and roller is zero (…)