MM Science Journal, December 2009

INVESTIGATION OF MACROSCOPIC RESIDUAL STRESSES DISTRIBUTION AFTER PROGRESSIVE MACHINING OF TOOL STEELS

K. Kolarik, N. Ganev, Zd. Pala, J. Barcal, T. Bakalova, M. Svanter
Keywords: X-ray diffraction | residual stress | high speed cutting | electro discharge machining

HSC (High Speed Cutting) and EDM (Electro Discharge Machining) belong to the progressive and harsh machining operations. They differ markedly in the manner of material removal and, consequently, in the process of a final surface formation. While HSC represents the so called chip machining, EDM embodies a utilization of controlled thermal material reduction. With respect to the usage of these techno (…)

Machine Tool Virtual Model

J. Vesely, M. Sulitka
Keywords: Machine tools | Virtual Prototyping | Feed drive optimization | Feed drive dynamic properties | Feed drive complex modelling

Machine tool development for high speed and highly precise cutting demands employment of advanced simulation techniques, which can enable already in the machine tool design phase to model the feed drive dynamic properties and feed drive control. The paper describes the current state of feed drive complex models development in the RCMT. Influence of an appropriate approach to machine frame structure (…)

MACROSCOPIC RESIDUAL STRESSES IN STEELS GROUND UNDER VARIOUS CONDITIONS OF HEAT REMOVAL

Zd. Pala, N. Ganev, K. Kolarik
Keywords: grinding | cooling | residual stress | X-ray diffraction | electro-chemical polishing

Macroscopic residual stresses on the surface and their depth distributions in steels ground in various cooling environments represent the central issue of this contribution. The specimens were manufactured from three ferrous materials – carbon steel C45, low carbon Mn-Cr steel 16MnCr5 and corrosion-resistant chromium steel M300, and consequently ground with face grinding machine and corundum wheel (…)

NUMERICAL AND EXPERIMENTAL ANALYSIS OF RESIDUAL STRESSES INDUCED BY CONTACT LOADING

R. Halama, M. Fusek, J. Valíček
Keywords: residual stress | plasticity | contour method | FEM | rolling contact fatigue

The paper deals with numerical and experimental solution of residual stresses, which occurs due to a contact loading. The first solved case corresponds to frictionless contact in an indent test accepted from literature. In the finite element analysis, three material options with isotropic, kinematic and combined hardening were tested. The model of Calloch and Marquis, which was implemented into the (…)