Semi-manufactured parts dedicated for precise machining often have internal stresses which have remained after previous cutting and plastic processing. These stresses reside in a fixed state of balance over the entire volume of the workpiece. Removal of the machining allowance is associated with a change in the state of balance and deformation of the workpiece, which affect its dimensional and shape accuracy. The study, involving non-stress removal of precisely defined volume of the machining allowance and determination of the impact of this treatment on the deformation of the workpiece surface is presented. It is important from the point of view of dimensional tolerance of the axially symmetrical workpiece, finally processed by turning.

The article focuses on analysis of the effects cutting parameters on the surface roughness and shape errors. Research was performed for longitudinal turning of hardened steel 145Cr with using ceramic tools of different nose radius. Shape deviations and roughness for machined surfaces ware determined. Results were analysed and conclusions were presented.

In the article, there were processed the results of simulation-comparison studies of stress and deformation states of a polymetallic, 5-edge milling head CoroMill 290, of company Sandvick Coromant, in the synchronous and conventional milling of steel surfaces with various cutting depths.

Paper presents some investigations concerning FEM simulation analysis and optimization of turning process of the external engine block surface. As a part of examinations carried out, selected turning operation of upper flanges were analyzed. These concerned facing, external and internal turning. To conduct the feed speed optimization process a force model was built which enabled to calculate cutting forces values depending on cutting parameters. The optimization research had the aim to stabilize the time course of value of cutting forces taking place during machining.