Piotr Cichosz

Impact of smoothing conditions on the rounding effect of cutting edges of cemented carbide machining blades

For several years, the rounding of the edges of the carbide cutting blades has been applied, which improves the durability of the tools. Therefore, many design solutions were developed for smoothing the abrasive edge [2, 8-9]. They have been described in more detail in [2, 12]. Many leading global tool companies have introduced this technology, mainly in reference to monolithic carbide burrs and milling cutters [5-6, 10]. An additional benefit associated with the smoothing of the edges is the reduction of the surface roughness not only of the blades themselves, but also of the tool bodies. This in turn contributes to a better evacuation of the chips from the cutting zone, as well as the impact on the more effective appearance of the entire tool. A certain problem related to the smoothing of the edges can be the exact measurement of the radius of their rounding rn. A significant impediment to this measurement is the very small radius value, usually from several to several dozen micrometers [1-2, 4, 10, 13]. Metallographic samples made perpendicular to the edge can be used for the measurement. However, it is destructive and laborious. Frequently, advanced optical microscopes are used to measure the radii of the edge. They are very expensive, but necessary to control the complex smoothing process, in which many factors influence the machining effect. The aim of the work was to identify and assess the significance of factors that have the strongest influence on the geometric effects of smoothing and machining efficiency.

Cutting tools from super-hard materials Part II. Blades of regular boron nitride

The properties of super-hard materials such as diamond and regular boron nitride, and their application on cutting blades. Discussed are examples of blade tools from these materials in the aspects of production process efficiency and economical advantages gained by using these tools. The first part of the article deals with materials and tools with diamond blades and the other – with the blades of a regular boron nitride.