Strona: Vol. 41, No. 2, 2017 / Advances in Manufacturing Science and Technology

A NEW ASPECTS OF HARD MACHINING USING CBN TOOLS WITH VARIABLE TOOL CORNER RADIUS AND TOOL WEAR EFFECT

Wit Grzesik, Krzysztof Żak

Abstract:

In this paper some important mechanical cutting characteristics such as cutting forces, specific cutting energy and cutting power were determined when finish turning of hardened 41Cr4 alloy steel and AISI 52100 and JIS-SUJ2 bearing steels using CBN tools with variable tool corner radius based on the experimental study and literature data. The tool corner radius was varied from 400 to 2400 ?m and, in addition, flank wear effect was taken into account. Moreover, surface roughness produced by CBN tools with different tool corner radius was compared and surface finish obtained was characterized in terms of potential functional performance. As a result, the changes of Ra and Rz roughness parameters and relevant material distribution curves and bearing parameters in the form of Symmetrical Curve of Geometrical Contact (SCGC) are presented. 

Keywords: hardened steel, tool corner radius, cutting force, specific cutting energy, cutting power, surface roughness

ARTICLE (PDF)

ANALYTICAL STUDIES OF STATIC STIFFNESS OF CARRYING SUBSYSTEM SADDLE-TABLE OF MACHINE TOOL

Beata Niesterowicz, Daniel Jastrzębski

Summary:

The paper demonstrates results of analytical researches on carrying subsystem of machine tool in designation of its static stiffness characteristics. Varied kinds of models that differ in solid structure simplifications have been considered. The aim of researches was to find effective, considering designing needs, modeling methods of this subsystem and an attempt to formulate general recommendations in terms of analysis and modeling of carrying subsystems of machine tools. 

Keywords: analytical MES researches, carrying system of machine tool, stiffness characteristics

ARTICLE (PDF)