INTENSITY OF IMPACT LOAD AND FORCE IMPACT WHEN CUTTINGBY THE END-MILLING TOOL

Abstract

The results of theoretical studies of the number of impacts influence, the intensity of the impact load and the
force effect when cutting with an end-milling tool in the conjunction with the kinematic movement of such a milling
tool tooth are presented. It is shown that the operating conditions of the end milling tool are very unstable, having
a pronounced intermittent character, not only within one revolution of the tool, when the cutting tooth is either in contact
with the material being processed, or outside it, but also within one cut. To increase the resource of this tool, it is necessary
to improve the special properties of high-speed steels structure used for the manufacture of such tools, capable of
withstanding unstable, intermittent cutting loads. It has been established that the cutting conditions, according to the
criterion of the number of strokes, by the end-milling tool, significantly, twice, differ during the plunge and the established
cutting process, compared with the exit from the cutting process. The intensity of the impact load on the end milling tool
tooth for one cut during insertion decreases from the maximum value to a constant value. It is presented during steady cutting, and then, when the tooth leaves the metal, it increases to the maximum value, and therefore, the worst cutting
conditions, with from the intensity of the impact load, there are areas during insertion and exit from it, which are sources of
additional instability of cutting process with an axial milling tool. With the help of mathematical modeling, it has been
found that the intensity of the change in the tangential component of the cutting force is uneven, differing from each other
at different angles of contact of the cutter tooth with workpiece up to 30 times.

Fig. 4. Ref.: 12 titles.