Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 703

NOMOGRAM FOR CALCULATING THE WORKING GEOMETRY OF MILLING TOOL

The exiting of the cutting edge from the cut is also accompanied by The average chip thickness h depends on the type of milling cutter thermal stress, caused by a rapid reduction in temperature of the sur- and the cutting conditions, especially on the relation ma /DC, feed per face layer of the cutting edge and mechanical stress caused by elastic tooth f and the setting angle KAPR – k . See picture on the next page e

deformation relief of the surface layer of workpiece at a rapid drop for an illustrative example.z r

in cutting force. That is why we use the average value of chip thickness h for any calculations. m The chip thickness h fluctuates during one revolution depending on

angle j in accordance with the formula hj = f × sinj. The maximum chip thickness equal to f is reached at the axis of the z milling cutter. The average chip thickness zh cut by one tooth during one revolution is equal to the height of the rectangle of the same area m as the area under the sine curve relates to the radial depth of cut a . e