Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 703

Предыдущая страница Следующая страница

Навигация

9 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 hm 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 ae/DC, feed per face layer of the cutting edge and mechanical stress caused by elastic tooth fz and the setting angle KAPR – kr. See picture on the next page deformation relief of the surface layer of workpiece at a rapid drop for an illustrative example. in cutting force. That is why we use the average value of chip thickness hm for any calculations. The chip thickness h fluctuates during one revolution depending on angle j in accordance with the formula hj = fz × sinj. The maximum chip thickness equal to fz is reached at the axis of the milling cutter. The average chip thickness hm cut by one tooth during one revolution is equal to the height of the rectangle of the same area as the area under the sine curve relates to the radial depth of cut ae. 702