Open AccessNow that there is a need to increase a processing capacity, curved cutting edge mills find ever-growing use. Also known as “rough end”, “full-side”, and “heavy-duty” mills, they provide the increased depth and width values of milling owing to the width-sized chip separation. The analysis of produced mills allowed us both to reveal their basic design components (type of a shaft or basic opening, diameter and length of the cutting part, mill length, quantity of teeth, a tilt angle of a screw flute) and to make their classification. The paper presents a classification of the profile types of cutting edges, which can be divided by form (flat, round), size (small, large, super-large), and symmetry (symmetrical and asymmetrical). The profile of the cutting edge is characterized by the following parameters: profile height, pitch of crests spherical radius of crest.
A review of the curved cutting edge profile types allows us to build the geometrical constructions to define a form and the sizes of the chip load made by the cutting edge from a billet. It is shown that parameters of the cutting edge profile influence the form and the sizes (thickness and width) of the chip load.
The chip load thickness provided by the curved cutting edge mills exceeds that of observed when using the “smooth” cutting edge mills. A thickening degree of the chip load is changed with changing form and sizes of the cutting edge mill profile. Larger thickening is observed if the chip load is limited from below and from above by the marks of a single tooth (the first or second etc.), and a length of the other teeth marks is minimum. The most achievable chip load thickness is equal to feed per revolution.
Studying the references allowed us to formulate some rules to choose a cutting edge profile depending on a type of the processed material and a desirable roughness of the processed surface. It is important to note the following.
When choosing a profile of the cutting edge it is possible to be guided by the rule: as a hardness of the processed material increases and a desirable roughness of the processed surface decreases it is necessary to use mills with a profile of the smaller height and pitch.