Rake angle

At this focus level, it has been shown that in machining, the ideal process energy is independent of operating parameters such as tool speed, feed and depth of cut [40], Instead the machining energy is dependent on setup parameters, such as choice of cutting fluid, tool rake angle and... 

The role of theory is to determine the conditions of h, c, tool geometry (rake angle), and work material thermo-physical-mechanical properties that give rise to serrated rather than continuous or other classifications of chips and, in the conditions of serrated chip formation, to predict such measurable features of the serration as the maximum and minimum chip thickness hi and h2, the angle 0 at which the saw teeth are inclined to the back face of the chip, the teeth face separation L, and the shear-band width . If such quantities are predicted, then the cycles of temperature and stress in the tool will also be known. 

Table 1 lists, for a range of metals of interest to machining and from published literature, experimentally observed minimum values of the product of h and v. for serrated chip formation due to adiabatic shear localization. They are to be regarded only as indicative as in fact they depend on rake angle, a factor not considered in collecting material for the table and on material heat treatment, sometimes not recorded in the literature. Furthermore, transitions from one chip form to another are not sharp. 

Fig. 4 Chip forms for a Ti-6A1-4V alloy, tool rake angle —6°, and scale bars 100 mm (From original work of J. Barry, see Acknowledgments)...

Hashimura M, Hassamontr J, Domfeld DA (1999) Effect of IN-plane exit angle and rake angles on burr height and thickness in face milling operation. J Manuf Sci Eng 121(1) 13-19... 

Cutting tool geometry (tool orthogonal rake angle)... 

The values for specific pressure u are normally obtained through orthogonal metal-cutting experiments. Specific pressure is related to and correlates well with shear stress r, for a given metal. The unit power is sensitive to material properties (e.g., hardness), rake angle, depth of cut, and feed, whereas is sensitive to material properties only. Specific power can be used to estimate the motor power required to perform a machining operation for a given material. 

Y rake angle a clearance angle shear angle deforrrration depth... 

The shear strain (not to be mixed up with rake angle y) therefore is (Fig. 9)... 

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