Get ASM Handbook: Volume 16: Machining PDF

By Joseph R. Davis

ISBN-10: 0871700220

ISBN-13: 9780871700223

Are you trying to find superior productiveness and potency? Get particular descriptions of particular machining and grinding tactics, guidance for correct choice of slicing instrument fabrics and slicing fluids, and suggestions during this quantity, which positive aspects 1,300 illustrations and 620 tables.

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Extra resources for ASM Handbook: Volume 16: Machining

Sample text

Materials with little prior strain hardening will extend their boundaries farther out from the tool tip. Stresses on the Shear Plane. Consistent with the assumptions in the section "Forces" in this article, the shear plane is generally modeled to have uniform distributions of both shear and normal forces over its entire area. The shear area, As, is the area of cut (Ac = t · w) inclined at the shear angle . Thus, the shear area is: (Eq 16) The shear stress on the shear plane can then be calculated as follows: (Eq 17) and the normal stress can be computed similarly as: (Eq 18) Therefore, the stresses rely only on measured cutting forces (Fc and Ft), the geometry of the cut (t and w), and the deformation geometry ( ).

Because of the high interface temperatures and pressures, the material adjacent to the tool surface is almost stationary, and relative shearing takes place in the chip. As originally developed by Zorev (Ref 14) and consistent with the empirical results presented, the stresses on the rake face are inherently nonlinear, as shown in Fig. 5. The normal stress is assumed to take on a maximum value, max, at the tip of the tool; the stress then decreases as a power function of the distance from the tool tip to the point at which the chip leaves the tool (Fig.

2 Stresses in the workpiece The distance of the elastic-plastic boundary from the tool tip will depend on tooling parameters, cutting parameters, and workpiece material properties. In particular, the amount of prior strain hardening and the ability of the workpiece material to work harden will alter the magnitude of the stresses in the workpiece and will affect the placement of the elastic-plastic boundary. Materials with little prior strain hardening will extend their boundaries farther out from the tool tip.

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