ME364 MET KS Ch21

# ME364 MET KS Ch21 - Chapter 21 Fundamentals of Machining 1...

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1 Chapter 21 Fundamentals of Machining

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2 Common Machining Operations Figure 21.1 Some examples of common machining operations.
3 The Turning Operation Figure 21.2 Schematic illustration of the turning operation showing various features.

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4 Two-Dimensional Cutting Process Figure 21.3 Schematic illustration of a two-dimensional cutting process, also called orthogonal cutting: (a) Orthogonal cutting with a well-defined shear plane, also known as the Merchant Model. The tool shape, depth of cut, t o the cutting speed, V , are all independent variables, (b) Orthogonal cutting without a well- defined shear plane.
5 Factors Influencing Machining Operations

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6 Mechanics of Cutting Cutting ratio, r = t o t c = sin φ cos φ-α ( 29 Shear angle preditions: φ= 45 °+ α 2 - β 2 45 °+ α-β Velocities, V c = V sin cos ( 29 β is friction angle, μ is friction coefficient μ = tan β V c : chip velocity, V : cutting speed, V.t o = V c . t c (mass continuity) V c = V r
7 Chip Formation by Shearing Figure 21.4 (a) Schematic illustration of the basic mechanism of chip formation by shearing. (b) Velocity diagram showing angular relationships among the three speeds in the cutting zone.

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8 Chips Produced in Orthogonal Metal Cutting
9 To reduce tendency for built-up edge (BUE) : Increase cutting speed, Decrease depth of cut, Increase rake angle, Use a sharp tool, Use an effective cutting fluid, Use a tool with lower chemical affinity for the workpiece material.

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Chip Breaker Figure 21.7 (a) Schematic illustration of the action of a chip breaker. Note that the chip breaker decreases the radius of curvature of the chip and eventually breaks it. (b) Chip breaker clamped on the rake face of a cutting tool. (c) Grooves in cutting tools acting as chip breakers.
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## This note was uploaded on 11/17/2009 for the course MECHANICAL ME 364 taught by Professor Prof.dr.abdülkerimkar during the Spring '08 term at Yeditepe Üniversitesi.

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ME364 MET KS Ch21 - Chapter 21 Fundamentals of Machining 1...

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