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ME364 MET KS Ch13 - Chapter 13 Rolling of Metals 1 FORMING...

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1 Chapter 13 Rolling of Metals
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2 FORMING and SHAPING FORMING : Changing the shape of existing solid body (called workpiece, stock, blank). Starting with a shape of a plate, bar, rod, wire etc. rolling, forging, extrusion, etc. SHAPING : Molding or casting of soft or molten materials. Finished product is near the final desired shape. Casting, polymer processing,
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3 ROLLING is the process of reducing the thickness or changing the cross-section of a long workpiece by compressive forces applied through a set of rolls. Rolling first is carried out at elevated temperatures ( hot rolling ). During this process grain size becomes finer with enhanced properties. Then rolling is carried out at room temperature ( cold rolling ). Rolled product has higher strength, hardness and surface finish.
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4 Flat-Rolling and Shape-Rolling Processes Figure 13.1 Schematic outline of various flat- rolling and shape-rolling processes.
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5 Flat-Rolling Process Figure 13.2 (a) Schematic illustration of the flat-rolling process. (b) Friction forces acting on strip surfaces. (c) Roll force, F , and the torque, T , acting on the rolls. The width of the strip, w , usually increases during rolling.
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6 Maximum possible draft: h o - h f = μ 2 .R R: roll radius, μ : friction coeff between roller and strip, Roll force: F = L.w.Y avg L: Roll-strip contact length, w: width of strip Y avg : average true stress= ( unstrain true stress+ true stress ( ε ))/2 ε : true strain = ln (h o / h f ) Increase F by 20% to account friction .
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