me_350_-_lect_17_-_ch_19.20091022.4ae1186230a033.67198361

me_350_-_lect_17_-_ch_19.20091022.4ae1186230a033.67198361 -...

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BULK DEFORMATION PROCESSES IN METALWORKING 1. Rolling 2. Forging 3. Extrusion 4. Drawing ME 350 – Lecture 17 – Chapter 19
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Rolled Products Made of Steel
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Diagram of Flat Rolling Draft = thickness reduction: Conservation of Volume:
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Diagram of Flat Rolling There is a point on the roll where the work velocity equals the roll velocity , this is the Friction is in on either side of this point. Forward slip: where, Maximum draft: Roll force:
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Rolling Issues: With Hot rolling, material properties are isotropic , but dimensional tolerances are not as tight, and scale (surface oxidation) occurs. In hot working the material can be considered perfectly plastic, n = and Y f = To reduce the power required to roll: 1. Change temperature: 2. Change roller radius: 3. Change rolling speed:
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Shape Rolling Work is deformed into a contoured cross section rather than flat (rectangular) Accomplished by passing work through rolls that have the reverse of desired shape Products include: Construction shapes such as I‑beams, L‑beams, and U‑channels Rails for railroad tracks Round and square bars and rods
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Thread Rolling Bulk deformation process used to form threads on cylindrical parts by rolling them between two dies Performed by cold working in thread rolling machines Advantages over thread cutting (machining): production rates: material utilization: threads strength:
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Forging Deformation process in which work is compressed between two dies Oldest of the metal forming operations, dating from about 5000 B C Components: engine crankshafts, connecting rods, gears, aircraft structural components, jet engine turbine parts Also, basic metals industries use forging to establish basic form of large parts that are subsequently machined to final shape and size
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Types of Forging Dies Open‑die forging - work is compressed between two flat dies, allowing metal to flow
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This note was uploaded on 01/15/2010 for the course ME 350 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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me_350_-_lect_17_-_ch_19.20091022.4ae1186230a033.67198361 -...

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