lec9a - Bulk Bulk Processes - Rolling Lecture 9.a ISE 2204...

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Bulk Processes Bulk Processes - Rolling Rolling Lecture 9.a ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio March 17 th , 2009 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. ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Rolling Operations Schematic outline of various flat- rolling and shape-rolling operations. Source: American Iron and Steel Institute.
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Plates-defined by a thickness of more than 6 mm (1/4 in) Sheets-defined by a thickness of less than 6 mm Foils-the thickness is 0.008 mm h - original strip thickness that enters roll gap h o original strip thickness that enters roll gap h f -final strip thickness V r -speed of the rolls V o -entry velocity of the strip V f -final velocity of the strip Gage number: Identifies the thickness of the sheet metal. The smaller the number the greater the ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Common Terms in Rolling thickness. The cast material is first hot rolled to remove defects and convert cast structure to a wrought structure. The product of first rolling operation is called a bloom or slab or billets . The surface of hot rolled materials are first treated or conditioned to remove surface scales before cold rolling into required shapes and thickness. Level rolls are used to maintain flatness of rolled sheet. ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Grain Structure in Hot Rolling Change sintheg ra ins t ru c tu reo fme ta l sdu r ingho tro l l ing .Th i si sane f fe c t ive method to reduce grain size and refine the microstructure in metals, resulting in improved strength and good ductility.
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Schematic illustration of the flat-rolling process. (Note that the top roll has been removed for clarity.) Relative velocity distribution between roll and strip surfaces. The arrows represent the frictional forces acting along the strip-roll interfaces. Note the difference in their direction in the left and right regions.
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lec9a - Bulk Bulk Processes - Rolling Lecture 9.a ISE 2204...

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