Fib the time period, if pure rolling is the condition

Name, draw a neat sketch and explain why each of the following designs of rolling mill are used instead of a basic two high rolling mill. i) ii) A mill consisting of four roller A mill consisting of six or more rollers

3XPL@!N THE PROCESS @ND PROVIDE EXAMPLES FORMING OPERATIONS 1. Forging is mechanically working or deforming a single piece of a usually hot metal; this may be accomplished by the application of successive blows or by continuous squeezing.   2. Rolling, the most widely used deformation process, consists of passing a piece of metal between two rolls; a reduction in thickness results from compressive stresses exerted by the rolls.   3. Extrusion, a bar of metal is forced through a die orifice by a compressive force that is applied to a ram; the extruded piece that emerges has the desired shape and a reduced cross-sectional area.   4. Drawing is the pulling of a metal piece through a die having a tapered bore by means of a tensile force that is applied on the exit side.

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In rolling process 40mm thick plate is rolled to 20mm in two high rolling mills. Roll diameter is 200mm the angle of contact is 15degree. Determine no of roll passes required to obtain final desires thickness

Please provide answer both , no need to explain only give correct answer

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