Metal Forming: Rolling Process Overview

Blooms, billets, and slabs

Hot rolling is performed above the recrystallization temperature, while cold rolling is done below it.

<p>A process where a block of metal is squeezed between two rollers (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Two-high non-reversing mill = Simplest design where material passes in one direction Two-high reversing mill = Allows back-and-forth rolling, with rolls stopping and reversing between passes Three-high mill = Eliminates the need for roll reversal but requires elevators and manipulators for material and product handling Four-high mills = Utilize backup rolls to support smaller work rolls and are often used for hot rolling of wide plates and sheets Cluster arrangements = Use numerous backup rolls to support smaller work rolls, widely employed for rolling thin materials like foil</p> Signup and view all the answers

<p>It is crucial for the plastic deformation of the metal. (D)</p> Signup and view all the answers

<p>Manipulation of the metal across rollers. (B)</p> Signup and view all the answers

<p>Cold rolling occurs at or near room temperature. (C)</p> Signup and view all the answers

<p>To optimize the thickness and geometry of the final product. (D)</p> Signup and view all the answers

<p>The dimensions and shape of the material before rolling. (C)</p> Signup and view all the answers

A deformation process in which the thickness of a workpiece is reduced by compressive forces applied by two rotating rolls.

A rolling operation where a rectangular cross-section is reduced in thickness.

A rolling operation where a square cross-section is transformed into a specific shape, like an I-beam or V-shape.

A rolling mill with two rolls that only allow material to pass in one direction.

A rolling mill with two rolls that can be reversed, allowing material to be rolled back and forth.

A rolling mill with three rolls that eliminates the need for roll reversal, using elevators and manipulators to move the material.

A rolling mill where smaller work rolls are supported by larger backup rolls to ensure precise thickness control.

A rolling mill with a cluster of backup rolls supporting the smaller work rolls, used for very thin materials like foils.

A rolling mill where a central main roll is surrounded by smaller rolls, enabling efficient rolling of large diameter parts.

A series of rolling stands in sequence, allowing for multiple passes and continuous product processing.

Rolling carried out above the recrystallization temperature of the metal, allowing for significant deformation and grain refinement.

Rolling carried out below the recrystallization temperature of the metal, resulting in increased strength and hardness but reduced ductility.

The ability of a material to deform permanently without breaking.

The ability of a material to resist deformation under stress.

The resistance of a material to scratching or abrasion.

The stress at which a material begins to deform permanently.

The maximum stress a material can withstand before breaking.

A type of stress-strain diagram where the yield point is not clearly defined, instead using an offset line to determine the yield stress.

A material that breaks under relatively low stress and little deformation, showing little elongation.

The region of the stress-strain diagram where the material undergoes permanent deformation.

A measure of how much stress a material can withstand at a given strain.

The average stress over a given strain range, calculated by integrating the flow curve equation.

A rectangular cross-section metal shape, typically larger than 6 inches by 6 inches, used for structural shapes like I-beams.

A square cross-section metal shape, typically between 1.5 inches by 1.5 inches and 6 inches by 6 inches, used for bars and rods.

A rectangular cross-section metal shape, typically larger than 10 inches by 1.5 inches, used for plates, sheets, and strips.

A rolling process where a cylindrical rod is deformed into a ring shape, often used for bearings.

A rolling process used to create threads on a rod by pressing the rod between two dies.

A rolling process where a sheet is rolled into a tube shape, often used for pipes and tubes.

Threads formed by cutting, leaving sharp edges and sometimes burrs.

Threads created by rolling, resulting in a smoother surface without sharp edges.

Rolling is a deformation process where the thickness of a material is reduced by compressive forces applied by rotating rolls. The process is versatile and is used to make various shapes and sizes of metal products.

Flat rolling involves reducing the thickness of a rectangular-shaped metal to create sheets or plates.

In shape rolling, metal with a square cross-section is deformed into a specific shape, such as an I-beam or V-shape. This involves carefully designed rolls that create the desired cross-section.

Hot rolling is performed above the recrystallization temperature of the metal. It allows for significant deformation and grain refinement, resulting in a stronger and tougher final product. The high temperature makes the material more malleable.

Cold rolling occurs below the recrystallization temperature of the metal, resulting in increased strength, hardness, and reduced ductility. It enhances the metal's surface finish and dimensional accuracy.