Unit 6c

False (B)

Compressive stresses

<p>ductility</p> Signup and view all the answers

<p>Rolling = Significant thickness reduction Forging = Shape production through die impacts Extrusion = Pushing material through a die Wire and bar drawing = Reducing diameter of metal rods and wires</p> Signup and view all the answers

<p>To create components by reshaping metal (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Parts that are extruded from a metal forming process.</p> Signup and view all the answers

<p>pulled</p> Signup and view all the answers

<p>Bending = Reshaping metal into curves or angles Deep drawing = Forming cup-shaped parts Cutting = Dividing metal into parts Rolling = Reducing thickness using rollers</p> Signup and view all the answers

<p>Deep drawing (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Punch and die</p> Signup and view all the answers

<p>About one-half of melting point (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Yield strength increases and ductility decreases</p> Signup and view all the answers

<p>0.6Tm</p> Signup and view all the answers

<p>Lower forces and power required = Hot Working Increased yield strength = Cold Working No work hardening occurs = Hot Working Higher dimensional accuracy = Cold Working</p> Signup and view all the answers

<p>No heating of work required (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Annealing</p> Signup and view all the answers

<p>melting</p> Signup and view all the answers

<p>Cold Working = Performed at room temperature or slightly above Warm Working = Lower forces than cold working, reduced need for annealing Hot Working = Performed at elevated temperatures to reduce force requirements</p> Signup and view all the answers

<p>Higher forces required (D)</p> Signup and view all the answers

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

<p>Lower forces required</p> Signup and view all the answers

Changing a metal's shape using plastic deformation.

Permanent shape change in a material without breaking.

Low yield strength and high ductility are ideal for metal forming.

Significant shape change in large metal workpieces.

Stress level at which a material begins permanent deformation.

A metal forming process where a metal is hammered or pressed into a specific shape using dies.

A metal forming process carried out at room temperature or slightly above, resulting in high strength and hardness.

A metal forming process performed at a temperature above room temperature but below recrystallization temperature.

Metal forming process carried out at a high temperature, where metal flows easily.

The temperature at which a metal's internal structure changes due to heat, making it softer.

Benefits of cold working include increased strength and hardness, good surface finish, and requiring no heating.

Cold working requires high force, limits deformation, and may require annealing to continue forming.

A metal forming process that deforms thin metal sheets into desired shapes. It utilizes operations like bending, deep drawing, and cutting to create components with high surface area-to-volume ratios.

A metal forming process that involves deforming a sheet metal into a desired angle or curve. It often uses a bending tool to apply force and create a desired shape.

A process that uses a punch and die to deform a sheet metal blank into a hollow shape. This is often done using a press machine, hence the term 'pressworking'.

A process that uses a punch and die to cut out specific shapes or patterns from a sheet metal. The resulting parts are called stampings.

A process that uses rollers to reduce the thickness of metal sheets or bars by applying pressure. This is done to achieve specific dimensions and can be performed hot or cold, depending on the desired results.

A process where a metal billet is forced through a die to create a desired cross-sectional shape. The resulting extruded parts are called 'extrudates' and are pushed out using a press.

A process where metal stock is pulled through a die of smaller cross-sectional area, leading to a reduction in the stock's diameter. This is similar to extrusion, but the force is applied by pulling the metal through the die.

The temperature at which metals are deformed during hot working, above the recrystallization temperature.

Hot working produces materials with uniform strength properties in all directions.

High temperatures during hot working cause the metal surface to react with oxygen, forming a layer of oxide.

Cold working increases the yield strength of the material, making it harder to deform.

Cold working decreases the ductility of the material, making it less able to deform without breaking.