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213 Cold working process
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I am the Creator of #softwaretheses which is the software to help writing theses and research papers • -- • Thank you for subscribing to this channel • .. • You can support me by reading my books • -- • https://www.amazon.com/author/ahmadhu... • -- • These are the lecture contents for this vides • -- • Slide 1: Introduction to Cold-Working • Cold working: Forming metal at a low temperature, typically room temperature. • Compared to hot working: • Produces brighter finishes. • Results in higher accuracy with minimal machining. • Examples of cold-working methods: • Cold rolling: Used for sheets and flats. • Cold drawing: Used to reduce bar size. • Advantages: Improved surface finish, better dimensional control. • Example: Cold-rolled steel sheets used in automotive body panels due to their smooth finish and high precision. • • Slide 2: Cold Rolling and Cold Drawing • Cold rolling: Primarily used for wide flats and sheets. • Cold drawing: • Hot-rolled bars are cleaned, then pulled through a die, reducing their size without material loss. • Used for creating precise bars and shafts. • Mechanical properties: • Both cold rolling and cold drawing increase yield and ultimate strength, along with hardness. • Example: Precision shafts used in mechanical assemblies are commonly cold drawn to ensure tight tolerances. • • Slide 3: Effects on Material Properties • Cold working distorts grain structure without changing grain size. • Key effects: • Increased yield strength and hardness. • Decreased ductility (less ability to deform without breaking). • Fig. 2–12: Comparison of cold-drawn vs. hot-rolled bar properties. • Example: Cold-worked steel is often used in structural applications where high strength and rigidity are needed. • • Slide 4: Specialized Cold-Working Processes • Heading: Upsetting or gathering metal, often used for making screw and rivet heads. • Roll threading: Forming threads by squeezing a blank between dies. • Spinning: Working sheet metal into circular shapes on a rotating form. • Stamping: Includes blanking, coining, forming, and shallow drawing, commonly used in mass production. • Example: Threaded bolts and fasteners are made using roll threading, ensuring strong and precise threads without cutting.
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