Exercise 6 a) With plastic processing of blanks, the blanks get a permanent shape change. Mention examples of at least four plastic manufacturing processes. b) Name some products that can be made by mold rolling and thread rolling. c) How do you know if a metal part is forged or cast. Describe the characteristics you would have investigated. d) Explain the difference between cold rolling and hot rolling and why is the surface finish better on metals that are cold rolled compared to metals that are hot rolled.