In: Mechanical Engineering
12. What is forging? 13. One way to classify forging operations is by the degree to which the work is constrained in the die. By this classification, name the three basic types. 14. Why is flash desirable in impression die forging? 15. What is a trimming operation in the context of impression die forging? 16. What are the two basic types of forging equipment? 17. What is isothermal forging? 18. What is extrusion? 19. Distinguish between direct and indirect extrusion. 20. Name some products that are produced by extrusion 21. Why is friction a factor in determining the ram force direct extrusion but not a factor in indirect extrusion 22. What does the centerburst defect in extrusion have in common with the roll piercing process? 23. What is wire drawing and bar drawing? 24. Although the workpiece in a wire drawing operation is obviously subjected to tensile stresses, how do compressive stresses also play a role in the process? 25. In a wire drawing operation, why must the draw stress never exceed the yield strength of the metal?