63. What are the two basic types of forging equipment? 64. What is extrusion? Distinguish between direct and indirect ex

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63 What Are The Two Basic Types Of Forging Equipment 64 What Is Extrusion Distinguish Between Direct And Indirect Ex 1 (152.04 KiB) Viewed 29 times

63. What are the two basic types of forging equipment? 64. What is extrusion? Distinguish between direct and indirect extrusion. Name some products that are produced by extrusion. 65. Why is friction a factor in determining the ram force in direct extrusion but not a factor in indirect extrusion? 66. What does the center burst defect in extrusion have in common with the roll piercing process? 67. What is wire drawing and bar drawing? 68. 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? 69. In a wire drawing operation, why must the drawing stress never exceed the yield strength of the work metal? 70. Identify the three basic types of sheet metalworking operations. 71. In conventional sheet metalworking operations, (a) what is the name of the tooling and (b) what is the name of the machine tool used in the operations? 72. In blanking of a circular sheet-metal part, is the clearance applied to the punch diameter or the die diameter? 73. What is the difference between a cutoff operation and a parting operation?