Homework%204%20solution - IE 370 Homework 4 Due Nov 5th....

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IE 370 Homework 4 Due Nov 5th. Name and ID 1. Why friction is such an important parameter in metal working operations? A n s : In most cases, we want to econom ically reduce the effects of friction. However som e deformation processes such as rolling can only operate w hen sufficient friction is present. And friction under metalworking conditions is significantly different from the friction encountered in m ost mechanical devices. 2. Indicate 5 advantages of cold working relative to warm and hot working. Ans: 1. Better accuracy, closer tolerances 2. Better surface finish 3. Strain hardening increases strength and hardness 4. Grain flow during deformation can cause desirable directional properties in products 5. No heating of work required 3. What are the advantages and disadvantages of hot working? Advantages: 1. Workpart shape can be significantly altered 2. Lower forces and power required 3. Metals that usually fracture in cold working can be hot formed 4. Strength properties of products are generally isotropic
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This note was uploaded on 07/06/2011 for the course PHIL 330 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Homework%204%20solution - IE 370 Homework 4 Due Nov 5th....

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