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2_Asgmnt#2(Ans)_Sem I (2012-13)

2_Asgmnt#2(Ans)_Sem I (2012-13) - FACULTI OF MECHANICAL...

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FACULTI OF MECHANICAL ENGINEERING UNIVERSITI MALAYSIA PAHANG BMM3643 (Sem I 2012/13) Assignment #2 1. a ) What are the reasons why the bulk deformation processes are important commercially and technologically? (6 marks) b ) Discuss why friction is one major consideration in bulk deformation processes. Explain how lubricant can improve proces performance. List minimum 4 types of lubricants used in bulk forming processes. (6 marks) Answer a ) Bulk deformation processes are important because; i) they are capable of significant shape change when hot working is used, ii) they have a positive effect on part strength when cold working is used, iii) most of the processes produce little material waste; some are net shape processes. b) Metal forming processes are characteristic of high pressures between two contacting surfaces. In hot forming processes these high pressures are accompanied by extreme temperatures. For these reasons friction is a serious consideration in metal forming processes. A certain amount of friction will be necessary for some forming processes, but excessive friction is always undesirable. Friction increases the amount of force required to perform an operation, causes wear on tooling, and can effect metal flow creating defects in the work. Where friction is involve lubricants can usually help. For some processes and materials no lubrication is used, but for many lubrication is applied to contacting surfaces to reduce friction forces. Lubricants used in industry are different depending upon the type of process, the temperature
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