Advantages and disadvantages of hot working and cold working, Other Engineering

Q. Describe the advantages and disadvantages of hot working and cold working processes. Explain the extrusion process.

Ans. Advantages of hot working process

         (i)Due to refinements of grains, mechanical properties such as toughness, ductility, elongation and reduction in area are improved.

(ii) Great latitude in shape and size of farm is possible to reduction of elastic limit.

(iii) The power required to finish the part from ingot is less.

(iv) Directional property resulting from a fiber structure is obtained.

(v) The strength and hardness decreases at elevated temperature.

Disadvantages of hot working process

(i) The life of the tools used is less.

(ii) Tooling and handling costs are high.

(iii) Close tolerances cannot be maintained, oxide films are surface characteristics.

Advantages of cold working process

(i) Surface finish is improved and close tolerance can be maintained.

(ii) Distortion or fragmentations of the grain structure is created.

(iii) Accurate dimensions of parts can be maintained.

(iv) Strength and hardness of the metal are increased but ductility is decreased.

(v) Resistance to corrosion is decreased while ultimate tensile strength, yield point and hardness are increased.

(vi) Loss of metal due to oxidation is prevented.

Disadvantages of cold working process

(i) The grain structure is not refined and residual stress have harmful effects on certain properties of metals.

(ii) Tooling costs are high and as such it is used when large quantities of similar components are required.

(iii) Only small size components can be easily cold worked as greater forces are required for large section.

Extrusion process : The process of extrusion consists of compression a metal inside a chamber to force it out through a small opening called die.

The extrusion process can be classified as :

(i) Direct or Indirect extrusion 

(ii) Forward or backward extrusion 

Posted Date: 8/3/2012 5:29:45 AM | Location : United States







Related Discussions:- Advantages and disadvantages of hot working and cold working, Assignment Help, Ask Question on Advantages and disadvantages of hot working and cold working, Get Answer, Expert's Help, Advantages and disadvantages of hot working and cold working Discussions

Write discussion on Advantages and disadvantages of hot working and cold working
Your posts are moderated
Related Questions
After five years, what is Judy’s total income (interest par) from each bond? Should she use this total as a way of deciding which bond to purchase?

Does the atmospheric pressure inside of a tube aproximately a half an inch in diameter cause resistance against an end plug being flash welded to the end of it and what would be th

hi I''m doing research in tool life of solid carbide endmills and I was looking at your formulas. I was wondering if tell me or where I can find the data required for these formu

Explain the process of manufacturing ordinary Portland cement by vertical shaft rotary kiln method and write chemistry of hardening and setting of it with chemical equations.  D

BURNERS :  ATOMISER BURNERS This type of burner presents the fuel in a finely atomised spray by forcing the fuel to pass through a small orifice. The size of the orifi

why is it important to only strike the arc in the weld joint

Convert the following reduced bearings to whole circle bearings: N.36°16’E; (b) S.28° 14’ E. (c) S.47°26’W and (d) N.58°24’W

The following information was extracted from the accounting records of De Walt Company as at 28 February 2011 (the end of their financial year): Sales (50% on credit) 1 400 000 Cos

ABC Ltd. has an investment opportunity available which will involve a capital outlay in each of the next 2 years and which will produce benefits during the following 3 years. A sum

Installing Aircraft Parts: Prior to fit remove the label from the engine and attach it to the paperwork for safekeeping. Check the engine over to ensure it is complete and chec