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

Assignment Help:

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 


Related Discussions:- Advantages and disadvantages of hot working and cold working

Poultry numericals, design cage type poultry house for 1000 lying birds als...

design cage type poultry house for 1000 lying birds also specify the equipments for feeding,watering,lighting and protecting birds.

Hysteresis, hysteresis loss least epends on

hysteresis loss least epends on

Rayleigh scattering, how rayleigh scattering occurs in optical fiber cable

how rayleigh scattering occurs in optical fiber cable

Aviation legislation - dealer’s certificate , DEALER'S CERTIFICATE Refere...

DEALER'S CERTIFICATE Reference: When the sale of an aircraft involves flight without a Certificate of Registration, The C.A.A. will permit the aircraft to fly under certain re

Function ismember - set operations, function ismember - set operations: ...

function ismember - set operations: The function ismember receives two vectors as input arguments, and returns a logical vector which is of similar length as the first argumen

Clamping circuit, draw and explain the working of a positive clamping circu...

draw and explain the working of a positive clamping circuit?

Aeroengines - compressible flow, All fluids are to some extent compressible...

All fluids are to some extent compressible but gases show significant changes in density if pressure and/or temperature is changed. Some gas flows can be treated as being incomp

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd