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DEPARTMENT OF TECHNICAL EDUCATIONANDHRA PRADESH

Name : K. Madhu KumarDesignation : Sr. lecturerBranch : Mechanical Engg.Institute : GIPDCET , VisakhapatnamYear/Semester : I YearSubject : Workshop TechnologySubject Code : M-105Topic : Basic Workshop Tools and

operations Duration : 50 minsSub Topic : Manufacturing process

(Introduction)Teaching Aids : Ppt

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Objectives

• On completion of this period you would be able to

• State various manufacturing processes

• State importance of manufacturing processes

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• Have you seen manufacturing of gates, grills etc. ?

• What type of manufacturing process is it ?

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• It is a fabrication process involving welding as joining

method.

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• In a similar way all the articles we use in daily life are

produced by different manufacturing processes.

• In this lesson we will introduce ourselves to some basic

manufacturing processes

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•It is an activity of making goods and articles by hand or machine

•It is a transformation of raw materials or semi finished products

into finished products

•It can be done either.

•by hand or

•by machine.

What is a manufacturing process ?

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Block diagram of production

Primary Manufacturing process

Semi finishedproducts

Rawmaterials

SecondaryMfg process

Finished productsWith shape, size & finish

Fig 1 Block diagram of production

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Types of manufacturing process

• Shaping processes

• Metal forming & metal working processes

• Machining processes

• Joining processes

• Surface finish processes

• Processes affecting change in properties

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Shaping process

• This is called casting process.

• Casting is shaping of material in molten state poured in

cavity(mould)

• After solidification it is removed from mould,cleaned and

machined

• Shape and size of the product is the shape of the mould

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Castings

Fig 2. Casting process

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Metal forming & metal working process

•Here metal is shaped by plastic deformation.

•Heat may or may not be applied.

•Pressure is applied by external means.

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Classification of Metal Forming

Metal Forming

Hot Working Cold Working

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Comparison Between Hot Working and Cold Working

• Hot Working• Metal shaped above

Recrystallisation Temperature.

• Examples:

• Forging

• Hot rolling

• Hot extrusion

• Cold Working• Metal shaped below

Recrystallisation Temperature

• Examples:

• Cold drawing

• Bending

• Squeezing

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Forging

Fig 3. Forging process

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Cold bending

Fig 4 cold Bending

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Joining process

This process is used for joining of metal parts together in fabricating works

•The common joining processes are

•Welding

•Soldering

•Screwing

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Common joining processes (contd)

• Riveting

• Adhesive joining

• Brazing

• Pressing

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Welding

Fig 5 Welding process

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Surface finishing process

•In this process a very negligible amount of metal is removed or added to provide good surface finish of metal surface

The common processes are

Buffing Lapping Electroplating

Polishing Super finishing Metal spraying

Honing Belt grinding Anodizing etc

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Process effecting change in properties

These processes are to impart certain specific properties to metal parts for particular operation like,

• Hardening,

• softening

• Grain refinement,

•Change in internal structure

•Resistance to fatigue

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A few prominent processes are,

•Heat treatment

•Cold working

•Hot working

•Shot peening

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Importance of manufacturing process

• Economic use of resources i.e men materials machines &

energy

• Economic development

• Competing on global basis

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Basic work shop process

• Carpentry

• Fitting

• Forging

• Sheet metal

• Cold working

• Hot working

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Summary

In this period we have learnt about:

• Methods of manufacturing processes

• Importance of manufacturing processes

• Introduction to basic Workshop processes

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Quiz

1 In hot working process the metal is shaped at a temperature

a . Above recrystalization

b . Below recrystalization

c . At recrystalization

d . None of the above

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Questions

1. What is the importance of Manufacturing process?

2. List out various Manufacturing process?

3. Explain about Joining Process?