Burr Formation

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A SEMINAR REPORT ON

AN OVERVIEW ON BURR FORMATION, ITS MINIMIZATION

AND DEBURRING PROCESS

NAME: ARKA DEY

ROLL NO. 081020070243RD YEAR

UNDER THE GUIDANCE OF

DR. SANTANU DAS

PROFESSOR AND HEAD

DEPARTMENT OF MECHANICAL ENGINEERING

KALYANI GOVERNMENT ENGINEERING COLLEGE

NADIA- 741 235

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INTRODUCTION TO BURR

� An undesirable projection of material formed as the

result of plastic flow from a cutting or shearing operation

[Dornfeld].

� A work piece edge with overhang [DIN].

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PROBLEMS WITH BURR

Decrease in the fit and ease of assembly of parts.

Damage dimensional accuracy and surface finish.

Increase in the cost and time of production due to

deburring.

Chance of injury to workers and consumers.

Poor machineability.

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CLASSIFICATION OF BURR

Burr can be classified in various ways.

According to GILLESPIE [1998] Burr can be classified as Poisson Burr, Tear 

Burr and Rollover Burr and Cut-off Burr.

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According to the cutting process applied Burr can be Turning, Drilling, Grinding

and Milling Burr.

CHERN [1993] classified Milling Burr as (1) the knife-type burr; (2) the wave-type

burr; (3) the curl-type burr; (4) the edge breakout; and (5) the secondary burr.

HASIMURA AND DORNFELD [1999] Classified Burr according to its location.

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KIM AND DORNFELD [2001] categorized Drilling Burr as Uniform Burr Type I,

Uniform Burr Type II, Uniform Burr Type with Drill Cap, Crown Burr, Transient Burr.

Development of Drilling Burr occurs in five stages.

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BURR MINIMISATION STRATEGIES

To minimize Burr formation measurement of Burr is necessary. Fingernail test is

one of the most used Burr measuring method.

A well maintained process chain can help in reduction of Burr formation.

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PROCESSES REQUIRED FOR REDUCTION OF BURR FORMATION

Tool and tooling : tool geometry alteration, proper tool material selection

corresponding to the work material, coating technology, tool size.

C oolant : application method, coolant media, application location.

W ork material 

:replace work material for less burr or preferable burr type.

W ork geometry : design change (e.g. chamfer).

P rocess parameters: proper combination of cutting speed, feed, etc.

P rocess sequencing 

:

order of processes.

Tool path planning.

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DEBURRING PROCESSES

Deburring can be done through various ways such as:

Mechanical deburring operations,

Thermal deburring operations,

Chemical deburring operations,

Electrical deburring operations.

Mechanical Deburring could be Cutting based, Mass finishing and other ways

such as Abrasive jet, Cryogenic Abrasive jet, Water jet etc.

Cutting Based: 

Sanding, Mechanical Cutting,

Vibratory Conveyor,

Manual Deburring,

Power Brushing.

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Mass Finishing:

Barrel Tumbling,

Cryogenic Barrel Tumbling,

Vibratory Debuuring,

Cryogenic Vibratory Finishing, Roll Flow Finishing.

Thermal Deburring, Chemical Deburring and Electrical Deburring are also used

in industries for deburring.

Thermal Deburring

:

Thermal Energy Method,

Hot Wire,

Resistance Heating,

Laser Deburring,

Electronic Discharge Machining (EDM).

Chemical Deburring

Chemical Barrel Finishing,

Chemical Vibratory Finishing,

Chemical Roll Flow Finishing,

Chemical Spindle Finishing,

Chemical Centrifugal Finishing.

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Electrical Deburring:

Electrochemical Barrel Tumbling,

Electrochemical Vibratory Finishing,

Electrochemical Roll Flow Finishing,

Electrochemical Spindle Finishing,

Electrochemical Reciprocal Finishing.

1-Cathode 2

-work piece 3± burr 4± duct of electrolyte5- Power supply 6- electrolytic circulation and filtration system

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CONCLUSION

As Deburring is a non value added process it is better to minimize Burr than to

Deburr it.

It was found that Burrs are formed due to various factors including geometry of 

the job, tool exit angle, environmental condition, speed, feed, depth of cut, tool

path planning etc so during machining the above mentioned conditions should bekept in mind.

But it should be kept in mind that for better finishing and job handling if 

Deburring is needed it should be done.

Now many types of highly effective Deburring processes are available by which

burrs can be removed very easily.

So, above all our aim should be to overcome the difficulties arising due to burr 

formation and to minimize the burr formation and to use deburring when needed.

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THANK YOU