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Mechanical engineering
Section A, Group no. A9
26th February, 2016
Guided By: Prof. D.N Thatoi
3/5/2016 1
Ansita Mohanty
J...
Mission Statement
Use of pneumatically controlled Sheet metal
cutter in an efficient way.
Fabrication of pneumatic sheet c...
Introduction
What is a Sheet metal
 Sheet metal is simply a metal
formed into thin and flat pieces. The
thickness of shee...
How Sheet Metal is cut:
 The cutting process is done by applying Shear Force
 Due to application of shear Force,
the str...
3/5/2016 5
Pneumatically
Operated
Sheet cutter
Hand Operated
Sheet Metal
cutter
Pictures
3/5/2016 6
CUSTOMER SURVEY FORM
Customer Name: Rabindra Pradhan
Address: Ashirvad Furniture, Laxmi Sagar
Interviewer: Smruti
Date: 15/02/2016
Questions Cu...
CUSTOMER NEEDS
No. Of
Occurrences
(Out of 20)
Weightage
Efficient Cutting 16 0.8
Reduce Human effort 14 0.7
Occupy Less sp...
SELECTED NEEDS FOR REDESIGN
The following functions were selected for redesign:
 Improvisation in Cutting
 Operational S...
FUNCTIONAL DECOMPOSITION
The approaches for developing functions that were followed are
 Fast method
Objective: To relate...
SMOOTH
OPERATION
TRANSMIT
MECHANICAL
ENERGY
PRODUCE
CUTTING FORCE
PISTON CYLINDER
COMPRESS IT
PNEUMATICALLY
LUBRICATION
DA...
AIR COMPRESSOR FRL CONTROL UNIT PNEUMATIC
CYLINDER
CUTTER BLADE
ASSEMBLY
 Compressed Air
can’t be
Generated
 Compressed ...
Cut The Metal Sheet
Input Metal
Sheet
Input Air
Pressure
Hold
Reciprocate
Connecting
Rod
Permit Finer
Cut
Fix the
Metal
Un...
3/5/2016 14
Purchase
Transport in
Package
Unpackaged
Main Frame
for Support
Store
Prepare to
Cut the
Sheet
Flow of
compres...
3/5/2016 15
Open
System
Close
System
Support
Cutting
blades
Execute
Cutting
Store the split sheetRaw Metal
sheet
Pressure ...
3/5/2016 16
Cut the metal
sheet
Supply
power
Use
electricity
Supply
electricity
Generate
compressed
air
Automatic
work
Use...
Conclusion
 Thus our concept is complying to the demands of the
customer whose use the products as well as those who
are ...
References
 Ajit Kumar Singh, Harpreet Singh and Dharmendra Sharma, “Design and
Fabrication of Pneumatic Auto Sheet Metal...
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It is not full upto fabrication, upto functional decomposition only. i will upload next parts soon...

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Pneumatic Sheet cutter ppt for engg. students

  1. 1. Mechanical engineering Section A, Group no. A9 26th February, 2016 Guided By: Prof. D.N Thatoi 3/5/2016 1 Ansita Mohanty Jyoti Panda Basundhara Pradhan Shubhendu Verma Rohit Ranjan Smurtipiyush Sahoo
  2. 2. Mission Statement Use of pneumatically controlled Sheet metal cutter in an efficient way. Fabrication of pneumatic sheet cutting machine with minimization of cost as well as size. Making the machine automatic and user friendly so that it will be easier for operation. 3/5/2016 2
  3. 3. Introduction What is a Sheet metal  Sheet metal is simply a metal formed into thin and flat pieces. The thickness of sheet is called its gauge. The thickness above 6mm falls in Plate category.  There are many metals that can be made into sheet metal like Aluminum, Brass, copper, steel, tin etc. For decorative uses sheet metals of Silver, gold, platinum are also used.  Sheet metals are used in Car bodies, medical tables, roofs for buildings etc.  Use of sheet metal are now days in furniture, shelves or cupboards. 3/5/2016 3 Schematic representation
  4. 4. How Sheet Metal is cut:  The cutting process is done by applying Shear Force  Due to application of shear Force, the stress in the material will exceed the ultimate shear strength and the material will fail and separate at the cut location.  Shearing force is applied by 2 blades one above and one below the sheet.  The upper blade delivers a quick downward blow to the sheet metal that rests on the lower blade.  The upper tool penetrates on the sheet causing the shearing and material failure. 3/5/2016 4
  5. 5. 3/5/2016 5 Pneumatically Operated Sheet cutter Hand Operated Sheet Metal cutter Pictures
  6. 6. 3/5/2016 6 CUSTOMER SURVEY FORM
  7. 7. Customer Name: Rabindra Pradhan Address: Ashirvad Furniture, Laxmi Sagar Interviewer: Smruti Date: 15/02/2016 Questions Customer Statement Interpreted Need Importance Typical Uses Cutting of aluminum plates Both Industrial and general purpose should be there Very important Cutting of mild steel Cutting of thick paper in industry LIKES Handy in operation No laborious worker needed, also no use of manual work which ensures safety Very important No skilled user needed Easy to use Power consumption is less Use of pneumatic control reduces Human effort Ease of Operation Important Reduced cost compared to Hydraulics Suitable for small Industries Genuine factor for small industries Easy maintenance compared to spring operated and rack & pinion operated Effectiveness throughout the year Depends on the use DISLIKES Lesser Sheet Thickness Limitation of Sheet type i;e sheet metal is very thin Much needed Less width of sheet Not suitable for large scale production or Batch production Comparably less use for mass production industries Not needed Suggested Improvement Safety should be ensured, Operation should be easy and it should cut the sheet effortlessly Try to make the thickness more, obtain the cutting operation comfortably. Important 3/5/2016 7
  8. 8. CUSTOMER NEEDS No. Of Occurrences (Out of 20) Weightage Efficient Cutting 16 0.8 Reduce Human effort 14 0.7 Occupy Less space 15 0.75 Low Cost 13 0.65 Less Maintenance 10 0.5 Automatic Operation 11 0.55 Reduce Power Consumption 7 0.35 Safety During Machining 10 0.5 Portability 15 0.75 More thickness of Sheet 9 0.45 3/5/2016 8 Customer Need Statements and Importance Ranking
  9. 9. SELECTED NEEDS FOR REDESIGN The following functions were selected for redesign:  Improvisation in Cutting  Operational Suitability  Portability  Occupying Less space PROBLEM DEFINITION (Our Objective) A Pneumatic sheet cutter has to be designed and developed. In order to reduce human effort in manual operated machine our machine should ensure automatic operation, finer cutting. In addition to that the product should be small in size so that it is easier to carry the product from one place to another. 3/5/2016 9
  10. 10. FUNCTIONAL DECOMPOSITION The approaches for developing functions that were followed are  Fast method Objective: To relate one sub-function to another and so to increase the product value.  Subtract Operate Procedure Method Objective: To disassemble each component from the product and analyze the effect in a logical way.  Activity diagram and Function structure method Objective: To describe the overall process description of customer from buying the product to operating it. Also to describe the flow paths from start of machine to end of the action.  Functional hierarchical decomposition Objective: To trace the flow of energy, material and signals from the bottom to the top level. 3/5/2016 10
  11. 11. SMOOTH OPERATION TRANSMIT MECHANICAL ENERGY PRODUCE CUTTING FORCE PISTON CYLINDER COMPRESS IT PNEUMATICALLY LUBRICATION DAMP VIBRATIONS TRANSMIT FORCE TO CUTTING BLADE ALIGNMENT OF WORK PIECE LOCOMOTION OF CUTTING BLADE OVER SHEET METAL CUT THE SHEET PROVIDE AIR GENERATE NOISE HOW? WHY? REDUCE NOISE ELIMINATE LEAKAGE 3/5/2016 11 PORTABILITY LINEAR SMOOTH OPERATION FAST Method
  12. 12. AIR COMPRESSOR FRL CONTROL UNIT PNEUMATIC CYLINDER CUTTER BLADE ASSEMBLY  Compressed Air can’t be Generated  Compressed air flow can’t be regulated  Pressurized air can’t be expanded  No up-down motion of blade for cutting  Main source of energy i;e Compressed air Pressure can’t be given to Cylinder  The FRL (Filtration- Regulation- Lubrication) process can’t be performed  As expansion wont take place, piston movement can’t occur  Moving blade can’t be pushed down  Energy can’t be stored in the Cylinder to perform mechanical work  Connecting rod can’t Reciprocate  Shearing operation can’t take place  The Rod can’t push the Upper blade  Also no support arms to hold and secure the sheet SUBTRACT AND OPERATE APPLIED TO THE PNEUMATIC SHEET CUTTER
  13. 13. Cut The Metal Sheet Input Metal Sheet Input Air Pressure Hold Reciprocate Connecting Rod Permit Finer Cut Fix the Metal Under Cutter Provide Indication for Cutting Accept it through FRL Control Unit Transmit Pressure to Connecting Rod Support the Pneumatic Cylinder Convert Compressed Air Pressure to Mechanical work Reciprocation of Cylinder Rod Movement of the Blade Fix The Pneumatic Cylinder On the Machine SOP Diagram
  14. 14. 3/5/2016 14 Purchase Transport in Package Unpackaged Main Frame for Support Store Prepare to Cut the Sheet Flow of compressed air to the Cylinder Motion of connecting rod Cutting of Sheet metal Throw away Debris Process descriptions as Activity Diagrams for Sheet cutter product
  15. 15. 3/5/2016 15 Open System Close System Support Cutting blades Execute Cutting Store the split sheetRaw Metal sheet Pressure force Air Sheet uncut Cutting force Release air Sheared metal sheet Provide elect. to compressor Generation of compressed air Stores compressed air Flow of air to FRL unit Compression & storage Release into pneumatic cylinder Cut the sheet FRL Unit Expansion of air inside cylinder Motion of connecting rod to movement of blade Shearing over the sheet Electrical energy Compress ed air pressure Air Uncut Sheet Sheared metal K.E of blade Cutting of metal as required Desired cut
  16. 16. 3/5/2016 16 Cut the metal sheet Supply power Use electricity Supply electricity Generate compressed air Automatic work Use different sheets Accept sheets Hold sheets Movement of upper blade Feel easier operation Use regulating switch Convert elet. To compressed air Apply K.E to blade Reciprocate connecting rod Convert air Pr. to K.E Expansion of compressed air in cylinder Regulate air flow Withstand air flow Motion of connecting rod Use FRL control unit Use tubes to allow air flow Provide compressed air Hierarchical Decomposition
  17. 17. Conclusion  Thus our concept is complying to the demands of the customer whose use the products as well as those who are new.  The latent needs of customers, which they were not able to reciprocate properly is estimated successfully.  The individual functions were studied thoroughly and were evaluated by each group member.  Further study will involve more analysis about the product and comparison of similar products available in the market. 3/5/2016 17
  18. 18. References  Ajit Kumar Singh, Harpreet Singh and Dharmendra Sharma, “Design and Fabrication of Pneumatic Auto Sheet Metal Cutting Machine Using Solar Energy”, International Journal of Engineering Research & Technology (IJERT): ISSN: 2278-0181: Vol. 4 Issue 03, March-2015  A.S. Aditya Polapragada & K. Sri Varsha , “Pneumatic Auto Feed Punching, cutting and Riveting Machine “, International Journal of Engineering Research & Technology (IJERT) Vol. 1 Issue 7, September - 2012 ISSN: 2278-0181.  P.M.Pradhan, “Experimental Investigation and Fabrication of Pneumatic Cutting tool”, International Journal of Innovative Research in Science, Engineering and Technology, Vol. 2, Issue 6, June 2013. 3/5/2016 18
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It is not full upto fabrication, upto functional decomposition only. i will upload next parts soon...

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