DESIGN AND FABRICATION OF TURNING FIXTURE FOR ELBOW

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DESIGN AND FABRICATION OF TURNING FIXTURE FOR
ELBOW

• Guided by,
• Ms.J.Jayanthi, B.E., Lecturer

• Presented by,
• G.Anandha Kumar
• G.Muthu thiyagarajan
• C.Padmanabha
• B.Prakash

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ABSTRACT

• Pipe Elbows are widely used in industries to
  change the flow direction.
• So that in industrial power piping the elbows
  place a dominant roll.
• The edge preparation of elbows generally carried
  out by boring machine.
• It is a time consuming process so we are design
  a fixture by which we can do the edge preparation
  in lathe it self.

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DESIGN OF TURNING FIXTURE

• FOR THREE INCH ELBOW
  
  
  
• LEG PLATE DIMENSION
• Center to edge dimension A (D/2)
• We know that,
• Out side dia at the bevel of elbow (D) 88.9mm
• Centre to face distance (A) 114.3mm
• Therefore,
• Center to edge dimension 114.3 (88.9/2)
• 
  157.98mm
• Allow machining tolerance for facing,
• Center to edge dimension 155.98mm

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Contd.,

• RADIUS CALCULATION FOR BLOCK AND CLAMP
• radius of curvature D/2
• 
  88.9/2
• 
  44.5mm
• Allow 1.5 mm clearance,
• Radius for block and clamp 46mm

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PARTS IN THE TURNING FIXTURE
SERIAL.NO DESCRIPTION QUANTITY
01 Base plate 01
02 Leg 02
03 Weldment 01
04 Side plate 02
05 Block 02
06 Top clamp 01
07 Stud 02
08 Bottom plate 02
09 Fit bolt 02
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VARIUS PARTS AND FUNCTIONS

• CHUCK BASE PLATE
• The figure shows the chuck base
  plate which is having mounting arrangements with
  Center Lathe. The dia of 78mm hub is fixed with
  the chuck.

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LEG

• The leg, which is getting screwed with the
  chuck base plate and holds the job-holding device
  at its diameter location.

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SIDE PLATE

• The side plate, which is having
  controlled dimensions, derived from the face to
  centre distance.

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PLATE

• It is the drilled plate, which is having
  mounting arrangements for the indexing of elbow.

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BLOCK The block is used to
hold the elbow. It is
welded with the side plate.

• 
  

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STUD

• This is being welded with side plate. This studs
  aids to clamp the job with the fixture.

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FIT BOLT

• The figure shows the fit locator bolt. For 24
  mm length we have make M20 thread. This is used
  to fit the leg with the weldment. This bolt is a
  stepped section.
•  

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TOP CLAMP

• Clamp is also used to hold the elbow which
  has a calculated dia of 46mm.It is mounted over
  the elbow by means of a stud.

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ADVANTAGES

• Time consumption for a edge preparation in
  horizontal boring machine is high. This fixture
  reduces the time up to 8minutes per a single job.
• Machining will be faster and level of accuracy
  also high.
• Setting time for fixing the elbow is less
• Optimum centre of the elbow can be maintained
  throughout the operation.

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DISADVANTAGES

• The turning fixture is depends on the size of the
  elbow. So separate fixture should be designed for
  different elbows.
• This is only suitable for mass production.

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COST ESTIMATION

• Cost of the material
• Cost of fasteners
• Cost of 3 elbow
• Machining cost
• Other charges
• TOTAL COST OF THE PROJECT

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CONCLUSION

• Thus the turning fixture for three
  inch elbow is designed and fabricated. The
  turning fixture reduces time consumption in lathe
  for mass production. Using this fixture edge
  preparation operation like grooving, facing,
  turning can be performed easily.

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TURNING FIXTURE

• ASSEMBLED VIEW

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Thank you
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Queries ??