fixture layout
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Machining Fixture Layout
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1.0 Int rodu ct ion
Higher efficiency and lower production costs in terms of product
quality and productivity - development of automated manufacturing
systems.
Fixture - locate and constrain the workpiece during machining,
inspection and assembly.
Design and manufacturing of fixtures become costlier because of
tight tolerance and restrictions in the machining operations.
Design and fabrication of fixtures incur 10-20 % of the total cost
spent in the manufacturing system.
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Fixtures-To locate and constrain a workpiece during machining
operation, includes locators and clamps. In machining fixture layout, externally applied clamping force and
reactions exhibited in locator causes moment which in turn produces
deformation on machined workpiece. The moment is influenced not only
by the magnitude of clamping forces and reactions but also by the
positions of fixture elements.
Clamping and cutting forces can not be minimized beyond a extent.
Hence, the interrelationship between the position of fixture elements andworkpiece deformation is critical to ensure the accuracy of the
machining process.
1.0 Introduction (Contd.,)
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1.0 Introduction (Contd.,)
Conventionally, an appropriate position for fixture elements is determined
by relying on design experience or trial and error methods which are
proved to be expensive and time consuming.
No assurance of optimal or near optimal solutions. Further, these
practices are not flexible.
Numerical models like FEMs were used to replace the analytical models.
Many researchers have been used FEM for modeling and analysis fixture
workpiece interactions. Commercial finite element solver has also been
employed for FEM calculations. ANSYS software was used to calculate
the displacement of the workpiece at the time of machining.
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Author Year Objective Design criteria Tools used
Menassa
andDeVries
1991 To determine the
position of supports
The minimization of the
workpiece deflection atselected points as the
design criterion
FEA
Meyer
and Liou
1997 To synthesize fixtures
for dynamic machining
conditions
For the minimum
clamping forces and
locator forces is given
Linear
programming
technique
Li andMelkote
1999 To optimize layoutproblem
Minimizes workpiecelocation errors due to
localized elastic
deformation of the
workpiece.
Nonlinearprogramming
method
Roy and
Liao
1999 To plan for the best
supporting andclamping positions
--- Heuristic
method
Tao et al. 1999 Determining the optimal
clamping points and
clamping sequence
For arbitrarily shaped
workpieces
A geometrical
reasoning
methodology
1.0 Intro duct ion (Contd.,)
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Author Year Objective Design criteria Tools used
Liao andHu 2000 Fixtureworkpiecesystem subject to time-
varying machining loads
fixture configurationanalysis based on a
dynamic model
Influence of clampingplacement is also
investigated
Li and
Melkote
2001 Combined fixture layout
and clamping force
optimization
--- Contact elasticity
modeling method
Amaral etal.
2004 Optimization analysis --- ANSYS
Tan et al. 2004 Modeling, analysis and
verification of optimal
fixturing configurations
--- By the methods of
force closure,
optimization and finite
element modeling
Kumar et
al.
1999 Designing a fixture --- Both GA and neural
networks
Marcelin 2001 Optimization of support
positions
--- GA
1.0 Intro duct ion (Contd.,)
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Author Year Objective Design criteria Tools used
Vallapuzhaet al.
2002 Fixture layoutoptimization
--- GA based optimizationmethod
Krishnakum
ar and
Melkote
2000 Fixture layout
optimization
Minimizes the
deformation of the
machined surface due
to clamping andmachining forces over
the entire tool path
GA
Necmettin
Kaya
2005 To find the
optimal locator
and clamp
positions in 2D
workpiece
Chip removal is taken
into account while tool
forces moving on the
workpiece
GA tool
1.0 Intro duct ion (Contd.,)
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Author Year Objective Design criteria Tools used
Vallapuzha
et al.
2002 Fixture layout
optimization
--- GA based optimization
method
Krishnakum
ar and
Melkote
2000 Fixture layout
optimization
Minimizes the
deformation of the
machined surface due
to clamping and
machining forces over
the entire tool path
GA
Necmettin
Kaya
2005 To find the
optimal locator
and clamp
positions in 2D
workpiece
Chip removal is taken
into account while tool
forces moving on the
workpiece
GA tool
1.0 Intro duct ion (Contd.,)
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REFERENCES
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http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2340087%232000%23999509998%23661953%23FLP%23&_cdi=40087&_pubType=J&view=c&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=fdd5fe737afccb0eb081c08616d338cfhttp://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506http://www.sciencedirect.com/science/journal/00078506 -
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6. Rdrigo A. Marin and Placid M. Ferreira, Analysisof the influence of
fixture locator errors on the compliance of work part features togeometric tolerance specifications, J. Manuf. Sci. Eng., Vol.
125,No.3, 609 (8 pages),2003.
7. Necmettin Kaya, Machining fixture locating and clamping position
optimization using genetic algorithms, Computers in Industry, Vol. 57,
No.2, Pp.112-120, 2005.8. ANSYS 8.0, ANSYS Inc., 2003.
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fixture layout under multi-constraints, International Journal of Machine
Tools & Manufacture, Vol. 46, Pp.12911300, 2006.
10. Xiaoyun Liao and G. Gary Wang, Simultaneous optimization of
fixture and joint positions for non-rigid sheet metal assembly, The
International Journal of Advanced Manufacturing Technology, Vol. 36(3-
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REFERENCES
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investigation of fixture workpiece contact behaviour for the dynamic simulation of
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Any Queries
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REFERENCES
Thankyou
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