mechanical project milling fixture
DESCRIPTION
NIE, Praveen, mechanical, engineering, project, work, fixture, millingTRANSCRIPT
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"For an optimist the glass is half full, for a pessimist it's half empty,
and for an engineer is twice bigger than necessary."
At: PAMS Engineering, Mysore
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Conceptualize a basic fixture configuration through
analyzing all the information.
Outputs:-
Fixture type and complexity
Number of workpieces per fixture
Orientation of workpieces within fixture
Clamping surfaces
Locating surfaces
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Generation of fixture layout is to represent the fixtureconcepts in a physical form.
outputs:-
Position of locators
Position of clamps
Position of supports, if any
Types of clamps
Type of locators
Type of supports
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• Fixture element design is to create the solid models ina CAD system of the practical embodiment of theconceptual locators, clamps and supports.
Outputs: -
Detailed design of locators
Detailed design of Clamps
Detailed design of supports
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Tool body design is to produce a rigid structure
carrying all the individual fixture elements in their
proper places.
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Design specifications
Factory standards
Ease of use and safety
Economy
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Information gathering and analysis.
Consideration of clamping & locating schemes.
Design of fixture body.
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Principle purpose of a machining fixture is to locate the
workpiece surfaces for performing a machining
operation
Surfaces to be distinguished
Active surfaces
Supporting & locating surfaces
Clamping surfaces
Free surfaces
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Clamp
Device for providing an invariant location with respect to anexternal loading system.
Requirements of locking elements
To provide a suitable locking for achieving the
stability of location.
To provide sufficient frictional effects without
causing undesirable effect
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Easy to manipulate manually or otherwise
Quick acting so as to reduce time setting clamping
and simultaneous locating
Inexpensive
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Orientation of locators
Clamping force should be directed towards supporting and locating elements on overhanging or thin sections of the workpiece
classification of Clamping Elements
Type 1: elements in which the elastic deformationincreases with clamping force Ex: screws, levers, camsetc..,
Type 2: elements in which the clamping force assumesa constant value independent of the elastic deformationat the contact surface. Ex: Fixtures operated withhydraulic and pneumatic pressure
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To provide a suitable locking for achieving the
stability of location.
To provide sufficient frictional effects without
causing undesirable effect
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