Mechanical Project Milling Fixture

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description

NIE, Praveen, mechanical, engineering, project, work, fixture, milling

Transcript of Mechanical Project Milling Fixture

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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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