Download Advanced Fixture Design for FMS by A.Y.C. Nee, K. Whybrew, A. Senthil kumar PDF

By A.Y.C. Nee, K. Whybrew, A. Senthil kumar

ISBN-10: 1447121198

ISBN-13: 9781447121190

Fixtures are an important to new production ideas and principally dictate the extent of flexibleness a producing method can in attaining. Advanced Fixture layout for FMS presents a scientific foundation for the choice and layout of fixturing structures. It supplies a evaluate of the present state-of-the-art of versatile and reconfigurable fixturing platforms. contemporary advancements in layout method utilizing CAD are analysed intensive. Fixture layout is obvious as an inseparable a part of procedure making plans. the first aim of a fixture approach is to make sure that the half being synthetic should be made constantly in the tolerance laid out in the layout. a brand new approach to tolerance research is used to ascertain the suitability of place surfaces and the series of operations and is defined in detail.

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This is influenced by: • • • accuracy of workpiece blank; whether first or subsequent operation; use or otherwise of in-process gauging for datum adjustment. 24 Advanced F'JXture Design for FMS • used. type of support The decision must be made whether fixed or adjustable supports are This is influenced by: • • • • • • • tolerance on design dimensions; accuracy of workpiece blank; strength and stiffness of workpiece; automatic or manual fIXture loading; clamping forces; machining forces. type of clamp The type of clamp, whether it is to be manually or automatically operated, self-retracting, etc must be specified.

It is usually preferable to reduce the number of holding forces by combining those that are in the same direction. 19. It is possible to combine all 38 Advanced Fixture Design for FMS three forces into a single force. To satisfy axiom 16 the line of action of the single force must not produce moments about any possible centre of rotation that tend to move the workpiece away from locators. 20. The component of the line of action of this force projected onto the base plane must also pass through the line joining possible centres of rotation.

This approach to design is limited by the knowledge of the individual designer. Group technology provides a structured method of giving a designer access to design knowledge generated previously by other designers. The techniques of group technology have been described in detail in numerous texts [6]. 42 Advanced Fixture Design for FMS A typical use of group technology is to group workpieces into families on the basis of similarity of shape and production technology. Classification systems are used to describe the features that are used to characterise the workpiece.

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