By A.Y.C. Nee, K. Whybrew, A. Senthil kumar
Fixtures are the most important to new production recommendations and mostly dictate the extent of suppleness a producing method can in achieving. Advanced Fixture layout for FMS offers a scientific foundation for the choice and layout of fixturing platforms. It offers a assessment of the present cutting-edge of versatile and reconfigurable fixturing platforms. contemporary advancements in layout technique utilizing CAD are analysed extensive. Fixture layout is obvious as an inseparable a part of procedure making plans. the first goal of a fixture process is to make sure that the half being synthetic might be made regularly in the tolerance laid out in the layout. a brand new approach to tolerance research is used to examine the suitability of situation surfaces and the series of operations and is defined in detail.
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Additional resources for Advanced Fixture Design for FMS
2 Factory Standards The fIXture is part of a much larger production system and its design will invariably be constrained by factory standards which ensure compatibility with the rest of the system. Typical constraints imposed by factory standards are: • • • • • • • • • • • use of an accepted fixturing system, eg a particular type of modular flXturing system; use of a standard baseplate; standard tee-bolt spacing; standard fIXture components; level of automation; power source; control system; maximum dimensions to fit available machines; maximum weight; health and safety standards; compatibility and connectivity with handling and transport systems.
This is influenced by: • • • • FMS route flexibility; FMS mix flexibility; FMS volume flexibility. number of workpieces per fixture In monolithic FMS with centralised flXturing, it is often necessary to have more than one component mounted on a ftxture. This is influenced by: • • • • • fIXture service time; inter-cell transport time; intra-cell handling; machining time per workpiece. ); number of machine axes; position and orientation of location surfaces with respect to the surface being processed; FIXture Design Fundamentals 21 • • • weight of the workpiece; position of workpiece centre of gravity.
For good geometric control, the workpiece must automatically come into contact with Jlliocators in an exactly repeatable way despite operator skill. Geometric control is based on location theory. Any rigid workpiece has six degrees of freedom and twelve directions of motion. Locators stop movement in one direction only, therefore for complete location exactly six locators are required. Motions in the opposite direction are prevented by holding forces. 8, the six degrees of freedom are shown in the isometric view and the six locators necessary to restrain motion in one direction of each degree of freedom are shown in the orthographic views.