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

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

Fixtures are the most important to new production concepts and mostly dictate the extent of flexibleness a producing approach can in achieving. Advanced Fixture layout for FMS presents a scientific foundation for the choice and layout of fixturing platforms. It supplies a overview of the present state-of-the-art of versatile and reconfigurable fixturing platforms. fresh advancements in layout technique utilizing CAD are analysed intensive. Fixture layout is noticeable as an inseparable a part of strategy making plans. the first aim of a fixture procedure is to make sure that the half being synthetic could be made always in the tolerance laid out in the layout. a brand new approach to tolerance research is used to envision the suitability of place surfaces and the series of operations and is defined in detail.

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0:;' ~ ~~ ~ ~. ~~ ;e :::-. ~ t; ~'< - ... ~~ i;!. I::) ~;e ~~ • Cl ..... :::. 'j ~. -- . J , e ~ ~ 0 6 8~ c:: ~ ~ 0 rae 0 ~ ~ a e; 46 Advanced Fixture Design for FMS imposed on the designer. During each phase tentative designs are developed which include aspects of all the design outcomes. It should be noted that although the design outcomes are developed concurrently, the design inputs are serial iUld the design iterations within each phase of the design only consider a limited set of criteria.

It should be noted that final dimensions must be calculated from working dimensions and not other final and balance dimensions. 25 The tolerance calculated in this manner is incorrect as the tolerance on the position of surface Al is wrongly included and this surface has no effect on dimension BC. 2 are as a result of very simple process sequences. In practice the sequence may be much more complex requiring multiple set-ups on several different machines. Higher order tolerance stacks are by no means unusual and they can be quite difficult to detect.

Cutting force prediction has been intensively researched since Taylor's work in 1907 [7]. We owe much of our modern understanding of metal cutting to Merchant and Ernst [8]. More recent work by Oxley and his co-workers has provided a theoretical model that can predict cutting forces in single-point orthogonal cutting with reasonable confidence [9]. Although this model has been extended to include the more complicated cutting geometries found in drilling and milling, the extended models are generally too complex for practical routine design.

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