Machine Frames, Bolted Connections, and Welded

Machine Frames, Bolted Connections, and Welded - Machine...

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1 Machine Frames, Bolted Connections, and Welded Joints Chapter 20 Material taken from Mott, 2003, Machine Elements in Mechanical Design Machine Frames, Bolted Connections, and Welded Joints ± We have looked at individual machine elements while considering how these elements must work together in a more comprehensive machine. ± As the design progresses, there comes a time when you must put it all together. Machine Frames, Bolted Connections, and Welded Joints ± At this point you must decide, “What do I put it in? How do I hold all of the functional components safely, allowing assembly and service while providing a secure, rigid structure?”
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2 Machine Frames and Structures ± The design of machine frames and structures is largely art. Where the designer envisions how the components of the machine will be accommodated. ± The designer is often restricted in where supports can be placed in order not to interfere with the operation of the machine or in order to provide access for assembly or service. Machine Frames and Structures ± Some of the more important design parameters include: ± Strength ± Appearance ± Corrosion resistance ± Size ± Vibration limitation ± Stiffness ± Cost to manufacture ± Weight ± Noise reduction ± Life Machine Frames and Structures ± Structural design techniques for machine frames can be seen as designing a building, where techniques used in other application apply. Such as; simple beam, truss analysis, indeterminate beams, deflection theory, rigid frames, finite element analysis techniques and, so on. ± The designer must choose the appropriate design analysis technique for the application in consideration.
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Machine Frames and Structures ± Because of the virtually infinite possibilities for design details for frames and structures, this section will concentrate on general guidelines. ± Factors to consider in starting a design project for a frame are: ± Forces exerted by the components of the machine through mounting points such as bearings, pivots, brackets, and feet of other machine elements. Machine Frames and Structures ± Manner of support of the frame itself ± Precision of the system: allowable deflection of components ± Environment in which the unit will operate ± Quantity of production and facilities available ± Availability of analytical tools such as computerized stress analysis, past experience with similar products, and experimental stress analysis ± Relationship to other machines, walls, etc ± Many of these factors require judgment by the designer. Materials ± As with machine elements discussed throughout this book, the material properties of strength and stiffness are of prime importance. ± In general, steel ranks high in strength compared with competing materials for frames. ± But it is often better to consider more
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Machine Frames, Bolted Connections, and Welded - Machine...

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