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    In Process Control of Strain in a Stretch Forming Process

    Source: Journal of Engineering Materials and Technology:;2001:;volume( 123 ):;issue: 004::page 496
    Author:
    D. E. Hardt
    ,
    W. A. Norfleet
    ,
    V. M. Valentin
    ,
    A. Parris
    DOI: 10.1115/1.1397780
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The process of stretch forming is used extensively in the aerospace industry to form large sheet panels of mild curvature. This has traditionally been a low precision process requiring considerable hand-working at assembly. However, recent demands for faster, less wasteful production have placed new demands on the accuracy and consistency (quality) of this process. In this paper the various modes of control for this process are examined, from both an analytical and experimental point of view. It is shown clearly that the process is least sensitive to material and machine property variations if controlled to a target level of strain in specific areas of the sheet. This method is compared with the conventional methods of controlling either the force applied to the sheet during stretching or the displacement of the stretch jaws. A series of both lab scale and full production experiments concur with the analytical findings, demonstrating reduced process variation if strain feedback is used. Lab experiments and analysis indicate that far greater reductions are possible if a more precise form of strain control is used. In production trials forming wing leading edges, a manually implemented strain control showed a shape variation reduction of 50 percent over normal factory practice using force control.
    keyword(s): Stress , Displacement , Displacement control , Force , Machinery , Force control , Thickness , Shapes , Process control , Work hardening AND Feedback ,
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      In Process Control of Strain in a Stretch Forming Process

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    contributor authorD. E. Hardt
    contributor authorW. A. Norfleet
    contributor authorV. M. Valentin
    contributor authorA. Parris
    date accessioned2017-05-09T00:05:01Z
    date available2017-05-09T00:05:01Z
    date copyrightOctober, 2001
    date issued2001
    identifier issn0094-4289
    identifier otherJEMTA8-27024#496_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/125287
    description abstractThe process of stretch forming is used extensively in the aerospace industry to form large sheet panels of mild curvature. This has traditionally been a low precision process requiring considerable hand-working at assembly. However, recent demands for faster, less wasteful production have placed new demands on the accuracy and consistency (quality) of this process. In this paper the various modes of control for this process are examined, from both an analytical and experimental point of view. It is shown clearly that the process is least sensitive to material and machine property variations if controlled to a target level of strain in specific areas of the sheet. This method is compared with the conventional methods of controlling either the force applied to the sheet during stretching or the displacement of the stretch jaws. A series of both lab scale and full production experiments concur with the analytical findings, demonstrating reduced process variation if strain feedback is used. Lab experiments and analysis indicate that far greater reductions are possible if a more precise form of strain control is used. In production trials forming wing leading edges, a manually implemented strain control showed a shape variation reduction of 50 percent over normal factory practice using force control.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleIn Process Control of Strain in a Stretch Forming Process
    typeJournal Paper
    journal volume123
    journal issue4
    journal titleJournal of Engineering Materials and Technology
    identifier doi10.1115/1.1397780
    journal fristpage496
    journal lastpage503
    identifier eissn1528-8889
    keywordsStress
    keywordsDisplacement
    keywordsDisplacement control
    keywordsForce
    keywordsMachinery
    keywordsForce control
    keywordsThickness
    keywordsShapes
    keywordsProcess control
    keywordsWork hardening AND Feedback
    treeJournal of Engineering Materials and Technology:;2001:;volume( 123 ):;issue: 004
    contenttypeFulltext
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