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Evaluation of Formability and Drawability of Al 5182-O Using a Servo Drive Press

Mao, Tingting
http://rave.ohiolink.edu/etdc/view?acc_num=osu1408639500

Abstract Details

2014, Doctor of Philosophy, Ohio State University, Industrial and Systems Engineering.
The part drawability in stamping process can be improved by many factors, including blank geometry, lubricant, surface finish, the deformation speed and the blank holder force. Lowering the friction between the tool and the workpiece can reduce fracture potential in the part. Friction is affected by contact pressure, temperature, sliding velocity, die material/coating and surface texturing. In this study, only the effects of lubrication and surface were investigated. Various lubricants such as dry film lubricant and wet lubricants, which were developed for aluminum alloys, were evaluated using cup draw test. Tribological test such as cup draw test was utilized to evaluate the lubricity of the selected lubricants. It was found out that dry film lubricant performed better than wet lubricants in the deep drawing of aluminum alloys. Mill finish and Electrical Discharge Texturing (EDT) that are surface topographies for aluminum alloys, were evaluated by conducting cup draw test in the study. It was concluded that EDT can provide better lubrication condition at the interface between workpiece and die, compared to Mill Finish. Blank geometry can be optimized to improve the part drawability. In this study, different blank geometries were studied by using FE simulations to optimize the blank geometry to be used in the servo press tryouts. It was found out blank with an optimal blank shape, such as four corners chamfered blank shape, could give less wrinkling. Designing a proper tooling also can improve the part drawability by selecting the optimum punch/ die radii and punch and die clearance. In this study, FE simulations were conducted to determine the optimum punch and die radii and clearance between punch and die. By using a mechanical servo press, which can 1) vary the ram speed at any slide position and 2) vary the blank holder force through the stroke can improve the part by selecting the optimal deformation speed and blank holder force. In this study, the effect of ram speed and variable blank holder profile on part drawability was investigated. It was found out that a higher speed can form a better part.
Taylan Altan (Advisor)
149 p.
Engineering
Al 5182-O, Servo press, Cup draw test, Mill Finish, Electrical Discharge Texturing, Dry film lubricant, Deep draw, High speed, Low speed

Recommended Citations

Citations

  • Mao, T. (2014). Evaluation of Formability and Drawability of Al 5182-O Using a Servo Drive Press [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408639500

    APA Style (7th edition)

  • Mao, Tingting. Evaluation of Formability and Drawability of Al 5182-O Using a Servo Drive Press. 2014. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1408639500.

    MLA Style (8th edition)

  • Mao, Tingting. "Evaluation of Formability and Drawability of Al 5182-O Using a Servo Drive Press." Doctoral dissertation, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408639500

    Chicago Manual of Style (17th edition)

osu1408639500
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This open access ETD is published by The Ohio State University and OhioLINK.