Title page for etd-0827112-024842


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URN etd-0827112-024842
Author Chia-Yu Chang
Author's Email Address No Public.
Statistics This thesis had been viewed 5581 times. Download 3272 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Study of Drawing and Heading Processes of Magnesium Alloy Screws
Date of Defense 2012-07-20
Page Count 118
Keyword
  • finite element analysis
  • thread-rolling
  • heading
  • drawing
  • extrusion
  • LZ91 magnesium alloy
  • Abstract Screws are produced by four manufacturing processes : extrusion, drawing,
    heading and thread-rolling. This paper will develop the related manufacturing
    technology of LZ91 magnesium alloy screws. At first, finite element simulation is
    adopted to analyze the effects of each process parameters on the formability. Then, each
    process experiments are conduted to manufacture an M6 magnesium alloy screw.
    Comparisous between analytical and experimental results verify the suitability and
    accuracy of the analytical models.
    In the extrusion process, by the finite element simulations the extrusion load is
    obtained. Then bar extrudsion experiments with high extrusion ratioto manufacture two
    bars of 6.5 and 7 mm in diameter using a 350 ton extrusion machine .
    In the drawing process, the effects of reduction and friction factor on the optimal
    semi-die angle are discussed, and the relationship is found. Then a rod of 7.0 mm in
    diameter is drawn into 6.5 mm experimentally.
    In the heading process, three stages in it`s process are designed. The arc shape and
    axial length of the die for the first stage are found out. Finally, heading experiments are
    conducted and sizes between the product and the simulation results are compared.
    In thread-rolling process, the effects of the screw plate gap on the formability are
    discussed numerically. Then, thread-rolling experiments are conducted to compare the
    sizes of the product and the simulation results.
    In addition, microstructure observation and hardness test are conducted to
    understand the effects of drawing process on the strength of the product.
    Advisory Committee
  • Woei-Shyan Lee - chair
  • Wei-ching Ye - co-chair
  • Fu-guo Chen - co-chair
  • You-min Hwang - co-chair
  • Yeong-Maw Hwang - advisor
  • Files
  • etd-0827112-024842.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2012-08-27

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