冷間後方カップ押出し鍛造におけるねじり振動付加による押出し部の表面性状および形状の変化:―ねじりモーション付加鍛造加工法の開発 第2報―  [in Japanese] Changes in Surface Quality and Shape of Extruded Part by Torsional Oscillation in Cold Backward Cup Extrusion:―Development of Forging Process with Torsion Motion II―  [in Japanese]

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Abstract

<p>The surface quality and shape of an extruded part of a workpiece were investigated in cold backward cup extrusion with torsional oscillation. In this extrusion process, a cylindrical aluminum workpiece lubricated with a mineral oil was simultaneously extruded in the axial direction and twisted in the circumferential direction between extrusion and knockout punches with a maximum axial speed of 0.1 mm/s, an alternating amplitude of 5°, and a maximum angular speed of 0.5 rpm at room temperature. The deformation behavior of the workpiece at the inner surface of the container was investigated by experiment and finite element simulation. The sidewall of the workpiece was axially extruded and circumferentially rotated with approximately 25% lower contacting pressure with the container, so that an extruded workpiece with a uniform and smooth sidewall surface was obtained. Furthermore, the circumferential profile of the sidewall height of the extruded workpiece was close to uniform because the workpiece was uniformly lubricated by the circumferential rotation of the workpiece. The influence of the non-uniform friction at the container-workpiece contact on the sidewall height of the extruded workpiece was discussed using the results of finite element simulation.</p>

Journal

  • Journal of the Japan Society for Technology of Plasticity

    Journal of the Japan Society for Technology of Plasticity 60(703), 241-246, 2019

    The Japan Society for Technology of Plasticity

Codes

  • NII Article ID (NAID)
    130007694926
  • NII NACSIS-CAT ID (NCID)
    AN00135062
  • Text Lang
    JPN
  • ISSN
    0038-1586
  • NDL Article ID
    029958777
  • NDL Call No.
    Z17-218
  • Data Source
    NDL  J-STAGE 
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