Conditions for wall thickness reduction in hollow sinking of SUS304 tubes with drawing speed control in entrance and exit sides of die

Takuma Kishimoto, Shiori Gondo, Kosuke Takemoto, Kenichi Tashima, Shinsuke Suzuki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, the conditions for wall thickness reduction in hollow sinking were obtained by tube drawing experiments in which the drawing speed ratio was controlled under three conditions (1.09, 1.11, and 1.14). These conditions have not been found in the history of hollow sinking. The results of the experiment and the theoretical formulas indicate that the geometric condition is obtained from the figure of the ratio of inner diameter to outer diameter after drawing against that ratio before drawing. Furthermore, the ratio of the inner diameter to the outer diameter after drawing must be above the constant wall thickness line derived from the cross-sectional change. To satisfy this geometric condition, the drawing speed ratio must be larger than the threshold value, which is obtained from the ratio of the inner diameter to the outer diameter before drawing, and the reduction of the die. However, the value of the back stress approaches that of the strength of the tube when the drawing speed ratio increases. A simple dynamical model shows that parameters other than the drawing speed ratio do not significantly decrease the back stress during drawing. Therefore, the drawing speed ratio should be set such that the tube does not break.

Original languageEnglish
Article number111008
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume141
Issue number10
DOIs
Publication statusPublished - 2019 Nov

Keywords

  • Constant volume law
  • Drawing speed
  • Hollow sinking
  • Sheet and tube metal forming
  • Slab method
  • Wall thickness reduction

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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