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SUMMARY:AN EXPERIMENTAL STUDY OF FORWARD AND BACKWARD TOOLPASSES IN CONVEN
 TIONAL SPINNING - Iacopo Russo\, PhD Candidate\, Engineering Department
DTSTART:20180302T150000Z
DTEND:20180302T160000Z
UID:TALK101581@talks.cam.ac.uk
CONTACT:Karen Mitchell
DESCRIPTION:In conventional metal spinning\, a tool follows a path compose
 d of multiple forward and backward passes to form a spinning circular blan
 k and produce axisymmetric components. The process is limited by two key w
 orkpiece failure types: wrinkling and excessive thinning leading to cracki
 ng. No precise rules have been established yet for toolpath design to avoi
 d workpiece failure for a variety of shapes and materials. Therefore\, too
 lpath generation today is still performed by trial and error. Although the
  effect of many toolpath parameters on the likelihood of failure has been 
 investigated\, very little evidence has been collected on the comparison b
 etween forward and backward toolpasses. Therefore\, this study experimenta
 lly compares their effect on tool forces\, thickness profile and workpiece
  shape. Aluminium cones with a 45° wall are used as starting shapes\; one
  forward and one backward linear passes are performed for two values of to
 olpass distance increment Δz. The results show that a backward pass leads
  to higher thinning than a forward pass\, but may also favour a lower wrin
 kling amplitude at the workpiece edge. Both quantities correlate to how fa
 r the workpiece flange folds back during the pass. Increasing Δz has a bi
 gger impact on the backward pass conditions than on the forward pass
LOCATION: Cambridge University Engineering Department\, LT6
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