A flexible shear spinning of axi-symmetrical shells with a general-purpose mandrel

“…Peter and David studied the flow-forming method for internally geared wheels [ 14 ]. Kawai et al explored the shear spinning method for hemispherical shells and discovered that the common sine law was not appropriate for this condition [ 15 ]. Therefore, it could be observed that the main research methods for metal spinning were numerical simulations and experiments, which were also utilized in this study.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Groove Shape Variation during Steel Sheave Spinning

et al. 2018

View full text Add to dashboard Cite

Large sheaves, such as crosshead sheaves, are foundation parts in the heavy industry. Counter-roller spinning steel sheaves are utilized to replace traditional casting iron parts. Few studies exist on the groove shape of these spinning sheaves. Consequently, it is significant to explore the spinning groove shape variation rule and confirm the appropriate spinning parameters. Both experimental and numerical methods were utilized to study the groove shape variation of Q235 steel sheaves and their results were well matched. Spring-back phenomena were considered in this study. The groove depth was lower than the spinning depth and the last formed groove was the deepest. The former groove depth would be affected by the adjacent following spinning process. The single groove spinning result was linearly dependent on the multiple spinning groove depth. Certain equations were used to calculate the groove depth. The bottom–middle–top spinning sequence, which was better than other spinning sequences, should be used in the sheave spinning method. A sheave spinning process could be designed based on the study to obtain a fine groove shape.

show abstract

“…This greatly limits the application of those research results. The die-less spinning which was proposed by Kawai et al (2007) is developed from the conventional spinning. Kawai et al (2001) developed the process by research on the die-less spinning of truncated conical shells and hemispherical shells.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the effects of roller paths on dimensional precision in die-less spinning of sheet metal

Jin

et al. 2014

J. Zheijang Univ.-Sci.

View full text Add to dashboard Cite

Die-less spinning eliminates the dependence upon the mandrel of traditional spinning, but bringing about comparatively poor dimensional accuracy which needs to be improved. In this paper, roller paths in the first pass of die-less spinning, including concave, convex, linear and combined ones are parameterized according to the degree of bending and their effects on dimensional precision (thickness variation and shape deviation) have been studied by using experiments of finite element (FE) analysis. The effects of roller paths on thickness variation, shape deviation, tool forces, and stress and strain variations have been analyzed numerically. The results showed that for concave roller paths, the thickness variation is not very sensitive to the degree of bending, while a low degree of bending of the roller path can result in a low shape deviation. For convex roller paths, a low degree of bending leads to both low thickness reduction and low shape deviation. Further research shows that a combined roller path with convex-concave curve could contribute a low shape deviation, while an inverse combined roller path gives better thickness precision.

show abstract

A flexible shear spinning of axi-symmetrical shells with a general-purpose mandrel

Cited by 24 publications

References 2 publications

A review of the mechanics of metal spinning

A review of the mechanics of metal spinning

Investigation of Groove Shape Variation during Steel Sheave Spinning

A numerical study of the effects of roller paths on dimensional precision in die-less spinning of sheet metal

Contact Info

Product

Resources

About