Strain Analysis of Parts Produced by Multi-Pass Conventional Metal Spinning

Abstract

Sheet metal spinning is one of the forming processes based on gradual shaping of metal blank into an axisymetric part by a roller according to a mandrel. Very significant feature of spinning is ability to produce components with high mechanical properties and high quality of surface layers. The paper brings the results of major true strains analysis of mild steel parts produced by CNC multi-pass conventional metal spinning. The influence of the spindle speed, feed rate, workpiece geometry and planar anisotropy of the blank on the strain distribution of formed part is studied by method of grain size measurement. The design of experiment using the Taguchi approach and analysis of variance (ANOVA) is applied to find optimal process parameters.

The Effect of Process Parameters on Surface Finish of Metal Spun Parts

“…It also offers advantages such as short set-up time and the option of performing several process steps in one single clamping. Lastly, formed parts have high quality surface finish and improved mechanical properties [2][3][4][5].…”

Surface Integrity of Metal Spun Parts

“…Although knowledge about mechanics of spinning, which helps to understand final properties of spun parts, have been developed by systematic investigation of the process using both experimental and theoretical techniques [1,5,6,7,8,9], however the process setup for new spun parts still relies on experienced spinners who use trial-and-error methods. For example several gaps still exist in the prediction of surface integrity factors, where minimum research works was performed in the area of residual stresses.…”