Study the Effects of Spring Back on Sheet Metal Bending using Mathematical Methods

Abstract

In this study mathematical analysis of spring back was done for optimization of sheet metal bending process. The influence of sheet metal thickness, sheet metal type, friction, tool radius and tool shape on spring back for Aluminium, copper, mild steel and High strength steels, sheet metal have been used as variable to conducted this study. Since, the effects of each variable on the formation of spring back on sheet metal forming are investigated the following way. This empirical result shows that increasing sheet metal thickness from 0.8 mm to 4.5 mm the spring back is reduced 16% and 20.35%. When increasing of sheet metal strength spring back increases because spring back of the sheet should depend on the yield strength of the material. As the materials yield strength increase the spring back after un-loading condition also increases. The effects of material type as shows that, using Aluminium sheet metal instead of high strength sheet metals spring back is reduced by 56.%. Also, for decreasing of the tool radius leads reducing spring back. Spring back of deferential die 12% lower than edge bending die. In addition to these, if increasing the friction coefficient from 0.01 to 0.50 the spring back also increases by 52% because of increasing of friction force and this force generates higher amount of spring back. Thus the effects of material type, tool geometry, working condition and the thickness of sheet metal types were studied and investigated. Since, ultimately utilizing and compensation of tool is considered for prevention of spring back and optimizing of sheet metal bending process as well.

The Development of Exhaust Fan Housing With Ceiling Mounting For High Rise Buildings by Using DFMA

“…The newly developed design with fewer screws has a higher Von Mises stress occurrence than the older design with more screws, but it does a better job of evenly distributing the load throughout the structure. Therefore, the developed design is safe to be applied for long-term applications in terms of construction strength because the spring-back effect from the sheet metal can be suppressed if the load is distributed evenly (Dametew & Gebresenbet, 2017). This paves the way for the design to be used for applications that will last for a significant amount of time.…”