Investigation of the Micro Hardness at the Cut Surface of Fine Blanked Parts with Variation of Sheet Material and Cutting Temperature

Abstract

Fine blanking is a production technology of high importance especially for the automotive industry. As a procedure of sheet metal separation, it is possible to produce complex parts in a single stroke. As a difference to conventional punching, the cutting surface of fine blanked parts can often be used as a functional surface without further process steps. However, fine blanking as a forming process changes the microstructure of the metal sheet to a higher extend than cutting or machining processes. Due to this, it is of utmost importance to investigate the cause-effect-relations between the fine blanking process parameters and the resulting properties of the fine blanked part. Especially the condition of the cut surface as an important quality criterion has to be investigated. The quality characteristics of the cut surface of fine blanked parts are often subject of investigations. In addition, it would be of importance to investigate how the material properties in the shear zone are changed by the fine blanking process. This on one hand in turn can enable conclusions to be drawn about possible punch wear. If, on the other hand, hardening of the cut surface takes place as a result of fine blanking, then this could have a positive influence on the application properties of fine blanked components. Thus, an experimental fine blanking investigation of the micro hardness of the cutting surface has been made with variation of steel material and cutting temperature. It could be demonstrated that the micro hardness increases in direction towards the burr. This is independent on material and cutting temperature.

Design of a new simulative tribotest for warm forming applications having high contact pressure and surface enlargement

“…Lastly, researchers of the laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University have published three works where they showed preliminary results of the newly developed warm assisted fine blanking process. In Shemet 2021, the authors presented final microhardness values obtained after fine blanking S700MC, 42CrMo4 and 16MnCr5 steels [5]. Later in Esaform 2021, same group presented the cutting forces at different temperatures for the X5CrNi18-10 (AISI 304) stainless steel.…”