Author(s):
1. Aljosa Ivanisevic, Faculty of Technical Sciences, Department for Production Engineering, Serbia
2. Dejan Movrin, Faculty of Technical Sciences, Department for Production Engineering, Serbia
3. Igor Kacmarcik, Faculty of Technical Sciences, Department for Production Engineering, Serbia
4. Branko Štrbac, Fakultet tehničkih nauka Univerziteta u Novom Sadu, Serbia

Abstract:
Bending is one of the most common metal forming technology and it can be applied not only in sheet metal forming but also in forming of wire, rods, strip, pipes and bars. However, in car production, ship building and home appliance manufacturing sheet metal bending is most widely employed. One of the most significant sheet metal bending operations is V – Die bending. This process consists of two phases: air bending and coining. At the end of the operation punch removes to the upper position. After unloading, due to elastic recovery, so called “spring-back” or “spring-forward” phenomena occurs. Current paper elaborates negative spring back (“spring forward”) in V – Die bending operations of sheet metal of different thickness and different steel materials. Reasons for spring back phenomena has been clarified. Experimental investigation has been carried out as well as the measurement of workpiece bend angle after deformation. Bending operation has been conducted at Sack&Kiesselbach; hydraulic press and angle measurement at Carl Zeiss CONTURA G2 RDS coordinate measuring machine.

Key words:
V-bending,spring – back,negative spring-back phenomena,experiment

Date of abstract submission:
19.12.2012.

Conference:
DEMI 2013

Applied paper from author