Abstract
Bending in sheet metal forming is defined as uniformly straining process around a linear axis. A V-bending process is normally used in sheet metal working due to the tool and process simplicity. The main problem in bending process is a springback occurrence which causes an error in part dimension. In a micro level, the springback angle is difficult to be assessed because of the influence of size effects in all aspects of the system. The springback behavior has been investigated in many previous kinds of research. However, the springback correction is still needed to be studied extensively so that it can be implemented reliably in micro-bending. The purpose of this research is to investigate the influence of punch velocity and holding time to the springback angle. The process is performed to the 0.1 mm thickness of copper foil. The punch velocities are 0.1 mm/s, 1 mm/s, and 10 mm/s. While the variation of holding time, which is set during the bottoming stage, are 7 s, 9 s, and 11 s. The result shows that the punch velocity clearly influences the springback angle. In addition, the holding time during the bottoming stage is a potential factor in springback angle correction.
Highlights
With the increasing of micro-parts demand due to the trend towards miniaturization, many kinds of research have been encouraged to conduct a development of a micro-manufacturing system and investigate the process at the micro level
In the micro V-bending experiment, the measured springback showed difference relating to the punch velocity and holding time variation
The results show that the determined process parameters can improve the product quality in the micro process
Summary
With the increasing of micro-parts demand due to the trend towards miniaturization, many kinds of research have been encouraged to conduct a development of a micro-manufacturing system and investigate the process at the micro level. One of the favorite methods for producing a micro-part is micro sheet metal forming. Bending is a basic configuration forming process in producing 3D profiles of micro-parts such as microelectric contacts/switches, mechanical sensors and 3D sheet metal profile for optical devices housing. Bending in sheet metal forming is defined as a straining process of metal around a straight axis [1]. The top section of material may be stretched while the bottom section is compressed. The most widely used in bending process are U-bending and V-bending
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