• International Journal of Technology (IJTech)
  • Vol 8, No 7 (2017)

Punch Force Behavior during Micro V-Bending Process of the Copper Foil

Punch Force Behavior during Micro V-Bending Process of the Copper Foil

Title: Punch Force Behavior during Micro V-Bending Process of the Copper Foil
Gandjar Kiswanto, aida mahmudah, Dedi Priadi

Corresponding email:


Published at : 27 Dec 2017
Volume : IJtech Vol 8, No 7 (2017)
DOI : https://doi.org/10.14716/ijtech.v8i7.747

Cite this article as:
Kiswanto, G., Mahmudah, A., Priadi, D., 2017. Punch Force Behavior during Micro V-Bending Process of the Copper Foil. International Journal of Technology, Volume 8(7), pp. 1314-1320

923
Downloads
Gandjar Kiswanto - Department of Mechanical Engineering Universitas Indonesia
- -
aida mahmudah - Department of Mechanical Engineering , Universitas Indonesia, Depok 16424, Indonesia
--Department of Manufacturing Design Engineering , Politeknik Manufaktur Bandung, Bandung 40135, Indonesia
Dedi Priadi -Department of Metallurgy and Material Engineering , Universitas Indonesia, Depok 16424, Indonesia
Email to Corresponding Author

Abstract
Punch Force Behavior during Micro V-Bending Process of the Copper Foil

Sheet metal bending is defined as a straining process of flat strip material around a linear axis. The micro V-bending process was conducted to investigate its punch force behavior with 0.1 mm thick copper foil. The V-shaped configuration of the punch and die provides a simplicity of tools and an ability to produce different bending angles with a single tool. During the straining of material, a unique force profile, which is related to punch trajectory, occurs. The process was performed with the punch speeds 0.5 mm/s, 1.0 mm/s, 5.0 mm/s and 10.0 mm/s. The results showed that the punch force profile consists of the free-bending stage and the coin-bending stage. In the free-bending stage, the force magnitude was not influenced by the punch speed for the same geometrical and mechanical properties of the sheet material. Furthermore, during the coin-bending stage, the force magnitude increased significantly since the material needed to be bottomed.

Copper foil; Micro V-bending process; Punch force behavior; Punch speed

Conclusion

The results showed that the punch force profile in the micro V-bending process consists of the free-bending force and the bottoming force. Based on the formula of the free-bending force, the factors that can influence the force are the mechanical properties and geometry of the material to be bent. From the experimental results, it was proven that the punch speed did not affect the magnitude of the free-bending force at this stage.

The initiation of the bottoming process occurred very close to the end of the free-bending stage. The force increased significantly after the bending force was obtained at a certain point. At this stage, the force magnitude was clearly affected by the punch speed. The bottoming force increased with increasing punch speed due to the inertia effects of the punch.

For further works, more investigation is required to observe the influence of the punch force on the occurrence of spring back in the bent-part.

References

Boljanovic, V., 2004. Sheet Metal Forming Process and Die Design, 200 Madison Avenue New York, New York 10016, Industrial Press Inc.

Chen, C.-C., Jiang, C.-P., 2011. Grain Size Effect in the Micro-V-bending Process of Thin Metal Sheets. Materials and Manufacturing Processes, Volume 26, pp. 78–83

Gong, F., Guo, B., Wang, C., Shan, D., 2011. Micro Deep Drawing of Micro Cups by using DLC Film Coated Blank Holders and Dies. Diamond and Related Materials, Volume 20(2), pp. 196–200

Hu, Z., Schubnov, A., Vollertsen, F., 2012. Tribological Behaviour of DLC-films and their Application in Micro Deep Drawing. Journal of Materials Processing Technology, Volume 212(3), pp. 647–652

Kiswanto, G., Mahmudah, A., Priadi, D., 2017. Preliminary Investigation of Micro-V-Bending. MATEC Web Conf., Volume 108, 06001

Kiswanto, G., Mahmudah, A., Supriadi, S., 2013. Development and Testing of 5 kN Micro Forming Machine for Micro Part Manufacturing. In: Proceedings of the 13th Quality in Research, 2013 Yogyakarta, Indonesia

Qin, Y., 2010. Micromanufacturing_Engineering_and_Technology, William Andrew

Vollertsen, F., Hu, Z., Niehoff, H.S., Theiler, C., 2004. State of the Art in Micro Forming and Investigations into Micro Deep Drawing. Journal of Materials Processing Technology, Volume 151(1-3), pp. 70–79

Zheng, W., Wang, G., Zhao, G., Wei, D., Jiang, Z., 2013. Modeling and Analysis of Dry Friction in Micro-forming of Metals. Tribology International, Volume 57, pp. 202–209