Preliminary Investigation of Micro-V-Bending

Abstract

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.

Analisis Aspek Struktural Program Bimbingan dan Konseling: Studi Kasus di Sekolah Menengah Atas Kota Bandung

“…Misi yang keempat adalah meningkatkan keterampilan belajar efektif, ini berkaitan dengan bimbingan belajar. Menurut Santi et al (2017) Berdasarkan hasil wawancara bahwa terkadang ada peserta didik yang datang bukan berdasarkan pada kebutuhan yang telah di asesmen, maka setidaknya guru BK perlu memiliki berbagai kompetensi konselor sehingga hal tersebut bisa ditangani dengan baik. Selain itu, aspek kebutuhan lain yang tidak kalah penting adalah bagaimana mendukung program pemerintah melalui Kurikulum Merdeka dengan mencegah terjadinya 3 dosa besar Pendidikan seperti bullying, kekerasan seksual, dan intolerasi, ditambah dengan pencegahan terhadap obat-obatan terlarang, ini jelas perlu ditekankan karena memiliki dampak negatif yang akan ditimbulkan bagi peserta didik yang mengalami hal tersebut (baik korban maupun pelaku).…”

Experimental and Numerical Investigation of the Effect of Different Temperature and Deformation Speeds on Mechanical Properties and Springback behaviour in Al-Zn-Mg-Cu Alloy

“…Particularly, it is more problematic in the assembled parts such as B pillar in automobiles. Factors such as punch radius, lubricant, punch speed, crushing force, dwell time, grain size, thickness are effective on springback [18][19][20][21][22]. Various strain rates are used for forming sheet metal.…”

“…In another study, it is shown that the increase of the punch speed at three different high-strength steel almost does not affect the springback in the bending process using the V-die [18]. Kiswanto et al [19] performed a springback study on different parameters in the V bending die. They showed that with the increase of the punch speed, the amount of springback decreased.…”

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

“…Micro sheet metal forming is one of the most popular fields to be observed since it has been widely applied in producing micro-parts. Micro-bending is one of the basic forming processes that produce a micro-component with 3D contours, such as contacts/switches for micro-electrics , mechanical sensors, and housing for optical devices (Kiswanto et al, 2017). In sheet metal manufacturing technology, bending is defined as a straining process of flat strip material around a linear axis (Qin, 2010).…”