Sheet metal bending is defined as a straining process of flat strip material around a linear axis... more 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.
Journal of Energy, Mechanical, Material and Manufacturing Engineering
The need of micro part become increasingly popular which make increase of the need of prodution t... more The need of micro part become increasingly popular which make increase of the need of prodution technology with high accuracy, productivity, efficiency, and reliability.Metal forming technology offers the solution to answer the challenge. High produtivity, zero material losses, good mechanical properties of product, and tight tolerance is able to achieve by micro forming technology. This thing make metal-forming fit for mass production based on near net shape technology concept it offered.Miniaturized effect phenomena which was not simple on micro-scale manufacturing process, demand high accuracy level from all aspect of micro-manufacturing process, which are material, tool, machinery and process. Therefore, characteristic of micro-forming machine become important in defining reliability of micro-forming system. Micro-forming machine under investigation was 5 kN m-Forming Machine developed in Manufacturing Laboratory, Department of Mechanical Engineering, Universitas Indonesia. Mod...
Bending in sheet metal forming is defined as uniformly straining process around a linear axis. A ... more 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.
Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FC... more Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FCD 50, dengan menggunakan analisis statis pada pembebanan maksimal. Beban maksimal ini diperoleh dari perhitungan pembebanan pada poros depan kendaraan dalam kondisi operasi kendaraan yang direm pada saat berbelok di jalan menurun. Pada analisis pembebanan poros kendaraan sebelumnya diperoleh beberapa nilai pembebanan pada beberapa nilai kecepatan dan deselerasi. Akhirnya, diperoleh nilai deselerasi dan nilai kecepatan maksimum kendaraan dimana kendaraan aman dioperasikan pada saat direm di jalan menurun dan berbelok. Sebagai perbandingan juga dilakukan perhitungan pembebanan poros depan kendaraan pada kondisi operasi kendaraan yang direm pada saat berbelok di jalan mendatar, karena deselerasi yang berbeda untuk masing-masing kondisi operasi, yaitu 0,5g untuk kondisi operasi di jalan mendatar dan 0,2g untuk kondisi operasi di jalan menurun. Hasil perhitungan tetap menunjukkan pembebanan maksimum pada kondisi operasi di jalan menurun. Studi statika diarahkan pada deskripsi kuantitatif dari gaya-gaya yang bekerja pada struktur teknik dalam kesetimbangan.
Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FC... more Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FCD 50, dengan menggunakan analisis statis pada pembebanan maksimal. Beban maksimal ini diperoleh dari perhitungan pembebanan pada poros depan kendaraan dalam kondisi operasi kendaraan yang direm pada saat berbelok di jalan menurun. Pada analisis pembebanan poros kendaraan sebelumnya diperoleh beberapa nilai pembebanan pada beberapa nilai kecepatan dan deselerasi. Akhirnya, diperoleh nilai deselerasi dan nilai kecepatan maksimum kendaraan dimana kendaraan aman dioperasikan pada saat direm di jalan menurun dan berbelok. Sebagai perbandingan juga dilakukan perhitungan pembebanan poros depan kendaraan pada kondisi operasi kendaraan yang direm pada saat berbelok di jalan mendatar, karena deselerasi yang berbeda untuk masing-masing kondisi operasi, yaitu 0,5g untuk kondisi operasi di jalan mendatar dan 0,2g untuk kondisi operasi di jalan menurun. Hasil perhitungan tetap menunjukkan pembebanan maksimum pada kondisi operasi di jalan menurun. Studi statika diarahkan pada deskripsi kuantitatif dari gaya-gaya yang bekerja pada struktur teknik dalam kesetimbangan.
Sheet metal bending is defined as a straining process of flat strip material around a linear axis... more 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.
Journal of Energy, Mechanical, Material and Manufacturing Engineering
The need of micro part become increasingly popular which make increase of the need of prodution t... more The need of micro part become increasingly popular which make increase of the need of prodution technology with high accuracy, productivity, efficiency, and reliability.Metal forming technology offers the solution to answer the challenge. High produtivity, zero material losses, good mechanical properties of product, and tight tolerance is able to achieve by micro forming technology. This thing make metal-forming fit for mass production based on near net shape technology concept it offered.Miniaturized effect phenomena which was not simple on micro-scale manufacturing process, demand high accuracy level from all aspect of micro-manufacturing process, which are material, tool, machinery and process. Therefore, characteristic of micro-forming machine become important in defining reliability of micro-forming system. Micro-forming machine under investigation was 5 kN m-Forming Machine developed in Manufacturing Laboratory, Department of Mechanical Engineering, Universitas Indonesia. Mod...
Bending in sheet metal forming is defined as uniformly straining process around a linear axis. A ... more 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.
Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FC... more Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FCD 50, dengan menggunakan analisis statis pada pembebanan maksimal. Beban maksimal ini diperoleh dari perhitungan pembebanan pada poros depan kendaraan dalam kondisi operasi kendaraan yang direm pada saat berbelok di jalan menurun. Pada analisis pembebanan poros kendaraan sebelumnya diperoleh beberapa nilai pembebanan pada beberapa nilai kecepatan dan deselerasi. Akhirnya, diperoleh nilai deselerasi dan nilai kecepatan maksimum kendaraan dimana kendaraan aman dioperasikan pada saat direm di jalan menurun dan berbelok. Sebagai perbandingan juga dilakukan perhitungan pembebanan poros depan kendaraan pada kondisi operasi kendaraan yang direm pada saat berbelok di jalan mendatar, karena deselerasi yang berbeda untuk masing-masing kondisi operasi, yaitu 0,5g untuk kondisi operasi di jalan mendatar dan 0,2g untuk kondisi operasi di jalan menurun. Hasil perhitungan tetap menunjukkan pembebanan maksimum pada kondisi operasi di jalan menurun. Studi statika diarahkan pada deskripsi kuantitatif dari gaya-gaya yang bekerja pada struktur teknik dalam kesetimbangan.
Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FC... more Tujuan penelitian ini adalah melakukan analisis kekuatan mekanis knuckle, dibuat dari material FCD 50, dengan menggunakan analisis statis pada pembebanan maksimal. Beban maksimal ini diperoleh dari perhitungan pembebanan pada poros depan kendaraan dalam kondisi operasi kendaraan yang direm pada saat berbelok di jalan menurun. Pada analisis pembebanan poros kendaraan sebelumnya diperoleh beberapa nilai pembebanan pada beberapa nilai kecepatan dan deselerasi. Akhirnya, diperoleh nilai deselerasi dan nilai kecepatan maksimum kendaraan dimana kendaraan aman dioperasikan pada saat direm di jalan menurun dan berbelok. Sebagai perbandingan juga dilakukan perhitungan pembebanan poros depan kendaraan pada kondisi operasi kendaraan yang direm pada saat berbelok di jalan mendatar, karena deselerasi yang berbeda untuk masing-masing kondisi operasi, yaitu 0,5g untuk kondisi operasi di jalan mendatar dan 0,2g untuk kondisi operasi di jalan menurun. Hasil perhitungan tetap menunjukkan pembebanan maksimum pada kondisi operasi di jalan menurun. Studi statika diarahkan pada deskripsi kuantitatif dari gaya-gaya yang bekerja pada struktur teknik dalam kesetimbangan.
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