Az-Zahra, Rasyidah Salsafira (2023) Analisis Reduksi Respon Getaran Boring Bar Akibat Pengaruh Penambahan Peredam Internal dengan Variasi Jumlah dan Diameter Damper serta Parameter Pemotongan pada Proses Permesinan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kualitas proses boring bisa diukur dari getaran yang terjadi selama proses pengeboran. Getaran ini bisa muncul akibat adanya gesekan antara benda kerja yang berputar dengan mata potong pahat pada boring bar. Getaran yang berlebih bisa menyebabkan penurunan kualitas dan kerusakan pada komponen mesin dalam jangka waktu tertentu. Untuk mengurangi getaran berlebih, diperlukan penambahan peredam pada boring bar. Pada penelitian ini dilakukan simulasi rancangan mekanisme boring bar dengan penambahan damper berbahan dasar metal menggunakan software ANSYS. Simulasi dilakukan pada model yang didesain menggunakan software Solidworks. Boring bar bermaterial AISI 1045 dengan diameter 25 mm dan panjang 282 mm. Damper dengan material yang sama memiliki bentuk silinder pejal yang diletakkan di dalam boring bar sepanjang 235 mm dan diameter damper bervariasi yaitu 3 mm, 4 mm, 5 mm, 6 mm, dan 7 mm. Dilakukan juga variasi jumlah damper yang ditambahkan di dalam boring bar yaitu sebanyak 1 dan 2. Kedua variasi tersebut dilakukan dengan mempertimbangkan mass ratio antara peredam dan sistem utama. Simulasi ini dilakukan dengan variasi cutting parameter diantaranya adalah kecepatan putaran spindle yakni 320, 450, dan 720 RPM, variasi feed rate yakni 0,06; 0,08; dan 0,10 mm/rev dan variasi depth of cut 0,2; 0,3; dan 0,4 mm. Berdasarkan hasil simulasi dengan batasan mass ratio sebesar 1/20, semakin besar ukuran diameter damper dan semakin banyak jumlah damper, maka semakin besar nilai massa dan kekakuan damper sehingga kemampuan meredam getaran semakin meningkat. Semakin besar depth of cut dan feed rate yang digunakan maka nilai respon getaran sistem semakin meningkat, sedangkan semakin besar kecepatan putaran spindle maka nilai respon getaran sistem semakin mengecil. Berdasarkan ukuran damper, customized boring bar 7mm1 merupakan variasi yang paling optimal dimana bisa mereduksi getaran sebesar 66,36%. Berdasarkan jumlah damper, customized boring bar 5mm2 merupakan variasi yang paling optimal dimana bisa mereduksi getaran sebesar 60,52%. Kemudian, seluruh customized boring bar memiliki kemampuan reduksi respon getaran sistem terbesar pada cutting parameter 21 (320 RPM; 0,5 mm; 0,1 mm/rev). Dengan mempertimbangkan gaya eksternal pada seluruh sistem boring bar yang diteliti, variasi paling optimal merupakan variasi yang memiliki kemampuan paling baik dalam meredam getaran arah sumbu-y dimana dilakukan oleh customized boring bar 5mm2 dengan nilai presentase reduksi terbesar senilai 60,52%.
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The quality of the boring process can be measured from the vibrations that occurred during the boring process. This vibration can appear due to friction between the rotating workpiece and the cutting edge of the cutting tool on the boring bar. Excessive vibration can cause a decrease in quality and damage to engine components within a certain period. To reduce the excessive vibration, it is necessary to add damper to the boring bar. In this final project, a simulation of the boring bar mechanism design was carried out with the addition of press-fitted damper using ANSYS software which can reduce vibrations in the boring process. The simulation is carried out on a model designed in advance using Solidworks software. The boring bar with AISI 1045 material has diameter of 25 mm and length of 282 mm. The damper with the same material, AISI 1045, has solid cylindrical shape placed in boring bar with length of 235 mm and diameter of damper that varies to 3 mm, 4 mm, 5 mm, 6 mm, and 7 mm. In addition, the number of dampers added to the boring bar also varies to 1 damper and 2 dampers. Both variations were proposed by considering the mass ratio of damper and main system. This simulation was carried out with variations in cutting parameters including spindle speeds 320, 450, and 720 RPM, variations in feed rate 0.06, 0.08, and 0.10 mm/rev, and variations in depth of cut 0.2, 0.3 and 0.4 mm. Based on the simulation results with maximum allowable mass ratio of 1/20, the larger the diameter of damper and the greater the number of dampers applied, the greater the mass and stiffness of the dampers so that the ability to reduce vibrations increases. The greater the depth of cut and feed rate used, the greater the value of the vibration response, on contrary, the greater the spindle speed, the smaller the value of the vibration response. Based on variations in damper size, customized boring bar 7mm1 is the most optimal variation which can reduce vibration by 66.36%. Based on variations in the number of dampers, customized boring bar 5mm2 is the most optimal variation which can reduce vibration by 60.52%. Then, customized boring bars have the greatest ability to reduce vibration response in cutting parameter 21 (320 RPM; 0.5 mm; 0.1 mm/rev). Considering the external force on the entire boring bar system studied, the most optimal variation is the variation that has the best ability to dampen vibrations in the y-axis direction which is carried out by a 5mm2 boring bar which has the largest percentage reduction value of 60.52%.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Boring bar, Damper, Respon Getaran, Vibration Response |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Rasyidah Salsafira Az-Zahra |
| Date Deposited: | 01 Aug 2023 04:29 |
| Last Modified: | 01 Aug 2023 04:29 |
| URI: | http://repository.its.ac.id/id/eprint/100123 |
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