Asrul, Rizki Fachrulan (2018) Pengaruh Axial Depth Of Cut dan Aplikasi Magnet pada Proses Slot Milling Menggunakan Mesin Micromill Terhadap Kekasaran Permukaan Aluminium. Sarjana thesis, Universitas Brawijaya.
Abstract
Slot micromilling adalah sebuah proses permesinan digunakan untuk pembentukan celah atau alur pada bidang permukaan benda kerja. Mesin milling dapat menghasilkan permukaan bidang rata yang cukup halus, namun kendala yang harus dihadapi yaitu chatter. Chatter adalah getaran yang terjadi akbiat interaksi dari proses chip-removal dengan struktur dari pahat, salah satunya adalah regenerative chatter. regenerative chatter terjadi karena fluktuasi cutting force yang menyebabkan tool mengalami displacement. Magnetic damping adalah suatu metode yang dapat meredam regenerative chatter. Pemilihan cutting parameters dapat mempengaruhi tingkat kekasaran permukaan salah satunya yaitu axial depth of cut. Penelitian ini bertujuan untuk mencari pengaruh axial depth of cut dan aplikasi magnet terhadap kekasaran permukaan. Variasi axial depth of cut yang digunakan adalah 0,25 mm, 0,5 mm, 0,75 mm dengn kecepatan spindel 2600 rpm dan feed rate 50 mm/min. Proses slot milling dilakukan ada dua yaitu tanpa magnet dan menggunakan magnet. Hasil dari penelitian ini adalah axial depth of cut berpengaruh terhadap kekasaran permukaan aluminium, dimana semakin besar nilai axial depth of cut yang digunakan, maka semakin tinggi nilai kekasaran permukaan. Ketika menggunakan magnet nilai kekasaran permukaan lebih rendah dari pada nilai kekasaran permukaan tanpa magnet dikarenakan adanya gaya tolak menolak dari magnetic damping. Persamaan non linier dengan magnet Ra = 0,509911868 . ap 0,22925365868096 dan persamaan tanpa magnet Ra = 0,445224192 . ap 0,303905246505329 . Penggunaan magnet sebagai peredam pada proses slot milling memiliki pengaruh dalam menurunkan chatter yang terjadi, yang dilihat dari nilai amplitudo displacement lebih rendah sehingga dapat menurunkan nilai kekasaran permukaan dibandingkan tanpa magnet.
English Abstract
Slot micromilling is known as machinery process that is applied to create gap or pattern on to material surface. Milling machine is able to produce fine surface on flat material, however, chatter might appear as an obstacle. Chatter is the vibration occured because of the interaction between chip-removal process and the chisel structure, one of the chatters is known as regenerative chatter. Regenerative chatter occurs because of the cutting force fluctuation which cause tool to displace. In order to muffle the regenerative chatter, magnetic damping can be one of the methods to be applied. Furthermore, cutting parameters choice can also influence the surface roughness level, for example the axial depth of cut. The objective of the study is to find out the influence of the axial depth of cut and the magnet application toward the surface roughness. The axial depth of cut variations applied were 0,25 mm, 0,5 mm, 0,75 mm with spindle speed at 2600 rpm and feed rate at 50 mm/min. Slot milling process was done two-ways, with and without magnet. The result of this study shows that axial depth of cut affects the aluminium surface roughness, where the higher the axial depth of cut number, then the higher the surface roughness number. With-magnet process produces a smaller number surface roughness rate rather than the without-magnet process since there is a repulsive force from the magnetic damping. Non-linear equation with magnet is Ra = 0,509911868 . ap0,22925365868096 and without magnet is Ra = 0,445224192 . ap0,303905246505329 . Magnet usage to muffle the slot milling process is beneficial in lowering the chatter, it can be seen through the smaller amplitude displacement value which can lower the surface roughness number rather than the without-magnet process.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/FT/2018/594/051807184 |
| Uncontrolled Keywords: | micro milling, magnetic damping, axial depth of cut, regenerative chatter, kekasaran permukaan micro milling, magnetic damping, axial depth of cut, regenerative chatter, surface roughness |
| Subjects: | 600 Technology (Applied sciences) > 671 Metalworking Processes and primary metal products > 671.3 Mechanical working and related processes > 671.35 Machining |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 15 Apr 2019 02:54 |
| Last Modified: | 25 Oct 2021 03:38 |
| URI: | http://repository.ub.ac.id/id/eprint/162903 |
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