MAKALAH Mesin Frais (M i l l i n g)
Diajukan Untuk Memenuhi Tugas Mata kuliah Proses Produksi
Disusun Oleh : Kharisma Alfiansyah 201302012
POLITEKNIK ENJINERING INDORAMA PROGRAM STUDI TEKNIK MEKATRONIKA PURWAKARTA 2014
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KATA PENGANTAR
Alhamdulillahirobbil’alamin … Puji syukur syukur penyusun panjatkan kepada allah SWT
kerena rahmat dan
pertolongan – Nya. Tugas pembuatan makalah tentang Mesin frais ini telah selesai, penyusun juga mengucapkan terimakasih kepada semua pihak yang telah membantu dalam penyusunan makalah ini. Makalah ini berisi mulai dari definisi Mesin Frais, klasifikasi beserta contoh dan bagaimana cara mengoperasikannya. Penyusun berharap semoga makalah ini dapat bermanfaat bagi para pembaca. Amin
Purwakarta, Juni 2014
Penyusun
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DAFTAR ISI
KATA PENGANTAR ........................................................................................... ii DAFTAR ISI ......................................................................................................... iii DAFTAR GAMBAR ................................................. ................................................. ............................................. v BAB I PENDAHULUAN ...................................................................................... 1
1.1. Latar Belakang ............................................................................. .......... 1 1.2. Tujuan .............................................. ....................................................... 2 BAB II PEMBAHASAN ....................................................................................... 3
2.1 Dasar Teori Mesin Frais (milling machine) ............................................ 3 2.2 Jenis-Jenis Mesin Frais ............................................... ............................ 4 2.3 Bagian-Bagian Dari Mesin Frais Mesin Frais ............................................................ 7 2.4 BagianBagian- bagian utama mesin frais dan fungsinya fungsinya .................................... 9 2.5 Fungsi Mesin Frais ...................................................... ................................................................................ .......................... 12
2.6 Perlengkapan Mesin Frais .................................................... ...................................................................... .................. 13 2.7 Macam – Macam – Macam Macam Pahat Frais Frais ............................................... .................. 16 2.8 Cara Kerja Mesin Frais (Milling (Milling Machine) .......................... .................. 17
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2.11 Perencanaan Perhitungan pada mesin frais .......................................... 19
BAB III PENUTUP ........................................................................................... 26
3.1.
Kesimpulan ................................................. ................................... 26
3.2.
Saran ................................................... ............................................ 27
DAFTAR PUSTAKA ..................................................... ........................................................................................ ................................... 28
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DAFTAR GAMBAR
-
Gambar 2.7 Knee/lutut ............................................................................................
-
.... ..................................................... ..................................................... ................................. ...... Gambar 2.8 Alas Mesin ...............................
-
Gambar 2.9 Arbor ...............................................................................................
-
Gambar 2.10 Stub arbor ................................................ .....................................
-
Gambar 2.11 Collet chuck ..................................................................................
-
Gambar 2.12 Ragum/Catok ................................................................................
-
Rotary Table) Table) ............................................................ Gambar 2.13 Meja putar ( Rotary
-
Gambar 2.14 Kepala pembagi. ...........................................................................
-
Gambar 2.15 Macam-macam klem ................................................. ...................
-
Gambar 2.16 Pelat/piring pembagi dengan alur V .............................................
-
Gambar 2.17 Kepala pembagi universal ................................................... .........
-
Gambar 2.18 Pelat/piring pembagi .....................................................................
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BAB I PENDAHULUAN 1.1. Latar Belakang
Mesin Milling ditemukan oleh Eli Whitney sekitar tahun 1818. Mesin Milling ini melakukan operasi produksi suku cadang duplikat yang pertama dengan pengendali secara mekanik arah dan gerakan potong dari perkakas mata potong jamak yang berputar. Mesin Milling melemparkan logam ketika benda kerja dihantarkan terhadap suatu pemotong yang berputar. Pemotong Milling memiliki satu deretan mata potong pada kelilingnya yang masing-masing berlaku sebagai pemotong tersendiri pada daur putaran. Benda kerja dipegang pada meja yang mengendalikannya, antaranya terdapat pemotong mesin Milling tersebut. Mesin Milling adalah mesin yang paling mampu melakukan banyak tugas dari segala mesin perkakas. Permukaan yang datar maupun berlekuk dapat dimesin dengan penyelesaian dan ketelitian istimewa. Pemotong sudut, celah, roda gigi,dan ceruk dapat dapat digunakan dengan menggunakan berbagai pemotong. Pahat gurdi, peluas lubang, dan bor dapat dipegang dalam soket arbor dengan melepaskan pemotong dan arbor. Karena semua gerakan meja mempunyai penyetelan mikrometer, maka lubang dan pemotongan yang lain dapat diberi jarak secara cepat. Operasi pada umumnya dilakukan oleh ketam, gurdi, mesin pemotong roda gigi, dan mesin peluas lubang dapat dilakukan pada mesin milling. Mesin ini membuat penyelesaian dan lubang yang lebih baik sampai pada batas ketelitian dengan jauh lebih baik daripada mesin sekrap. Pemotong berat dapat diambil tanpa banyak merugikan pada penyelesaian atau ketepatannya.
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1.2 Tujuan - Mengetahui apa itu mesin milling - Mengetahui prinsip kerja mesin Milling. - Mengetahui bagian-bagian dari mesin milling beserta fungsinya masing-masing. - Mengetahui jenis dan macam-macam mesin Milling. - Mengetahui jenis alat bantu yang digunakan. - Dapat merencanakan perhitungan pada mesin milling
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BAB II PEMBAHASAN
2.1 Dasar Teori Mesin Frais (milling machine)
Mesin frais merupakan salah satu mesin konvensional yang mampu mengerjakan suatu benda kerja dalam permukaan sisi datar, tegak, miring, bahkan alur roda gigi. Mesin perkakas ini mengerjakan atau menyelesaikan suatu benda kerja dengan menggunakan pisau milling (cutter) pemasukan media dikembangkan, computer processing power dan kapasitas memori terus meningkat, dan mesin-mesin NC dan CNC berangsur-angsur dirubah dari level perusahaan yang besar ke level perusahaan yang medium (menengah). Pengerjaan logam dalam dunia manufacturing ada beberapa macam, mulai dari pengerjaan panas, pengerjaan dingin, hingga pengerjaan secara mekanis. Pengerjaan mesin mekanis loagam biasanya digunakan untuk pengerjaan lanjutan maupun pengerjaan finishing, sehingga dalam pengerjaan mekanis dikenal beberapa prinsip pengerjaan, salah satunya adalah pengerjaan perataan permukaan dengan menggunakan mesin frais atau biasa juga disebut mesin milling. Mesin milling adalah mesin yang paling mampu melakukan banyak tugas bila dibandingkan dengan mesin perkakas yang lain. Hal ini disebabakan karena selain mampu memesin permukaan datar maupun berlekuk dengan penyelesaian dan ketelitian
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mengatur gerakan dari mejanya, maka lubang dan pemotongan yang lain dapat diberi jarak secara tepat. Mengefrais adalah mengerjakan logam dengan mesin yang menggunakan pemotong yang berputar yang mempnyai sejumlah mata poting.Ada dua jenis pahat frais yang paling banyak digunakan yaitu : horizontal, pahat frais dipasang pada sumbu utama horizontal.Yang kedua vertikal pahat frais dipasang pada ujung spindel vertikal.Frais atau milling horizontal merupakan suatu proses pemakanan benda kerja yang pengerjaannya atau kenyataannya dilakukan dengan menggunakan pahat yang berputar oleh poros spindel mesin.Pahat frais (milling cutter)termasuk jenis pahat bersisi potong banyak(multiple point tool). 2.2 Jenis-Jenis Mesin Frais 1) Mesin frais tegak (vertikal)
Mesin frais tegak adalah suatu mesin frais yang arbornya tegak (vertikal) seperti gambar , sedang mejanya dapat bergerak ke arah a.
memanjang/longitudinal memanjang/longitudinal
b.
melintang /cross /cross slide dan slide dan naik turun
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Bagian-bagian mesin frais tegak: a. Spindel
e. Engkol ke arah memanjang
b. Kepala
f. Engkol ke arah naik dan turun
c. Tuas otomatis
g. Alas mesin
d. Kolom
h. Handel ke arah melintang
2)
Mesin frais mendatar (horizontal)
Mesin frais horisontal, dibedakan lagi menurut fungsinya yaitu: a. Mesin frais sederhana (Plain milling machine) machine) b. Mesin frais universal (Universal milling machine)
Mesin frais mendatar/horisontal adalah suatu mesin frais yang arbornya mendatar seperti gambar , sedang mejanya dapat bergerak ke arah a.
memanjang/longitudinal
b.
melintang /cross /cross slide dan slide dan naik turun
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Bagian-bagian mesin frais horizontal diantaranya: a. Lengan penahan arbor
l. Ulir pendukung
b. Tuas otomatis meja memanjang
m. Alas bodi
c.
n. Tuas pengunci sadel
Meja/bed Meja/bed machine
d. Handel penggerak meja
o. Tuas kecepatan arah otomatis meja melintang
memanjang e. Tuas pengunci meja mesin
p. Dudukan meja/bede meja/bede machine
f. Handel penggerak meja melintang
q. Body Machine
g. Tuas pengatur feeding
r. Tiang (colom)
h. Tuas pengatur feeding
s. Spindel mesin
i. Engkol untuk ke arah naik/ turun
t. Lengan msin
j. Engkol untuk ke arah naik turun
u. Lengan penahan arbor
k. Lutut
v. Tombol ON/OF
3) Mesin frais universal
Mesin frais universal adalah suatu mesin frais dengan kedudukan arbornya
mendatar
dan
gerakan
mejanya
dapat
kearah
memanjang/longitudinal memanjang/longitudinal , melintang/ cross cross slide, naik turun dan dapat diputar membuat sudut tertentu terhadap body mesin. (gambar 2.3)
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Bagian-bagian mesin frais universal: a.
Lengan
k.
Tuas pengunci meja
b.
Penyokong arbor
l.
Tabung pendukung
c.
Tuas otomatis
m. Lutut (knee)
d.
Nok pembatas
n.
Tuas pengunci sadel
e.
Meja mesin
o.
Alas meja
f.
Engkol ke arah memanjang
p. Tuas perubah kecepatan motor listrik
g.
Tuas pengunci
S.
Tuas penunjuk kecepatan putaran
h.
Baut penyetel
T.
Tiang (colom)
i.
Engkol ke arah melintang
U. Spindel mesin
j.
Engkol untuk ke arah naik turun
V. Tuas untuk menjalankan spindel
2.3 Bagian-Bagian Dari Mesin Frais
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A. Lengan, untuk memindahkan arbor. B. Penyokong arbor. C. Tuas, untuk menggerakan meja secara otomatis. D. Nok pembatas, untuk membatasi jarak gerakan otomatis. E. Meja mesin, tempat untuk memasang benda kerja dan perlengkapan mesin. F. Engkol, untuk menggerakan meja dalam arah memanjang. G. Tuas pengunci meja. H. Baut penyetel, untuk menghilangkan getaran meja. I. Engkol, untuk menggerakan meja dalam arah melintang. J. Engkol, untuk menggerakan lutut dalam arah tegak. K. Tuas untuk mengunci meja.
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2.4 Bagian- bagian utama mesin frais dan fungsinya
Mesin frais kontruksinya berbeda-beda, tetapi pada prinsipnya mesin ini mempunyai beberapa beberapa komponen komponen utama, utama, yaitu: yaitu: a. Kolom mesin/badan mesin Badan mesin ini adalah berdiri tegak dan kokoh karena ia dipakai sebagai patokan dan merupakan merupakan dudukan dan rumah dari roda gigi. Selain dari itu juga akan jadi dudukan dari sumbu sumbu utama, bahkan untuk jadi dudukan motor dan puli-puliny puli-pulinyaa itulah ditempatkan.Bagian depan yang dikerjakan secara masinal, adalah bebentuk ekor burung tegak yaitu untuk gerak turun naiknya knee yang membawa sadel dan meja. Pada bagian sebelah atas kolom ini dipasang sumbu utama/spindel untuk dudukan dan membawa arbor sebagai pemegang dari pisau frais frais itu sendiri, sendiri, sehingga sehingga dapat berputar. Pada bagian bagian atas juga dibuat alur ekor burung mendatar mendatar yaitu yaitu untuk dudukan lengan, lengan, dan arm ini dapat didorong didorong maju ataupun mundur untuk mencapai kedudukan tertentu.
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Pergerakan ke kiri atau ke kanan dari meja ini dengan bantuan memutar sumbu transportir yang mempunyai kisar tertentu, yaitu ada yang 5 atau 6 mm ada juga yang berukuran berukuran inchi. inchi. Apabila Apabila perlu meja ini dapat dikunci dikunci kepada sadel dan untuk pengefraisa pengefraisan n dengan pemakanan pemakanan menurun/Cli menurun/Climb mb milling, milling, maka pada meja mesin ini dipasang backlash eliminator untuk menahan loncatan dari meja karena pemakanan.
Gambar 2.5 Meja mesin Frais
d. Sadel/dudukan meja Sadel ini bentuknya persegi artinya mempunyai ukuran lebar sama dengan ukuran
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Gambar 2.6 Sadel Mesin Frais
sadel
e. Knee/Lutut Knee/Lutut Lutut ini adalah mempunyai dua alur ekor burung yang saling tegak lurus, yaitu satu alur dipaskan kepada kolom dan satunya lagi dipaskan kepada sadel itu tadi.Lutut ini berbentuk rongga, dan dalam rongga itulah dipasang roda-roda gigi untuk gerakan otomatis, mundur maju, naik turun dan kiri kanan. Gerakan dari lutut ini hanya dua arah yaitu turun dan naik saja, lutut ini juga dapat dikuncikan kepada kolom, agar
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mesin, seperti berat mesin ditambah berat bahan yang dikerjakan dan berat perlengkapan perlengkapan yang dipakai serta berat dari alas itu sendiri.Pada sendiri.Pada alas mesin mesin ini dibuat rongga sebagai bak penampung, yaitu untuk menampung cairan pendingin. Pompa air untuk mengalirkan cairan pendingin kepada cutter dan benda kerja, juga dipasang pada alas ini untuk membuat sirkulasi air pendingin itu tadi.
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d. Roda gigi cacing e. Nok/eksentr Nok/eksentrik ik f.
Ulir scolor (ulir pada bidang datar)
g. Ulir cacing yang mempunyai kisar besar dan tidak mampu dikerjakan di mesin bubut.
2.6 Perlengkapan Mesin Frais
Untuk menunjang berbagai macam jenis pekerjaan pada mesin frais, mesin ini dilengkapi beberapa perlengkapan diantaranya:
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Coll et Chuck
Collet chuck digunakan sebagai pengikat alat potong/pisau ( End End mill, Slot drill dll), yang dipasang pada spindel utama atau tegak. Jadi posisinya dapat dipasang dalam posisi mendatar (horisontal (horisontal ) atau tegak vertikal. Gambar vertikal. Gambar 2.11
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Kepala Pembagi ( Di viding Head ) Head
Kepala pembagi (dividing (dividing head ) adalah peralatan mesin frais yang digunakan untuk membentuk segi-segi yang beraturan pada poros benda kerja . Peralatan ini biasanya dilengkapi dengan plat pembagi yang berfungsi untuk membantu pembagian yang tidak dapat dilakukan dengan pembagian langsung. (Gambar 2.14).
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2.7 Macam – Macam Macam Pahat Frais
Ada bermacam – bermacam – macam macam pahat pada mesin frais. Berikut ini jenis pahat frais adalah: - Pahat Silindris
Pahat ini digunakan untuk menghasilkan permukaan horizontal dan dapat mengerjakan permukaan yang lebar dan pekerjaan berat - Pahat Muka dan Sisi
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- Shell and Mill
Kelopak ujung frais dibuat untuk disesuaikan di bar pendek yang dipasang di
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E. Menempatkaan benda kerja yang akan di frais pada meja kerja F.
Mencari titik permukaan/titik nol dan kemudian melakukan pemakanan untuk
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menggunakan mesin frais datar. Pengefraisan Muka
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Tabel 4.1 Kecepatan Potong Untuk Beberapa Jenis Bahan. No
Bahan Benda Kerja
Cs ( m/ menit )
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D = Diameter cutter ( mm ) π = Konstanta ( 3,14 )
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