Post on 18-Apr-2018
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Departemen Teknik Industri FTI-ITB
TI-2121: Proses Manufaktur
Operasi Pemesinan & Mesin Perkakas
LaboratoriumLaboratorium SistemSistem ProduksiProduksiwww.lspitb.orgwww.lspitb.org
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Departemen Teknik Industri FTI-ITB
1. Hasil Pembelajaran• Umum:
Memberikan mahasiswa pengetahuan yang komprehensif tentang dasar-dasar proses pemesinandan mesin perkakas, proses forming dan molding, metrology dan aplikasi terhadap kualitas produk dananalisis system manufaktur.
• Khusus:Memberikan pemahaman terhadap proses pemesinanserta jenis mesin yang digunakan
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Departemen Teknik Industri FTI-ITB
Istilah
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Departemen Teknik Industri FTI-ITB
Klasifikasi Komponen Pemesinan
(a) rotational (b) non-rotational (prismatic)
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Departemen Teknik Industri FTI-ITB
Bentuk Permukaan Potong
(a) straight turning (b) taper turning (c) contour turning (d) plain milling (e) profile milling
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Departemen Teknik Industri FTI-ITB
Forming: Bentuk Pemotongan
(a) form turning (b) drilling (c) broaching
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Departemen Teknik Industri FTI-ITB
Kombinasi Forming dan Pergerakan Pahat
(a) thread cutting on a lathe (b) slot milling
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Departemen Teknik Industri FTI-ITB
Turning
N = rotational speed, rev/min
v = cutting speed, m/minD0 = original diameter, mmDf = final diameter, mmd = depth of cutf = feed, mm/revfr = feed rate, mm/minTm = time of actual
machining, minL = length, mmMRR = material removal
rate mm3/minDvN
0π=
dDD f 20 =−
Nff r=
fTr
m
L= vfdMRR =
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Departemen Teknik Industri FTI-ITB
Operasi Turning Lainnya
(a) facing (b) taper turning (c) contour turning (d) form turning (e) chamfering (f) cutoff (g) threading (h) boring (i) driliing(j) knurling
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Departemen Teknik Industri FTI-ITB
Mesin Lathe
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Departemen Teknik Industri FTI-ITB
Metoda Pencekaman Benda Kerja Pada Lathe
(a) mounting the work between centers using a “dog” (b) three-jaw chuck (c) collet (d)face plate for non cylindrical
workparts
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Departemen Teknik Industri FTI-ITB
Contoh Urutan Operasi Turning
(1) feed stock to stop (2) turn main diameter (3) form second diameter and spotface (4) drill (5) chamfer (6) cutoff
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Departemen Teknik Industri FTI-ITB
Boring Mill (1)
Types of horizontal boring mill (a) boring bar is fed into a rotating workpart (b) work is fed past a rotating boring bar
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Departemen Teknik Industri FTI-ITB
Boring Mill (2)
Vertical boring mill
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Departemen Teknik Industri FTI-ITB
Boring Mill (3)
Boring bar made of cemented carbide
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Departemen Teknik Industri FTI-ITB
Drilling
N = spindle speed, rev/min
v = cutting speed, mm/min
D = drill diameter, mmf = feed, mm/revFr = feed rate, mm/minTm = machining time,
minT = work thickness, mmA = approach allowanceMRR = material rate of
return
DvNπ
=
Nff r= fT
r
m
At +=
)2
90tan(5.0 φ−= DA fT
r
m
d=
4
2 fD rMRRπ
=
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Departemen Teknik Industri FTI-ITB
Operasi Drillling Lainnya
(a) reaming (b) tapping (c) counter boring (d) countersinking (e) center drilling (f) spot facing
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Departemen Teknik Industri FTI-ITB
Mesin Drilling
Drill press & Radial drill press
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Departemen Teknik Industri FTI-ITB
Milling
Types of milling operation: (a) peripheral or plain milling (b) face milling
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Departemen Teknik Industri FTI-ITB
Peripheral Milling
(a) slab milling (b) slotting (c) side milling (d) straddle milling
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Departemen Teknik Industri FTI-ITB
Tipe Pemotongan Milling
(a) up milling (b) down milling
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Departemen Teknik Industri FTI-ITB
Face Milling
(a) conventional face milling
(b) partial face milling
(c) end milling (d) profile milling (e) pocket milling (f) surface
contouring
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Departemen Teknik Industri FTI-ITB
Parameter Pemesinan Milling
• Nt = number of teeth
fT
fnf
r
m
r
tr
ALdDdA
wdMRR
fNDvN
+=
−=
=
=
=
)(
π
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Departemen Teknik Industri FTI-ITB
Mesin Milling (1)
(a) horizontal (b) vertical
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Departemen Teknik Industri FTI-ITB
Mesin Milling (2)
(a) universal-overarm (b) ram type
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Departemen Teknik Industri FTI-ITB
Machining Centers
• Automated machine tool capable of performing multiple machining operation under CNC control, having features:
Automatic tool-changingPallet shuttlesAutomatic workpartpositioning
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Departemen Teknik Industri FTI-ITB
Turning Centers
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Departemen Teknik Industri FTI-ITB
Operasi pada Mill-Turn Centers
(1) turn second diameter (2) mill flat with part in programmed angular position (3) drill hole (4) cutoff
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Departemen Teknik Industri FTI-ITB
Operasi Milling Lainnya
(a) shaping (b) planning
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Departemen Teknik Industri FTI-ITB
Bentuk-bentuk Shaping & Planing
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Departemen Teknik Industri FTI-ITB
Mesin Shaper
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Departemen Teknik Industri FTI-ITB
Mesin Planer
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Departemen Teknik Industri FTI-ITB
Operasi Milling Lainnya
• Broaching
(a) external broaching (b) internal broaching
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Departemen Teknik Industri FTI-ITB
Sawing
(a) power hacksaw (b) bandsaw (c) circular saw
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Departemen Teknik Industri FTI-ITB
High Speed Machining
Solid Tools (end mills, drill) Indexable Tools (face mills) Work Material Conventional
Speed (m/min) High Cutting
Speed (m/min) Conventional
Speed (m/min) High Cutting
Speed (m/min) Aluminum 300 3000 600 3600 Cast iron, soft 150 360 360 1200 Cast iron, ductile 105 250 250 900 Steel, free machining 105 360 360 600 Steel, alloy 75 250 210 360 Titanium 40 60 45 90
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Departemen Teknik Industri FTI-ITB
Tugas 51. Pilih sebuah komponen nyata yang memiliki proses
turning.Sketsa kondisi material awal dan setiap tahap prosespemotongan hingga bentuk akhir produk.Tentukan parameter pemesinannya; jika v=2.5m/s, f=0.3mm/rev.Dikumpulkan di LSP Kamis, 6 November 2003 jam 12.00
2. Pilih sebuah komponen nyata lainnya yang memiliki prosesmilling
Sketsa kondisi material awal dan setiap tahap prosespemotongan hingga bentuk akhir produk.
• Tentukan diameter pahat yang cocok untuk setiap prosespemesinan komponen tersebut
• Tentukan parameter pemesinannya• Dikumpulkan di LSP Kamis, 13 November 2003 jam 12.00