week 10 per me sinan
DESCRIPTION
PermesinanTRANSCRIPT
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Operasi Pemesinan & Mesin Perkakas
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Klasifikasi Komponen Pemesinan
(a) rotational (b) non-rotational (prismatic)
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Bentuk Permukaan Potong
(a) straight turning (b) taper turning (c) contour turning (d) plain milling (e) profile milling
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Forming: Bentuk Pemotongan
(a) form turning (b) drilling (c) broaching
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Kombinasi Forming dan Pergerakan Pahat
(a) thread cutting on a lathe (b) slot milling
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Turning
N = rotational speed, rev/min
v = cutting speed, m/minD0 = original diameter, mm
Df = final diameter, mm
d = depth of cutf = feed, mm/revfr = feed rate, mm/min
Tm = time of actual machining, min
L = length, mmMRR = material removal
rate mm3/minDv
N0
dDD f2
0
Nffr
fTr
m
L vfdMRR
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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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Mesin Lathe
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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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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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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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Boring Mill (2)
Vertical boring mill
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Boring Mill (3)
Boring bar made of cemented carbide
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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
D
vN
Nffr fT
r
m
At
)2
90tan(5.0
DA fTr
m
d
4
2 fD rMRR
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Operasi Drillling Lainnya
(a) reaming (b) tapping (c) counter boring (d) countersinking (e) center drilling (f) spot facing
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Mesin Drilling
Drill press & Radial drill press
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Milling
Types of milling operation: (a) peripheral or plain milling (b) face milling
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Peripheral Milling
(a) slab milling (b) slotting (c) side milling (d) straddle milling
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Tipe Pemotongan Milling
(a) up milling (b) down milling
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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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Parameter Pemesinan Milling
• Nt = number of teeth
fT
fnf
r
m
r
tr
AL
dDdA
wdMRR
fN
D
vN
)(
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Mesin Milling (1)
(a) horizontal (b) vertical
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Mesin Milling (2)
(a) universal-overarm (b) ram type
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Machining Centers
• Automated machine tool capable of performing multiple machining operation under CNC control, having features: Automatic tool-
changing Pallet shuttles Automatic
workpart positioning
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Turning Centers
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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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Operasi Milling Lainnya
(a) shaping (b) planning
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Bentuk-bentuk Shaping & Planing
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Mesin Shaper
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Mesin Planer
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Operasi Milling Lainnya
• Broaching
(a) external broaching (b) internal broaching
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Sawing
(a) power hacksaw (b) bandsaw (c) circular saw
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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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Tugas1. Pilih sebuah komponen nyata yang memiliki proses
turning. Sketsa kondisi material awal dan setiap tahap proses
pemotongan 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 proses milling Sketsa kondisi material awal dan setiap tahap proses
pemotongan hingga bentuk akhir produk.• Tentukan diameter pahat yang cocok untuk setiap proses
pemesinan komponen tersebut• Tentukan parameter pemesinannya• Dikumpulkan di LSP Kamis, 13 November 2003 jam 12.00