OPERASI-OPERASI PERMESINAN
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Transcript of OPERASI-OPERASI PERMESINAN
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OPERASI-OPERASI PERMESINAN
1Operasi Permesinan
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Operasi Permesinan 2
Turning
N = rotational speed, rev/minv = 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/min
Dv
N0
dDD f2
0
Nffr
fTr
m
L vfdMRR
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Operasi Permesinan 3
Operasi Turning Lainnya
(a) facing (b) taper turning (c) contour turning (d) form turning (e) chamfering (f) cutoff (g) threading (h) boring (i) drilling (j) knurling
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Operasi Permesinan 4
Mesin Lathe
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Operasi Permesinan 5
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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Operasi Permesinan 6
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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Operasi Permesinan 7
Drilling
N = spindle speed, rev/minv = cutting speed, mm/minD = 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 Permesinan 8
Operasi Drillling Lainnya
(a) reaming (b) tapping (c) counter boring (d) countersinking (e) center drilling (f) spot facing
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Operasi Permesinan 9
Mesin Drilling
Drill press & Radial drill press
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Operasi Permesinan 10
Milling
• Horizontal milling• Vertical milling
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Operasi Permesinan 11
Horizontal Mill
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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Operasi Permesinan 12
Vertical Mill (2)
Vertical boring mill
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Operasi Permesinan 13
Milling
Types of milling operation: (a) peripheral or plain milling (b) face milling
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Operasi Permesinan 14
Peripheral Milling
(a) slab milling (b) slotting (c) side milling (d) straddle milling
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Operasi Permesinan 15
Tipe Pemotongan Milling
(a) up milling (b) down milling
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Operasi Permesinan 16
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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Operasi Permesinan 17
Parameter Pemesinan Milling
• Nt = number of teeth
fT
fnf
r
m
r
tr
AL
dDdA
wdMRR
fN
D
vN
)(
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Operasi Permesinan 18
Mesin Milling (1)
(a) horizontal (b) vertical
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Operasi Permesinan 19
Mesin Milling (2)
(a) universal-overarm (b) ram type
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Operasi Permesinan 20
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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Operasi Permesinan 21
Turning Centers
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Operasi Permesinan 22
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 Permesinan 23
Operasi Milling Lainnya
(a) shaping (b) planning
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Operasi Permesinan 24
Bentuk-bentuk Shaping & Planing
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Operasi Permesinan 25
Mesin Shaper
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Operasi Permesinan 26
Mesin Planer
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Operasi Permesinan 27
Operasi Milling Lainnya
Broaching
(a) external broaching (b) internal broaching
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Operasi Permesinan 28
Sawing
(a) power hacksaw (b) bandsaw (c) circular saw
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Operasi Permesinan 29
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