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OPERASI-OPERASI PERMESINAN
1Operasi Permesinan
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
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
Operasi Permesinan 4
Mesin Lathe
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
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
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
Operasi Permesinan 8
Operasi Drillling Lainnya
(a) reaming (b) tapping (c) counter boring (d) countersinking (e) center drilling (f) spot facing
Operasi Permesinan 9
Mesin Drilling
Drill press & Radial drill press
Operasi Permesinan 10
Milling
• Horizontal milling• Vertical milling
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
Operasi Permesinan 12
Vertical Mill (2)
Vertical boring mill
Operasi Permesinan 13
Milling
Types of milling operation: (a) peripheral or plain milling (b) face milling
Operasi Permesinan 14
Peripheral Milling
(a) slab milling (b) slotting (c) side milling (d) straddle milling
Operasi Permesinan 15
Tipe Pemotongan Milling
(a) up milling (b) down milling
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
Operasi Permesinan 17
Parameter Pemesinan Milling
• Nt = number of teeth
fT
fnf
r
m
r
tr
AL
dDdA
wdMRR
fN
D
vN
)(
Operasi Permesinan 18
Mesin Milling (1)
(a) horizontal (b) vertical
Operasi Permesinan 19
Mesin Milling (2)
(a) universal-overarm (b) ram type
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
Operasi Permesinan 21
Turning Centers
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
Operasi Permesinan 23
Operasi Milling Lainnya
(a) shaping (b) planning
Operasi Permesinan 24
Bentuk-bentuk Shaping & Planing
Operasi Permesinan 25
Mesin Shaper
Operasi Permesinan 26
Mesin Planer
Operasi Permesinan 27
Operasi Milling Lainnya
Broaching
(a) external broaching (b) internal broaching
Operasi Permesinan 28
Sawing
(a) power hacksaw (b) bandsaw (c) circular saw
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