week 10 per me sinan

Operasi Pemesinan & Mesin Perkakas

TI2121 - Proses Manufaktur - 10 2

Klasifikasi Komponen Pemesinan

(a) rotational (b) non-rotational (prismatic)

TI2121 - Proses Manufaktur - 10 3

Bentuk Permukaan Potong

(a) straight turning (b) taper turning (c) contour turning (d) plain milling (e) profile milling

TI2121 - Proses Manufaktur - 10 4

Forming: Bentuk Pemotongan

(a) form turning (b) drilling (c) broaching

TI2121 - Proses Manufaktur - 10 5

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

TI2121 - Proses Manufaktur - 10 7

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

TI2121 - Proses Manufaktur - 10 8

Mesin Lathe

TI2121 - Proses Manufaktur - 10 9

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

TI2121 - Proses Manufaktur - 10 10

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

TI2121 - Proses Manufaktur - 10 11

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

TI2121 - Proses Manufaktur - 10 12

Boring Mill (2)

Vertical boring mill

TI2121 - Proses Manufaktur - 10 13

Boring Mill (3)

Boring bar made of cemented carbide

TI2121 - Proses Manufaktur - 10 14

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

TI2121 - Proses Manufaktur - 10 15

Operasi Drillling Lainnya

(a) reaming (b) tapping (c) counter boring (d) countersinking (e) center drilling (f) spot facing

TI2121 - Proses Manufaktur - 10 16

Mesin Drilling

Drill press & Radial drill press

TI2121 - Proses Manufaktur - 10 17

Milling

Types of milling operation: (a) peripheral or plain milling (b) face milling

TI2121 - Proses Manufaktur - 10 18

Peripheral Milling

(a) slab milling (b) slotting (c) side milling (d) straddle milling

TI2121 - Proses Manufaktur - 10 19

Tipe Pemotongan Milling

(a) up milling (b) down milling

TI2121 - Proses Manufaktur - 10 20

Face Milling

(a) conventional face milling

(b) partial face milling

(c) end milling (d) profile milling (e) pocket milling (f) surface

contouring

TI2121 - Proses Manufaktur - 10 21

Parameter Pemesinan Milling

• Nt = number of teeth

fT

fnf

r

m

r

tr

AL

dDdA

wdMRR

fN

D

vN

)(

TI2121 - Proses Manufaktur - 10 22

Mesin Milling (1)

(a) horizontal (b) vertical

TI2121 - Proses Manufaktur - 10 23

Mesin Milling (2)

(a) universal-overarm (b) ram type

TI2121 - Proses Manufaktur - 10 24

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

TI2121 - Proses Manufaktur - 10 26

Operasi pada Mill-Turn Centers

(1) turn second diameter (2) mill flat with part in programmed angular position (3) drill hole (4) cutoff

TI2121 - Proses Manufaktur - 10 27

Operasi Milling Lainnya

(a) shaping (b) planning

TI2121 - Proses Manufaktur - 10 28

Bentuk-bentuk Shaping & Planing

TI2121 - Proses Manufaktur - 10 29

Mesin Shaper

TI2121 - Proses Manufaktur - 10 30

Mesin Planer

TI2121 - Proses Manufaktur - 10 31

Operasi Milling Lainnya

• Broaching

(a) external broaching (b) internal broaching

TI2121 - Proses Manufaktur - 10 32

Sawing

(a) power hacksaw (b) bandsaw (c) circular saw

TI2121 - Proses Manufaktur - 10 33

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

TI2121 - Proses Manufaktur - 10 34

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