TI-2121: Proses Manufaktur · Mesin Shaper TI2121 - Proses Manufaktur ... Mesin Planer. 17 TI2121 - Proses Manufaktur - 10 33 Departemen Teknik Industri FTI-ITB Operasi Milling Lainnya

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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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TI2121 - Proses Manufaktur - 10 2


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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Istilah



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



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



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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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



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



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



Boring Mill (2)

Vertical boring mill

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Boring Mill (3)

Boring bar made of cemented carbide



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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Operasi Drillling Lainnya

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



Mesin Drilling

Drill press & Radial drill press

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Milling

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



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



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

ALdDdA

wdMRR

fNDvN

+=

−=

=

=

=

)(

π



Mesin Milling (1)

(a) horizontal (b) vertical

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Mesin Milling (2)

(a) universal-overarm (b) ram type



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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Turning Centers



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



Bentuk-bentuk Shaping & Planing

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Mesin Shaper



Mesin Planer

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Operasi Milling Lainnya

• Broaching

(a) external broaching (b) internal broaching



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



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

TI-2121: Proses Manufaktur · Mesin Shaper TI2121 - Proses Manufaktur ... Mesin Planer. 17 TI2121 - Proses Manufaktur - 10 33 Departemen Teknik Industri FTI-ITB Operasi Milling Lainnya

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