4 Pasak Kopling Dan Seal
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ELEMEN MESIN I
TKM4113Kamis 07.30 – 10.00
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PASAK, KOPLING DAN SEAL
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PASAK, KOPLING DAN SEAL
Menjelaskan macam-macam pasak
Menentukan pasak yang cocok digunakan pada
poros.
Menetukan material yang cocok untuk pasak
Merencanakan pasak
Menjelasakan tentang poros berbintang
Menjelaskan tentang kopling tetap dan kopling
fleksibel
Menjelaskan macam-macam kopling fleksibel
Menjelaskan tentang universal joint
Menentukan seal yang cocok untuk poros
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PASAK
Macam-macam pasak
Pasak paralel
Pasak tirus
Pasak jarum
Pasak woodruff
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PASAK PARALEL
Persegi dan persegi panjang
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PASAK PARALEL
ANSI (American National Standards Institute)
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PASAK PARALEL
Geometri
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PASAK PARALEL
Radius fillet dan Chamfer
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PASAK TIRUS
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PASAK JARUM DAN WOODRUFF
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MATERIAL PASAK
Baja karbon rendah (umum digunakan)
AISI 1020 CD
Tegangan ultimate = 61 ksi (420 MPa)
Tegangan yield = 51 ksi (352 MPa)
Elongation = 15%
Baja karbon tinggi
AISI 1040
AISI 1045
Material pasak HARUS ulet dengan elongation > 10%
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ANALISA TEGANGAN PANJANG PASAK
PARALEL
Gaya geser
Gaya tekan
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ANALISA TEGANGAN PANJANG PASAK
Gaya geser
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ANALISA TEGANGAN PANJANG PASAK
Gaya tekan
(Industri)
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CONTOH PERENCANAAN PASAK
Dari standard pasak
Geometri pasak ½ in2 (diameter poros = 2 in)
Material baja AISI 1040 CD dengan tegangan yield =
51000 psi (lebih rendah dari material poros dan
bantalan)
L ≈ 1.50 in
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CONTOH PERENCANAAN PASAK
Ringkasan
Baja AISI 1040 CD
Lebar = 0.500 in
Tinggi = 0.500 in
Panjang = 1.50 in
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SPLINE (POROS BERBINTANG)
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SPLINE (POROS BERBINTANG)
Diameter
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KOPLING
Kopling tetap
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KOPLING
Kopling fleksibel
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KOPLING
Kopling fleksibel
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UNIVERSAL JOINT
Mentransmisikan daya pada 2 poros yang tidak
sesumbu (> 3o)
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ALAT TAMBAHAN PADA POROS (AKSIAL)
Retaining rings
Collars
Spacers
Locknuts
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RETAINING RINGS
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COLLARS
Spacers Collars
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LOCKNUTS
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SEALS
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MATERIAL SEALS
Elastomers Weather resistance: Silicone, fluorosilicone. fluorocarbon.
ethylene propylene, polyurethane, polysulfide, polyester, neoprene, epichlorohydrin, and PNF.
Petroleum fluid resistance: Polyacrylate, polyester, PNF. nitrile. Polysulfide. polyurethane, fluorocarbon, and epichlorohydrin.
Acid resistance: Fluorocarbon.
High-temperature operation: Ethylene propylene, fluorocarbon, polyacrylate. silicone, and PNF.
Cold-temperature operation: Silicone, fluorosilicone. ethylene propylene, and PNF.
Tensile strength: Butadiene, polyester, and polyurethane.
Abrasion resistance: Butadiene, polyester, and polyurethane.
Impermeability: Butyl, polyacrylate, polysulfide, and polyurethane.
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MATERIAL SEALS
Rigid material
Metals: Carbon steel, stainless steel, cast iron, nickel
alloys, bronze, and tool steels.
Plastics: Nylon, filled polytetrafluoroethylene
(PTre), and polyimide.
Carbon, ceramics, tungsten-carbide.
Plating: Chromium, cadmium, tin, nickel, and silver.
Flame-sprayed compounds.
Gasket