Microsoft Word - Bahan Ajar Teknologi Mekanik II

BAHAN AJARMATA KULIAH TEKNOLOGI MEKANIK II DTM 2101(2 SKS)

Disusun Oleh :I. Aris Hendaryanto, S.T.Ir. Greg. SukartonoPROGRAM STUDI TEKNIK MESIN SEKOLAH VOKASI UNIVERSITAS GADJAH MADA2012DAFTAR ISIDAFTAR ISI 2BAB IPENDAHULUAN3

BAB IIPROSES NON KONVENSIONAL YANG TERMASUK

KELOMPOK PROSES MEKANIS (MECHANICAL PROCESS)17

BAB IIIPROSES NON KONVENSIONAL YANG TERMASUK

KELOMPOK PROSES KIMIA35

BAB IVELECTRICAL DISCHARGE MACHINING52

BAB VPROSES PEMBENTUKAN PRODUK PLASTIK

(PLASTIC MOLDING & FORMING)84

BAB I PENDAHULUAN

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Gambar 1.2. Klasifikasi Proses Non Konvensional6

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16BAB IIPROSES NON KONVENSIONAL YANG TERMASUK KELOMPOK PROSES MEKANIS (MECHANICAL PROCESS)

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34BAB IIIPROSES NON KONVENSIONAL YANG TERMASUK KELOMPOK PROSES KIMIA III.1 CHEMICAL MACHINING (CHM)35

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41III.2 ELECTRO CHEMICAL PROCESSES

III.2.1 ELECTRO CHEMICAL MACHINING (ECM)

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III.2.2 ELECTRO CHEMICAL GRINDING (ECG)1. PENDAHULUAN

492. PRINSIP DASAR ECG

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4.3 RANGKAIAN LISTRIK DASAR DARI EDM DAN PRINSIP KERJANYA

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83BAB VPROSES PEMBENTUKAN PRODUK PLASTIK (PLASTIC MOLDING & FORMING)1. Material TermoplastikMaterial termoplastik yang digunakan untuk membuat produk plastik, diproduksi dalam bentuk butiran. Bermacam jenis material thermoplast, sifat-sifatnya serta aplikasinya dapat dilihat pada tabel 5.1.Gambar 5.1. Material TermoplastikTabel 5.1. Thermoplastic Materials.MaterialAbbr.PropertiesTypical Applications

PolypropylenePPGood chemical resistancePackaging, containers

PP HomopolymerHPPPSemi rigid, durableSmall domestic appliances eg kettles

PP CopolymerCPPPGood gloss, texture possible, low costLarge automotive parts, plates and cups for children and picnics

84PolyethylenePEGood chemical resistance, flexible or semi rigid depending on grade. Weatherproof, good low temperature performance. Non toxic. Low costLow Density Packaging, containers. High Density crates, chemical drums, gas/water pipe and fittings, kitchenware

PE Low DensityLDPE/LLDPE

PE High DensityHDPE

PolystyrenePSBrittle, transparent. Poor UV stability. HIPS up to 7x impact strength of GPPSGPPS toys, packaging, cosmetic packagingHIPS TV cabinets, refrigerator linings, toilet seats

General PurposeGPPS

High ImpactHIPS

AcrylicPMMARigid, clear, glossy, good weather resistanceLenses, signs, light diffusers, point of purchase displays

Acrylonitrile Butadiene StyreneABSRigid, opaque, tough, good gloss, texture possibleDomestic appliances, car fascias, computer housings

Nylon(Polyamide)PARigid, tough, hardwearingGears, bearings, automotive under bonnet parts

AcetalPOMRigid, tough, springlike, good wear and electrical propertiesAerosol valves, clock parts, computer printer components

PolycarbonatePCRigid, transparent, excellent impact resistance, good weather resistance, good dimensional stabilityCrash helmet visors, vandal proof glazing, riot shields, car headlamp lenses, safety helmets, babies bottles

Acrylate StyreneAcrylonitrileASARigid, opaque, tough, good UVresistanceHousings, telephones, automotive door mirrors and radiator grilles

StyreneAcrylonitrileSANRigid, transparent, tough, resistant to stress crackingLenses, drinking tumblers, kitchen and picnic ware, hi-fi covers

PolyvinylChloridePVCRigid or flexible grades, weatherprooof, non-flammable, good impact strength and electrical insulationDrainpipes and guttering, cable insulation, flooring, roofing, hosepipes

PolyurethanePURFlexible, clear, impermeableShoe soles and heels, seals, gaskets, rollers, wheels

PolyestersPBT, PETRigid, clear, extremely tough, wide temperature range resistanceDrink bottles, business machine components, transformer parts

PolysulphonePES,PSU,PEEKExcellent high temperature stability, rigid or flexible grades available. High costMicrowave grills, chemotherapy devices, surgical equipment, fuel cells

PolyphenyleneSulphidePPSRigid, opaque, non-burning, good chemical resistance at high temperatureChemical pumps, medical and dental equipment, transformer parts, heating element bases

PolyvinylideneFluoridePVDFStrong, tough material with excellent chemical and heat resistanceValves, pumps, bearings in chemical process industry

85PolyphenyleneOxidePPORigid, opaque, glossy, excellent dimensional stabilityTV housings, automotive instrument enclosures

Ethylene VinylAcetateEVAFlexible (rubber-like), good low temperature flexibility, good chemical resistanceHandle grips, ice cube trays, hoses

2. Mesin Injeksi Plastik

Gambar 5.2. Mesin Injeksi Plastik3. Jenis Cetakan Plastik (Plastic Molding)8687DAFTAR PUSTAKA- Yuwono, Sigit & Bagiasna, Komang; Proses Non Konvensional; ITB; Bandung.- Sommer, Carl & Sommer, Steve; Complete EDM Handbook, www.reliableedm.com- Pye, R.G.W; Injection Mould Design; Longman Scientific & Technical; New York; 1989.- Jiann Sheng; EDM Operation Manual; Jiann Sheng Machinery & Electric Industrial Co., Ltd. Taiwan; 2000.88

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