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INDONESIA
Jurnal Nosel
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Education, Engineering,
Education Mechanical Engineering
Arjuna Subject : -
Articles 14 Documents
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Search results for , issue "Vol 1, No 2 (2012): October" : 14 Documents clear
STUDI PENAMBAHAN BENTONIT PADA PASIR CETAK BASAH TERHADAP PERMEABILITAS DAN KEKUATAN TEKAN Tegar K, Gemilang
Jurnal Nosel Vol 1, No 2 (2012): October
Publisher : Jurnal Nosel

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Abstract

Tujuan penelitian ini adalah membuktikan bahwa variasi penambahan bentonit sebesar 0 gr, 30 gr, 50 gr dan 70 gr, pada pasir cetak basah dapat menyebabkan perbedaan kemampuan alir gas (permeabilitas) dan kekuatan tekan dengan menggunakan bahan campuran pasir (80% pasir kali dan 20% pasir silika). Penelitian ini juga untuk mengetahui variasi penambahan bentonit pada masing-masing sampel penelitian yang menyebabkan permeabilitas dan kekuatan tekan dapat optimal. Sampel pada penelitian ini menggunakan SNI 15-0312-1989 yang mempunyai diameter 50 mm dan tinggi 50 mm. Data diperoleh dengan cara mengukur besarnya nilai permeabilitas dengan alat Permeability Tester, sedangkan nilai kekuatan tekan diukur dengan Universal Strength Machine. Faktor lain yang kemungkinan mempengaruhi hasil pengukuran dikontrol atau dikendalikan. Metode penelitian ini menggunakan metode eksperimen. Hasil penelitian menunjukan bahwa ada perbedaan antara variasi penambahan bentonit pada pasir cetak basah terhadap kemampuan alir gas (permeabilitas) dan kekuatan tekan. Campuran bentonit pada pasir cetak yang paling optimal digunakan untuk cetakan pengecoran besi cor kelabu pada masing-masing sampel penelitian adalah pada campuran penambahan bentonit 50 gr menghasilkan permeabilitas 104,67 cm3/menit dan kekuatan tekan 61,87 KN/m2
OPTIMASI PARAMETER PROSES PEMESINAN CNC MILLING TERHADAP KEKASARAN PERMUKAAN KAYU JATI DENGAN METODE TAGUCHI Firstiawan, Nur
Jurnal Nosel Vol 1, No 2 (2012): October
Publisher : Jurnal Nosel

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Abstract

Tujuan penelitian ini adalah untuk mengetahui: (1) Pengaruh variasi kecepatan spindle, laju pemakanan, kedalaman pemakanan, dan arah potong serat kayu (longitudinal, radial, dan tangensial) terhadap tingkat kekasaran permukaan hasil proses pemesinan CNC milling type ZK 7040 pada material kayu jati. (2) Mengetahui parameter manakah yang menghasilkan nilai kekasaran optimal pada proses pemesinan CNC milling type ZK 7040 pada material kayu jati, dengan menggunakan metode Taguchi. Proses pemesinan kayu jati menggunakan mesin CNC milling type ZK 7040 dengan control SIEMENS SINUMERIK 802S dilaksanakan di SMK SAKTI Gemolong. Pengujian kadar air dilakukan di Laboratorium Bahan, Teknik Sipil, Universitas Sebelas Maret. Pengujian kekasaran permukaan dilaksanakan di Laboratorium Bahan Teknik, Program Diploma Teknik Mesin, Sekolah Vokasi, Universitas Gadjah Mada. Metode optimasi yang digunakan dalam penelitian ini adalah metode Taguchi. ANAVA TAGUCHI (Analisis Varian Taguchi) dibantu software Minitab 15 untuk mengetahui karakteristik performansi dari parameter pemesinan. Hasil penelitian proses pemesinan CNC milling type ZK 7040 pada material kayu jati ini adalah: (1) Semakin tinggi kecepatan spindle, akan menghasilkan nilai kekasaran permukaan yang semakin kecil yaitu pada level 3 = 3000 rpm; semakin tinggi laju pemakanan, akan menghasilkan nilai kekasaran permukaan yang semakin besar yaitu pada level 3 = 1200 mm/min; semakin tinggi kedalaman pemakanan, akan menghasilkan nilai kekasaran permukaan yang semakin besar yaitu pada level 3 = 6 mm; dan semakin kering kayu pada variasi arah potong serat kayu, akan menghasilkan nilai kekasaran permukaan yang semakin kecil yaitu pada level 1 = arah pemotongan tangensial. (2) Parameter yang menghasilkan nilai kekasaran permukaan optimal adalah pada kecepatan putaran spindle 3000 rpm, laju pemakanan sebesar 400 mm/min, kedalaman pemakanan 2 mm, dan arah potong serat kayu tangensial. Laju pemakanan memiliki pengaruh paling besar dengan delta S/N rasio sebesar 3,78 dan arah potong serat kayu memiliki kontribusi paling kecil yaitu dengan delta S/N rasio sebesar 1,92. (3) Hasil kekasaran yang optimal adalah 4,12 ± 0,42 ?m.  
KARAKTERISASI TINGKAT KEKASARAN PERMUKAAN BAJA ST 40 HASIL PEMESINAN CNC MILLING ZK 7040 EFEK DARI KECEPATAN PEMAKANAN (FEED RATE) DAN AWAL WAKTU PEMBERIAN PENDINGIN Purbosari, Dhiah
Jurnal Nosel Vol 1, No 2 (2012): October
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Abstract

The purpose of this research was to determine the level surface roughness characterization of steel ST 40 results ZK 7040 CNC Milling machining effect feed rate and the early timing of cooling. This research was conducted at SMK WARGA Surakarta Laboratory. Machining process using ZK 7040 CNC Milling machines with control SIEMENS SINUMERIK 802S. Data obtained by measuring the level of roughness of the workpiece using a SURFCODER SE-1700 at Bahan Teknik D3, Univesitas Gadjah Mada Laboratory. This research method using descriptive analysis with independent variable were feed rates and the early timing of cooling, dependent variable  was levels of surface roughness of steel ST 40. The results on the feedrate 0.11 mm / rev, 0.13 mm / rev and 0.15 mm / rev indicates that the higher the feedrate is used to produce the level of the rough workpiece roughness. In the early timing of the air 10 minutes, 15 minutes and, 20 minutes showed that the longer the first timing of cooling used in the CNC machining process Milling ZK 7040 on steel ST 40, would result in the level of the rough workpiece roughness. This research resulted in varying levels of surface roughness between N6 to N8. The level of roughness of the workpiece machining CNC Milling results ZK 7040 on steel ST 40 that the smallest on the conditions before the beginning of the cooling at feed rate 0.11 mm / rev and the early cooling time 10 minutes is equal to 1.616 ?m, while the greatest rudeness occurs the feed rate of 0.15 mm / rev and the early timing of the air 20 minutes is equal to 3.603 ?m. The level of roughness of the workpiece machining CNC Milling results ZK 7040 on steel ST 40 that the smallest on the conditions after the timing of cooling on CNC milling machining process ZK 7040 occurred at a feed rate of 0.11 mm / rev and the early timing of cooling after 10 minutes is equal to 1.855 ?m while the roughness of the greatest place on the feed rate of 0.15 mm / rev and the early timing of cooling after 20 minutes is equal to 5.782 ?m.
PENGARUH VARIASI TEMPERATUR DAN HOLDING TIME DENGAN MEDIA QUENCHING OLI MESRAN SAE 40 TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA ASSAB 760 Bangsawan, Ihsan Gata
Jurnal Nosel Vol 1, No 2 (2012): October
Publisher : Jurnal Nosel

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Abstract

The purpose of this study was (1) Determine the influence of temperature variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (2) Knowing the effect of holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760, (3) Knowing the interaction of temperature variation and holding time variation with quenching media Mesran SAE 40 oil to microstructure and hardness of carbon steel ASSAB 760. This research uses experimental methods. Objects in this study is ASSAB 760 medium carbon steel, the product of the Associated Swedish Steels AB (Assab Steels) Stockholm, Sweden, with the chemical content of 0.50% C, 0.60% Mn, 0.30% Si and 0.04 S %. Data analysis techniques in this study using descriptive data analysis results graphically illustrate the tables, histograms, graphics, and images of microstructures. As an input parameter in analyzing the data include: temperature variation (800 °C, 840 °C, and 880 °C), holding time variation(15 minutes, 25 minutes, and 35 minutes), microstructure, and hardness. The results showed a change in the level of hardness and the microstructure formed. From the hardness test results obtained the highest level of hardness in the specimen temperature 800 °C with holding time of 35 minutes 27.66 HRC consecutive lows towards the specimen temperature of 840 °C with holding time 35 min and temperature of specimens 880 °C with holding time of 35 minutes 24.33 HRC, 840 °C specimen temperature and holding time 25 minutes at 24 HRC, the specimen temperature of 880 °C with holding time of 25 minutes 23.33 HRC, specimen temperature of 840 °C with holding time of 15 minutes 22.33 HRC, the specimen temperature 800 °C with holding time 25 minutes at 22 HRC, the specimen temperature of 880 °C with holding time of 15 minutes 21.33 HRC, specimen temperature of 800 °C with holding time of 15 minutes 19.33 HRC, and the lowest rate is specimens of raw material 8 HRC . Microstructure test shows microstructure of raw materials consists of ferrite and pearlite with impartial large crystals form and in accordance with the carbon content of 0.50 % and in the group of the hardening specimens with quenching media Mesran SAE 40 oil, new microstructure is obtained martensite is the main structure in increasing steel hardness . From the research it can be concluded that the variation of temperature and holding time variation with quenching media Mesran SAE 40 oil can change the microstructure and increases hardness of steel ASSAB 760 with the highest hardness value of the specimen temperature of 800 °C with holding time of 35 minutes 27.66 HRC.

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