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All Journal ROTOR: JURNAL ILMIAH TEKNIK MESIN
Hari Arbiantara, Hari
Staf Pengajar Jurusan Teknik Mesin Fakultas Teknik Universitas Jember
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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OPTIMASI DESAIN MOLD UNTUK MEREDUKSI CACAT FLASH DAN SHRINKAGE PADA PRODUK PAKU KOTAK DENGAN MENGGUNAKAN SOFTWARE SIMULASI MOLDFLOW (STUDI KASUS PADA PT. PRIMA SAKTI) Ayu W., Erfina; Arbiantara, Hari
ROTOR Vol 8, No 1 (2015)
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Abstract

Use of plastic is rapidly increasing, but in injection molding products common product defects, such cracks, shrinkage, unperfect shape, overtopping plastic material, dimensions of product outside specified tolerance and  forth are caused by several factors. The most important factors are mold design. PT. Prima Sakti is injection molding company that produced products rectangle nail that has defects, especially flash and shrinkage, which would harm company. In this study, the authors make analysis to reduce defects in trectangle nail by polypropylene using moldflow simulation software, by varying placement of  gate and diameter of  cooling in mold. The aims are obtaining parameter settings of cylinder temperature, injection pressure, eficient and optimum cooling for rectangle nail, and also obtaining mold that produce  smallest percentage of defect. The test is conducted by varying temperature cylinder 230˚C, 240˚C, 241,1˚C, and 250˚C, and varying injection pressure of 60 MPa, 69.134 MPa, 98.56 MPa and 128 MPa, which aims to determine ratio of shrinkage and fill time. Result that obtained in this study that for rectangle nail product, the best output obtained in design 2 simulation with cylinder temperature 230˚C, injection pressure 60 Mpa and 98,56 Mpa, that obtain shrinkage ratio 15,68% with fill time 0,38 second.
Analisis Kekuatan Tarik dan Kekasaran Kawat Tembaga Hasil Drawing akibat Variasi Persentase Reduksi Firman, Mohammad; Darsin, Mahros; Arbiantara, Hari
ROTOR Vol 6, No 1 (2013)
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Wire drawing is cold working process to reduce the cross-sectional area. The value of reduction is different in every process, depend on the needs and working parameters. The degree of reduction causes differences of copper wire rod in the characteristics and quality, such as its tensile strength and roughness. The purpose of this research is to determine the influence degree of reduction to the tensile strength and roughness of copper wire. The research method is comparing the tensile strength and roughness of copper wires control with drawed copper wires, without repetition stage. The speciments used in this research are pure copper rods (99.9%) with 3.1 mm, 3.2 mm and 3.25 mm in diameter and 2.8 mm of die output, so will get the degree of reductions are 19%, 23% and 26%. The results of this research was the wire drawing process increase the tensile strength of copper rods from 86.87 MPa to 100.74 MPa on 19% reduction. On 23% reduction the tensile strength increase from 82.24 MPa to 105.62 MPa. The greatest increase of tensile strength was result by 26% reduction, it was from 86.87 MPa to 115.36 MPa With the more of degree of reduction on the drawing process led the increase of tensile strength will be greater. This research also obtained the result that the wire drawing process result the decrease roughness of copper rods from 0,144 μm to 0,089 μm on 19% reduction, from 0.146 μm to 0.087 μm on 23% reduction and the copper rod roughness decrease from 0.159 μm to 0.083 μm on 26% reduction. The increase of degree of reduction produce insignificantly result of surface roughness changing. Keywords: Roughness, Tensile Strength, Wire Drawing, Reduction, Copper
PENGARUH PROSES PENGADUKAN TERHADAP KARAKTER ADONAN DAN SIFAT BIODEGRADABLE PLASTIC YANG DIBUAT DARI BUNGKIL BIJI JARAK PAGAR Arbiantara, Hari; Darsin, Mahros; Lindriati, Triana
ROTOR Vol 6, No 1 (2013)
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Abstract

Manufacture of biodegradable plastics in this study begins with making the dough using a single screw extruder, then the dough is molded by using a compression molding machine. The basic material used is a mixture of jatropha seed meal, corn starch, CMC (composition 7: 2: 1). This study aimed to study the effect of Helic corner and screw compression ratio of the batter character and biodegradable plastic produced. Helic screw angle was varied from 2,5o; 5o; 7.5 ° and screw compression ratio varied from 1.5; 2.5; 3.5. The results showed an increase in the angle of screw Helic simplify the process of molding (lowering the value of Tg, Tm, ΔH and texture of the dough) and to improve the mechanical physical properties of the biodegradable plastic produced (tensile strength, strain increases while the thickness and Water Vapor transmition rate decreases). Improved compression ratio increase and decrease the thermal properties of dough texture and increase the tensile strength and strain, decrease the thickness and Water Vapor transmition rate of biodegradable plastic produced. Keyword: biodegradable plastic, mold, helical degree, compression ratio
Analisis Kekuatan Tarik dan Tekan Cetakan Pasir akibat Variasi Ukuran Butir dan Kadar Pengikat Pasir Cetak Devianty, Sella; Syuhri, Ahmad; Arbiantara, Hari
ROTOR Vol 7, No 2 (2014)
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Abstract

Molding sand is one the most important thing in sand casting. The weak tensile strength and compressive strength of molding sand causes some defects, such as sand drop and sand inclusion. Therefore this research is done by varying grain size and percentage of binder in molding sand. The purpose of this research was to analyze the tensile strength and the compressive strength of sand mold due to variation of grain size and binder presentation. Each treatment will through tensile strength test and compressive strength test, then the data from the test will be analyzed by using ANOVAfor factorial experiments with SPSS 16.0 and a significance level of 5%. From the research and analysis conducted found that the tensile strength of the molding sand is influenced by the grain size and binder presentation, meanwhile the compressive strength is influenced by the binder presentation but is not affected by the grain size. The highest average value of the sand mold tensile strength is 0.912 N/mm2 and the highest average value of the sand mold compressive strength is 2.7567 N/mm2. Those values are achieved by the use of a mixture of GFN 40-50 AFS silica with a percentage binder as much as 1.5%. Keywords: Molding sand, grain size, binder
PENGARUH SUHU DAN WAKTU TERHADAP KEKUATAN TARIK DENGAN PENGUJIAN TERMAL MEKANIS PADA BELT CONVEYOR 2 PLY Muhammad, Muslih; Arbiantara, Hari; Adib Rosyadi, Ahmad
ROTOR Vol 8, No 2 (2015)
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Abstract

Belt is a major component that directly contact with the material and also it is a component that can be worn out in a conveyor system. Along with its production capacity and lack of conveyor belt proper maintenance, a conveyor belt will experience a variety of obstacles or problems. The problem that often occurs is the torning belt. To overcome the problems, belt splicing is necessary to do. Hot splicing method is one method that can help connecting the belt. Hot splicing method utilizing heat, time and pressure to connect the belt. The purpose of this study is to determine the influence of temperature and timing of belt splicing against tensile strength with thermal mechanical testing. The method used in this study is the experimental method, a method used to test the effect of a treatment on the object under study. Experiments carried out at a temperature variation of grafting ( 130 ºC, 145 ºC and 160 ºC) and the variation of the connection time for 20 minutes , 30 minutes and 40 minutes . The results Showed the highest strength values of 5:14 MPa at a temperature of 130 ºC splicing and connecting time of 40 minutes. Keywords: Belt Conveyor, Splicing Temperature and Splicing Time.
Pengaruh Tekanan Udara (Inflation Pressure) pada Ban Tipe Radial Ply terhadap Rolling Resistance Kristianta, F.X.; Arbiantara, Hari
ROTOR Vol 8, No 2 (2015)
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Abstract

Salah satu faktor yang berperan penting pada efisiensi bahan bakar pada kendaraan adalah rolling resistance. Rolling Resistance adalah tahanan terhadap roda yang akan dan telah menggelinding akibat adanya gaya gesekan antara roda dengan permukaan jalannya roda. Ban radial umumnya mempunyai aspek ratio yaitu perbandingan tinggi dan lebar lebih kecil dari ban bias.Ban radial adalah ban yang paling banyak dipakai pada kendaraan penumpang untuk saat ini. Pada penelitian ini akan melakukan analisa tentang pengaruh tekanan udara pada ban tipe radial ply terhadap rolling resistance. Pada penelitian ini digunakan alat standar pengukuran rolling resistance yang ditetapkan oleh International Organization for Standardization (ISO), yaitu ISO 18164: 2005. Tujuan penelitian ini mengetahui pengaruh tekanan udara (inflation preassure) terhadap rolling resistance pada ban tipe radial ply pada kecepatan 36,7 km/jam. Penelitian ini tekanan udara yang diberikan bervariasi mulai dari 100 kPa, 150 kPa, 200 kPa, 250 kPa, dan 300 kPa dengan pembebanan radial 1kN. Nilai rolling resistance diukur menggunakan alat uji rolling resistance dan untuk mengetahui kecepatan putar menggunakan tachometer. Nilai rata – rata rolling resistance dan lebar tapak terkecil terdapat pada tekanan udara 300 kPa dengan nilai 9,36 N dan 39 mm. Nilai rata – rata rolling resistance dan lebar tapak terbesar terdapat pada tekanan 100 kPa dengan nilai 19,97 N dan 51,5 mm. Tekanan udara (inflation preassure) dapat meningkatkan dan menurunkan nilai rolling resistance, dikarenakan luasan kontak ban terhadap permukaan jalan yang berubah seiring dengan perubahan tekanan udara (inflation preassure) yang diberikan . Keywords: Tekanan udara, rolling resistance, ban radial ply
Co-Authors Ahmad Adib Rosyadi Ahmad Syuhri Erfina Ayu W., Erfina F.X. Kristianta, F.X. Mahros Darsin Mohammad Firman, Mohammad Muslih Muhammad, Muslih Sella Devianty, Sella Triana Lindriati