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Rekayasa Mesin

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Published by Universitas Brawijaya

ISSN : 23381663 EISSN : 24776041 DOI : 10.21776/ub.jrm

Core Subject : Engineering,

Mechanical Engineering

Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.

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Articles 965 Documents

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Tensile Strength and Macro-microstructures of A6061 CDFW Weld Joint Influenced by Pressure and Holding Time in the Upset Stage Abdulla, Farg Abdulla M; Irawan, Yudy Surya; Darmadi, Djarot Bangun
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This paper aims to analyze the effect of pressure and holding time in the upset stage on tensile strength and macro-microstructures of continuous drive friction welded (CDFW) joints of aluminum alloys A6061. Friction weld specimens were welded using variations of upset pressure (40, 80, 120 MPa). The upset holding time was varied from 3, 10, to 20 seconds. Tensile strength test was conducted based on the AWS standard. The result showed that the higher upset pressure and the longer holding time in the upset stage are able to reduce the porosity of the CDFW weld joint and cause a higher tensile strength of the specimens. Meanwhile, from macro-mic restructures observation results, it was found that the specimen with maximum tensile strength has a wider partly deformed area (ZPD) and finer grains in the center of the specimen longitudinal section compared to those of the specimens with minimum tensile strength. It was occurred due to plastic deformation as the result of the higher pressure and the longer holding time in the upset stage. Fracture surface observation results indicate that in the specimen with a higher upset pressure and a longer holding time, has inflated fracture surface and the fracture zone exists in the heat affected zone, not in the interface like that of the specimen with lower tensile strength due to the lower upset pressure and the shorter holding time.

Unjuk Kerja Reflektor Radiasi Panas dengan 1 Baris Sirip terhadap Efisiensi Kompor LPG Sudarno, Sudarno; Soeparman, Sudjito; Wahyudi, Slamet; Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

It has been known from the previous researchers that the use of the heat radiation reflector can improve the efficiency of the LPG stoves. Based on the radiation theory, the radiation energy is emitted radially in all directions. Therefore, a kind of method to guide the heat radiation is required to minimize the heat losses. One of the method is to add some fins to the reflector in order to capture the potential heat loss from the non-finned reflector. In this work, we use one fin line reflector made from a plate of stainless steel in the shape of cutted-cone. The boiling water test is used to investigate the efficiency of LPG stoves. We find that the efficiency of LPG stoves can be increased by adding one fin line reflector by about 5.21% and 1.75% than that one without reflector and non-finned reflector, respectively. The result of the temperature distribution shows that one fin line reflector enlarges the area of complete combustion.

Desain Manufaktur Bracket Aluminium Raharjo, Rudianto; Widodo, Teguh Dwi; Bintarto, Redi
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Machining is one of the processes in a manufacturing of a product. Manufacturing design is needed for improving the quality of a product. The desired manufacturing process is the achievement of a product with a smooth level of roughness and a short time. Bracket is one component of a series of machines. Work on bracket using CNC milling and Turning machine. The material used is aluminum alloy 6063. The main variables in this machining process are the speed of feeding, cutting speed and feeding motion. The results achieved in the machining process of this bracket are for the roughness on the surface of the N5 with Ra (ideal) = 0.4 Î¼m of Ra (actual) = 0.410 Î¼m. As for the roughness of N6 with Ra (ideal) = 0,8 Î¼m obtained result Ra (actual) = 0,832 Î¼m and 0,625 Î¼m. Total machining time for one workpiece are 1 hour 57 minutes 25 seconds.

Analisis Pengaruh Bahan Bakar Alternatif pada Lemari Pengasap Ikan terhadap Kualitas Produk Hasil Asapan Nugroho, Setyawan Dwi; Soeparman, Sudjito; Yuliati, Lilis
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

This study was conducted to determine the effect of the amount of fuel in the combustion chamber on the fish smoking kiln to temperature and temperature distribution in the smoke room as well as the quality of the smoked fish.This study used 3 types of fuel those are dry coconut shell, coconut fiber and sugarcane pulp briquette. Temperature needed in the smoke room for 3 hours is 80° C, andthe fish smoked ismilkfish. The result showed that to achieve the same smoking temperature, it required the amount of dry coconut shell as much as 1045 grams, while the coconut fiber as much as 1730 grams and sugarcane pulp briquette as much as 2055 grams. The temperature of each fishing point is relatively even with a maximum temperature difference of 1.38%, while the difference between the setting temperature and the temperature at the maximum fish points is 8.88%. It can be concluded that the heat value, particle density rate and combustion rate (heat release) of fuel affect the amount and distribution of fuel to the temperature change in the fish smoking room in the fish smoking kiln. The quality of smoked fish products with 3 types of fuels meets SNI 2725.1.2009.

Analisis Pengaruh Holding Time terhadap Sifat Mekanis dan Struktur Mikro pada Proses Induction Tempering Batang Piston Baja SCM 420 H Budiarto, Budiarto; Turnip, Kimar
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Selection of materials connecting rod for a component or structure usually involves several aspects, there are aspects of specific strength, stiffness, lightweight, noncorrosive materials and resistance or age. In the manufacturing process connecting rod always give heat treatment such as Normalizing, Carburizing, and Induction Tempering. In the process, Induction Tempering has a big problem in hardness after the process, not stable and liable to over from standard. Process condition of tempering induction temperature in 650~700 C at 1 atm pressure, & holding time variation at 5, 10, 15, and 20 seconds. Kind of tests such as bending test, magna-flux, hardness, and structure micro. Bending test report fiber flow is straight, not broke because not found micro crack portension at body connecting rod. Hardness test result min point 23 HRC and max point 39,2 HRC base on standard range 25~44 HRC. The results of surface morphological observation show that the martensite phase causes hardness value to increase.

Pengaruh Woven Angle dan Proses Penekanan terhadap Tegangan Tarik pada Natural Fiber Laminate Composite Anam, Khairul; Purnowidodo, Anindito; Setyabudi, Sofyan Arif
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

The aim of this study is to investigate the effects of pressure and woven angle on the tensile strength of natural fiber laminate composite. Pandanus tectorius and polymethyl methacrylate (PMMA) was used as natural fiber and matrix, respectively. The epoxy adhesive joint is used to connect between natural fiber and matrix. The pressure time of 10 s,15 s, 30 s and the pressure of 20 N/mm2, 40 N/mm2, 60 N/mm2 were used in this study. In addition, the angle of the 0o / 90o and 45o / 45o woven angle is used as the initial reference for fiber orientation before pressure is applied. From the results of the study, it can be concluded that the addition of a pressure of 60 N / mm2 and pressure time of 30 s has the highest tensile strength both at the angle of 0o / 90o and 45o / 45o. However, the tensile strength at the angle of 0o / 90o is higher that 45o / 45o. In addition, the number of adhesives decreased with increasing the pressure which will lead to delaminating.

Kinematic and Singularity Analysis of PRoM-120 â€“ A Parallel Robotic Manipulator with 2-PRU/PRS Kinematic Chains Adriyan, Adriyan; Sufiyanto, Sufiyanto
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

PRoM-120 was a parallel robotic manipulator which constructed by 2-PRU/PRS kinematic chains. The mobility of this manipulator was 3 DOF, i.e. 1 translational DOF, and 2 rotational DOF (1T2R). The objective of this research was to analyze kinematic, and singularity of PRoM-120 based on its geometrical configuration. Inverse kinematics and velocity analysis were carried out by applying loop vector equation. Meanwhile, all screw systems existed in PRoM-120 were derived using screw theory. Singularity analysis revealed that PRoM-120 had no constraint singularity within its workspace. The kinematic singularity of PRoM-120 showed similar condition to transmission singularity. Three types of both singularities were examined and presented for general condition and selected numerical value of kinematic constants having by PRoM-120. The selected numerical values of those kinematic constants showed only one pose for the singular condition, which was the direct kinematic or the output transmission singularity.

Pengaruh Fraksi Volume Serat Empulur Sagu (Metroxylon sp) dan Presentase Alkali terhadap Pengujian Impak serta Absorpsi Air pada Komposit Berserat Sagu Nanulaitta, Nevada Mario; Soeprapto, Wahyono; Soenoko, Rudy
Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Human necessities for good material to support daily activity are growing up, especially eco-friendly material.Â Applications such as decoration, interior, until the furniture increased along with the population growth. Sago (Metroxylon sp) as one of the plants and also as one of the staple food in Maluku, this plant thrives in Maluku. To be processed into sago that is ready to eat required the process of extraction of sago tree (Metroxylon sp) trunk that leaves waste sago pith (fiber). In this research the utilization of waste fiber sago pith in use as composite amplifier with matrix is sago starch. Research using natural ingredients as composite maker, is expected to get composite that have good impact strength and good water absorption rate. The composites were made using hand lay up method with variation of volume fraction of sago pith fiber is 30% and 50% with NaOH solution and aquades in alkaline process with percentage comparison of 3%, 5%, 7% and 9% for 120 minutes immersion time. The results of this study found the best impact strength on the composite with a variation of fiber volume of 50% with alkaline process 9% with the highest value on the energy absorbed composite 6,9303 (J) with impact strength 0.0693 (J/mm2). The best water absorption rate is at 8.67% occurring on a 50% fiber fraction variation with a percentage of 9% NaOH alkali process.

Pengaruh Variasi Ukuran Bola Baja pada Proses Dry Shot Peening terhadap Mikrostruktur dan Kekerasan Material Implan AISI 316L Pramudia, Mirza; Romadhon, Ahmad Sahru
Jurnal Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

AISI 316L isÂ a type ofÂ 316 austenitic stainless steelÂ with characteristicÂ very lowÂ carbon content. ThisÂ materialÂ containsÂ several elementsÂ such as molybdenum-chromium-nickel whichÂ are aimed to improve the corrosionÂ and oxidation resistances at high temperature applications.Â The low carbon content and the high level of corrosion resistance of AISI 316L allow this material to be applied to the surgicalÂ implantÂ applications in the human body as well as on the welding applications. Several methods of surface treatment appliedÂ inÂ AISIÂ 316LÂ are aimed to improveÂ the mechanical propertiesÂ andÂ corrosion resistance. DryÂ shotÂ peeningÂ is one of coldÂ deformationÂ processesÂ which is conducted on the material surface to improveÂ the mechanicalÂ strength. The process was performed byÂ firingÂ ballsÂ of steelÂ with particular sizes of 0.5 mm, 1Â mm,Â 2 mm,Â and 3Â mmÂ onÂ specimensÂ with aÂ certain speedÂ that comes fromÂ the pressure ofÂ theÂ air compressor. The results show that parameter of shot angle at the dry shoot peening process has an influence on microstructure and hardness of the AISI 316L austenitic stainless steel. The highestÂ value of hardnessÂ was achievedÂ usingÂ 3 mmÂ diameterÂ of steelÂ ballÂ with the value ofÂ hardness reachedÂ 560Â VHNÂ on metal surfaceÂ then gradually decreased as the depth increased.

Rancang Bangun Solar Dryer untuk Meningkatkan Kualitas Refuse Derived Fuels (RDF) sebagai Bahan Bakar Alternatif di Kiln Burner Industri Semen Maulida Okta Arifianti, Qurrotin Ayunina; Abidin, Muhammad Rizal; Nugrahani, Elita Fidiya; Ummatin, Kuntum Khoiro
Jurnal Rekayasa Mesin Vol 9, No 3 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

To utilize the municipal solid waste (MSW), PT Semen Indonesia has a program to convert waste into three useful products. One of the product is named Refuse Derived Fuel (RDF). The RDF has claimed that it had a caloric value about 5178 kcal/kg. However, currently, RDF could not be used for the combustion process in the cement kiln since RDF has higher moisture content and lower caloric value. In this research, a solar dryer with greenhouse type is designed to reduce the moisture content. The performance is tested using two variations and compared to the conventional method. The variations are a solar dryer with one fan and with no fan. The general results show that variation with one fan has the highest drying rate among all. There is a significant reduction of moisture content after drying process using a solar dryer. The moisture content could be reduced to 16.25 % and 17 % using one fan and no fan, respectively. Furthermore, variation with 1 fan has higher solar dryer efficiency than that of one fan.

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Jawa timur

INDONESIA