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Suprapto A.,University of Merdeka Malang | Iswantoko A.,University of Merdeka Malang | Widyastuti I.,University of Merdeka Malang
International Journal of Applied Engineering Research | Year: 2017

Generally, case hardening and the addition of chemical elements are the alternatives to solve wear metals in order to reduce friction. Nowadays, many industries develop cryogenic treatment to improve wear resistance of ductile iron material to increase wear resistance is. The purpose of this study to evaluate the impact of cryogenic treatment and temper for hardness and wear resistance of Martemper Ductile Iron (MDI). The method used in this study is cryogenic treatment and temper of Martemper Ductile Iron (MDI) by heating in the austenite temperature of 900°C for 30 minutes, then quenching in warm water at the temperature 40°C, 60°C, 80°C with holding time variation 60s, 120s, 180s and cooled at room temperature. Test analysis is conducted by analytical method and hardness test with Rockwell method and wear test. Findings from this research: (1). Hardness of Martemper is 51.33 HRc, 55.33 HRc for Cryogenic Treatment and 56,00 HRc for Temper, showed an increasing of hardness. (2). Result of Cryogenic Treatment indicate an increasing of wear resistance by 83% compare to the results of Martemper. (3). Result of Temper indicate an increasing in wear resistance by 3.5% compare with the results of Cryogenic Treatment. © Research India Publications.


Yuniawan D.,University of Merdeka Malang | Ito T.,Tokushima University | Mohamad E.B.,University Technical Malaysia Melaka
International Journal of Internet Manufacturing and Services | Year: 2014

The objective of this research is to propose an enhancement of the overall equipment effectiveness (OEE) by including information on OEE estimation, value added (VA) cost, and non-value added (NVA) cost through simulation and the Taguchi experimental method. This additional information can enhance the original OEE as a key performance indicator (KPI) and act as a guide for a company in deciding on the priority improvement required. If a company relies solely on the ordinary OEE calculation, it can only arrive at a decision for priority improvement through the lowest score measured and will be in the dark as to the level of improvement required in the production line. Decision-makers in the company need to consider information other than the OEE score if their intention is to see a profound improvement in the performance of the production line. This research proposes a procedure which employs simulation and the Taguchi experimental method. Copyright © 2014 Inderscience Enterprises Ltd.


Purnomo,Brawijaya University | Purnomo,Muhammadiyah University of Semarang | Soenoko R.,Brawijaya University | Irawan Y.S.,Brawijaya University | Suprapto A.,University of Merdeka Malang
International Journal of Applied Engineering Research | Year: 2014

Novel biomaterials from natural zeolite-filled high-density polyethylene (HDPE) have been successfully formed through injection molding techniques at a barrel temperature of 160°C and with a barrel holding time of 2 minutes. Fracture behavior of a quasi-static state was investigated using the method of essential work of fracture (EWF) in a double edge-notched tensile test. The results showed that the fracture behavior depend on the zeolite content mixture. The fracture specific essential work to initiation of composites is lower than original HDPE without any material additions. Increasing the zeolite percentage causes a fracture specific work to crack propagation and energy dissipation during crack propagation decreased. However, the energy dissipation during yielding increases upon the addition of 15 wt.% zeolite and subsequent decline gradually. In a case of adding a 5 wt.% zeolite, fracture occurred in the state of transition to ductile, but the zeolite addition above 5 wt.% resulted a fracture behavior leading to brittle which was characterized by the work to initiate crack higher than the work in the plastic deformation zone. © Research India Publications.


Asiri M.H.,Brawijaya University | Asiri M.H.,Muslim University of Indonesia | Soenoko R.,Brawijaya University | Suprapto A.,University of Merdeka Malang | Irawan Y.S.,Brawijaya University
International Journal of Applied Engineering Research | Year: 2014

Aluminum alloy is the basic raw material to produce powder metallurgy by implementing a device called as water atomization. Aluminum alloy is melted at a temperature of 1300 °C to melt aluminum material. After melt the aluminum alloy is cooled about 15 minutes on the surround air while being cleaned from dirt on the hot liquid material surface thoroughly. Furthermore, the hot liquid material in the kowi is then poured into the atomization tube through a hopper which is then sprayed with water comes out from a twin nozzle with an Ø9 mm diameter nozzle hole. This the granulation process, with a spray pressure about P = 30 psi, a spraying angle variation of: L20°, L30°, and L40° and a constant water rate discharge of (Q) = 15 L/S. The water spraying distance was also varied for the L20°, the spraying distance is taken 2.5 cm; for L30°, the spraying distance was taken 3.5 cm and the spraying distance for the L40 ° is 4.5 cm. From the research, L30 ° with a spraying distance of 3.5 cm may have the best result, with a better metallurgical powder amount and resulted about 295 grams of aluminum powder material. The aluminum weight before melted is about 300 grams. Finally the aluminum powder hardness (HV) was tested; for the L20° process the HV was 55.94 kgm/s2, for the L30° process the HV was 50.07 kgm/s2, and for the L40° process the HV was 45.73 kgm/s2. From the three angle variation observed, the L20° got the highest Vickers Hardness Number. © Research India Publications.


Setyarini P.H.,Brawijaya University | Soenoko R.,Brawijaya University | Suprapto A.,University of Merdeka Malang | Irawan Y.S.,Brawijaya University
International Review of Mechanical Engineering | Year: 2016

This paper was intended to figure out the corrosion resistance and surface morphology of AA6061 that is anodized with 1M phosphoric acid and cathode titanium in several potential variations. The surface morphology was examined by scanning electron microscopy (SEM), the surface roughness was investigated by Portable Surface Roughness Tester and finally the corrosion resistance was analyzed by the electrochemical impedance spectroscopy (EIS). The surface morphology showed that an increased potential of electricity supplied during the anodizing process leads to enlarged pore size larger or equitable to that occuring on the surface of the specimen, leading to decreased surface roughness values. Surface roughness tests indicated the lowest roughness values achieved from the anodizing with 30V potential was 0.674 μm. From the data, XRD showed the most significant influence on the process of anodizing, visible from the top of the resulting diffraction. As the potential increases, the intensity will decrease while the plane increases. The examination of corrosion resistance with EIS showed that the first step in the process of anodizing is an increase of Relp associated with an increased area coated by a layer of oxide. © 2016 Praise Worthy Prize S.r.l. - All rights reserved.


Soenoko R.,Brawijaya University | Irawan Y.S.,Brawijaya University | Suprapto A.,University of Merdeka Malang
International Journal of Applied Engineering Research | Year: 2015

This study focused on the morphology and mechanical properties of novel implant skull reconstruction from the natural zeolite-high density polyethylene (HDPE). The composites were formed through injection molding techniques. Scanning electron microscopy (SEM) was used to investigate the morphology of composites. The composite morphology showed the present of aggregate. An increase in the content of the particles resulted in lower the inter-particle distance. Ductility and yield stress decreased with increasing content of zeolite. On the other hand, Young's modulus increased in line with the increasing zeolite content. Tensile stress increased with addition of zeolite content of 5 wt.% and decreased in further additions. This indicated that the highest adhesion strength of the interface occurs at a concentration of 5 wt.% zeolite. Therefore, the mechanism of stress transfer from the matrix to the filler occurs effectively. © Research India Publications.


Asiri M.H.,Brawijaya University | Asiri M.H.,Muslim University of Indonesia | Soenoko R.,Brawijaya University | Suprapto A.,University of Merdeka Malang | Irawan Y.S.,Brawijaya University
International Journal of Applied Engineering Research | Year: 2014

Aluminum alloy is the base material to produce aluminum metal powders by using a water atomization system with a spraying method under a high pressure condition of about 30 to 40 psi. The water spraying discharge was set as Q = 20 l/s with a spraying angle variation of 20°, 30° and 40° and by implementing a 20 holed nozzle. Each nozzle hole has a diameter of Øhole = 1mm. The aim of setting these parameters is to get a fine and bulky aluminum alloy powder. The other objective is that a fine grain powder could have a better structure and hopefully can avoid porosity as well as improve the aluminum alloy mechanical properties, such as the metal hardness, metal tensile strength, metal ductility and of course a normal micro and macro structure. Furthermore, to determine the metal powder granules form and size it is depend on the spraying distance parameters variation. The spraying parameter variations are the nozzle spraying distance to the hot liquid metal and the nozzle angle toward the hot liquid metal stream (θ). In this research the parameter variations are 2.5 cm spraying distance for the 20° spraying angle, a 3.5 cm spraying distance for the 30° spraying angle and a 4.5 cm spraying distance for the 40° spraying angle. The spray angle variation would give a special powder shape characteristic. Moreover, the spray distance could give a specific powder number produced. From the three kind of spray angle variation the highest metal powder number produced occurs at a spray angle of 30°, with a 3.5 cm spray distance a 297 grams of metal powder was produced. With a 20 holes nozzle and a nozzle hole diameter of Ø = 1 mm and a pressure of = 15 psi, and water flow rate of 15 l/s. © Research India Publications.


Suprapto A.,University of Merdeka Malang | Iswantoko A.,University of Merdeka Malang | Widyastuti I.,University of Merdeka Malang
International Journal of Applied Engineering Research | Year: 2016

Nowadays, there are many industries develop the using of cryogenic treatment to improve wear resistance of cutting tool. Target of the research is to evaluate impact of cryogenic treatment method to wear resistance characteristic of ADI (Austemper Ductile Iron) cutting tools. ADI cutting tools of cryogenic treatment implemented for turning process of aluminium alloy material T-6061with cutting depth (a) variation 0. 1mm; 0. 5mm; and 1mm, while cutting speed (Vc) 70 m/min and constant feeding motion (f) 0. 1 mm/rotation without coolant. Analysis of this experiment uses analytic method and microscope digital observation. The finding of experiment are (1) BUE (Built Up Edge)deposit of Al material on untreated ADI cutting tool be thicker with increase of cutting depth (a). (2) BUE deposit of Al material be thinner on cryogenic treatment ADI cutting tool with increase of soaking time. (3) Wear on rake surface be worse with increase of cutting depth (a). (4) ADI cutting tool as a result of cryogenic treatment with soaking time for 48 hours, cutting speed (Vc) 70 m/min, feed motion (f) 0. 1 mm/rotation and cutting depth (a) 1mm, show the wearing of cutting tool edge decrease until 77% compare than cutting tool without cryogenic treatment. (5) Wearing of cutting tool edge be smaller with increase of soaking time on cryogenic treatment process so wear resistance be higher. © Research India Publications.


Suprapto A.,University of Merdeka Malang | Iswantoko A.,University of Merdeka Malang | Widyastuti I.,University of Merdeka Malang
International Journal of Applied Engineering Research | Year: 2014

Generally to overcome the problem of cutting tool wear use coolant on metal cutting process for decrease the friction or use coating for cutting tool. Nowadays many industry develop the using of cryogenic treatment to improve wear resistance of cutting tool, for carbide toollifelonger. Target of this research is to evaluate impact of cryogenic treatment and temper to carbide toollife. Method in this research use cryogenic treatment process continued with temper process ofcarbide tool. Carbide cutting tool as result of this process implementedon turning process for Aluminiumalloy T-6061 with cutting depth (a) variation are 0,1 mm; 0,5mm and 1 mm, while cutting speed (Vc) 70 m/minute and constant feeding motion (f) 0,1 mm/rotation, without coolant. Research analyst use analytical method and perception with digital microscope and hardness test with Rockwell. The research result are:1. The greater of cutting depth(a), then wear of cutting tool edge (Vb) be greater, and tool life (T) be shorter.2. Result of cryogenic treatment for 48 hoursat cutting depth(a) 1mm, cutting speed(Vc) 70 m/minute and feeding motion (f) 0,1 mm/rotation, the toollifeincrease 28%. At the same condition with cryogenic treatment for 48 hoursand temper at 150ºC for 1 hour the toollife increase to 105%. 3. For the cryogenic treatment at cutting depth(a) 1mm the Taylor equation of tool lifeVT0,35 = 103,6707 and for the cryogenic treatment and temper at the same cutting depth condition the Taylor equation of tool life VT0,2 = 95,06642. © Research India Publications.


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Post on : 02-06-2014 03:37:27 KembaliPiagam Pengahargaan MUSEUM REKOR INDONESIA dianugrahkan kepada Lembaga Penelitian dan Pengabdian Kepada Msyarakat Universitas Merdeka Malang atas Rekor Pemrakarsa MOU antara Walikota dengan Perguruan Tinggi Terbanyak, 32 PTN/PTS yang di berikan saat acara Talk Show dan Seminar Nasional Kebersamaan PEMDA, Perguruan Tinggi, Perbankan dan Yayasan Damandiri serta Peran Posdaya dalam Program Penanggulangan Kemiskinan yang dilaksanakan di Gedung Balai Merdeka Universitas Merdeka Malang pada hari Senin, 26 Mei 2014. Dalam acara ini tidak hanya diisi dengan penyerahan Piagam Pengahargaan MUSEUM REKOR INDONESIA saja tapi Talkshow dan Seminar Nasional yang di hadiri oleh beberapa tokoh besar yang sekaligus menjadi pembicara pada kegaitan ini, Sekretaris Daerah Kota Malang Dr ...

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