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Malang, Indonesia

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. Source


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. Source


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. Source


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. Source


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. Source

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